Patent ID: 6189863
Filing Date: 2001-02-20
Classification: B66F

Abstract:
A jack, comprising:a lifting base provided with an axially disposed receiving opening;a lifting accessory having an axially extending stem defining a first diameter;an end collar connected to one end of said axial stem of said lifting accessory and defining a first portion having a second diameter that is larger than said first diameter of said stem of said lifting accessory, said end collar being received in said receiving opening, said end collar defining a flattened side surface forming a second portion with a diameter smaller than said second diameter;a locking pin installed in said lifting accessory and extending transversely through an edge of said receiving opening;wherein said end collar is configured and disposed to permit said lifting accessory to be selectively rotated clockwise between a first orientation in which said flattened side surface of said end collar can bypass said locking pin during axial movement of said lifting accessory relative to said lifting base and a second orientation in which said lifting accessory is prevented from axial movement relative to said base due to said first portion of said end collar being prevented from bypassing said locking pin and said end collar is configured and disposed to permit said lifting accessory to be selectively rotated counterclockwise between a first orientation in which said flattened side surface of said end collar can bypass said locking pin during axial movement of said lifting accessory relative to said lifting base and a third orientation in which said lifting accessory is prevented from axial movement relative to said base due to said first portion of said end collar being prevented from bypassing said locking pin.