Braking device for elevating platform assembly
AssigneeHydro Mobile
InventorGérard Noel
Life of this patent
Estimating the term…
Abstract
A braking device for an elevated platform assembly comprising a platform moveable along a generally vertical mast supporting an upright rack comprises an input gear assembly in mating engagement with the rack, a centrifugal actuator communicating with the input assembly and a spring-loaded brake responsive to the centrifugal actuator. The spring-loaded brake engages the rack and arrests the platform when the platform descends the mast at a rate above an upper threshold limit.
Claims30
A braking device for an elevating platform assembly, said elevating platform assembly comprising a platform moveable along a generally vertical mast supporting an upright rack, said braking device comprising:
- an input gear assembly in mating engagement with said rack;
- a centrifugal actuator communicating with said input gear assembly and comprising a trigger mechanism;
- and
- a spring-loaded brake responsive to said centrifugal actuator to engage said rack and arrest said platform when said platform descends said mast at a rate above an upper threshold limit resulting in release of said trigger mechanism, said spring-loaded brake automatically resetting said trigger mechanism as downward movement of said platform is arrested.
An elevating platform comprising:
- at least one mast;
- a vertical rack on said at least one mast;
- an elongate platform coupled to said at least one mast and moveable therealong;
- a drive mechanism acting between said platform and said mast to effect movement of said platform along said mast;
- and
- an emergency braking device on said platform and engaging said rack, said emergency braking device comprising:
- an input gear assembly in mating engagement with said rack;
- a centrifugal actuator communicating with said input gear assembly and comprising a trigger assembly;
- and
- a spring-loaded brake responsive to said centrifugal actuator to engage said rack and arrest said platform when said platform descends said mast at a rate above an upper threshold limit resulting in release of said trigger assembly, said spring-loaded brake automatically resetting said trigger mechanism as downward movement of said platform is arrested.
A braking device for an elevating platform assembly, said elevating platform assembly comprising a platform moveable along a generally vertical mast supporting an upright rack, said braking device comprising:
- an input gear assembly in mating engagement with said rack;
- a centrifugal actuator communicating with said input gear assembly;
- and
- a spring-loaded brake responsive to said centrifugal actuator to engage said rack and arrest said platform when said platform descends said mast at a rate above an upper threshold limit, said spring-loaded brake comprising a braking rack to engage the rack on said mast and a linearly slidable push block acting on said braking rack, wherein said push block presents an upwardly and forwardly inclined surface that acts on a complimentary surface of said braking rack.
A braking device for an elevating platform assembly, said elevating platform assembly comprising a platform moveable along a generally vertical mast supporting an upright rack, said braking device comprising:
- an input gear assembly in mating engagement with said rack;
- a centrifugal actuator communicating with said input gear assembly and comprising a trigger mechanism;
- and
- a spring-loaded brake responsive to said centrifugal actuator to engage said rack and arrest said platform when said platform descends said mast at a rate above an upper threshold limit, said spring-loaded brake automatically resetting said trigger mechanism as downward movement of said platform is arrested, wherein said trigger mechanism comprises a lever coupled adjacent one end to said spring-loaded brake, said lever having a keeper adjacent its opposite end that is retained by a latch of said input gear assembly, said latch being released when the rate of descent of said elevating platform is above said upper threshold limit thereby to cause said trigger mechanism to release said spring-loaded brake.
Dependencies are inferred from the claim text.