A scissor lift includes a base, a platform, a plurality of pivotally connected scissor links, a support column, and a locking actuator. The platform has a fixed horizontal orientation and being movable between a first elevation and a second elevation. The scissor links are arranged in a crisscross p
A scissor lift includes a base, a platform, a plurality of pivotally connected scissor links, a support column, and a locking actuator. The platform has a fixed horizontal orientation and being movable between a first elevation and a second elevation. The scissor links are arranged in a crisscross pattern and operatively connecting the base and the platform. The lift actuator is pivotally attached to at least one of the scissor links to selectively raise and lower the platform along a lift path. The support column extends alongside the lift path and positioned adjacent to the platform. The locking actuator is fixed to an underside of the platform and includes a piston member extendable toward the support column to operatively connect the platform with the support column when the platform is raised at the second elevation so that the platform is supported by the support column in the fixed horizontal orientation.
대표청구항▼
1. A scissor lift comprising: a base;a platform having a fixed horizontal orientation and being movable between a first elevation and a second elevation;a plurality of pivotally connected scissor links arranged in a crisscross pattern and operatively connecting the base and the platform;a lift actua
1. A scissor lift comprising: a base;a platform having a fixed horizontal orientation and being movable between a first elevation and a second elevation;a plurality of pivotally connected scissor links arranged in a crisscross pattern and operatively connecting the base and the platform;a lift actuator pivotally attached to at least one of the scissor links to selectively raise and lower the platform along a lift path;a support column extending alongside the lift path and positioned adjacent to the platform;a locking actuator fixed to an underside of the platform, the locking actuator comprising a piston member extendable toward the support column to operatively connect the platform with the support column when the platform is raised at the second elevation so that the platform is supported by the support column in the fixed horizontal orientation; anda locking receptacle carried by the support column, wherein the piston member is received within the locking receptacle when the platform is operatively connected to the support column,wherein each of the plurality of the scissor links pivots about a first axis of a plurality of respective first axes and the piston member moves reciprocally along a second axis, wherein the second axis is not parallel with any of the first axes. 2. The scissor lift of claim 1, wherein each first axis is perpendicular to the second axis. 3. The scissor lift of claim 1, further comprising: a second support column positioned adjacent to the platform and extending at least between the first elevation and the second elevation;a first locking receptacle positioned along the first support column and including a first opening;a second locking receptacle positioned along the second support column and including a second opening; anda second locking actuator fixed to the underside of the platform and including a second piston member extendable into the second opening of the second locking receptacle,wherein the first and second locking receptacles define a third axis, the third axis being non-parallel to each of the first axes. 4. A lift comprising: a platform movable between at least a first elevation and a second elevation;a lift mechanism configured to selectively raise the platform from the first elevation to the second elevation;a first locking receptacle positioned at the second elevation, the first locking receptacle including a first opening and a first seating surface;a first locking actuator fixed to an underside of the platform, the first locking actuator comprising a first piston member extendable into the first opening of the first locking receptacle when the platform is at the second elevation;wherein the first locking receptacle further comprises:an electronic position sensor assembly arranged to sense when the piston member is extended into the locking receptacle and separately to sense when the first piston member is seated on the first seating surface,wherein the electronic position sensor assembly comprises a single position sensor, wherein the single position sensor, in combination with a controller that controls actuation of the lift mechanism, senses when the first piston member is extended into the locking receptacle and separately senses when the first piston member is seated on the first seating surface,wherein the single position sensor comprises: a sensor arm, the sensor arm being rotatable and biased by a spring to an at-rest position; anda proximity sensor arranged to sense when the sensor arm is disposed at the at-rest position,wherein a first movement of the sensor arm away from the at-rest position to an engaged position indicates that the first piston member is extended into the first locking receptacle, andwherein a second movement of the sensor arm back from the engaged position to the at-rest position indicates that the first piston member is seated on the first seating surface. 5. The lift of claim 4, further comprising: wherein the first locking actuator comprises a first hydraulic cylinder that moves the piston member; anda pressure switch arranged to detect when the first piston member is fully extended relative to the first hydraulic cylinder,wherein the electronic sensor assembly and the pressure switch provide redundant confirmation that the first piston member is fully extended. 6. The lift of claim 4, further comprising: a second locking receptacle positioned at the second elevation, the second locking receptacle including a second opening; anda second locking actuator fixed to the underside of the platform, the second locking actuator comprising a second piston member extendable into the second opening of the second receptacle when the platform is at the second elevation,wherein the first locking receptacle is positioned on a first support structure positioned adjacent the platform at the second elevation, andwherein the second locking receptacle is positioned on a second support structure positioned adjacent the platform at the second elevation. 7. The lift of claim 6, wherein the first support structure comprises a first column positioned adjacent the platform and extending between the first elevation and the second elevation, andwherein the second support structure comprises a second column positioned adjacent the platform and extending between the first elevation and the second elevation. 8. The lift of claim 4, wherein the lift mechanism is a scissor lift comprising a plurality of pivotally connected scissors links arranged in a crisscross pattern and a hydraulic lift actuator operatively connected to the scissor links so as to cause the scissor links to unfold and fold in order to respectively raise and lower the platform. 9. A method of operating a lift including a platform and an actuator fixed to an underside of the platform, the actuator including an extendable piston member, the method comprising: raising the platform from a first elevation to a second elevation;extending the piston member through an opening formed in a locking receptacle;sensing with an electronic sensor assembly that the piston member has been extended into the locking receptacle;lowering the platform to a third elevation located between the first elevation and the second elevation, so that the piston member is moved into contact with a seating surface formed by the receptacle; andsensing that the piston member is seated on the seating surface with the electronic sensor assembly. 10. The method of claim 9, further comprising: sensing when the piston is fully extended with a pressure switch operatively connected to a hydraulic cylinder arranged to operate the piston member, thereby providing a redundant confirmation that the piston member has been extended into the locking receptacle. 11. A lift comprising: a platform movable between at least a first elevation and a second elevation;a lift mechanism configured to selectively raise the platform from the first elevation to the second elevation;a first locking receptacle positioned at the second elevation, the first locking receptacle including a first opening and a first seating surface;a first locking actuator fixed to an underside of the platform, the first locking actuator comprising a first piston member extendable into the first opening of the first locking receptacle when the platform is at the second elevation;wherein the first locking receptacle further comprises:an electronic position sensor assembly arranged to sense at least one of the following: (a) when the piston member is extended into the first locking receptacle, or (b) when the first piston member is seated on the first seating surface,wherein the first locking actuator comprises a first hydraulic cylinder that moves the piston member; anda pressure switch arranged to detect when the first piston member is fully extended relative to the first hydraulic cylinder,wherein the electronic sensor assembly and the pressure switch provide redundant confirmation that the first piston member is fully extended. 12. The lift of claim 11, wherein the electronic position sensor assembly comprises a single position sensor, wherein the single position sensor, in combination with a controller that controls actuation of the lift mechanism, senses (a) when the first piston member is extended into the locking receptacle and (b) when the first piston member is seated on the first seating surface. 13. The lift of claim 12, wherein the single position sensor comprises: a sensor arm, the sensor arm being rotatable and biased by a spring to an at-rest position; anda proximity sensor arranged to sense when the sensor arm is disposed at the at-rest position,wherein a first movement of the sensor arm away from the at-rest position to an engaged position indicates that the first piston member is extended into the first locking receptacle, andwherein a second movement of the sensor arm back from the engaged position to the at-rest position indicates that the first piston member is seated on the first seating surface. 14. The lift of claim 11, further comprising: a second locking receptacle positioned at the second elevation, the second locking receptacle including a second opening; anda second locking actuator fixed to the underside of the platform, the second locking actuator comprising a second piston member extendable into the second opening of the second receptacle when the platform is at the second elevation,wherein the first locking receptacle is positioned on a first support structure positioned adjacent the platform at the second elevation, andwherein the second locking receptacle is positioned on a second support structure positioned adjacent the platform at the second elevation. 15. The lift of claim 14, wherein the first support structure comprises a first column positioned adjacent the platform and extending between the first elevation and the second elevation, andwherein the second support structure comprises a second column positioned adjacent the platform and extending between the first elevation and the second elevation. 16. The lift of claim 11, wherein the lift mechanism is a scissor lift comprising a plurality of pivotally connected scissors links arranged in a crisscross pattern and a hydraulic lift actuator operatively connected to the scissor links so as to cause the scissor links to unfold and fold in order to respectively raise and lower the platform. 17. A lift comprising: a platform movable between at least a first elevation and a second elevation;a lift mechanism configured to selectively raise the platform from the first elevation to the second elevation;a first locking receptacle positioned at the second elevation, the first locking receptacle including a first opening and a first seating surface;a first locking actuator fixed to an underside of the platform, the first locking actuator comprising a first piston member extendable into the first opening of the first locking receptacle when the platform is at the second elevation;wherein the first locking receptacle further comprises:an electronic position sensor assembly arranged to sense at least one of the following: (a) when the piston member is extended into the locking receptacle, or (b) when the first piston member is seated on the first seating surface;a second locking receptacle positioned at the second elevation, the second locking receptacle including a second opening; anda second locking actuator fixed to the underside of the platform, the second locking actuator comprising a second piston member extendable into the second opening of the second receptacle when the platform is at the second elevation,wherein the first locking receptacle is positioned on a first support structure positioned adjacent the platform at the second elevation, andwherein the second locking receptacle is positioned on a second support structure positioned adjacent the platform at the second elevation,wherein the first support structure comprises a first column positioned adjacent the platform and extending between the first elevation and the second elevation, andwherein the second support structure comprises a second column positioned adjacent the platform and extending between the first elevation and the second elevation. 18. The lift of claim 17, wherein the electronic position sensor assembly comprises a single position sensor, wherein the single position sensor, in combination with a controller that controls actuation of the lift mechanism, senses (a) when the first piston member is extended into the first locking receptacle and (b) when the first piston member is seated on the first seating surface. 19. The lift of claim 18, wherein the single position sensor comprises: a sensor arm, the sensor arm being rotatable and biased by a spring to an at-rest position; anda proximity sensor arranged to sense when the sensor arm is disposed at the at-rest position,wherein a first movement of the sensor arm away from the at-rest position to an engaged position indicates that the first piston member is extended into the first locking receptacle, andwherein a second movement of the sensor arm back from the engaged position to the at-rest position indicates that the first piston member is seated on the first seating surface. 20. The lift of claim 17, further comprising: wherein the first locking actuator comprises a first hydraulic cylinder that moves the piston member; anda pressure switch arranged to detect when the first piston member is fully extended relative to the first hydraulic cylinder,wherein the electronic sensor assembly and the pressure switch provide redundant confirmation that the first piston member is fully extended. 21. The lift of claim 17, wherein the lift mechanism is a scissor lift comprising a plurality of pivotally connected scissors links arranged in a crisscross pattern and a hydraulic lift actuator operatively connected to the scissor links so as to cause the scissor links to unfold and fold in order to respectively raise and lower the platform.
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