Abstract: The invention is an improved endodontic apparatus device for holding instruments, particularly endodontic drill files that are energized and vibrated by ultrasonic means. The invention also provides for the flow-through of solutions during debriding and irrigating of root canals. The invention consists of a hollow tube-like means for conducting solution and directing it in the axial direction of the endodontic drill file; the hollow tube-like means incorporates a special holding means at the outboard end thereof for mounting the drill file in a position so that ultrasonic waves can be transmitted to the drill file to cause it to vibrate in a manner that improves debriding of the root canals. The special holding means at the end of the hollow tube-like means retains the drill file in a firm position to receive the transmitted ultrasonic waves.

Abstract: A hydraulic chuck having a piston means with an axially centered passage, the first end of which has a tube seating means associated therewith for engaging a tube. Collet means are provided and located at the first end of the piston means for engagement of the tube upon closure of the collet means. Biasing means operably connected to the piston means for normally forcing the surface means upon the collet means are also provided. Sealing means adjacent to tube feeding means for sealing the tube to the chuck, including seal seat means adjacent to collets and positioned to compress the seal radially inward under pressure of the biasing means, are provided. Finally, the handle or attachment means is provided to operably connect to the biasing means to remove the surface means from the collet means, thereby releasing the radially inward compression of the sealing means and permitting insertion of the tube.

Abstract: A tool for introducing self-tapping dowels in a structure by a drilling process which is accompanied by the generation of large-size drillings, has a shaft connectable with a drive, a dowel holder connectable with the shaft and having a receiving bore which includes a first section adapted to receive a dowel shank and a second section adapted to receive the large-size drillings, and a suction arrangement movable relative to the dowel holder to and from an operative position in which it communicates with the second portion of the dowel holder and draws air therethrough to thereby suck the large-size drillings into the second section of the dowel holder bore wherein they are retained during the drilling process.

Abstract: A tool holder includes a shank that has an axial passage therethrough for conducting coolant. The end of the shank remote from the cutting tool has a hollow stop screw which determines the effective length of the tool holder and which contains a check valve assembly, thus enabling the tool holder to be used in machine tools that rely upon the build-up of an air pressure as a consequence of insertion of the tool as one of its control functions.

Abstract: A dental handpiece having a rotor housing with a chamber, a rotor within the chamber, and an improved spring grip chuck. The chamber has upper and lower openings coaxial therewith, the rotor has a bore aligned with the openings, and the chuck is received within the bore. The chuck is fixed to the bore and has a plurality of tapered spring jaws at its upper end which normally slope inwardly for frictionally contacting and holding a dental bur. The upper end of the bore is provided with a pusher nut which is accessible by means of a suitable wrench through the upper opening in the housing and which is adjustable for engaging and forcing open the jaws to permit removal and replacement of the bur.

Abstract: A Floating Tool Holder includes a shank having an annular sleeve secured to one end thereof, there being a tool chuck assembly retained between the end of the shank and a flange on the sleeve, driver means for transmitting rotary motion from the shank to the tool chuck assembly, there being a pair of annular bearings which engage the tool chuck assembly and enable slight relative radial movement, the bearings having flat surfaces which constitute a thermal diffusion of a metal boride, such as di-iron boride. There is a seal between the tool chuck assembly and the sleeve, and centering means acting between the shank and the tool chuck assembly and constructed to enable the conducting of a coolant through the shank into the tool chuck assembly, certain components being further constructed to enable length of the device to be minimized. The tool chuck assembly has a deep hole receptive of a substantial portion of a tool.

Abstract: A Tap Driver Assembly for use between a spindle that is adapted to provide a coolant and a tap that is adapted to conduct such coolant therethrough, the tap driver assembly including a body in which a nose is slidably guided, a collet clamped by a nut in such nose, a slidable drive connection between the body and the nose which enables relative axial movement while providing an angular drive, spring means acting between the nose and the body so that the feed of the tap could lead or lag the feed of the spindle, and a fluid passage in the body leading from the spindle in bypassing relation to the slidable drive connection, bypassing the spring means, and extending through the nose, axially into the collet to the tap.

Abstract: A percussion drill in which a piston or ram is driven against the end of a drill rod comprises a tube extending through the piston and reaching into a bore at the end of the drill rod to deliver a fluid thereto for moving debris formed by the drilling operation. A socket is received in a bore of the drill rod and has a resilient lip which is deflected inwardly by the flared mouth of the drill rod bore while the tube has a tapered end which is engaged by the wall of a tapered bore formed in the socket.

Abstract: A tool holder includes a shank adapted at one end to hold a tool and to be clamped in a machine tool at its other end. The shank has a portion that provides accurate radial location, and also has means which are adjustable in order to provide accurate axial location. Such axially adjustable locating means include an elongated ramp accompanied by means defining a flat surface encircled by a lock ring which can engage the adjacent end surface of a portion of the machine tool which holds the tool holder. Any force tending to push the tool holder further into the machine tool is resisted by the inability of the lock ring to move up to a higher portion of the ramp. Preferably, there are a plurality of aligned ramps.

Abstract: In the process and apparatus for removing the drillings from the drilling te of a drill described, removal is effected through a conduit, extending along the axis of a drill and possibly an adapter for a drilling machine, by a vacuum provided by a compressed-air stream traversing the removal conduit, said compressed air also serving to blow the drillings sucked into the conduit out of the conduit and away from the drilling site.

Abstract: Apparatus for underground drilling includes a housing having a bottomed opening in its top and a hole extending downwardly through the housing from the opening. A rotatable chuck is received in the opening and has a vertical bore therethrough with non-circular upper portion for receiving a hollow drill rod, an intermediate portion and an enlarged lower portion having a shoulder at the top thereof. A compressible plug is closely received in the vertical bore and has an enlarged bottom portion with its top bearing against the shoulder and its bottom bearing against the bottom of the chuck bore. The plug has a frusto-conical upper portion which is compressed by the bottom of the hollow drill rod. A hollow adapter is received in the hole in the housing in spaced relationship with the chuck and has sealing engagement with the hole wall.

Abstract: The cutting tool may be employed to shape an internal hole, provide a form to the outer periphery of a workpiece, or shape a hole to a predetermined form while cutting an exterior profile to a desired shape. The tool has a shank with an oval shape flange with a tool-supporting portion having a similar oval shape flange with mating apertures in the flanges. The apertures in the first flange contain a thread while the holes in the second flange are somewhat enlarged. Three set screws are provided in the second flange at each end thereof in engagement with the screws which retain the flanges together. The set screws shift the second flange in any direction relative to the first flange which slopes relative to the axis of the shank so that the tool is offset at an angle to the axis of the shank.

Abstract: An electric welding torch adapted to hold an electrode comprises a helically fluted tube made of flexible material and adapted to surround a portion of the electrode inserted in the tube. Means is provided for mounting the tube in the torch and permitting relative rotation of displaced portions of the tube along the electrode for selectively holding the electrode in the tube by physical engagement of helical land portions of the tube against the surface of the electrode and for releasing the electrode by twisting of the tube in a direction opposite that of the spiral flutes or by application of axial compression of the tube.