Patents by Inventor David L. Durfee, Jr.

David L. Durfee, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10368628
    Abstract: A strap is provided which may be attached to a rear portion of the casing of a cell phone obviating the need for a user to wrap her/his hand around the phone. A plurality of embodiments depict different quick-change ways of attaching the strap to the casing or directly to the back of a cell phone. A quick-removal holster is also described, as is a belt clip which engages the strap without the need to grasp the phone casing. The case is provided with a compartment for 2-3 credit card-sized items. A retractable kick stand forms a hood over the compartment providing physical and visual protection to the contents of the compartment and a pusher is provided to facilitate removal of the items.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: August 6, 2019
    Inventor: David L. Durfee, Jr.
  • Patent number: 9915095
    Abstract: A clamping system for supporting an extension ladder on a gutter utilizes at least one and, more preferably, a pair of identical, clamp(s) to capture the ladder preventing movement laterally or horizontally away from the gutter. The clamp includes a clamp body with a latch pivotably mounted thereto which is spring biased to the gutter-clamping position. A lock screw may be utilized to prevent the latch from releasing the gutter preventing the ladder from moving. A pair of ears extends from each side of the clamp body and have slots which engage the channels on a forward face of the ladder leg.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: March 13, 2018
    Assignee: Ladder Mates USA
    Inventor: David L. Durfee, Jr.
  • Patent number: 9441654
    Abstract: A locator/fastener has a first outer member with a precision-machined external body portion, a retention head protruding from a first end, and a multi-diameter throughbore. A fastener, which may take the form of a cap screw, floats in the throughbore of the locator with the threaded portion protruding from a second end of the locator. A receiver has an internal precision-machined surface which contacts the precision-machined body portion of the locator and a threaded bore which receives the protruding fastener. By separating the locating and fastening functions, a quick connect disconnect device is created which does not bind or gall. A hangar system allows a sub-base plate to be attached to a base using the locator-fastener disclosed herein.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: September 13, 2016
    Assignee: Modern Industries, Inc.
    Inventor: David L Durfee, Jr.
  • Patent number: 9427862
    Abstract: A hand tool is provided with a mechanism which permits the handle of a hand tool to be adjusted through a wide array of angles relative to the implement to which it is attached to accommodate different sized users and uses of the tool. Further, a quick connect apparatus permits any of a plurality of hand tools to be connected to a single handle.
    Type: Grant
    Filed: October 4, 2013
    Date of Patent: August 30, 2016
    Inventor: David L. Durfee, Jr.
  • Publication number: 20150345527
    Abstract: A locator/fastener has a first outer member with a precision-machined external body portion, a retention head protruding from a first end, and a multi-diameter throughbore. A fastener, which may take the form of a cap screw, floats in the throughbore of the locator with the threaded portion protruding from a second end of the locator. A receiver has an internal precision-machined surface which contacts the precision-machined body portion of the locator and a threaded bore which receives the protruding fastener. By separating the locating and fastening functions, a quick connect disconnect device is created which does not bind or gall. A hangar system allows a sub-base plate to be attached to a base using the locator-fastener disclosed herein.
    Type: Application
    Filed: June 3, 2014
    Publication date: December 3, 2015
    Inventor: David L Durfee, JR.
  • Patent number: 8740528
    Abstract: A locator/fastener has a first outer member with a precision-machined external body portion, a retention head protruding from a first end, and a multi-diameter throughbore. A fastener, which may take the form of a cap screw, floats in the throughbore of the locator with the threaded portion protruding from a second end of the locator. A receiver has an internal precision-machined surface which contacts the precision-machined body portion of the locator and a threaded bore which receives the protruding fastener. By separating the locating and fastening functions, a quick connect disconnect device is created which does not bind or gall. A hangar system allows a sub-base plate to be attached to a base using the locator-fastener disclosed herein.
    Type: Grant
    Filed: March 30, 2010
    Date of Patent: June 3, 2014
    Inventor: David L. Durfee, Jr.
  • Publication number: 20100260575
    Abstract: A locator/fastener has a first outer member with a precision-machined external body portion, a retention head protruding from a first end, and a multi-diameter throughbore. A fastener, which may take the form of a cap screw, floats in the throughbore of the locator with the threaded portion protruding from a second end of the locator. A receiver has an internal precision-machined surface which contacts the precision-machined body portion of the locator and a threaded bore which receives the protruding fastener. By separating the locating and fastening functions, a quick connect disconnect device is created which does not bind or gall. A hangar system allows a sub-base plate to be attached to a base using the locator-fastener disclosed herein.
    Type: Application
    Filed: March 30, 2010
    Publication date: October 14, 2010
    Inventor: David L. Durfee, JR.
  • Patent number: 7686553
    Abstract: A locator/fastener has a first outer member with a precision-machined external body portion, a retention head protruding from a first end, and a multi-diameter throughbore. A fastener, which may take the form of a cap screw, floats in the throughbore of the locator with the threaded portion protruding from a second end of the locator. A receiver has an internal precision-machined surface which contacts the precision-machined body portion of the locator and a threaded bore which receives the protruding fastener. By separating the locating and fastening functions, a quick connect disconnect device is created which does not bind or gall. A hangar system allows a sub-base plate to be attached to a base using the locator-fastener disclosed herein.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: March 30, 2010
    Inventor: David L. Durfee, Jr.
  • Patent number: 6896643
    Abstract: The actuator for the exercise machine is mounted to the seat to pivot about a vertically extending axis to permit the user to rotate her/his upper torso and vary the muscle groups being exercised to enhance the beneficial effects. A rotational connection between a shoulder harness element and the actuator arm facilitates this side crunching motion. A second feature which may be used separately or in conjunction with the rotational actuator, is an actuator arm with both a shoulder socket and an elbow joint that pivot, the elbow joint requires additional force to break over. This dual-pivot actuator arm permits the user to perform abdominal crunches with a predetermined resistance.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: May 24, 2005
    Assignee: New Eagle Corporation
    Inventor: David L. Durfee, Jr.
  • Patent number: 6619895
    Abstract: The invention relates to a workpiece support assembly including an indexing unit adapted for the automated adjustment of a workpiece being machined. The assembly includes a central support column having at least one indexing unit secured thereto. The indexing unit includes a base member integrated with the central support column, a main body to which a workpiece may be selectively secured and a locking assembly permitting the selective locking and rotation of the main body relative to the base member. The main body is mounted on the base member for selective rotation required to rotate a workpiece as mounted.
    Type: Grant
    Filed: June 6, 2000
    Date of Patent: September 16, 2003
    Inventor: David L. Durfee, Jr.
  • Patent number: 6409161
    Abstract: The housing of a two station machining device has thereon a stationary jaw and two movable jaws reciprocable between open and closed positions relative to the stationary jaw by a pair of spaced slides that are reciprocable in a recess in the housing beneath the work surface. A piston in the recess has one end thereof secured to one of the slides and has its other end slidable sealingly in an axial bore and counterbore in the other slide. Normally the slides and the piston are retained resiliently in first limit positions in which the movable jaws are disposed in their open positions. Hydraulic fluid under pressure is supplied to the bore in the other slide beneath the head of the piston initially to move the piston and the one slide into second limit positions in which the jaw connected to the one slide is moved to its closed position, and then to move the other slide to a second limit position and its associated jaw to be moved to its closed position.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: June 25, 2002
    Assignee: Parlec, Inc.
    Inventors: Bradley D. Wolff, Matthew T. Hoyt, David L. Durfee, Jr.
  • Patent number: 6250620
    Abstract: A machining vise which includes a main body having a recess for guiding movable vise jaws therein is disclosed. The vise also includes a stationary jaw removably mounted at a mid-point on the main body, a first movable slide and a second movable slide. The first and second slides are mounted in the recess for guiding the movable vise jaws, wherein the first jaw is removably mounted to the first movable slide and the second jaw is removably mounted to the second movable slide.
    Type: Grant
    Filed: December 21, 1999
    Date of Patent: June 26, 2001
    Assignee: Parlec, Inc.
    Inventor: David L. Durfee, Jr.
  • Patent number: 6244580
    Abstract: A machining vise is disclosed. The machining vise includes a main body having a recess, a stationary vise jaw removably mounted at a mid-point on the main body, a first movable slide and a second movable slide mounted in the recess. A first vise jaw is mounted to the first movable slide and a second vise jaw is mounted to the second movable slide. The vise also includes a drive for moving the first and second movable slides, wherein a controlled release assembly associated with the first movable slide controls the movement of the first movable slide and the second movable slide. The controlled release assembly includes an offset adjustment mechanism and a spring biasing mechanism. The vise further includes a structure for releasably securing the vise jaws to the slides.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: June 12, 2001
    Assignee: Parlec, Inc.
    Inventor: David L. Durfee, Jr.
  • Patent number: 6017026
    Abstract: A machining vise which includes a main body having a recess for guiding movable vise jaws therein is disclosed. The vise also includes a stationary jaw removably mounted at a mid-point on the main body, a first movable slide and a second movable slide. The first and second slides are mounted in the recess for guiding the movable vise jaws, wherein the first jaw is removably mounted to the first movable slide and the second jaw is removably mounted to the second movable slide.
    Type: Grant
    Filed: December 11, 1997
    Date of Patent: January 25, 2000
    Inventor: David L. Durfee, Jr.
  • Patent number: 5984290
    Abstract: In a two station machining vise having a stationary, center jaw and movable opposing jaws, the interior of the vise body is totally enclosed to protect the working components from machining byproducts. The vise has a brake mechanism and an offset mechanism associated with one slide so that workpieces can be engaged and released sequentially. If the brake mechanism is not activated, the two movable jaws are moved simultaneously. With the brake mechanism engaged, one movable jaw is moved to position first and then the movable jaw having the brake and offset mechanisms connected therewith is subsequently moved into position. When the workpieces are to be released, the second movable jaw is first retracted the offset distance and then the first movable jaw must be completely retracted prior to any subsequent movement by the first movable jaw.
    Type: Grant
    Filed: October 15, 1997
    Date of Patent: November 16, 1999
    Assignee: Te-Co.
    Inventor: David L. Durfee, Jr.
  • Patent number: 5623757
    Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 29, 1997
    Assignee: Toolex Systems, Inc.
    Inventor: David L. Durfee, Jr.
  • Patent number: 5505437
    Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.
    Type: Grant
    Filed: April 19, 1994
    Date of Patent: April 9, 1996
    Inventor: David L. Durfee, Jr.
  • Patent number: 5458321
    Abstract: In a wide-opening vise having two movable jaws and a fixed center jaw, the movable jaws are easily removed and reset onto associated slides. The slides have upperly projecting bodies with pressure release latches for positively fixing the jaws in position on the slides. Further, a brake and off-set assembly is associated with one movable slide. The combination allows the second movable jaw, after the first movable jaw has engaged a workpiece, to engage and disengage from a workpiece without effecting the engagement of the first movable jaw with its held workpiece. At least two off-set positions are provided for the engagement and disengagement of the second movable jaw.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 17, 1995
    Inventor: David L. Durfee, Jr.
  • Patent number: 5133135
    Abstract: This invention relates to a gauge device which may be used by a toolmaker or machinist to determine the squareness of surfaces on a workpiece. The device has a handle having a gauge mounted adjacent an end of the arm opposite the handle and an intermediate contact point such that the inner surface of the handle and the intermediate contact point define the planes of the surfaces of the workpiece to be measured. The device is easily used, easily transported, and capable of use with work-pieces having chamfered or otherwise altered corners, holes, slots or other imperfections that make determination of squareness difficult.
    Type: Grant
    Filed: December 28, 1990
    Date of Patent: July 28, 1992
    Assignee: Susan M. Durfee
    Inventor: David L. Durfee, Jr.
  • Patent number: 5129638
    Abstract: The invention is an improvement to machining vises that allows the effective width between the opposing jaw faces to be variably increased beyond that of the standard opposing faces of the stationary and movable jaws. To provide the increased jaw width, jaw segments having a notched reception area are received in key-ways extending laterally across extended upper surfaces of the stationary and movable jaws. At least one key-way is formed on the upper surface of the stationary jaw and at least two key-ways are formed in the upper surface of the movable jaw. The number and placement of the jaw segments are determined by the configuration of the workpiece to be machined so as to properly hold the workpiece in such a manner the machining operation is not obstructed.
    Type: Grant
    Filed: December 26, 1990
    Date of Patent: July 14, 1992
    Assignee: Susan M. Durfee
    Inventor: David L. Durfee, Jr.