US 4,068,762 A · Pickup truck derrick

Abstract

A collapsible boom and derrick hoist assembly, including a base frame securable to the side rails of a conventional pickup truck. A collapsible A-frame supports a foldable, two-piece boom assembly. A boom swing mechanism includes a gear driven arrangement for rotating the boom or yawing the boom about its vertical axis. A boom elevating mechanism including a winch, cable, and a pivotally supported pulley permits elevation of the erected two-piece boom with the elevation angle remaining constant as the boom swings about its vertical axis. An A-frame erection subassembly including a strut arrangement for obtaining a mechanical advantage is provided along with a boom erection and winching cable arrangement. A plurality of screw jacks are pivotally connected to side members of the base frame and serve to support the derrick hoist assembly and stabilize the assembly during operation.

Claims25

Dependent claims

A collapsible boom and derrick hoist assembly removably mountable on a vehicle, comprising:

a base frame adapted for mounting on a vehicle;
a derrick frame supported on said base frame for movement from a collapsed, transporting position to an erected operating position and including a leg pivotally connected to said base frame, said derrick frame having a boom mounting plate at one end thereof;
a foldable boom assembly having a hoisting section and a counterbalance section;
hoist means on said derrick frame and said boom for hoisting articles;
trunnion means rotatably secured to said boom mounting plate and operatively connected to said boom assembly for permitting yawing and pitching motion of said boom assembly, said hoisting section and said counterbalance section pivotally connected to said trunnion means and further including means for releasably securing each of said boom assembly sections together, whereby said boom assembly may be folded along the sides of said derrick frame for transporting;
and derrick frame erection means on said base frame and operatively connected to said derrick frame for moving said frame from a collapsed transporting position to an erected hoisting position, said trunnion means comprising:
a lower yoke having a base and upstanding sides;
means rotatably securing said lower yoke to said boom mounting plate;
an upper yoke having depending sides;
and
a shaft hingedly connecting said upper and lower yokes through said upstanding and depending sides.

8 more elements

A collapsible boom and derrick hoist assembly removably mountable on a vehicle, comprising:

a base frame;
a derrick frame supported on said base frame for movement from a collapsed, transporting position to an erected operating position, said frame having a boom mounting plate at one end thereof;
a boom assembly having a hoisting section and a counterbalance section;
and
trunnion means rotatably secured to said boom mounting plate and operatively connected to said boom assembly for permitting yawing and pitching motion of said boom assembly, said boom assembly hoisting section being pivotally connected to said trunnion means and said counterbalance section being pivotally connected to said trunnion means and further including means for releasably securing each of said sections together, whereby said boom assembly may be folded along the sides of said derrick frame for transporting, said trunnion means comprising:
a lower yoke having a base and upstanding sides;
means rotatably securing said lower yoke to said boom mounting plate;
an upper yoke having depending sides;
and
a shaft hingedly connecting said upper and lower yokes through said upstanding and depending sides and said hoisting section being hingedly connected to one end of said upper yoke and said counterbalance section being hingedly connected to the other end of said upper yoke.

7 more elements

A collapsible boom and derrick hoist assembly removably mountable on a vehicle, comprising:

a base frame adapted for mounting on a vehicle;
a derrick frame supported on said base frame for movement from a collapsed, transporting position to an erected operating position and including a leg pivotally connected to said base frame, said derrick frame having a boom mounting plate at one end thereof;
a foldable boom assembly having a hoisting section and a counterbalance section;
hoist means on said derrick frame and said boom for hoisting articles;
trunnion means rotatably secured to said boom mounting plate and operatively connected to said boom assembly for permitting yawing and pitching motion of said boom assembly, said hoisting section and said counterbalance section pivotally connected to said trunnion means and further including means for releasably securing each of said boom assembly sections together, whereby said boom assembly may be folded along the sides of said derrick frame for transporting;
and derrick frame erection means on said base frame and operatively connected to said derrick frame for moving said frame from a collapsed transporting position to an erected hoisting position;
and said derrick frame erecting means operatively associated with said derrick frame for moving said frame from a folded transporting position to an erected hoisting position includes a winch mounted on the forward end of said base frame;
a flexible connective member extending to said derrick frame adjacent said mounting plate;
and means mounted at the rear of said base frame for movably mounting a strut between a non-operative position and an operative position, in said operative position the strut engages said flexible connective member when said derrick frame is in the transporting position for increasing the mechanical advantage of said winch when said derrick frame is being erected for use.

6 more elements

A collapsible boom and derrick hoist assembly removably mountable on a vehicle, comprising:

a base frame adapted for mounting on a vehicle;
a derrick frame supported on said base frame for movement from a collapsed, transporting position to an erected operating position and including a leg pivotally connected to said base frame, said derrick frame having a boom mounting plate at one end thereof;
a foldable boom assembly having a hoisting section and a counterbalance section;
hoist means on said derrick frame and said boom for hoisting articles;
trunnion means rotatably secured to said boom mounting plate and operatively connected to said boom assembly for permitting yawing and pitching motion of said boom assembly, said hoisting section and said counterbalance section pivotally connected to said trunnion means and further including means for releasably securing each of said boom assembly sections together, whereby said boom assembly may be folded along the sides of said derrick frame for transporting;
and derrick frame erection means on said base frame and operatively connected to said derrick frame for moving said frame from a collapsed transporting position to an erected hoisting position, said base frame including generally U-shaped side members adapted to be removably mounted to the side rails of a pickup truck withh the base of each of said side members on one of said rails and a rear cross member extending between the rear legs of said side members, said derrick including an A-frame having a truncated apex and at least one telescoping brace leg pivotally connected at one end to said A-frame adjacent said apex and wherein said derrick frame erecting means comprises:
a power driven roller extending between the front legs of said side members, said A-frame resting on said roller and the ends of the legs of said A-frame sliding on the base portions of said side members;
and
flexible connective members secured at one end to the end of the legs of said A-frame and at the other end to said roller.

6 more elements

Dependencies are inferred from the claim text.

Pickup truck derrick

Life of this patent

Pickup truck derrick

Life of this patent

Abstract

Claims25