A quick-release arbor is adapted for a cylindrical hole saw that has a bottom wall having a threaded central aperture and opposing indexing holes. The arbor has a central hexagonal passage with opposing key slots passing therethrough and a threaded hole saw fitting axially aligned with the hexagonal passage. The arbor has a hexagonal pilot shaft securely holding a pilot drill bit and intermediate opposing keys forming a position lock. The pilot shaft is adapted to freely pass through the passage. Within the arbor is a button chamber that is transverse to the hexagonal passage with a rear wall. A biased button is located within the button chamber having upper and lower cuts outs to permit the pilot shaft to freely pass through the cut outs of the button when the button is depressed and having rear pocket to capture one of the pilot shaft opposing keys when the button is released.

A system is disclosed for releasable coupling of a hole saw to a drill arbor. The system includes an elongate drill arbor configured at a first end to be clamped in a drill chuck of a drill, and a hole saw adapter provided with a longitudinal bore in which the drill arbor can be received so that an inner surface of the longitudinal bore of the hole saw adapter is mounted slidably on an outer surface of the drill arbor in the longitudinal direction of the drill arbor. The drill arbor includes an actuator member and at least one retaining element co-acting therewith. The inner surface of the longitudinal bore of the hole saw adapter is provided with a recess into which the retaining element of the drill arbor can protrude.

A combination system of fixed arbor hole saws and quick-change mandrel that enables a user to drill multiple of same sized or different sized holes in desired substrate in a quick and hassle-free manner. A drill bit held and retained in the quick-change mandrel serves as a common pilot for all different fixed arbor hole saws. The combo system requires a single common quick lock mandrel that positively locks a hole saw on insertion. The securely locked hole saw can be released with easy pull on a collar in the mandrel. Also, the cut-out slug of any substrate is very easy to remove once the hole saw is released from the mandrel.

A new, innovative tool useful in fluidly coupling a lateral pipeline to a reinstated pipeline containing a continuous liner is provided. The pipeline reinstatement tool includes a flexible shaft that is coupled to a cutting head at a first end and a coupling assembly at a second end. The cutting head includes a hollow cylindrical member having cutting teeth that project longitudinally from the first end of the hollow cylindrical member. The tool includes a first compressible tensioner portion disposed about the flexible shaft proximate cutting head, a second compressible tensioner portion disposed about the flexible shaft proximate the coupling assembly, and a flexible sleeve portion disposed about the flexible shaft between the first compressible tensioner portion and the second compressible tensioner portion.

A quick connect/disconnect mechanism for a rotary bit having a central mounting hole at a proximal end includes a shaft extending axially and having a proximal end adapted to be releasably secured in a rotary tool and a distal end having a spud extending distally and axially therefrom. A plurality of retainer arms are arrayed about the axis and extending distally, each retainer arm including a catch extending radially outwardly from a distal end thereof. A release sleeve extends about the shaft adjacent to said distal end, the release sleeve having engagement keys to impinge on the proximal ends of the retainer arms, the sleeve being rotatable from a first position in which the engagement keys hold the retainer arms to secure the rotary bit to a second position in which the retainer arms rotate to release the rotary bit.

A hole saw assembly having a drive shaft, drive disk and hole saw blade. The drive disk has a plurality of radially extending projections that engage with engagement slots in the side of the hole saw blade.

A support assembly for a core drill uses an improved reinforcement. The reinforcement can include an extension extending between a center of the tool and a perimeter of the tool the extension can be a non-planar structure having a channel along a portion of the structure. The reinforcement can include a slanted element that can be associated with the extension, that can be formed monolithic with the extension, or otherwise combined with an extension. Multiple slanted elements can be used to form an extension. A top plate can be included for strengthening the reinforcement.

The shank (12) of a disposable rotary cutting tool (10) comprises a pipe section (16) cut from a drawn metal pipe. The tool head (14) is formed from a cut-out (18a, 18b) of a drawn metal sheet or a section of a metal tube by non-cutting machining. The pipe section (16) and the tool head (14) are advantageously attached by force fitting.

The hole saw with threadably removable portion is an improved hole saw that includes a removable portion that is able to slide back and forth with respect to an outer drill bit. The outer drill bit includes internal threadings along an inner surface, which correspond with external threadings provided on an outer surface of the removable portion. When the hole saw has bored a hole into an object, a core remains inside of the outer drill bit. The rotation of the drill rotates the removable portion with respect to the outer drill bit in order to push the core out of the outer drill bit. The outer drill bit includes a shoulder, which works in concert with the removable portion so as to lock the components together when in use as a hole saw.

The invention relates to a core drill with an end portion (3) and a drill bit portion (1-2). The end portion and the drill bit portion are joinable in a watertight fashion with a sealing element (11). The sealing element (11) is provided in a space between the end portion and the drill bit portion, such that it is being compressed in a sealing fashion when the end portion and the drill bit portion are joined. The end portion and the drill bit portion are locked together with a joining element (8, 10) which achieves this locking effect when moves in the radial direction of the core drill. When the joining element moves in this direction, the end portion and the drill bit portion move towards each other. Thus the sealing element is being compressed while concurrently the end portion and the drill bit portion are joined together. This is further achieved without the joining element having to extend in the axial direction of the core drill. Typically, the joining element (8, 10) is constituted by a set screw.