US Patent: 432,543
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| Automatic Clamp
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Patentee:
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| Thomas Elwood Moon (exact or similar names) - Sabina, OH |
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Patent Dates:
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| Applied: |
Feb. 12, 1890 |
| Granted: |
Jul. 22, 1890 |
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Patent Pictures:
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Joel Havens
Martin J. Donnelly Antique Tools
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Description: |
| Butterworth, Hall & Brown - patent attorneys
My invention consists in the improved form of automatic clamp to be used preferably in wood working, such as will be hereinafter more particularly described and claimed. In planing boards and blocks and similar operations in wood-working much time is lost by the frequent changes which have to be made in the position of the board or block in the vise or clamp in which it is held'. Every time that a block which has to be planed on more than one side is turned and every time a long board or piece of work is fed up through the device the clamp or vise has to be opened and then closed again. To obviate this it has been proposed to employ a spring-actuated automatic clamp which shall hold the piece of work in place, but which may be readily opened for a readjustment of the same. The difficulty with clamps of this order has been that while the clamp could be so constructed as to bind the work of a certain thickness and effectually prevent its being forced through the clamp by the action of the cutting-tool, yet when a little larger piece was introduced the jaws were forced open at an angle, so that they would not bind the work-piece and it would slip. If in the effort to overcome this the actuating spring was made of sufficient power to hold the work in all positions, then it became inconvenient to operate the oscillating jaw. |
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