Load holding device for mobile power crane excavators and the li

Details Load holding device for mobile power crane excavators and the li Load holding device for mobile power crane excavators and the li

1974-03-04

1976-03-16

Spar, Robert J.

91447, F02F 384

Patent

active

039440990

ABSTRACT:
A control system for crane-excavators and the like wherein a metering valve is connected by fluid lines to the control cylinder for the load carrying member, such as a boom or dipper arm. A check valve and a spring biased relief valve are disposed in the fluid line on the down side of the external force created by the weight of the load carrying member on the cylinder. To prevent pressure peaking in both the upside and downside lines, as well as improper check and relief valve operation when the metering valve is moved to neutral, the metering valve is constructed to connect the downside line to the drain tank when the valve is in neutral position.

REFERENCES:
patent: 3381587 (1968-05-01), Parquet
patent: 3596566 (1971-08-01), Krehbiel
patent: 3640069 (1972-02-01), Sugahara et al.
patent: 3691904 (1972-09-01), Pesci
patent: 3843003 (1974-10-01), Frank

Affiliated with

Also associated with

Rating

Load holding device for mobile power crane excavators and the li does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Load holding device for mobile power crane excavators and the li, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Load holding device for mobile power crane excavators and the li will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-288012