IL41681A

IL41681A - Tractor-mounted graderleveler

Info

Publication number: IL41681A
Application number: IL4168173A
Authority: IL
Inventors: G Manor; A Yavnai
Original assignee: Tech Res & Dev Found Ltd
Priority date: 1973-03-05
Filing date: 1973-03-05
Publication date: 1976-05-31

Claims

1. C L A I S - 1 » A mechanism for setting the angle of the blade of a grader-leveler as claimed in Claim 1 of Patent Application No. 37217» by hydraulic transmission means, which comprises a hydraulic piston motor of the linear or rotary type and a direction control valve, both of known design, the movable force- transmitting portion of the suitably connected to the turntable or the blade in such a manner that when fluid pressure is applied to one side of the piston or pistons, the turntable-and- blade combination is rotated about its axis and brought into the desired position.

2. A mechanism for hydraulic setting of the grader blade as claimed in Claim 1, wherein fluid release means are provided at each side of the piston housing and are adjusted so as to open and release fluid from the respective side of the piston or pistons, whenever the fluid pressure exceeds a limit defined by an excessive load on the blade, this fluid release permitting the piston or pistons to move freely and to allow the turntable with the. attached blade to turn about its axis and thereby to prevent damage to the equipment.

3. * A mechanism for hydraulic setting the grader blade as claimed in Claim 2, wherein the release means on valve which permits, at excess pressure, fluid to be drained from this side and to flow into a collecting vessel, and of an anti-cavitation valve placed in parallel to the relief valve permitting fluid from the collecting vessel to enter the other side of the piston housing*

4. · A mechanism for hydraulic setting the angle of a grader blade as claimed in Claim 2 wherein the release means comprise one single relief valve connected to both sides of the piston housing via one check-valve each, two anti-cavitation valves being provided between the two sides of the piston housing and the collecting vessel.

5. A mechanism for hydraulic setting of a grader blade as claimed in Claims 1 and 2 wherein the hydraulic motor is controlled by a solenoid-operated direction control valve of known design, to be actuated in the required direction by a manual switch, and wherein the release means consist of one pressure switch each connected hydraulically to one side of the piston housing, and electrically to one of the solenoids of the direction control valve, thereby moving the latter into a position allowing the outflow of fluid from the housing on the excess-pressure side and to admit fluid to the opposite side. A mechanism for hydraulic setting of the angle of a grader blade and for releasing the blade whenever excess load occurs, substantially as hereinbefore described and illustrated in the accompanying drawings . E.A OLUCKSMAN P J&ent Attorney For the applicants TQchnion Research and Development Foundation Ltd.