Abstract: A toggle clamp comprises a compression spindle assembly with a plunger and a spindle. The plunger has a chamber dimensioned to slidingly receive the spindle in a telescoping arrangement, and a resilient member disposed in the plunger chamber to urge the spindle away from the plunger chamber. A screw extends through a bore of the spindle and the plunger chamber and is threaded into the plunger to bias the resilient member and maintain the spindle in sliding contact with the plunger chamber. The screw has a head abutting a shoulder monolithically formed in the spindle bore. The screw is rotatable to adjust a level of compression of the resilient member. The compression spindle assembly reliably applies a gradual rate of pressure as the compression spindle assembly is compressed.

Abstract: A toggle clamp comprises a compression spindle assembly with a plunger and a spindle. The plunger has a chamber dimensioned to slidingly receive the spindle in a telescoping arrangement, and a resilient member disposed in the plunger chamber to urge the spindle away from the plunger chamber. A screw extends through a bore of the spindle and the plunger chamber and is threaded into the plunger to bias the resilient member and maintain the spindle in sliding contact with the plunger chamber. The screw has a head abutting a shoulder monolithically formed in the spindle bore. The screw is rotatable to adjust a level of compression of the resilient member. The compression spindle assembly reliably applies a gradual rate of pressure as the compression spindle assembly is compressed.

Abstract: A compression spindle for use in a clamp for holding a work piece has a plunger with a bore that defines a seat for a spring. A spindle is inserted into the bore against the spring. A retainer screw holds the spindle in restrained, sliding engagement with the plunger, and allows the spring compression to be adjusted. The spring is completely encapsulated within the compression spindle assembly. When installed in a clamp or press, the compression spindle mediates application of holding pressure on a work piece, and reliably holds work pieces of varying dimensions without adjustment of the clamp.