Abstract: A blade having a chisel point at one end and a cutting point intermediate its ends is mounted in the blade holder of a sabre saw. As the sabre saw is moved along the wallboard to be cut, the chisel point on each stroke moves through the gypsum core, its rearwardly inclined end forcing the gypsum back into the kerf. The chisel point need only fracture the paper on the rough side of the wallboard, although it may pass completely therethrough. The cutting point severs the paper on the finished side of the wallboard.

Abstract: An L-shaped clip of sheet metal is provided with a pair of resilient fingers having their connected ends offset from the plane of the clip leg that they are integral with, the fingers then curving upwardly at a decreasing radius with two points or teeth at the upper end of each finger, the four points (two on each finger) all being at different elevations. When cutting out a section of a panel to form an opening, such as in a counter top to accommodate a kitchen sink, an appropriate number (usually four) of clips are inserted into the saw kerf so that the resilient fingers prevent the cutout panel portion from falling, the various points or teeth frictionally pressing against the otherwise detached panel portion to releasably retain the panel portion in place.

Abstract: A hinged lid closes the upper end of the vertical exhaust pipe of an internal combustion engine to keep rain and snow from entering the engine when it is shut down. A latch prevents vandals from manually opening the lid, but the latch is automatically released by the force of the exhaust gases striking a pivotal vane carried on the underside of the lid when the engine is started. The escaping exhaust gases also act against the lid to open it, and the lid remains open as long as the engine continues to operate. However, each time the engine is shut down the lid is again automatically latched closed and cannot be manually opened. This prevents the pouring of water, sand or other debris into the exhaust pipe by vandals, and has the added advantage of keeping the lid from being blown open by the wind. Provision is made for utilizing a conventional padlock so as to externally lock the lid closed or, if desired, to lock the lid open.