Automatic locking pin retraction mechanism

Details Automatic locking pin retraction mechanism Automatic locking pin retraction mechanism

1981-04-22

1983-06-14

Spar, Robert J.

Material or article handling

Vertically swinging load support

Shovel or fork type

298 17B, E02F 316

Patent

active

043880380

ABSTRACT:
An automatic locking pin retraction mechanism for a skid-steer loader is disclosed wherein the locking pins for locking the loader boom arms in an elevated position will be automatically retracted under conditions where the locking pins are extended into the path of movement of the boom arms and the boom arms are below the locking pins and moving upwardly toward engagement with the locking pins, so as to avoid engagement between the boom arms and the locking pins. The retraction mechanism includes a pivotally mounted first member engageable with one of the boom arms and a link interconnecting the first member and a mechanism for simultaneously actuating the locking pins. Pivotal movement of the first member caused by engagement with the boom arm effects a retraction of the locking pins before the boom arms can engage therewith. An over-center spring arrangement is provided to bias the first member in the engagement position or in a neutral position, depending on the position of the first member.

REFERENCES:
patent: 1709459 (1929-04-01), Callahan
patent: 2056226 (1936-10-01), Mussey et al.
patent: 3215292 (1965-11-01), Halls
patent: 3730362 (1973-05-01), Hurlburt et al.
patent: 3995761 (1976-12-01), Hurlburt
patent: 4227852 (1980-10-01), Schmitz et al.

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