Cold Chisels Patents (Class 30/168)
  • Patent number: 10524803
    Abstract: A surgical blade and method for performing a one-pass wedge osteotomy. The blade includes a body portion, having a cutting tip on a first end for initially cutting into the bone; a cutting slope comprising multiple rows of cutting teeth at multiple planes to resect bone as it enters, leaving a wedge osteotomy; a shaft of a predetermined length and width for supporting the cutting slope; and a saw attachment base on a second end of the blade for engaging a base of a saw to cause the blade to oscillate and perform the wedge osteotomy.
    Type: Grant
    Filed: January 26, 2015
    Date of Patent: January 7, 2020
    Assignee: Cortical Edge Orthopedics, LLC
    Inventor: Keith Richard Anderson
  • Patent number: 10166664
    Abstract: A tool for removing a fastener head from a fastener includes a body that includes an alignment surface configured to couple substantially flush against a structural surface proximate the fastener head. A blade coupled to the body includes a tip configured to sever the fastener head from the fastener as the blade is moved in a first direction generally parallel to the alignment surface from a first blade position to a second blade position. The tool also includes a force transfer member coupled to the body for movement parallel to a longitudinal axis of the force transfer member. The longitudinal axis is oriented at an acute angle with respect to the first direction. The force transfer member is configured to move the blade from the first blade position to the second blade position in response to an impulse received by the force transfer member.
    Type: Grant
    Filed: October 8, 2015
    Date of Patent: January 1, 2019
    Assignee: General Electric Company
    Inventors: Lukasz Sajdak, Kamil Koszarny, James Bradford Holmes
  • Patent number: 8826544
    Abstract: A tool for removal of sealant from grooves adjacent aircraft inspection panels has a handle and a several different removable cutting tool elements. Each removable cutting tool element has at least one sharply defined cutting edge and several sharply defined cutting points.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: September 9, 2014
    Inventor: John David Savage, Jr.
  • Patent number: 8769827
    Abstract: A chisel includes a blade joined with a handle configured to be struck by a striking instrument. The blade includes a front beveled cutting edge portion at its forward end, a beveled side cutting edge portion along one longitudinal side of the blade, and a strike surface along an opposite, longitudinal side. The blade also has a main body portion that narrows in thickness as it extends in a forward direction from a relatively rearward portion thereof to the front beveled cutting edge portion and that narrows in thickness as it extends in a lateral direction from the strike surface towards the beveled side cutting edge portion. The beveled side cutting edge portion has a surface forms an angle with a surface of the main body portion.
    Type: Grant
    Filed: April 11, 2011
    Date of Patent: July 8, 2014
    Assignee: Stanley Black & Decker, Inc.
    Inventors: Russell Powers, Karl Vanderbeek
  • Patent number: 8702359
    Abstract: A method of forming a recess in a work, a work in which the recess is to be formed is a material that can be cut. A cutting tool for forming the recess is held by a moving apparatus at a prescribed angle relative to the work. The cutting tool is moved in a carving direction for carving the work at the prescribed angle, and a thin cutting fin is vertically formed. Then, the cutting tool is moved in the horizontal direction, and the cutting fin is cut and separated from the work. The fin-forming step and the cutting step are repeatedly performed in sequence, whereby a recess having a prescribed depth d and area is formed in the work.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: April 22, 2014
    Assignee: Nakamura Seisakusho Kabushikigaisha
    Inventor: Hideyuki Miyahara
  • Patent number: 7434318
    Abstract: A tool includes a blade having a working edge and an attachment edge opposite the working edge, a handle with distal and proximal ends and a body having at least one diameter. The proximal end is associated with the attachment edge. A hammer element is associated with the distal end, and a periphery of the hammer element extends in a radial direction greater than the at least one diameter of the body.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: October 14, 2008
    Assignee: United States Gypsum Company
    Inventors: Ricardo Perez, Jason Lind, Matthew Earle Myers, Scott Fong
  • Patent number: 7007573
    Abstract: A fastener impact driver device 10 includes a fastener engagement member 12 having a plurality of projections 14 disposed about a lower portion 16 that engages a corresponding peripheral portion 18 of a fastener 20. The device 10 further includes a positioning member 22 having an upper portion 24 that ultimately receives a force thereupon, and a lower portion 26 that engages a cooperating upper portion 28 of the fastener engagement member 12 whereby a force such a hammer strike is imparted upon the upper portion 24 of the positioning member 22 to drive the projections 14 of the fastener engagement member 12 into the head 44 of the fastener 20 without damage of the fastener engagement member 12, whereupon the positioning member 22 is removed from the fastener engagement member 12 and a hand tool is removably secured to the fastener engagement member 12 to impart rotary motion to the member 12 and the fastener 20 thereby removing the fastener 20 from or urging the fastener 20 into a workpiece.
    Type: Grant
    Filed: May 12, 2004
    Date of Patent: March 7, 2006
    Assignee: Eazypower Corporation
    Inventors: Ira M. Kozak, Burton Kozak
  • Patent number: 6796034
    Abstract: A carving tool in which a concave hemispherical cutting head is detachably secured to a base member and a handle by fastener structure, thus securing the cutting head, the base member, and the handle to each other. The carving tool is a swinging impact tool which is used in a manner similar to conventional swinging of an ax or hammer, and thus utilizes the kinetic energy of the swing of the head, applied to materials being worked, at a cutting edge, to perform carving and cutting operations.
    Type: Grant
    Filed: March 28, 2002
    Date of Patent: September 28, 2004
    Inventor: Mark A. Loser
  • Patent number: 6578457
    Abstract: A hand-operated toolholder for a chisel (1) and including a holding member for operating a chisel and having a protection flange at its end facing in a direction opposite to an operational direction (B), a tubular guide (2) for axially guiding the chisel (1) and received in the holding member (3), and a locking mechanism (6) cooperating with the tubular guide (2) for retaining the chisel in the guide.
    Type: Grant
    Filed: February 7, 2001
    Date of Patent: June 17, 2003
    Assignee: Hilti Aktiengesellschaft
    Inventor: Jörg Eichhorn
  • Publication number: 20030056373
    Abstract: An interchangeable head carving tool in which a selected concave hemispherical cutting head is detachably secured to a base member and a handle by a screw, thus securing all parts positively and thereby providing a means of swinging the tool similarity to an ax or hammer and utilizing the kinetic energy released into materials through a 360 degree cutting edge to perform carving and cutting operations.
    Type: Application
    Filed: March 28, 2002
    Publication date: March 27, 2003
    Inventor: Mark Anthony Loser
  • Patent number: 5930899
    Abstract: A pneumatic scraping tool includes a pneumatic hammer assembly including a cylinder in which a piston reciprocates for repeated impact against an anvil or blade holder which is rotatably received within an end of the cylinder and carries a scraping blade. The anvil has an annular flange which stops its insertion in the cylinder, and is retained in place by a nut threadedly engaged with the cylinder and having an end wall spaced from the cylinder end a distance slightly greater than the flange thickness to permit reciprocation of the anvil. Exhaust air passes along a groove in the outer surface of the cylinder to an annular chamber in the nut and thence through four exhaust ports exiting at the end wall of the nut. A plug portion of the anvil projects through a central opening in the nut end wall and is received into a socket in a blade housing. Blade fingers project laterally into the socket.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: August 3, 1999
    Assignee: Snap-on Tools Company
    Inventors: Robert L. Hartman, Roger A. Koessl
  • Patent number: 5784787
    Abstract: A tool used to penetrate ductile sheet metal as the initial penetration in preparation for the attachment or installation of ducting and piping and particularly to forming the initial penetration in sheet metal sheet or ducting from which an opening is made for the attachment of lateral, feed, supply or return duct pipe in heating and air conditioning systems and other process or manufacturing systems employing sheet metal in the system construction. The tool has a shaft with a handle, a top edge and a blade edge with a penetrating point extending from the blade edge. An anvil is affixed to the top edge. A sheet metal workpiece is struck by the tool with the penetrating point causing a penetration in the sheet metal surface in preparation of attachment of ducting or other heating, ventilation and air-conditioning or process systems.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: July 28, 1998
    Inventor: Alan Jensen
  • Patent number: 5621962
    Abstract: A chisel and a method of manufacturing a durable chisel. An axial hole is formed in a chisel so that the hole is open at the chisel tip. Non-metallic powder is then supplied into the axial hole. A core member made of cemented carbide or other material harder than the chisel body is then press-fitted into the axial hole. By inserting the core member into the hole, the non-metallic powder flows so as to fill up any space between the rear end face of the core member and the closed end of the axial hole.
    Type: Grant
    Filed: April 10, 1995
    Date of Patent: April 22, 1997
    Assignee: Nippon Pneumatic Manufacturing Co., Ltd.
    Inventors: Hiroshi Okada, Tetsuji Nakai
  • Patent number: 5433005
    Abstract: A hammer and chisel device for clearing slag from welds includes a chipping chisel interchangeably and springingly affixed within a weighted handle having a slip resistant grip. Since welds often produce slag in a hard to reach spot, the invention provides for repeated one handed slag removal. A sturdy chisel with a resilient cutting surface is replaceably received by the handle utilizing a releasable retaining washer and retaining ring. A spring within the handle returns the chisel shank to an extended position, thereby providing for repeatable hammer-like blows to the chisel shank by the handle. The handle or striking rod includes a chisel shank guide receiving track for consistent sequential strikes without axial rotation. A molded slip resistant grip minimizes necessary grip pressure and prevents hand slippage. Heavy construction provides sufficient force for quick, one handed operation. A slim design provides for easy handling and use in harder to reach places.
    Type: Grant
    Filed: June 27, 1994
    Date of Patent: July 18, 1995
    Inventors: Sean D. Cogdill, Clyde Kranenberg
  • Patent number: 5375332
    Abstract: A hammer driven double cut shear device (10) for punching and cutting sheet metal in a precision fashion; wherein the device (10) includes a handle unit (11) having a punching blade (33) projecting outwardly from one side of the handle unit (11) a cutting blade (32) depending downwardly from the handle unit (11) and a hammer impact surface (25) projecting outwardly from the opposite side of the handle unit (11).
    Type: Grant
    Filed: February 14, 1994
    Date of Patent: December 27, 1994
    Inventor: Peter J. Judge
  • Patent number: 5148599
    Abstract: A mold extractor and method of manufacture thereof is provided. The extractor or tool is used to remove the annular wall, bottom wall, and lid of a plastic mold container from a concrete test sample taken at a construction site for later testing in a test laboratory. The extractor includes a hammer member, a guide member and a chisel member. The hammer is reciprocally displaced by an operator for applying a downward force on the container annular wall at the wall edge. The hammer has a peripheral wall having an elongate hole with an axis through which the guide portion extends. The hammer has enlarged end portions, for gripping by the operator and for applying the impact force. The guide member is an elongate round bar portion which has a handle at the top end thereof. The chisel member has a head portion, a square bar portion, a claw portion, and a chisel end portion. The claw portion is used for lifting the container lid by applying an upward force on the extractor.
    Type: Grant
    Filed: February 1, 1991
    Date of Patent: September 22, 1992
    Inventor: Thomas L. Purcell
  • Patent number: 5058275
    Abstract: A chisel for removing material (5) from a crack defined between two adjacent bricks, comprising a body (1) supporting an elongate tip (2) and defining shoulders (4) extending transversely of the tip. The width of the tip is less than the width of cracks from which it is desired to remove material and the width of the shoulders is greater than the width of the cracks such that the shoulders limit the depth of insertion of the tip into the cracks. The shoulders may be fixed surfaces, which may be covered with or fabricated from materials which will not mark bricks across which they slide, or alternatively the shoulders may be defined by rollers (22).
    Type: Grant
    Filed: March 16, 1990
    Date of Patent: October 22, 1991
    Inventor: Jurg G. Staubli
  • Patent number: 5005286
    Abstract: A mold extractor and method of manufacture thereof is provided. The extractor or tool is used to remove the annular wall, bottom wall, and lid of a plastic mold container from a concrete test sample taken at a construction site for later testing in a test laboratory. The extractor includes a hammer member, a guide member and a chisel member. The hammer is reciprocally displaced by an operator for applying a downward force on the container annular wall at the wall edge. The hammer has a peripheral wall having an elongate hole with an axis through which the guide portion extends. The hammer has enlarged end portions, for gripping by the operator and for applying the impact force. The guide member is an elongated round bar portion which has a handle at the top end thereof. The chisel member has a head portion, a square bar portion, a claw portion, and a chisel end portion. The claw portion is used for lifting the container lid by applying an upward force on the extractor.
    Type: Grant
    Filed: May 1, 1989
    Date of Patent: April 9, 1991
    Inventor: Thomas L. Purcell
  • Patent number: 4875289
    Abstract: A chisel for rotationally disengaging a threaded bolt, nut or screw, has at one end thereof a cutting edge for cutting into and penetrating a surface of the bolt. The chisel further includes a first chisel face terminating at the cutting edge of the chisel, and a stop face positioned away from the cutting edge with the first chisel face disposed between the stop face and the cutting edge. The stop face is at an angle of about 90 degrees or less with respect to the first chisel face. The cutting edge has a width that is about equal to or greater than the distance between the stop face and the cutting edge. The stop face prevents further penetration of the cutting edge into the bolt beyond the stop face so as to provide for application of rotational force to the bolt by the chisel without further penetration of the cutting edge into the bolt.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: October 24, 1989
    Inventor: Denzil C. Poling
  • Patent number: 4829673
    Abstract: A self-actuated woodworking tool [T] for one-handed reciprocating operation has a chambered haft [1] and a tool shank [4] carried captively axially within the haft in slidable, reciprocal relationship. A shank portion [5] extending forwardly from the haft has a cutting edge [6]. A haft ferrule [11] precisely orients the shank and so also the cutting edge angularly with respect to the haft. The haft cross-section permits the user to know by tactile feedback the angular orientation of the haft and thus also the cutting edge. A guide [10] carried by the shank within the chamber cooperates with the ferrule and provides low-friction sliding interengagement between the tool shank and walls of the chamber without radial displacement from the axis. The chamber [3] provides an internal contact surface [16] for hammer-like blows thereon against a shank butt [17] for driving the cutting edge against the workpiece.
    Type: Grant
    Filed: July 6, 1988
    Date of Patent: May 16, 1989
    Inventor: Carroll E. Hicks
  • Patent number: 4813134
    Abstract: A compact, easy-to-use sheet metal tool which is capable of receiving hammer blows and having a cutting element capable of penetrating the sheet metal to create a slot and to cut an extended slot in the sheet, the tool is further provided with a flat guide portion to facilitate proper orientation of the tool and to guide the tool along the surface of the sheet.
    Type: Grant
    Filed: January 27, 1987
    Date of Patent: March 21, 1989
    Inventor: Charles P. Buffin
  • Patent number: 4688856
    Abstract: The round cutting tool (10) comprises a substantially cylindrical shank (11), carrying a separately manufactured annular collar (14) slipped subsequently on the shank and abutting against a stop element (13). As a result thereof, material and energy costs are considerably reduced during the production of the round cutting tool because it is not produced in total in one piece in removing material by dressing.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: August 25, 1987
    Inventor: Gerd Elfgen
  • Patent number: 4633586
    Abstract: A safety chisel especially adapted to shear bolts having a nut permanently attached thereto, while retaining the sheared bolt and nut assembly within a safety container portion of the chisel.
    Type: Grant
    Filed: March 25, 1985
    Date of Patent: January 6, 1987
    Assignee: J. M. Huber Corporation
    Inventors: James M. Yawn, Huby M. Whitaker, Frank Bridgers
  • Patent number: 4620369
    Abstract: A drywall knife includes a handle providing a hammer head and a blade which can be replaced. The blade has a main body and a projecting shank sandwiched between two separate handle portions. The handle portions are secured together and to the shank by nuts and bolts. The bolt heads are recessed in countersink areas formed in one handle portion, and the nuts are received in recesses formed in the other handle portion. The hammer head is an integral part of one handle portion and provides a hammer face on the butt end of the handle.
    Type: Grant
    Filed: August 9, 1984
    Date of Patent: November 4, 1986
    Inventor: Richard H. Gercken
  • Patent number: 4607547
    Abstract: A socket wrench modified by the addition of auxiliary gripper ribs to either prevent bolt head stripper action or to minimize the adverse effects of such stripper action. In one case the bolt head is initially formed to have grooves in its side surfaces mated to gripper ribs on the wrench. In an alternate arrangement the gripper ribs are designed as cutter devices to form grooves in the bolt side surfaces by the application of a hammering force on the wrench.
    Type: Grant
    Filed: February 6, 1985
    Date of Patent: August 26, 1986
    Inventor: Donald G. Martus
  • Patent number: 4586496
    Abstract: A surgical chisel is formed by a flexurally rigid chisel shank and a thin, elongated chisel blade fixed at its front end, which are both displaceably guided in slideways in a chisel guide, which lends the chisel blade buckling resistance.
    Type: Grant
    Filed: March 4, 1985
    Date of Patent: May 6, 1986
    Assignee: Waldemar Link GmbH & Co.
    Inventor: Arnold Keller
  • Patent number: 4549324
    Abstract: A combination of screw spanner and nut breaker includes a head piece having a nut receiving hole and a female threaded longitudinal hole, a tail piece having a first male threaded protrusion and a second male threaded protrusion, each of which is capable of threadingly engaging with the longitudinal hole, a first engaging piece having a first front end having an angled surface formed to match with an angle surface of a nutlike member, a second engaging piece having a second front end having a knife edge and a female threaded cover capable of threadingly engaging with either one of the protrusions to reserve therein the one protrusion. Such a combination bears the function of a screw spanner when the first engaging piece is put between the head and tail pieces and the other protrusion is screwed on the longitudinal hole and can bear the function of a screw nut breaker when the second engaging piece, instead of the first engaging piece, is put between the head and tail pieces.
    Type: Grant
    Filed: May 18, 1984
    Date of Patent: October 29, 1985
    Inventor: Mou T. Liou
  • Patent number: 4548278
    Abstract: A power operated percussion tool in which a shoulder (28) in the tool housing (10, 17) defines a rear rest position for working implement (12) attached to the tool, and in which an energy absorbing bias unit (23, 31) is arranged to resiliently load the working implement (12) toward the rest position. The bias unit (23, 31) comprises a spring (23) and a shock wave mitigating ring assembly (31) and acts between a rearwardly facing shoulder (22) in the housing (10, 17) and a forwardly facing shoulder (30) on the working implement (12). The ring assembly (31) includes two spring steel rings (32, 33) formed with mating conical contact surfaces for transforming axial load variations into radial deformation of the rings (32, 33).
    Type: Grant
    Filed: January 23, 1984
    Date of Patent: October 22, 1985
    Assignee: Atlas Copco Aktiebolag
    Inventor: Per A. L. Gidlund
  • Patent number: 4520564
    Abstract: A tool for removing the outer sheet metal skin of an automobile door. The tool includes a head having a handle and a shank affixed to it, so that the tool can be held and guided by the handle, when operated with a pneumatic hammer or air chisel is coupled to the shank. The tool has a stepped groove formed in the bottom wall of the head, and a removable cutting bit which extends through the head and has its cutting edge co-planar with the bottom of the groove. Forward of the cutting bit the groove is of a deeper depth, and controls the depth of cut made by the tool when the cut edge of the sheet metal skin is seated in the groove behind the cutting bit. A bore also is provided in the head for dispelling the chip or scrape cut from the sheet metal skin.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: June 4, 1985
    Inventor: Gerald P. Wivinis
  • Patent number: 4458416
    Abstract: A vibration damped portable impact tool comprising a pneumatically powered reciprocating mechanism to which a chisel is connected. In the disclosed tool the chisel is rigidly connected to the piston of the reciprocating mechanism so as to move conjointly therewith. The drive mechanism is arranged in a previously known manner to absorb its own acceleration forces whereby the only vibration forces acting on the tool derive from the chisel in its contact with the work piece. By adapting the spring constant relating to bending of the chisel to the entire mass of the tool such that the resonance frequency of that system is lower than the impact frequency, the vibration forces arising at the working end of the chisel are not transmitted to the tool housing.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: July 10, 1984
    Assignee: Atlas Copco Aktiebolag
    Inventors: Gunnar C. Hansson, Per A. L. Gidlund
  • Patent number: 4384621
    Abstract: A device for cutting an edge of a workpiece comprising, a drive head having a carrier, a support bracket connected to the drive head for fixing the drive head with respect to the working piece edge, a tool holder reciprocately movable in and by the drive head, an impact cutting tool connected to the tool holder for cutting the workpiece edge, and a guide sleeve rotatably mounted but fixable in position in the carrier for guiding the motion of the cutting tool. The guide sleeve is rotatable to rotate the cutting tool and bring different edges thereof into a cutting position. Depending on the shape of the cutting tool, a plurality of edges are provided which can be changed as they become dull by rotating the guide sleeve. The axis of a cutting end of the impact tool can also be offset from an axis of the sleeve and an axis of a clamping end of the cutting tool connected to the tool holder to vary the depth at which the edge of the workpiece is cut.
    Type: Grant
    Filed: February 9, 1981
    Date of Patent: May 24, 1983
    Assignee: Trumpf Maschinen AG
    Inventor: Hubert Bitzel
  • Patent number: 4349961
    Abstract: Having a beveled prying edge and a notch for frictional interfitting with a chisel shaft, the removable chisel blade of this invention provides a significant improvement to the process of removing mortar leakage, grout, or spalling from the surfaces of concrete walls. The heat-treated, hardened steel blades have a sharp edge to pry the grout drippage from the surfaces without driving the grout into the surface and without biting into the surface itself. A notch is cut in the body of the blade so that the blade will slide into a throat on a chisel shaft and will frictionally interfit through wedging action with the chisel shaft. Beveled side portions of the tapered notch sides provide improved frictional interfitting. Also, beveled inset grooves on the body of the chiseled blade provide improved frictional interfitting and reduce the tendency of the chisel blade to wiggle in the plane of the blade.
    Type: Grant
    Filed: September 29, 1981
    Date of Patent: September 21, 1982
    Inventor: Harlan C. Pendleton
  • Patent number: 4349058
    Abstract: A cutting tool (20) is disclosed which includes an integrally secured arcuate cutting blade portion (32). The arcuate blade portion is defined from a loci of a perfect circle and includes an axially elongated arcuate blade portion (38) and an axially recessed arcuate blade portion (40). The axial length of the recessed portion is equal to that of an adjacent planar blade portion (42). This configuration permits the elongated arcuate blade portion to be retained within a first distinct cut of the material to be worked on or bone being cut while the entire tool is rotated to a distinct second position along the upper surface of the material in order to perform a distinct second cut. These two distinct cuts serve to form a removable section (58) of the material being worked upon or bone cut, and in this manner adjacent sections of the material can be repositioned relative to one another once the second cut is performed and the section is removed.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: September 14, 1982
    Inventor: John E. Comparetto
  • Patent number: 4345631
    Abstract: A chisel for turning a workpiece spindle has a semi-circular template notch in one end of an elongated blade in combination with a cutting edge and guiding tongue. A beveled portion of the narrow blade forms the cutting edge at one terminus of the notch, and the tongue extends outwardly from the other terminus in diametrically opposed relationship to the cutting edge. The rotating spindle is guided into the constant radius notch by the tongue to permit cutting of a variety of intricate contours in the spindle without gouging and assuring accuracy and reproducibility in turning operations.
    Type: Grant
    Filed: October 24, 1980
    Date of Patent: August 24, 1982
    Inventor: Anton J. Lemler
  • Patent number: 4188722
    Abstract: A cutting tool is provided to efficiently remove a nut from a bolt. An enlongated rod is bifurcated at its lower end to form a pair of arms having cutting edges. A guide collar disposed between the arms is shaped to receive the free end of the bolt and properly position the tool over the nut.
    Type: Grant
    Filed: August 10, 1978
    Date of Patent: February 19, 1980
    Inventor: John O. Young
  • Patent number: 4144868
    Abstract: Chisel for an impact apparatus comprising a stem with connecting means, in line with said stem a blade-shaped, longitudinal chisel part, the free end of which is provided with a plurality of teeth which are thicker than the blade-shaped part. Extending from between the teeth either straight or undulated grooves are arranged in the blade-shaped part.
    Type: Grant
    Filed: July 5, 1977
    Date of Patent: March 20, 1979
    Inventor: Hermanus A. Heitbrink
  • Patent number: 4128351
    Abstract: An improved surgical needle of the type having a simple main cutting edge extending across the needle and formed by the intersection of two planar surfaces for use in cutting through hard body tissue material. The forward end of the needle includes a relatively small third substantially planar surface having an acute angle of convergence with the axis of the needle and intersecting at substantially equal acute angles with the other two planar surfaces. The surgical needle is preferably curved in the reference plane defined by the main cutting edge and the axis of the needle. Such an improved surgical needle results in an extremely sharp needle with a high resistance to burring.
    Type: Grant
    Filed: April 15, 1977
    Date of Patent: December 5, 1978
    Assignee: Deknatel Inc.
    Inventors: Leonard D. Kurtz, Philip Ludwig
  • Patent number: 4089562
    Abstract: An asphalt-paving cutter tool, adapted to be driven by a power-operated hammer mechanism, has an upper shank adapted to be received and held in the socket of the hammer mechanism, and a wide lower cutter portion terminating at the lower end in a chisel-like cutting edge. Intermediate the upper shank and the lower cutter portion is a wedging-and-reaction portion having divergently-upward sidewalls inclined at an angle of the order of relative to the vertical. This portion has two functions. It develops a wedging force to widen the cut, and it develops a reaction force in the blade-lifting direction. These two forces facilitate removal of the cutting tool from the asphalt paving after the cut has been made.
    Type: Grant
    Filed: April 27, 1977
    Date of Patent: May 16, 1978
    Inventor: Frederick F. Baumeister
  • Patent number: 4083111
    Abstract: A nut cutter for cutting through nuts that are rusted or otherwise frozen to bolts or other threaded fasteners. The working end section of the chisel-like nut cutter includes a pair of bifurcated sharpened tines. The central notch separating the bifurcated tines is shaped to facilitate cutting nuts that are relatively inaccessible using the nut cutter held either coaxially with or at an angle to the longitudinal axis of the nut.
    Type: Grant
    Filed: May 5, 1977
    Date of Patent: April 11, 1978
    Assignee: H and W Tool Sales
    Inventor: Harry A. Kerins
  • Patent number: 4062117
    Abstract: A relatively small, pocketable rescue tool for cutting and/or breaking various substances in order to free trapped victims from automobiles and the like. The tool includes first and second members integrally joined together by a throat member with the first and second members extending in substantially the same direction and being substantially parallel with one another. The second member includes a notch portion having a cutting surface around at least a part thereof for allowing the rescue tool to be used to cut various substances such as seat belts, shoulder harnesses and sheet metal. The notch portion is positioned substantially parallel to the first member. The throat member extends between the first and second members substantially adjacent the forward end of the rescue tool. An anvil portion may be provided on the rearward end of the second member for allowing the rescue tool to be used to break various substances such as the windows of an automobile or the like.
    Type: Grant
    Filed: September 27, 1976
    Date of Patent: December 13, 1977
    Inventor: John D. Coleman
  • Patent number: 3974868
    Abstract: A hand tool including a blade or tool part with a connected tang and a handle part with an aperture extending axially from one end for receiving the tang, a locking pin extending diametrically across the handle part and the tang being provided with a slot for the passage of said locking pin to a cross bore in the tang, the locking pin being rotatable or axially movable to engage it with said cross bore.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: August 17, 1976
    Assignee: The Jacobs Manufacturing Company Limited
    Inventor: George Cecil Derbyshire
  • Patent number: 3962786
    Abstract: This invention relates to an apparatus for cutting away rivets of tensioned reinforcements which are protruding beyond the surface of a tension plate used for tensioning the reinforcements in order to increase the strength of a concrete product, characterized in that a chisel, for cutting rivets formed at the end of the tensioned reinforcements, is provided in such a manner that it can slide along the normal line of the tension plate and in contact with the surface of the tension plate, the chisel being interlocked with a fluid-pressure sliding mechanism, and further an immovable part of the mechanism is engaged with a part of the tension plate so that the counter force against the cutting by the chisel is obtained from the tension plate.
    Type: Grant
    Filed: December 30, 1974
    Date of Patent: June 15, 1976
    Assignee: Nippon Concrete Industries Co. Ltd.
    Inventors: Takemitsu Mori, Katsunori Miyata
  • Patent number: 3935889
    Abstract: A hand tool including a blade or tool part with a connected tang and a handle part with an aperture extending axially from one end for receiving the tang, a locking pin extending diametrically across the handle part and the tang being provided with a slot for the passage of said locking pin to a cross bore in the tang, the locking pin being rotatable or axially moveable to engage it with said cross bore.
    Type: Grant
    Filed: November 21, 1974
    Date of Patent: February 3, 1976
    Assignee: The Jacobs Manufacturing Co., Ltd.
    Inventor: George Cecil Derbyshire