Patents Assigned to Sheffer Collet Company
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Patent number: 5143687Abstract: Each of the jaws of a sliding jaw chuck are moved between workpiece clamping and release positions by a post, the end of which, in active position, is seated in an opening in an octogonal plate seated in a recess in the jaw. The plate is octagonal and its dimensions are such that it always entirely occupies the recess in the direction of movement of the jaw. In contrast, the recess is wider than the plate, permitting the plate, after removal from the recess, to be rotated about the post to any one of five positions. While the plate is symmetrical about its geometric center, the opening for the post is offset from the plates's center which results in changes in the spacing between the post and the ends of the recess, which controls the radial position of the jaw with respect to the axis of rotation of the chuck and thus the size of the workpiece which it can clamp.Type: GrantFiled: February 7, 1991Date of Patent: September 1, 1992Assignee: Sheffer Collet CompanyInventors: Carl J. Howard, Donald J. Wrobel
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Patent number: 5105523Abstract: A chuck support base for very accurate machining of parts includes a pair of interengaging members through which rotary motion is delivered to a tool holding chuck. The member on which the chuck is mounted has a ring with an internal frusto-conical exterior surface of a drive member mounted on the chuck support base of a machine tool. Both the ring and the driver member are secured to their supporting members by a bonding agent which initially is liquid and hardens while the structure to which it is attached is rigidly supported in a jig so that any variation from total concentricity with the axis of rotation of the tool is eliminated by compensating the positioning of the two rings before the bonding agent sets.Type: GrantFiled: May 29, 1991Date of Patent: April 21, 1992Assignee: Sheffer Collet CompanyInventor: Carl J. Howard
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Patent number: 5052700Abstract: A chuck is disclosed which has article gripping member each having a pivot portion intermediate its ends about which the member pivots as the chuck is opened and closed. The members are each caused to pivot by a pin which passes through a slot in the member adjacent the inner end of the member remote from the workpiece gripping outer end thereof. Movement of the pin lengthwise of slot causes the member to pivot. The slot in which the pin is seated is elongated lengthwise of the member and is inclined to the central axis of the member at a very minor angle whereby the centrifugal forces generated by operation of the chuck cannot generate sufficient force to cause the pin to move lengthwise of the seat and thus permit the jaw to release the workpiece.Type: GrantFiled: June 4, 1990Date of Patent: October 1, 1991Assignee: Sheffer Collet CompanyInventors: Carl J. Howard, Donald J. Wrobel
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Patent number: 4688810Abstract: A system for holding workpieces during machining providing a plate to which the workpiece can be rigidly secured. The plate, on its rear face, has a central frusto-conical boss which seats into a complementary central recess in a support member. The support member has plural, radially reciprocal latch members which engage pockets in the boss. A ring rotatably mounted on and surrounding the support member is operatively connected to the latch members for simultaneously extending and retracting them.Type: GrantFiled: April 15, 1986Date of Patent: August 25, 1987Assignee: Sheffer Collet CompanyInventor: Carlson A. Waite
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Patent number: 4662043Abstract: A system for positioning and holding workpieces for successive machining at several work stations or machining by several machines at a multi-tool cell incorporating a workpiece holding and transporting project plate and a self-centering support chuck at every machine for holding and automatically positioning the project plate and its workpiece with a repeatably high degree of accuracy using the axial centerline of the support chuck as the reference of concentricity by which the tool and workpiece are addressed to each other.Type: GrantFiled: January 10, 1985Date of Patent: May 5, 1987Assignee: Sheffer Collet CompanyInventors: William S. Stone, Thomas M. Dittrich
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Patent number: 4647051Abstract: A system for holding workpieces during machining utilizes a support chuck which may be mounted on a machine tool such as a lathe or it may be mounted on a support adjacent the machine tool such as a turnaround or carrousel. The invention utilized an adapter plate constructed to be gripped by the support chuck. The adapter plate in turn mounts the chuck which actually holds the workpiece. The support chuck has means to clamp the adapter plate to it and to precisely center the plate and its workpiece gripping chuck concentrically of the support chuck. The adapter plate is so constructed that the chuck manipulation rods and pulls conventionally used with chucks or various types can pass through it to actuate the workpiece holding chuck.Type: GrantFiled: May 3, 1985Date of Patent: March 3, 1987Assignee: Sheffer Collet CompanyInventors: William S. Stone, Thomas M. Dittrich
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Patent number: 4591171Abstract: Means are provided to introduce pressurized fluid from a source into an intermittently rotated machine tool such as a chuck while the tool is stationary. The means includes a stationary annular shell surrounding a portion of the tool and radially spaced a short distance from the surface of the tool. The inside of the shell has a channel which seats an annular flexible U-shaped seal the radially outer ends of the legs of which are rigidly secured to the shell. The inner face of the seal is a web having a relatively stiff center band which, under fluid pressure is forced to shift into contact with the surface of the tool to form a seal on each side of a groove in the tool's surface. A restricted opening permits fluid from the inside of the seal to be introduced into the groove to supply the tool.Type: GrantFiled: March 2, 1984Date of Patent: May 27, 1986Assignee: Sheffer Collet CompanyInventor: William Stone
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Patent number: 4422653Abstract: A chuck is provided with a cylindrical workpiece gripping element having a jacket and an article gripping member and a resilient rubber-like sleeve sandwiched between. The jacket and gripping member are partially segmented into longitudinal strips so that the element as a whole can be diametrically expanded and contracted and when used to grip a workpiece having an eccentric surface the element will automatically adjust to apply equal pressure at all points on the workpiece surface and thus not distort the workpiece. The element is expanded and contracted by movable jaws.Type: GrantFiled: April 16, 1982Date of Patent: December 27, 1983Assignee: Sheffer Collet CompanyInventor: Charles Piotrowski
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Patent number: 4422655Abstract: A chuck for heavy duty applications has a plurality of radially slidable jaw mounts each actuated by an L-shaped lever mounted for rocking motion about a supporting trunnion. The levers each have a leg engaging one of the jaw mounts and another engaging an actuator. An external lubricant receiving port is provided adjacent each trunnion and a multiple conduit lubricant distribution system is provided extending through the supporting trunnion and actuating lever. The chuck body also has a lubricant flow channel through which lubricant flows circumferentially of the chuck to assure uniform distribution, eliminating lubricant concentrations and eccentric weight distribution in the chuck.Type: GrantFiled: August 24, 1981Date of Patent: December 27, 1983Assignee: Sheffer Collet CompanyInventor: Carlson A. Waite
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Patent number: 4355816Abstract: A chuck is disclosed for gripping an annular workpiece by jaws clamping against the inside wall of the workpiece. The jaws extend axially of the chuck and are rocked between clamping and release positions by levers which contact the radially outer face of the rearward end of the jaws as a result of pivoting about a point adjacent the radial outer periphery of the chuck body. The levers are moved by an axially movable actuator at the axial center of the chuck. The arrangement provides a mechanical advantage such that the chuck in closed position is substantially self locking.Type: GrantFiled: June 30, 1980Date of Patent: October 26, 1982Assignee: Sheffer Collet CompanyInventor: Jay D. Beery
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Patent number: 4236722Abstract: A chuck for a machine tool is disclosed having radially rockable work clamping jaws. These jaws are rocked between work clamping and work releasing positions by radially extending levers engaging axially and rearwardly extending legs on the rockable supports for the jaws. The levers form a toggle-like mechanical lock with the legs of the rockable supports which lock will not permit the jaws to release even though the lever actuating mechanism is not subjected to any restraining force. Further, the disclosure provides a mechanism which is not biased to release by the centrifugal forces incident to the use of the chuck.Type: GrantFiled: May 16, 1979Date of Patent: December 2, 1980Assignee: Sheffer Collet CompanyInventor: Merle Felker
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Patent number: 4206932Abstract: A diaphragm type chuck is disclosed equipped with means to lock the work engaging jaws against inadvertent release due to centrifugal forces. The means automatically shifts into jaw locking position when the chuck is closed and automatically releases the jaws when the chuck is to be opened.Type: GrantFiled: February 28, 1979Date of Patent: June 10, 1980Assignee: Sheffer Collet CompanyInventor: Merle Felker
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Patent number: 4094521Abstract: A collet chuck includes a body having a spindle adapter secured to one end and a collet retaining ring at the opposite end for holding a collet in place in the chuck. Stationary slip ring and piston assemblies are mounted to the rotatable body by bearings and include a hydraulically operated piston movable axially to engage an actuator having a camming surface engaging the collet. A plurality of springs extend between the body and the axially movable actuator for providing clamping pressure to the collet. The hydraulic piston operates in opposition to the springs for releasing the clamping pressure on the collet.Type: GrantFiled: January 21, 1977Date of Patent: June 13, 1978Assignee: Sheffer Collet CompanyInventor: Charles Piotrowski