Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent
1980-12-15
1983-05-10
Marbert, James B.
Handling: hand and hoist-line implements
Hook, hoistline, or grab type
Locking device
294 86R, 294 67R, B66C 100
Patent
active
043826245
ABSTRACT:
A grapple assembly includes a grapple suspended from an outer end of the grapple boom by means including a double clevis permitting the grapple to swing about a pair of crosswise disposed pivot axes. A double clevis is pivotally connected to the lower end of an upright output shaft which is rotatably mounted in the grapple boom. A fluid supply passage is provided in the shaft and has a first pair of outlets disposed diametrically from each other and in a vertical plane containing one of the pivot axes and a first pair of snubber hoses are connected between these outlets and the grapple frame. Similarly, a second pair of outlets of the passage are located diametrically from each other and in a vertical plane containing the other pivot axis and a second pair of snubber hoses are connected between these outlets and the frame. A hydraulic circuit is provided for selectively pressurizing the snubber hoses to thereby stiffen them and inhibit swinging movement of the frame about the pair of axes. In a second embodiment of the invention, the fluid supply passage in the output shaft has only a single outlet and it is located on the axis of the shaft and connected between this outlet and a blind bore on the frame is a single snubber hose which intersects the pivot axes of the frame.
REFERENCES:
patent: 3301587 (1967-01-01), Heikkinen
patent: 3933389 (1976-01-01), Korber
patent: 4181343 (1980-01-01), Lindqvist
patent: 4239273 (1980-12-01), Dodemont et al.
Advertising Brochure referring to ESCO Model 26 Grapple, published by ESCO Corporation and received by Deere & Company Patent Department on June 9, 1975, ESCO Catalog Supplement 1 (2 unnumbered, undated pages) bearing ahand-written date of May 1978.
Deere & Company
Marbert James B.
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