Material or article handling – Vertically swinging load support – Grab
Patent
1980-05-30
1982-08-03
Schacher, Richard A.
Material or article handling
Vertically swinging load support
Grab
414739, B66C 142
Patent
active
043425348
ABSTRACT:
Apparatus for retracting and securing the grapple head (22) of a grapple skidder (10) for travel over rough terrain in an unloaded condition. A pair of cables (94, 96) of equal length are attached to the grapple head at points laterally spaced from the vertical pivot axis of the grapple head. The cables extend through a guide member (100) on the grapple arch (20) and are wound together onto a winch (24) mounted on the skidder frame (14). The guide member has a relatively large opening (106) flared outwardly and downwardly facing the grapple head, and a relatively smaller opening (108) flared outwardly and downwardly facing the winch. In normal operation of the grapple, the cables are left slack. When the grapple head is to be secured for travel, the cables are winched in. Since the cables are wound together, they retract together regardless of the relative tension in each cable, such that the grapple head automatically becomes centered square to the back of the skidder when the cables are winched in. In the retracted position the flared guide tends to pull the spaced ends of the cables attached to the grapple head inward toward the longitudinal centerline of the skidder to minimize lateral movement of the grapple head during travel.
REFERENCES:
patent: 3477596 (1969-11-01), Michaelson
patent: 3781056 (1973-12-01), Ransford
patent: 3841507 (1974-10-01), Barwise
patent: 3972431 (1976-08-01), Fischer
patent: 4113124 (1978-09-01), Muntjanoff
Bestard Thomas L.
Roesler Richard R.
Eaton Corporation
Grace C. H.
Sajovec F. M.
Schacher Richard A,.
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