摘要:
Quick drop valve and circuit employing same for hydraulically positioning and supporting a dozer blade. The circuit includes a double acting positioning cylinder supporting the blade, a raiselower valve connected to hoses which lead to the cylinder, and the quick drop valve which valve is interposed between the hoses and cylinder and which valve increases dropping speed of the blade by passing fluid between opposite ends of the cylinder in a direct path without the fluid passing through the control valve and cylinder hoses. The valve has a conventional check valve therein, and the only other movable valve part therein consists of a novel single valve sleeve.
摘要:
TRACTOR HAVING DUMP VALVE AND FORWARD-REVERSE DRIVE CONTROL EMPLOYING SAME, EFFECTIVE TO AUTOMATICALLY BRAKE THE TRACTOR WHEN REVERSING THE TRACTOR''S DIRECTION OF MOTION. THE TRACTOR HAS BRAKES. A REVERSIBLE TRANSMISSION CONTROLLED BY THE DUMP VALVE, A RANGE SELECTOR VALVE HAVING A CONTROL PORTION, AND A RUN DETECTOR PUMP TO SENSE DIRECTION OF ROLLING MOVEMENT OF THE TRACTOR AND HAVING A DIRECTIONALIZED PUMP OUTPUT. THE DUMP VALVE GENERALLY RECEIVES AGAINST PRESSURE MOVABLE END AREAS THEREOF AN OUTPUT FROM THE RANGE SELECTOR VALVE AND DIRECTS CONTROL PRESSURE TO OPERATE THE BRAKES AND TRANSMISSION IN ALTERNATION TO ONE ANOTHER AND, SPECIFICALLY: RECEIVES AGAINST THE PRESSURE MOVABLE END AREAS THE DIRECTIONALIZED PUMP OUTPUT SO AS TO BE HYDRAULICALLY BALANCED IN A CENTERED POSITION OPERATING THE TRACTOR WITH TRANSMISSION ENGAGED AND BRAKES DISENGAGED, RECEIVES AGAINST THE PRESSURE MOVABLE END AREAS AN UNBALANCING FORCE FROM THE RANGE SELECTOR VALVE CONTROL PORTION CAUSING THE DUMP VALVE TO SHIFT OFF CENTER AND DUMP, NEUTRALIZING THE TRANSMISSION AND SETTING THE BRAKES, AND HAVING VALVE SPRINGS EFFECTIVE TO MECHANICALLY REBALANCE THE DUMP VALVE ATTENDANT WITH SLOW DOWN OF THE RUN DETECTOR PUMP, CAUSING THE DUMP VALVE TO RECENTER, RELEASING THE BRAKES AND ENGAGING THE TRANSMISSION IN AN OPPOSITE DRIVE SETTING.
摘要:
Detachable connection of a piston onto a reduced diameter section of a rod, at a location thereon between spaced apart shoulders provided by the reduced diameter section. The piston is wedged into final tightness by clamped double angle wedging segments, the clamping being accomplished by a plurality of diametric pairs of threaded, piston hold-down devices.
摘要:
Hydraulic means operating in conjunction with a hydraulic power unit for automatically stopping in an intermediate position a device whose position is controlled by the hydraulic power unit. A digging bucket is automatically stopped at a digging position intermediate to dumping and breakout positions with respect to a boom arm. A pilot valve connected to an intermediate region of a cylinder of the hydraulic power unit regulates the control valve for the power unit.
摘要:
Tractor having dump valve and forward-reverse drive control employing same, effective to automatically brake the tractor when reversing the tractor''s direction of motion. The tractor has brakes, reversible transmission controlled by the dump valve, a range selector valve having a control portion, and a run detector pump to sense direction of rolling movement of the tractor and having a directionalized pump output. The dump valve generally receives, against pressure movable end areas thereof, an output from the range selector valve and directs control pressure to operate the brakes and transmission in alternation to one another and, specifically: receives against the pressure movable end areas the directionalized pump output so as to by hydraulically balanced in a centered position operating the tractor with transmission engaged and brakes disengaged; receives against the pressure movable end areas an unbalancing force from the range selector valve control portion causing the dump valve to shift off center and dump, neutralizing the transmission and setting the brakes; and having valve springs effective to mechanically rebalance the dump valve attendant with slowdown and drop of unbalancing pressure from the run detector pump, causing the dump valve to recenter, releasing the brakes and engaging the transmission in an opposite drive setting.
摘要:
Tractor having dump valve and forward-reverse drive control employing same, effective to automatically brake the tractor when reversing the tractor''s direction of motion. The tractor has brakes, a reversible transmission controlled by the dump valve, a range selector valve having a control portion, and a run detector pump to sense direction of rolling movement of the tractor and having a directionalized pump output. The dump valve generally receives, against pressure movable end areas thereof, an output from the range selector valve and directs control pressure to operate the brakes and transmission in alternation to one another and, specifically: receives against the pressure movable end areas the directionalized pump output so as to be hydraulically balanced in a centered position operating the tractor with transmission engaged and brakes disengaged; receives against the pressure movable end areas an unbalancing force from the range selector valve control portion causing the dump valve to shift off center and dump, neutralizing the transmission and setting the brakes; and having valve springs effective to mechanically rebalance the dump valve attendant with slowdown and drop of unbalancing pressure from the run detector pump, causing the dump valve to recenter, releasing the brakes and engaging the transmission in an opposite drive setting.