Pivotal lift apparatus
OwnerAl L. Valentineinventor
Life of this patent
Estimating the term…
Abstract
Apparatus for lifting a load through an arc includes two pivotally connected, overlapping housings which are pivoted relative to each other by a fluid operated piston disposed between the housings. The housings have overlapping sides provided with oppositely inclined cam tracks. Rollers driven by the piston and captured within the cam tracks transmit force between the sidewalls of the housings, thereby causing the housings to pivot relative to each other. One of the housings is adapted to have the load mounted thereon.
Claims12
Apparatus for effecting pivotal movement of a load comprising:
- a first housing;
- a second housing including means adapted for mounting said load thereon;
- means mounting said second housing for pivotal movement on said first housing about a fixed axis;
- at least a pair of elongate, overlapping cam tracks respectively defined in said first and second housings, said pair of cam tracks extending obliquely relative to each other;
- cam means within said pair of cam tracks for transferring force between said first and second housings causing pivotal movement of said first housing relative to said second housing about said fixed axis in response to displacement of said cam means within said cam tracks;
- and
- motor means carried by and pivotally mounted on said housings and coupled with said cam means for displacing said cam means within said cam tracks to cause pivotal movement of said first housing relative to said second housing about said fixed axis.
Apparatus adapted to pivotally lift a load mounted thereon, comprising:
- an outer housing including a base and a pair of spaced apart, essentially parallel sidewalls extending away from said base;
- an inner housing including a base opposite said base of said outer housing and a pair of spaced apart, essentially parallel sidewalls respectively disposed inboard of and adjacent to the sidewalls of said outer housing,
- one of said inner and outer housings including means for mounting said load thereto;
- a pair of elongate openings in each adjacent pair of sidewalls of said inner and outer housings adjacent one end of said sidewalls, said openings in each pair thereof extending obliquely to and overlapping each other;
- a fluid operated piston and cylinder assembly disposed within said inner and outer housings, said assembly including a reciprocable output rod;
- means mounting said piston and cylinder assembly and said inner and outer housings for pivotal movement relative to each other about a transversely extending common fixed axis defined adjacent the other end of said sidewalls;
- a shaft secured to and extending transversely to said rod;
- and
- cam means secured on opposite ends of said shaft and disposed within said openings, said cam means engaging said sidewalls within said openings and transmitting force to said sidewalls causing said inner housing to pivot about said common fixed axis relative to said outer housing.
Dependencies are inferred from the claim text.