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| Number | Title | Issue Date |
| 8088328 | Vacuum nitriding furnace A heat treating furnace is disclosed for nitride case hardening and gas cooling a stationary workload in the same furnace which is comprised of a single chamber and an access door. The chamber is segregated into an outer portion and an inner portion, with the inner ... | 01/03/2012 |
| 7514035 | Versatile high velocity integral vacuum furnace Versatile vacuum furnace (also having high internal pressure capability) designed for facilitating directed gas flow has a treating chamber including a long, low profile work zone configuration, and powerful gas recirculation equipment with unique structure supporti... | 04/07/2009 |
| 7490683 | Curb-climbing power wheelchair A mid-wheel drive power wheelchair for use by handicapped and disabled persons is provided having a frame, a seat supported by the frame, a pair of drive wheels supported on the frame under the seat, drive means for causing rotation of the drive wheels, power means ... | 02/17/2009 |
| 7104346 | Power wheelchair A mid-wheel drive power wheelchair for use by handicapped and disabled persons is provided having a frame, a seat supported by the frame, a pair of drive wheels supported on the frame under the seat, a motor for causing rotation of the drive wheels, a battery for su... | 09/12/2006 |
| 6843326 | Method and apparatus for determining when a fastener is tightened to a predetermined tightness by a pulse output tightening tool, and a pulsed output tightening tool incorporating the apparatus An impact wrench (1) comprising an output shaft (5) for receiving a socket or other fastener engaging element for tightening a fastener is powered by a pneumatic motor (11). Apparatus (20) for determining when the fastener has been tighte... | 01/18/2005 |
| 4862718 | Thread rolling dies Short thread rolling dies for forming a thread on a cylindrical body are disclosed comprising a face having a working configuration formed thereon for producing a thread on the cylindrical body with the face comprising a ramp surface inclined upwardly fro... | 09/05/1989 |
| 4846001 | Ultrasonic load indicating member A method of measuring the load in a member subjected to longitudinal stress, a load measuring device and a fastener tightening device using the method of measuring, a load indicating member and a load indicating fastener for use in conjunction with the me... | 07/11/1989 |
| 4842463 | Vibration resistant fasteners A self-locking fastener having a bearing surface comprising a plurality of sets of serrations arranged to penetrate a workpiece such that while a resistance to the loosening of the fastener from the workpiece is created the marring of the workpiece surfac... | 06/27/1989 |
| 4832133 | Tightening system and a method of tightening A method of tightening and a tightening system using the method. The method includes the steps of providing pulse with modulated waveforms from an inverter, driving an AC induction motor by the waveforms in a highspeed low torque mode or a low speed high ... | 05/23/1989 |
| 4832548 | Blind fastener for composite material A blind fastener assembly suitable for use in joint assemblies including advanced composite material workpieces. The blind fastener assembly includes a core pin having an enlarged head, an expander having a head and a tapered nose portion and being mounte... | 05/23/1989 |
| 4829804 | Tooling for crimping eyelet-type inserts A backing fixture is arranged for use with a pull gun to crimp eyelet type inserts under extemporaneous field conditions. When the desired crimping force is less than the force output of the pull gun, the backing fixture is modified with a spring to limit... | 05/16/1989 |
| 4823616 | Torque and angular displacement sensing in yield threshold controlled wrenches The torque and angular displacement transducers in a yield threshold controlled wrench apparatus are relocated to reduce the problems encountered therewith from the harsh physical environment experienced by such transducers in conventional designs. In one... | 04/25/1989 |
| 4807498 | Blind fastener installation tool and modified fastener A blind fastener installation tool as well as a blind fastener and a core bolt for the blind fastener, both being adapted for use with the installation tool. The installation tool has coaxially disposed first and second tool engagement members each engage... | 02/28/1989 |
| 4808050 | Vibration resistant fasteners A self-locking fastener having a bearing surface comprising a plurality of sets of serrations arranged to penetrate a workpiece such that, while a resistance to the loosening of the fastener from the workpiece is created, the marring of the workpiece surf... | 02/28/1989 |
| 4686859 | Load indicating member, apparatus and method A method of measuring the load in a member subjected to longitudinal stress, a load measuring device and a fastener tightening device using the method of measuring, a load indicating member and a load indicating fastener for use in conjunction with the me... | 08/18/1987 |
| 4676109 | Load indicating member, apparatus and method A method of measuring the load in a member subjected to longitudinal stress, a load measuring device and a fastener tightening device using the method of measuring, a load indicating member and a load indicating fastener for use in conjunction with the me... | 06/30/1987 |
| 4391544 | Self-retained fastener A self-retained fastener including locking means provided near the end of the fastener first inserted through a hole in a workpiece wherein the locking means becomes operative after passing beyond the hole in the workpiece. The locking means comprises an ... | 07/05/1983 |
| 4389157 | Retrieval and storage mechanism for use with an automated rotating storage unit In combination with automatic storage and retrieval system having a continuous track which supports a continuous rotating storage unit to move therearound in a horizontal direction, the rotating storage unit including a plurality of horizontally spaced sh... | 06/21/1983 |
| 4375120 | Method and apparatus for tightening threaded fastener assemblies Apparatus and method for tightening assemblies held together by threaded fasteners. The desired tightened condition is achieved by calculating the tightening torque required to induce a desired preload in the threaded fastener and comparing this calculate... | 03/01/1983 |
| 4375122 | Method and apparatus for tightening threaded fastener assemblies Apparatus and method for tightening assemblies held together by threaded fasteners. The desired tightened condition is achieved by calculating the tightening torque required to induce a preload in a fastener equal to or approximating a predetermined prelo... | 03/01/1983 |
| 4375121 | Dynamic friction indicator and tightening system usable therewith Apparatus and method for determining dynamic friction in a threaded joint and an associated tightening system for tightening such joints including threaded fasteners. A value representative of the coefficient of friction in the threaded joint is obtained ... | 03/01/1983 |
| 4375123 | Method and apparatus for tightening threaded fastener assemblies Apparatus and method for tightening assemblies held together by threaded fasteners. Prior to tightening, the gradients of a selected number of possible torque-rotation curves for the assembly are established and stored along with the associated tightening... | 03/01/1983 |
| 4364697 | Blind fastener assembly A pull-type blind fastener assembly includes a mandrel, expander, sleeve and lock collar. The expander extends through aligned holes in at least two workpieces, that are to be joined and has an enlarged head and a shank portion with a pair of conical tape... | 12/21/1982 |
| 4358735 | Bidirectional incremental encoding system for measuring maximum forward angular displacement of a bidirectionally rotatable rotating shaft An impact wrench having an adaptive control system for determining the yield point or some similarly significant point of a fastener assembly by detecting a signal representative of the peak deceleration of the hammer, one embodiment of which is the peak ... | 11/09/1982 |
| 4344216 | Apparatus and method for tightening an assembly Apparatus and method for tightening assemblies held together by threaded fasteners. The desired tightened condition is achieved by turning the threaded fastener through a precise tightening angle required to induce a predetermined preload in the threaded ... | 08/17/1982 |
| 4333220 | Method and apparatus for tightening an assembly including a pre-load indicating fastener A method and apparatus for tightening an assembly including a pre-load indicating fastener is disclosed. Pre-load indicating fasteners are generally tightened until a crushable element, forming a portion of the pre-load indicating fastener, is plastically... | 06/08/1982 |
| 4328871 | Power tool speed and torque control mechanism A power tool speed and torque control mechanism is disclosed. An improved clutch assembly is provided for power tools of the type having a high speed/low torque mode for rapidly engaging a threaded fastener and a low speed/high torque mode for tightening ... | 05/11/1982 |
| 4324517 | Panel fastener assembly with retainer ring A quick-acting panel fastener assembly for joining a panel to a sub-structure is disclosed. The fastener assembly includes a sleeve bolt, a grommet assembly which is attached to the panel and a receptacle assembly which is attached to the sub-structure. T... | 04/13/1982 |
| 4316512 | Impact wrench A self-contained impact wrench having an adaptive control system for determining the yield point or some similarly significant tightened condition of a fastener assembly by detecting a signal representative of the forward rotation angle of the fastener as... | 02/23/1982 |
| 4295189 | Apparatus and method for generating waveforms which are particularly suitable for a PWM-driven motor A triangle waveform having substantially linearly sloped, gradually increasing and decreasing edges and having a frequency nf is generated from an n-phase sine wave signal, each phase having a fundamental frequency f. A segment of any of the n-phases of t... | 10/13/1981 |
| 4233879 | Grooved fastener A fastener which includes an unthreaded bolt member having two groups of grooves formed therein is disclosed. All the grooves within each group have the same depth. The group of grooves furthest from the workpiece have a greater depth than the group of gr... | 11/18/1980 |
| 4229875 | Method of prestressing bolts A fatigue resistant bolt, and method for making same, is disclosed. Bolts which are tightened to very high loads and are subjected to a dynamic environment are particularly subject to fatigue failure. It has been found that a bolt with fatigue resistant p... | 10/28/1980 |
| 4226127 | Hand operated yield tightening system A hand operated tightening system for tightening a fastener assembly to its yield point is disclosed. The system includes a wrench for applying torque to a threaded fastener and means for mechanically differentiating the magnitude of torque applied with r... | 10/07/1980 |
| 4223632 | Apparatus for making self-locking fasteners with a pressure rolled thermoplastic patch A self-locking threaded fastener of the type having a resilient thermoplastic resin patch bonded to the thread surface and a method and apparatus for making such fasteners are disclosed. The fastener is heated to a temperature in excess of the plastic mel... | 09/23/1980 |
| 4211120 | Tightening apparatus The preferred embodiment of the invention disclosed in this application includes a wrench, for example an operator powered wrench, for tightening a fastener assembly by the incremental application of tightening force. Also included is a control circuit fo... | 07/08/1980 |
| 4185701 | Tightening apparatus An impact wrench having an adaptive control system for determining the yield point or some similarly significant point of a fastener assembly by detecting a signal representative of the peak deceleration of the hammer, one embodiment of which is the peak ... | 01/29/1980 |
| 4168650 | Blind fastener A blind fastener assembly includes a pin, an expander and a sleeve. The pin and expander may include, in one configuration, mating threads for drawing the sleeve axially over the expander toward the blind side of a workpiece, or the pin may be a pull-type... | 09/25/1979 |
| 4163310 | Tightening system A tightening and control system is disclosed for automatically tightening a fastener to a predetermined tightened condition in a workpiece, where the fastener is of the type which exhibits more than one installation region on a graph of two tightening cha... | 08/07/1979 |
| 4163311 | Tightening system for blind fasteners A tightening and control system is disclosed for automatically tightening a blind fastener assembly to a desired tightened condition in a workpiece, where the assembly is of the type which exhibits more than one installation region on a graph of two tight... | 08/07/1979 |
| 4142439 | Blind fastener assembly A blind fastener assembly includes a pin, an expander and a sleeve. The pin and expander may include, in one configuration, mating threads for drawing the sleeve axially over the expander toward the blind side of a workpiece, or the pin may be a pull-type... | 03/06/1979 |
