Including Cutter Limited To Rotary Motion Patents (Class 409/226)
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Patent number: 8926239Abstract: A piston pin hole boring system and method of forming pin holes therewith includes fixing a piston to a fixture supported by a slide member. Then, rotating a cutting member about a first axis and moving the slide member with the fixture thereon toward the cutting member along the first axis and bringing the piston into cutting contact with the cutting member. Further, moving the fixture along second and third axes, each extending transversely to the first axis and machining the desired pin hole contours in the piston with the cutting member.Type: GrantFiled: August 9, 2013Date of Patent: January 6, 2015Assignee: Federal-Mogul CorporationInventor: Jiancheng Liang
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Patent number: 8756329Abstract: Systems and methods are provided for providing parallel muxing between servers in a cluster. One such system can include a cluster of one or more high performance computing systems, each including one or more processors and a high performance memory. The cluster communicates over an InfiniBand network. The system can also include a middleware environment, executing on the cluster, that includes one or more application server instances. The system can further include a plurality of muxers, wherein each application server instance includes at least one muxer. Each muxer can receive information from a plurality of threads to transmit to a different muxer on a different application server instance over the Infiniband network using a plurality of parallel channels.Type: GrantFiled: May 17, 2011Date of Patent: June 17, 2014Assignee: Oracle International CorporationInventors: Nathan Reynolds, Oleksandr Otenko, Joshua Dorr
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Publication number: 20140072381Abstract: A fixture and cutter tool is described. The fixtures includes features that enable a work piece to be easily mounted and removed by a rotation motion of the work piece onto the top of the fixture. The system includes the fixture and a cutter tool to prepare the work piece for use with the fixture.Type: ApplicationFiled: September 11, 2013Publication date: March 13, 2014Inventors: Chris Taylor, Steve Grangetto
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Publication number: 20130221589Abstract: Manufacturing spectacle lenses using lens blanks blocked onto holding elements is laborious and time-consuming. Furthermore the manufacture is rendered difficult by different surface curvatures on the receiving side of the lens blanks. The purpose of the invention is to remedy such drawbacks. Accordingly this invention relates to equipment for processing lens blanks comprising a workpiece turret supported rotatably about a main axis of rotation, said turret being fitted with at least two workpiece receptacles configured each outside the main axis of rotation and being rotatable about spindle axes, each workpiece receptacle comprising a workpiece receiving surface having a surface curvature rotationally symmetrical about the spindle axis, whereby said surface curvatures of the workpiece receiving surfaces being different from each other.Type: ApplicationFiled: February 26, 2013Publication date: August 29, 2013Inventor: Roland Mandler
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Patent number: 8506215Abstract: A piston pin hole boring system and method of forming pin holes therewith includes fixing a piston to a fixture supported by a slide member. Then, rotating a cutting member about a first axis and moving the slide member with the fixture thereon toward the cutting member along the first axis and bringing the piston into cutting contact with the cutting member. Further, moving the fixture along second and third axes, each extending transversely to the first axis and machining the desired pin hole contours in the piston with the cutting member.Type: GrantFiled: June 24, 2009Date of Patent: August 13, 2013Assignee: Federal-Mogul CorporationInventor: Jiancheng Liang
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Patent number: 6908266Abstract: An apparatus for making microlens molds and microlens array molds is described which utilizes a forming element having a rotating half radius diamond cutting member. A substrate is alignably arranged with the diamond cutting member so that the cutting member can mill a mold cavity in the substrate. The apparatus can be used to make high sag lens molds with high accuracy and a nearly 100% fill factor.Type: GrantFiled: October 31, 2000Date of Patent: June 21, 2005Assignee: Eastman Kodak CompanyInventors: John Border, Robert Dambrauskas, Craig A. Sadlik
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Patent number: 6704768Abstract: A system, method, and computer program product for providing discovery services for servers during a startup sequence can include powering on a server in a domain; creating a listener socket for the server to accept coupling requests from other servers; registering server information for the server with a database; searching the database for other registered servers in the domain; establishing a couple to each of the other registered servers in the domain; and verifying validity of the couple to each of the other registered servers including performing a handshake. The server information registered with the database can include an IP address; a listener port; a domain; a version number; or a server type.Type: GrantFiled: November 8, 2000Date of Patent: March 9, 2004Assignee: Aether Systems, Inc.Inventors: James M. Zombek, Richard K. Sobchak, Rudy G. Bonefas
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Patent number: 6520227Abstract: An apparatus to support a hand held motorized tool in an inverted position that allows easy removal of the tool for hand held purposes. The apparatus is defined by a receiver in a frame and an opening for removal of the tool. A lid may further stabilize the tool. When mounted in the receiver the lateral and upper movement of the tool is restricted. When removed from the receiver the tool has attached to it only a sub base-plate that is comparable in size to the tool. The receiver may be removable or built into a tabletop.Type: GrantFiled: August 8, 2001Date of Patent: February 18, 2003Inventors: Robert E. Mc Farlin, Jr., David L. Henderson
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Patent number: 6491481Abstract: A method for making microlens molds and microlens array molds is described which utilizes a spinning half radius diamond cutting member operated in a plunge cut in a technique similar to milling to cut the optical surface into a diamond turnable material. The method can be used to make high sag lens molds with high accuracy. Microlens array molds can be made with a high degree of uniformity and a nearly 100% fill factor.Type: GrantFiled: October 31, 2000Date of Patent: December 10, 2002Assignee: Eastman Kodak CompanyInventors: John Border, Robert Dambrauskas, Craig A. Sadlik
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Publication number: 20020110433Abstract: A clamping device for a machine tool that is securable to a work table of the machine tool. The machine tool typically has a work table and a saddle. The worktable is slidably mounted to the saddle. An elongated table screw is carried by the work table and extends through threaded block carried by the other saddle. A pair of jaws of the clamping device each have an acurate surface for engaging the elongated table screw. A mechanism moves the jaws relative to each other and into a closed position engaging and retaining the elongated table screw.Type: ApplicationFiled: January 2, 2002Publication date: August 15, 2002Inventor: Vincent P. Marroncelli
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Patent number: 6374879Abstract: A coping machine for making miter cuts on baseboard or crown molding stock includes a work platform supported on vertically movable spring assemblies. Stock to be cut is positioned on the work platform. A rotating cutting knife is disposed adjacent a rear edge of the work platform. Operation of a single lever mechanism functions to move the platform in a downward vertical direction so that the stock may be cut by the rotating cutting knife. The spring assemblies automatically return the platform to its original position when the single lever is released.Type: GrantFiled: October 31, 2000Date of Patent: April 23, 2002Inventor: Brett Lukehart
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Patent number: 6220799Abstract: A machine tool of small scale, light weight, and low cost, yet accomplishing a high degree of precision in machining. A spindle (2) is encased in a body frame (1) and disposed preferably in such a manner that the spindle (2) is movable along an axial center thereof or Z-axis direction by means of a Z-axis moving means (4). Either Y-axis table (5) or an X-axis table (6), at least being capable of moving along X-axis or Y-axis direction, or both is provided at one end of the spindle (2) on one side of the body frame (1) and arranged to be vertical with respect to the axial center of the spindle (2).Type: GrantFiled: November 19, 1998Date of Patent: April 24, 2001Assignee: Matsushita Electric Industrial Co.,Ltd.Inventors: Norio Okutani, Toshiyuki Okada, Yoshimichi Ishii
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Patent number: 6203255Abstract: A router guide apparatus for use in forming rosette designs in a work piece includes a frame having a work surface with a wheel rotatably mounted upon the work surface. The wheel has a plurality of position stops. The rosette design can be formed in a synthetic material (eg. Corian®) and filled with a filler or glue or settable material of a different color to form an inlaid design. The frame includes an adjustable guide for holding and a tracking a router with a cutting blade. The frame includes stops for limiting movement of the router during use. The guide and stops are configured to enable the cutting blade to cut two petals of a rosette design in a single pass. Inserts (fence blocks and/or router filler blocks) can be added to vary the position tracked by the router. The wheel is affixable into multiple angular positions relative to the guide so that multiple cuts can be made at different angular orientations relative to one another.Type: GrantFiled: December 21, 1999Date of Patent: March 20, 2001Assignee: Southern Quality Designs, Inc.Inventor: Dwayne J. Broussard
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Patent number: 6019148Abstract: A door machine is provided for the production of a raised-panel door product of the type having a central panel framed in a sash of left and right stiles and upper and lower rails. In this type of raised panel door, the stiles and rails are joined by four butt joints to form the sash which features four inner edges that join the four edges of the central panel in edge joints. Preferably, the rails extend between and space apart the stiles and as such, these rails have opposite "butt" edges. The door machine includes a stand and a table on the stand formed with openings. The table and stand support a power and drive assembly which includes at least driven three spindles. Each spindle has a head for mounting a knife, and this head protrudes through an opening in the table as slightly above a plane of the table.Type: GrantFiled: August 3, 1998Date of Patent: February 1, 2000Assignee: Country Pride, Inc.Inventor: Michael R. Hansen
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Patent number: 5882156Abstract: A method and apparatus for machining the surface of a spherical segment, the surface being either convex or concave, by a circular milling cutter mounted on a milling machine and rotatably driven about an axis of rotation. The segment is carried by a fixture journally mounted for pivoting about a pivot axis passing through the spherical center of the surface to be cut, and the axis of rotation also passes through the spherical center. The teeth of the cutter lie in a plane perpendicular to the axis of rotation which is the furthest such plane that intersects the face of the cutter so that only the cutting teeth will contact the spherical surface to be formed. The fixture is pivoted about the pivot axis and the segment moves through and is cut by the rotating teeth to form the spherical surface.Type: GrantFiled: June 18, 1997Date of Patent: March 16, 1999Inventor: David Hetzler
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Patent number: 5779407Abstract: A router table fence having three nesting aluminum extrusions or spars, two of which lie under a longer third spar. By positioning the inner ends of the two lower spars adjacent to a router cutter protruding through a router table, it is possible to provide a fence, particularly when the lower spars are used with wood facings or sub-fences, that can be adjusted to closely surround the cutter. Lateral movement of the fence assembly adjusts the amount of cutter that contacts a workpiece manipulated past the cutter while contacting the fence. The cross sectional shapes of the spars are identical and are generally square, with structure that permits the upper, longer spar to rest on top of, and be attached in a manner permitting it to slide against, the lower two spars. T-shaped slots in each face of the spars accept fasteners that connect the spars together and also accept fasteners for a variety of accessories, such as hold-down devices and shields.Type: GrantFiled: January 30, 1997Date of Patent: July 14, 1998Assignee: Lee Valley Tools Ltd.Inventors: Edwin C. Tucker, Michael S. McGuire, Leonard G. Lee, John S. Lynn
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Patent number: 5586591Abstract: A router accessory having a housing with a router attaching portion for adjustable attachment to a router. The router accessory also comprises a plate for fixedly holding a work piece. The work piece support plate has a plurality of arms extending therefrom. There is also a plurality of track mechanisms attached to the housing. The arms are slidably attached to tile track mechanisms so that the plate with attached work piece can be guided in a desired path relative to the router bit. The track mechanisms can be constructed to guide the plate in only the x and y directions or in a preferred embodiment tile track mechanisms can have a varying height in the z direction for actively varying the spacing between the router and the work piece as the plate is slidably guided by the track mechanisms during routing. In this manner, cuts can be made in the work piece which have a contoured depth.Type: GrantFiled: November 15, 1994Date of Patent: December 24, 1996Inventor: George G. Gaydos
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Patent number: 5556243Abstract: A neck down cutter for notching parallel sides in a rectangular sample of corrugated material to be subjected to edge crush testing is disclosed. The cutter comprises a suction box formed with a recessed surface in the top thereof through which a motor driven cylindrical cutting element projects for rotary movement about a vertical axis. The recessed surface defines a slide path for a sample holder formed with a recessed positioning slot which receives the side edges of the sample material being cut. The sample holder is movable between a non-working position (out of cutting contact) into a working or cutting position with the cutting element. A supporting notch in the sample holder is itself initially formed via contact with the cutting element to accurately register and support the notch formed in the specimen during subsequent cutting. A method of cutting notches in rectangular corrugated test specimens is also disclosed.Type: GrantFiled: September 23, 1994Date of Patent: September 17, 1996Assignee: Chesapeake CorporationInventor: William H. Bory
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Patent number: 5551494Abstract: A device for making patches, especially of wood, and for patching resin galls on pieces of wood, comprising a rotatably drivable milling tool, which is rotatably driveable by means of a first driving unit and is held on a supporting frame. Also disposed on the supporting frame is a clamping device, which is rotatable about a rotational axis. A remnant of the workpiece to be patched can be clamped in this clamping device and, by means of rotation about the rotational axis, can be led past the milling tool during which the lateral surface of the remnant is milled. Afterwards the clamping device can be lifted, the remnant being again led past the milling tool, the lateral surface being milled. Afterwards the patch made in this way can be detached.Type: GrantFiled: April 26, 1995Date of Patent: September 3, 1996Assignee: Lamello AGInventors: Wilfried Schneider, Dieter Steiner
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Patent number: 5431514Abstract: A method of processing a leading portion of a rotating workpiece is performed by rotating a tip mounted on a cutter shaft and facing an outer circumferential surface of the workpiece. The tip has a small radius of rotation for high precision processing with small cutting resistance. The leading portion is cut by the tip with the cutter shaft inclined to a side opposite to the leading portion of the workpiece with respect to a direction orthogonal to the axis of rotation of the workpiece.Type: GrantFiled: December 30, 1993Date of Patent: July 11, 1995Assignee: Canon Kabushiki KaishaInventors: Norihisa Saito, Masaichi Sato
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Patent number: 5381842Abstract: A protecting and guiding device for wood-shaping machines for shaping curved workpieces by means of a cutter (14) which is mounted on a spindle (12), projects vertically from a horizontal machine table (10), and is located underneath a covering hood (16) fastened to the machine table (10), a guide member (70) for the workpiece being held inside the covering hood (16). The covering hood has two side walls (18) connected with one another by a rear wall (20), a vertically adjustable front protective shield (28), and a top cover (22) provided with a connection piece (36) for a suction device. The two side walls (18) have smooth, plane inner surfaces (80) extending parallel to one another and are arranged so as to be horizontally displaceable independently from one another at the top cover (27) of the covering hood (16).Type: GrantFiled: June 16, 1993Date of Patent: January 17, 1995Inventor: Georg Aigner
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Patent number: 5207542Abstract: A fixture arrangement for supporting a plurality of different sizes of workpieces on a table relative to a metal working tool includes an equalizing device, a stop arrangement and a clamping device. The equalizing device positions the workpiece longitudinally on the table, the stop arrangement determines the longitudinal position of the workpiece on the table, and the clamping device secures the workpiece to the table. A guide arrangement guides movement of the equalizing device on the table along the transverse path and a latch device selectively maintains the equalizing device from guided transverse movement. The stop arrangement is connected to an elongated frame of the equalizing device, movable transversely with the equalizing device, and adjustable relative to the elongated frame in the transverse directions. The fixture arrangement is particularly suited for use on a metal working machine.Type: GrantFiled: August 30, 1991Date of Patent: May 4, 1993Assignee: Caterpillar Inc.Inventor: John B. Baldwin
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Patent number: 5002108Abstract: A process for the edge-planing of the longitudinal and frontal edges of workpiece plates. A workpiece plate is advanced to a plate saw and at least one longitudinal edge is planed. The workpiece plate is then rotated and at least one frontal edge is planed by the plate saw. The workpiece plate is then rotated, aligned, and advanced toward the plate saw for sectioning.Type: GrantFiled: September 28, 1989Date of Patent: March 26, 1991Inventor: Erwin Jenkner
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Patent number: 4787127Abstract: A combination woodworking machine for attachment to an electric plunge router, which may be configured as a horizontal boring and slot mortising machine, an overarm router and a router table. An x-y-z table is mounted on a column supported by feet, and a plunge router with its base removed is mounted in various orientations on the column by sliding it onto steel dowels mounted on the column. An electronic speed control reduces the router speed for boring, and an electronic digital readout provides accurate measurement of horizontal movement of the table.Type: GrantFiled: March 20, 1987Date of Patent: November 29, 1988Inventor: Jerrold R. Beall
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Patent number: 4742606Abstract: A cartridge case trimming device having mounted on a base a horizontally movable case carriage and case cutting device; the carriage includes cradle, trough, carriage groove, case retainer and toggle clamp; the cutting device includes an arbor head whose height is finely adjustable and an arbor shaft carrying at one end a combination chuck and cutter and on the other end a flexible coupling attached to a motor shaft.Type: GrantFiled: August 22, 1986Date of Patent: May 10, 1988Inventors: Owen Burby, Richard Clark
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Patent number: 4712954Abstract: A tube cutting device for making compound curve cuts on tubes providing angular abutment of tube ends on opposing tube surfaces. The cutting device positions and holds the tube in selected alignments in relation to a stationary cutting head and advances the tube into engagement with the cutting head.Type: GrantFiled: September 5, 1986Date of Patent: December 15, 1987Inventor: Dino Campolito
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Patent number: 4667548Abstract: An end preparation tool for pipe fittings includes an end preparation tool having a rotary cutting head with shaping bits carried thereon mounted on a base that also carries a universal clamping fixture for pipe fittings having end openings to be machined in preparation for welding. The clamping fixture includes workpiece engaging clamping pads that permit adjustment of the position of the workpiece relative to a pair of opposed clamping plates that normally secure the pipe fitting in place relative to the cutting head of the end preparation tool. The clamping fixture includes adjustment features that enable the fixture to be moved transversely relative to the cutting head, along the rotary axis of the cutting head and about a vertical axis that permits indexing of the clamping fixture relative to the tool cutting head.Type: GrantFiled: January 21, 1986Date of Patent: May 26, 1987Assignee: Tri Tool, Inc.Inventors: Henry Astle, Jerald VanderPol, Randall Schuster, Terry B. Linton
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Patent number: 4585217Abstract: Four square tooling plates each have an outer surface on which a plurality of workpieces are attached. The inner face of each tooling plate is precisely attached to a respective vertical surface of a rectangular block by means of a dowel extending into geometrically centered holes in the vertical face of the block and the tooling plate. Precise rotational alignment of the tooling plate with the block is achieved by a peg extending from the vertical face of the block into a timing hole in the tooling plate spaced from the center hole thereof. The block, with workpiece-loaded tooling plates thereon, is lowered onto a rotary table so that a geometric axis of the block is perfectly aligned with the rotational axis of the rotary table. Rotational alignment of the block with the rotary table is achieved by mating of keys extending from the bottom of a base plate of the block into keyways in the surface of the rotary table.Type: GrantFiled: September 20, 1983Date of Patent: April 29, 1986Inventor: Robert W. Erickson
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Patent number: 4576212Abstract: A device in a machine tool for maintaining a workpiece which is being worked during displacement in the longitudinal direction, in engagement with the tool. The device consists of a first pair of rigidly interconnected arms which, at one end, are pivotally connected to first ends of a second pair of rigidly interconnected arms and, at the other end, are pivotally mounted on the machine frame. The other ends of the arms of the second pair are pivotally mounted on a pressure plate, all pivot shafts of the arms extending parallel to the direction of movement of the workpiece. Above the arm arrangement, a shaft extending in parallel with the working plane of the machine and perpendicularly to the direction of movement of the workpiece is vertically adjustably fixed on the machine frame. A piston and cylinder assembly is adjustably mounted on said shaft.Type: GrantFiled: March 9, 1984Date of Patent: March 18, 1986Assignee: Waco Jonserreds ABInventor: Bengt Andersson
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Patent number: 4556094Abstract: A fence for a radial arm saw used as a dado cutter or molding cutter with the cutting head in a horizontal orientation is disclosed. The fence provides a work surface perpendicular to the saw table surface and includes two fence panels having a thickened lower area for being clamped in the fence slot of the saw table and an adjustable gate panel positioned between the fence panels. An aperture is formed in the gate panel for admitting a work-performing portion of the cutting head. The gate panel is capable of accommodating the various heights of the cutting head by moving between a lower position where the aperture is adjacent to the surface of the saw table and upper position where the aperture is above the table surface. The gate is appropriately secured with the aperture in the desired position for the height of the cutting head. The thickened areas of the fence panels provide clearance for the gate panel to move into the fence slot so that the aperture may be positioned adjacent to the saw table.Type: GrantFiled: July 3, 1984Date of Patent: December 3, 1985Inventor: Calvin B. Willocks
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Patent number: 4541760Abstract: A multipurpose apparatus for drilling, engraving and carving ophthalmic lenses. The apparatus comprises a base in which is mounted an electrical motor, and a tool holder is connected to the shaft of the motor for detachably mounting a drilling, engraving or carving end mill above the upper surface of the base. A working support is also mounted on the upper surface of the base for maintaining and supporting the lenses in the various positions in which they must stand in order to be easily drilled, engraved or carved. The working support comprises a platform detachably mounted onto the upper surface of the base, and a guide holder rigidly mounted onto the platform in parallel relationship with respect to the tool holder. The support also comprises a L-shaped tube having one end fitted into a central hole provided in the platform for giving room to the tool holder, and the other end connected to the guide holder.Type: GrantFiled: July 23, 1984Date of Patent: September 17, 1985Inventor: Georges Zoueki
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Patent number: 4454689Abstract: In a grinding or milling machine an improved clamping arrangement for holding one end of a tool blank having a portion with at least four sides in cross-section. The other end of the tool blank is held against a stationary holding member. The clamping arrangement includes a housing which is coaxially mounted on a drive shaft. A pair of clamping members are reciprocally mounted in the housing and are biased outwardly by means of a pair of coil springs. Each clamping member has a skewed planar surface at its free end. The skewed planar surfaces biasingly engage opposite edges of the tool blank so as to compensate for any misalignment of the tool blank with respect to the holding member and clamping arrangement.Type: GrantFiled: September 9, 1981Date of Patent: June 19, 1984Assignee: ITM International Tool Machines, Inc.Inventor: Karl-Heinz Giebmanns
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Patent number: 4376603Abstract: Apparatus for removing shop or screw machine part or workpiece. More specifically, the apparatus comprises a bushing with a hole therein for axially guiding the burred end of the part into engagement with a disintegrating mechanism such as a saw, grinder or abrader, in combination with a stop for arresting both the inward movement of the part and the resulting disintegration when the burr becomes disintegrated flush with said flat end.Type: GrantFiled: September 22, 1980Date of Patent: March 15, 1983Assignee: A. B. Carter, Inc.Inventor: Herbert E. Hudgins
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Patent number: 4304276Abstract: A router for edging laminated plastics, such as Formica material, includes a table and an adjustable work guide assembly. The work guide assembly comprises a stationary guide and a movable guide. The movable guide is movable toward and away from the stationary guide to determine the extent of the cut to be made by the router bit. A further stationary guide is also provided which is mounted on the table parallel to the previously mentioned guides, whereby a second edge may be cut on the laminated plastic which is parallel to the first edge. Also, movable carrier guide means are provided to cut further edges transverse to the first two edges.Type: GrantFiled: September 24, 1980Date of Patent: December 8, 1981Inventor: Armando Termini
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Patent number: 4289305Abstract: For use with a spindle molder or similar milling machine, there is provided a holder in which a plurality of work pieces can be mounted for movement in unison of each into engagement with the cutting tool by actuation of the holder. Provision is also made for contact with a power feeder so that the work piece holder can be power-driven across the table.Type: GrantFiled: December 14, 1979Date of Patent: September 15, 1981Inventor: Gary W. Penner
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Patent number: 4182589Abstract: A chamfering apparatus for use in machining corner breaks of work pieces and including a base member establishing a horizontal support surface, a guide block mounted on the base member and forming a guide surface substantially normal to the horizontal support surface such that a trim slot is formed about he intersection of the plane of the horizontal support surface and the plane of the frontal vertical guide surface; a circular cutting member having an axis of rotation parallel with the axis of the trim slot positioned about the base member with the outer peripheral edge of the cutting member extending within the trim slot such that the edge of a work piece may be chamfered as it is moved along the trim slot while in abutting relationship to the horizontal support surface and frontal vertical guide surface.Type: GrantFiled: July 17, 1978Date of Patent: January 8, 1980Inventors: Robert H. Boudreault, Mark A. Boudreault, Brenda L. Boudreault
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Patent number: RE38612Abstract: A router table fence having three nesting aluminum extrusions or spars, two of which lie under a longer third spar. By positioning the inner ends of the two lower spars adjacent to a router cutter protruding through a router table, it is possible to provide a fence, particularly when the lower spars are used with wood facings or sub-fences, that can be adjusted to closely surround the cutter. Lateral movement of the fence assembly adjusts the amount of cutter that contacts a workpiece manipulated past the cutter while contacting the fence. The cross sectional shapes of the spars are identical and are generally square, with structure that permits the upper, longer spar to rest on top of, and be attached in a manner permitting it to slide against, the lower two spars. T-shaped slots in each face of the spars accept fasteners that connect the spars together and also accept fasteners for a variety of accessories, such as hold-down devices and shields.Type: GrantFiled: February 28, 2002Date of Patent: October 5, 2004Assignee: Lee Valley Tools, Ltd.Inventors: Edwin C. Tucker, Michael S. McGuire, Leonard G. Lee, John S. Lynn