Hole saw

Abstract: The present invention relates to a hole-saw assembly (10) including a hole saw (26) having at one end a plurality of cutting teeth and at the other end two shafts. The assembly includes a mandrel (16) coaxially aligned with said hole-saw and including a body having two bores there through coaxially aligned with said shafts. An annulus (20) located on top of the body is coaxially aligned with said mandrel and hole saw and includes two holes, the annulus rotatable around its longitudinal axis from a first to a second position. In the first position the annulus holes are aligned with the bores and shafts allowing the shafts to be freely insertable and removable and in the second position the holes are misaligned to lock the shafts to the annulus. The mandrel further includes a pair of driving pins (22) adapted to engage driving apertures (24) found in hole saws especially larger ones. Typically the driving pins may biased to enable the assembly to be used even with those hole saws that do not include driving apertures and that also enables easier assembly of the device. A compressible O-ring (42) may further facilitate the operation of the assembly. This device avoids the problem of thread stripping.

Abstract: The hole saw assembly (30) provides a structure and method for efficiently and securely connecting a hole saw (32) to an arbor (34) and easily connecting a pilot bit (36) to the arbor (34). The arbor (34) has a shank (62) opposite a coupling end (66) and a receiving slot (76) proximate to the coupling end (66). The receiving slot (76) is adapted to receive a mounting tag (46) of the hole saw (32) to couple the hole saw (32) to the adapter body (64). The arbor (34) also includes a selector sleeve (70) slidably coupled to the body (64) for movement between a first position allowing the receiving slot (76) to receive the hole saw (32) and a neutral position wherein the selector sleeve (70) prevents removal of the hole saw mounting tab (46) from the receiving slot (76).

Abstract: An arbor for quick change and standard hole cutters, wherein each hole cutter includes a central aperture and at least one drive pin aperture. The arbor comprises an arbor body including an end portion engageable within the central aperture, a drive shank opposite the end portion for engaging a power tool, and an aperture for receiving a pilot bit. The arbor further comprises a drive pin plate and/or collar having at least one drive pin receivable in a corresponding drive pin aperture of the hole saw for drivingly engaging the hole saw. The arbor, in at least one embodiment, further comprises a pilot bit mechanism for engaging and releasing a quick change or standard pilot bit.

Abstract: A mandrel assembly is usable with a hole saw and a drill bit The mandrel assembly includes a body having a shank portion and an adapter receiving portion The adapter receiving portion defines an adapter receiving cavity and including a first wall having a first detent hole extending therethrough The mandrel assembly further includes a bit coupler secured to the body The bit coupler is located within the adapter receiving cavity and defines a drill bit receiving portion The drill bit receiving portion includes a bit receiving cavity and a second wall having a second detent hole extending therethrough The mandrel assembly further includes an adapter configured to be received within the adapter receiving cavity, the adapter having an externally threaded portion configured to meshingly engage with a set of internal threads of the hole saw, the adapter further having a first detent groove defined in an outer surface thereof The mandrel assembly also includes a first ball detent located within the first detent hole of the body and is configured to be received within the first detent groove of the adapter Moreover, the mandrel assembly includes a second ball detent located within the second detent hole of the bit coupler and is configured to be received within a second detent groove of the drill bit