1975-02-24
1977-04-05
Spar, Robert J.
92 33, 92 85B, E02F 332
Patent
active
040157288
ABSTRACT:
An improved hydraulic actuator for use as a swing motor in a material handling apparatus of the type having a vehicle mounted boom. Two embodiments are disclosed and each includes a vertically disposed, double-acting cylinder having an internal, vertically reciprocal piston. The cylinder may be disposed between yoke arms mounting a boom and provision is made for securing the cylinder to the vehicle frame. A coupling device is secured to one of the yoke arms and has a first splined surface while means are carried by the piston and movable therewith and include a second splined surface slidably engaging the first splined surface. The piston also carries a third splined surface which is in engagement with a fourth splined surface carried by either the cylinder or a part of the vehicle frame and at least one of the splined surfaces has a helical pitch so that reciprocation of the piston will cause rotation of the coupling device to thereby effect rotation of the yoke to swing a boom attached thereto about a generally vertical axis.
REFERENCES:
patent: 2765778 (1956-10-01), Gerry et al.
patent: 3213760 (1965-10-01), Carr
patent: 3393610 (1968-07-01), Aarvold
patent: 3513754 (1970-05-01), John
patent: 3758941 (1973-09-01), Jackson et al.
patent: 3805672 (1974-04-01), Pekrul
patent: 3844197 (1974-10-01), Kramer et al.
Barker Noble G.
Corwin John E.
Myers Jimmy D.
Yates Jan B.
Caterpillar Tractor Co.
Spar Robert J.
Weaver Ross
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