The present invention pertains to an elevator device and a roller guide assembly, specifically, to an improved roller guide that is attached to a car so as to guide the car in the vertical direction along a rail.
A conventional elevator is equipped with a drive means for moving a car up and down along a hoistway and a guide means for preventing the car from becoming displaced or tilted within a plane in order to move the car up and down stably. As for the configuration of the aforementioned drive means, a drive machine is provided at the top of the hoistway, hoist ropes are placed around said drive machine, and the car is suspended at one end of said rope while a counterweight is suspended at the other end so as to balance them, whereby the car and the counterweight are moved up and down in the opposite directions through traction as the drive machine is driven. In addition, the aforementioned guide means comprise a pair of guide rails that are provided near outer side surfaces of the car at opposite positions on the hoistway, and multiple roller guide assemblies that are provided with rollers that contact the respective guide rails and which are positioned above and below the car near its side surfaces.
Japanese Patent No. 4050466 describes a conventional elevator device. As shown in
Elevator system and component designers face the ongoing challenges of reducing costs of elevator systems and components, and fitting elevator systems and components within tighter space constraints. In many circumstances, these objectives can be considered incompatible and unattainable without significant innovation.
In one arrangement, the invention is a roller guide assembly that is provided in an elevator device that is equipped with a hoistway that is formed along the vertical direction, a car that is moved up and down along said hoistway, guide rails that guide the roller guide assemblies when the aforementioned car provided along the aforementioned hoistway is moved up and down, and multiple roller guide assemblies that are provided on the aforementioned car and guided by said guide rails; wherein,
said roller guide assembly for an elevator device comprises a shaft supporting a roller for engaging a guide rail, a shaft support member that receives the shaft therein, and a member inserted between the shaft and the aforementioned shaft support member, wherein the member limits the shaft from turning relative to the shaft support member.
In one possible alternative, the member is tubular.
In this arrangement, because the shaft is supported by the shaft support member via the tubular elastic member, when the rollers are biased in the horizontal direction by the guide rail, a turning force is acted upon the shaft. Because the shaft, the elastic member, and the shaft support member are restrained from turning relative to each other at the boundary parts of these members, the outer peripheral part of the elastic member is fixed, so the turning force from the shaft is acted upon its inner peripheral part. As such, although the elastic member becomes twisted due to the torsional force applied, it returns to its original position as the torsional force is no longer subsequently applied. When the rollers travel over steps formed at joint parts of the guide rails, because the rollers are biased toward the guide rails due to the elastic force of the elastic member, the car is restrained from vibrating. In the event of an unbalanced load due to an unbalanced cargo inside the car, because the car is supported by the guide rails while the elastic members are being twisted, no excessive force is applied to the car, so the car can be restrained from tilting; and the elastic members recover from their twisted state subsequently as the effect of the unbalanced load becomes no longer present. These elastic members achieve a biasing function for biasing the rollers toward the guide rails, a damper function for restraining the biased rollers from reciprocating in the biasing direction repeatedly, and a bearing function for supporting the rollers.
Additionally or alternatively with any of the arrangements, the outer peripheral surface of the aforementioned shaft, the inner and the outer peripheral surfaces of the aforementioned elastic member, and the inner peripheral surface of the aforementioned shaft support member are formed in a circular cross-sectional shape or a polygonal cross-sectional shape; whereby, the polygon formed on the inner and the outer peripheral surfaces of the aforementioned respective members functions as the aforementioned restraining means.
In this arrangement, because the polygonal outer peripheral surface is fitted to the polygonal inner peripheral surface, turning of the elastic member with respect to the shaft support member is restrained, and turning of the shaft with respect to said elastic member is restrained. Thus, the elastic member becomes twisted when a turning force is acted upon said shaft, and it returns to its original position subsequently.
Additionally or alternatively with any of the arrangements, the outer peripheral surface of the aforementioned shaft, the inner and the outer peripheral surfaces of the aforementioned elastic member, and the inner peripheral surface of the aforementioned shaft support member are formed in a circular cross-sectional shape.
Additionally or alternatively with any of the arrangements, the one or more concave parts or recesses are formed either on the inner peripheral surface or on the outer peripheral surface at the boundary parts of the aforementioned shaft, the aforementioned elastic member, and the aforementioned shaft support member while convex parts or projections are formed on the other peripheral surface.
In this arrangement, because the projections are received in the recesses, turning of the elastic member with respect to the shaft support member is restrained, and turning of the shaft with respect to said elastic member is restrained. Thus, the elastic member becomes twisted when a turning force is acted upon said shaft, and it returns to its original position subsequently.
Additionally or alternatively with any of the arrangements, an adhesive is applied at the boundary parts of the aforementioned shaft, the aforementioned elastic member, and the aforementioned shaft support member so as to bond the respective members together in order to configure the restraining means.
In this arrangement, because the respective members are bonded together at the boundary parts, turning of the elastic member with respect to the shaft support member is restrained, and turning of the shaft with respect to said elastic member is restrained. Thus, the elastic member becomes twisted when a turning force is acted upon said shaft, and it returns to its original position subsequently.
Additionally or alternatively with any of the arrangements, the roller guide assembly includes three rollers, and each roller includes a corresponding shaft, shaft support member and tubular member.
In this arrangement, said roller guide assembly is equipped with three rollers, i.e. pairing rollers that sandwich rail body of guide rail and single roller that is provided on the inner side of pairing rail body so as to roll on the facing surface of rail body.
Additionally or alternatively with any of the arrangements, the roller guide assembly is mounted to a car of the elevator system.
When said rollers are provided at the four positions of car, displacement of car within a plane and tilting of car in all directions can be restrained. The present invention is also useable in frameless car configurations, in which one or more of the car panels also act as a structural member. In such an arrangement, for example, the frame members would also function as a car panel (e.g. occupants of the car can see the frame members) and the roller guide assemblies would mount to the frame members.
Additionally or alternatively with any of the arrangements, the roller guide assembly is mounted to a counterweight of the elevator system.
In this arrangement, the roller guide assembly is provided along the hoistway at positions corresponding to side surfaces of the counterweight, and multiple roller guide assemblies could be provided at positions near the side surfaces at the top and bottom of the counterweight for guiding the counterweight along the guide rails in order to move the counterweight without causing displacement or tilting of the counterweight within a plane.
In another arrangements, an elevator system that is equipped with a hoistway that is formed along the vertical direction, a car that is moved up and down along said hoistway, guide rails that guide a roller guide assemblies when the aforementioned car provided along the aforementioned hoistway is moved up and down, and guided by the aforementioned guide rails; wherein,
said elevator system comprises a car and/or a counterweight, and a roller guide assembly mounted to the car and/or counterweight, the roller guide assembly comprising: a shaft supporting a roller for engaging a guide rail; a shaft support member that receives the shaft therein; and a member inserted between the shaft and the aforementioned shaft support member, wherein the member limits the shaft from turning relative to the shaft support member.
In this arrangement, because the shaft is supported by the shaft support member via the tubular elastic member, a turning force is acted upon the shaft when the rollers are swung as they are pushed in the horizontal direction by the guide rail. Because the shaft, the elastic member, and the shaft support member are restrained from turning relative to each other at the boundary parts of these members, the outer peripheral part of the elastic member is fixed, so the turning force from shaft is acted upon its inner peripheral part. As such, although the elastic member becomes twisted due to the torsional force applied, it returns to its original position as the torsional force is no longer subsequently applied. When the rollers travel over steps formed at joint parts of the guide rails, because the rollers are biased toward the guide rails due to the elastic force of the elastic member, the car and/or counterweight is restrained from vibrating. In the event of an unbalanced load due to an unbalanced cargo inside the car, because the car is supported by the guide rails while the elastic members are being twisted, no excessive force is applied to the car, so the car can be restrained from tilting; and the elastic members recover from their twisted state subsequently as the effect of the unbalanced load becomes no longer present. These elastic members achieve a biasing function for biasing the rollers toward the guide rails, a damper function for restraining the biased rollers from reciprocating in the biasing direction repeatedly, and a bearing function for supporting the rollers.
Various exemplary arrangements of the elevator device and the roller guide assembly in accordance with the present invention will be explained below.
As shown in
The aforementioned guide rails 2 comprises rail body 2a and retainer part 2b for retaining said rail body 2a and has a quasi-T-shaped cross-section. The pair of guide rails 2 and 2 for the car 1 are provided with rail bodies 2a facing each other. The pair of guide rails 2 and 2 for the counterweight are provided with rail bodies 2a facing each other, although these guide rails are not necessarily facing the same direction as the car guide rails depending on the hoistway and elevator system arrangement.
The car 1 can be provided with traveling frame 4 so as to surround car 1 in the vertical direction. Said traveling frame 4 comprises two vertical frames 4a, two top frames 4b, and two bottom frames 4b; wherein, right and left vertical frames 4a and bottom frames 4b are provided in contact with the side surfaces and the bottom surface of car 1, and top frames 4b are provided at a position slightly away from the top surface of car 1. Right and left vertical frames 4a have a quasi-U-shaped cross section with the opening part facing outward, the two top frames 4b and two bottom frames 4b have a quasi-T-shaped cross section with the opening part facing upward or downward, and the two top frames 4b and two bottom frames 4b are connected together while sandwiching right and left vertical frames 4a respectively.
Roller guide assemblies 3 are provided at both end positions of aforementioned two top frame members 4b and two bottom frame members 4b. As shown in
One possible configuration of roller guide assembly 3 will be explained. As shown in
Aforementioned rollers 5a, 5b, and 5c, which roll on guide rail 2, are supported on aforementioned base member 6. That is, three shaft support members 7 are provided upright on base member 6; the respective shaft support member 7 is provided with shaft 8A that faces aforementioned guide rail 2 and can have a horizontal orientation. Said shaft 8A comprises a spindle 8, root portion 12 and arm 13; wherein the spindle 8, which also can have a horizontal orientation, is provided via arm 13 that protrudes above one end of root portion 12; and rollers 5a, 5b, and 5c are supported in a rotatable manner by said spindles 8 respectively. The relationship among these members is shown in the perspective view in
Next, one possible configuration of aforementioned rollers 5a, 5b, and 5c will be explained. Because aforementioned rollers 5a, 5b, and 5c can have the same configuration, only roller 5a will be explained. Roller 5a comprises annular roller periphery 10, roller support part 14 that is fitted inside said annular roller periphery 10, and bearing 9 that is fitted inside said roller support part 14. Aforementioned roller periphery 10 is made of a suitable flexible material such as elastic like rubber or urethane. Aforementioned bearing 9 can have a conventional configuration in that multiple steel balls placed between an inner wing and an outer ring.
Next, configuration of the part that supports aforementioned shaft 8A will be explained based on
In addition, the support part is configured such that shaft 8A, tubular member 11, and shaft support member 7 have limited rotational movement relative to each other. That is, the outer peripheral surface of aforementioned root portion 12, the inner peripheral surface of aforementioned tubular member 11, and the inner peripheral surface of aforementioned shaft support member 7 are formed in a polygonal cross-sectional shape, that is, a square in the present embodiment; and the polygon formed on the inner peripheral surfaces of the respective members functions as a restraining means that restrains the respective members from turning relative to each other. Because aforementioned tubular member 11 and aforementioned shaft support member 7 may need to be joined more firmly, cure adhesion could be utilized in addition to the fitting of the square cross sections together.
According to this invention, because root portions 12 of the shaft 8A are supported by shaft support members 7 via tubular members 11, when rollers 5a, 5b, and 5c are pushed by guide rails 2 to swing, turning forces are applied to root portions 12 via arms 13. Because turning of root portions 12 and tubular members 11 relative to each other at the boundary parts of these members is restrained, the outer peripheral surfaces of tubular members 11 are fixed, and the turning forces from root portions 12 are applied to their inner peripheral surfaces. Thus, although tubular members 11 become twisted due to torsional forces, they return to their original positions as the torsional forces are no longer subsequently applied. When rollers 5a, 5b, and 5c travel over steps formed at joint parts of guide rails 2, because rollers 5a, 5b, and 5c are biased toward guide rails 2 due to the elastic forces of tubular members 11, car 1 is restrained from vibrating; and in the event when an unbalanced load is applied to car 1 for example due to an unbalanced cargo inside car 1, since car 1 is supported by guide rails 2 while tubular members 11 are being twisted, no excessive force is acted upon rollers 5a, 5b, and 5c, so car 1 can be restrained from tilting; and tubular members 11 recover from their twisted state subsequently as the effect of the unbalanced load becomes applicable. Said tubular members 11 achieve a biasing function for biasing rollers 5a, 5b, and 5c toward guide rails 2, a damper function for restraining biased rollers 5a, 5b, and 5c from reciprocating in the biasing direction repeatedly, and a bearing function for supporting rollers 5a, 5b, and 5c.
According to this elevator device and the roller guide assembly, because tubular member 11 is placed between root portions 12 and shaft support member 7 of the swing mechanism in order to provide the restraining means for restraining these members from turning relative to each other at their boundary part, the twisting of tubular member 11 when the lateral force is acted upon shaft 8A and its subsequent returning to its original position as the lateral force is no longer applied are repeated. As such, unlike in the past, there is no need to provide the swing mechanism with any biasing means or a damper, so the space required for installing the components can be reduced when compared to that required in the past. In addition, because only tubular member 11 needs to be placed between root portions 12 and shaft support member 7 of the swing mechanism, the manufacturing cost can be reduced when compared to that of the conventional configuration that involved the biasing means and the damper. Furthermore, demands for the prevention of vibrations of various kinds attributable to different elevator structures and elevator speeds can be met, for example, by altering the hardness of the material of tubular member 11 so as to change the spring constant. Moreover, as the assembly becomes worn or deteriorated over years, only tubular member 11 needs to be replaced without disassembling, assembling, or adjusting the other peripheral parts, so the time spent for maintenance can be reduced.
According to this invention, because the polygonal outer peripheral surface is fitted to the polygonal inner peripheral surface, turning of tubular member 11 with respect to shaft support member 7 is restrained, and turning of root portion 12 with respect to said tubular member 11 is restrained; whereby, when the turning force is acted upon said shaft 8A, tubular member 11 is twisted and then returns to its original position subsequently.
According to this elevator device and the roller guide assembly, because the inner and the outer peripheral surfaces of root portion 12, tubular member 11, and shaft support member 7 are formed in the polygonal cross-sectional shape in order to configure the restraining means, the restraining means can be configured easily. Although shown in
When the combination of roller periphery 10, which could be made of rubber or urethane, and the hardness (spring constant) of tubular member 11 is adjusted, vibrations of car 1 can be restrained under ordinary condition due to the twisting and the restitution of tubular member 11; and in the event car 1 comes to a stop when an emergency stop device is activated, the impact to rollers 5a, 5b, and 5c is mitigated as roller peripheral parts 10 bend.
In particular, the configuration of the part that supports shaft 8A is different. As shown in
As one possible alternative (and as specifically shown in
According to this invention, when projections 11b and 11c of tubular member 11 are fitted into recesses 7b and 12a of shaft support member 7 and root portion 12, turning of tubular member 11 with respect to shaft support member 7 is restrained, and turning of root portion 12 with respect to tubular member 11 is restrained; whereby, tubular member 11 is twisted when a turning force is acted upon said shaft 8A and subsequently returns to its original position.
According to this elevator device and the roller guide assembly, because the restraining means is configured by forming recesses 12a and 7b on the outer peripheral surface of root portion 12 of the shaft 8A and the inner peripheral surface of shaft support member 7, and by forming projections 11b and 11c on tubular member 11, the restraining means can be configured easily. Alternatively, the projections could extend from shaft support member 7 and shaft 8A, and the recesses could be on tubular member 11.
As another possible alternative (or in addition to the aforementioned projections 11b and 11c and the recesses 12a and 7b), an adhesive could be applied at one or more of the contact surfaces of root portion 12, tubular member 11, and shaft support member 7 so as to bond the respective members together in order to enhance the restraining capability of the arrangement.
According to this invention, because the respective members are joined together by the adhesive at the boundary parts, turning of tubular member 11 with respect to shaft support member 7 is restrained, and turning of root portion 12 with respect to tubular member 11 is restrained; whereby, tubular member 11 is twisted when a turning force is acted upon shaft 8A and subsequently returns to its original position.
According to this elevator device and the roller guide assembly, because the restraining means is configured by applying the adhesive at the boundary parts of root portion 12, tubular member 11, and shaft support member 7, the outer peripheral surface of root portion 12 and the inner peripheral surface of shaft support member 7 can be formed in a circular cross-sectional shape, which results in good workability. What is more, because the manufacturing cost is low due to the simple cylindrical shape of rubber 11, the manufacturing costs of the elevator device and the roller guide assembly are also low. Alternatively, however, the adhesive could be used on different shapes of tubular member 11, shaft support member 7 and root portion 12.
While the present invention has been particularly shown and described with reference to the exemplary embodiments as illustrated in the drawings, it will be recognized by those skilled in the art that various modifications may be made without departing from the spirit and scope of the invention as disclosed in the accompanying claims.
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PCT/IB2012/001052 | 5/30/2012 | WO | 00 | 12/11/2013 |
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