Abstract: Disclosed is a safety handle that is rotatively mounted on the existing front handle of the chain saw and is operatively connected to the existing on-off switch to independently actuate such switch to shut off the engine and stop the cutting chain upon rotation of such safety handle to its "off" position either automatically when kick-back occurs or upon such rotation by the human operator at his option. A wrist guide struck by the human operator's hand during severe kick-back or when the chain saw is dropped similarly rotates the safety handle to its "off" position. An automatic reset mechanism restores the safety handle to its "on" position after the safety handle has been rotated to its "off" position and released.

Abstract: Disclosed is a closure member for insulating, sealing, waterproofing and otherwise protecting an object from the elements. The closure member is of integral, one-piece construction, is of heat-shrinkable material, has a main body for enveloping the object and easily hand-assembled hooks, formed from material-sandwiched, angled and articulated inserts, interfoldable to define a joint and form thereby an enveloping tubular member. The hooks have on their ends small projections defining detents that are mechanically imbeddable for positive joint closure and seal, while affording a wide range of alignment in the interfolded and sandwiched assembly of the hook.

Abstract: Discloses a switch for use with a circuit board for simultaneously closing one or more circuits. A switch cover mounts therein a reciprocable member whose permanent strip magnet carries one or more contact elements for circuit completion. The circuit board carries another permanent strip magnet. The strip magnets have consecutive, alternating polarities such that, in the closed position of the switch, the strip magnets have opposite attracting polarities, and such that, in the open position of the switch, the strip magnets have the same and repelling polarities.