Twin screw vise

Details Twin screw vise Twin screw vise

1992-08-10

1994-04-12

Watson, Robert C.

Work holders

Relatively movable jaws

Means to actuate jaw

B23Q 104

Patent

active

053019342

ABSTRACT:
A twin screw vise utilizing two threaded vise screw rods that are journaled through flanged nuts fixed to a workbench top or to a rear, fixed bench jaw. The vise screws pass through a movable front jaw and into tee-castings and handles that may be turned to rotate the screws. Sprockets are located on each screw between the tee castings and the front jaw and are coupled by a chain. One of the sprockets is fixed in position on its screw during a calibration procedure. The other sprocket remains free to rotate on its screw, except when a spring loaded pin in the corresponding tee-casting engages a depression in the face of the sprocket, thereby coupling that sprocket to the tee casting and associated screw.

REFERENCES:
patent: 3212 (1843-08-01), Matthews
patent: 293058 (1884-02-01), Moore
patent: 326138 (1885-09-01), Moore
patent: 467781 (1892-01-01), Palm et al.
patent: 515986 (1894-03-01), Barnard
patent: 663145 (1900-12-01), Zwart
patent: 816508 (1906-03-01), Snow
patent: 985857 (1911-03-01), Thomas
patent: 1392434 (1921-10-01), Miller
patent: 3208744 (1965-09-01), Slifer
patent: 4858902 (1989-08-01), Hickman
patent: 4953839 (1990-09-01), Chern
patent: 5048653 (1991-09-01), Fellows
Landis, Scott, The Workbench Book, p. 133 (1987) The Taunton Press Inc.

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