RONALD NELSON, LPHD
Psychologist at Edgewood Rd, Cedar Rapids, IA

License number

Iowa 00386

Professional information

Ronald G Nelson, Cedar Rapids IA

Specialties:

Psychologist

Address:

800 1St St Nw, Cedar Rapids, IA 52405
222 Edgewood Rd Nw, Cedar Rapids, IA 52405

Ronald Nelson, Cedar Rapids IA

Specialties:

Psychology

Address:

222 Edgewood Rd NW STE 202, Cedar Rapids 52405
(319) 393-5004 (Phone), (319) 393-5004 (Fax)

Languages:

English

Override Control For Axle Locking Apparatus Of Mobile Crane

US Patent:

4344497, Aug 17, 1982

Filed:

Oct 19, 1979

Appl. No.:

6/086661

Inventors:

Ram N. Rathi - Cedar Rapids IA
Ronald E. Nelson - Cedar Rapids IA

Assignee:

Harnischfeger Corporation - West Milwaukee WI

International Classification:

B60G 1700, B66C 1312, B66C 2304

US Classification:

180 41

Abstract:

A pair of hydraulic locking cylinders for a vertically oscillatable wheel axle on the carrier frame of a mobile crane are interconnected and controlled by a hydraulic double-locking valve which is responsive to the centered or off-centered rotary position of the boom-carrying rotatable upper section of the crane. The double-locking valve comprises a pair of normally closed ball-type check valves which are operated by a valve stem comprising independently movable upper and lower sections. The upper valve stem section is positioned by a cam on the crane upper section and the lower valve stem section is positioned by a pneumatic actuator which is controlled by a solenoid valve selectively actuatable by an electric override switch in the crane operator's cab. The upper valve stem is moved to down (valve open-axle unlocked) position by the cam when the crane upper is centered on the carrier frame. The upper valve stem moves to up (valve closed-axle locked) position when the crane upper is rotated off-center.