Automobile chassis jack
OwnerMurray L. Hauptmaninventor
Life of this patent
Estimating the term…
Abstract
A low profile lifting device having an elongated base, a rotatable shaft extending along said base, an arm having a nut at one end threadably mounted on the shaft and a lifting pad at the other end, means at one end of the base for rotating the shaft, a pair of side levers having one end pivoted to the other end of the base and extending to a pivotal connection at an intermediate portion of the arm, and means for preventing unwanted shaft rotation in response to weight on the lifting pad.
Claims11
In an automobile chassis jack, an elongated base, a shaft extending along said base, a nut mounted on said shaft, means interconnecting said nut and shaft whereby rotation of said shaft will cause axial movement of the nut, a lifting arm pivotally connected at one end to said nut, a lifting pad pivotally mounted at the outer end of said lifting arm, a thrust plate mounted at one end of said base and extending transversely thereacross, a pair of side levers each having one end pivoted adjacent said thrust plate, the opposite ends of said side levers being pivotally connected to an intermediate portion of said lifting arm, means at the end of said base remote from said thrust plate for rotating said shaft in either direction, whereby said lifting pad may be moved between a raised position and a lowered position, the lifting pad in its lowered position being remote from said rotating means whereby the lifting pad may be placed beneath a chassis without the necessity of inserting intermediate portions of the jack beneath the chassis, and means for preventing a load on said lifting pad transmitted to said nut from rotating said shaft.
In a vehicle chassis jack, a base having a channel-shaped cross section with outwardly extending flanges, a thrust plate at one end of said base and extending transversely from both sides thereof, a portion of said thrust plate extending below said base and resting on the ground, a foot adjacent the opposite end of said base, a shaft extending along said base within the channel formed thereby, one end of said shaft extending through said thrust plate, a collar carried by said extending end of the shaft and engageable with thrust bearing means carried by the thrust plate, a nut mounted on the shaft, means connecting the nut and shaft whereby rotation of the shaft will cause the nut to travel axially, a lifting arm having one end pivotally connected to the nut, a lifting pad pivotally connected to the opposite end of said lifting arm, a pair of side levers, one end of each side lever being connected adjacent an outer end of said thrust plate, the side levers being bent inwardly with their opposite ends pivotally connected to an intermediate portion of said lifting arm, a clutch supporting plate mounted at the opposite end of said base, a self-locking clutch carried by said clutch plate, an input element mounted on said self-locking clutch carrying a non-circular crank connection adapted to removably receive a crank, and means connecting the output of said self-locking clutch to said shaft, the self-locking clutch being so constructed as to prevent rotation of said shaft by axial force exerted thereon by said nut.
Dependencies are inferred from the claim text.