B - Operations – Transporting – 62 – D
Patent
B - Operations, Transporting
62
D
B62D 21/14 (2006.01) B62D 61/00 (2006.01)
Patent
CA 2122315
A pneumatic locking system mounted on a sliding undercarriage of a semitrailer, the semitrailer pulled by a tractor. The locking system is used for securing and releasing a sliding undercarriage from a pair of parallel rails mounted on an underside of the semitrailer, the parallel rails having spaced apart locking pin holes along their length. The locking system includes one pair or two pair of air cylinders with pistons. The air cylinders are mounted on the sliding undercarriage and disposed next to the parallel rails. Locking pins are attached to each piston with a portion of the locking pins inserted into selected locking pins holes in the parallel rails when in a locked position. A 4-way air valve is connected to the air cylinders and a pressurized air source on the semitrailer. The air valve directs pressurized air to the air cylinders for retracting and extending the pistons in the cylinder. An air pressure switch is connected to a pressurized air line to the semitrailer air brakes. The air pressure switch is connect to and controls the operation of the air valve when retracting and unlocking the locking pins from the locking pin holes. The air pressure switch allows pin retraction only when air pressure is released to the semitrailer air brakes and spring brakes on the semitrailer are set. A pin release lever or pinrelease button is attached to the air valve and is used for releasing the locking pins when the spring brakes have been set.
Borden Ladner Gervais Llp
Wessels Larry L.
LandOfFree
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