Locking mechanism for movable subframe of semi-trailers
US6279933A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 10, 2001 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Apr 10, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D53/068
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A locking mechanism for a movable subframe of a semi-trailer includes at least a pair of transversely spaced pins. Each pin is extendable into and retractable from an opening formed in its respective longitudinally extending main member of the subframe and a selected aligned one of a plurality of openings formed in its respective longitudinally extending rail of the trailer main frame. An elastomeric bladder is disposed between the pins and is operatively connected to one or more cables and/or linkage members which in turn are operatively connected to the pins. When the bladder is voided of air and is in its collapsed state, sufficient slack exists in the bladder, cables and/or linkage members to enable the bias force of a coil spring disposed about each of the pins to independently cause the pins to extend through their respective aligned openings to lock the subframe in a selected longitudinal position with respect to the trailer main frame. When air is introduced into the bladder, it distends or elongates and in turn shortens the length of the portions of the bladder, cables and/or linkage members which are in transverse alignment with the pins, to impart a linear retraction for…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.