Abstract: A roofing hatchet having a magnetic striking face is hereby disclosed. A unique shouldered cap housing the magnet dampens the forces transferred from the striking by transferring the force directly to the hatchet head, bypassing the magnet, thereby preventing demagnetization typically caused by such repeated linear forces. Additional features include a cutting blade housing adapted to adjustably receive a variety of different commercially available utility knife blades, an adjustable gauge for gauging a distance from the bitted end of the hatchet, and a pulling notch for pulling fasteners from a surface. Unlike prior art hatchets, the handle of the inventive hatchet is angled, relative to the striking face, such that the force transfer from the hand of a user to a fastener being driven into a sloping surface is optimized.

Abstract: A mold assembly is made up of a nozzle tip and a nozzle tip receiving housing. The nozzle tip has an outwardly projecting shoulder and a threaded base and the housing has a hollow stem with an internal recess and a threaded socket for receiving the base of the nozzle tip. The assembly further includes a locking member having both internal and external projections. The locking member fits over the nozzle tip with the external projection of the locking member locating within the internal recess of the housing stem and with the outwardly projecting shoulder of the nozzle tip trapped by the internal projection of the locking member to block unthreading of the nozzle tip from the housing.

Abstract: A mold assembly is made up of a nozzle tip and a nozzle tip receiving housing. The nozzle tip has an outwardly projecting shoulder and a threaded base and the housing has a hollow stem with an internal recess and a threaded socket for receiving the base of the nozzle tip. The assembly further includes a locking member having both internal and external projections. The locking member fits over the nozzle tip with the external projection of the locking member locating within the internal recess of the housing stem and with the outwardly projecting shoulder of the nozzle tip trapped by the internal projection of the locking member to block unthreading of the nozzle tip from the housing.

Abstract: The present invention provides a mold with gas ejection of pieces formed in the mold. The mold includes a female body part and a male body part. The male body part includes a male molding surface with a surrounding plastic injection shut off face and a reciprocable gas controlling blow off pin slideably trapped within a pin recess at the shut off face. The pin has an enlarged bottom portion and a narrowed upper portion with a gas passage starting upwardly through the lower bottom portion into the upper portion and opening sideways through the pin which has a solid top surface above the sideways opening. The pin receiving recess has an undercut configuration including a small diameter upper region and a larger diameter base region with clearance for sliding of the pin in the recess. The clearance is at a minimum near the solid top surface of the pin and increases downwardly from the upper to the lower portion of the pin.

Abstract: The present invention provides in a stack mold with back to back centrally located mold cavities a multiple sprue bar arrangement including a pair of sprue bars balanced on opposite sides of the mold and connecting bridge across the sprue bars for interfacing to a plastic injector. At least one of the sprue bars provides a plastic flow path from the connecting bridge to the mold cavities.

Abstract: The present invention provides in a stack mold comprising a center mold part, first and second outside mold parts moveable at both sides of the center mold part, a rack and pinion gear arrangement to move the outside mold parts. The rack and pinion gear arrangement comprises a plurality of pinion gears located at the center mold part and including a drive gear and first and second follower gears driven off the drive gear. Also provided are first and second free ended racks extending in opposite directions from the first and second outside mold parts respectively in engagement with the first and second follower gears. These follower gears reach above and below the drive gear and the first follower gear is offset to the side of the drive gear opposite that to which the free end of the first rack extends while the second follower gear is offset to the side of the drive gear opposite that to which the free end of the second rack extends.