Patents Assigned to Hartwell Corporation
  • Patent number: 4961329
    Abstract: A protective padlock hasp for receipt of a range of padlocks having different length shackles for connecting adjacent parts together. The device includes a pair of mounting plates having formed integrally therewith one or more protective plates which are arranged to be disposed in confronting relationship with the shackle and are carried from the mounting plate by means of an intermediate web formed with openings for receipt therethrough of the opposite legs of the shackle. The dimensions of the shield plate is such that it extends downwardly to the body of the padlock and upwardly to the level of the closed horseshoe shaped end of the shackle to thus block access to such shackle by bolt cutters or the like. One or more spacer devices are provided for nesting against one of the mounting plates and are formed with a spacer leg to be disposed under the web and project downwardly into butting engagement with the top of the padlock body to block travel thereof upwardly toward the web.
    Type: Grant
    Filed: September 15, 1989
    Date of Patent: October 9, 1990
    Assignee: The Hartwell Corporation
    Inventor: John P. Anderson
  • Patent number: 4949560
    Abstract: A shackle protective padlock mount for use with a conventional padlock having a shackle of inverted U-shape with oppositely located legs. The mount includes a pair of shackle receivers adapted for attachment to the structures which are to be locked together. The receivers have openings for receiving the shackle. The receivers are constrained from moving apart by integral tabs which extend laterally outwardly of the respective receivers. The tabs are adapted to engage the oppositely located shackle legs to prevent separation of the receivers and deny access to the shackle by cutting tools or the like. The receivers are adapted to accommodate different sizes of shackles.
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: August 21, 1990
    Assignee: The Hartwell Corporation
    Inventor: John P. Anderson
  • Patent number: 4914783
    Abstract: A sliding hinge for mounting a nose cone or cover on a nacelle or housing, such as an equipment package suspended from the wing of an aircraft. Typically two hinges are used, positioned at opposite sides of the housing, for pivoting the nose cone upward to provide access to the equipment within the housing. Each hinge includes a sleeve mounted in the housing, a slide block sliding in the sleeve, and a slide arm pivotally attached to the slide block and mounted in the nose. To open the package, the nose is initially slid forward from the housing and then pivoted to an upward position. During this operation the slide arm slides out of the sleeve from a retracted position to an extended position and then pivots upward to the open position, with the slide block remaining in the sleeve.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: April 10, 1990
    Assignee: The Hartwell Corporation
    Inventors: Frank T. Jackson, Bernard W. Henrichs
  • Patent number: 4911486
    Abstract: A tamper proof slide bolt locking apparatus having a mounting plate which mounts a slide bolt. The plate is attachable to movable structure such as a garage door, and a portion extends outwardly from the door. A hasp fixed to the slide bolt extends downwardly and then outwardly from the door in overlying relation to the outwardly extending portion of the plate. The outwardly extending portions of the plate and hasp include shackle openings for locking them against relative movement. The front margins of the plate and hasp are downwardly and upwardly directed, respectively, to overlie and protect vulnerable portions of the padlock shackle.
    Type: Grant
    Filed: August 14, 1989
    Date of Patent: March 27, 1990
    Assignee: The Hartwell Corporation
    Inventor: John P. Anderson
  • Patent number: 4911485
    Abstract: A latching structure defined by a mount, a handle pivotally mounted to the mount and linked with a latch pin slidably mounted in the mount. The linkage between the handle and the latch pin includes first parallel links pivotally mounted to the handle and pivotally mounted to the latch pin. Second links are pivotally mounted to the first links and to a spring block slidably mounted on the latch pin. A spring is placed in compression between a shoulder on the latch pin and the spring blocks. Consequently, the linkage mechanism operates to actuate the latch pin with the handle and create an overcenter mechanism to bias the entire mechanism to either a fully opened position or a fully closed position. A gasket is provided on a flange associated with the handle to seal the latch mechanism when the mechanism is strongly biased by the spring into the closed position.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: March 27, 1990
    Assignee: The Hartwell Corporation
    Inventor: Michael D. Wasilewski
  • Patent number: 4906036
    Abstract: A pivoting adjustment screw for mounting the bolt of a latch to provide vibrational damping along with increasing preload as the contact point of the adjustment screw to the mating structure shifts in a shock or vibrational environment. The adjustment screw includes a pivoting portion which permits the screw to pivot which allows a rotating rather than a scraping or abrading movement in response to the relative movement between the elements being connected.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: March 6, 1990
    Assignee: The Hartwell Corporation
    Inventor: Darrell L. James
  • Patent number: 4902051
    Abstract: A rod end lock for latching heavy objects. The rod end lock has a barrel with a mounting end and a latch end. The latch end has a bite portion such that a keeper is secured at a location centered about the axis of the barrel. The mounting end is coaxial with the barrel and has the same centerline. A locking element is movably connected to the barrel and is biased in a closed position such that the locking element and the bite portion form an enclosed space therebetween for latching the keeper. The keeper is released by actuating the locking element to the open position thereby overcoming the bias to the closed position.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: February 20, 1990
    Assignee: The Hartwell Corporation
    Inventor: L. Richard Poe
  • Patent number: 4877274
    Abstract: A latch handle assembly for securing a latch having a trigger pin includes a handle pivotally joined to the latch. A trigger latch is pivotally joined to the handle and includes an opening engageable onto the trigger pin. A cam is pivotally joined to the handle and is engageable onto the trigger pin to compensate for any clearances between the parts, and thereby prevent chattering and excessive wear within the handle assembly due to vibration.
    Type: Grant
    Filed: September 2, 1987
    Date of Patent: October 31, 1989
    Assignee: The Hartwell Corporation
    Inventor: L. Richard Poe
  • Patent number: 4828299
    Abstract: Latch mechanisms for latching two bodies in both tension and shear. A longitudinally extending latching bolt is associated with a latching assembly having an overcenter link mechanism controlled by a lever. The overcenter link mechanism includes a slot cooperating with a pin to provide two effective lengths to the fully extended linkage. A laterally extending notch provides a shoulder intermediate the ends of the slot to receive the pin. A keeper is slidably associated with a keeper assembly to engage the longitudinally extending bolt to prevent its withdrawal from the keeper assembly. Inclined surfaces between the latching bolt and the keeper function to engage or disengage the spring biased keeper with movement of the latching bolt in a preselected direction.
    Type: Grant
    Filed: March 31, 1987
    Date of Patent: May 9, 1989
    Assignee: Hartwell Corporation
    Inventor: L. Richard Poe
  • Patent number: 4826221
    Abstract: Latch mechanisms for latching two bodies in both tension and shear. A longitudinally extending latching bolt is associated with a latching assembly having an overcenter link mechanism controlled by a lever. The overcenter link mechanism includes a slot cooperating with a pin to provide two effective lengths to the fully extended linkage. A laterally extending notch provides a shoulder intermediate the ends of the slot to receive the pin. A keeper is slidably associated with a keeper assembly to engage a recess in the longitudinally extending bolt to prevent its withdrawal from the keeper assembly. A locking surface in the recess engages the keeper. A slide member may extend over the recess so that the keeper is selectively prevented from engaging the recess for purposes of retracting the bolt.
    Type: Grant
    Filed: April 3, 1987
    Date of Patent: May 2, 1989
    Assignee: Hartwell Corporation
    Inventor: Raymond E. Harmon
  • Patent number: 4819300
    Abstract: A strut assembly having first and second sections pivotally linked together. An overlying sleeve is extendable to lock the sections together in the extended position and retractable to allow folding of the sections relative to one another. A member is arranged at the joint between sections and biased to extend outwardly into interference with the path of extension of the sleeve. A link linking the first and second sections cooperates with the member to retract same when the strut assembly is collapsed in order that the sleeve will automatically lock the sections together when the assembly is again extended.
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: April 11, 1989
    Assignee: Hartwell Corporation
    Inventor: Frank T. Jackson
  • Patent number: 4786225
    Abstract: A fastener for securing two objects or structures together in a predetermined relationship. The fastener has a fastener body including a spacer which defines a predetermined distance between the two objects. A first locking element is attached to one side of the spacer and a second locking element is attached to the other side of the spacer. The fastener body is adapted to receive a plunger which when actuated will cause the locking elements to secure the first object and second object a predetermined distance apart.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: November 22, 1988
    Assignee: Hartwell Corporation
    Inventors: L. Richard Poe, Raymond E. Harmon
  • Patent number: 4759574
    Abstract: A latch assembly includes a hook having an opening engageable to a keeper. A side plate having a straight slot and an angle slot is mounted to the hook via posts. A spring is provided to bias the plate so that it partially overlaps the opening. The plate prevents a latch handle from being moved into its closed position unless the hook is fully engaged onto a keeper.
    Type: Grant
    Filed: July 15, 1987
    Date of Patent: July 26, 1988
    Assignee: Hartwell Corporation
    Inventor: Darrell L. James
  • Patent number: 4752091
    Abstract: A latch mechanism with a self-latching feature comprising a pin slideably mounted to one body and a handle pivotally mounted to a second body having a latching portion thereon for engagement with the pin. A cam member is positioned to pivot the handle to a disengaged position under action of the pin.
    Type: Grant
    Filed: December 10, 1986
    Date of Patent: June 21, 1988
    Assignee: Hartwell Corporation
    Inventor: Frank T. Jackson
  • Patent number: 4683614
    Abstract: A slide hinge for pivotally mounting two bodies includes a curved channel disposed in a housing and a beam member slideably disposed in the channel. The housing is mounted to one of the bodies and the beam member is mounted to the other body. As the beam member slides in the channel, the hinged bodies pivot with respect to each other.
    Type: Grant
    Filed: January 22, 1986
    Date of Patent: August 4, 1987
    Assignee: Hartwell Corporation
    Inventor: John P. Anderson
  • Patent number: 4674930
    Abstract: A fastener for securing two objects or structures together in a predetermined relationship. The fastener has a fastener body including a spacer which defines a predetermined distance between the two objects. A first locking element is attached to one side of the spacer and a second locking element is attached to the other side of the spacer. The fastener body is adapted to receive a plunger which when actuated will cause the locking elements to secure the first object and second object a predetermined distance apart.
    Type: Grant
    Filed: March 23, 1983
    Date of Patent: June 23, 1987
    Assignee: Hartwell Corporation
    Inventors: L. Richard Poe, Raymond E. Harmon
  • Patent number: 4602812
    Abstract: A double hook latch includes a hook assembly, and means for adjusting the position of the hook assembly relative to a keeper arm. Each hook is mounted to independently rotate and the hook assembly can pivot to accommodate misalignment of a keeper arm.
    Type: Grant
    Filed: May 20, 1983
    Date of Patent: July 29, 1986
    Assignee: Hartwell Corporation
    Inventor: William R. Bourne
  • Patent number: 4570290
    Abstract: A quick release hinge/latch for removably attaching two surfaces including a keeper adapted to attach to a surface and having an edge portion in the form of a hollow keeper tube, a housing adapted to attach to another adjacent surface and also having an edge portion in the form of a hollow housing tube such that the keeper tube and housing tube fit together to form an extended tube, a pin which slides within the extended tube to detachably connect the keeper and housing and a flat spring/actuator which attaches to the pin through an opening in the housing tube. The spring/actuator when in a first position holds the pin partially extended into the keeper tube. When the leg portions of the spring/actuator are pinched together and into a second position the pin is withdrawn from the keeper tube.
    Type: Grant
    Filed: December 14, 1984
    Date of Patent: February 18, 1986
    Assignee: Hartwell Corporation
    Inventor: John P. Anderson
  • Patent number: 4548435
    Abstract: A latch assembly wherein a latch bolt and a latch trigger are unlatched by rotation of a sleeve adjacent the latch trigger which causes the latch trigger to pivot out of engagement with the latch bolt.
    Type: Grant
    Filed: April 4, 1980
    Date of Patent: October 22, 1985
    Assignee: Hartwell Corporation
    Inventor: William R. Bourne
  • Patent number: 4530529
    Abstract: An externally accessible adjuster and latch having a biasing means such as a leaf spring for preventing inadvertent rotation of the adjuster.
    Type: Grant
    Filed: May 7, 1982
    Date of Patent: July 23, 1985
    Assignee: Hartwell Corporation
    Inventors: Lloyd R. Poe, Bernard W. Henrichs