Pin retractor for semi-trailer tandems

Details Pin retractor for semi-trailer tandems Pin retractor for semi-trailer tandems

1988-09-26

1990-07-31

Bertsch, Richard A.

Land vehicles

Wheeled

Running gear

280 801, B60G 504, B62D 5306

Patent

active

049445227

ABSTRACT:
A pneumatically powered pin retractor is disclosed. Semi-trailers comprise tandems which can be slid forward and backward when a set of pins are retracted. In conventional semi-trailers, manually pulling a pin release lever located on the side of the tandem rotates the pin control shaft, thereby retracting the pins. The disclosed pin retractor comprises a lever arm attached to the pin control shaft, a pneumatic ram to push the lever arm thereby rotating the pin control shaft and retracting the pins, and a means for activating the pneumatic ram. The source of air pressure to power the pneumatic ram is normally the service air tank on the tandem.

REFERENCES:
patent: 3618969 (1971-11-01), Glassmeyer
patent: 3778079 (1973-12-01), Vornberger et al.
patent: 4273347 (1981-06-01), Hulse
patent: 4286797 (1981-09-01), Mekosh, Jr. et al.
patent: 4353565 (1982-11-01), Smith et al.
patent: 4641846 (1987-02-01), Ehrhart
patent: 4838578 (1989-06-01), Baxter
"The Revenue Producer" brochure, 2 pages, date unknown.
"The Lite-Slide" brochure, 4 pages, date unknown.
"Qwik-Release" brochure, 2 pages, date unknown.
"Lite-Slide" brochure, 2 pages, date unknown.
"Maintenance Tip: Sliders are Slick Savers," p. 8, NATSO Truckers News, Jul., 1988.

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