Integral hydraulic tilt-cab suspension and tilting apparatus
First Claim
1. In a tilt-cab tractor comprising:
- (a) a chassis;
(b) a generally four-cornered cab mounted on said chassis and pivotable with respect to said chassis about an axis near the front end of said chassis;
(c) a suspension cylinder mounted between said chassis and said cab at each of a left and right front and rear corner of said cab;
(d) accumulator means hydraulically connected to said suspension cylinders for providing cushioning in cooperation with said cylinders between said cab and said chassis;
(e) first conduit means for fluidically connecting said accumulator means and said suspension cylinders;
(f) at least one hydraulic cab tilting cylinder means pivotally mounted between said chassis and said cab to selectively tilt said cab between a normal running fully suspended position and a raised service position wherein the improvement comprises an integral hydraulic cab suspension and tilt system including;
a source of pressurized hydraulic fluid for selectively delivering pressurized hydraulic fluid to said at least one hydraulic cylinder means and said shock absorber suspension cylinders;
second hydraulic conduit mean for delivering hydraulic fluid to and returning hydraulic fluid from said at least one hydraulic cab tilting cylinder means;
third hydraulic conduit means for delivering hydraulic fluid to said first conduit means fluidically connecting said accumulator means and said shock absorber suspension cylinders;
control valve means interposed between said source of pressurized hydraulic fluid and said second and third hydraulic conduit means for selectively delivering fluid to said at least one hydraulic cab tilting cylinder means and said first conduit means; and
means connected to said first conduit means for selectively blocking flow of pressurized hydraulic fluid to said accumulator means when the tractor brakes are applied.
1 Assignment
0 Petitions
Accused Products
Abstract
A tilt-cab tractor including a chassis, a cab pivotally mounted about an axis near the front of the chassis, a suspension cylinder mounted at each corner of the cab, at least one hydraulic cab tilting cylinder, an accumulator, and a first conduit connecting the accumulator to the suspension cylinders wherein the improvement comprises; a source of pressurized hydraulic fluid for delivering hydraulic fluid to the hydraulic tilting cylinder and the shock absorber suspension cylinders, a second and third hydraulic conduit for delivering hydraulic fluid to the cab tilting cylinder and for delivering hydraulic fluid to the first conduit respectively, a control valve and means for selectively blocking flow of pressurized hydraulic fluid to the accumulator when the tractor brakes are applied.
47 Citations
12 Claims
-
1. In a tilt-cab tractor comprising:
-
(a) a chassis; (b) a generally four-cornered cab mounted on said chassis and pivotable with respect to said chassis about an axis near the front end of said chassis; (c) a suspension cylinder mounted between said chassis and said cab at each of a left and right front and rear corner of said cab; (d) accumulator means hydraulically connected to said suspension cylinders for providing cushioning in cooperation with said cylinders between said cab and said chassis; (e) first conduit means for fluidically connecting said accumulator means and said suspension cylinders; (f) at least one hydraulic cab tilting cylinder means pivotally mounted between said chassis and said cab to selectively tilt said cab between a normal running fully suspended position and a raised service position wherein the improvement comprises an integral hydraulic cab suspension and tilt system including; a source of pressurized hydraulic fluid for selectively delivering pressurized hydraulic fluid to said at least one hydraulic cylinder means and said shock absorber suspension cylinders; second hydraulic conduit mean for delivering hydraulic fluid to and returning hydraulic fluid from said at least one hydraulic cab tilting cylinder means; third hydraulic conduit means for delivering hydraulic fluid to said first conduit means fluidically connecting said accumulator means and said shock absorber suspension cylinders; control valve means interposed between said source of pressurized hydraulic fluid and said second and third hydraulic conduit means for selectively delivering fluid to said at least one hydraulic cab tilting cylinder means and said first conduit means; and means connected to said first conduit means for selectively blocking flow of pressurized hydraulic fluid to said accumulator means when the tractor brakes are applied. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12)
-
-
11. cross-over conduit means interconnecting the push end of the front-left cylinder with the pull end of the front-right cylinder and the push end of the front-right cylinder with the pull end of the front-left cylinder wherein the front suspension members will exhibit resistance to cab roll about an axis longitudinal of the tractor.
Specification