Land vehicles – Wheeled – Articulated vehicle
Patent
1979-02-16
1980-12-23
Love, John J.
Land vehicles
Wheeled
Articulated vehicle
280404, B62D 5300
Patent
active
042406471
ABSTRACT:
In an elongate truck trailer tongue assembly having hollow, inner and outer telescoping tongue members movable between shortened and extended tongue positions, a remotely controlled, pneumatically actuated friction shoe is mounted within the tongue to selectively lock the tongue members in either the shortened or extended position. The tongue members are tubular and have square-shaped cross sections, and the friction shoe is shaped and mounted so as to be supported by the inner tubular member and, when actuated, to bear against interior wall surfaces of the outer tubular member, frictionally locking the members against relative movement and rigidifying the tongue assembly so that it acts as a unitary structure between the trailer and towing tractor. Cooperating with the friction shoe is a pneumatically actuated, spring-biased safety pin assembly which is mounted on the inner tongue member and engages mating holes on the outer tongue member at the shortened and extended tongue positions, to provide a backup lock for the tongue assembly should there be a loss of air pressure to the pneumatically actuated friction shoe. The safety pin is normally held in a locked position by the spring bias and is withdrawn therefrom whenever the normally pressurized actuator of the friction shoe is vented to allow telescoping of the tongue members so as to adjust the tongue length. In an alternative embodiment, the friction shoe is actuated by a pair of hydraulic cylinders powered by a hydraulic fluid that is pressurized via an air-to-hydraulic pressure converter mounted inside the hollow tongue members.
REFERENCES:
patent: 3665812 (1972-05-01), Hashimoto
patent: 3881748 (1975-05-01), Donaldson
patent: 3972540 (1976-08-01), Donaldson
Love John J.
Schrecengost Randall A.
LandOfFree
Pressure-operated friction locking apparatus for slidably adjust does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pressure-operated friction locking apparatus for slidably adjust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pressure-operated friction locking apparatus for slidably adjust will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2239095