Lifting device

Claim 1

An apparatus for lifting and supporting heavy objects such as truck camper covers and the like comprising, a pair of base members, said base members joined by at least one cross beam member, at least one upstanding support member fixedly mounted to said base member, lever means pivotally mounted on said upstanding support member comprising an L-shaped member having a longer arm and a shorter arm, pivotally mounted at the junction of said longer arm and said shorter arm to an offset projection at the apex of said upstanding support member whereby rotational pressure exerted on said longer arm causes vertical displacement of said shorter arm, said shorter arm of said L-shaped member having spaced attachment means included thereon whereby said load bearing means is adjusted, and having an adjustable load-bearing means coupled to said lever means and locking means pivotally secured to said upstanding support member.

Claim 2

An apparatus for lifting and supporting heavy objects such as truck camper covers and the like comprising, a pair of base members, said base members joined by at least one cross beam member, at least one upstanding support member fixedly mounted to said base member, lever means pivotally mounted on said upstanding support member comprising an L-shaped member having a longer arm and a shorter arm, pivotally mounted at the junction of said longer arm and said shorter arm to an offset projection at the apex of said upstanding support member whereby rotational pressure exerted on said longer arm causes vertical displacement of said shorter arm, said shorter arm of said L-shaped member having spaced attachment means included thereon whereby said load bearing means is adjusted, and having an adjustable load-bearing means coupled to said lever means and locking means pivotally secured to said upstanding support member.

Claim 6

An apparatus for lifting and supporting bulky objects such as truck camper covers and the like comprising at least one base member, at least one upstanding support member fixedly mounted to said base member, lever means pivotally mounted to said upstanding support member, said lever means comprising an L-shaped member having a longer arm and a shorter arm and having a sprocket wheel pivotally mounted at the junction thereof whereby rotational pressure exerted on said L-shaped member causes said sprocket wheel to rotate, adjustable load-bearing means coupled to said lever means, said load-bearing means comprising a sprocket chain having a first and second end, said first end having attachment means for attaching said chain to said load and wherein said second end is fixed to said lever means and wherein said sprocket chain interlocks with said sprocket wheel whereby rotational pressure exerted on said lever means causes vertical displacement of said sprocket chain, and ratchet holding means coupled to said lever means, said ratchet holding means comprising a ratchet wheel having toothed notches fixedly superimposed to said sprocket wheel, a first spring-loaded hinged pawl releasably engaged to said ratchet wheel whereby backward motion of said ratchet wheel is prevented, a second hinged pawl attached to said lever means for engagement with said toothed notches whereby said ratchet wheel is caused to rotate thereby rotating said sprocket wheel whereby displacement is produced in said sprocket chain interlocked thereto.

Claim 7

An apparatus for lifting and supporting bulky objects such as truck camper covers and the like comprising at least one base member, at least one upstanding support member fixedly mounted to said base member, lever means pivotally mounted to said upstanding support member, said lever means comprising an L-shaped member having a longer arm and a shorter arm and having a sprocket wheel pivotally mounted at the junction thereof whereby rotational pressure exerted on said L-shaped member causes said sprocket wheel to rotate, adjustable load-bearing means coupled to said lever means, said load-bearing means comprising a sprocket chain having a first and second end, said first end having attachment means for attaching said chain to said load and wherein said second end is fixed to said lever means and wherein said sprocket chain interlocks with said sprocket wheel whereby rotational pressure exerted on said lever means causes vertical displacement of said sprocket chain, and ratchet holding means coupled to said lever means, said ratchet holding means comprising a ratchet wheel having toothed notches fixedly superimposed to said sprocket wheel, a first spring-loaded hinged pawl releasably engaged to said ratchet wheel whereby backward motion of said ratchet wheel is prevented, a second hinged pawl attached to said lever means for engagement with said toothed notches whereby said ratchet wheel is caused to rotate thereby rotating said sprocket wheel whereby displacement is produced in said sprocket chain interlocked thereto.