Work holders – Relatively movable jaws – Means to actuate jaw
Patent
1985-12-05
1988-12-27
Olszewski, Robert P.
Work holders
Relatively movable jaws
Means to actuate jaw
269391, 269303, 269317, B25B 100
Patent
active
047936037
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a lateral pressure pad for positioning workpieces on a support provided with one or more stops, employing resilient pressure means with a retaining pin partially enclosed in a housing and embedable with the housing in an aperture of the support.
Lateral pressure pads of the above-described type are known from the prior German patent No. 2,503,246 for example. In these lateral pressure pads the retaining pin is embedded in a resilient material and thus retained resiliently, that is to say that when it is moved out of its normal position by the exertion of a correspondingly strong force, it tends to return into this normal position.
A workpiece which is clamped between two stops and this lateral pressure pad, for example, is consequently retained by this lateral pressure pad with a force which is a function of the resilience of the resilient material used on the one hands and of the degree of the deflection of the retaining pin out of its normal position by the workpiece on the other hand.
These lateral pressure pads are excellently suited for the short-term fastening of workpieces.
However, disadvantages, which are due to a permanent deformation of the elastomer material, arise in the case of long-term use.
In fact, if a workpiece is anchored for a prolonged period in the case of such a known lateral pressure pad, then a permanent deformation of the elastomer material occurs, with the result that the retaining pin no longer returns completely into its original position after the workpiece is released.
SUMMARY OF THE INVENTION
The object of the present invention is to overcome this disadvantage and to develop a lateral pressure pad of the type initially defined which is suitable for both the short-term and the long-term fastening of workpieces on a support.
This object is achieved with a lateral pressure pad for positioning workpieces on a support provided with one or more stops, employing resilient pressure means with a retaining pin partially enclosed in a circular housing and insertable with the housing in an aperture of the support, wherein the retaining pin is provided with a flange abutting the housing wall and is pressed with its flange against the inwardly angled housing rim by a compression spring arranged in the housing between housing bottom and flange.
In the case of a lateral pressure pad according to the invention defined in the above terms, the retaining pin is deflectable in every direction out of its normal position, and the flange is moved out of its normal position with it counter to the spring force. This means that the spring force tends to press the flange back into its normal position and therefore also simultaneously to restore the retaining pin into its normal position.
This restoring force is then generated by the compression spring, which is arranged between housing bottom and flange. The stronger the spring force of this compression spring is, the greater is the restoring force with which the retaining pin ultimately tends to return into its normal position.
Compared to the known lateral pressure pad described initially, the lateral pressure pad according to the invention is distinguished, due to the use of a customary compression spring, by a substantially greater insensitivity to material fatigue, it therefore has a virtually unlimited static and dynamic load capacity. Moreover, the compression spring permits longer spring strokes than the elastomer material used in the known lateral pressure pads; therefore substantially greater tolerances in the workpieces to be fastened can be compensated with the lateral pressure pad according to the invention.
Furthermore, the lateral pressure pads according to the invention are distinguished by greater resistance to thermal effects and chemicals, particularly all types of solvents, and they are also virtually insensitive to corrosion if stainless spring steel is used for the compression spring.
It has been found to be particularly advantageous if, in the lateral pressure pad accordin
REFERENCES:
patent: 477098 (1892-06-01), Brown et al.
patent: 2005161 (1935-06-01), Petersen
patent: 2955820 (1960-10-01), Berg
Petroci Stanko
Reis Dieter
Wober Ralf
Hartman Judy J.
Olszewski Robert P.
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