Geometrical instruments – Gauge – Screw thread
Patent
1988-07-26
1989-08-22
Haroian, Harry N.
Geometrical instruments
Gauge
Screw thread
33178B, G01B 348
Patent
active
048583308
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a thread measuring tool with a "go" plug gauge and a "no go" plug gauge, said gauges being arranged in a housing, and were a plug gauge holder with a measuring value indicator is arranged around the plug gauge, which holder can be inserted telescopically into the housing against a spring.
Thread measuring tools of this type can be used for checking the tolerances of the thread holes while the thread depth can be read direct from a measuring value indicator.
By the hitherto known tools the "go" plug gauge and the "no go" plug gauge are designed at each end of a through-going spindle extending through the housing.
In use these plug gauges can be damaged and they are worn. When one or both plug gauges do no longer meet the requirements in respect of tolerance, shape etc., the whole tool must be discarded or at best be provided with a new spindle with plug gauge.
The replacement of the spindle with plug gauges can normally only take place while at the same time adjusting the measuring value indicator of the tool, because the plug gauge must be flush with the end of the plug gauge holder in order to provide an accurate reading of the thread depth.
Therefore, the tool will normally be discarded when the plug gauges do no longer meet the tolerance requirements, which is a source of considerable disadvantages and expenses for the consumer.
Add to this that a measuring tool for each thread type and thread size must be used. This requires a considerable number of measuring tools which is expensive for the consumer who may only occasionally require thread check.
It is the object of the invenytion to overcome these shortcomings of the known measuring tools, and this is achieved by a tool where the gauges are each situated on a shank which can be attached to a rod extending inside the housing.
Considerable advantages in use and by way of reduced costs are hereby obtained. First of all the replacement of a worn down or damaged gauge is simple and comparatively inexpensive. It will thus suffice to replace only one gauge thereby saving money for the replacement of the other gauge. Add to this that other sizes of plug gauges can be placed in the same tool whereby both the field of tolerance as well as thread types and sizes can be varied within a wide framework within the one and same tool. This provides large practical advantages and reduces the costs considerably.
By being able to attach the shank of the gauges in a bore, a reliable and accurate mounting of the gauge is obtained by a slight conicity.
By, as presented in claim 4, being able to adjust the position of the spindle in the housing, the measuring value indicator of the tool can be adjusted exactly to the plug gauge.
Finally, it is expedient, as presented in claim 5, to adjust by screwing the rod into the housing.
In the following invention will be described in further detail with reference to the drawing, where
FIG. 1 shows the individual parts of the tool,
FIG. 2 shows the assembled tool, and
FIG. 3 is a section through the tool on a larger scale.
The drawing shows an example of a preferred embodiment of the thread measuring tool.
The individual parts, cf. particularly FIG. 1, comprise a through-going spindle 7 being provided with a bore 3, 6, said bores being somewhat pointed towards the bottom for the formation of a tapered guide for the shanks 2, 5 of the plug gauges.
The plug gauge 1 is provided with a cylindrical shank 2, and similarly the "no go" plug gauge 4 is provided with a cylindrical shank 5. By pressing the shank 2, 5 into the tapered bore 3, 6 the gauge is held fixedly and accurately in the spindle 7.
Moreover, the spindle 7 is at one end is provied with an external thread 17 which can vbe screwed into an interacting inside thread in a thread bushing 10 forming the one end of the housing. By means of this thread 17, the spindle 7 can be adjusted in relation to the housing in that the spindle can be screwed in and out. In order to be able to lock the spindle 7 in the housing, a stop screw 9 is screwed into the thread bushi
REFERENCES:
patent: 1459896 (1923-06-01), John
patent: 1654233 (1927-12-01), Bath
patent: 2330453 (1943-09-01), Smith
patent: 2861347 (1958-11-01), Tarnik
patent: 3015892 (1962-01-01), Stuart
patent: 4519144 (1985-05-01), Larsen
IBM Tech. Disc. Bulletin J. F. Straitwell "Thread Depth Measurement" vol. 13 #5 10/70.
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