Abstract: A front loading caulking gun comprising a tube which is open for 90.degree. of its periphery having a latch pivoted at its front end which swings completely out of the way to allow cartridge insertion and removal. It is latched into holes in the sides of the tube to hold the cartridge against the dispersing pressure. The wavy spring metal latch contacts several points around the metal bead at the front end of the cartridge to prevent cocking and to hold the cartridge snugly in the device until the latch is undone.

Abstract: An electric motor housing and heat sink, and the method of assembling the same, in which a housing, constructed of electrically insulating material subject to thermal distortion, includes integral means for orienting and securing a metal heat sink therein, the latter having passages through which cooling air is drawn. The orienting means comprises deformable or meltable means such as pins integral with the housing and adapted to extend through apertures in the heat sink. In addition, a shaft bearing may either be preassembled in the heat sink before assembly to the housing, or the heat sink bored and the bearing inserted therein after the heat sink is assembled to the housing.

Abstract: A tool chuck for drills and the like including a body having gripping jaws slideably supported in tapered ways formed in the body. A split nut rotatably supported on the body threadedly engages the jaws and is operable to engage and release the jaws from a bit. The nut and body are interfitted to rotatably support and axially retain the nut on the body. A cup is fitted on the nut to hold it together and on the body and, together with the interfitted body and nut, protects the internal chuck parts from dirt and other foreign material.

Abstract: A rotary power driven portable hand tool having a simplified torque responsive clutch assembly. The clutch includes a spindle having a radially outwardly extending flange, a clutch carrier rotatable about the flange, the clutch carrier carrying a plurality of clutch balls which are forced into engagement with one face of the flange by a compression spring being held in place by adjustable spring retaining means carried by the spindle. In one embodiment the face of the flange contacted by the balls is provided with a cam surface having a plurality of spaced apart recesses, there being a washer interposed between the balls and the end of the spring adjacent the balls. In a second embodiment a sleeve member is keyed to the spindle and is disposed between the compression spring means and the clutch balls, the sleeve member being reversible and having cam surfaces of different ranges on its opposed faces, one of which faces engages the balls to hold them against the face on the flange formed on the spindle.

Abstract: A system for mounting two bearings on a single shaft to achieve self-alignment without spherical bearings. The invention system comprises a cast-in convex curved seat which cooperates with resilient hold down means, whereby the bearings are protected from damage by the force of assembly while the system is substantially self aligning.

Abstract: An improved air reversing valve, as for use with a pneumatic scaler, chisel or the like, comprising throttling means between the two sides of the valve disc whereby the tool's performance characteristics are generally improved. Additionally, the valve is made multi-element whereby its manufacture is simplified, as by powdered metal casting internal passageways in facing surfaces of adjacent parts, rather than cross drilling or the like.

Abstract: A linearly reciprocating fan for cooling a linear motor which drives the fan is disclosed as including a fan blade attached to the linear motor and means for guiding the air flow caused by the reciprocating blade across the linear motor to cool the motor.

Abstract: An improved shifter mechanism for the transmission of a power tool in which the operating lever can be located to either side of the transmission housing. The operating rod has a flat which operates one end of a pivoted shift member, the other end of which moves a clutch member to engage or disengage a rotation clutch. The shifter provides positive action, a long throw, and permits operation in either direction. The clutch itself includes an improved lubrication feature and improved mounting of the fixed clutch member to the armature shaft.

Abstract: A dust cap particularly for use with an overhead rotary hammer. The dust collector is a cup-like member with a bellows side wall, integrally formed in one piece. It has a thickened neck to fit on the tool shank below the chuck, thereby encompassing the chuck and the lower end of the anchor. Dust is efficiently caught in that the bulk of the dust passes through the anchor and chuck, and then directly into the dust collector cup, plus most of the dust outside the anchor is also caught as it falls around the anchor. The bellows side wall facilitates changing tools and removing anchor ends.

Abstract: The embodiment of the battery charging circuit disclosed herein employs a relay which can be operated both mechanically and electrically. Mechanical operation is achieved by a manually operable push button which when depressed closes a relay contact in series with the relay winding. Current then flows into the winding to actuate the relay and provide a current path for the fast charge of a battery. If the battery temperature is elevated above a level considered safe for recharging, fast charging of the battery cannot occur until the battery has cooled. If the push button is depressed while the battery temperature is so elevated, it still closes the relay contact but no current flows into the winding. However, the push button is maintained in a depressed position by engagement with the relay armature. Once the battery cools, the already closed relay contact permits current to flow into the winding to actuate the relay and initiate a fast charge.

Abstract: A manually controlled hand-held air inflator adaptor for use with an air compressor is disclosed which is suitable for molding as a single element and which includes an inlet port and passageway, and discharge and bleed ports and passageways in fluid-flow communication with said inlet port and passageway. The discharge port includes means for attachment to an inflator stem or the like, or the adaptor may be used without the inflator stem, such as for cleaning, etc.

Abstract: A sharpener having a clam-shell housing in which a motor is mounted for driving a grinding wheel disposed adjacent one end of the housing, a chuck which holds either twist drills or a diamond dresser, the chuck being indexable 180.degree. about its axis, and structure for mounting the chuck relative to the grinding wheel so that either the twist drill can be moved in a prescribed manner across the grinding periphery of the grinding wheel, or so that the diamond dresser can be moved across the grinding wheel in order to dress the wheel to a form suitable for sharpening twist drills or the like, and also means for moving the twist drills or the like or diamond dresser towards the grinding wheel.