| 摘要 |
An improved bar clamp in which the first jaw assembly consists of a handle assembly or setting unit, on a slide bar inside of an independently mounted first jaw. A finger lever is pivotably attached to the setting unit and at its upper end pivotably attached to the first jaw. A braking lever is included in the first jaw, and a driving lever in the setting unit. Upon first movement of the finger lever a spring forces the driving lever into firm contact with the slide bar, preventing movement of the first jaw away from the second jaw. The finger lever has no further contact with the driving lever, but upon further movement, acts indirectly on the driving lever via the handle assembly to draw the slide bar and the second jaw towards the first jaw. Releasing the finger lever draws the handle unit forward for the next cycle. Release of the braking lever in the first jaw allows movement away from the second jaw. Close proximity of the two pivots gives increased leverage over conventional designs, achieving practical clamping pressure with less effort as well as greater holding power when maximum grip is applied. An improved second jaw, consisting of a body, molded in two opposing sections, and including a braking lever and a spring to bias it into full contact with the slide bar. The self-aligning part holding the pad bears against a spring, and after firm contact with a workpiece the second jaw and the slide bar continue to be drawn toward the first jaw, stressing the spring. The spring minimizes the loss when the finger lever is released and the clamping force is transferred to the braking lever in the first jaw.
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