Material or article handling – Vertically swinging load support – Shovel or fork type
Patent
1989-11-22
1991-05-28
Spar, Robert J.
Material or article handling
Vertically swinging load support
Shovel or fork type
92 85B, E02F 342
Patent
active
050189344
ABSTRACT:
A backhoe pivotally supported from a prime mover is disclosed wherein the hydraulic boom cylinder operably interconnecting the frame of the prime mover and the boom member for operably moving the boom assembly generally vertically relative to the prime mover is provided with a decelerator to slow the flow of hydraulic fluid from the cylinder as the cylinder becomes completely collapsed, corresponding to a placement of a boom assembly into a transport position. The decelerator is formed as a piston extension detachably connected to the piston of the hydraulic cylinder and having an orifice therethrough to permit passage of hydraulic fluid at a slower rate once the piston extension seal has passed the corresponding port. An annular gap between the piston extension and the wall of the boom cylinder permits the flow of hydraulic fluid through the decelerator to reach the exhaust port irrespective of the radial location of the orifice through the piston extension relative to the exhaust port.
REFERENCES:
patent: 3626812 (1970-07-01), Trick
patent: 3630120, Carlson et al.
patent: 3782710 (1974-01-01), Selke et al.
patent: 3797366 (1974-03-01), Hanes et al.
patent: 4151784 (1979-05-01), Fussangel
patent: 4321987 (1982-03-01), Dressell, Jr. et al.
Morrison William S.
Steinkamp John O.
Ford New Holland Inc.
Marquette Darrell F.
Miller Larry W.
Seemar Frank A.
Spar Robert J.
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