JPH074483Y2 - Calipers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a caliper, and more particularly to improvement of a measuring jaw portion.

[Background technology]

A large-scale caliper having a long main scale is widely used as a device for measuring an object to be measured, for example, dimensions of relatively large parts such as an aircraft, a railroad vehicle, and an automobile.

Generally, this type of caliper includes a metal main scale for holding a main scale, a first jaw fixed to the main scale, and a second jaw slidable on the main scale. Composed of.

To make measurements using such calipers, do the following.

That is, the measured object is located between the first and second jaws, the second jaw is brought into contact with the measured object, and the displacement amount between the second jaw and the main scale is measured, The dimensions etc. are measured.

However, since the main scale of this caliper is made entirely of metal, the caliper is heavy and has poor workability and handleability.

Therefore, in order to solve this problem, the applicant of the present application has proposed a material in which the material of the main scale is formed of a light weight carbon fiber reinforced plastic, as Japanese Utility Model Publication No. 1-162607.

[Problems to be solved by the device]

As described above, by converting the main scale into a plastic, the problems of weight reduction and improvement of handleability are solved, but other problems existing in a large caliper have not been solved.

That is, the second jaw that slides due to the increase in the size of the caliper is also increased in size. Therefore, when the second jaw is brought into contact with the object to be measured when measuring the object to be measured with this caliper, the impact is applied to the object to be measured. Due to the magnitude of this impact, there is a variation in measurement accuracy, which causes a problem that a measurement error increases. This is also the case with small calipers, but it is a significant problem especially with large calipers.

In order to solve the problem caused by this shock, a caliper for operating a slidable measuring jaw is attached to the measuring jaw via an elastic member, and the elastic member absorbs the shock generated at the time of measurement ( No. 61-158812) is proposed.

However, in such a caliper, the elastic member is deformed in an unreasonable direction due to various forces such as compression force and extension force applied to the finger, so that the elastic member is easily damaged, and the impact absorbing function of the elastic member is exerted. Can not be maintained for a long time,
There is a problem that it is not durable.

An object of the present invention is to provide a caliper that can reduce the impact applied to an object to be measured during measurement and has good durability.

[Means for Solving the Problems]

The present invention is provided with a pair of measuring jaws attached to the main scale, at least one of the pair of measuring jaws is slidable with respect to the main scale, and an object to be measured is contacted between the pair of measuring jaws. In the vernier calipers whose dimensions and the like are to be measured, a finger rest for operating the measurement jaw is slid along the sliding direction of the measurement jaw on one of the measurement jaws slidable on the main scale. A guide support portion that freely guides and supports, and is interposed between the finger rest and the measurement jaw,
A shock absorbing unit having a leaf spring which is an elastic member elastically deformed by sliding with the finger is provided, and the finger is covered with an L-shaped cross section that intersects the sliding direction. A box-shaped body having a substantially U-shaped cross section having a substantially flat plate-shaped lid body that closes the opening side of the cover, and the guide support portions are provided on mutually facing surfaces of the finger rest cover and the lid body. A pair of grooves extending in the sliding direction and a section T fixed to the slidable measuring jaw side.
The head of a letter-shaped plate guide is fitted to each other, and the leaf spring is entirely housed inside the finger rest, one end of which is fixed to the plate guide and the other end of which is the finger rest. It is characterized in that it is mounted on the finger rest by a spacer inserted into a recess provided inside and fitted into the recess.

[Action]

The measurement using the caliper according to the present invention is the same as the conventional one. However, in the present invention, when the slidable measuring jaw comes into contact with the object to be measured during measurement, the shock is absorbed by the shock absorbing means and is not applied to the object to be measured. For this reason, accurate measurement can always be performed at a constant pressure, and precise measurement is possible.

Also, as a guide support part that slidably supports the finger rest,
Since the groove extending in the sliding direction of the measuring jaw and the head of the plate guide having a substantially T-shaped cross section are fitted together, the moving direction of the finger is limited to the direction along the sliding direction of the measuring jaw. Therefore, the leaf spring is prevented from being deformed in an unreasonable direction without being applied with a force for crushing or twisting the leaf spring.

Further, since the elastic member is a leaf spring, one end of this leaf spring is fixed to the measuring jaw side, and the other end is inserted between the finger-holding concave portion and the spacer, so that the leaf-hold even if the finger-hold is moved. The spring is not pulled strongly, the leaf spring is not subjected to excessive tension, and smooth sliding on the fingers is secured.

In addition, since the fingers are box-shaped and the leaf springs are stored inside, the leaf springs are not exposed to the outside, the appearance and usability of the caliper are improved, and the leaf spring is prevented from falling accidents of calipers. Protected and these achieve the above objectives.

〔Example〕

Next, preferred embodiments of a caliper according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 1 and 2 showing the overall configuration, reference numeral 1
Shows a caliper according to the present embodiment. This caliper 1 is a long main scale 10 and a pair sliding on the main scale 10 in the direction of arrow A, that is, the first and second measuring jaws 20 and It has 30 and.

The first measuring jaw 20 is always fixed to a predetermined position of the main scale 10 by two fixing screws 21. On the other hand, the second measuring jaw 30 is normally slidable on the main scale 10 and is fixed to the main scale 10 by a set screw 31 if necessary.

The main scale 10 includes a support member 11 made of fiber reinforced plastic (FRP), for example, carbon fiber reinforced plastic (CFRP).

As shown in FIGS. 3 and 4, the supporting member 11 is provided with a groove 12 over the entire length in the longitudinal direction, and the scale base made of a metal plate such as stainless steel is provided in the groove 12.
13 is attached via screws 14.

Between the scale base 13 and the main scale 10, by appropriately setting the length of the central stepped portion of the screw 14, 0.02 ~ 0.04
Clearance of mm is formed. As a result, the scale base 13 can extend and contract with respect to the main scale 10 in the arrow A direction.

A main scale 15 of capacitance type or the like is attached on the scale base 13. Further, stoppers 16 and 17 for preventing the first and second measuring jaws 20 and 30 from coming off are attached to both ends of the main body 11.

The first measuring jaw 20 is provided with a sliding portion 22 that slides on the main scale 10. The fixing screw 21 is provided on the sliding portion 22, and a jaw base portion 23 made of plastic or the like is fixed to the sliding portion 22. ing. A measuring unit 24 made of metal, for example, stainless steel is fixed to the jaw base 23 by adhesion or detachably provided by screwing. If the measuring section 24 is detachable and is replaced with an appropriate shape, not only the outer shape of the object to be measured but also the hole pitch and the like can be measured.

The second measuring jaw 30 includes a sliding portion 32 that slides on the main scale 10, and the set screw 31 is attached to the upper portion of the sliding portion 32 and is symmetrical with the jaw base portion 23. The jaw base 23 made of plastic etc. will be fixed, and this jaw base
A measuring unit 34 made of metal, for example, stainless steel is also fixedly or detachably provided on 33.

An ordinary detector (not shown) is provided inside the sliding portion 32 of the second measuring jaw 30, and the relative displacement amount between the scale 15 and the second measuring jaw 30 is provided by this detector. Is measured, and the measured value is displayed on the display unit 35.

The sliding portion 32 of the second measuring jaw 30 is provided with the second measuring jaw 30 via the shock absorbing means 40 shown in FIGS.
The finger rest 50 for operation of is attached to the second measuring jaw 30 so as to be movable.

In FIG. 5 to FIG. 7, the shock absorbing means 40 has two
Plate guide 42 as a guide support portion having a substantially T-shaped cross section attached via a screw 41 of a book, and this plate guide
Two leaf springs 43 as elastic members, one end of which is fixed to be parallel to each other, are provided.

As shown in FIGS. 6 and 7, the finger hook 50 for operating the measurement jaw has a flat trapezoidal cover 51 having an L-shaped vertical cross section, and a lid 52 for closing the opening side of the cover 51. It has a box shape with a substantially U-shaped cross section.

The cover 51 is provided with three protruding portions 53A, 53B and 53C. The left and right protrusions 53A and 53C have recesses 54A and 54C.
And a screw hole 54B is screwed into the central protruding portion 53B. The lid body 52 is fixed to the cover 51 by screwing the screw 55 into the screw hole 54B of the central protruding portion 53B. At this time, the protrusions 56A, 56C formed on the lid 52 are fitted into the recesses 54A, 54C of the left and right protrusions 53A, 53C.

A pair of grooves 58 and 59 extending in the sliding direction of the second measuring jaw are provided on the surfaces of the cover 51 and the lid 52 that face each other. When the cover 51 and the lid 52 are coupled with each other by the screw 55, the grooves 58 and 59 provided in the cover 51 and the lid 52 are fitted into the T-shaped head of the plate guide 42 in a concavo-convex manner. As a result, the finger rest 50 is slidably supported by the plate guide 42, and the groove 58, 59 and the plate guide 42 constitute a guide support portion.

The other ends of the two leaf springs 43 of the shock absorbing means 40 are inserted into a recess having an L-shaped cross section provided on the bottom surface of the cover 51, and are covered by the spacer 57 fitted in this recess.
It is attached to 51. As a result, the cover 51
The leaf spring 43 is swingably supported in the direction of arrow A with respect to the jaw base 32 of the second measuring jaw 30 by the action of the leaf spring 43. A gap D is formed between the finger rest 50 and the jaw base 32, as shown in FIG.
It is said that the finger rest 50 can be moved in the A ₂ direction by a minute.

The caliper 1 according to the present embodiment is basically constructed as described above, and its operation will be described with reference to FIG. 8 as well.

In FIG. 1, first, the first measuring jaw 20 is moved in the arrow A ₁ or A ₂ direction and fixed to the main scale 10 at a predetermined position via a fixing screw 21.

Then, in a state of turning on the power switch of the display unit 35, the second measuring jaw 30 is moved in the arrow A ₂ direction by applying a finger to the finger 50 of the second measuring jaw 30, first, second The measuring parts 24, 34 of the measuring jaws 20, 30 are brought into contact with each other. In this state, the zero set switch is pressed to zero the display on the display unit 35.

Then, the second measuring jaw 30 is moved in the direction of the arrow A ₁ to separate the first measuring jaw 20 and the second measuring jaw 30 by a predetermined distance, and then an object to be measured (not shown) is positioned therebetween. At this time, a part of the object to be measured is brought into contact with the measuring section 24 of the first measuring jaw 20.

Next, displace the second measuring jaw 30 in the direction of arrow A ₂ ,
The measuring section 34 is brought into contact with the object to be measured. At this time, the impact due to this contact tends to be applied to the object to be measured, but the impact is absorbed by the impact absorbing means 40.

That is, the second measuring jaw 30 and the finger rest 50 are integrally formed.
The second measuring jaw 30 is stopped by the movement in the A ₂ direction and the contact between the measuring portion 34 of the second measuring jaw 30 and the object to be measured. On the other hand, the finger rest 50 continues to move in the direction of arrow A ₂ as shown in FIG.

An impact is about to occur due to the stop of the second measuring jaw 30 and the movement of the finger rest 50, but this impact is caused by the leaf spring.
Absorbed by displacement of 43. Therefore, no impact is applied to the second measuring jaw 30 that contacts the object to be measured, and thus to the detector including the display unit 35. Moreover, the object to be measured can be sandwiched between the first and second measuring jaws 20 and 30 with a constant pressing force.

In this way, by visually recognizing the display unit 35 with the object to be measured held between the first and second measuring jaws 20 and 30,
Can measure the dimensions of the object to be measured.

According to this embodiment, the following effects can be obtained.

That is, since the finger rest 50 is attached to the second measuring jaw 30 via the shock absorbing means 40, the object to be measured can be always clamped with a constant pressing force, and moreover, the detector as in the conventional case. Moreover, the object to be measured is not impacted, and the main scale 10 is not deformed or bent. As a result, there is no variation in measurement accuracy, and the effect of enabling precise measurement is obtained.

Further, as a guide supporting portion for slidably supporting the finger rest 50, grooves 58, 59 extending in the sliding direction of the measuring jaw 30 and the head of the plate guide 42 having a substantially T-shaped cross section are fitted to each other. Therefore, the moving direction of the finger rest 50 is measured
Limited to the direction along the sliding direction of 30, the leaf spring 43,
The leaf spring 43 is not deformed in an unreasonable direction without being applied with a force for crushing or twisting the leaf spring 43, the leaf spring 43 is less likely to be damaged, and the durability of the caliper 1 can be improved. .

Furthermore, since the elastic member is the leaf spring 43, one end of this leaf spring 43 is fixed to the measuring jaw 30 side, and the other end is attached between the concave portion of the finger rest 50 and the spacer 57, so that the finger rest 50 can be moved. Even if the leaf spring 43 is not strongly pulled, excessive tension is not applied to the leaf spring 50. From this point as well, the leaf spring 43 is less likely to be damaged and the caliper 1 has good durability, and the finger hook 50
Does not impair the smooth sliding of

Moreover, since the finger rest 50 has a box shape and the leaf spring 43 is housed therein so that the leaf spring 43 is not exposed to the outside, the appearance and usability of the caliper 1 can be improved, and the caliper 1 can be accidentally dropped. The leaf spring 43 can be protected from this.

Further, since the first measuring jaw 20 is slidable on the main scale 10, it is possible to move the first measuring jaw 20 to a place where it is easy to measure and measure the object to be measured.

Further, since the main scale 10 is provided with the support member 11 formed of carbon fiber reinforced plastic, not only the main scale 10 but also the caliper 1 itself can be lightened and the handleability becomes good. Moreover, since the stainless steel scale base 13 to which the main scale 15 is attached is stretchably attached to the support member 11 of the main scale 10 while maintaining a predetermined clearance, the plastic scale base 13 is resistant to temperature changes. Made of supporting member 11
And the metal scale base 13 can freely expand and contract. Therefore, since the main scale 10 and thus the scale 15 can maintain their straightness without causing bending and distortion even at a high temperature, also from this point, it is possible to perform an accurate measurement.

Although the present invention has been described above with reference to the preferred embodiment, the present invention is not limited to this embodiment, and various improvements and design changes can be made without departing from the scope of the present invention. Of course.

For example, the main scale 10 is not limited to the support member 11 made of carbon fiber reinforced plastic and the slide base 13 made of metal, but may be made entirely of metal such as stainless steel or made of ceramic. However, if it is configured as in the above-mentioned embodiment, there is an advantage that the entire caliper can be reduced in weight. However, even if the main scale 10 is made of stainless steel or the like, if the caliper becomes large, the impact when the second measuring jaw 30 comes into contact with the object to be measured becomes large. The finger rest 50 through the shock absorbing means 40 according to the invention
By providing, it is possible to reduce the inconvenience caused by the impact.

It goes without saying that the impact means 40 according to the present invention is not necessarily applied to a large caliper, but can be applied to a small caliper.

Further, the main scale 10 is not limited to the structure of the above-described embodiment, but can be formed by laminating and bonding carbon fiber reinforced plastic and aluminum or aluminum alloy, and in this case, directly supports the main scale 15. Since it can be attached to the member 11, there is an advantage that the slide base 13 is unnecessary.

Further, the support member 11 is not limited to the reinforced plastic made of carbon fiber, but may be a material reinforced by another material such as glass fiber or metal fiber.

Further, the first measuring jaw 20 does not necessarily have to slide with respect to the main scale 10, and may be fixedly provided from the beginning.
However, if it is slidable, there are advantages as described above.

[Effect of device]

As described above, according to the present invention, even with a large-scale caliper, there is an effect that the measurement accuracy is not deteriorated by the impact caused by the contact of the measuring jaw with the object to be measured.

[Brief description of drawings]

FIG. 1 is a front view showing the overall construction of an embodiment of the present invention, FIG. 2 is a bottom view in which a part of FIG.
1 is a perspective view and a sectional view showing a part of the main scale in the embodiment of FIG. 1, FIG. 5 is an enlarged sectional view of a finger hook portion in the embodiment of FIG. 1, and FIG. 6 is a VI of FIG. 7 is a sectional view taken along line -VI, FIG. 7 is a sectional view taken along line VII-VII of FIG. 6, and FIG. 8 is an operation explanatory view of FIG. 1 …… Vernier caliper, 10 …… Main scale, 11 …… Supporting member, 13 …… Scale base, 15 …… Main scale, 20 …… First measuring jaw, 30 …… Second measuring jaw, 40 …… Shock absorbing means, 42 ... Plate guide, 43 ... Leaf spring, 50 ... Finger rest for operating measurement jaw, 51 ... Cover, 52 ... Lid, 57
…… Spacer, 58,59 …… Groove.

Claims (1)

[Scope of utility model registration request] 1. A pair of measuring jaws attached to a main scale, wherein at least one of the pair of measuring jaws is slidable with respect to the main scale, and an object to be measured is contacted between the pair of measuring jaws. In a caliper whose dimensions are measured by making contact with each other, slide one finger on the measuring jaw along the sliding direction of the measuring jaw on one of the measuring jaws slidable on the main scale. A shock absorbing means having a guide support portion that movably guides and supports, and a leaf spring that is an elastic member interposed between the finger hook and the measurement jaw and elastically deformed by sliding of the finger hook is provided. The finger rest has a cross-sectional shape L intersecting the sliding direction.
A box-shaped cover having a substantially U-shaped cross-section, which has a V-shaped cover and a substantially flat plate-shaped lid that closes the opening side of the cover, and the guide support portion includes the finger-holding cover and the lid. A pair of grooves extending in the sliding direction, which are provided on the surfaces facing each other, and a head of a plate guide having a substantially T-shaped cross section, which is fixed to the slidable measuring jaw side, are fitted to each other. The entire leaf spring is housed inside the finger rest, one end is fixed to the plate guide, and the other end is inserted into a recess provided inside the finger rest and the recess is formed. A caliper characterized in that it is attached to the finger rest by a spacer fitted in.