Abstract: A blocking device for attaching to an entry aperture structure of a spring brake cylinder of a vehicle includes a blocking fastener having a head and a shaft extending from the head. The head has a plurality of cylindrical recesses that extend generally parallel to the shaft. At least a portion of the shaft is threaded. A fastener receiver has an insertion portion and a base extending generally transversely to the insertion portion. The insertion portion has an interior surface that is threaded and is configured to receive the shaft of the blocking fastener. The base has a first tier that extends generally radially from the insertion portion and has a diameter that corresponds to the diameter of the entry aperture structure such that the base engages the entry aperture structure radially. A fastener receiving component is disposed on the shaft.

Abstract: A parking brake lock-in key switch system for a truck or bus brake system. The system has two parking brake lock-in valves. One parking brake lock-in valve is installed in the air line piping between the primary air tank and the push pull double check valve and the second parking brake lock-in valve is in the air line piping between the secondary air tank and the push pull double check valve. The parking brake lock-in valves are air operated valves which when closed will look in actuated parking brakes. The parking brake lock-in valves are operated by a solenoid operated pilot valve which provides air from an air supply to close the lock-in valves when the ignition key is moved to the ‘off’ position. An actuated parking brake will be locked in because new air from the respective tanks will be prevented from flowing to the push pull double check valve and hence the brake chambers. The parking brake lock-in valve does not vent off downstream piping when it closes.

Abstract: A parking brake lock-in key switch system for a truck or bus brake system is disclosed. The system has two parking brake lock-in valves. One parking brake lock-in valve is installed in the air line piping between the primary air tank and the push pull double check valve and the second parking brake lock-in valve is in the air line piping between the secondary air tank and the push pull double check valve. The parking brake lock-in valves are air operated valves which when closed will lock in actuated parking brakes. The parking brake lock-in valves are operated by a solenoid operated pilot valve which provides air from an air supply to close the lock-in valves when the ignition key is moved to the `off` position. An actuated parking brake will be locked in because new air from the respective tanks will be prevented from flowing to the push pull double check valve and hence the brake chambers. The parking brake lock-in valve does not vent off downstream piping when it closes.

Abstract: A clamp securely clamps together a plurality of tubular structures such as tubing, hoses and electrical harnesses. The tubular structures need not be of the same diameter and can be up to at least 2 inches in diameter. The clamp includes a planar base portion having two upright end flanges which each include a clasp element projecting outwardly therefrom. A rubber strap is secured over the base portion, and is engaged to the base portion over the top of the flanges at each end thereof by means of openings therein engaging a respective clasp element.