Sliding window mechanism I

Abstract

This invention pertains to mechanisms for opening and closing sliding windows especially in homes and buildings. A sliding window comprises a pane which is installed in a sliding frame. The frame is sliding vertically or horizontally within a static outer frame which has two parallel guides that guide the sliding frame. There are three similar approaches for such a mechanism: a two cables mechanism, a single roller chain mechanism and a two roller chains mechanism. The two cable approach uses four pulleys and two flexible cables. The single roller chain approach employs two sprockets. The two roller chains approach uses four sprockets. The window can be operated manually or by using an electric motor. The window assembly includes two safety systems which protect persons from being caught by a closing window. The window assembly also includes a burglar alarm and does not require a latch for window locking.

Claims

1. A two cables mechanism configured for opening and closing a sliding window comprising: an outer frame, a sliding window, a lower two track pulley, an upper two track pulley, a lower single track pulley, an upper single track pulley, a left cable made of elastic material, a right cable made of elastic material and a crank; said sliding window comprising: a sliding frame and a pane; wherein said pane is made of transparent material; wherein said pane is framed in said sliding frame; wherein said sliding frame comprising: a lower left corner, an upper left corner, a lower right corner and an upper right corner; said outer frame comprises two vertical parallel guides, a lower outer horizontal bar and an upper outer horizontal bar; wherein said vertical parallel guides are configured to guide said sliding frame in sliding up and down within said outer frame; said outer frame comprising a lower left outer corner, an upper left outer corner, a lower right outer corner and an upper right outer corner; said lower two track pulley is installed at said lower left outer corner; said upper two track pulley is installed at said upper left outer corner; said lower single track pulley is installed at said lower right outer corner; said upper single track pulley is installed at said upper right outer corner; wherein said lower two track pulley comprising: a first lower track and a second lower track; wherein said upper two track pulley comprising: a first upper track and a second upper track; said left cable comprising an upper left end and a lower left end; wherein said lower left end is attached to said lower left corner; wherein said upper left end is attached to said upper left corner; wherein said left cable is strung downwards starting from said lower left end and is wound around said first lower track; next, said left cable is strung upwards and is wound around said first upper track; next, said left cable is strung downwards and ends at said upper left end, which is attached to said upper left corner; said right cable comprising an upper right end and a lower right end; wherein said lower right end is attached to said lower right corner; said upper right end is attached to said upper right corner; wherein said right cable is strung downwards starting from said lower right end and is wound around said lower single track pulley; next, said right cable is strung leftwards and is wound around said second lower track; next, said right cable is strung upwards and is wound around said second upper track; next, said right cable is strung rightwards and is wound around said upper single track pulley; next, said right cable is strung downwards and ends at upper right end, which is attached to said upper right corner; said crank is mechanically connected to said lower two track pulley and is configured to facilitate manual turning of said lower two track pulley; wherein, turning in clockwise direction said lower two track pulley facilitates said left cable pulling down said lower left corner while releasing said upper left corner; wherein, turning in clockwise direction said lower two track pulley facilitates said right cable pulling down said lower right corner while releasing said upper right corner; wherein, turning in counterclockwise direction said lower two track pulley facilitates said left cable pulling up said upper left corner while releasing said lower left corner; wherein, turning in counterclockwise direction said lower two track pulley facilitates said right cable pulling up said upper right corner while releasing said lower right corner; wherein, said two cables mechanism is configured to move downwards said sliding window by turning said crank in clockwise direction and said two cables mechanism is configured to move upwards said sliding window by turning said crank in counterclockwise direction.

2. The two cables mechanism of claim 1, comprising a gearbox, which is connected to an input gearbox axis and an output gearbox axis; wherein said crank is connected to said input gearbox axis; wherein said output gearbox axis is connected to said lower two track pulley; wherein said crank is configured to manually turn said input gearbox axis; wherein output gearbox axis is configured to turn said lower two track pulley; wherein said gearbox is configured to convert a turning speed of said input gearbox axis into a lower turning speed of said output gearbox axis by a predetermined ratio.

3. The two cables mechanism of claim 2, comprising: an electrical motor and a control unit; wherein said crank is replaced by the electrical motor, which is mechanically connected to said input gearbox axis; wherein said electrical motor is electrically connected to said control unit; wherein said control unit controls a direction of said electrical motor and a speed of said electrical motor; wherein said control unit is electrically connected to a control box by which a user can control the direction of said electrical motor and the speed of said electrical motor; wherein, said electrical motor is configured to move said sliding window up or down by turning said lower two track pulley in clockwise direction or in counterclockwise direction respectively.

4. The two cables mechanism of claim 3, comprising: a lower limit switch and an upper limit switch; wherein said lower limit switch is configured to be activated when said sliding frame reaches a lowest position within said outer frame; wherein said upper limit switch is configured to be activated when said sliding frame reaches a highest position within said outer frame; wherein said lower limit switch and said upper limit switch are electrically connected to said control unit; wherein said control unit is configured to stop said electrical motor when said lower limit switch or said upper limit switch is activated.

5. The two cables mechanism of claim 4, further comprising: a burglar alarm electrically connected to said control unit; wherein said lower limit switch is configured to activate said burglar alarm when said lower limit switch is deactivated and said burglar alarm is armed.

6. The two cables mechanism of claim 3, comprising: a safety switch and a safety bar; wherein safety switch is electrically connected to said control unit; wherein said safety switch is installed on top of said lower outer horizontal bar; wherein said safety bar is installed on top of said safety switch; wherein, said safety bar is configured to activate said safety switch when pressured; wherein, said control unit is configured to control the direction of said electrical motor when said safety switch is activated; whereby, said sliding window is moved upwards when said safety bar is pressurized.

7. The two cables mechanism of claim 3, further comprising: an overload sensor electrically connected to said control unit; wherein said control unit is configured to reverse the direction of said electrical motor when said overload sensor senses a sudden overload of said electrical motor due to a blocking of said sliding window's motion.

8. The two cables mechanism of claim 1, wherein said left cable is wound around said first lower track at least once; wherein said right cable is wound around said second lower track at least once.

9. The two cables mechanism of claim 1, comprising: an upper spring with an upper spring bias, a lower spring with a lower spring bias and a left spring with a left spring bias; wherein said upper spring is connecting two segments of said right cable strung between said second upper track and said upper single track pulley; wherein said lower spring is connecting two segments of said right cable strung between said second lower track and said lower single track pulley; wherein said left spring is connecting two segments of said left cable strung between said first lower track and said first upper track; wherein said left spring bias preserves a predetermined tension level of said left cable; wherein said upper spring's bias and said lower spring's bias preserve a predetermined tension level of said right cable.

10. The two cables mechanism of claim 1, further comprising a lower left roller, an upper left roller, a lower right roller and an upper right roller; wherein said lower left roller is installed at said lower left corner, said upper left roller is installed at said upper left corner, said lower right roller is installed at said lower right corner and said upper right roller is installed at said upper right corner; wherein said lower left roller, said upper left roller, said lower right roller and said upper right roller facilitate sliding up and down of said sliding frame within said outer frame.

11. A two chains mechanism for opening and closing a sliding window comprising: an outer frame, a sliding window, a lower two track sprocket, an upper two track sprocket, a lower single track sprocket, an upper single track sprocket, a left roller chain, a right roller chain and a crank; said sliding window comprising: a sliding frame and a pane; wherein said pane is made of transparent material; wherein said pane is framed in said sliding frame; wherein said sliding frame comprising: a lower left corner, an upper left corner, a lower right corner and an upper right corner; said outer frame comprises two vertical parallel guides, a lower outer horizontal bar and an upper outer horizontal bar; wherein said vertical parallel guides are configured to guide said sliding frame in sliding up and down within said outer frame; said outer frame comprising a lower left outer corner, an upper left outer corner, a lower right outer corner and an upper right outer corner; said lower two track sprocket is installed at said lower left outer corner; said upper two track sprocket is installed at said upper left outer corner; said lower single track sprocket is installed at said lower right outer corner; said upper single track sprocket is installed at said upper right outer corner; wherein said lower two track sprocket comprising: a first lower track and a second lower track; wherein said upper two track sprocket comprising: a first upper track and a second upper track; said left roller chain comprising an upper left end and a lower left end; wherein said lower left end is attached to said lower left corner; wherein said upper left end is attached to said upper left corner; wherein said left roller chain is strung downwards starting from said lower left end and is wound around said first lower track; next, said left roller chain is strung upwards and is wound around said first upper track; next, said left roller chain is strung downwards and ends at said upper left end, which is attached to said upper left corner; said right roller chain comprising an upper right end and a lower right end; wherein said lower right end is attached to said lower right corner; said upper right end is attached to said upper right corner; wherein said right roller chain is strung downwards starting from said lower right end and is wound around said lower single track sprocket; next, said right roller chain is strung leftwards and is wound around said second lower track; next, said right roller chain is strung upwards and is wound around said second upper track; next, said right roller chain is strung rightwards and is wound around said upper single track sprocket; next, said right roller chain is strung downwards and ends at upper right end, which is attached to said upper right corner; said crank is mechanically connected to said lower two track sprocket and is configured to facilitate manual turning of said lower two track sprocket; wherein, turning in clockwise direction said lower two track sprocket facilitates said left roller chain pulling down said lower left corner while releasing said upper left corner; wherein, turning in clockwise direction said lower two track sprocket facilitates said right roller chain pulling down said lower right corner while releasing said upper right corner; wherein, turning in counterclockwise direction said lower two track sprocket facilitates said left roller chain pulling up said upper left corner while releasing said lower left corner; wherein, turning in counterclockwise direction said lower two track sprocket facilitates said right roller chain pulling up said upper right corner while releasing said lower right corner; wherein, said two chains mechanism is configured to move said sliding window downwards by turning said crank in clockwise direction and said two chains mechanism is configured to move said sliding window upwards by turning said crank in counterclockwise direction.

12. The two chains mechanism of claim 11, comprising a gearbox which is connected to an input gearbox axis and to an output gearbox axis; wherein said crank is connected to said input gearbox axis; wherein said output gearbox axis is connected to said lower two track sprocket; wherein said crank is configured to manually turn said input gearbox axis; wherein said output gearbox axis is configured to turn said lower two track sprocket; wherein said gearbox is configured to convert a turning speed of said input gearbox axis into a lower turning speed of said output gearbox axis by a predetermined ratio.

13. The two chains mechanism of claim 12, comprising: an electrical motor and a control unit; wherein said crank is replaced by the electrical motor, which is mechanically connected to said input gearbox axis; wherein said electrical motor is electrically connected to said control unit; wherein said control unit controls a direction of said electrical motor and a speed of said electrical motor; wherein said control unit is electrically connected to a control box by which a user can control the direction of said electrical motor and the speed of said electrical motor; wherein, said electrical motor is configured to move said sliding window up or down by turning said lower two track sprocket in clockwise direction or in counterclockwise direction respectively.

14. The two chains mechanism of claim 13, comprising: a lower limit switch and an upper limit switch; wherein said lower limit switch is configured to be activated when said sliding frame reaches a lowest position within said outer frame; wherein said upper limit switch is configured to be activated when said sliding frame reaches a highest position within said outer frame; wherein said lower limit switch and said upper limit switch are electrically connected to said control unit; said control unit is configured to stop said electrical motor when either said lower limit switch or said upper limit switch is activated.

15. The two chains mechanism of claim 14, further comprising: a burglar alarm electrically connected to said control unit; wherein said lower limit switch is configured to activate said burglar alarm when said lower limit switch is deactivated and said burglar alarm is armed.

16. The two chains mechanism of claim 13, comprising: a safety switch and a safety bar; wherein safety switch is electrically connected to said control unit; wherein said safety switch is installed on top of said lower outer horizontal bar; wherein said safety bar is installed on top of said safety switch; wherein, said safety bar is configured to activate said safety switch when pressured; wherein said control unit is configured to control the direction of said electrical motor when said safety switch is activated; wherein, said sliding window is moved upwards when said safety switch is pressurized.

17. The two chains mechanism of claim 13, further comprising: an overload sensor electrically connected to said control unit; wherein said control unit is configured to reverse the direction of said electrical motor when said overload sensor senses a sudden overload of said electrical motor due to a blocking of said sliding window.

18. The two chains mechanism of claim 11, further comprising: a lower left roller, an upper left roller, a lower right roller and an upper right roller; wherein said lower left roller is installed at said lower left corner, said upper left roller is installed at said upper left corner, said lower right roller is installed at said lower right corner and said upper right roller is installed at said upper right corner; wherein said lower left roller, said upper left roller, said lower right roller and said upper right roller facilitate sliding up and down of said sliding frame within said outer frame.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 describes in a blow-up isometric drawing the moving parts of the two cables mechanism. This includes the four sprockets, the left and right cables, a crank, a gearbox and the sliding frame. The lower left pulley also has a crank for manual operation. FIG. 4 is identical to FIG. 1 except for the replacement of the crank with an electrical motor which enables motorized opening and closing.

(2) FIGS. 2A, 2B, 2C illustrate the frontal, side and top views respectively of the two cables mechanism. The frontal and the side views are cross sections. FIGS. 5A, 5B, 5C are identical to FIGS. 2A, 2B, 2C except for the replacement of the crank with an electrical motor which enables motorized opening and closing.

(3) FIGS. 3A, 3B, 3C show the frontal, side and top views respectively of the single roller chain mechanism sliding window mechanism. FIGS. 6A, 6B, 6C are identical to FIGS. 3A, 3B, 3C except for the replacement of the crank with an electrical motor which enables motorized opening and closing.

(4) FIG. 7 describes the control unit which controls the electrical motor's direction and speed. The control unit is connected to limit and safety switches, to the electrical motor and to the burglar alarm.

(5) FIG. 8 illustrates the single roller chain mechanism with manual operation in a blow-up isometric drawing.

(6) FIG. 9 describes in a blow-up isometric drawing the moving parts of the single roller chain mechanism with motorized operation.

(7) FIG. 10 depicts the structure and components of the roller chain and the sprocket wheel.

(8) FIG. 11 describes in a blow-up isometric drawing the moving parts of the two chains mechanism with manual operation.

(9) FIG. 12 describes in a blow-up isometric drawing the moving parts of the two chains mechanism with motorized operation.

DETAILED DESCRIPTION OF THE DRAWINGS

(10) FIG. 1 describes in isometric drawing the moving parts of the two cables mechanism. This includes the four pulleys: 1A, 2A, 3A and 4A, the left cable: 6A-6B-6C and the right cable 7A-7B-7C and the sliding frame four corners: 5A-5B-5C-5D. Pulley 1A is the lower two track pulley installed at the lower left outer corner of the outer frame. Pulley 2A is the upper two track pulley installed at the upper left outer corner of the outer frame. Pulley 4A is the lower single track pulley installed at the lower right outer corner of the outer frame. Pulley 3A is the upper single track pulley installed at the upper right outer corner of the outer frame. The left cable has an upper left end 6C and a lower left end 6B. Where the lower left end 6B is attached to the lower left corner 5A of the sliding frame. The upper left end 6C is attached to the upper left corner 5B. The left cable 6A is strung downwards starting from the lower left corner 5A and is wound around the first lower track 1B of the lower two track pulley 1A. Next the left cable is strung upwards and is wound around the first upper track 2B of the upper two track pulley 2A. Next, the left cable is strung downwards and ends at the upper left end 6C, which is attached to the upper left corner 5B.

(11) The right cable comprising an upper right end 7C and a lower right end 7B. Where the lower right end 7B is attached to the lower right corner 5D. The upper right end 7C is attached to the upper right corner 5C. The right cable 7A is strung downwards starting from the lower right end 7B and is wound around the lower single track pulley 4A. Next, the right cable 7A is strung leftwards and is wound around the second lower track 1C of the lower two track pulley 1A. Next, the right cable is strung upwards and is wound around the second upper track 2C of the upper two track pulley 2A. Next, the right cable 7A is strung rightwards and is wound around the upper single track pulley 3A. Next, the right cable is strung downwards and ends at upper right end 7C, which is attached to the upper right corner 5C of the sliding frame.

(12) The lower two track pulley 1A also has a crank 1D for manual operation. The crank 1D is installed on the input gearbox axis 1H of the gearbox 1G which is connected by the output gearbox axis 1E to the lower two track pulley 1A. When the pulley 1A is turned incrementally in clockwise direction, the left hand side of the cables 6A (left cable) and 7A (right cable) are moved upwards by the same distance increment: dx. As a result the lower ends of the cables 6A and 7A which are denoted by 6B and 7B correspondingly (lower left end and lower right end) move downwards by dx and pull downwards also by dx the corresponding sliding frame corners 5A (denoted by: lower left corner) and 5D (denoted by: lower right corner). At the same time, the corresponding upper cable ends 6C and 7C also move downwards by dx and allow their correspondingly attached sliding frame corners 5B (upper left corner) and 5C (upper right corner) to move downwards by the same distance increment dx. As a consequence, the whole sliding frame is moved downwards by dx. Thus, by turning the lower two track pulley 1A in clockwise direction the sliding frame can be moved downwards as much as needed within the range of the outer frame.

(13) On the other hand, when the lower two track pulley 1A is turned incrementally in counterclockwise direction, the left hand sides of the left and right cables 6A and 7A are moved downwards by the same distance increment: dy. As a result the lower ends of the left and right cables 6A and 7A which are denoted by 6B and 7B correspondingly, move upwards by dy and allow the corresponding sliding frame lower left and lower right corners 5A and 5D to move upwards by dy. At the same time, the corresponding upper left and right cable ends 6C and 7C also move upwards by dy and pull upwards their correspondingly attached sliding frame upper left and upper right corners 5B and 5C by the same distance increment dy. As a consequence, the sliding frame is moved upwards by dy. Thus, by turning the lower two track pulley 1A in counterclockwise direction the sliding frame can be moved upwards as much as needed within the outer frame's range.

(14) Additional features displayed in FIG. 1 are the two tracks of the lower two track pulley 1A i.e. the first lower track 1B and the second lower track 1C. Similarly the two tracks of the upper two track pulley 2A are the first upper track 2B and the second upper track 2C. The two cables mechanism is equipped also with an upper limit switch 3F and a lower limit switch 4F and with a lower spring 7D and an upper spring 7E for preserving the tension levels of the right cable and the left spring 6D for preserving the tension level of the left cable.

(15) FIGS. 2A, 2B, 2C show 3 views of the sliding window two cables mechanism. FIGS. 5A, 5B, 5C are identical to FIGS. 2A, 2B, 2C except for the replacement of the crank 1D with the electrical motor 1F. The frontal and the side views are in cross sections. As can be observed in FIG. 2A, the pane 8 is framed by the sliding frame which has four corners: 5A, 5B, 5C, 5D. The sliding frame is guided by two parallel, vertical guides 9B which are at the inner side of the vertical bars of the outer frame 9A. The rollers 5E, 5F, 5G, 5H are installed at recesses near the corresponding sliding frame corners: 5A, 5B, 5C, 5D. The two track pulleys 1A and 2A are installed at the lower left corner and the upper left corner of the outer frame 9A. The single track pulleys 4A and 3A are installed at the lower right corner and the upper right corner of the outer frame 9A. As seen in FIG. 1, the left and right cables 6A and 7A are wound around the corresponding first lower track 1B and in second lower track 1C of the lower two track sprocket 1A. The left cable 6A and the right cable 7A could be wound more than once in order to increase the friction between the cables and the sprocket 1A. Next, cables 6A and 7A are strung upwards and wound around the corresponding first upper track 2B and second upper track 2C of upper two track pulley 2A. The single track pulleys: upper single track pulley 3A and lower single track pulley 4A are installed at the corresponding upper right and the lower right corners of the outer frame 9A. The four pulleys 1A, 2A, 3A and 4A rotate around the axles 1E, 2E, 3E and 4E correspondingly which are installed in the outer frame 9A. Pulley 1A has a crank 1D which is installed on the input gearbox axis 1H. The gearbox has an output gearbox axis 1E (shown in FIG. 1) which is connected to the axis 1E and enables manual turning of the lower two track pulley 1A which drives the whole sliding window mechanism. As illustrated in FIGS. 4 and 5, the crank 1D is replaced by an electrical motor 1F to provide motorized opening and closing of the two cable sliding window mechanism.

(16) FIGS. 3A, 3B, 3C describe three views of the single roller chain sliding window mechanism. FIGS. 6A, 6B, 6C are identical to FIGS. 3A, 3B, 3C except for the replacement of the crank 11D with the electrical motor 11F and the addition of the safety system 19C (safety switch) and 19D (safety bar). The single roller chain sliding window mechanism includes the two single track sprockets: 11A and 12A the roller chain: 17A and the sliding frame with 4 corners: 15A-15B-15C-150. The lower left sprocket 11A is installed at the lower left outer corner of the outer frame 19A. The upper left sprocket 12A is installed at the upper left outer corner of the outer frame 19A. The rolling chain 17A has an upper end and a lower end. Where the lower end is attached to the lower left corner 15A and the upper end of the rolling chain is attached to the upper left 15B corner of the sliding frame. The rolling chain is strung downwards starting from the lower left 15A corner and is wound around the lower left sprocket 11A. Next, the rolling chain 17A is strung upwards and is wound around the upper left sprocket 12A. Next the rolling chain 17A is strung downwards and ends at the upper left 15B corner.

(17) The lower left sprocket 11A also has a crank 110 for manual operation. The crank 110 is installed on the input gearbox axis 11H of the gearbox 11G which is connected by the output axis 11E to the lower left sprocket 11A. When the sprocket 11A is turned incrementally in clockwise direction, the left side of the rolling chain section 17A is moved upwards by a distance increment: dz. As a result the lower end of the rolling chain 17A moves downwards by dz and pull downwards also by dz the sliding frame lower left corner 15A. At the same time, the corresponding upper cable section 17A also moves downwards by dz and allows its attached sliding frame upper left corner 15B to move downwards by the same distance increment dz. As a consequence, the whole sliding frame is moved downwards by dz. Thus, by turning the sprocket 11A in clockwise direction the sliding frame can be moved downwards as much as needed within the range allowed by the outer frame. As illustrated in FIG. 6, the crank 110 is replaced by an electrical motor 11F to provide motorized opening and closing of the two cable sliding window mechanism.

(18) On the other hand, when the sprocket 11A is turned incrementally in counterclockwise direction, the left side of the cable 17A is moved downwards by the distance increment: dw. As a result the lower end of the rolling chain 17C moves upwards by dw and allows the sliding frame lower left corner 15A to move upwards by dw. At the same time, the upper end 17G of the rolling chain 17A also moves upwards by dw and pull upwards its attached sliding frame upper left corner 15B by the same distance increment dw. As a consequence, the whole sliding frame is moved upwards by dw. Thus, by turning the sprocket 11A in counterclockwise direction the whole sliding frame can be moved upwards as much as needed within the range allowed by the outer frame.

(19) FIGS. 3A, 3B, 3C show three views of the sliding window single rolling chain mechanism. As can be observed in FIG. 3A, the pane 18 is framed by the sliding frame which has four corners: 15A, 15B, 15C, 15D. The sliding frame is guided by two parallel, vertical guides 19B which are at the inner side of the vertical bars of the outer frame 19A. The rollers 5E, 5F, 5G, 5H are installed at recesses near the corresponding sliding frame corners: 5A, 5B, 5C, 5D. The single track sprockets: lower left sprocket 11A and upper left sprocket 12A are installed at the lower left corner and the upper left corner of the outer frame 19A respectively. Rolling chain 17A is also wound around sprockets: 12A, The lower left sprocket 11A also has a crank 11D for manual operation. The crank 110 is installed on the input gearbox axis 11H of the gearbox 11G which is connected by the output axis 11E to the lower left sprocket 11A. The left spring 17D is preloaded and keeps the tension level of the rolling chain 17A.

(20) FIG. 4 describes in isometric drawing the moving parts of the two cables mechanism. This includes the four pulleys: 1A, 2A, 3A and 4A, the left cable: 6A-6B-6C and the right cable 7A-7B-7C and the sliding frame four corners: 5A-5B-5C-5D. Pulley 1A is the lower two track pulley installed at the lower left outer corner of the outer frame. Pulley 2A is the upper two track pulley installed at the upper left outer corner of the outer frame. Pulley 4A is the lower single track pulley installed at the lower right outer corner of the outer frame. Pulley 3A is the upper two track pulley installed at the upper right outer corner of the outer frame. The left cable has an upper left end 6C and a lower left end 6B. Where the lower left end is attached to the lower left corner 5A of the sliding frame. The upper left end 6C is attached to the upper left corner 5B. The left cable 6A is strung downwards starting from the lower left corner 5A and is wound around the first lower track 1B of the lower two track pulley 1A. Next the left cable is strung upwards and is wound around the first upper track 2B of the upper two track pulley 2A. Next, the left cable is strung downwards and ends at the upper left end 6C, which is attached to the upper left corner 5B.

(21) The right cable comprising an upper right end 7C and a lower right end 7B. Where the lower right end 7B is attached to the lower right corner 5D. The upper right end 7C is attached to the upper right corner 5C.

(22) The right cable 7A is strung downwards starting from the lower right end 7B and is wound around the lower single track pulley 4A. Next, the right cable 7A is strung leftwards and is wound around the second lower track 1C of the lower two track pulley 1A. Next, the right cable is strung upwards and is wound around the second upper track 2C of the upper two track pulley 2A. Next, the right cable 7A is strung rightwards and is wound around the upper single track pulley 3A. Next, the right cable is strung downwards and ends at upper right end 7C, which is attached to the upper right corner 5C of the sliding frame.

(23) The lower two track pulley 1A also is connected to an electrical motor 1F. The electrical motor 1F is connected to the input gearbox axis 1H of the gearbox 1G which is connected by the output gearbox axis 1E to the lower two track pulley 1A. When the pulley 1A is turned incrementally in clockwise direction, the left hand side of the cables 6A (left cable) and 7A (right cable) is moved upwards by the same distance increment: dx. As a result the lower ends of the cables 6A and 7A which are denoted by 6B and 7B correspondingly (lower left end and lower right end) move downwards by dx and pull downwards also by dx the corresponding sliding frame corners 5A (denoted by: lower left corner) and 5D (denoted by: lower right corner). At the same time, the corresponding upper cable ends 6C and 7C also move downwards by dx and allow their correspondingly attached sliding frame corners 5B (upper left corner) and 5C (upper right corner) to move downwards by the same distance increment dx. As a consequence, the whole sliding frame is moved downwards by dx. Thus, by turning the lower two track pulley 1A in clockwise direction the sliding frame can be moved downwards as much as needed within the range of the outer frame.

(24) On the other hand, when the lower two track pulley 1A is turned incrementally in counterclockwise direction, the left hand sides of the left and right cables 6A and 7A are moved downwards by the same distance increment: dy. As a result the lower ends of the left and right cables 6A and 7A which are denoted by 6B and 7B correspondingly, move upwards by dy and allow the corresponding sliding frame lower left and lower right corners 5A and 5D to move upwards by dy. At the same time, the corresponding upper left and right cable ends 6C and 7C also move upwards by dy and pull upwards their correspondingly attached sliding frame upper left and upper right corners 5B and 5C by the same distance increment dy. As a consequence, the sliding frame is moved upwards by dy. Thus, by turning the lower two track pulley 1A in counterclockwise direction the sliding frame can be moved upwards as much as needed within the range of the outer frame.

(25) Additional features displayed in FIG. 4 are the two tracks of the lower two track pulley 1A i.e. the first lower track 1B and the second lower track 1C. Similarly the two tracks of the upper two track pulley 2A are the first upper track 2B and the second upper track 2C. The two cables mechanism is equipped also with an upper limit switch 3F and a lower limit switch 4F and with a lower spring 7D and an upper spring 7E for preserving the tension level of the right cable and the left spring 6D for preserving the tension level of the left cable. The upper limit switch 3F is activated when the sliding frame presses on its lever. Thus the upper limit switch 3F is configured to stop the electrical motor 1F when the sliding frame reaches its highest position. The lower limit switch 4F is activated when the sliding frame presses on its lever. Thus the lower limit switch 4F is configured to stop the electrical motor 1F when the sliding frame reaches its lowest position. The lower limit switch 4F could have another use, it can activate a burglar alarm when it is deactivated by a burglar opening the window.

(26) FIG. 7 describes the control unit 10A, which is an electronic device which is connected to the limit switches 3F and 4F the electrical motor 1F, the safety switch 9C, the overload sensor 10C, the control box 10B and the burglar alarm 10D. The control unit 10A controls the speed and direction of the electrical motor 1F. The user can control the electrical motor 1F using a control box 10B which also is connected to the control unit 10A.

(27) The sliding window two cables mechanism and the two rolling chain mechanism have an additional safety system which is designed to prevent accidents where the window closes on a person leaning out the window. The safety system includes a safety switch 9C and a safety bar 9D. Where the safety switch is connected to a control unit 10A. The safety switch 9C is installed on top of the lower horizontal bar 9F of the outer frame 9A. The safety bar 9D is installed on top of the safety switch 9C. A person leaning out the window while the window is closing, will be pressing down the safety bar 9D which activates the safety switch 9C which instructs the control unit 10A to reverse the direction the electrical motor 1F. Whereby, the sliding window reverses direction from closing to opening.

(28) Another proposed safety feature is to add to the control unit 10A an overload sensor 10C. The control unit 10A is configured to reverse the direction of the electrical motor 1F when the overload sensor 10C senses a sudden overload of the electrical motor 1F due to an object that blocks the sliding window's motion.

(29) FIG. 8 describes a blow up isometric view of the single roller chain sliding window mechanism. FIG. 9 is identical to FIG. 8 except for the replacement of the crank 110 with the electrical motor 11F and the addition of the safety system 19C (safety switch) and 19D (safety bar). The single roller chain sliding window mechanism includes the two single track sprockets: 11A, 12A the roller chain: 17A and the sliding frame with 4 corners: 15A-15B-15C-15D. The lower left sprocket 11A is installed at the lower left outer corner of the outer frame 19A. The upper left sprocket 12A is installed at the upper left outer corner of the outer frame 19A. The rolling chain 17A has an upper end and a lower end. Where the lower end is attached to the lower left corner 15A and the upper end of the rolling chain is attached to the upper left 15B corner of the sliding frame. The rolling chain is strung downwards starting from the lower left 15A corner and is wound around the lower left sprocket 11A. Next, the rolling chain 17A is strung upwards and is wound around the upper left sprocket 12A. Next the rolling chain 17A is strung downwards and ends at the upper left 15B corner.

(30) The lower left sprocket 11A also has a crank 110 for manual operation. The crank 110 is installed on the input gearbox axis 11H of the gearbox 11G which is connected by the output axis 11E to the lower left sprocket 11A. FIGS. 8 and 9 also show the limit switches 14F, 13F which are connected to the control unit.

(31) The rollers 15E, 15F are also shown to protrude from their recesses in the sliding frame. In FIG. 9 the electrical motor 11F is installed on the input gearbox axis 11H of the gearbox 11G which is connected by the output axis 11E to the lower left sprocket 11A. In addition, it has also the safety system 19C (safety switch) and 19D (safety bar). Pressing on the safety bar activates the safety switch 19C, which is connected to the control unit 10A. Then the control unit reverses the motor 11F which raises the window.

(32) FIG. 10 depicts the structure and components of the roller chain 17E, 17F and the sprocket wheel 11A.

(33) FIG. 11 describes in a blow-up isometric drawing the moving parts of the two chains mechanism with manual operation. FIG. 12 is identical to FIG. 11 except for the replacement of the crank 21D with the electrical motor 21F. In FIG. 12 the electrical motor 21F is installed on the input gearbox axis 21H of the gearbox 21G which is connected by the output axis 21E to the lower left sprocket 21A. The motor 21F is connected to the control unit which controls its speed and direction. In addition, it has also the safety system 29C (safety switch) and 29D (safety bar). Pressing on the safety bar activates the safety switch 29C, which is connected to the control unit 10A. Then the control unit reverses the motor 21F which raises the window.

(34) As can be observed in FIG. 11, the sliding frame has four corners: 25A, 25B, 25C, 25D. The rollers 25E, 25F, 25G, 25H are installed at recesses near the corresponding sliding frame corners: 25A, 25B, 25C, 25D. The two track sprockets 21A and 22A are installed at the lower left corner and the upper left corner of the outer frame 29A. The single track sprockets 24A and 23A are installed at the lower right corner and the upper right corner of the outer frame 29A. As seen in FIG. 11, the left and right roller chains 26A and 27A are wound around the corresponding first lower track 21B and in second lower track 21C of the lower two track sprocket 21A. Next, roller chains 26A and 27A are strung upwards and wound around the corresponding first upper track 22B and second upper track 22C of upper two track sprocket 22A. The single track sprockets: upper single track sprocket 23A and lower single track sprocket 24A are installed at the corresponding upper right and the lower right corners of the outer frame 29A.

(35) FIG. 11 describes in isometric drawing the moving parts of the two chains mechanism. This includes the four sprockets: 21A, 22A, 23A and 24A, the left roller chain: 26A-26B-26C and the right roller chain 27A-27B-27C and the sliding frame four corners: 25A-25B-25C-25D. Sprocket 21A is the lower two track sprocket installed at the lower left outer corner of the outer frame. Sprocket 22A is the upper two track sprocket installed at the upper left outer corner of the outer frame. Sprocket 24A is the lower single track sprocket installed at the lower right outer corner of the outer frame. Sprocket 23A is the upper single track sprocket installed at the upper right outer corner of the outer frame. The left roller chain has an upper left end 26C and a lower left end 26B. Where the lower left end 26B is attached to the lower left corner 25A of the sliding frame. The upper left end 26C is attached to the upper left corner 25B. The left roller chain 26A is strung downwards starting from the lower left corner 25A and is wound around the first lower track 21B of the lower two track sprocket 21A. Next the left roller chain is strung upwards and is wound around the first upper track 22B of the upper two track sprocket 22A. Next, the left roller chain is strung downwards and ends at the upper left end 26C, which is attached to the upper left corner 25B.

(36) The right roller chain comprising an upper right end 27C and a lower right end 27B. Where the lower right end 27B is attached to the lower right corner 25D. The upper right end 27C is attached to the upper right corner 25C.

(37) The right roller chain 27A is strung downwards starting from the lower right end 27B and is wound around the lower single track sprocket 24A. Next, the right roller chain 27A is strung leftwards and is wound around the second lower track 21C of the lower two track sprocket 21A. Next, the right roller chain is strung upwards and is wound around the second upper track 22C of the upper two track sprocket 22A. Next, the right roller chain 27A is strung rightwards and is wound around the upper single track sprocket 23A. Next, the right roller chain is strung downwards and ends at upper right end 27C, which is attached to the upper right corner 25C of the sliding frame.

(38) The lower two track sprocket 21A also has a crank 21D for manual operation. The crank 21D is installed on the input gearbox axis 21H of the gearbox 21G which is connected by the output gearbox axis 21E to the lower two track sprocket 21A.

(39) Sprocket 21A has a crank 21D which is installed on the input gearbox axis 21H. The gearbox has an output gearbox axis 21E which is connected to the axis 21E and enables manual turning of the lower two track sprocket 21A which drives the whole sliding window mechanism. As illustrated in FIG. 12 the crank 21D is replaced by an electrical motor 21F to provide motorized opening and closing of the two roller chain sliding window mechanism. The limit switches which limit the travel of the sliding frame within the outer frame are also shown: 23F and 24.