ELECTRONIC GATE

Abstract

An electric gate system adapted to close an open space. The electric gate system includes a support disposed at an edge of the open space, and a first plurality of gate segments. Each of the first plurality of gate segments has a closed operative orientation and an open operative orientation, where the closed operative orientation and the open operative orientation are in a single plane and are rotationally offset from one another. A gate opening assembly is attached to the support. At least one electric motor is functionally associated with each of a second plurality of gate segments, the second plurality of gate segments being a subset of the first plurality of gate segments. During operation thereof, the at least one electric motor causes simultaneous rotational motion of all gate segments in the second plurality of gate segments.

Claims

1. An electric gate system adapted to close an open space, the electric gate system comprising: a support disposed at an edge of said open space; a first plurality of gate segments, each of said first plurality of gate segments having a closed operative orientation and an open operative orientation, said closed operative orientation and said open operative orientation being in a single plane and being rotationally offset from one another; and a gate opening assembly, attached to said support, said gate opening assembly comprising at least one electric motor functionally associated with each of a second plurality of gate segments, said second plurality of gate segments being a subset of said first plurality of gate segments, wherein during operation thereof, said at least one electric motor causes simultaneous rotational motion of all gate segments in said second plurality of gate segments.

2. The electric gate system of claim 1, wherein, in said closed operative orientation said gate segments in said first plurality of gate segments, together, cover the open space, and in said open operative orientation at least a portion of each of said gate segments in said first plurality of gate segments are disposed one in front of the other in parallel planes.

3-4. (canceled)

5. The electric gate system of claim 1, wherein at least one gate segment in said first plurality is not included in said second plurality.

6. (canceled)

7. The electric gate system of claim 1, wherein said second plurality of gate segments includes all the segments in the first plurality of gate segments.

8. The electric gate system of claim 1, wherein each gate segment of said first plurality of gate segments forms an angular slice of said gate, extending from a base angle disposed adjacent said gate opening assembly.

9-10. (canceled)

11. The electric gate system of claim 1, said gate opening assembly further comprising: a gear reducer having an input shaft connected to said at least one electric motor, and an output shaft; and a plurality of segment-moving subassemblies, functionally associated with said output shaft of said gear reducer, each of said segment-moving subassemblies being functionally associated with one gate segment of said second plurality of gate segments, and being adapted to control motion of said one gate segment.

12. The electric gate system of claim 11, wherein said gear reducer includes an additional input shaft connected or connectable to a manually rotatable handle.

13. The electric gate system of claim 11, further comprising a second gear reducer, having a second input shaft connected to said output shaft, and a second output shaft, wherein said plurality of segment moving subassemblies are connected to said second output shaft and are functionally associated with said output shaft via said second gear reducer.

14. (canceled)

15. The electric gate system of claim 11, wherein each of said segment-moving subassemblies comprises: a first sprocket, mounted onto said output shaft and rotatable therewith; a second sprocket, mounted onto an axle disposed parallel to said output shaft, and rotatable relative to said axle; a transmission chain connecting said first sprocket and said second sprocket; and an engagement arm, mounted onto said second sprocket and having a specific gate segment of said second plurality of gate segments mounted thereon, wherein rotation of said output shaft causes rotation of said first sprocket, which in turn drives rotation of said second sprocket, said engagement arm, and said specific gate segment.

16. The electric gate system of claim 15, wherein a first gate segment of said second plurality of gate segments, associated with a first segment-moving subassembly of said plurality of segment moving subassemblies, is adapted to rotate to a first angular extent when transitioning from said closed operative orientation to said open operative orientation; a second gate segment of said second plurality of gate segments, associated with a second segment-moving subassembly of said plurality of segment moving subassemblies, is adapted to rotate to a second angular extent when transitioning from said closed operative orientation to said second angular orientation; wherein said first angular extent is different from said second angular extent; and wherein said first sprocket included in said first segment-moving subassembly has a different number of teeth or a different diameter than said first sprocket included in said second segment-moving subassembly.

17. The electric gate system of claim 16, wherein said first angular extent is greater than said second angular extent and said first sprocket included in said first segment-moving subassembly has a greater number of teeth or a greater diameter than said first sprocket included in said second segment-moving subassembly.

18. The electric gate system of claim 1, further comprising a counter support disposed at a second edge of said open space, said counter support including a plurality of support brackets, wherein, in said closed operative orientation, ends of at least some of said first plurality of gate segments, distal to said support, engage corresponding ones of said plurality of support brackets.

19. The electric gate system of claim 1, wherein at least some of said first plurality of gate segments have mounted thereon segment-engaging brackets, wherein, in said closed operative orientation, a segment-engaging bracket of a specific one of said first plurality of gate segments is adapted to engage another gate segment adjacent to said specific one of said plurality of said gate segments.

20. An assembly for mobilizing a plurality of gate segments, the assembly comprising; an electric motor; a gear reducer having an input shaft connected to said electric motor, and an output shaft; and a plurality of segment-moving subassemblies, functionally associated with said output shaft of said gear reducer, each of said segment-moving subassemblies being adapted to have a corresponding gate segment mounted thereon and to control motion of the corresponding gate segment, each of said plurality of segment moving subassemblies having a closed operative orientation and an open operative orientation, said closed operative orientation and said open operative orientation being in a single plane and being rotationally offset from one another, wherein during operation thereof, said electric motor causes simultaneous rotational motion of all segment moving subassemblies, to transition all segment moving subassemblies between the closed operative orientation and the open operative orientation.

21. The assembly of claim 20, wherein said gear reducer includes an additional input shaft connected or connectable to a manually rotatable handle.

22. The assembly of claim 20, further comprising a second gear reducer, having a second input shaft connected to said output shaft, and a second output shaft, wherein said plurality of segment moving subassemblies are connected to said second output shaft and are functionally associated with said output shaft via said second gear reducer.

23. The assembly of claim 22, wherein said second gear reducer comprises a planetary gear system.

24. The assembly of claim 20, wherein each of said segment-moving subassemblies comprises: a first sprocket, mounted onto said output shaft and rotatable therewith; a second sprocket, mounted onto an axle disposed parallel to said output shaft and rotatable relative to said axle; a transmission chain connecting said first sprocket and said second sprocket; and an engagement arm, mounted onto said second sprocket and adapted to have the corresponding gate segment mounted thereon, wherein rotation of said output shaft causes rotation of said first sprocket, which in turn drives rotation of said second sprocket, said engagement arm, and said specific gate segment.

25. The assembly of claim 24, wherein a first engagement arm of a first segment-moving subassembly of said plurality of segment moving subassemblies, is adapted to rotate to a first angular extent by rotation of the output shaft at a given angular extent; a second engagement arm of a second segment-moving subassembly of said plurality of segment moving subassemblies, is adapted to rotate to a second angular extent by rotation of the output shaft at the given angular extent; wherein said first angular extent is different from said second angular extent; and wherein said first sprocket included in said first segment-moving subassembly has a different number of teeth or a different diameter than said first sprocket included in said second segment-moving subassembly.

26. The assembly of claim 25, wherein said first angular extent is greater than said second angular extent and said first sprocket included in said first segment-moving subassembly has a greater number of teeth or a greater diameter than said first sprocket included in said second segment-moving subassembly.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0034] The foregoing discussion will be understood more readily from the following detailed description of the invention, when taken in conjunction with the accompanying Figures, in which:

[0035] FIGS. 1A, 1B, 1C, and 1D are planar front view illustrations of an electric gate according to an embodiment of the present invention, at four stages during opening of the gate;

[0036] FIG. 1E is a planar side view illustration of an embodiment of the electric gate of FIGS. 1A to 1D, in an open position;

[0037] FIGS. 2A and 2B are, respectively, a perspective view illustration and a planar front view illustration of a gate opening assembly forming part of the electric gate of FIGS. 1A to 1D, according to an embodiment of the present invention;

[0038] FIGS. 3A, 3B, and 3C are, respectively, first and second perspective illustrations, and a side view planar illustration, of the gate opening assembly of FIGS. 2A and 2B, having a side cover removed therefrom to show an internal mechanism;

[0039] FIG. 4 is a sectional illustration of the gate opening assembly of FIGS. 2A to 3C;

[0040] FIGS. 5A, 5B, and 5C are, respectively, a perspective view illustration and two planar front view illustrations of an electric gate according to another embodiment of the present invention, the planar front views being when the gate is closed and when the gate is partially open;

[0041] FIGS. 6A, 6B, and 6C are perspective view illustrations of a gate opening assembly forming part of the electric gate of FIGS. 5A to 5C, according to an embodiment of the present invention, where FIG. 6A includes a protective cover; and

[0042] FIGS. 7A, 7B, and 7C are, respectively, first and second perspective illustrations, and a side view planar illustration, of the gate opening assembly of FIGS. 6A to 6C, having a side cover removed therefrom to show an internal mechanism.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] The principles of the inventive electric gate may be better understood with reference to the drawings and the accompanying description.

[0044] Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting.

[0045] For the purposes of the present disclosure, the plane of the gate is a plane in which the gate lies when it is closed, which is typically perpendicular to the ground and to at least one support of the gate.

[0046] For the purposes of the present disclosure, the term substantially is defined as at least 90% of or within 10% deviation of.

[0047] Reference is now made to FIGS. 1A, 1B, 1C, and 1D, which are planar front view illustrations of an electric gate 10 according to an embodiment of the present invention, at four stages during opening of the gate.

[0048] As seen in FIGS. 1A to 1D, gate 10 includes two portions 12, disposed alongside one another, each portion 12 being mounted on a corresponding support 14. However, in some embodiments, such as when closing a relatively narrow opening, gate 10 may include a single portion 12 mounted onto a single support 14.

[0049] As seen, each portion 12 of the gate includes a plurality of gate segments 16a, 16b, 16c, 16d, and 16e, disposed alongside one another. Each of the gate segments spans an angular portion of a lower bottom corner of the gate portion 12, where the gate portion is attached to support 14. In the illustrated embodiment, each of the five gate segments spans a 15 degree angle of the gate, and the support 14 includes a flap 18 spanning an additional 15 degree angle of the gate, resulting in 90 degrees required for a corner. However, the gate may have any desired number of segments, and may span any desired angular breadth (i.e., need not necessarily fill a 90 degree angle, but may fill an acute angle or obtuse angle as well).

[0050] In some embodiments, each gate portion may have a different number of segments, such that two gate portions of a single gate are not mirror images of one another.

[0051] In the illustrated embodiment, all the gate segments 16 span the same angular range, of 15 degrees. However, in some embodiments, different segments may span different angular ranges.

[0052] A gate opening assembly 20 is functionally associated with gate segments 16, as described in further detail hereinbelow with respect to FIGS. 2A to 4, and controls opening of the gate.

[0053] FIG. 1A illustrates gate 10 when it is closed. In this orientation, there is substantially no overlap between gate segments 16, such that the gate segments cover an entire rectangular area of an opening to be closed. However, it is appreciated that the area filled by the gate may be of any shape or dimension. Additionally, the area filled by the gate may be a portion of an openingthe gate need not necessarily fill the entire opening.

[0054] In some embodiments, gate segments 16 are in multiple parallel planes, where each plane segment is disposed slightly in front of, or behind, the next segment, such that when the gate is opened (as shown in FIG. 1D), the segments can be arranged in parallel planes one in front of the other. However, in the closed operative orientation, the segments appear as if they are in a single plane. In some such embodiments, the distance between a plane of front gate segment 16a, and a plane of back gate segment 16e, is substantially equal to the width or thickness of the three intervening gate segments, or any number of intervening gate segments.

[0055] FIG. 1B illustrates a first stage during opening of gate 10. As seen in FIG. 1B, gate segments 16b, 16c, 16d, and 16e have all been rotated, or pivoted, relative to gate opening assembly 20, about a single axis. As such, a portion of each of segments 16b, 16c, 16d, and 16e is disposed behind a portion of a corresponding one of segments 16a, 16b, 16c, and 16d, respectively. However, segment 16a remains stationary and has not moved relative to gate opening assembly 20.

[0056] The mechanism by which gate opening assembly 20 causes segments 16b, 16c, 16d, and 16e to pivot simultaneously about the same axis is described hereinbelow with respect to FIGS. 2A to 4.

[0057] FIG. 1C illustrates a second stage during opening of gate 10. As seen in FIG. 1C, gate segments 16b, 16c, 16d, and 16e have continued to rotate, or pivot, relative to gate opening assembly 20, about a single axis. As such, a larger portion of each of segments 16b, 16c, 16d, and 16e is disposed behind a portion of a corresponding one of segments 16a, 16b, 16c, and 16d than in FIG. 1B. Additionally, segment 16b has engaged segment 16a carries segment 16a with it. In other words, segment 16a rotates or pivots by riding on segment 16b, because of the pivoting of segment 16b.

[0058] FIG. 1D shows gate 10 in an open operative orientation. As seen, in the open operative orientation, which occurs following completion of pivoting of the segments, all the segments 16a, 16b, 16c, 16d, and 16e are disposed in parallel planes to one another, behind flap 18 of support 14.

[0059] When closing gate 10, the states are repeated in the opposite order, with the segments being pivoted in the opposing direction to lower the segments.

[0060] Reference is now additionally made to FIG. 1E, which is a planar side view illustration of electric gate 10 in the open operative orientation. As seen in FIG. 1E, each of the gate segments 16 has mounted at an edge thereof a bracket 19, including a first portion 19a connected to a specific gate segment, e.g. gate segment 16e, a second portion 19b which engages an adjacent, higher, gate segment, e.g. gate segment 16d, and an interim portion 19c disposed between the first and second portions of the bracket.

[0061] In use, brackets 19 reinforce the strength of the gate, and ensure that even if one of the gate segments is not moved by the motor, as explained in further detail hereinbelow, that gate segment may be moved together with a lower gate segment. More specifically, the stuck gate segment may be picked up by the lower gate segment during motion thereof, such that the motion of the lower gate segment would also cause motion of the stuck gate segment.

[0062] Reference is now made to FIGS. 2A and 2B, which are, respectively, a perspective view illustration and a planar front view illustration of gate opening assembly 20 forming part of the electric gate 10, according to an embodiment of the present invention. Reference is additionally made to FIGS. 3A, 3B, and 3C, which are, respectively, first and second perspective illustrations, and a side view planar illustration, of gate opening assembly 20 having a side cover removed therefrom to show an internal mechanism, and to FIG. 4, is a sectional illustration of gate opening assembly 20.

[0063] As seen, gate opening assembly 20 includes an electric motor 22 connected to a gear reducer, for example an NMRV gearbox 24. An additional, manually rotatable, handle 26, connected to a secondary input shaft 26a of NMRV gearbox 24, may provide input to the gearbox.

[0064] An assembly housing 27, which includes a base 28, front and back surfaces 30, one of which has gearbox 24 mounted thereon, an operational side surface 32 including a plurality of slots 34, a second side surface 36, and a top surface 37. In some embodiments, operational side surface 32 may be curved, as shown in FIG. 2A. However, the illustrated embodiment is an example of a structure of the assembly housing, and other structures are considered within the scope of the present invention.

[0065] An output shaft 38 of gearbox 24 extends into a second gear reducer, which, in the illustrated embodiment, is a sun gear 40 of a planetary gear system 42, including sun gear 40 surrounded by a plurality of planet gears 44. An output shaft 46 of planetary gear system 42 rotatably extends between front and back surfaces 30 of assembly housing 27. A second shaft 48 extends between front and back surfaces 30 of assembly housing 27, and is fixed relative thereto. Typically, second shaft 48 is disposed lower than, and typically parallel to, output shaft 46 of planetary gear system 42.

[0066] It is a particular feature of the present invention that, in use, the reduction of the rotation of electric motor 22 is split between the NMRV gearbox 24 and the planetary gear system 42. As a result, the pressure caused by the extreme reduction of rotation required is split between the two systems. Additionally, in the planetary gear system, the pressure is split between multiple engagement surface of the sun gear 40 and planet gears 44, thus resulting in a more robust and durable system, particularly because gates of the present invention are typically disposed outdoors, and are exposed to external pressures, such as wind and mechanical or structural damage to the gate, as well as internal pressures.

[0067] It is to be appreciated that gate opening assembly may include more than two gear reducers, connected in series.

[0068] As seen clearly in FIGS. 3C and 4, mounted onto second shaft 48 are a plurality of sprockets 50b, 50c, 50d, and 50e, which are rotatable relative to second shaft 48. Sprockets 50 may be substantially equally sized, and may have the same number of teeth. In some embodiments, bearings 52 may be disposed between each sprocket 50 and second shaft 48. Each of sprockets 50b, 50c, 50d, and 50e has mounted thereon a corresponding engagement arm, or lever, 54b, 54c, 54d, and 54e. Each of the engagement arms extends through a corresponding one of slots 34, as seen clearly in FIGS. 2A and 2B, and is adapted to have mounted thereon a corresponding one of gate segments 16b, 16c, 16d, and 16e.

[0069] Another plurality of sprockets, including sprockets 56b, 56c, 56d, and 56e are mounted onto output shaft 46 of planetary gear system 42, and are rotatable therewith. Sprockets 56b, 56c, 56d, and 56e each have a different diameter and a correspondingly different number of teeth. Each of sprockets 56b, 56c, 56d, and 56e, is associated with a corresponding one of sprockets 50b, 50c, 50d, and 50e, by a transmission chain 55, similar to a bicycle chain.

[0070] Each set of sprocket 56, corresponding sprocket 50, transmission chain 55, and arm 54 mounted on the corresponding sprocket, is termed herein segment-moving subassembly for opening and closing the corresponding gate segment 16 mounted onto the arm 54.

[0071] In use, when motor 22 is operated, for example by a remote control, rotation of the motor is reduced by gear reducer 24 and by planetary gear system 42, such that output shaft 46 of the planetary gear system rotates slowly. Sprockets 56b, 56c, 56d, and 56e all rotate together with output shaft 46, and to the same degree (e.g., if output shaft rotates one full rotation, each of sprockets 56b, 56c, 56d, and 56e also rotates one full rotation). However, because of the difference in the number of teeth of sprockets 56b, 56c, 56d, and 56e, the rotation of each of the sprockets causes different lengths of rotation of sprockets 50b, 50c, 50d, and 50e, respectively. For example, sprocket 50e, which is connected to sprocket 56e which has the largest number of teeth, will rotate to a greater extent than sprocket 50b, which is connected to sprocket 56b with the smallest number of teeth. Specifically, each of sprockets 50b, 50c, 50d, and 50e will rotate to a different extent, with the rotations all being simultaneous and based on the rotation of output shaft 46.

[0072] The simultaneous differential rotation of sprockets 50b, 50c, 50d, and 50e results in simultaneous differential rotation of the arms 54b, 54c, 54d, and 54e, and in corresponding simultaneous differential rotation of gate segments 16b, 16c, 16d, and 16e. The reduction of the rotation of motor 22, as well as the number of teeth of each of sprockets 56 and of sprockets 50 are computed based on the angular distance each of the gate segments 16 must traverse in order to fully open the gate.

[0073] It is to be appreciated that the use of sprockets 50 and 56, together with transmission chain 55, which engages the sprockets throughout the chain, ensures that there is sufficient force resisting manually moving the segment-moving subassembly and manually raising the corresponding segment.

[0074] It is to be appreciated that, though the description herein relates to a transmission system including sprockets and a transmission chain, any suitable transmission system is considered within the scope of the present invention. For example, the sprockets and chain transmission may be replaced by a transmission system including pulleys and a timing belt, a transmission system including a plurality of cogs, or any other suitable transmission system.

[0075] As discussed hereinabove with respect to FIGS. 1A to 1E, in the illustrated embodiment, gate segment 16a is not actively moved by operation of motor 22, but rather is moved passively by riding on gate segment 16b when that gate segment opens. As such, the gate opening assembly 20 does not include a segment-opening subassembly for engagement with, and for moving of, gate segment 16a.

[0076] In some embodiments, each of the gate segments may be actively moved by the motor 22. In such embodiment, gate opening assembly 20 would include a segment-opening subassembly associated with each of the gate segments.

[0077] In some embodiments, more than one gate segment may be passively moved by another gate segment. In such embodiment, gate opening assembly 20 would include a segment-opening subassembly only for segments that are actively moved. However, it is a particular feature of the present invention that at least two of the gate segments are actively moved by motor 22.

[0078] As discussed hereinabove, manually rotatable, handle 26 is connected to secondary input shaft 26a of NMRV gearbox 24, such that planetary gear system 42 is downstream of handle 26. As a result, the gear reduction provided by planetary gear system 42 is used also when operating the gate manually by rotating handle 26, making it possible to open the gate with a far smaller number of rotations than when the gear reduction is all carried out by NMRV gearbox 24.

[0079] In some embodiments, gate 10 may further include a safety assembly, adapted to stop operation of motor 22 when any of gate segments 16 is stuck or engages another object. In some embodiments, a two-layer safety system may be used. In some such embodiments, a first layer of the safety system may include a safety mechanism based on short circuiting of an electrical circuit disposed within a touch sensitive pad or bar, which would typically be mounted onto a bottom, lengthwise surface of the lowest segments of the gate (for example segments 16e in FIG. 1A). The second layer of the safety system may include an optical safety mechanism, such as an optical sensor sensing the presence of an obstruction in the area of the gate, for example as is known in elevators and other prior art automated doors and gates.

[0080] Reference is now made to FIGS. 5A, 5B, and 5C, which are, respectively, a perspective view illustration and two planar front view illustrations of an electric gate 110 according to another embodiment of the present invention, the planar front views being when the gate is closed and when the gate is partially open.

[0081] Gate 110 is substantially similar to gate 10 described hereinabove, with like numbers representing like components. Specifically, the operation of gate 110 is substantially the same as the operation of gate 10, as described hereinabove. One distinction between gate 110 and gate 10 is in the number of gate segments, where gate 110 includes more gate segments than gate 10. The number of gate segments also impacts the internal mechanism of the gate, as explained hereinbelow. Another distinction is that gate 110 extends from a single side of the opening, and not from two opposing sides of the opening.

[0082] As seen in FIGS. 5A to 5C, gate 110 includes a single portion mounted on a support 114 and extending to a counter support 115. Gate 110 includes a plurality of gate segments 116, disposed alongside one another, here shown as eight segments. Each of the gate segments spans an angular portion of a lower bottom corner of gate 110, where the gate is attached to support 114. In the illustrated embodiment, each of the eight gate segments spans a 10 degree angle of the gate, and the support 114 includes a flap 118 spanning an additional 10 degree angle of the gate, resulting in 90 degrees required for a corner. However, the gate may have any desired number of segments, each spanning a desired angular range, as discussed hereinabove.

[0083] A gate opening assembly 120 is functionally associated with gate segments 116, as described in further detail hereinbelow with respect to FIGS. 6A to 7C, and controls opening of the gate.

[0084] FIGS. 5A and 5B illustrate gate 110 when it is closed. In this orientation, there is substantially no overlap between gate segments 116, such that the gate segments cover an entire area of the opening to be closed. As discussed hereinabove, gate segments 116 may be in multiple parallel planes, such that when the gate is opened (as shown in FIG. 5C), the segments can be arranged in parallel planes one in front of the other. However, in the closed operative orientation, the segments appear as if they are in a single plane. In some such embodiments, the distance between a plane of the frontmost segment and a plane of the backmost segment is substantially equal to the width or thickness of the intervening gate segments.

[0085] As seen, in the closed orientation of gate 110, segments 116 which engage counter support 115, may be disposed within brackets or anchors 117, mounted onto the counter support.

[0086] Additionally, each of gate segments 116 that do not engage counter support 115 has mounted at an upper edge thereof a bracket 119, including a first portion connected to a specific gate segment, and a second portion adapted to hook onto an adjacent, higher, gate segment. When gate 110 is closed, each bracket 119 engages the previous segment. As shown in FIG. 5C, when the gate is opened, the bracket detaches from the previous segment and allows each segment to be raised separately.

[0087] In use, brackets 117 and 119 reinforce the strength of the gate, particularly in windy conditions.

[0088] Turning to FIG. 5C, it is seen that the segments of gate 110 are all opened simultaneously, by rotating, or pivoting about a single axis relative to gate opening assembly 120, as explained hereinabove with respect to gate 10. When closing gate 110, the segments are pivoted in the opposing direction, as explained hereinabove.

[0089] Reference is now made to FIGS. 6A, 6B, and 6C, which are perspective view illustrations of a gate opening assembly 120, where FIG. 6A includes a protective cover, and to FIGS. 7A, 7B, and 7C, which are, respectively, first and second perspective illustrations, and a side view planar illustration, of gate opening assembly 120, having a side cover removed therefrom to show an internal mechanism.

[0090] As seen, and as discussed hereinabove with respect to FIGS. 1A to 4, gate opening assembly 120 includes an electric motor 122 connected to a gear reducer, for example an NMRV gearbox 124, which includes a secondary input shaft 126a for connection of a manual handle.

[0091] Gate opening assembly 120 is adapted to be at least partially disposed within support 114, such that support 114 surrounds portions the gate opening assembly 120 from three sides thereof. As seen in FIG. 6A, a protective cover 127 may be connected to support 114, to enclose assembly 120. Cover 127 may be angled or curved, and typically includes a plurality of slots 134. As shown in FIGS. 6A to 6C, motor 122 and gearbox 124 may be disposed outside of support 114, and mounted to an outside surface thereof.

[0092] An output shaft 138 of gearbox 124 rotatably extends through support 114. A second shaft 148 extends through support 114, and is fixed relative to output shaft 138. Typically, second shaft 148 is disposed lower than, and typically parallel to, output shaft 138.

[0093] In some embodiments, a secondary gear system 142 may be used in series with gear reducer 124, as described hereinabove with respect to FIGS. 2A to 4. In such embodiments, output shaft 138 provides input to the secondary gear system, and an output shaft of the secondary gear extends through support 114.

[0094] As seen, mounted onto second shaft 148 are a plurality of sprockets 150, which are rotatable relative to second shaft 148. In some embodiments, sprockets 150 may be substantially equally sized, and have the same number of teeth. In other embodiments, such as the illustrated embodiment, the sprockets may be in gradually reducing size, with the largest sprockets 150 being closer to gearbox 124, and the smallest being further away from gearbox 124. In some embodiments, bearings may be disposed between each of sprockets 150 and second shaft 148. Each of sprockets 150 has mounted thereon a corresponding engagement arm, or lever, 154. Each of the engagement arms extends through a corresponding one of slots 134, as seen clearly in FIG. 6A, and is adapted to have mounted thereon a corresponding one of gate segments 116. In some embodiments, each engagement arm 154 includes an indentation 153, adapted to fit around output shaft 138 and gears mounted thereon, to facilitate a more compact arrangement of the arms 154 and gate segments mounted thereon when the gate is open.

[0095] A second plurality of sprockets 156 are mounted onto output shaft 138 of gearbox 124, and are rotatable therewith. Sprockets 156 each have a different diameter and a correspondingly different number of teeth. Each of sprockets 156, is associated with a corresponding one of sprockets 150 by a transmission chain 155 to form a segment moving assembly, as described hereinabove.

[0096] As described hereinabove, in use, when motor 122 is operated, for example by a remote control, rotation of the motor is reduced by gear reducer 124 (and by the secondary gear system, when present), such that output shaft 138 rotates slowly. Sprockets 156 all rotate together with the output shaft, and to the same degree, while causing different lengths of rotation of sprockets 150, due to the differences in sizes between sprockets 156 and sprockets 150. Thus, each of sprockets 150 will rotate to a different extent, with the rotations all being simultaneous and based on the rotation of output shaft 138.

[0097] The simultaneous differential rotation of sprockets 150 results in simultaneous differential rotation of the arms 154, and in corresponding simultaneous differential rotation of gate segments 116. The reduction of the rotation of motor 122, as well as the number of teeth of each of sprockets 156 and of sprockets 150 are computed based on the angular distance each of the gate segments 116 must traverse in order to fully open the gate.

[0098] In some embodiments, each of the gate segments may be actively moved by the motor 122. In such embodiment, gate opening assembly 120 would include a segment-opening subassembly associated with each of the gate segments.

[0099] As discussed hereinabove, in some embodiments, a manually rotatable handle 126 may be connected to secondary input shaft 126a of NMRV gearbox 124, to manually operate the gearbox and the gate.

[0100] In some embodiments, gate 110 may further include a safety assembly, adapted to stop operation of motor 122 when any of gate segments 116 is stuck or engages another object, substantially as described hereinabove.

[0101] It will be appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination. Similarly, the content of a claim depending from one or more particular claims may generally depend from the other, unspecified claims, or be combined with the content thereof, absent any specific, manifest incompatibility therebetween.

[0102] Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.