Abstract: A cutter head assembly having two types of independent connecting means to insure that the cutting blade remains mounted to the cutting block even in the unlikely event that one type of connection should fail.The first type of connecting means are connecting screws which pass through slots in the blade to threadedly engage within tapped holes in the block. The second type of connecting means are security screws affixed to the blades via tapped holes therein to be disposed within apertures of the block so that after the blades are mounted in adjusted position on the set screws threaded into tapped holes which intersect the apertures will engage the security screws affixed to the blade.

Abstract: A portable garden tool with an upper movable tool element which is provided with a blade having a plurality of cutting teeth and a lower tool element which is in two pieces so that one can be removed from the tool. The removable portion is either a shear blade attachment to perform with the upper tool element as a shear, or a cultivator attachment to perform with the upper tool element as a cultivator. The tool can also be used as a cultivator without damage to the performance of the tool as a shear, since the blades of the upper movable tool element are not sharpened.

Abstract: The subject safety switch insures that the chuck key has been removed from the chuck prior to operation of the drill press. A slide "on-off" switch is engaged by a guard that prevents the sliding movement necessary to turn the switch on. The guard of the safety switch is not part of the electrical circuit, but rather is a mechanical addition which prevents operation of the electrical circuit. The socket is formed in the housing adjacent the guard. The chuck key is inserted into the socket to engage the guard and remove it from the path of travel of the switch to permit the switch to be shifted between the on and off position. The socket is keyhole shaped, whereby insertion of the chuck key therein will force the chuck to seat within the lower narrower aperture thereof.