Abstract: A device to actuate a contamination cover on a machine bracket is disclosed. The device may include a first transition cylinder mounted on the machine bracket and connected to the contamination cover, a transition circuit connected to the first transition cylinder for transmission of hydraulic pressure to the first transition cylinder; and a transition sensor coupled to the transition circuit to control the transmission of hydraulic pressure to the first transition cylinder. The activation of the transition sensor may permit the transmission of hydraulic pressure to drive the first transition cylinder for transition of the contamination cover from a close to an open position.
September 3, 2012
August 14, 2014
Caterpillar Work Tools, B.V.
Cornelius Antonius Maria Van Hooft, Dirk Jacobus Luyendijk, Holger Jongebloed
Abstract: A bi-stable valve arrangement includes a body having first and second opposing ends and constructed and arranged to define a passage between the body and another element so that the passage extends from the first end to the second end. A seal member associated with the body. A first spring structure biases the seal member in a first direction and a second spring structure biases the seal member in a direction opposite the first direction. The first and second spring structures are constructed and arranged so that the seal member may seal the passage.
Abstract: An in-line hydraulic dashpot is disclosed that effectively decelerates the iston of a power cylinder by controllably choking off the oil which is providing pressure to the piston. The in-line hydraulic dashpot of the invention includes a valve spool member movable between an open and closed position along a fluid flow path that supplies oil to the power cylinder. An actuator rod is cooperative with the valve spool member and the piston shaft of the power cylinder to move the valve spool member between its open and closed positions. The in-line hydraulic dashpot eliminates the clashing of mechanical parts and therewith eliminates the noise that would otherwise be generated thereby. The in-line hydraulic dashpot of the present invention makes possible the adaptation of a fixed stroke power cylinder to applications that call for a variable stroke length.
March 25, 1991
Date of Patent:
October 6, 1992
The United States of America as represented by the Secretary of the Navy
Abstract: A compactor includes a longitudinally extending ground supported frame having an open end and a closed end. A cylinder and piston assembly is positioned within the frame and extends longitudinally therealong and a ram is secured to the piston for transferring waste through the open end. The cylinder has fluid ports at opposite ends thereof. An hydraulic fluid supply assembly introduces pressurized fluid to said ports for causing selective movement of the piston relative to the cylinder. An hydraulic spool valve is carried by the piston for permitting fluid to flow between the ports and for thereby preventing displacement of the piston when the dwell assembly engages one of the ends.
Abstract: A pneumatically operated fastener driving device having an adjustable staple leg length clinching mechanism and an improved actuating mechanism including a drive piston controlling valve member, a trigger member, an actuating member mounted on the trigger member and a control member.
Abstract: An energy conserving air motor with rotary actuation includes a pair of cooperating different diameter pistons coaxially arranged and connected rigidly to one another by a central connecting member provided with spur gear section adaptable of receiving a meshing pinion assembled inside an elongated housing provided with a diffential diameter bore passing therethrough and adaptable of receiving inside a larger diameter section which is blind a larger piston while smaller diameter section which is provided with fluid supply and exhaust port means receives smaller diameter piston while said pinion entering said housing perpendicularly substantially central to the housing ends so as to rotate therein when pistons move linearly inside bore between a first normally atmospheric and a second energized positions in response to the working fluid pressure supplied via fluid supply and exhaust port means by way of a 3-way solenoid or pilot operated directional valve so as to allow energization of the small diameter pisto
Abstract: A fast acting hydraulically actuated ram (10) especially suitable for use in the punch head of a press uses a first ram area (28) to advance the ram until the load thereon increases, which occurs when punching is about to take place. Then a pressure actuated valve (22), which is responsive to the increase in hydraulic pressure acting upon the first ram area, places pressure on a large area (36) of the ram for a time sufficient to enable penetration of the work. An electrohydraulically controlled valve (20, 98) responsive to the ram position, switches hydraulic pressure which is applied to the first ram area so as to operate the ram under electrical control to provide the desired cycle time and frequency.
Abstract: A hydraulic sequencing valve is disclosed. A hollow spool is slidably carried in a valve body for motion between a first position in which fluid is caused to flow out a valve first port and a second position in which fluid is caused to flow into the first port. An annular partition is provided within the spool hollow, which divides the spool hollow into two chambers. When a pressure rise is experienced within the spool, a pre-set valve element trips, reducing pressure within one spool chamber. This pressure change shifts the spool to a second position. A check valve is provided in a separate valve body conduit. This check valve operates to assure that the valve spool remains in its second position until the valve and associated hydraulic system have completed the full cycle of operation.
Abstract: A pneumatic control system for a press which includes a pair of start switches. The system is constructed so that the press can only be started if both of the start switches are actuated within a predetermined time interval. If one of the start switches is released during a down stroke of the press, the press is stopped. A cam operated switch permits continued operation of the press after the press has reached its bottom position even though start switches are released after the press has passed full down position. A brake cam operated switch prevents operation of the press if the press fails to stop at its full up position.