Geometrical instruments – Gauge – Surface plate or gauge block
Patent
1995-09-18
1997-09-16
Fulton, Christopher W.
Geometrical instruments
Gauge
Surface plate or gauge block
33573, G01B 330
Patent
active
056667388
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
This invention relates to measuring and calibration tools and especially to such tools for calibration of for instance slide gages, micrometer calibrators, fixed gages and the like.
BACKGROUND OF THE INVENTION
For calibration purposes there are today a number of different tools the majority of which includes a rod shaped part and a number of projections aligned along the rod wherein reference surfaces are localized on either or both sides of said projections.
There are tools having essentially even pitch between the projections/reference surfaces and such where the distance between the reference surfaces varies according to set patterns. The known devices are adapted for calibration of measuring tools of a certain kind but are normally not utilized for just any measuring devices for instances such for internal measuring.
SUMMARY OF THE INVENTION
One aspect of the invention is to bring about a new type of calibration tool arranged in such a way that it can be used for practically all kinds of calibration or measuring tools and is easy to handle and operate without demanding specified supports.
The background for the invention is a demand for a universally useful calibration tool. It is to be possible to make a calibration in a simple and safe way of practically every kind of measuring devices utilized within the industry and with a minimum of trouble allow also switching between measuring devices shaped in different ways.
The new calibration tool includes a number of rigidly mounted plates separated by spacers or pads and localized one after the other, the majority of the plates having one projection and at least one plate having several, preferably four projections, which plate projections at least on one side has a reference surface facing in a longitudinal direction of the tool. The plates with the projections are fixedly arranged along a common carrier wherein the projections are oriented in such a way that the towards or from each other facing surfaces of two projections aligned with each other define a given distance of calibration. But for the plate or plates having several projections the plates are preferably localized in such a way that the projections essentially follow a helical line along the tool.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the tool according to the invention will be described in the following with reference to attached drawings, in which
FIG. 1 is a sideview showing the calibration tool from one side,
FIG. 2 is another sideview showing a support device for the tool,
FIG. 3 is an axial view of a plate having four projections, and
FIG. 4 is a similar view showing a plate having one projection.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
A calibration tool as unit designated 1 is constructed round and along a central rod, not shown, having threaded ends and on this rod the parts mentioned below are mounted.
At the one end of the rod an end nut 2 is threaded and secured. A support pad 3 is placed against said nut and a first plate 4 having four projections 5 is slid on top thereof.
After the first plate 4 a spacer sleeve 6 having a defined length and a plate 7 with a reference surface projection 5a, and furtheron in turn spacer sleeves 6 and plates 7 with reference surface projections 5b-5k are mounted until the intended number has been reached, whereupon a further pad is mounted and the stack of spacers and plates and sleeves is tightened rigidly by means of an end nut 2 arranged at the opposite end of the rod. During the mounting the rod may be placed between four guiding rods ensuring a correct aligning of the various projections.
The first reference surface plate 4 has projections 5 projecting in all four directions and said projection can have carefully machined reference surfaces R on one or both sides. The single projection 5a of next plate, which projection may have a reference surface R on the one or both sides will be directed in the same direction as one of the four projections of the first plate and the fo
REFERENCES:
patent: 2831256 (1958-04-01), Werle
patent: 2853786 (1958-09-01), Ellstrom, Sr.
patent: 3775858 (1973-12-01), Meyer
Fasth Rolf
Fulton Christopher W.
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