ELEVATOR GUIDE

Abstract

An elevator guide having a base attached to an elevator component, a guide riding along a portion of a rail and a spring biasing the guide in contact with the rail. The guide includes one or more of the following: (i) a guide support member operably associated with the guide for movably supporting the guide so that the guide can move toward and away from a corresponding surface of the rail member wherein the guide support member has a plurality of spring engagement sections configured to vary a system effective spring rate; (ii) a roller including a non-metallic rim molded about a bearing; (iii) two independently adjustable stops and, (iv) an opening adjustment member mounted about a notch in the base to vary the distance between the base and the rail. The opening adjustment member has a width and/or depth greater than a width and/or depth of the notch.

Claims

1. An elevator guide configured to ride along an elevator rail having a base member and a rail member, the rail member of the elevator rail having a front face, a first side and a second side, the rail member of the elevator rail further extending substantially perpendicular to the base member of the elevator rail, the elevator guide comprising: (a) a base configured to be attached to a component that rides on one or more elevator rails, a first guide configured to ride along one of a front face, a first side and a second side of a rail member of an elevator rail, a first spring biasing said first guide in contact with said at least one of the front face, the first side and the second side of the rail member of the elevator rail and a first guide support member having a connection portion rotatably connected to said base so that said first guide support member can rotate about an axis relative to said base, said first guide support member further including a guide connection portion for connecting the first guide support member to said first guide for movably supporting said first guide on said base so that said first guide can move toward and away from a corresponding surface of the rail member of the elevator rail; and, (b) said first guide support member being configured to allow a position of said first spring relative to the axis to be varied to vary a system effective spring rate.

2. The elevator guide of claim 1, wherein: (a) said first guide is a roller.

3. The elevator guide of claim 2, wherein: (a) said first spring is mounted about a bolt and said first guide support member includes a plurality of openings wherein each of the plurality of openings are configured to receive the bolt having said first spring mounted about the bolt to vary a system effective spring rate.

4. The elevator guide of claim 3, wherein: (a) said first spring is a coil spring.

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. An elevator guide configured to ride along an elevator rail having a base member and a rail member, the rail member of the elevator rail having a front face, a first side and a second side, the rail member of the elevator rail further extending substantially perpendicular to the base member of the elevator rail, the elevator guide comprising: (a) a base configured to be attached to a component that rides on one or more elevator rails, said base having a notch extending through a front face of said base to receive a portion of the rail member of the elevator rail, said notch having a rear face, a first side face and a second side face, said bottom of said base having an adjustment recess extending along said rear face, said first side face and said second side face of said notch, a first guide configured to ride along one of a front face, a first side and a second side of a rail member of an elevator rail, a first biasing member biasing said first guide in contact with said at least one of the front face, the first side and the second side of the rail member of the elevator rail and a first guide support member having a connection portion connected to said base so that said first guide support member can move relative to said base, said first guide support member further including a guide connection portion for connecting the first guide support member to said first guide for movably supporting said first guide on said base so that said first guide can move toward and away from a corresponding surface of the rail member of the elevator rail; and, (b) a notch adjustment member operably associated with said adjustment recess of said base for adjusting at least one dimension of the base relative to the rail member of the elevator rail.

10. The elevator guide of claim 9, wherein: (a) a first portion of said notch adjustment member is disposed in said adjustment recess of said base and a second portion of said notch adjustment member extends into said notch; and, (b) said notch of said base having at least one alignment member formed in a vertically extending face of said notch for aligning the rail member relative to the base, and wherein said notch adjustment member when attached to said base is vertically offset from said at least one alignment member so that said at least one alignment member is readily visible after said notch adjustment member is attached to said base.

11. The elevator guide of claim 10, wherein: (a) said adjustment recess is substantially U-shaped, said notch is substantially U-shaped and said notch adjustment member is substantially U-shaped.

12. The elevator guide of claim 11, wherein: (a) said notch adjustment member has a width greater than a width of said notch and a depth greater than a depth of said notch.

13. The elevator guide of claim 12, wherein: (a) said notch adjustment member is detachably connected to a bottom of said base and adjusts a plurality of dimensions of the base relative to the elevator rail.

14. (canceled)

15. (canceled)

16. (canceled)

17. An elevator roller guide configured to ride along an elevator rail having a base member and a rail member, the rail member of the elevator rail having a front face, a first side and a second side, the rail member of the elevator rail further extending substantially perpendicular to the base member of the elevator rail, the elevator roller guide comprising: (a) a base configured to be attached to a component that rides on one or more elevator rails, a roller configured to ride along one of a front face, a first side and a second side of a rail member of an elevator rail, a spring biasing said roller in contact with said at least one of the front face, the first side and the second side of the rail member of the elevator rail; (b) said elevator roller guide further including at least one of the following: (i) a roller support member operably associated with said roller for movably supporting said roller so that said roller can move toward and away from a corresponding surface of the rail member wherein said roller support member has a plurality of spring engagement sections configured to allow a position that the spring contacts said roller support member to be varied to vary a system effective spring rate; (ii) a roller including a non-metallic rim molded about a roller bearing and configured to receive a roller tread; (iii) a first stop and a second stop that are independently adjustable and operably associated with a roller support supporting said roller to control movement of said roller; and, (iv) an opening adjustment member detachably connected to a base of the roller guide about a notch formed in the base of the roller guide to receive a portion of the rail member of the elevator rail to vary the distance between the base of the roller guide and a portion of the rail member of the elevator rail, the opening adjustment member has a width greater than a width of said notch or a depth greater than a depth of said notch.

18. The elevator roller guide of claim 17, wherein: (a) said elevator roller guide includes a roller having a non-metallic rim molded about a roller bearing and configured to receive a roller tread, said non-metallic rim is formed from a composite material.

19. The elevator roller guide of claim 18, wherein: (a) said elevator roller guide further includes the opening adjustment member.

20. (canceled)

21. The elevator guide of claim 18, wherein: (a) the composite material is a polyamide and fiberglass blend.

22. The elevator roller guide of claim 19, wherein: (a) said elevator roller guide further includes a roller support member operably associated with said roller for movably supporting said roller so that said roller can move toward and away from a corresponding surface of the rail member wherein said roller support member has a plurality of spring engagement sections configured to allow a position that the spring contacts said roller support member to be varied to vary a system effective spring rate.

23. The elevator roller guide of claim 22, wherein: (a) said elevator roller guide further includes a first stop and a second stop that are independently adjustable and operably associated with the roller support.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a perspective view of an elevator guide formed in accordance with a preferred embodiment of the present invention mounted about an elevator rail.

[0024] FIG. 2 is a partially exploded perspective view of the elevator guide illustrated in FIG. 1.

[0025] FIG. 3 is a partially exploded perspective view of a portion of the elevator guide illustrated in FIG. 1 as seen from a lower vantage point.

[0026] FIG. 4 is a partially exploded perspective view of the elevator guide illustrated in FIG. 1.

[0027] FIG. 5 is a perspective view of the elevator guide illustrated in FIG. 1 taken from a lower vantage point.

[0028] FIG. 6 is a fragmentary, side elevational view of the elevator guide illustrated in FIG. 1.

[0029] FIG. 7 is a perspective view of the elevator guide illustrated in FIG. 1.

[0030] FIG. 8 is a perspective view of a portion of the base of the elevator guide illustrated in FIG. 1.

[0031] FIG. 9 is a bottom view of a portion of the elevator guide illustrated in FIG. 1.

[0032] FIG. 10 is an exploded, fragmentary perspective view of a preferred roller/wheel.

[0033] FIG. 11 is a fragmentary perspective view of a preferred roller/wheel.

[0034] FIG. 12 is a perspective view of a preferred roller/wheel.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION

[0035] The preferred forms of the invention will now be described with reference to FIGS. 1-12. The appended claims are not limited to the preferred forms and no term and/or phrase used herein is to be given a meaning other than its ordinary meaning unless it is expressly stated that the term and/or phrase shall have a special meaning. The term “spring” as used herein shall mean any and all resilient devices that can be pressed or pulled but return to their former shape when released. The term “effective system spring rate” as used herein shall be defined by SK.sub.eff=F/X with “SK.sub.eff” being the effective system spring rate of the system or the assembly having the resilient device(s) in a particular operating position on the elevator guide, F being the force applied to the wheel/roller or other guide member and X being the resultant deflection or movement of the wheel/roller or other guide member away from a corresponding portion of an elevator rail.

[0036] The preferred embodiments illustrate elevator guides that utilize three rollers/wheels as the guide members that guide a component (e.g., an elevator car or counterweight) along opposing elevator rails. However, guide members other than rollers/wheels can be used. Further, the number of rollers/wheels or other guide members can be altered as desired. For example, and without limitation, the elevator guide can include six rollers/wheels or guide members.

FIGS. 1-12

[0037] Referring to FIGS. 1 to 12, a preferred elevator roller guide A and components thereof are illustrated in one of many possible configurations. Referring to FIG. 1, elevator roller guide A is mounted about an elevator rail R. Elevator rail R includes a base member RB and a rail member RR. Rail member RR has a front face 2, a first side 4 and a second side 6. Rail member RR extends perpendicular or substantially perpendicular to the base member RB.

[0038] Elevator roller guide A includes a base B, a face roller or wheel C and pair of side rollers or wheels D. Base B includes a horizontally extending member 8 having four openings 10 that receive fasteners to attach roller guide A to the component that rides along the elevator rails. Base B further includes a pair of vertically extending members or towers 12 and 14.

[0039] Base B further includes three support arm connection portions 16, 18 and 20. Referring to, for example, FIG. 3, base B includes a notch or recess 22 formed in a front face of base B to receive a corresponding portion of rail member RR of an elevator rail R. Preferably, notch 22 is substantially U-shaped. Base B includes a recess 24 formed in a bottom surface 26 of base B. Recess 24 extends along and outwardly from three sides (i.e., left side, right side and rear side) of notch or recess 22 as seen in, for example, FIGS. 3 and 8. Preferably, recess 24 is substantially U-shaped. Preferably, recess 24 has a width and a depth greater than a width and a depth, respectively of notch 22.

[0040] As seen in FIGS. 8 and 9, notch or recess 22 includes alignment members 30, 32 and 34 to allow an individual to properly orient and/or align guide A relative to elevator rail R. Alignment members 30, 32 and 34 can take the form of scores, notches, slots, recesses, indicia or any other suitable alignment mechanism. Referring to FIG. 3, insert 36 is inserted into recess 24 and detachably connected to base member 8 by fasteners 38. Insert 36 is vertically offset from alignment members 30, 32 and 34 so that alignment members 30, 32 and 34 are readily visible from above when the insert to attached to base member 8. Three threaded or non-threaded bores 40 may extend through insert 36 and three threaded openings 42 may be formed in an upper surface of recess 24 to facilitate attachment of insert 36 to base member 8 using fasteners 38. Insert 36 is preferably U-shaped and preferably extends inwardly from left side, right side and rear side of notch 22 to vary the width dimension and depth dimension of notch 22. More specifically, insert 36 preferably decreases each of the following: (i) the spacing between base B and front face 2 of rail member RR; (ii) the spacing between base B and the side face 4 of rail member RR; and, (iii) the spacing between base B and the side face 6 of rail member RR. However, it will be readily appreciated that insert 36 can be configured to only vary the spacing between base B and front face 2. Alternatively, insert 36 can be configured to only vary the spacing between base B and side faces 4 and 6 or only between base B and face 4 or only between base B and face 6. For example, insert 36 can be configured such that portions of insert 36 corresponding to the right side and rear side of notch 22 are vertically aligned with the right side and rear side of notch 22, while the portion corresponding to the left side of notch 22 extends inwardly from the left side of notch 22.

[0041] Guide A includes support arms 50, 52 and 54 pivotally mounted on connection portions 16, 18 and 20, respectively of base B. Support arms 50, 52 and 54 each pivot about an axis to allow the corresponding guide member to move towards and away from the corresponding portion of rail member RR. Support arms 50, 52 and 54 are preferably identical or similar in construction so only support arm 50 will be discussed in detail.

[0042] Referring to, for example, FIGS. 2 to 4, support arm 50 includes three vertically spaced openings 56, 58 and 60 for receiving shaft 62 of a bolt 64 having a threaded inner end onto which a nut 65 can be threaded on. Openings 56, 58 and 60 are sized to be sufficiently larger than the diameter of shaft 62 to allow support arm 50 to move a predetermined distance away from and towards tower 12. A circular recess 66 can surround each of openings 56, 58 and 60 to receive an inner portion/end of spring 68. Tower 12 includes three vertically spaced internally threaded openings 70, 72 and 74 that are horizontally aligned with openings 56, 58 and 60, respectively to receive a threaded innermost end of shaft 62. Openings 70, 72 and 74 can extend partially or completely through tower 12.

[0043] Arm 50 includes a substantially U-shaped lower end 80 having spaced legs 82 and 84 each having an opening 86 that extends through the corresponding leg. Legs 82 and 84 are spaced from each other a sufficient distance to receive connection member 16 of base member 8. A bore extends through connection member 16. A pin or fastener 90 extends into openings 86 of each of legs 82 and 84 and the through bore of member 16 to rotatably connect lower end 80 of support arm 50 to base member 8. This configuration allows support arm 50 to rotate about a longitudinal axis of pin or fastener 90.

[0044] Support arm 50 further includes vertically spaced stop openings 92 and 94 each extending through support arm 50. Tower 12 includes internally threaded, vertically spaced openings 93 and 95. Openings 93 and 95 can extend partially or completely through tower 12. Openings 93 and 95 are horizontally aligned with stop openings 92 and 94, respectively. Stop opening 92 receives a shaft 100 of bolt 102. An inner end of shaft 100 is threaded to allow an inner end to be threaded through nut 103 and into opening 93 of tower 12 to adjustably fix bolt 102 to tower 12. A washer 104 is mounted on shaft 100 adjacent or in direct contact with bolt head 106. A rubber or elastomeric skin or layer can be formed on or attached to the innermost vertically extending surface of washer 104. Preferably, the rubber or elastomeric skin/layer has a thickness of approximately 1/16 of an inch. However, the thickness of the rubber or elastomeric skin/layer may be varied as desired. The rubber or elastomeric skin/layer maintains washer 104 in a desired position on shaft 100 as the rubber or elastomeric skin/layer is configured to grip the outer circumference of shaft 100 of bolt 102.

[0045] A circular recess 110 preferably surrounds opening 94 in support arm 50 to receive an inner portion of resilient member 112 which is mounted about shaft 114 of bolt 116 adjacent or in direct contact with bolt head 118. Preferably, resilient member 112 is configured to compress approximately ¼ of an inch. However, the extent to which resilient member 112 can be compressed may be varied as desired. Resilient member 112 can be formed to have two spaced conically or cylindrically shaped face members 120 and 122 and an inner cylindrical member 124 extending between face members 120 and 122. Cylindrical member 124 can have a diameter less than an outermost diameter of each of members 120 and 122. Face members 120 and 122 may be formed from metal, plastic or an elastomeric/resilient material and member 124 can be formed from rubber, an elastic material or other resilient material. Inner through bores of members 120, 122 and/or 124 when formed from a suitable material can be configured to grip shaft 114 to maintain resilient member 112 on a desired portion of shaft 114. An inner end of shaft 114 is inserted through opening 94, through nut 130 and into opening 95 formed in tower 12 to adjustably attach bolt 116 to tower 12.

[0046] Support arm 50 includes a wheel or roller mount portion 140 having an internally threaded bore. A bolt 142 and washer 144 rotatably connect roller/wheel D to portion 140 of support arm 50.

[0047] Referring to FIGS. 10 to 12, a preferred form of wheel/roller will now be described. Preferably, wheels/roller C and D are identical in construction. Therefore, only roller/wheel D will be described in detail. Roller/wheel D includes a tread 150, a non-metallic rim 152 and a bearing 154 having an inner race 156 mounted about the shaft of bolt 142 and an outer race 158 fixed to rim 152. Bearing 154 includes a plurality of bearing members positioned between inner race 156 and outer race 158 so that outer race 158 can rotate relative to inner race 156. Preferably, bearing 154 is attached to non-metallic rim 152 during formation of rim 152. For example, rim 152 can be formed from injection molding or other suitable molding process. Bearing 154 can be inserted into a form or mold utilized to form rim 152 by molding. Preferably, rim 152 is formed from a composite material. In a most preferred form, the composite material is a polyamide and fiberglass blend. However, rim 152 could be formed from a single material (e.g., polyamide or any other suitable material). During the molding process forming rim 152, rim 152 is preferably permanently fixed to outer race 158 so that rim 152 and outer race 158 move together. As seen in FIG. 10, rim 152 has inner sidewalls 160 and 162 formed about the sidewalls 164 and 166, respectively of outer race 158. Rim 152 further includes an inner cylindrical surface 163 extending between inner sidewalls 160 and 162 and formed about cylindrical surface 167 of outer race 158. The inner sidewalls 160 and 162 of rim 152 are preferably adhered to the sidewalls 164 and 166 of outer race 158, respectively during the molding process forming rim 152. Inner cylindrical surface 163 of rim 152 is preferably adhered to cylindrical surface 167 of outer race 158 during the molding process forming rim 152.

[0048] While the above described process of molding rim 152 results in rim 152 being formed as a single piece, rim 152 can be formed in multiple pieces (i.e., two or more pieces or parts) of a composite material and then attached to rim 152 after formation of the multiple pieces making up rim 152.

[0049] The cylindrical contact surface 170 of tread 150 is preferably formed with a roundness/circular dimension within a tolerance of 3 thousandths of an inch or less. The other dimensions of tread 150 and rim 152 are preferably formed within a tolerance of 10 thousandths of an inch or less. The inclined opposing sidewalls 172 of tread 150 extending downwardly at an angle from contact surface 170 are preferably equally spaced from a vertical plane passing through a center of tread 150.

[0050] Elevator guide A includes three independently adjustable systems that utilize a spring 68 to control movement of a corresponding wheel/roller away from a corresponding portion of an elevator rail. Support arm 50, roller D held by support arm 50 and spring 68 acting on support arm 50 form one independently adjustable system, support arm 52, roller C held by support arm 52 and spring 68 acting on support arm 52 form another independently adjustable system and support arm 54, roller D held by support arm 54 and spring 68 acting on support arm 54 form another independently adjustable system. Each of support arms 50, 52 and 54 is configured in the manner described above in connection with support arm 50 to vary the effective system spring rate of a given system merely by altering the vertical distance between spring 68 and the pivot point of the corresponding support arm which in turn alters the vertical distance of spring 68 from a center of a corresponding roller/wheel. Specifically, if spring 68 and bolt 64 are connected to tower 12 and support arm 50 using opening 60 in support arm 50 and opening 74 in tower 12, the system including support arm 50 will have an effective system spring rate X. If spring 68 and bolt 64 are connected to tower 12 and support arm 50 using opening 58 in support arm 50 and opening 72 in tower 12, the system including support arm 50 will have an effective system spring rate Y. If spring 68 and bolt 64 are connected to tower 12 and support arm 50 using opening 56 in support arm 50 and opening 70 in tower 12, the system including support arm 50 will have an effective system spring rate Z. Effective system spring rate X is less than effective system spring rate Y and effective system spring rate Y is less than effective system spring rate Z, i.e., the closer spring 68 is to the pivot point of support arm 50 the less the effective system spring rate will be due to the resultant increase in the vertical distance/spacing of spring 68 from a center of wheel or roller D.

[0051] The preferred design of support arms 50, 52 and 54 also allows an individual to readily vary the effective system spring rate of each of the three above described systems merely by selecting different openings of the openings 56, 58 and 60 to connect spring 68 to support arm 52 and spring 68 to either of support arms 50 and 54. This is readily seen in FIG. 1, where spring 68 acting on support arm 52 utilizes the lower opening 60 and spring 68 acting on support arm 50 utilizes upper opening 56. The effective system spring rate of the system including support arm 52 is less than the effective system spring rate of the system including support arm 50 having a spring identical to the spring acting on support arm 52.

[0052] Bolt 116, resilient member 120 and nut 130 form an adjustable soft stop that limits the distance support arm 50 can move away from face 4 of rail member RR. By threading bolt 116 further into opening 95 of tower 12, one can readily lessen the distance between bolt head 118 and tower 12 which in turn lessens the distance support arm 50 can move away from support arm 50 when resilient member 120 is fully compressed. Further, by rotating the bolt in the opposite direction, one can readily increase the distance between bolt head 118 and tower 12 which in turn increases the distance support arm 50 can move away from support arm 50 when resilient member 120 is fully compressed. Resilient member 120 acts to cushion the impact of the stop as the resilient member preferably compresses approximately a quarter of an inch. However, the distance resilient member 120 can be compressed may be varied as desired. Accordingly, once support arm initially engages resilient member 120, support arm 50 can still move outwardly the distance or extent the resilient member 120 can fully compressed (e.g. a quarter of an inch).

[0053] Bolt 102, washer 104 and nut 103 form another adjustable hard stop that limits the distance support arm 50 can move away from face 4 of rail member RR. The stop formed by bolt 102, washer 104 and nut 103 is adjustable independent of the stop formed by bolt 116, resilient member 120 and nut 130.

[0054] The above two independently adjustable stops have differing stop action ranges (i.e., the stop action range is the range from initial contact of guide support arm with a stop portion of a corresponding adjustable stop to a final contact point at which movement of the guide support arm away from the corresponding face of the elevator rail is prevented by the corresponding adjustable stop). More specifically, the stop action range of the adjustable stop formed by bolt 102, washer 104 and nut 103 is less than the stop action range of the adjustable stop formed by bolt 116, resilient member 120 and nut 130. The stop action range of the adjustable stop formed by bolt 102, washer 104 and nut 103 will be very minimal as the only resilient or compressible element of this adjustable stop is a thin elastomeric layer/skin (e.g., 1/16 of an inch) applied or adhered to an inner face of washer 104. The stop action range of the adjustable stop formed by bolt 102, washer 104 and nut 103 could be less than a 1/16 of an inch or could be zero. The stop action range of the adjustable stop formed by bolt 116, resilient member 120 and nut 130, will be equal to or approximately equal to the distance resilient member 120 can be compressed.

[0055] The fact that the two stops described above can be independently adjusted is a significant advantage over previously known dual stops that cannot be independently adjusted, i.e., adjustment of one stop causes or results in adjustment of the other stop. Specifically, an elevator car has a range of motion which varies based on the design of an elevator. The range of motion of the elevator car must be controlled to prevent the car from impacting an object in the elevator car which could damage the elevator car and greatly reduce ride quality. Hard stops, i.e., stops having zero or very minimal stop action ranges can be used to restrict movement of the elevator car to prevent the elevator car from striking an object in an elevator shaft that could damage the elevator car. However, a hard stop will exert a significant and abrupt force on the elevator car adversely impacting ride quality of the elevator car. A soft stop, i.e., a stop having a sufficient action range (e.g., a quarter of an inch) will control movement of the elevator car by exerting a gradual force on the elevator car. However, due to the numerous different designs of elevators, the range of motion of a given elevator car varies. Hard and soft stops that have been previously used are not independently adjustable and, therefore, do not allow the necessary flexibility to set or orient the hard stop relative to the soft stop to achieve a superior ride quality while preventing damage to an elevator car to accommodate the varying conditions of elevators.

[0056] The independently adjustable soft and hard stops of the present invention provide a great deal of flexibility in setting and/or orienting the hard stop relative to the soft stop to ensure superior ride quality while preventing damage to an elevator car. For example, the soft stop of the subject invention (i.e., the stop formed by bolt 116, resilient member 120 and nut 130) can be set to be very close to or in contact with support arm 50 to accommodate those instances where greater control on the support arm 50 is desired. In prior art devices, inward movement of the soft stop to be close to or in contact with the support arm would move the hard stop unnecessarily close to support art 50 so that the frequency support arm 50 impacts the hard stop would increase considerably significantly reducing ride quality as the hard stop exerts a significant and abrupt force on the elevator car. Because the hard stop of the preferred embodiment (i.e., the stop formed by bolt 102, washer 104 and nut 103) can be adjusted independent of the soft stop, the hard stop can be positioned a sufficient distance from support arm 50 that will prevent the elevator car from being damaged while significantly reducing the frequency that support arm 50 impacts the hard stop. This is just one of many instances where the independently adjustable stops of the preferred embodiment can be used to significantly improve ride quality.

[0057] The independently adjustable stops of the preferred embodiment also allow the soft stop to be positioned relative to the hard stop so that the only time arm 50 would impact the hard stop is if the soft stop became damaged where the soft stop could function as a stop to prevent damage to the elevator car.

[0058] The independently adjustable stops of the preferred embodiment further allow the hard stop to be positioned relative to soft stop to vary the extent to which the resilient member 120 of the soft stop can compress. For example, where resilient member 120 can be compressed by W, but in a particular application or environment in which roller guide A is used, resilient member 120 should only be compressed a fraction of W, the hard stop can be set to prevent any further outward movement of arm 50 once resilient member 120 has been compressed the desired fraction of W.

[0059] The independently adjustable stops of the preferred embodiment further allow adjustment of the stops so that the stops can act in parallel or series and/or a combination of series and parallel.

[0060] While this invention has been described as having a preferred design, it is understood that the preferred design can be further modified or adapted following in general the principles of the invention and including but not limited to such departures from the present invention as come within the known or customary practice in the art to which the invention pertains. The claims are not limited to the preferred embodiment and have been written to preclude such a narrow construction using the principles of claim differentiation.