JP3320054B2 - Gripping force converter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripping force converter which can be used for, for example, a gripping force measuring device and can obtain an electrical output.

[0002]

2. Description of the Related Art Conventionally, a mechanical measuring device using a spring force has been used in a grip force measuring device and the like.

[0003]

However, in the above-mentioned conventional example, there are few devices which generate electric power electrically. Therefore, it is difficult to perform unmanned measurement or to perform measurement remotely.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a gripping force converter that converts an externally applied pressing force, gripping force, gripping force, and the like into an electric quantity.

[0005]

A gripping force converter according to the present invention for achieving the above object is a gripping force converter in which a load receiving portion, a detecting portion, and a supporting portion are formed by processing a metal block. The load receiving portion composed of receiving portions divided into a plurality of portions by slits having a substantially circular cross section and provided in the radial direction is provided at both ends of these receiving portions via the detecting portion composed of a bridge portion. And a strain gauge is attached to the detection unit.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. As shown in the perspective view of FIG. 1, the exploded perspective view of FIG. 2, the cross-sectional view of the load receiving portion of FIG. 3, and the vertical cross-sectional view of FIG. 4, the gripping force converter of the present embodiment has a substantially columnar central shape. It comprises a load receiving portion 1, support portions 2 on both sides, and a detecting portion 3 connected to the load receiving portion 1 and the support portion 2. In the load receiving portion 1, two slits 4 are provided radially in a cross shape, Aperture angle is 90
It is equally divided into four receiving parts 1a to 1d each having a fan-shaped cross section. Each of the receiving portions 1a to 1d has two detection portions 3 each having a bridge portion 3a to 3h having a prismatic shape at both ends.
Are connected to the support portions 2 on both sides through the respective members. These are cut from, for example, an integral cylindrical metal block such as steel or aluminum by a lathe, a milling machine, or a wire cut.

The insides of the bridge portions 3a to 3h in the detection section 3 are cut off in an arc shape, and a total of 16 strain gauges 5 are attached to the outside flat portions, two for each of the bridge portions 3a to 3h. It is a strain gauge 5
The lead wire 6 is drawn out from a center hole provided in one support portion 2 to an external measurement circuit. The detecting unit 3 and the supporting unit 2 are covered with a separate metallic cylindrical cover 7 having the same diameter as the load receiving unit 1. The cover 7 is inserted into the supporting unit 2 as shown in the drawing. Or, it is fixed by screwing.

The detecting section 3 is designed so that a linear mechanical strain is generated with respect to the gripping force applied to the load receiving section 1, and a strain gauge 5 is provided at a position where mechanical strain occurs in the bridge portions 3a to 3h. A change in the resistance value of the strain gauge 5 proportional to the mechanical strain is converted into an electric quantity.

Also, the bridge portions 3a to 3h, the number of which is twice as large as the number of divisions of the load receiving portion 1, are individually calibrated with a weight or the like, and the differences in the characteristics of the bridge portions 3a to 3h are different. , Are electrically and mechanically compensated in advance. Since the gripping force applied to the entire transducer is detected by the sum of the divided receiving portions 1a to 1d, the individual outputs of the strain gauges 5 are electrically combined, and the numerical value is given to the entire cylindrical shape. Force.

For example, when measuring grip strength, the load receiving portion 1 is
, The receiving portions 1a to 1d are stressed inward, and the force is transmitted to the detecting portions 3 on both sides, and the bridge portions 3a to 3h are deformed as shown in FIG. The deformation at this time is detected by the strain gauges 5, the outputs of these strain gauges 5 are added up in an electric circuit, and electrically measured as a grip force applied to the entire load receiving portion 1. Also,
By dividing the grip force by the surface area of the entire load receiving portion 1, it can be converted to a pressing force applied per unit area.

Also, the gripping force in each direction can be measured, and the deformation of each of the bridge portions 3a to 3b is individually obtained,
It is easy to measure the size for each direction.

Although this gripping force converter can measure various gripping forces, when it is measured as a tightening force such as a supporter or stocking, the samble S is connected to the load receiving portion as shown in FIG. 1 and may protrude from both sides of the load receiving portion 1, and the protruding portion is in a state where it does not receive a gripping force due to the outer shape of the transducer, so it becomes no resistance, and that portion is greatly deformed. Will be. For this reason, a biased concentration force is applied to the end of the load receiving portion 1, and an error occurs, so that accurate measurement cannot be performed.

In order to cope with such a case, covers 7 having the same diameter as the diameter of the load receiving portion 1 are provided on both sides of the load receiving portion 1, and as shown in FIG. By holding the gripping force of the portion with the cover 7 and applying a normal gripping force to the load receiving portion 1, the tightening force per unit area of the sample S can be accurately obtained. Therefore, the cover 7 not only mechanically protects the detection unit 3 but also effectively acts on such an object to be measured.

According to the gripping force converter of the present invention, the gripping force can be obtained numerically by an electrical output, instead of the conventional measurement based on human experience. For example, the following can be mentioned as the measurement object.

Measuring the tightening force of a supporter or the like used for medical supplies or health equipment, measuring the tightening force of underwear, socks, etc., measuring the tightening force of a rubber band or the like used in daily necessities,
Measurement of winding force by tape, measurement of radial force applied to pulley shaft by tension of belt between pulleys by transmission of rotation used for industrial use, measurement of metal and rubber roll pressing pressure, knob, knob Measurement of grip force etc.

Further, in the embodiment, the load receiving portion 1 is divided into four by providing two slits 4, but it is not necessarily divided into four.
There is no problem even if a plurality of divisions such as two divisions and three divisions are used. Further, the outer shape is not necessarily a columnar shape but may be a substantially circular shape such as a polygon, for example, and various modifications are possible within the scope of the gist of the present invention.

[0017]

As described above, the gripping force converter according to the present invention can electrically measure the force in the tightening direction and can be applied to various uses.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is an exploded perspective view.

FIG. 3 is a cross-sectional view.

FIG. 4 is a longitudinal sectional view.

FIG. 5 is an end view of a deformed state when a load is applied.

FIG. 6 is an explanatory view of a state where there is no cover.

FIG. 7 is an explanatory diagram of a state where a cover is provided.

[Description of Signs] 1 Load receiving part 1a-1d Receiving part 2 Support part 3 Detecting part 3a-3d Bridge part 4 Slit 5 Strain gauge 6 Lead wire 7 Cover

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Jin Yabe 1-17-16 Nishihogima, Adachi-ku, Tokyo Inside Showa Sokki Co., Ltd. (72) Katsuya Kaneko 1-17-16 Nishihogima, Adachi-ku, Tokyo No. Showa Sokki Co., Ltd. (72) Inventor Satoshi Ishiyama 1-17-16 Nishihokima, Adachi-ku, Tokyo (Showa Sokki Co., Ltd.) (56) References Fully open 1988-193003 (JP, U) Fully open 62-50661 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01L 5/00 A61B 5/22

Claims (3)

(57) [Claims] 1. A gripping force converter comprising a load receiving part, a detecting part, and a supporting part formed by processing a metal block, wherein a plurality of slits have a substantially circular outer cross-section and are provided in a radial direction. The load receiving portion, which is composed of receiving portions divided into two, is provided at both ends of these receiving portions through the detecting portion, which is a bridge portion.
Gripping force transducer, characterized in that connected to the support portion, and attaching a strain gauge to the detection unit. 2. The load receiving portion according to claim 1, wherein said load receiving portion is substantially cylindrical.
6. A gripping force converter according to item 1. 3. The gripping force converter according to claim 2 , wherein a separate cover having the same outer diameter as the outer diameter of the load receiving portion is provided around the detecting portion.