Low profile jack construction

Details Low profile jack construction Low profile jack construction

B - Operations, Transporting

66

F

254/132

B66F 3/02 (2006.01)

Patent

CA 1216840

LOW PROFILE JACK CONSTRUCTION Abstract of the Disclosure A mechanical jack construction is provided com- prising a load-bearing rack which is adapted to be moved in the vertical plane by an engaging pinion. The pinion is connected to a lever-driven ratchet wheel by means of shear pins. Application of an excessive load to the load-bearing rack will result in fracture of the shear pins, dis- engagement of the pinion from the ratchet wheel and sub- stantially instantaneous lowering of the rack. Such con- struction lends itself to use in track repair and similar applications in which immediate jack retraction is desired upon engagement of excessive loads.

461850

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