JPH048324Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is used in the technical field of limit gauges and relates to an assembly type limit gauge.

(Prior Art) In general, for mechanical parts that undergo precision finishing, a limit gauge is applied to measure the finished surface of the machine parts to maintain a high level of finishing accuracy. This limit gauge consists of a U-shaped plate-like body with a pair of gauge parts projecting laterally in parallel from the upper and lower ends of the holder part.

(Problem to be solved by the invention) However, while the above-mentioned conventional limit gauges are convenient to handle and transport, it is difficult to straighten the distortion after heat treatment during the manufacturing process, especially when the gauge is formed on a flat surface. Precise polishing of the parts is done by hand, which takes a lot of time and makes mass production difficult.
Further, there was a problem that if the finished product was accidentally dropped, it would be easily deformed.

In view of the above-mentioned conventional problems, the present invention divides the limit gauge into a holder and a pair of gauge members that can be attached to and detached from the holder, and also forms each gauge member into a round shaft shape to facilitate processing. The object of the present invention is to provide an easy-to-assemble limit gauge.

(Means for Solving the Problems) In order to achieve the above object, the solving means of the present invention includes a first hole having a circular cross section and a first hole having a circular cross section, which are spaced apart so that their axes are parallel to each other. A holder having two holes, a shaft portion that can be fitted into the first hole of the holder at the base end, and a large diameter gauge portion with a circular cross section formed coaxially with the shaft portion at the middle portion. a shaft-shaped first gauge member having a small-diameter gauge portion having a circular cross-section and having a smaller diameter than the large-diameter gauge portion and coaxial with the shaft portion at the distal end; and the holder at the base end. has a shaft part that can be fitted into the second hole of the first gauge member, and has a circular cross section formed at the tip part coaxially with the shaft part and located corresponding to the large diameter gauge part and the small diameter gauge part of the first gauge member. and a shaft-shaped second gauge member having a shaped gauge portion.

(Function) As a result, the present invention can be easily assembled by simply fitting the shaft portions of the first and second gauge members into the first and second holes of the holder, respectively.
Furthermore, positioning of each gauge member in the circumferential direction is not necessary.

Further, since the gauge portion of each gauge member can be used at any position in the circumferential direction, if the gauge portion is worn out, the gauge member can be rotated to use a portion that is not worn out.

Moreover, since each gauge member is formed into a shaft shape and has increased rigidity, it is unlikely to be deformed even if it is dropped. Furthermore, since each gauge member is individually heat-treated during manufacturing, not only does the holder not suffer from thermal distortion, but also the measurement surface of each gauge part can be easily polished using a machine tool.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. In FIGS. 1 and 2, reference numeral 1 is an assembly type limit gauge, which is composed of a holder 2 and a first gauge member and a second gauge member 4 that can be attached to and detached from the holder.

The holder 2 includes a first boss 5 and a second boss 6 each having a circular cross section, and a beam 7 connecting the two bosses 5 and 6. The first boss 5 and the second boss 6 have a first tapered hole 8 and a second tapered hole 9, respectively, which have a circular cross section and whose diameter increases in the same direction.
1 and C2 are spaced apart from each other so that they are parallel to each other.

The first gauge member 3 has a tapered shaft portion 1 at its base end that can be fitted into the first tapered hole 8 of the holder 2.
0, a large diameter gauge part 11 coaxial with the tapered shaft part 10 and having a circular cross section is formed in the middle part, and a large diameter gauge part 11 coaxial with the taper shaft part 10 and having a circular cross section is formed in the tip part. It has a shaft shape in which a small diameter gauge portion 12 having a small diameter and a circular cross section is formed.

The second gauge member 4 has a tapered shaft portion 1 at its base end that can fit into the second tapered hole 9 of the holder 2.
3, and a straight gauge part 14 having a circular cross section is formed at the tip thereof, coaxially with the tapered shaft part 13 and located corresponding to the large diameter gauge part 11 and the small diameter gauge part 12 of the first gauge member 3. It is shaft-shaped.

Note that the tapered shaft portion 10 of the first gauge member 3
and the first tapered hole 8, and the fitting accuracy between the tapered shaft portion 13 of the second gauge member 4 and the second tapered hole 9, the relative positions of the fitting surfaces change as the respective fitting surfaces are repeatedly attached and detached. Even in such a case, the parallelism of the axes C1 and C2 of the first gauge member 3 and the second gauge member 4 and the distance D between them are always maintained in an accurate state.

Next, the operation of the above embodiment will be explained.

A When measuring an object to be measured First, the holder 2, the first gauge member 3, and the second
Prepare the gauge member 4, insert the tapered shaft portion 10 of the first gauge member 3 into the first tapered hole 8 of the holder 2,
The tapered shaft portions 13 of the second gauge members 4 are tightly fitted and fixed in the second tapered holes 9 to form the assembled limit gauge 1. Thereafter, the limit gauge 1 is applied to the outer circumferential measurement part of the object W to be measured, and the measurement surfaces of the small diameter gauge part 12 and the straight gauge part 14 are opposed to each other on the street side and the large diameter gauge part 11 and the straight gauge part 14. The acceptance or failure of the critical dimension of the object to be measured W is measured by the end side with the measurement surfaces facing each other.

B. When the gauge parts are worn When the measurement surfaces of the large diameter gauge part 11, the small diameter gauge part 12 of the first gauge member 3, and the straight gauge part 14 of the second gauge member 4 are worn, each of the gauge members 3, 4 All you have to do is rotate it by the required angle to update the lateral plane.

In the above embodiment, the gauge part 14 of the second gauge member 4 is straight, but it is not limited to this, and it is also possible to use a gauge part with a large diameter or a small diameter like the first gauge member 3.

(Effects of the invention) With the above structure, the invention can be easily assembled without requiring positioning of each gauge member, and each gauge member can be continued to be used by rotating even if the gauge part wears out. Moreover, since the shape is axially shaped and the rigidity is increased, it is difficult to deform even if it is dropped.
Furthermore, since each gauge member is heat-treated individually during manufacturing, not only does the holder not suffer from thermal distortion, but the measurement surface of each gauge part can be polished using a machine tool, making it easy to mass-produce. It has excellent effects such as

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a partially cutaway front view of a prefabricated limit gauge, and FIG.
The figure is a view of FIG. 1 viewed from the left side (gauge part side). 1... Assembly type limit gauge, 2... Holder, 3
...First gauge member, 4...Second gauge member, 8
...First tapered hole, 9...Second tapered hole, 10...
... Tapered shaft part, 11 ... Large diameter gauge part, 12 ...
Small diameter gauge part, 13...Tapered shaft part, 14...Straight gauge part, C1, C2... Axis center, D...
interval.

Claims (1)

[Claims for Utility Model Registration] A holder having a first hole and a second hole having a circular cross section and spaced apart so that their axes are parallel to each other; It has a shaft part that can be fitted into the hole, a large diameter gauge part with a circular cross section formed coaxially with the shaft part in the middle part, and a diameter smaller than the large diameter gauge part in the tip part. a shaft-shaped first gauge member having a small-diameter gauge part with a circular cross section formed coaxially with the shaft part; a shaft part that can be fitted into the second hole of the holder at the base end; coaxially with the shaft part and said first
A prefabricated limit gauge comprising: a shaft-shaped second gauge member having a circular cross-section gauge portion formed to correspond to the large-diameter gauge portion and the small-diameter gauge portion of the gauge member.