Elevator cars typically include a toe guard situated beneath the elevator car. The toe guard is typically rigid and up to two meters in length. A significant amount of clearance beneath the elevator car is therefore required to avoid bumping the toe guard against the bottom of the shaft when the elevator car is situated at a lowest landing.
Elevator systems have included a pit at the bottom of the hoistway, in part, to provide sufficient clearance between the bottom of the elevator car and the bottom of the hoistway. Typical pit configurations provide a sufficient clearance for typical toe guards. More recently, however, elevator pits have been eliminated or reduced in size. Conventional toe guards do not allow for elevator cars in such systems to travel as low as necessary.
One suggestion for addressing such a situation is shown in U.S. Pat. No. 6,095,288. That document includes a toe guard panel that is moveable from a position where the toe guard extends vertically downward from the elevator car into a position where the toe guard is tucked beneath the elevator car in a nearly horizontal orientation.
An exemplary elevator assembly includes a hoistway having a bottom surface and an elevator car, which is configured to move in the hoistway and which has a frame member. At least one toe guard panel is moveable between a first position and a second position. In the first position the toe guard panel is situated to provide a vertical surface beneath the elevator car and the toe guard panel has an end spaced a first distance from the elevator car. In the second position the toe guard panel is situated with a second, shorter distance between the end and the elevator car. A moving mechanism coupled with the toe guard panel selectively moves the toe guard panel from the first position into the second position. An instigator member, which is situated in a selected vertical position above the hoistway bottom, interacts with the moving mechanism to begin movement of the toe guard panel from the first position when the frame member of the elevator car is approximately at the selected vertical position.
In one example embodiment that includes the elements of the foregoing elevator assembly, the moving mechanism may comprise a cable that pulls the toe guard panel toward the second position responsive to interaction with the instigator member.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the moving mechanism may comprise a hook near one end of the cable and the instigator member may comprise a catch member that catches the hook as the elevator car frame member descends toward the selected vertical position. The hook may remain on the catch member as the elevator car frame member descends beneath the selected vertical position such that the cable continues to pull the toe guard panel away from the first position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the cable may be connected to the toe guard panel near an opposite end of the cable.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the moving mechanism may comprise a plurality of wheels supported beneath the elevator car and the cable may at least partially wrap around the wheels.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the moving mechanism may comprise a hinge having a first arm between the elevator car and a pivot. A second arm may be between the pivot and the toe guard panel. The cable may urge the pivot in a direction corresponding to the toe guard panel moving from the first position toward the second position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the hinge may include a limit feature that limits an amount of movement of the toe guard panel away from the second position to ensure a desired vertical orientation of the toe guard panel.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the moving mechanism may comprise a lever having a first end connected to the toe guard panel and a follower member near a second, opposite end of the lever. The instigator may comprise a cam that guides the follower to cause the lever to move in a direction to urge the toe guard panel out of the first position. The cam may contact the follower at least when the frame member of the elevator car is at approximately the selected vertical position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the follower may comprise a roller and the cam may comprise a surface at an oblique angle relative to a direction of movement of the elevator car.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the follower may have a first portion that contacts the cam and a second portion that is received in a groove on the elevator car frame. The groove may establish a path of movement for the follower corresponding to movement of the toe guard panel between the first and second positions.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, one end of the groove may include a detent that the second portion of the follower is received against for preventing movement of the lever and for maintaining the toe guard panel in the first position. The instigator may cause the follower to be separated from the detent as the elevator car frame member descends to approximately the selected vertical position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the cam may comprise a surface that the follower follows as the elevator car frame member moves downward from the selected vertical position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the moving mechanism may comprise a first roller and the instigator may comprise a first cam at the selected vertical position. The first roller may contact the first cam as the frame member of the elevator car approaches the selected vertical position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the first roller may be near one end of the toe guard panel and the moving mechanism may comprise a second roller closer to another end of the toe guard panel. A second cam may interact with the second roller to urge the toe guard panel further toward the second position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the second cam may be positioned vertically beneath the first cam and the second cam may be near a lowest possible position of the elevator car frame member.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the assembly may also include a third roller and a third cam. The second cam may have a surface that urges the second roller in a first direction as the elevator car frame member descends beneath the selected vertical position. The third cam may have a surface that urges the third roller in a second direction that is generally opposite to the first direction.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the toe guard panel may comprise at least two panels that are foldable into the second position. The second roller and the second cam may urge one of the panels to move relative to another of the panels for moving into the second position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, a locking member may maintain the toe guard panel in the first position. The first cam may cause movement of the first roller to unlock the locking member to allow the toe guard panel to begin to move from the first position toward the second position.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, the locking member may comprise a latch. Movement of the first roller along the first cam may cause rotation of the latch.
In another example embodiment that includes the elements of any of the foregoing elevator assembly embodiments, a bracket may be configured to position the instigator in the selected vertical position and may be configured to be connected with a guide rail for establishing a desired horizontal position of the instigator member relative to a path of movement of the elevator car.
The various features and advantages of disclosed example embodiments will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
An elevator car 22 is moveable within a hoistway 24. A surface 26 near the bottom of the hoistway 24 may be the floor of the pit or a bottom hoistway surface in examples that do not include a pit at the bottom of the hoistway 24.
A toe guard assembly 30A, 30B, 30C is provided on the elevator car 22 to cover a space between a bottom of the elevator car 22 and a nearby landing in the unlikely event that a hoistway door (not illustrated) is open and the car 22 is not aligned with the landing. The presence of the toe guard assembly 30A, 30B, 30C has an impact on how low the elevator car 22 can descend. Each example toe guard assembly 30A, 30B, 30C is moveable from the first position shown in
The example of
The moving mechanism 40 includes a cable 42 connected with the toe guard panel 32 near a first end 44 of the cable 42. A hook 46 is connected with the cable 42 near an opposite end of the cable 42. A hook positioner 48 holds the hook 46 in a desired position relative to the elevator car frame member 34 when the panel 32 is in the first position.
The cable 42 extending between the connection with the toe guard panel 32 at 44 and the hook 46 follows a path that includes at least partially wrapping around wheels 50 and 52 that are supported on the elevator car. The cable 42 also is received against a pivot 54, which is part of a hinge 56 associated with the toe guard panel 32. In this example, the hinge 56 has a first arm 58 extending between the elevator car frame member 34 and the pivot 54. A second arm 60 extends between the pivot 54 and the toe guard panel 32. The hinge 56 facilitates movement of the toe guard panel 32 about the pivotal mounting 38.
In this example, the hinge 56 includes a limit feature 62 that limits an amount of movement of the toe guard panel 32 to ensure a desired vertical orientation of the toe guard panel 32. In this example, the limit feature 62 is a portion of the arm 58 received against the arm 60 when the toe guard panel 32 is in the first position. The presence of the cable 42 received against the pivot 54 and the limit feature 62 cooperates to maintain the toe guard panel 32 in the first position in a suitably stable manner to provide a desired toe guard function during elevator system operation.
An instigator member 64 is situated at a selected vertical position along the hoistway 24. The instigator member 64 causes the moving mechanism 40 to move the toe guard panel 32 from the first position (shown in
In addition to the cable pulling on the toe guard panel 32, the cable 42 in this example urges the pivot 54 toward the toe guard panel at the beginning of the movement of the toe guard panel 32 out of the first position.
As the frame member 34 ascends through the hoistway 24 and approaches the instigator member 64, the hook positioner 48 removes the hook 46 from the catch so that the components of the moving mechanism 40 are once again in the configuration shown schematically in
The moving mechanism 70 includes a follower 76 near an opposite end 73 of the lever 72. The follower 76 interacts with an instigator member 78 for moving the toe guard panel 32 out of the first position (shown in
As the elevator car descends and the car frame member 34 approaches approximately the selected vertical position of the cam surface 80 on the instigator member 78, the follower 76 contacts the cam surface and follows along it as the elevator car continues to descend. This can be appreciated by comparing
In this example, the toe guard panel 32 is oriented vertically in the first position shown in
One feature of this example is that the follower 76 includes a roller portion that rides along the surfaces 80 and 82 of the instigator member 78. Another follower portion, which is received within a groove 86 (which in this example is associated with the frame member 34), connects the roller portion to the opposite end 73 of the lever 72. With this construction, the lever 72 and the roller portion of the follower 76 are provided on opposite sides of the car frame 34 whereas the connecting portion of the follower 76 extends through the car frame 32. The groove 86 guides movement of the follower relative to the frame member 34 as the follower 76 moves along the surfaces 80 and 82.
The example groove 86 includes a detent 88 (
As can be appreciated from the drawings, if the toe guard panel 32 remained in the first position, the car frame member 34 would be unable to descend low enough to be at approximately the level of the surface of the lowest landing 68 because of the relatively shallow depth of the pit at the bottom of the hoistway 24. In other words, the distance from the lower surface 26 of the hoistway to the surface of the lowest landing 68 is shorter than the vertical length of the toe guard panel 32 in the first position. The moving mechanism 70 and the moveable toe guard panel 32 allow for the elevator car 22 to descend low enough to enable the lowest landing 68 to be serviced by the car 22, for example.
A moving mechanism 100 facilitates moving the toe guard panel 32C between the first position (shown in
As the frame member 34 descends to approximately the vertical position of an instigator member 110, the moving mechanism 100 begins to move the toe guard panel 32 from the first position. In this example, the instigator member 110 includes a cam surface that the roller 102 engages as the frame member 34 descends to approximately the position of the instigator member 110.
In this example, the instigator member 110 is supported by a bracket member 112 that is associated with brackets 114, 116 and 118. The bracket members 112 and 118 can be secured to a guide rail 120 to maintain a desired position of the instigator member 110 relative to the lower surface 26 and the surface of the lowest landing 68, for example.
As can best be appreciated from
As can be appreciated from
As the elevator car and the frame member 34 continue to descend, the second roller 104 eventually engages the surface 26 at the bottom of the hoistway. As can be appreciated from
As the car frame member continues to descend from the position shown in
As the frame member 34 subsequently ascends to a higher vertical position, the weight of the toe guard panel assembly components tends to urge the toe guard panel 32 back into the first position.
Several example toe guard assemblies are shown that include a moving mechanism for facilitating movement of the toe guard panel from a first position toward a second position to accommodate hoistway configurations that have a relatively shallow pit depth or no pit. Although various features are shown with each of the embodiments, they are not necessarily limited to only the embodiments that are shown. One or more features of one of the example embodiments may be incorporated with or combined with one or more features of another one of the embodiments to meet the needs of a particular situation. Those skilled in the art who have the benefit of this description will realize which of the disclosed features will best suit their particular needs.
The preceding description is exemplary rather than limiting in nature. Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this invention. The scope of legal protection given to this invention can only be determined by studying the following claims.
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PCT/IB2011/001504 | 4/5/2011 | WO | 00 | 10/2/2013 |
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WO2012/137032 | 10/11/2012 | WO | A |
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20140020986 A1 | Jan 2014 | US |