Excavating – Peat excavators
Patent
1982-06-01
1983-09-13
Eickholt, E. H.
Excavating
Peat excavators
111 2, A01G 2304
Patent
active
044034270
ABSTRACT:
Tree planter for mounting on a truck chassis, the tree planter including a four-spade digger reciprocally mounted on an end of an extendable boom, the boom movable at the other end on a self-aligning bushing, the bushing secured in a hoist frame. The boom includes three attached hydraulic cylinders for boom up/down hoist motion, boom roll/twist motion and boom side/side motion, and a fourth internal boom extension hydraulic cylinder for telescoping the boom between a retracted and extended position. The four hydraulic cylinders position the digger with all degrees of radial and axial freedom. A fifth hydraulic cylinder controls tilt of the digger with respect to the boom. The four-spade digger includes six hydraulic cylinders, one hydraulic cylinder for actuating each of four spades for up-and-down action in each spade tower, and two hydraulic cylinders to open and close rear gates around a tree when either digging up or planting a tree from either the ground or about a truncated continuous cone-shaped container of a tree transportating trailer. The tree planter is hydraulically operated in a parallelogram action providing articulation for facilitating work operations in close quarters at nurseries, tree farms and points of delivery. The tree planter includes an embodiment for a vibrating spade assembly using a pulsating electric valve or the like for opening of the hydraulic valve in addition to varying the frequency of vibration of each spade. A second embodiment of a large-sized spade for utilization in close, confining areas provides that the spade is raised in a substantially parallel plane with minimal arcuate movement.
REFERENCES:
patent: 3713234 (1973-01-01), Grover et al.
patent: 3936960 (1976-02-01), Clegg
patent: 4226033 (1980-10-01), Dehaan
patent: 4271879 (1981-06-01), Shivers et al.
patent: 4286398 (1981-09-01), Lemond et al.
patent: 4351253 (1982-09-01), Dahlquist
Eickholt E. H.
Jaeger Hugh D.
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