Abstract: A hole saw having a blade portion separable into two parts which when separated form a base portion and a tip portion. The base and the tip have correspondingly shaped apertures and lugs that co-operate together to hold the blade tip in place. A locking means further assists in ensuring that the blade tip remains locked to the base and includes a sliding latch that engages an aperture in the blade and the base and is itself locked in place to thereby lock the blade to the base. An intermediate portion also allows for the hole saw to drill through different depths.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end a base having two holes therethrough. two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough, and an annulus located on top of the body which is coaxially aligned with said mandrel and hole saw. The annulus includes two shafts co-axial with the mandrel bores, and is rotatable around its longitudinal axis from a first to a second position. In the first position the annulus shafts are aligned with the base holes allowing the shafts to be freely insertable and removable and in the second position the shafts are misaligned to lock the shafts to the base. In one embodiment the mandrel bores are shaped to accommodate rotation of the shafts, and in a further embodiment, the shafts are configures to rotate within circular mandrel bores.

Abstract: A hole saw having a blade portion separable into two parts which when separated form a base portion and a tip portion. The base and the tip have correspondingly shaped apertures and lugs that co-operate together to hold the blade tip in place. A locking means further assists in ensuring that the blade tip remains locked to the base and includes a sliding latch that engages an aperture in the blade and the base and is itself locked in place to thereby lock the blade to the base.

Abstract: A hole saw having a central body portion adapted to receive a hole saw blade portion. The body and the blade have correspondingly shaped apertures and lugs that co-operate together to hold the blade in place. A locking means further assists in ensuring that the blade remains locked to the body and includes a sliding klatch that engages an aperture in the blade and the body and is itself locked in place to thereby lock the blade to the body.

Abstract: The present invention relates to a hole-saw assembly includes a hole-saw having at one end a plurality of cutting teeth and with a boss attached to the hole-saw at the other end two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores there through coaxially aligned with said shafts. An annulus 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 adapted to engage driving apertures found in hole-saws especially larger ones.

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.

Abstract: The present invention relates to a dual lock apparatus (10) of the type including a locking bolt (14) moveable between a first locked position and a second unlocked position said bolt movement corresponding with longitudinal movement of a slider (26) said apparatus including a first and a second locking means adapted to operate independently of one another. The first locking means (74) includes a rotatable cam (76) such that when rotated said cam acts against a moveable piston to thereby move said piston from a first position to a second position in which the second locking means becomes disengaged from said slider and further rotation of the cam urges longitudinal movement of the slider.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough coaxially aligned with said shafts. An annulus 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. Such an arrangement allows the hole-saw and the mandrel to be easily and quickly mountable and demountable.

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.

Abstract: The present invention relates to an improved hole saw boss (10) and in particular, to a boss including a threaded member (12) adapted to accommodate two hole saws of the same or different bore thread diameters. The present invention allows for a pre-existing aperture (22) in a work piece to be simply enlarged. This is useful if a new lock mechanism is being installed in a door with a pre-existing aperture where the lock mechanism requires a larger aperture than that which was in existence. Currently the aperture has to be enlarged by manual handwork since there is no centre-point to which a pilot drill may be enlarged. The threaded bore diameters of the present invention correspond with the commonly available hole saw threaded bore diameters. The present invention therefore provides the public with device for enlarging apertures which is simply, cost effective and can be used with currently available hole saws.

Abstract: The present invention relates to a hole-saw assembly includes a hole-saw having at one end a plurality of cutting teeth and with a boss attached to the hole-saw at the other end two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores there through coaxially aligned with said shafts. An annulus 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 adapted to engage driving apertures found in hole-saws especially larger ones.

Abstract: A hole saw having a central body portion adapted to receive a hole saw blade portion. The body and the blade have correspondingly shaped apertures and lugs that co-operate together to hold the blade in place. A locking means further assists in ensuring that the blade remains locked to the body and includes a sliding klatch that engages an aperture in the blade and the body and is itself locked in place to thereby lock the blade to the body.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end a base having two holes therethrough. two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough, and an annulus located on top of the body which is coaxially aligned with said mandrel and hole saw. The annulus includes two shafts co-axial with the mandrel bores, and is rotatable around its longitudinal axis from a first to a second position. In the first position the annulus shafts are aligned with the base holes allowing the shafts to be freely insertable and removable and in the second position the shafts are misaligned to lock the shafts to the base. In one embodiment the mandrel bores are shaped to accommodate rotation of the shafts, and in a further embodiment, the shafts are configures to rotate within circular mandrel bores.

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.

Abstract: The present invention relates to a dual lock apparatus (10) of the type including a locking bolt (14) moveable between a first locked position and a second unlocked position said bolt movement corresponding with longitudinal movement of a slider (26) said apparatus including a first and a second locking means adapted to operate independently of one another. The first locking means (74) includes a rotatable cam (76) such that when rotated said cam acts against a moveable piston to thereby move said piston from a first position to a second position in which the second locking means becomes disengaged from said slider and further rotation of the cam urges longitudinal movement of the slider.

Abstract: A method for measuring the range to multiple points on a surface by projecting a line of light onto the surface, imaging said line of light onto a photodetector, computing the centroid of said line of light, computing quality factors for each computed centroid and encoding the quality factors as one or more bits in the centroid value, transmitting said centroid value to a data receiver, and computing the range to the surface for each point corresponding to each centroid value.

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.

Abstract: A hole-saw assembly including a hole-saw having at one end a plurality of cutting teeth and at the other end two shafts. The assembly includes a mandrel coaxially aligned with said hole-saw and including a body having two bores therethrough coaxially aligned with said shafts. An annulus 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. Such an arrangement allows the hole-saw and the mandrel to be easily and quickly mountable and demountable.