JPH0557602U - Micrometer - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a micrometer capable of obtaining stable measurement accuracy while speeding up measurement work. [Structure] Attachment part 11 provided at one end of spindle 5
Then, the ratchet 19 which constitutes the ratchet stop together with the shaft 12, the spring 14, and the claw 15 is fixed to the end portion of the rotating member 16. The rotary member 16 is rotatably attached to the shaft 12 by the screw 22, and the rotary member 16 is externally fitted to the thimble 6. When operating the micrometer 1 with one hand during measurement, the thimble 6 is rotated via the rotating member 16. Further, when the spindle 5 comes into contact with the object to be measured, the rotary member 16 idles.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a micrometer used for length measurement.

[0002]

[Prior Art]

 Conventionally, there is a micrometer shown in FIG. The micrometer 31 is a well-known one used for measuring the outer diameter and has a frame 32. An anvil 33 is fixed to one end of the frame 32, and a tubular sleeve 34 is provided at the other end, and a spindle 35 is internally fitted and screwed into the sleeve 34. The sleeve 34 is fixed to one end side of the spindle 35, and a thimble 36 having a knurled outer peripheral surface on one end side is externally fitted to the sleeve 34. Is equipped with a ratchet stop 37. As shown in FIG. 6, the ratchet stop 37 has a mounting portion 41 at the outer end of the spindle 35, a claw 43 housed in the mounting portion 41 and elastically supported by a spring 42, and rotatably supported by the mounting portion 41. And a ratchet 44 that meshes with the pawl 43.

To operate the micrometer 31 during measurement, first, the thimble 36 is rotated to screw the thimble 36 and the spindle 35, and the object W is held between the anvil 33 and the spindle 35, and then the ratchet 44. It is fundamental to make the measured pressure constant by rotating the. On the other hand, at a work site where parts are machined, when the above-mentioned micrometer 31 is used for dimension measurement of parts (measuring objects) that have been successively machined, in order to perform measurement work quickly, While holding the object to be measured W in his hand and the micrometer 31 in the other hand, operate this. When operating the micrometer 31 with one hand, since the ratchet stop 37 is located at one end of the micrometer 31, the spindle 35 can be moved only by rotating the thimble 36 without using it. The convenient method of performing measurement work is adopted.

[0004]

[Problems to be solved by the device]

 However, in the conventional micrometer 31, it is difficult to keep the measurement pressure constant when only the thimble 36 is rotated, that is, when the measurement work is performed by one-handed operation. There was a variation in measurement accuracy among different measurers. On the other hand, in order to avoid this, if the user holds the frame 32 or the like with one hand and operates the ratchet stop 37 with the other hand, there is a problem that the speed of the measurement work is impeded.

The present invention has been made in view of such problems in the related art, and an object thereof is to provide a micrometer capable of obtaining stable measurement accuracy while speeding up measurement work. To do.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, in a micrometer that moves a spindle together with the rotation of a thimble during a measurement operation, a rotation in which the thimble or the spindle rotates idly when a measured pressure reaches a certain pressure. A member is supported, and the rotating member is fitted on the thimble. Further, it is preferable that the rotating member is supported by the spindle via a ratchet stop provided at one end of the spindle.

[0007]

[Action]

 In the above configuration, when the rotating member is rotated during the measurement work, the spindle is moved, and when the spindle comes into contact with the measurement object and the measurement pressure reaches a constant pressure, the rotation member idles. At this time, since the rotating member is fitted onto the thimble, the measurer can perform the measurement work in the same manner as when rotating the thimble. Also, if the rotating member is supported by the spindle via a ratchet stop provided at one end of the spindle, it is not necessary to separately provide an idling mechanism that idles the rotating member when the measured pressure reaches a certain pressure. ..

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. That is, FIG. 1 is an exploded view of a micrometer 1 according to the present invention. The micrometer 1 includes a frame 2 having the same structure and function as those shown in the conventional example, an anvil 3, a sleeve 4, and a spindle 5. Have Further, a convex portion 7 is formed in a circular ring shape on the outer peripheral surface of the thimble 6 which is fixed to the spindle 5 and which is fitted onto the sleeve 4 approximately at the center in the axial direction. Further, the thimble 6 is divided by the convex portion 7 into a large-diameter portion 8 in which a taper surface is graduated on one end side and a small-diameter portion 9 slightly smaller than this, and the other end of the small-diameter portion 9 is divided. A step portion 10 having a smaller diameter is further formed in the portion, and a mounting portion 11 provided at an end portion of the spindle 5 penetrating the thimble 6 extends at a tip end of the step portion 10. At the center of the end surface of the mounting portion 11, a tubular shaft 12 internally threaded extends, and a hole 13 is opened in the vicinity thereof (see FIG. 2).

Further, the micrometer 1 includes a spring 14 and a claw 15 housed in the hole 13, and a rotating member 16 rotatably fitted to the respective parts 10, 11, 12 on the small diameter part 9 side of the thimble 6. Have As shown in FIG. 3A, the rotating member 16 is fitted onto the small-diameter portion 9 and has a knurled cylindrical portion 17 on its outer peripheral surface, the step portion 10 and the rotating portion 16. The taper portion 18 fitted onto the mounting portion 11 is integrally formed. A ratchet 19 that constitutes a ratchet stop 23 (see FIG. 4) together with the mounting portion 11, the shaft 12, the spring 14, and the pawl 15 is fixed to the end of the tapered portion 18 in advance. As shown in FIG. 3 (b), the ratchet 19 has a hole 20 into which the shaft 12 is inserted, and a plurality of grooves 21 that mesh with the claws 15 are radially formed from the hole 20 on the inner end surface thereof. It is engraved on. The rotating member 16 is rotatably supported on the shaft 12 by a screw 22 via a ratchet 19.

In the above configuration, when the micrometer 1 is used for dimensional inspection of a part at a part processing site, as shown in FIG. 4, the measurer holds the measurement object W in one hand and the other hand in the other hand. When operating the micrometer 1 while holding it, the rotating member 16 is fitted onto the thimble 6, so that the measurer can rotate the thimble 6 in the same manner as in the conventional case. The thimble 6 can be rotated via 16. Then, when the spindle 5 is screwed along with the rotation of the thimble 6 and the spindle 5 comes into contact with the measured object W, the rotating member 16 is fixed to the ratchet 19 that constitutes the ratchet stop 23 as described above. The rotating member 16 idles and the measured pressure becomes constant. Therefore, it is possible to prevent the measurement accuracy from varying for each measured object or for each measurer.

Therefore, in the measurement work, it is possible to obtain a stable measurement accuracy while speeding up the measurement work by operating with only one hand.

On the other hand, in the micrometer 1 of the present embodiment, since the rotating member 16 is supported by the spindle 5 via the ratchet 19, that is, via the ratchet stop 23, as is clear from the figure. For example, it is possible to easily improve the existing micrometer 31 (see FIG. 5) as shown in the conventional example to the micrometer 1 of the present invention. Moreover, in that case, by utilizing the ratchet stop 37 of the existing micrometer 31 as it is, it is not necessary to separately provide an idling mechanism for idling the rotating member 16 when the measured pressure is a constant pressure. Besides, the present invention can be implemented at an extremely low cost.

In this embodiment, the rotary member 16 is supported by the spindle 5 via the ratchet stop 23, and the ratchet stop 23 idles when the measured pressure is constant. Not limited to this, the rotating member 16 may be supported by the thimble 6, and the rotating member 16 may be idled by another idle mechanism such as a friction stop. Needless to say, the rotary member 16 does not need to have a cylindrical shape on the portion fitted onto the shimble 6.

[0014]

As described above, according to the present invention, the thimble or the spindle supports the rotating member that idles when the measured pressure reaches a certain pressure, and the rotating member is fitted onto the thimble. Since the micrometer is used, when the micrometer is operated with one hand during the measurement work, the thimble can be rotated by the rotating member to move the spindle, and moreover, when the spindle and the object to be measured come into contact with each other. The measurement pressure can always be constant. Therefore, it is possible to obtain stable measurement accuracy while speeding up the measurement work by operating with only one hand during the measurement work.

Further, if the rotating member is supported by the spindle through a ratchet stop provided at one end of the spindle, a general existing micrometer having a ratchet stop can be easily provided by the present invention. Can be improved. However, in that case, it is not necessary to separately provide a spinning mechanism for spinning the rotating member when the measured pressure reaches a certain pressure, and the present invention can be implemented at low cost.

[Brief description of drawings]

FIG. 1 is an exploded view showing an embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

3A and 3B are explanatory views of the rotating member and the ratchet shown in FIG. 1, in which FIG. 3A is a vertical sectional view and FIG.

FIG. 4 is a diagram showing a usage pattern when operating the micrometer of FIG. 1 with one hand.

FIG. 5 is an external view showing a conventional example.

6 is an enlarged sectional view of a C part of FIG.

[Explanation of symbols]

 1 Micrometer 5 Spindle 6 Thimble 11 Mounting part (ratchet stop) 12 Axis 14 Spring (ratchet stop) 15 Claw (ratchet stop) 16 Rotating member 19 Ratchet (ratchet stop) 23 Ratchet stop W Measured object

Claims (2)

[Scope of utility model registration request] 1. A micrometer that moves a spindle as the thimble rotates during a measurement operation, wherein the thimble or the spindle supports a rotating member that idles when a measured pressure reaches a certain pressure, and the rotating member is the thimble. A micrometer characterized by being externally fitted to. 2. The micrometer according to claim 1, wherein the rotating member is supported by the spindle via a ratchet stop provided at one end of the spindle.