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| Number | Title | Issue Date |
| 4081037 | Control system for a multiple spindle machine This disclosure deals with a machine for simultaneously tightening a plurality of threaded fasteners. The machine includes a plurality of torque applying units, one for each fastener, which engage and torque the fasteners. Each unit includes a spindle whi... | 03/28/1978 |
| 4074772 | Torquing tool control circuit The control circuit receives a signal from a torque measuring device provided on the tool and determines the proper shut off point for the tool. The circuit controls not only the tool shut off but also the rate of application of torque by employing a puls... | 02/21/1978 |
| 4066133 | Power hand tool To prevent accidents due to high torque of hand tools, such as drills, and the like, which, when the tool bit stalls, may tend to twist the tool handle from the user's hand, a torque measuring element is located on the tool body at the junction of the too... | 01/03/1978 |
| 4023406 | Tightening system with torque-time control The invention disclosed herein relates to a tightening system including a wrench for applying torque to a fastener system. Associated with the wrench is a control system including measuring means for developing a first signal representative of the torque ... | 05/17/1977 |
| 4016938 | Method for fastener tensioning A fastener tensioning system for use with torque producing power tools, such as, nut runners or the like. The system includes apparatus to rotate the fastener and determine when the fastener has been driven to its yield point in tension, and, thereafter, ... | 04/12/1977 |
| 4006784 | Fluid operated power tool A pneumatic power tool having a torque sensing control system is disclosd which is capable of consistently applying a precise torque to a fastener so that uniform tightening of any number of fasteners can be obtained. A torsional strain responsive transdu... | 02/08/1977 |
| 3975954 | Method and apparatus for evaluating torquing operations To evaluate the quality of a torquing operation wherein a tool engages a workpiece and exerts a rotational driving force on the workpiece until a predetermined maximum torque is attained between the workpiece and the tool, the time during that torquing op... | 08/24/1976 |
| 3974685 | Tightening system and method A tightening system and method and a fastener assembly usable therewith are disclosed in this specification. According to the method a fastener assembly is provided that causes a change in the slope of the torque-rotation curve which could be plotted whil... | 08/17/1976 |
| 3939920 | Tightening method and system A tightening method and system for practicing same are disclosed herein for tightening a fastener to a desired axial load. According to the method, torque is applied to the fastener until it is tightened to its yield point and either the torque applied at... | 02/24/1976 |
