Abstract: The present invention relates to a hole saw that is mounted on an electric drill to cut a hole formed on a flat plate such as a ceiling, and more particularly, to a hole saw with hole enlargement guide and support pieces detachable therefrom that is capable of cutting a hole with a larger size (diameter) than a hole already cut in a ceiling.

Abstract: An apparatus may comprise a shaft, a cutter, and a sleeve. The shaft may have a first end, a second end, and an axis extending through the shaft. The cutter may be associated with the shaft and may have a first channel configured to receive the first end of the shaft and a portion of the shaft. The sleeve may be configured to move along the axis within the first channel of the cutter, may have a second channel configured to receive the first end of the shaft and the portion of the shaft, and may be configured to be biased away from the second end of the shaft.

Abstract: A compact assembly for aligning a coring tool relative to a pipe sidewall. The coring tool includes a hollow, cylindrical hole saw mounted to an arbor that has an elongated pilot shaft centered in the hole saw. The assembly is made up of a base plate that is attachable to the pipe sidewall. In one embodiment, a tubular sleeve is mounted to the base plate and has a bore diameter sized for receiving the pilot shaft as the hole saw is advanced toward and saws through the pipe wall, and the entire assembly is sized to fit inside the hole saw as the hole saw saws through the pipe sidewall. In another embodiment, the base plate is configured for use with pipe sidewalls that include outwardly protruding ribs.

Abstract: A telescopic handle for a hand tool includes a main shank connected to a tool head at a distal end and insertable into an outer sleeve which a user grips. The main shank has a plurality of axially spaced retained regions such that a radially movable retaining member is engageable with a selected one of the retained regions. A key-and-keyway mechanism is disposed to guide axial movement of the outer sleeve and to guard against rotation of the outer sleeve relative to the main shank so as to permit delivery of an appropriate torque to the main shank. An operating member is disposed on and movable axially relative to the outer sleeve to radially move the retaining member.

Abstract: A method of adjusting the length of a vehicle brake booster output rod and assembling the same into the brake booster is provided, the output rod being a thermoplastic or thermoset material that is generally cylindrical in shape with a central longitudinal bore with an axial stop means, and the output rod having an insertable button having a head with an attached stem, the booster having a housing with a central opening surrounding the output rod with a surrounding first formed surface for mounting a master cylinder, the method including piloting a cutting tool by inserting an elongated member into the bore of the output rod, orienting the cutting tool by mating a fixture locationally associated with the cutting tool on the first formed surface of the vacuum booster housing, preloading the output rod with the elongated rod by contacting means with the elongated rod to simulate a spring load of a master cylinder, cutting the output rod with the cutting tool to the correct dimension, removing the elongated memb

Abstract: A cutter for use in making plugs of wood or the like to be used in the insulation industry for plugging holes made in order to provide insulation in an existing structure. The cutter is adapted to be held in a chuck or the like for rotation about a central axis defined by a holder, with a pilot being spring biased in the holder and having a centering tit for locating the wooden plug as it is being cut. Four steel cutters are provided in circumaxially spaced relationship around the axis, and two of these are oriented at a slightly different angle than the other two such that the plug can be cut with two distinct tapers, such that the steeper plug taper permits the plug to be first located in the hole to be plugged, and a shallower slightly larger diameter tapered portion for securing the plug in the hole. Each cutter is adjustable in the holder, and is held in place by a screw with any number of shims being provided in order to cut plugs of different size.

Abstract: An adapter for use with a hole saw for removing a riveted metal patch that covers a preexisting hole in the skin of an aircraft, and thereafter for cutting out a circular portion of the skin, and a blanket behind the skin, without damage to a fuel tank behind the blanket.

Abstract: A tool for removing a disk or cylindrical core from a workpiece which includes a shank, an extension piece and cutting elements, the extension piece being in the form of a hollow cylinder and including apertures in the wall thereof for the introduction therein of a coolant. An axially movable centering element is positioned with the extension piece, the centering element including a centering spigot which fits into a cup-shaped centering piston, plate springs within the piston and against which the centering spigot is movable, and an elastic ring therearound for contact against the inner wall of the hollow cylinder.