By Deforming Resilient Tool Or Tool Support Patents (Class 83/542)
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Patent number: 11981045Abstract: The present invention relates to an advance shaft transition apparatus for sheet processing equipment, which comprising: a plurality of advance shafts for feeding foils, the plurality of advance shafts being arranged along a horizontal direction; an advance shaft supporting frame, the advance shaft supporting frame supporting the ends of the advance shafts so that the advance shafts can freely rotate; and a lifting means, the lifting means is provided with a driving means and a transmission mechanism, the lifting means is connected to the advance shaft supporting frame to enable the advance shafts to move between a first position and a second position, at the first position, the advance shafts is operably rotated to feed the foil, and at the second position, the advance shafts being lifted up from the first position to leave a position where the foil can be fed.Type: GrantFiled: March 4, 2019Date of Patent: May 14, 2024Assignee: Bobst (Shanghai) LtdInventors: Jean-Claude Rebeaud, Peicong Qi, Haoming Song
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Patent number: 9925952Abstract: A cutting mechanism (30) for a safety belt (10), the cutting mechanism (30) including a case (32), a passage (34) running through the case and making it possible to mount the cutting mechanism (30) on the belt (10) to be cut, and cutting elements (42) for the seatbelt (10), situated inside the case, the cutting elements (42) include a wire (44) and elements for heating (46) the wire. A process for cutting a safety belt (10), includes using a wire (44) and elements for heating (46) the wire in order to cut the belt with the heated wire.Type: GrantFiled: July 31, 2014Date of Patent: March 27, 2018Assignee: AGUILA TECHNOLOGIEInventors: Matthias Flegar, Laurent Dardinier
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Publication number: 20140109471Abstract: A plant graft production line for automatically grafting a rootstock and a scion si disclosed. The aforesaid plant graft production line comprises (a) a closed-loop conveyor; (b) at least one grafting assembly arranged for transporting along said conveyor; the assembly further comprises a rootstock holder for holding the rootstock and a scion holder for holding the scion; the holders arranged for at least partially superimposing said rootstock and scion; (c) stationary cutting mechanism for cutting exposed rootstock surface; (d) a stationary cutting mechanism for cutting a exposed scion surface to be; (e) stationary clipping mechanism for clipping the superimposed rootstock and scion together. It is a core feature of the invention to provide the rootstock holder arranged so as to provide a curvilinear plane along which said rootstock is conformed thereby presenting a curved cutting target for the cutting mechanism.Type: ApplicationFiled: May 3, 2012Publication date: April 24, 2014Applicant: HISHTIL LTDInventor: Ofir Luk
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Patent number: 8499674Abstract: An accessory tool is configured to be coupled to a power tool having a tool drive structure. The accessory tool includes a spring component and has a first arm and a second arm attached to the spring component. The first arm includes (i) a first proximal end portion defining a first accessory drive structure that is configured to mate with a first portion of the tool drive structure, and (ii) a first distal end portion having a first holding structure. The second arm is spaced apart from the first arm and includes (i) a second proximal end portion defining a second accessory drive structure that is configured to mate with a second portion of the tool drive structure, and (ii) a second distal end portion having a second holding structure.Type: GrantFiled: September 22, 2010Date of Patent: August 6, 2013Assignee: Robert Bosch GmbHInventors: John Holba, Edward Abante, Jeremy Rubens, Carl Christian Carlson, Jaime Moreno
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Publication number: 20130125718Abstract: A cutting device for cutting an optical fiber running in a first direction is comprised of a supporting piece having a free end and a fixed end and having resilience; a cutting blade supported by the supporting piece and so disposed as to come in contact with the optical fiber to make a right angle with the optical fiber at a point of the contact; and a driving device configured to press the supporting piece in a second direction in a plane perpendicular to the first direction, the second direction being not intersecting with the first direction.Type: ApplicationFiled: January 15, 2013Publication date: May 23, 2013Applicant: FUJIKURA LTD.Inventor: FUJIKURA LTD.
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Publication number: 20110283848Abstract: A device for trimming the thickness of a mechanical body is disclosed. The trimming is performed by screwing a screw through a threaded hole and having the end of the screw pressing against the center of a disk element, which, by deformation, acts as a lever against an adjacent body.Type: ApplicationFiled: May 12, 2011Publication date: November 24, 2011Applicant: MINDRAY MEDICAL SWEDEN ABInventor: Göran Cewers
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Patent number: 7918630Abstract: A material cutting machine has a tool mount support mounted for reciprocal movement and a tool mount supported by the tool mount support. A driver, such as a pneumatic cylinder, selectively advances and retracts the tool mount support. A control system is operatively coupled to the driver for setting the advancement force of the tool mount support when a tool supported by said tool mount contacts a workpiece, such as the edge or surface of a moving strip. In this way, the depth of cut of the tool is controlled by tool advancement force rather than by accurate positioning of the tool. In one embodiment, the tool mount support may have a head and a base and a resilient member resiliently coupling the head to the base to provide a damped resilience. With this embodiment, a transient spike in the reaction force which may result, for example, from a hard spot in the material, causes the tool to momentarily deflect.Type: GrantFiled: August 15, 2007Date of Patent: April 5, 2011Inventor: Austen B. Barnes
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Publication number: 20090308217Abstract: A cutting apparatus includes a base frame, a pair of holder assemblies, an overhead frame, a cutter assembly and a controller. The pair of holder assemblies are operably connected to the base frame with one holder assembly holding the first workpiece and the other holding the second workpiece. The pair of holder assemblies independently move relative to one another along a transverse axis. The overhead frame is connected to the base frame. The cutter assembly is connected to the overhead frame and moves along a vertical axis and a horizontal axis. The cutter assembly includes a rotary cutter mechanism with a rotating cutting tool. The controller controls and moves of the pair of holders and the cutter assembly so that the rotating cutting tool cuts the first workpiece in a first desired configuration then moves to the second workpiece to cut the second workpiece in a second desired configuration.Type: ApplicationFiled: June 17, 2008Publication date: December 17, 2009Applicants: Sony Corporation, Sony Electronics, Inc.Inventor: Esteban A. Alvarez Serrano
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Publication number: 20080236356Abstract: A punching device comprises a pushing pole, an adjusting portion, a supporting portion, and a spring. The pushing pole comprises a first threaded end and a second threaded end. The adjusting portion defines a screw hole therein, through which the adjusting portion is fixed to the first end of the pushing pole. The supporting portion is located on the pushing pole, with the pushing pole passing through a through hole in the supporting portion. The spring is disposed around the pushing pole, with two ends respectively abutting against the adjusting portion and the supporting portion.Type: ApplicationFiled: April 2, 2008Publication date: October 2, 2008Applicants: HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., HON HAI PRECISION INDUSTRY CO., LTD.Inventors: KUO-JUNG HUANG, SHU-WEI ZHOU, FU-SHUN HUANG, CHUN-NAN OU, CHIA-HSIANG OU, YUN-FENG ZHANG
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Patent number: 6871572Abstract: A drive device for generating oscillations, especially for the blade of a microtome, with a power generator and a power transmission element, which with the power generator is movable in a predetermined oscillation direction (S), whereby the power generator includes a combination of a permanent magnet part and a coil part, whereof one part is fixed stationary on a holder and the other part on the power transmission element, respectively, and the power transmission element is formed by a vibrational arm, which is fixed at one end to the holder and which is elastically bendable in the oscillation direction and still in all other directions.Type: GrantFiled: October 23, 2000Date of Patent: March 29, 2005Assignee: Max-Planck-Geselleschaft zur Forderung der WissenschaftenInventors: Bernhard Häussler, Rolf Rödel, Josef Pauli
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Patent number: 6722247Abstract: A device for suspending one end of a saw blade (28) in a first arm (14) of a parallelogram-jigsaw, having a second arm (18) parallel to the first arm and having a a saw blade clamp (38) mounted pivotably with respect to the first arm (14). A third arm (36) is provided parallel to the first arm (14) as positive guide and pivotably mounted, of which the length can be slightly extended or reduced in the longitudinal direction under load. The saw blade clamp (38) is mounted pivotably on the ends of the respective first arm (14) and third arm (36) which ends are opposite the rotation axis (12, 43).Type: GrantFiled: November 7, 2001Date of Patent: April 20, 2004Inventor: Helmut Abel
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Publication number: 20020073822Abstract: A device for suspending one end of a saw blade (28) in a first arm (14) of a parallelogram-jigsaw, having a second arm (18) parallel to the first arm and having a a saw blade clamp (38) mounted pivotably with respect to the first arm (14). A third arm (36) is provided parallel to the first arm (14) as positive guide and pivotably mounted, of which the length can be slightly extended or reduced in the longitudinal direction under load. The saw blade clamp (38) is mounted pivotably on the ends of the respective first arm (14) and third arm (36) which ends are opposite the rotation axis (12, 43).Type: ApplicationFiled: November 7, 2001Publication date: June 20, 2002Inventor: Helmut Abel
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Patent number: 6305634Abstract: A track and flap assembly employs an elongate compressible foam member completely covering an elongate channel that carries a paper cutting tape. Between the bottom of the foam member and the top of the channel are one or two pivotally mounted resilient flap members that cooperate with the foam member to provide a desired frictional drag and exiting resistance to control the cutting tape movement during turn up. A compressed air passage is provided to allow for forced air removal of debris and other contaminants from the tape channel. The assembly is constructed in two configurations to accommodate different papermaking apparatus.Type: GrantFiled: October 20, 1999Date of Patent: October 23, 2001Assignee: Sandar Industries, Inc.Inventor: Peter A. Rodriguez
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Patent number: 5918516Abstract: A method of cutting input/output columns on an electronic component includes the steps of: providing a shear plate which has a thickness that is less than the length of the columns and which has respective holes for receiving all of the columns; inserting the columns into the holes until a portion of the columns extend past the shear plate; placing a blade, with a cutting edge, at an acute angle against the shear plate such that only the cutting edge of the blade touches the shear plate; and, sliding the cutting edge of the blade against shear plate and through the portion of the columns which extend past the shear plate, while keeping the blade at the acute angle. With this method, crater-like voids and burrs on the cut ends of the columns are eliminated.Type: GrantFiled: February 7, 1997Date of Patent: July 6, 1999Assignee: Unisys CorporationInventors: Ronald Allen Norell, Kenneth Walter Economy
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Patent number: 5809858Abstract: There is disclosed herein a device for achieving and maintaining the optimum positioning of the cutting die and platen components on a die cutting machine used for cutting and scoring paper, plastic, leather, cloth, metal, and other like materials. The device compensates for inherent deviations present in each individual die cutting machine. The invention is comprised of a rigid lightweight metal substructure bonded to an overlayment of a semi-rigid material possessing a unique combination of elastic and compressible properties which allow the cutting knives in a steel rule die to lie in the same horizontal plane as the movable platen.Type: GrantFiled: December 4, 1996Date of Patent: September 22, 1998Inventor: Paul Wesley DeRoo, Sr.
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Patent number: 5456587Abstract: A plastic pellet delivery system including an extruder nozzle having an orifice and an arcuate surface adjacent the orifice and rigid cutting knife which is eccentrically mounted on a shaft that is positioned and is rotated adjacent the orifice to move the rigid knife eccentrically into and out of engagement with the nozzle surface. The cutting knife is mounted for limited yielding pivotal movement relative to the eccentric mount such that it will deflect angularly with respect to the eccentric mount as it is engaging the nozzle surface such that the free edge of the knife blade tip is moved radially inwardly as the eccentric mount is rotated providing a substantially constant force of the blade against the nozzle surface.Type: GrantFiled: October 31, 1994Date of Patent: October 10, 1995Assignee: Owens-Illinois Closure Inc.Inventor: Keith W. Ingram
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Patent number: 5386971Abstract: A plastic pellet delivery system including an extruder nozzle having an orifice and an arcuate surface adjacent the orifice and rigid cutting knife which is eccentrically mounted on a shaft that is positioned and is rotated adjacent the orifice to move the rigid knife eccentrically into and out of engagement with the nozzle surface. The cutting knife is mounted for limited yielding pivotal movement relative to the eccentric mount such that it will deflect angularly with respect to the eccentric mount as it is engaging the nozzle surface such that the free edge of the knife blade tip is moved radially inwardly as the eccentric mount is rotated providing a substantially constant force of the blade against the nozzle surface.Type: GrantFiled: July 22, 1993Date of Patent: February 7, 1995Assignee: Owens-Illinois Closure Inc.Inventor: Keith W. Ingram
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Patent number: 5010795Abstract: A sheet material cutter for shearing various widths of sheet material such as aluminum or plastic siding, soffit, facia board and flashing is provided which is readily transportable and useful in cutting a variety of widths of such sheeting. The cutter has a base, a shearing blade of a length greater than the maximum width of sheet to be cut, spaced apart shearing dies mounted on the base and defining a shearing slot through which the blade travels when shearing a width of material, and a post on the base to which the shearing blade is pivotally mounted. The shearing blade includes a pointed section which pierces the sheet material, first the remaining shearing edges of the blade shearing the material to each side of the pierced area to complete cutting of the sheet material.Type: GrantFiled: December 1, 1986Date of Patent: April 30, 1991Inventor: Jozef Kania
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Patent number: 4862779Abstract: A cutter of the present invention comprises a punching member having a punching edge and a receiving member for receiving the punching force of the punching member, the receiving member having a sandwich structure comprising two plate materials and an elastic body held therebetween. Therefore, the receiving member is capable of elastically holding the punching edge during punching.Type: GrantFiled: May 18, 1988Date of Patent: September 5, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Mizuho Nishimura, Nobuo Watase, Yasunobu Sakaguchi, Mikio Kogane
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Patent number: 4856399Abstract: In an apparatus for blanking out a sheet material (1) between a punch (4) and a die (6) having a sharp edge (7), the punch (4) is formed by a heterogeneous composite elastic material having localized regions (4a) having a relatively higher hardness, and complementary regions (4b) having a relatively lower hardness.Type: GrantFiled: May 17, 1988Date of Patent: August 15, 1989Assignee: IsoformInventor: Gabriel Deshet
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Patent number: 4827820Abstract: A paper web cut-off device, comprising a frame and a blade member mounted on the frame. The blade member is disposed to execute cutting of the paper web, with an actuator being provided for producing, on the blade member, the force required for cutting the paper web. The actuator for producing the required force for cutting of the paper web, is a spring member in which cutting energy is stored. At least one cocking or loading member is provided, which is disposed to cock or load the spring member.Type: GrantFiled: February 24, 1987Date of Patent: May 9, 1989Assignee: Oy Wartsila ABInventor: Jorma Kinnunen
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Patent number: 4783982Abstract: A system for trimming a can body wherein a can body is positioned within a cutting member so that the cutting member is at the location where the can body is to be trimmed. A resilient, deformable object is inserted into the can body and positioned therein so that at least a portion thereof is located radially opposite portions of the can body on each side of the cutting member. The resilient, deformable object is deformed so as to move a first part thereof against a portion of the can body to prevent longitudinal movement of the can body and then to move a second part thereof against the portion of the can body located between the cutting member and the open end of the can body in a radially outward direction so as to sever that portion from the can body.Type: GrantFiled: September 29, 1987Date of Patent: November 15, 1988Assignee: Adolph Coors CompanyInventors: Roger A. Hahn, Robert H. Schultz
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Patent number: 4723466Abstract: A self-sharpening hole punch for plastic bags includes a pneumatically operated punching apparatus for punching wicket pin receiving holes in a flexible film or plastic bag. If desired, a tear slit may be simultaneously formed to enable the bag to be quickly and readily torn free from the wicket pin upon which the bag is retained. A pneumatic air cylinder has a cylinder rod with a fitting affixed thereto, the fitting having an internal tapered thread. Interchangeable plastic cutting tools, having a complementary tapered thread, may be interchangeably screwed into the fitting to facilitate replacement as necessary. A resiliently compressible cylinder of foam plastic material is disposed in a circular void at the cutting side of each of the plastic cutting tools to expel the waste film discs that are punched out of the film or plastic bag material.Type: GrantFiled: February 10, 1986Date of Patent: February 9, 1988Inventor: Earl T. Pottorff
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Patent number: 4656904Abstract: A cutter apparatus is disclosed for cutting elongated food products such as french fry potato strips, to cut them in two or to remove defects. The cutter apparatus includes two independently operated knives which are actuated by pneumatic cylinders controlled by solenoid valves that apply air pulses to such cylinders for fast operation. The valves are operated in response to control signals produced by light sensor means which senses the defect and causes a central processing unit of a computer to produce the control signals. The knife blades are each connected to the piston rod of the cylinder by a flexible resilient connector for causing the blade to move in a non-linear manner downward in response to linear movement of the piston rod for cutting the defect from the food product while such product is moving along a conveyor belt beneath such cutter, without arresting movement of the food product.Type: GrantFiled: September 4, 1985Date of Patent: April 14, 1987Assignee: Lamb-Weston, Inc.Inventors: Arthur G. Rayment, Herbert W. Johanson, Jr.
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Patent number: 4653372Abstract: A self-sharpening hole punch for plastic bags includes a pneumatically operated punching apparatus for punching wicket pin receiving holes in a flexible film or plastic bag. If desired, a tear slit may be simultaneously formed to enable the bag to be quickly and readily torn free from the wicket pin upon which the bag is retained. The disclosed embodiment utilizes a pneumatic air cylinder having a free end of the cylinder rod having a fitting secured thereto having an internal tapered bore. Interchangeable plastic cutting tools, having a complementary tapered thread, may be interchangeably threaded into the fitting to facilitate replacement as necessary.Type: GrantFiled: June 26, 1985Date of Patent: March 31, 1987Inventor: Earl T. Pottorff
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Patent number: 4624164Abstract: A hydraulic shearing machine for cutting steel sheets and the like in which the lower blade is fixed between two vertical end-plates of the frame while the upper blade is carried by a movable apron. The support provided for the lower cutting blade consists of a hollow box which extends horizontally between the vertical end-plates of the shearing-machine frame and only the ends of which are attached to the frame. The lower blade is fixed against one of the side walls of the support box so as to be displaced with respect to the theoretical center of rotation of said support box about its own axis. In consequence, the vertical forces exerted on the lower blade at the time of utilization of the shearing machine tend to produce a twisting movement of the support box, thus providing compensation for the horizontal flexural displacement of the box under the action of the horizontal forces.Type: GrantFiled: April 26, 1985Date of Patent: November 25, 1986Assignee: Promecam Sisson-LehmannInventor: Rene Passa
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Patent number: 4366737Abstract: A cutting head for a filter attachment machine comprises a carrier drum carrying at circumferentially spaced positions a number of knife bodies each of which is clamped onto the drum by retaining devices engaging the ends of the knife body, and including an interposed layer of rubber or other resilient material lying at least in the region below the middle of the knife body, each knife body, its retaining devices and its rubber layer being so arranged that when the knife body is secured in position by the retaining devices, it is flexed slightly so that its cutting edge is slightly convex.Type: GrantFiled: October 28, 1980Date of Patent: January 4, 1983Assignee: Molins LimitedInventor: Michael J. Bedford
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Patent number: 4281571Abstract: A paper cutter assembly for use in combination with a supported roll of paper. The assembly, comprises a displaceable stationary single-strand cutter wire member that is positioned under and across the width of the paper roll, and a movable paper-cutting assisting subassembly that includes a pulley member disposed on the cutter wire member, and a handle member that is removably connected to the pulley member. When the pulley member is pulled by the operator toward himself and across the width of the unrolled paper with the use of the handle member, the cutter wire member is displaced toward the operator, the unrolled paper is cut in a straight and clean condition across its width, and is severed from the rest of the roll of paper in a quick and safe manner by the movement of the displaced wire member.Type: GrantFiled: August 22, 1979Date of Patent: August 4, 1981Inventor: Rowland K. Yates
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Patent number: 4232576Abstract: A device for severing a continuous rod-like member into separate elements during axial movement along a predetermined path through a severance zone comprising a ledger for engaging and maintaining said member in said path during its passage though said zone, means for causing a cutting knife to move along an endless course substantially at right angles to said path, and said course intersecting transversely with said path to sever the member and means for causing the knife to move at a greater speed while it is travelling across said path than in other parts of its movement.Type: GrantFiled: December 26, 1978Date of Patent: November 11, 1980Assignee: The Wiggins Teape Group LimitedInventor: Roger A. Allen
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Patent number: 4143568Abstract: Web cutting apparatus employs a rotary knife cylinder with elongated, radially outwardly projecting knife blade assemblies spaced around its periphery. A rotary anvil cylinder spaced parallel to the knife cylinder carries a corresponding peripheral array of elongated anvils. When the two cylinders rotate, the knife blades bear against the anvils at the nip between the two cylinders. The knife blade assemblies are flexible and resilient so that each blade edge is biased against its anvil at the instant of interference, with a local force sufficient to cut web. Further, the natural frequency of the knife assemblies is selected to be considerably higher than those of the other machine parts so that the spacing between the knife blades and the anvils at the nip is substantially unaffected by vibrations of those parts. Also the apparatus efficiently removes trim strips produced by the web cuts.Type: GrantFiled: June 30, 1977Date of Patent: March 13, 1979Assignee: Butler-Automatic, Inc.Inventor: John Cogswell
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Patent number: 4119047Abstract: A cutter mechanism for use in a tufting machine or the like featuring a stationary blade having openings through which yarn strands project, the stationary blade being positioned in the path of travel of yarn strands from yarn creels to bit-applying elements with the cutter mechanism further featuring a series of reciprocable blades which are biased against the stationary blade whereupon reciprocation the reciprocable blades will pass over the openings and because of their biasing effect, penetrate the plane of the stationary blade passing into the openings thereby severing the yarn strands.Type: GrantFiled: June 30, 1977Date of Patent: October 10, 1978Assignee: Abram N. SpanlInventors: Abram N. Spanel, P. Frank Eiland, David R. Jacobs, David N. Buell
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Patent number: 4111089Abstract: The dispenser comprises a generally cylindrical or cup-like base member which removably receives a spool of a dispensable and cuttable plastic-coated ribbon or wire which is wound on the spool. The side wall of the base has an opening through which the wire or tape can be fed from the spool. Each spool can be replaced in the base member as it is used up, or a new spool can be inserted at any time, if desired. A disk-like cover member, carrying a central post, forms a tight mechanical fit with the base, with the post engaging the spool, whereby the spool is held in place and can rotate thereon. The base carries an extension plate which carries a cutting mechanism which is generally aligned with the opening in the side wall, the cutting mechanism being provided for cutting, to a desired length, the wire or tape dispensed from the spool.Type: GrantFiled: December 9, 1976Date of Patent: September 5, 1978Inventor: Elio Montaruli
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Patent number: 4084469Abstract: A cutting apparatus, suitable for cutting or shearing a moving web, comprises first and second wire segments that contact each other at substantially a single point and includes means for causing the point of contact to travel along the length of the wire segments to accomplish the cutting of a web positioned between the wire segments.Type: GrantFiled: December 17, 1976Date of Patent: April 18, 1978Inventor: Herbert Ray Gray
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Patent number: 4080136Abstract: An apparatus and method are disclosed for providing a measured quantity of extrudate material to a receiving means. The extrudate material exits through an outlet, and a cutting surface is positioned adjacent to the outlet. The extrudate material is severed by a cutting means having a flexible and resilient blade for severing the extrudate material into metered charges. The cutting blade contacts the cutting surface during each revolution and bends from a rest condition to a backwardly bent flexed condition. After severing a metered charge, the cutting blade is released from the cutting surface and snaps forwardly to the rest condition to propel the metered charge toward the receiving means at a velocity greater than the average tangential velocity per revolution of the cutting blade.Type: GrantFiled: September 2, 1976Date of Patent: March 21, 1978Assignee: H-C Industries, Inc.Inventor: William N. Peller
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Patent number: 4060017Abstract: A method for cutting lithium metal into a plurality of pieces, and a device for accomplishing the method, are disclosed, comprising the steps of positioning a quantity of lithium metal at a predetermined position between an anvil means and a cutting means which are positioned in operating relationship with each other. A thin flexible film, preferably a plastic, is interposed between the blade and the lithium such that when the blade is forced against the anvil with sufficient force to cut the lithium, the film prevents contact of the blade with the lithium. Indexing of the lithium and the film after each cut permits repetitive cutting to provide a plurality of pieces from the lithium metal stock.Type: GrantFiled: February 18, 1977Date of Patent: November 29, 1977Assignee: Honeywell Inc.Inventor: John R. Backlund
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Patent number: 3955453Abstract: In tube-shearing apparatus of the kind employing relatively transversely moving apertured dies and an internal supporting mandrel, the mandrel comprises an elastomeric body which is compressed axially with the high force to expand it radially against the tube wall such as to form not merely an internal support but effectively a supporting shear blade inside the tube. This allows clean shearing also of tubes having internal protuberances such as welding seams.Type: GrantFiled: June 13, 1974Date of Patent: May 11, 1976Assignee: T.I. (Group Services) LimitedInventors: Richard Quentin Carmichael, Roger George Bonelle