Abstract: A bit for a core drill of the type for drilling a chamfered hole in an article has a dynamic cooling fluid flow directing element for cooling the bit and article surfaces during drilling and chamfering of the article.

Abstract: The present invention includes an insert securably mountable within the chamber of a core drill, such as a chamfering diamond core drill used for drilling and chamfering glass articles. The insert preferably includes a first diverting facility for diverting a first portion of a lubricating/cooling fluid from within the core drill to the inner drilling surfaces of the core drill, and a second diverting facility for diverting a second portion of the lubricating/cooling fluid to the outer drilling surface and chamfering surface of the core drill, to prevent thermal damage to the article being drilled and chamfered, during both the drilling and chamfering steps. The present invention further includes a method of lubricating/cooling an article during drilling and chamfering operations with lubricating/cooling fluid from within the core drill, to prevent thermal damage to the article being drilled.

Abstract: A drill press and stand providing an improved apparatus for cutting holes in plate vitreous material. The drill press includes a drill motor, a drill tool attached to the drill motor for cutting through the work piece, and a motor support interconnecting to and supporting the drill motor on the stand. The stand includes a base which is attachable to the work surface by a large suction cup which is attached to the lower surface of the stand base. The stand also includes a collar integral to and generally perpendicular to the upper surface of the base into which a mating drill press standard, a part of the motor support may be inserted. The motor support also includes a positioning mechanism for longitudinally moving the drill motor along the standard and may include a biasing spring to counteract the weight of the motor, etc.

Abstract: A new and improved hole saw construction providing a low cost hole saw mandrel with improved driving capability. A unique drive washer cooperates with radial stiffening ribs on a hole saw blade to effect the improved driving capability.

Abstract: A process for machining glass by placing a rotating carbide working surface under minimum pressure against an area of glass to be worked and concurrently wetting the region between the working surface and the area of glass with a lubricant consisting essentially of a petroleum carrier, a complex mixture of esters and a complex mixture of naturally occurring aromatic oils.

Abstract: A portable lightweight drill assembly is mounted against one side of a sheet of flat glass having a hole or crack to be repaired; the drill shaft extends through the hole or crack to mount cutters on both sides; the cutters are spring biased against the glass to exert equal cutting force and simultaneously rotatable with the drill shaft to cut the hole from both sides to a diameter larger than the hole to be repaired, for insertion of a glass repair plug.

Abstract: In a device for drilling rock, concrete, reinforced concrete and similar materials, a spindle is rotatably mounted in a housing and a drilling tool is replaceably mounted on the spindle so that the spindle and drilling tool rotate together. A gear wheel is fitted on the drilling tool. A motor is located on the housing laterally spaced from the axis of rotation of the spindle. The motor includes a drive pinion which drives an intermediate gear. The intermediate gear meshes with the gear wheel and drives the drilling tool and spindle. The spacing between the axis of the intermediate gear and the spindle is adjustable.

Abstract: This disclosure relates to apparatus and method of forming circular holes in plate glass. A circular cut is made in the glass to a predetermined depth, which is less than the thickness of the glass by approximately 0.5 to 1.0 mm. After this cut has been made, the cutting apparatus is removed and the glass is softly struck adjacent to the circular cut in order to break loose the glass disc enclosed by the cut. The edge or margin of the hole may then be smoothed by grinding or polishing. The glass cutting apparatus includes a circular saw or glass cutter which is rotated to cut the glass. A stopper of the apparatus is adjustably mounted adjacent the cutting edge of the saw and stops the saw from cutting further after a predetermined depth has been reached. The position of the stopper may be adjusted for different thicknesses of glass.

Abstract: A drilling accessory for collecting dust and other debris when drilling a hole in a workpiece. The accessory having a handle for hand holding the device and a hollow open ended dust collector attached to the handle. One end of the dust collector is provided with a split rubber cover spanning the interior of the dust collector through which cover a drill bit may be inserted to engage the workpiece to be drilled. When a forward end of the dust collector is placed adjacent the workpiece to be drilled, and drilling commenced, dust and other debris resulting from drilling will be collected and held inside the dust collector.

Abstract: This disclosure relates to apparatus and method of forming circular holes in plate glass. A circular cut is made in the glass to a predetermined depth, which is less than the thickness of the glass by approximately 0.5 to 1.0 mm. After this cut has been made, the cutting apparatus is removed and the glass is softly struck adjacent to the circular cut in order to break loose the glass disc enclosed by the cut. The edge or margin of the hole may then be smoothed by grinding or polishing. The glass cutting apparatus includes a circular saw or glass cutter which is rotated to cut the glass. A stopper of the apparatus is adjustably mounted adjacent the cutting edge of the saw and stops the saw from cutting further after a predetermined depth has been reached. The position of the stopper may be adjusted for different thicknesses of glass.

Abstract: Improved core drills and core drill elements. The core drill is of the type having a carrying drill tube and at least one cutting element attached to one end of drill tube. In the present invention, structural means are provided on one end surface of the cutting element extending over the entire length of the end surface to receive all or a portion of the one end of the drill tube to strengthen the core drill. The invention is also directed toward a method for making the improved core drill and a method for reconstructing it. The cutting elements can be curved or straight.

Abstract: A method for repairing panes of glass is provided which enables fractured panes to be strengthened and holes refilled while the pane remains installed in its support structure. The method comprises steps for relieving stress points in a fractured pane, and for applying substantially transparent materials for filling portions of the pane where glass has been removed or separated. The method enables repair of laminated glass panes as well as solid glass panes.

Abstract: A portable lightweight drill assembly has a cutter mounted against a sheet of flat glass through which a hole is to be drilled; in an alternate embodiment, the drill shaft extends through a hole in the glass and has cutters mounted on both sides of the glass; in each case, the cutters are biased against the glass by a fluid pressure actuated bellows type servo constructed to exert a constant cutting force against the glass surface by means of a self-regulating action of the fluid pressure force.

Abstract: A self-drilling dowel consists of a tubular-shaped member with a drilling head at one end. The drilling head is formed of a plurality of teeth each having a tip. The tip of the teeth are all disposed in a single plane inclined at an angle to the axis of the tubular-shaped member. A line perpendicular to the plane containing the tips of the teeth and intersecting the axis of the tubular-shaped member is disposed to the axis at an angle in the range of 4.degree. to 9.degree.. The teeth are formed by a cutter with its center located at an offset position from the axis of the tubular-shaped member. The feed line of the cutter extending through its center can be parallel to the axis of the tubular-shaped member or it can be set angularly to the axis of the tubular-shaped member in the range of 4.degree. to 9.degree. or 81.degree. to 86.degree. depending on whether the cutter is moved generally in the axial direction or transversely to the axial direction of the tubular-shaped member.

Abstract: A support device for a pipe driller and particularly for sewer pipe which eliminates excavation from the underside of the pipe. A support means engages a standard pipe driller and arm members extend from the support. The arm members are pivotally secured to the support and extend in one direction to partially surround the pipe. The arm members also extend in the opposite direction and are operable with screw means to secure the opposing arms against the pipe. The pipe contacting portions of the arm are preferably arcuate in configuration and surround the pipe over not more than ninety degrees of its radius and above the lowermost portion of the pipe.

Abstract: A device is provided for creating recesses for road surface markers in road surfaces which makes initially a cut sufficient to stabilize the device in the desired position and then fragments and discharges core material within a circular cut defining the recess. Such fragmentation is effected by rotation of a plurality of radially disposed cutting edges each spanning only a portion of the radius of the material to be fragmented.

Abstract: A system for repairing a crack in a pane of plate glass in which a rotatable shaft extends through the glass and carries cutters on both sides for concurrently cutting an aperture therein from both sides.

Abstract: A rotary bit for drilling concrete and reinforced concrete having a hollow drill stem with a transversely disposed drilling face at its outer end, the face having annularly disposed sawtooth surfaces including abrupt step portions alternating with trailing portions extending from the apex of a step to the root of the succeeding step, the trailing portions having diamond chips thereon and comprising crushing and grinding surfaces for the cuttings, and being sloped radially outwardly and axially upwardly to displace particles toward the outer periphery of the bit, and the bit having particle escape channels up its side surface adjacent the leading edges of the step portions which have hardened cutter inserts.