| 摘要 |
<p>A movable subframe for tractor-trailers, commonly referred to as a slider (10), includes an improved retractable pin mechanism (14) for locking the movable subframe body. A manually operated handle (42) is used to pneumatically actuate the pin mechanism, or in the event that the mechanism is unable to be pneumatically actuated, to manually actuate the pin mechanism. Conversion between the pneumatic and manual actuation modes is accomplished without modification to the retractable pin mechanism (14). More specifically, a handle asembly, which in the pneumatic mode operates generally independent of the other parts of the pin mechanism (14), is manually moved from a starting postion in which the pins are in an extended locked position, to a first position to engage a button valve (66) thereby opening the valve to supply air to an air chamber, which in turn causes pneumatic actuation and retraction of the pin mechanism (14). Alternatively, the handle assembly can be moved directly from the starting position to a second position, bypassing the first position and the pneumatic mode, whereby the handle assembly operates integrally with the other parts of the pin mechanism (14), which in turn causes manual actuation and retraction of the pin mechanism (14),</p> |
