Cab tilt hydraulic circuit

Claim 2

A remote control latch mechanism for a tilt-type cab comprising; a hydraulically operated Latch, hydraulic lift means for tilting the cab, fluid control means for simultaneously disengaging said latch and lifting said cab, and remote override means functionally interconnected with a conduit interconnecting the latch means, the lift means and the control means, said overide means allowing fluid pumped to the lift means and the latch means to circulate freely, not causing latch disengagement or lift actuation whereby the remote override means may be utilized, preventing unauthorized tilting of the cab.

Claim 3

A latch mechanism as in claim 1 wherein the remote override means is located within the cab of the truck.

Claim 4

A hydraulic control circuit for use with a truck including a main frame and an enclosed operator''s cab utilizing a hydraulic lift for a tilt cab comprising: a source of fluid under pressure, latch means for selectively latching the cab to the frame, hydraulic ram means mounted between the cab and the framework to lift one edge of the cab from the framework permitting access to mechanism thereunder, conduit means interconnecting the source of fluid under pressure with the ram and the latch, control means interconnected with the conduit means for directing fluid under pressure simultaneously to the latch means and the ram means said latch requiring less pressure to operate assuring an unlatch of the cab prior to actuation of the ram to raise the cab, override means mounted within the cab and interconnected with the conduit means operable to selectively permit or to prevent pressure buildup within the circuit whereby when the cab is locked and the override means is placed in the locked or open condition it is impossible to raise the cab.

Claim 5

A hydraulic control circuit for use with a truck including a main frame and an enclosed operator''s cab utilizing a hydraulic lift for a tilt cab comprising: a source of fluid under pressure, latch means for selectively latching the cab to the frame, hydraulic ram means mounted between the cab and the framework to lift one edge of the cab from the framework permitting access to mechanism thereunder, conduit means interconnecting the source of fluid under pressure with the ram and the latch, control means interconnected with the conduit means for directing fluid under pressure simultaneously to the latch means and the ram means said latch requiring less pressure to operate assuring an unlatch of the cab prior to actuation of the ram to raise the cab, override means mounted within the cab and interconnected with the conduit means operable to selectively permit or to prevent pressure buildup within the circuit whereby when the cab is locked and the override means is placed in the locked or open condition it is impossible to raise the cab.

Claim 6

A circuit as in claim 3 wherein the override means comprises a hydraulic valve which, when in the open or locked condition, allows free flow of the fluid from the pressure source through the conduits and back to the source without significant pressure buildup within the system.

Claim 7

A circuit as in claim 3 wherein the control means is mounted exteriorly of the cab and allows control of the hydraulic ram means from outside the cab when the override means is in its closed or unlocked condition.

Claim 8

A circuit as in claim 3 wherein the latch means, the hydraulic ram means, and the override means are all operatively interconnected with a closed circuit connected with the source of fluid under pressure such that opening of the override means disables the latch means and the ram means by allowing free flow of fluid and preventing tilt of the cab.