Measuring and testing – Dynamometers – Responsive to force
Patent
1990-02-20
1992-03-31
Ruehl, Charles A.
Measuring and testing
Dynamometers
Responsive to force
73DIG1, G01L 110
Patent
active
050997017
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a balance and dynamometer. More partiuclarly, this invention relates to a dynamometer having a pair of parallel struts for elastically reducing the input force exerted thereon.
BACKGROUND OF THE INVENTION
A balance and dynamometer may be seen by reference to West German Patent Publication DE Gbm. G 86 33 612.6. In the dynamometer disclosed therein, an elastic parallel guide for reducing the input force being measured is formed from two thicker deflecting springs and two thinner deflecting springs. A single strut is positioned approximately in the center of each of the thinner deflecting springs. Each strut, in turn, supports a wire clamping head thereon. A laterally oscillating wire is clamped between the wire clamping heads. The thicker deflecting springs, thinner deflecting springs, struts and wire clamping heads are fabricated from a single piece of material.
The disadvantage to the dynamometer configuration disclosed in DE Gbm G 86 33 612.6 is each strut which supports a wire clamping head experiences a flexural stress. As a result of this flexural stress, each wire clamping head which is supported by a single strut carries out a pitching motion when an input force to be measured by the dynamometer is introduced. In this manner, each end region of the laterally oscillating wire experiences a flexural stress. The flexural stress may also introduce error into any prior determination of the length of the laterally oscillating wire by causing the upper and lower edges of the laterally oscillating wire to no longer be located exactly above one another.
It is an object of this invention to provide a dynamometer having strut support means which support a wire clamping head thereon such that the aformentioned disadvantages are prevented and the wire clamping heads thereby supported are allowed to shift only in a direction parallel to the head.
SUMMARY OF THE INVENTION
In one aspect, the present invention is of a balance and an elastic, force reducing dynamometer. The dynamometer includes a frame, a central block portion, a first pair of plate springs and a second pair of plate springs. First and second wire clamps are mounted in approximately the center of the first and second plate springs, respectively, which comprise the second pair of plate springs and a laterally osicllating wire is clamped therebetween. A pair of struts are used to mount each of the first and second wire clamps on the first and second plate springs, respectively.
In another aspect, the present invention is of a balance and an elastic, force reducing dynamometer where first, second, third and fourth struts are mounted on the frame of the dynamometer. A first clamping means mounted on the first and second struts clamps one end of a laterally oscillating wire and a second clamping means mounted on the third and fourth struts clamps the other end of the laterally oscillating wire. In alternate embodiments of this aspect of the invention, each of the first, second, third and fourth struts further comprise a straight strut, each of the first and third struts further comprise a straight strut and each of the second and fourth struts further comprise an offset strut, or each of the first, second, third and fourth strust further comprise an offset strut.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention may be better understood, and its numerous features and advantates will be apparent to those skilled in the art, by reference to the accompanying drawings in which:
FIG. 1 is a side view of a prior dynamometer under load;
FIG. 2a is a fragmentary side view of a dynamometer constructed in accordance with the teachings of the present invention;
FIG. 2b illustrates the dynamometer of FIG. 2a under load;
FIG. 3a is a fragmentary side view of a second embodiment of the dynamometer constructed in accordance with the teachings of the present invention;
FIG. 3b illustrates the dynamometer of FIG. 3a under load;
FIG. 4a is a fragmentary side view of a third embodiment of the dynamometer constructed i
REFERENCES:
patent: 3470400 (1969-09-01), Weisbord
patent: 3969934 (1976-07-01), Raskin
patent: 4406966 (1983-09-01), Paros
patent: 4658174 (1987-04-01), Albert
Knusli Max
Wirth Johannes
Ruehl Charles A.
Wirth Gallo Messtechnik AG
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