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US 4,591,029 AGranted
Load actuating braking apparatus
OwnerJohn P. Da Foeinventor
Life of this patent
Estimating the term…
Abstract
An apparatus to facilitate lifting of heavy loads. The apparatus provides for a hand operated crank which rotates an input shaft which in turn rotates an output shaft which causes lifting of the load. The load would normally be mounted on a platform or other similar type of supporting structure. The apparatus includes a brake assembly which, upon stopping of supplying of the input torque, the brake assembly would automatically hold the load in its lifted position. Also, if the operator wishes to lower the load, reverse rotation of the input shaft will cause the load to be lowered.
Claims3
A load actuating braking apparatus comprising:
- an output shaft, said output shaft being under continuous torque tending to rotate said output shaft in a counterclockwise direction;
- an input shaft, said output shaft being connected by connection means to said input shaft, clockwise rotation of said input shaft causes clockwise rotation of said output shaft;
- a movable housing located about said output shaft and said input shaft;
- a brake assembly located about said output shaft, said brake assembly having a brake pad assembly, said brake pad assembly being movable between a total braking position and a partial braking position, said brake pad assembly being located in tight contact with said movable housing when in said total braking position which is when said input shaft is rotated clockwise and when no input torque is being applied to said input shaft;
- an actuation mechanism connected between said output and input shafts and said brake pad assembly, rotation of said input shaft counterclockwise causes said actuation mechanism to move said brake pad assembly to said partial braking position, whereby said brake pad assembly rotates counterclockwise relative to said movable housing and said output shaft also rotates counterclockwise;
- and
- said connection means comprising a pin being fixedly mounted to said output shaft, said output shaft being mounted within said input shaft in a close conforming manner, an elongated slot being formed within said input shaft, said pin being locatable within said elongated slot, relative movement between said output shaft and said input shaft being limited by the length of said elongated slot.
4 more elements
A load actuating braking apparatus comprising:
- an output shaft, said output shaft being under continuous torque tending to rotate said output shaft in a counterclockwise direction;
- an input shaft, said output shaft being connected by connection means to said input shaft, clockwise rotation of said input shaft causes clockwise rotation of said output shaft;
- a movable housing located about said output shaft and said input shaft;
- a brake assembly located about said output shaft, said brake assembly having a brake pad assembly, said brake pad assembly being movable between a total braking position and a partial braking position, said brake pad assembly being located in tight contact with said movable housing when in said total braking position which is when said input shaft is rotated clockwise and when no input torque is being applied to said input shaft;
- an actuation mechanism connected between said output and input shafts and said brake pad assembly, rotation of said input shaft counterclockwise causes said actuation mechanism to move said brake pad assembly to said partial braking position, whereby said brake pad assembly rotates counterclockwise relative to said movable housing and said output shaft also rotates counterclockwise;
- and
- said brake pad assembly comprising a plurality of brake pads, each said brake pad being pivotly mounted by a pivot pin onto said input shaft, said output shaft including cam means, said cam means to connect with said brake pad assembly being located in said total braking position, said cam means physically contacting each of said brake pads tightly pressing same against said movable housing, location of said brake pad assembly in said partial braking position moves said cam means relative to said brake pad assembly permitting said brake pads not being tightly pressed against said movable housing.
4 more elements
Dependencies are inferred from the claim text.