Retractable staircase and method

Abstract

A retractable staircase is disclosed for ascending and descending between a lower elevation and an upper elevation. The retractable staircase comprises a main frame and staircase pivotally coupled to an upper surface. A drive causes a first lifting displacement defining an ascending compound displacement by simultaneously causing an ascending pivot displacement and an ascending slide displacement of the staircase. The drive causes a second lifting displacement defining only the ascending staircase pivot displacement and the ascending frame pivot displacement. The drive maintains the staircase in the upper elevation. The drive causes a first descending displacement defining only a descending staircase pivot displacement. The drive causes a second descending displacement defining a descending compound displacement by simultaneously causing the descending staircase pivot displacement and the descending slide displacement of the staircase. The drive causes an extended length in the tether for positioning the staircase in the lower elevation.

Claims

1. A retractable staircase for ascending and descending between a lower elevation and an upper elevation, the lower elevation having a lower surface and the upper elevation having an upper surface, the retractable staircase, comprising: a main frame having a primary side, a secondary side and extending between a proximal end and a distal end; a frame pivot pivoting coupling said proximal end of said main frame to the upper surface; a staircase having a primary side, a secondary side and extending between a proximal end and a distal end; a plurality of bearings slidably coupling said staircase to said main frame; a drive supported above the upper surface; a tether coupled to said drive and said staircase; said drive causing a first lifting displacement in said staircase and said main frame for reducing the length of said tether and distancing said staircase from the lower surface; said first lifting displacement defining an ascending compound displacement by simultaneously causing an ascending staircase pivot displacement and an ascending frame pivot displacement relative to the frame pivot and causing an ascending slide displacement of said staircase relative to said main frame; said drive causing a second lifting displacement in said staircase and said main frame for reducing the length of said tether and distancing said staircase from the lower surface; said second lifting displacement defined by a lower stop engaging between said main frame and said staircase and terminating said ascending slide displacement of said staircase relative to said main frame and permitting only said ascending staircase pivot displacement and said ascending frame pivot displacement; said drive causing a retracted length in said tether for maintaining said staircase and said main frame in a generally parallel orientation with the upper surface; said drive causing a first descending displacement in said staircase and said main frame for increasing the length of said tether and distancing said staircase from the upper surface; said first descending displacement defined by said lower stop engaging between said main frame and said staircase and preventing a descending slide displacement of said staircase relative to said main frame and permitting only a descending staircase pivot displacement and a descending frame pivot displacement; said drive causing a second descending displacement in said staircase for increasing the length of said tether and distancing said staircase from the upper surface; said second descending displacement defining a descending compound displacement by simultaneously causing said descending staircase pivot displacement and said descending frame pivot displacement relative to said frame pivot and causing said descending slide displacement of said staircase relative to said main frame; and said drive causing an extended length in said tether for positioning said staircase in a generally adjacent orientation with the lower surface; said retractable staircase further including a door cover having a primary side, a secondary side and extending between a proximal end and a distal end; a door cover pivot pivoting coupling said proximal end of said door cover to the upper surface: a sliding link coupling said door cover to said main frame; and said door cover covering said main frame and said staircase during said retracted length in said tether and said staircase in said generally parallel orientation with the upper surface.

2. The retractable staircase as set forth in claim 1, further including said drive causing a third descending displacement in said staircase for increasing the length of said tether and distancing said staircase from the upper surface; and said third descending displacement defined by an upper stop engaging between said main frame and said staircase and terminating said descending slide displacement of said staircase relative to said main frame and permitting only said descending staircase pivot displaces ent and said descending frame pivot displacement.

3. The retractable staircase as set forth in claim 1, wherein said sliding link includes a track coupled to said door cover and a generally U-shape bolt coupled to said main frame; and a first spring and a second spring coupled to said generally U-shape bolt for applying a compression force between said main frame and said staircase.

4. The retractable staircase as set forth in claim 1, further including a tether fastener coupling said tether with said staircase; and a removable hatch in said door cover for accessing said tether fastener and disengaging said tether from said staircase when said staircase in said generally parallel orientation with the upper surface for manually lowering said staircase.

5. The retractable staircase as set forth in claim 1, wherein said staircase includes a primary generally C-shaped channel, a secondary generally C-shaped channel and a plurality of tread boards extending between said primary generally C-shaped channel and said secondary generally C-shaped channel; and said plurality of bearings include a plurality of primary interior rollers coupled to said main frame and rolling against the interior of said primary generally C-shaped channel, a plurality of primary exterior rollers coupled to said main frame and rolling against the exterior of said primary generally C-shaped channel, a plurality of secondary interior rollers coupled to said main frame and rolling against the interior of said secondary generally C-shaped channel, and a plurality of secondary exterior rollers coupled to said main frame and rolling against the exterior of said secondary generally C-shaped channel.

6. The retractable staircase as set forth in claim 5, further including a plurality of primary generally L-shaped brackets coupled to said primary side of said main frame and positioned adjacent to said interior of said primary generally C-shaped channel; a plurality of secondary generally L-shaped brackets coupled to said secondary side of said main frame and positioned adjacent to said interior of said secondary generally C-shaped channel; and said plurality of primary generally L-shaped brackets and said plurality of secondary generally L-shaped brackets preventing said staircase from decoupling from said main frame.

7. The retractable staircase as set forth in claim 1, wherein said drive includes a tubular motor rotatably coupled to a motor mounting bracket; said tether spiraling about said tubular motor for reducing the length of said tether and distancing said staircase from the lower surface; and said tether un-spiraling about said tubular motor for increasing the length of said tether and distancing said staircase from the upper surface.

8. The retractable staircase as set forth in claim 7, further including a bracket hinge coupled to said motor mounting bracket for pivoting said tubular motor between a lower motor position and an upper motor position; a bracket spring coupled to said bracket hinge and said motor mounting bracket for displacing said tubular motor from said lower motor position to said upper motor position upon an absent in load from said staircase to said tether; and a terminating switch engaged upon said tubular motor positioned in said upper motor position for terminating rotation of said tubular motor.

9. The retractable staircase as set forth in claim 1, further including a generally U-shape mounting bracket coupled to the upper surface; said frame pivot coupled to said generally U-shape mounting bracket; a first hanger rod extending from said generally U-shape mounting bracket to said primary side of said staircase; a second hanger rod extending from said generally U-shape mounting bracket to said secondary side of said staircase; and a first hanger rod length adjustment and a second hanger rod length adjustment in said first hanger rod and said second hanger rod respectively, for adjustment the angle of said staircase in said generally adjacent orientations with the lower surface.

10. The retractable staircase as set forth in claim 1, further including a first lower leg extending from said distal end of said staircase; a second lower leg extending from said distal end of said staircase; and a first leg length adjustment and a second leg length adjustment in said first lower leg and said second lower leg respectively, for adjustment the angle of said staircase in said generally adjacent orientation with the lower surface.

11. The retractable staircase as set forth in claim 2, wherein said upper stop includes a primary stop and a secondary stop; said primary stop includes a primary stopping block coupled to said primary side of said main frame and a first threaded rod coupled to said primary side of said staircase; said secondary stop includes a secondary stopping block coupled to said secondary side of said main frame and a second threaded rod coupled to said secondary side of said staircase; and a first threaded rod length adjustment and a second threaded rod length adjustment in said first threaded rod and said second threaded rod respectively, for adjusting the upper stop dimension of said staircase relative to said main frame and adjusting the angle of said staircase in said generally adjacent orientation with the lower surface.

12. The retractable staircase as set forth in claim 1, further including a first hand rail coupled to said primary side of said staircase; and a second hand rail coupled to said secondary side of said staircase.

13. A method for ascending and descending said retractable staircase as set forth in claim 1 between said lower elevation and said upper elevation, the lower elevation having said lower surface and the upper elevation having said upper surface, the method comprising the steps of: displacing said staircase and said main frame and causing said first lifting displacement in said staircase and said main frame for reducing the length of said tether and distancing the staircase from the lower surface wherein the first lifting displacement defining said ascending compound displacement by simultaneously causing said ascending staircase pivot displacement and said ascending frame pivot displacement relative to the frame pivot and causing said ascending slide displacement of the staircase relative to the main frame; displacing the staircase and the main frame and causing said second lifting displacement in the staircase and the main frame for reducing the length of the tether and distancing the staircase from the lower surface wherein the second lifting displacement defined by said lower stop engaging between the main frame and the staircase and terminating the ascending slide displacement of the staircase relative to the main frame and permitting only the ascending staircase pivot displacement and the ascending frame pivot displacement; positioning and maintaining the staircase and the main frame in said generally parallel orientation with the upper surface; displacing the staircase and the main frame and causing said first descending displacement in the staircase and the main frame for increasing the length of the tether and distancing the staircase from the upper surface wherein the first descending displacement defined by the lower stop engaging between the main frame and the staircase and preventing said descending slide displacement of the staircase relative to the main frame and permitting only said descending staircase pivot displacement and said descending frame pivot displacement; displacing the staircase and the main frame and causing said second descending displacement in the staircase for increasing the length of the tether and distancing the staircase from the upper surface wherein the second descending displacement defining said descending compound displacement by simultaneously causing the descending staircase pivot displacement and the descending frame pivot displacement relative to the frame pivot and causing the descending slide displacement of the staircase relative to the main frame; and positioning and maintaining the staircase in said generally adjacent orientation with the lower surface.

14. The method for ascending and descending a retractable staircase as set forth in claim 13, further including the step of displacing the staircase and the main frame and causing a third descending displacement in the staircase for increasing the length of the tether and distancing the staircase from the upper surface wherein the third descending displacement defined by an upper stop engaging between the main frame and the staircase and terminating the descending slide displacement of the staircase relative to the main frame and permitting only the descending staircase pivot displacement and the descending frame pivot displacement.

15. The method for ascending and descending a retractable staircase as set forth in claim 13, further including a step of a pivoting said door cover relative to the staircase and the main frame for covering the main frame and the staircase with the door cover during the staircase in the generally parallel orientation with the upper surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) For a fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in connection with the accompanying drawings in which:

(2) FIG. 1 is a front view of a retractable staircase position adjacent to a lower surface;

(3) FIG. 2 is a tight side view of FIG. 1, illustrating the retractable staircase in a structure for ascending into an attic;

(4) FIG. 3 is a sectional view alone line 3-3 in FIG. 2, illustrating a tubular motor in a lower motor position;

(5) FIG. 4 is a sectional view along line 3-3 in FIG. 2, illustrating a sliding link coupling a door cover to a main frame;

(6) FIG. 5 is a sectional view along line 5-5 in FIG. 2, illustrating a primary upper stop and a secondary upper stop;

(7) FIG. 5A is an enlarged front view of portions of FIG. 5;

(8) FIG. 6 is a view alone line 6-6 in FIG. 2;

(9) FIG. 7 is a sectional view along line 7-7 in FIG. 1;

(10) FIG. 8 is an enlarged view of a portion of FIG. 7, illustrating the tubular motor in a lower motor position;

(11) FIG. 9 is an enlarged view of a portion of FIG. 7;

(12) FIG. 10 is an enlarged view of a portion of FIG. 7;

(13) FIG. 11 is an enlarged view of a portion of FIG. 7;

(14) FIG. 12 is a view similar to FIG. 7 illustrating either a first lifting displacement having an ascending compound displacement including a pivoting displacement and a sliding displacement or a continued second descending, displacement having a descending compound displacement including a pivoting displacement and a sliding displacement;

(15) FIG. 13 is a view similar to FIG. 12 illustrating either the continued first lifting displacement having an ascending compound displacement or a second descending displacement having a descending compound displacement including a pivoting displacement and a sliding displacement;

(16) FIG. 14 is an enlarged view of a portion of FIG. 13 illustrating a hanger rod extending from a generally U-shape mounting bracket to the staircase;

(17) FIG. 15 is a view similar to FIG. 12 illustrating either a second lifting displacement or a first descending displacement having only a sliding displacement;

(18) FIG. 16 is a sectional view along line 16-16 in FIG. 15 illustrating a lower stop engaging for terminating an ascending slide displacement;

(19) FIG. 17 is a view similar to FIG. 15 illustrating the staircase in a generally adjacent orientation with the lower surface;

(20) FIG. 18 is a view similar to FIG. 13 illustrating an obstruction object contacting the retractable staircase and thereafter activating a terminating switch for deactivating a drive;

(21) FIG. 19 is an enlarged view of a portion of FIG. 18 illustrating a bracket spring displacing the drive from a lower position to an upper position for engaging the terminating switch; and

(22) FIG. 20 is a right side view of FIG. 19.

(23) Similar reference characters refer to similar parts throughout the several Figures of the drawings.

DETAILED DISCUSSION

(24) FIGS. 1-20 illustrate a retractable staircase 10 for ascending and descending between a lower elevation 12 and an upper elevation 22. The lower elevation 12 has a lower surface 14 and the upper elevation 22 has an upper surface 24. The retractable staircase 10 may be utilized in a commercial building, a residential building, a storage facility, or other structure. As such, the lower surface 14 may include a garage floor 16, an office floor 18, a residence floor 20. Furthermore, the upper elevation 22 may include an attic 32, a second office area 34, a second residence area 36. FIGS. 1-20 illustrate the retractable staircase 10 secured within an upper surface aperture 40 positioned within a floor joist 26. The floor joist 26 includes a lower floor joist surface 28 and an upper floor joist surface 30. A truss 42 includes a bottom chord 52, a diagonal web 50, a vertical web 48 and a top chord 44 for supporting a roof 46.

(25) The retractable staircase 10 is to be positioned within the upper surface aperture 40. In many instances in order to install the retractable staircase 10 within the upper surface aperture 40, the upper surface aperture 40 may required enlarging. For example, a standard upper surface aperture 40 may include the dimensions of 22.554. The upper surface aperture 40 may be enlarged to 95.522.5 or 114.522.5.

(26) The retractable staircase 10 comprises a main frame 60 having a primary side 62, a secondary side 64 and extending between a proximal end 66 and a distal end 68. The main frame 60 may include one or more cross members 70. The main frame 60 may be constructed of metallic material, polymeric material or other rigid materials.

(27) A frame pivot 80 pivotably couples the proximal end 66 of the main frame 60 to the upper surface 24. More specifically, the frame pivot 80 is positioned on the upper floor joist surface 30 of the upper surface 24.

(28) A staircase 100 has a primary side 102, a secondary side 104 and extends between a proximal end 106 and a distal end 108. The staircase 100 is preferably constructed from a primary generally C-shaped channel 110, a secondary generally C-shaped channel 112 and a plurality of tread boards 114 extending there between. A C-shaped tread mounting channel 116 may be utilized for coupling the plurality of tread boards 114 to the primary generally C-shaped channel 110, a secondary generally C-shaped channel 112. Fasteners and/or epoxy 118 may couple the C-shaped tread mounting channel 116 to the primary generally C-shaped channel 110 and a secondary generally C-shaped channel 112. The staircase 100 may be constructed of metallic material, polymeric material or other rigid materials.

(29) A plurality of bearings 120 slidably couple the staircase 100 to the main frame 60. The plurality of bearings 120 may include a plurality of primary interior rollers 122 coupled to the main frame 60 and rolling against the interior of the primary generally C-shaped channel 110, a plurality of primary exterior rollers 124 coupled to the main frame 60 and rolling against the exterior of the primary generally C-shaped channel 110, a plurality of secondary interior rollers 126 coupled to the main frame 60 and rolling against the interior of the secondary generally C-shaped channel 112, and a plurality of secondary exterior rollers 128 coupled to the main frame 60 and rolling against the exterior of the secondary generally C-shaped channel 112.

(30) As best shown in FIG. 5A, the retractable staircase 10 may include a plurality of primary generally L-shaped brackets 270 coupled to the primary side 62 of the main frame 60 and positioned adjacent to the interior of the primary generally C-shaped channel 110. A plurality of secondary generally L-shaped brackets 272 may be coupled to the secondary side 64 of the main frame 60 and positioned adjacent to the interior of the secondary generally C-shaped channel 112. The plurality of primary generally L-shaped brackets 270 and the plurality of secondary generally L-shaped brackets 272 assist in preventing the staircase 100 from decoupling from the main frame 60. For example, if an obstruction object 262 were to become between the retractable staircase 10 and the upper surface 24 during ascending of the retractable staircase 10, may cause the staircase 100 to dislodge from the main frame 60. More specifically, the plurality of bearings 120 may become dislodged. The plurality of primary generally L-shaped brackets 270 and the plurality of secondary generally L-shaped brackets 272 define a safety feature in that in the event the plurality of bearings 120 may become dislodged, the plurality of primary generally L-shaped brackets 270 and the plurality of secondary generally L-shaped brackets 272 will prevent the staircase 100 from disengaging from the mainframe 60.

(31) A drive 140 is supported above the upper surface 24. More specifically, the dive 140 may be secured to the top chord 44. Additional framing may be required to couple the dive 140 to the upper surface 24. The drive 140 may include a tubular motor 142 rotatably coupled to a motor mounting bracket 144. The drive 140 may be controlled by an electrical circuit 300 that may include a wireless remote 302. The tubular motor 142 may further include a smart or programmable function for programming the lower position and the upper position of the retractable staircase 10 into a memory. The tubular motor 142 may include a radio controlled awning motor. A safety button may be electrically coupled to the dive 140. The safety button may be installed within the upper elevation for activating the dive 140 and lowering the staircase 100 if someone is inadvertently closed into the upper elevation 22.

(32) Preferably, the drive 140 is positioned between 42 inches to 46 inches above the upper surface aperture 40. In addition, the drive 140 is preferably positioned such that the location of the drive 140 is displaced horizontally between 20 inches to 32 inches from the non-pivoting edge of the upper surface aperture 40. If the upper elevation 22 has a very lower vertical clearance height, the drive 140 is preferably located closer to the horizontal displacement of 20 inches for reducing the inserting dimension of the proximal end 106 of the staircase 100 of both the upper surface 24 and into the upper elevation 22. This may be required wherein the retractable staircase 10 is utilized in an office or residence with a low pitched roof.

(33) A tether 146 is coupled between the drive 140 and the staircase 100. The tether 146 may include a metallic cable, polymer cable, Teflon cable or other flexible elongated members 150. The tether 146 may include a tether loop 148 wherein the two ends engage the tubular motor 142. The tether 146 spirals about the tubular motor 142 for reducing the length of the tether 146 and distancing the staircase 100 from the lower surface 14. Alternatively, the tether 146 un-spirals about the tubular motor 142 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24.

(34) As shown in FIGS. 12 and 13 the drive 140 causes a first lifting displacement 180 in the staircase 100 and the main frame 60 for reducing the length of the tether 146 and distancing the staircase 100 from the lower surface 14. The first lifting displacement 180 defines an ascending compound displacement by simultaneously causing an ascending staircase pivot displacement 182 and an ascending frame pivot displacement 184 relative to the frame pivot 80 and causing an ascending slide displacement 186 of the staircase 100 relative to the main frame 60. The ascending compound displacement including the ascending staircase pivot displacement 182, the ascending frame pivot displacement 184 and the ascending slide displacement 186 requires less clearance space above the upper surface 24.

(35) As shown in FIG. 15, the drive 140 causes a second lifting displacement. 190 in the staircase 100 and the main frame 60 for reducing the length of the tether 146 and distancing the staircase 100 from the lower surface 14. The second lifting displacement 190 is defined or occurs upon a lower stop 192 engaging between the main frame 60 and the staircase 100 and thereafter terminates the ascending slide displacement 186 of the staircase 100 relative to the main frame 60 and permits only the ascending staircase pivot displacement 182 and the ascending frame pivot displacement 184. As shown in FIG. 16, the lower stop 192 may be coupled to the staircase 100 and engage a lower primary stop block 196 and a lower secondary stop block 198 coupled to the main frame 60. The second lifting displacement 190 requires less clearance space above the upper surface 24.

(36) As shown in FIG. 17 the drive 140 causes a retracted length 194 in the tether 146 for maintaining the staircase 100 and the main frame 60 in a generally parallel orientation with the upper surface 24.

(37) The process for ascending the staircase 100 and the main frame 60 are reversed for lowering the staircase 100 and the main frame 60 to the lower surface 14. The tubular motor 142 rotates in the opposite direction and gravity assists in lowering the retractable staircase 10. More specifically, FIGS. 17 to 15, the drive 140 causes a first descending displacement 200 in the staircase 100 and the main frame 60 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24. The first descending displacement 200 is defined by the lower stop 192 engaging between the main frame 60 and the staircase 100 and preventing a descending slide displacement 202 of the staircase 100 relative to the main frame 60 and permitting only a descending staircase pivot displacement 204 and a descending frame pivot displacement 206.

(38) FIGS. 13 to 12 illustrate the drive 140 causing a second descending displacement 210 in the staircase 100 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24. The second descending displacement 210 defines a descending compound displacement 212 by simultaneously causing the descending staircase pivot displacement 204 and the descending frame pivot displacement 206 relative to the frame pivot 80 and causing the descending slide displacement 202 of the staircase 100 relative to the main frame 60. The drive 140 causes an extended length 224 in the tether 146 for positioning the staircase 100 in a generally adjacent orientation with the tower surface 14.

(39) FIG. 7 illustrates the drive 140 causing a third descending displacement 220 in the staircase 100 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24. The third descending displacement 220 is defined by an upper stop 222 engaging between the main frame 60 and the staircase 100 and terminating the descending slide displacement 202 of the staircase 100 relative to the main frame 60 and permitting only the descending staircase pivot displacement 204 and the descending frame pivot displacement 206.

(40) As shown in FIGS. 5 and 10, the upper stop 222 includes a primary stop 225 and a secondary stop 226. The primary stop 225 includes a primary stopping block 227 coupled to the primary side 62 of the main frame 60 and a first threaded rod 316 coupled to the primary side 102 of the staircase 100. The secondary stop 226 includes a secondary stopping block 228 coupled to the secondary side 64 of the main frame 60 and a second threaded rod 322 coupled to the secondary side 104 of the staircase 100. A first threaded rod length adjustment 324 and a second threaded rod length adjustment 326 are in the first threaded rod 316 and the second threaded rod 322 respectively, for adjusting the upper stop 222 dimension of the staircase 100 relative to the main frame 60 and adjusting the angle of the staircase 100 in the generally adjacent orientation with the lower surface 14.

(41) The retractable staircase 10 may include a door cover 230 having a primary side 232, a secondary side 234 and extending between a proximal end 236 and a distal end 238. A door cover pivot 240 pivotably couples the proximal end 236 of the door cover 230 to the upper surface 24. A sliding link 242 couples the door cover 230 to the main frame 60. The door cover 230 covers the main frame 60 and the staircase 100 during the retracted length 194 in the tether 146 and the staircase 100 in the generally parallel orientation with the upper surface 24.

(42) As best shown in FIG. 4, the sliding link 242 may include a track 244 or bar coupled to the door cover 230 and a generally U-shape bolt 246 coupled to the main frame 60. A first spring 248 and a second spring 249 are coupled to the generally U-shape bolt 246 for applying a compression force between the main frame 60 and the staircase 100. The sliding link 242 assures that the door cover 230 will firmly engage with the upper surface 24 during the retracted length 194 in the tether 146 and the staircase 100 in the generally parallel orientation with the upper surface 24.

(43) As best shown in FIG. 9, a tether fastener 250 couples the tether 146 with the staircase 100. The tether fastener 250 may include a bolt 252 engaging a nut 254 applying a compressive force against the tether 146. A removable hatch 260 may engage in the door cover 230 for accessing the tether fastener 250. After removing the removable hatch 260 from the door cover 230, the tether fastener 250 is exposed. If for some reason the retractable staircase 10 is unable to be lowered from the retracted length 194 wherein the staircase 100 is in a generally parallel orientation with the upper surface 24, the tether fastener 250 may be disengaged from the staircase 100 for disengaging the tether 146 from the staircase 100 for manually lowering the staircase 100.

(44) As best shown in FIGS. 18-20, the retractable staircase 10 may further include a bracket hinge 160 coupled to the motor mounting bracket 144 for pivoting the tubular motor 142 between a lower motor position 162 and an upper motor position 164. A bracket spring 166 is coupled to the bracket hinge 160 and the motor mounting bracket 144 for displacing the tubular motor 142 from the lower motor position 162 to the upper motor position 164 upon an absent in load from the staircase 100 to the tether 146. The bracket spring 166 may include a first bracket spring 170 and a second bracket spring 172 applying a compressive three for promoting the tubular motor 142 into the upper motor position 164.

(45) A terminating switch 174 is engaged upon the tubular motor 142 positioned in the upper motor position 164 for disengaging the power source to the tubular motor 142 and terminating rotation of the tubular motor 142. More specifically, if the retractable staircase 10 is in a descending displacement and an obstruction object 262 contacts the retractable staircase 10, the tensile stress in the tether 146 will be removed causing the terminating switch 174 to halt the tubular motor 142. The obstruction object 262 may include an individual, an object, pet or other items.

(46) In order to mount the retractable staircase 10 within the upper surface 24, a generally U-shape mounting bracket 82 may be coupled to the upper surface 24. The frame pivot 80 is coupled to the generally U-shape mounting bracket 82. For specifically, a primary U-shaped rod holder 84 and a secondary U-shaped rod holder 86 receive a mainframe rod 88 and traverse the main frame 60. A primary collar 90 and a secondary collar 92 encircle the mainframe rod 88 for permit adjustments for centering the retractable staircase 10 within the upper surface aperture 40.

(47) The retractable staircase 10 may further include a first hanger rod 280 extending from the generally U-shape mounting bracket 82 to the primary side 102 of the staircase 100. A second hanger rod 282 extends from the generally U-shape mounting bracket 82 to the secondary side 104 of the staircase 100. Preferably, the first hanger rod 280 and the second hanger rod 282 include a pivoting end 284 at the staircase 100 and a threaded end 286 at the generally U-shape mounting bracket 82. A nut threadably engages the threaded end. 286 for creating a first hanger rod length adjustment 288 and a second hanger rod length adjustment 289 in the first hanger rod 280 and the second hanger rod 282 respectively. The first hanger rod length adjustment 288 and a second hanger rod length adjustment 289 allow for adjustments in the angle of the staircase 100 in the generally adjacent orientation with the lower surface 14. Alternatively, to the first hanger rod 280 and the second hanger rod 282, the retractable staircase 10 may utilizes adjustable scissors type told ing bracket.

(48) The retractable staircase 10 may farther include a first lower leg 290 extending from the distal end 108 of the staircase 100. A second lower leg 292 extends from the distal end 108 of the staircase 100. The first lower leg 290 and the second lower leg 292 may include a threaded bolt 294. A first leg length adjustment 296 and a second leg length adjustment 298 are in the first lower leg 290 and the second lower leg 292 respectively, by rotation. The first leg length adjustment 296 and a second leg length adjustment 298 permit for adjusting the angle of the staircase 100 in the generally adjacent orientation with the lower surface 14. The first leg length adjustment 296 and a second leg length adjustment 298 also permit leveling the plurality of tread boards 114 due to an inconsistent or non-level lower surface 14.

(49) A first hand rail 330 may be coupled to the primary side 102 of the staircase 100. A second hand rail 332 may be coupled to the secondary side 104 of the staircase 100. The first hand rail 330 and the second hand rail 332 preferably extend adjacent to the proximal end 106 and the distal end 108 of the staircase 100. Since the first hand rail 330 and the second hand rail 332 extend almost the entire length of the staircase 100, the safety of the individual traversing the retractable staircase 10 is greatly improved by allowing the individual to grasp the hand rail 330, 332 almost the entire length of the staircase 100.

(50) The subject invention also incorporates a method for ascending and descending a retractable staircase 100 between a lower elevation 12 and an upper elevation 22. The method comprising the steps of displacing the staircase 100 and the main frame 60 and causing the first lifting displacement 180 in the staircase 100 and the main frame 60 for reducing the length of a tether 146 and distancing the staircase 100 from the lower surface 14 wherein the first lifting displacement 180 defines an ascending compound displacement by simultaneously causing an ascending staircase pivot displacement 182 and an ascending frame pivot displacement 184 relative to the frame pivot 80 and causing an ascending slide displacement 186 of the staircase 100 relative to the main frame 60.

(51) Thereafter, the staircase 100 and the main frame 60 are further displaced and cause a second lifting displacement 190 in the staircase 100 and the main frame 60 for reducing the length of the tether 146 and distancing the staircase 100 from the lower surface 14 wherein the second lifting displacement 190 is defined by a lower stop 192 engaging between the main frame 60 and the staircase 100 and terminates the ascending slide displacement 186 of the staircase 100 relative to the main frame 60 and permits only the ascending staircase pivot displacement 182 and the ascending frame pivot displacement 184.

(52) The staircase 100 and the main frame 60 are positioned and are maintained in a generally parallel orientation with the upper surface 24.

(53) The staircase 100 and the main frame 60 are displaced and cause a first descending displacement 200 in the staircase 100 and the main frame 60 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24 wherein the first descending displacement 200 is defined by the lower stop 192 engaging between the main frame 60 and the staircase 100 and prevents a descending slide displacement 202 of the staircase 100 relative to the main frame 60 and permitting only a descending staircase pivot displacement 204 and a descending frame pivot displacement 206.

(54) Thereafter, the staircase 100 and the main frame 60 are displaced and cause a second descending displacement 210 in the staircase 100 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24 wherein the second descending displacement 210 defines a descending compound displacement 212 by simultaneously causing the descending staircase pivot displacement 204 and the descending frame pivot displacement 206 relative to the frame pivot 80 and causing the descending slide displacement 202 of the staircase 100 relative to the main frame 60.

(55) The staircase 100 is then positioned and maintained in a generally adjacent orientation with the lower surface 24.

(56) A further step may include displacing, the staircase 100 and the main frame 60 and causing a third descending displacement 220 in the staircase 100 for increasing the length of the tether 146 and distancing the staircase 100 from the upper surface 24 wherein the third descending displacement 220 is defined by an upper stop 222 engaging between the main frame 60 and the staircase 100 and terminating the descending slide displacement 202 of the staircase 100 relative to the main frame 60 and permitting only the descending staircase pivot displacement 204 and the descending frame pivot displacement 206.

(57) A further step includes pivoting a door cover 230 relative to the staircase 100 and the main frame 60 for covering the main frame 60 and the staircase 100 with the door cover 230 during the staircase 100 in tyre generally parallel orientation with the upper surface 24.

(58) The present disclosure includes that contained in the appended claims as well as that of the foregoing description. Although this invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention.