A hole saw alignment guide for enlarging a hole in an object to provide a larger diameter hole in the object. The hole saw guide includes a first cylindrical part having a first end adapted to the size of, and adapted to be inserted into, the hole that is to be enlarged. The hole saw guide also has a second cylindrical part integral with the second end of the first cylindrical part. The hole saw guide is adapted to receive over the outer surface of the first cylindrical part a toothed end of a hole saw sized to provide the larger diameter hole. The second cylindrical part is adapted to extend into an arbor of the hole saw and to be secured to the arbor for rotation with the hole saw. The arbor of the hole saw is adapted to be received in a drill chuck.

A hole saw, including a rotatable drill bit, a plurality of rotatable saw jaws disposed around the drill bit to encase at least a portion of the drill bit therewithin when the rotatable saw jaws are in a closed position, a fixed locking collar portion disposed at base ends of the plurality of rotatable saw jaws, and a movable locking collar portion to move with respect to the fixed locking collar portion, such that the plurality of rotatable saw jaws pivot away from each other into an open position as the movable locking collar portion moves away from the fixed locking collar portion.

This invention provides the means for construction crews to easily drill through multiple beams or soffits with the use of a hole saw that is coupled to a first drive cup using a coupling arbor. The first drive cup is attached to a first end of an extension tube and is secured using self-tapping screws. A second drive cup is attached to a second end of the extension tube with self-tapping screws where a drive coupling arbor provides a hexagonal shank that is attached to a drive device, such as a hammer drill or standard drill. When activated the rotational motion allows the hole saw to cut through the beams or soffits. A pilot bit is provided to guide the hole saw into the beams or soffits when in use.

A repair kit for repairing a damaged area of a workpiece includes an arbor and a cutting member. The cutting member is removably coupled to the arbor and includes a side wall that has a first end and a second end. An end cap is coupled to the first end and abuts an abutment surface of the arbor. A plurality of cutting elements is coupled to the second end of the side wall, and a retention feature extends outwardly from the side wall. The cutting member is rotatable by the arbor to cut a hole in the workpiece. The retention feature is configured to engage the workpiece as the cutting member cuts the hole to secure the cutting member within the hole. The arbor is removable from the cutting member while the retention feature engages the workpiece to leave the cutting member in the workpiece to plug the hole.

A method to repair a damaged area of a workpiece with a repair kit includes rotating an arbor to drive a cutting member about a central axis of the arbor, cutting a hole in the workpiece with the cutting member, engaging the workpiece with the cutting member as the hole is cut to secure the cutting member within the hole, disconnecting the arbor from the cutting member, and leaving the cutting member in the workpiece to plug the hole.

The present invention seeks to provide a simple, easily realisable and inexpensive solution to the problems discussed above. The present invention further seeks to provide a hole-saw device which enables rapid changes of hole saw. The present invention also seeks to provide a simple device for enlarging apertures which is simple, cost effective and can be used with standard drills of corded and battery types as well as manual types.

A pilot pin assembly is slidably receivable within a tool bit of a drill press. The pilot pin assembly includes a first pin defining an interior cavity, and a second pin at least partially received within the interior cavity of the first pin. A spring is positioned within the interior cavity for biasing the second pin toward an extended position relative to the first pin.

A cutting tool is provided that is operable to provide a circular cut or hole in a material or work piece. In various embodiments, a guide member is provided that facilitates alignment of a cutting edge of the invention with a pre-existing cut, hole or aperture. Devices and methods of the present disclosure provide for quick and easy centering of a cutting tool in order to form an enlarged hole that is concentric with a pre-existing hole.

A hole cutting accessory for a power-driven tool may include an arbor that provides for quick release of an annular saw blade component of the accessory, and for quick release of a pilot drill bit component of the accessory. The quick release of the annular saw blade component from the arbor may be accomplished separately from the quick release of the pilot drill bit component from the arbor.

The disclosure concerns a system for hole drilling in an object (400) comprising a core drilling machine (100), a core drill bit (200) and a reaction bar (300) arranged for transmitting rotating reaction forces from the core drilling machine (100) to the object (400), where the core drill bit (200) is connected to the core drilling machine (100) and the core drilling machine (100) is equipped with a power source (108) in order to apply a rotating force to the core drill bit (200), and where the core drill bit (200) has an axially extending tubular shaft (202) with an inner envelop surface (203) defining an inner periphery (204) of the core drill bit (200), wherein the reaction bar (300) is non-rotatably connected to the core drilling machine (100) and arranged inside the inner periphery (204) of the axially extending tubular shaft (202) of the core drill bit (200). The disclosure further concerns a core drill bit (200) and a core drilling machine (100) for hole drilling in an object (400) and a method for hole drilling in an object (400) with a core drilling machine (100), a core drill bit (200) and a reaction bar (300) arranged for transmitting rotating reaction forces from the core drilling machine (100) to the object (400).