Rod Encircling Type Patents (Class 81/27)
  • Patent number: 9149922
    Abstract: A striking or shaping tool structured to size and/or otherwise shape an object such as, but not limited to a jewelry object, which is mounted on a mandrel. The tool comprises a generally hammer-like construction including a head having a base. A striking member, having a striking surface, and an alignment member are connected to the base and are cooperatively dimensioned and disposed. The striking member also includes a mandrel engaging portion comprising one or more recessed, exposed surfaces dimensioned and configured to substantially conform to an exterior surface of the mandrel. The cooperative dispositions and dimensions of a recessed exposed surface and the alignment member facilitate a concurrent, movable engagement thereof with the mandrel during a striking procedure of the striking surface on the mandrel mounted jewelry object, resulting in a predetermined operative orientation of the striking surface relative to the jewelry object, during the striking procedure.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: October 6, 2015
    Inventor: George Vazikas
  • Patent number: 9023057
    Abstract: An impacting device for inserting, positioning and/or removing an implant and/or performing other impacting applications. The impacting device may have a head having at least one recess. The recess may have a insertion channel and a locking chamber. In one embodiment, the insertion channel and the locking chamber may be connected by an axial channel. The recess may pass through a lateral surface of the head so that the base surface may remain cohesive or unobstructed. A guide means, such as a guide rod, may be positioned though the recess so that the head may be moveable on the guide means and not disengage the guide means. A shaft having a handle may be attached to the head to assist a surgeon in moving the head on the guide means.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: May 5, 2015
    Assignee: DePuy Synthes Products, Inc.
    Inventors: Markus Buttler, Patrick Streff
  • Patent number: 8839696
    Abstract: A multi-purpose paint can tool for removing a paint can lid, creating paint drainage holes within the rim of the paint can, and tamping the paint can lid closed when finished painting. The multi-purpose paint can tool of the present invention generally comprises a piston shaft that is axially movable within a tubular housing. The tubular housing may comprise a can lid opening implement on its distal end. Thereafter, axial movement of the piston shaft by user interaction with a gripping knob and lid tamping implement on the distal end of the piston shaft allows at least one piercing spike at the distal end of the piston shaft to penetrate the lower rim portion of a conventional paint can. The gripping knob and lid tamping implement may then be used to tamp the lid back onto the paint can when the painting project is completed.
    Type: Grant
    Filed: July 2, 2012
    Date of Patent: September 23, 2014
    Inventors: Frederick Harrington, Kent Connick
  • Patent number: 8746111
    Abstract: A wrench assembly is mounted on a drill rig so as to have some freedom of movement in three axes. The wrench assembly includes a wrench subassembly having an upper wrench and a lower wrench. Both the upper wrench and the lower wrench are provided with jaw assemblies that are adapted to grip a pipe section or to release it. One of the upper wrench and lower wrench is pivotally moveable with respect to the other to apply a twisting force to a pipe section gripped by one of the upper and lower wrenches with respect to an adjacent pipe section gripped by the other of the upper and lower wrenches. The wrench assembly also includes a generally planar support table. The wrench subassembly is attached to the support table in such a manner as to allow the wrench subassembly to pivot about an axis that is perpendicular to the plane of the support table, and in such a manner as to allow the wrench subassembly to tilt with respect to the plane of the support table.
    Type: Grant
    Filed: April 15, 2011
    Date of Patent: June 10, 2014
    Assignee: Astec Industries, Inc.
    Inventors: John J. Eglin, Neil M. Baker
  • Patent number: 8695458
    Abstract: A slide hammer may be provided. The slide hammer may include: a body defining a through hole and a first attaching surface; an auxiliary weight having a second attaching surface configured to attach to the body at the first attaching surface, the auxiliary weight having a through hole located to align with the through hole in the body when the auxiliary weight is attached to the body; and a shaft located in the through holes in the body and auxiliary weight. A method of constructing a slide hammer is provided.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: April 15, 2014
    Assignee: Bosch Automotive Service Solutions LLC
    Inventors: Robert Jensen, Robert Kochie, Michael White, Larry Betcher
  • Publication number: 20140000920
    Abstract: A slide hammer device having a guide sleeve, a selectively moveable elongate rod received within the guide sleeve, and a hammer assembly coupled to the elongate rod. The hammer assembly is shaped to accomplish removal of an inner tube from within a pipe element. The guide sleeve has a protective flange that protects a user's hand during advancement of the slide hammer device toward an opening of the pipe element.
    Type: Application
    Filed: June 28, 2012
    Publication date: January 2, 2014
    Applicant: Longyear TM, Inc.
    Inventor: ALAN RICHTER
  • Patent number: 8486084
    Abstract: A slap hammer including an adjustable striking member and a releasable retaining mechanism for releasably retaining a sliding weight is disclosed. One described slap hammer comprises a guide rod having a first end and a second end; a striking member coupled to the second end of the guide rod and movable relative to the first end of the guide rod; a sliding weight slidable along the guide rod between the first end of the guide rod and the striking member; a biasing element positioned between the sliding weight and the first end of the guide rod, the biasing element biasing the sliding weight towards the second end of the guide rod; and a releasable retaining mechanism for releasably retaining the sliding weight against the action of the biasing element.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: July 16, 2013
    Inventor: Donald Huene
  • Patent number: 8438953
    Abstract: A hammering tool with buffer design includes: a hammering member, a protrusion block section extending from a lower side of the hammering member, a right side of upper section of the protrusion block section being notched to form a first receiving space; a handle member having a grip section, a first plate section, a second plate section and a third plate section being disposed at an upper end of the grip section to define a receiving chamber for inserting the protrusion block section therein; a pivot member for pivotally connecting the protrusion block section of the hammering member with the handle member; and a buffer assembly including a first compression spring received in the first receiving space. A right end face of the protrusion block section of the hammering member is spaced from a left face of the first plate section by a predetermined buffering distance.
    Type: Grant
    Filed: January 24, 2011
    Date of Patent: May 14, 2013
    Inventor: Kuan-Wei Chen
  • Patent number: 8387487
    Abstract: A tactical entry tool for creating an entry point through a building structure is provided. The tool includes a shaft portion including a shaft, and a head portion attached to a first end of the shaft. The head portion includes two heads, with each head including a head shaft extending from the shaft to form a ‘Y’ shaped structure and a break head portion attached to the head shaft at an opposite end from which the head shaft is connected to the shaft. Each break head portion includes a plurality of teeth surrounding the perimeter of the break head portion and a plurality of breaker tips extending from the break head portion.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: March 5, 2013
    Assignee: J&N Tactical, LLC
    Inventors: Jeffrey Herr, Matt Herr
  • Publication number: 20110113929
    Abstract: An apparatus and method of manufacturing the same are disclosed for an impact device with interchangeable tools for applying precise momentum force to an external object. The device includes two elongated members, one of which containing a hollow portion, and a tool head disposed on one side of the first elongated member. The device can be configured to allow the first elongated member to be removably inserted into the second elongated member and to allow the second elongated member to strike the tool head in order to impart force on an external object.
    Type: Application
    Filed: November 13, 2009
    Publication date: May 19, 2011
    Inventor: Normand Lemelin
  • Publication number: 20100313714
    Abstract: A tool is provided for installing flooring with snap together edges. Specifically, the tool has a longitudinally-extending guide rod having a first impact member having a first impact face at a first end, and a second impact member having a second impact face at a second end. The first impact member has cleat extending below its lower surface adapted for engaging flooring edges. A sole is secured to the lower edge of the first impact member to protect the underlying flooring surface. The second impact member comprises a foot with an impact face. An impactor with first and second impact faces is slidably movable between the first impact member and second impact member for impacting the first and second impact faces respectively.
    Type: Application
    Filed: June 11, 2009
    Publication date: December 16, 2010
    Inventor: Ronnie D. Smith
  • Patent number: 7752944
    Abstract: Objects of the present invention provide a multi-use anchor and system for setting the same. One embodiment of the present invention is directed to a multi-use anchor including a bolt, an elastomeric sleeve fitting over a threaded portion of the bolt, and a receiver arranged to couple to the bolt, where tightening the receiver on the bolt compresses the elastomeric sleeve such that the sleeve radially expands to engage a hole in rigid substrate material.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: July 13, 2010
    Inventor: Thomas Allan Wallek
  • Publication number: 20100170366
    Abstract: The Survey Hub Installation apparatus is principally comprises an elongated rod having a penetration point and penetration anvil at a first end and a Hub receptacle and Hub receptacle anvil at a second end. A hammer is tubularly received at the rod intermediate the penetration anvil and the Hub receptacle anvil. A feather receptacle and a feather hammer is formed at the second end.
    Type: Application
    Filed: January 2, 2009
    Publication date: July 8, 2010
    Inventor: CLYDE GOEKE
  • Publication number: 20090293258
    Abstract: An anchor insertion rod is disclosed for use with an anchor insertion tool removable secured therein for the installation and setting of anchors. The anchor insertion rod comprises an outer member and an inner member slidably mounted within the outer member, whereby the inner member can be extended to increase the length of the insertion rod. Upper and lower stop members are positioned on the insertion rod, along with a slide hammer surrounding a portion of the insertion rod that moves along the insertion rod between the upper and lower stop members. To install an anchor, the insertion rod is raised to align an anchor within the anchor insertion tool with a pre-drilled hole in the surface in which the anchor is to be mounted. The slide hammer is moved to forcibly contact the upper stop member to impart an impacting force to insert the anchor. The anchor is set by moving the slide hammer to contact the lower stop member and impart a setting force to the lower stop member.
    Type: Application
    Filed: June 4, 2009
    Publication date: December 3, 2009
    Inventor: Robert Cousineau
  • Publication number: 20090120243
    Abstract: A nail is held within a cylindrical nail receiver by a magnetized tip of a cylindrical driver rod. As the driver sleeve is moved toward a surface, the driver rod drives the nail into the surface leaving a predetermine space between the head of the nail and the surface. A coil spring, attached to the nail receiver and allows for the nail receiver to be adjusted for several nail lengths thus allowing for an accurate placement of the nail against the wall. The nail receiver is interchangeable to allow use of the device with nails and anchors of differing diameters.
    Type: Application
    Filed: November 7, 2008
    Publication date: May 14, 2009
    Inventor: Andres Nemeth
  • Publication number: 20080257113
    Abstract: A manually operated stake driver has a slide hammer and guide. The guide is fitted with a receiver that captures and guides the stake. The slide hammer provides percussion force directly to the stake by extending into the receiver when the slide hammer is actuated. The slide hammer may have a weight attached or incorporated into a handle to provide additional force to the stake when actuated. In one embodiment, the stake driver may be designed to be used while the operator is standing and to drive stakes into the ground.
    Type: Application
    Filed: October 12, 2006
    Publication date: October 23, 2008
    Inventor: Arthur F. Neumarkel
  • Patent number: 7398628
    Abstract: A tool and method for abutting an individual floor panel which is near an obstruction, such as a wall, to the assembled floor. The tool and method provide a rod having a flanged member at one end. The flanged member has a notch in its vertical flange which contacts the floorboard to be abutted, requiring a minimal amount of space between the obstruction and floorboard to be set. A sliding weight mounted on a rod can then be slid toward an impact surface resulting in a horizontal force being applied to the individual floorboard thereby abutting or setting that floorboard with respect to the assembled floor. An especially useful application for the device and method is in the installation of a tongue-in-groove laminate floor in which the individual floorboards have a tongue and groove connection on their ends.
    Type: Grant
    Filed: May 13, 2004
    Date of Patent: July 15, 2008
    Inventor: Jefferson Van Horne, Jr.
  • Publication number: 20080041191
    Abstract: A tubular wrench adapted for firmly engaging a connection fitting, including a cylindrical, hollow outer sleeve having an outer sleeve head located on at least one end of the outer sleeve, a cylindrical, hollow inner sleeve having an inner sleeve head located on at least one end of the inner sleeve, wherein the inner sleeve is passed through the outer sleeve, allowing the inner sleeve to connect to the lower end of a desired connection fitting while the outer sleeve connects to the upper end of a desired connection fitting. Methods of assembling and disassembling a connection fitting with the tubular wrench.
    Type: Application
    Filed: August 14, 2007
    Publication date: February 21, 2008
    Inventor: Erin McDermott
  • Patent number: 7191685
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end, or the impact head movement may be controlled by a spring. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips. Each of the tips has particular advantages in applying force to a targeted object.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: March 20, 2007
    Assignee: Slide Sledge Technology, Inc.
    Inventor: John K. Lowther
  • Patent number: 7140274
    Abstract: The present invention relates to an impact tool, and more particularly, to an apparatus and method for resetting a fastener that allows a force from an impact member to be transferred to the fastener in order to reset the fastener below a surface plane of a material. The apparatus comprises an impact member connected with a guide member, such that the impact member is freely slideable in relation to the guide member between a retracted position and an extended position. A user may reset the fastener by forcing the impact member from the retracted position to the extended position, where a portion of the impact member is extended beyond the guide member to come into contact with the fastener and thereby reset the fastener below the surface plane of the material.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: November 28, 2006
    Inventor: Doug Foster
  • Patent number: 6983674
    Abstract: An impact device has a handle attached to an impact head. A weight is reciprocatably mounted on a guideway on the impact head. The weight can move along the guideway between a first position and a second position in response to motion of the head. A yielding member such as a spring or elastomeric element can be mounted at the impact head. The weight can recoil against the yielding member in response to motion of the head. The impact head can hit an object in such a manner as to move the weight in a straight line from the first position to the second position.
    Type: Grant
    Filed: January 7, 2004
    Date of Patent: January 10, 2006
    Inventor: Joseph Rufolo, Jr.
  • Patent number: 6786491
    Abstract: The present disclosure relates to a quick tool coupler adapted to a sliding hammer allowing quick change of its tools.
    Type: Grant
    Filed: April 2, 2002
    Date of Patent: September 7, 2004
    Inventor: Marc Carbonneau
  • Publication number: 20040134312
    Abstract: An impact installer of concrete anchor drive pins into a predrilled hole by a slide hammer-type action with a consumable midsection of tubing that is to be replaced as needed for length or wear that is attached to the slide hammer assembly and the anchor adapter assembly that holds the concrete anchors so that the anchor drive pins may be inserted with an installer at floor level to a concrete ceiling above or other situations like a concrete wall where hammering the anchors in by hand is not feasible nor convenient. A slot in the adapter that holds the concrete drive pin will support an eyelet drive pin that has a pretied wire attached so the pretied wire is not damaged during installation.
    Type: Application
    Filed: January 14, 2003
    Publication date: July 15, 2004
    Inventor: Shawn Carl Hodges
  • Patent number: 6708585
    Abstract: A driver tool for small nails and brads having a tubular body within which a plunger is reciprocal. The upper end of the plunger and the body are connected by an elastomeric member so that a manual force may be applied to draw the plunger upward. Upon release, the plunger descends to impact the nail or brad within the lower end of the tubular body. The lower driver head end of the plunger is magnetized.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: March 23, 2004
    Inventor: Charles R. Posenauer
  • Publication number: 20040045412
    Abstract: The present invention comprises a strong sleeve with a strong sliding member which concentrates force at the end farthest from the user in order to reshape the workpiece.
    Type: Application
    Filed: September 10, 2002
    Publication date: March 11, 2004
    Inventor: Terry Lee Cotner
  • Publication number: 20020178870
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end, or the impact head movement may be controlled by a spring. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips. Each of the tips has particular advantages in applying force to a targeted object.
    Type: Application
    Filed: July 9, 2002
    Publication date: December 5, 2002
    Inventor: John K. Lowther
  • Patent number: 6474198
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips. Each of the tips has particular advantages in applying force to a targeted object.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: November 5, 2002
    Assignee: Slide Sledge Technology, Inc.
    Inventor: John K. Lowther
  • Publication number: 20020046631
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips. Each of the tips has particular advantages in applying force to a targeted object.
    Type: Application
    Filed: December 7, 2001
    Publication date: April 25, 2002
    Inventor: John K. Lowther
  • Patent number: 6349618
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips. Each of the tips has particular advantages in applying force to a targeted object.
    Type: Grant
    Filed: October 2, 2000
    Date of Patent: February 26, 2002
    Inventor: John K. Lowther
  • Patent number: 6240699
    Abstract: An improved method and apparatus for anchoring tensioning members in a concrete structure and the like wherein there is provided a wedge support member having wedge-receiving pockets coaxially aligned with the anchor seats in an anchorage block permitting the anchorage wedges to first be inserted into the pockets not allowing the tensioning members to slip during tensioning. This method is used in post-tensioning of monostrand cable. The apparatus anchors the tensioning members by installing wedges into their respective wedge seats. A magnetic tip is utilized to hold the wedges in place while a slide hammer provides and transmits the energy to forcibly insert the wedges.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: June 5, 2001
    Inventors: Wayne Alan Scanlon, Dale Andrew Granger
  • Patent number: 6226948
    Abstract: An injection packer, injection packer installation/removal tool, and method of use thereof are especially suited for use in the repair of concrete structures and the like. The injection packer includes a body that is removable from a nonmetallic expansion member that may remain within a repair bore after the injection material is injected into the repair bore. The packer body includes a shank, nozzle, and keyed head with an injection bore therethrough. The nozzle is threaded to engage a nonmetallic nut attached to the expansion member. In use, as the packer body is rotated in a first direction the expansion member is compressed between the nut and the packer body shank, thereby radially bulging the expansion member. At this point fluid may be injected through the injection packer and into the bore and crack(s). As the packer body is rotated in a second direction the expansion member is uncompressed. The packer body is easily detachable from the expansion member.
    Type: Grant
    Filed: May 26, 1999
    Date of Patent: May 8, 2001
    Inventor: John F. Trout
  • Patent number: 6223627
    Abstract: An anti-shock structure of a hammer handle comprises a main rod, a handle sleeve, an elastic element, and a plug. A longitudinal storing slot is disposed inside the handle sleeve. The elastic element is disposed in the longitudinal storing slot. One end of the elastic element has a U-shaped portion. The elastic element's cross-sectional width is less than the longitudinal storing slot's cross-sectional width. So, during the swinging movement before knocking, the U-shaped portion of the elastic element will resist the reactive force so as to ensure the excellent holding effect. After the knocking, an opened portion of the elastic element will absorb the shock. That is, both excellent holding effect and the anti-shock function are achieved.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: May 1, 2001
    Inventors: Yi Jing Jan, Hui Jen Wang
  • Patent number: 6125719
    Abstract: A slide hammer includes three major components, namely, a guide sleeve, a plunger and an impact head. The plunger is inserted within the guide sleeve. The impact head is secured within the distal end of the guide sleeve, and has a portion which protrudes from the guide sleeve distal end. The impact head is able to freely slide within a segmented portion of the guide sleeve distal end. The plunger is slid within the guide sleeve at a selected velocity in order to contact the portion of the impact head slidably secured within the guide sleeve. The force of the plunger striking the impact head is transmitted through the impact head to a targeted object in contact with the protruding portion of the impact head. The impact head may be fitted with various types of tips.
    Type: Grant
    Filed: March 30, 1999
    Date of Patent: October 3, 2000
    Assignee: Slide Sledge Technology, Inc.
    Inventors: John K. Lowther, Kenneth W. Welden
  • Patent number: 6109292
    Abstract: A method and system for installing, removing and actuation a rotatable keyed actuation portion or lower valve stem portion of a fire hydrant or other valve device consisting of a first device for installing a rotatable keyed actuation portion, a second device for removing a rotatable keyed actuation portion and a third device for actuating a rotatable keyed actuation portion or a lower valve stem portion of a fire hydrant or other valve device.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: August 29, 2000
    Inventor: Peter M. Fox
  • Patent number: 5250051
    Abstract: The acetabular cup positioner of this invention provides for a sighting guide which is removable connected to the shaft of the cup positioner by a tapered locking configuration. The taper lock provides for a secure connection of the sighting guide to the shaft of the cup positioner which enhances the accuracy of the device. The taper lock provides such a strong lock that in order to provide for its removal, the cup positioner of the invention includes a slaphammer carrier on the shaft of the guide which may be employed by the surgeon to remove the guide from the positioner without undue effort.
    Type: Grant
    Filed: February 8, 1993
    Date of Patent: October 5, 1993
    Assignee: Zimmer, Inc.
    Inventor: John P. Maryan
  • Patent number: 5109739
    Abstract: A slide hammer tool adapted to be used with attachments to engage various standard wrenches such as braking bars, open end wrenches, box wrenches, etc., and cooperates with a socket set to loosen or tighten "frozen" bolts and nuts.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: May 5, 1992
    Inventors: Harold L. Hull, Brian D. Hale
  • Patent number: 4785692
    Abstract: A tool for driving wooden plugs in spike holes of railroad ties following removal of railroad spikes from the wooden tie prior to track regauging and/or replacement. An elongated main body rod of steel is provided having a permanently affixed collar or washer at one extreme end thereof and another permanently affixed collar or washer approximately midway thereof. Slidably mounted between the two collars is a hand-operated driving weight. The other end of the elongated rod has a reduced rod extension portion which has a slidable plug holding sleeve thereon. The extreme tip of this other end is threaded and receives an adjusting nut on the threads for predetermining the desired depth of wooden plug driving into a railroad tie.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: November 22, 1988
    Inventor: Dennis W. Holmes