JPH0346737Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a protection mechanism for a muscle strength measuring device for measuring muscle strength.

Conventional technology As a conventional technology, there is Utility Model Application No. 61-205507. The technology disclosed in this bulletin is to install a pressure sensor inside the grip of a muscle strength measuring device in which the grip and the housing are connected by a cord, and apply pressure to the base end of a conduction rod with a contact piece attached to the tip. The pressure sensor is applied to the sensor, and the signal from the pressure sensor is electrically processed and displayed on the display.

Problems to be solved by the invention In Utility Model Application No. 61-205507, which was provided as a conventional technique, if an excessive pressure exceeding the rating is applied to the contact piece by mistake, the pressure sensor section will undergo permanent strain, causing stress-strain characteristics to deteriorate. changes, making it impossible to accurately measure muscle strength.

Means for Solving the Problems The present invention solves the above problems, and aims to provide a protection mechanism for a muscle strength measuring device that can always accurately measure muscle strength and reduce the occurrence of failure of the strain plate. .

That is, in the present invention, a strain plate 10 is horizontally attached to a housing 2 made of a cylindrical container, and a compressor 6 that contacts the strain plate 10 and an elastic body 8 that contacts the compressor 6 are disposed inside the housing 2. and a pressure receiving tool 3 that contacts the elastic body 8 and receives an external pressing force are arranged in series, and when the elastic body 8 pushed by the pressure receiving tool 3 that moves in response to external force is displaced by a predetermined length, the pressure receiving tool 3 is disposed in series. 3 hits the housing 2, and the external pressing force applied to the pressure receiving tool 3 causes strain plate 1.
This is a protection mechanism for a muscle strength measuring device that is characterized by not transmitting the signal to zero.

Embodiment The structure of an embodiment of the present invention will be described in detail based on the accompanying drawings.

A housing 2 is installed at the center of the grip 1 shown in FIG. 1, and a pressure receiving device 3 for receiving pressure is connected to the housing. The pressure receiving device 3 consists of an attachment 4 that receives pressure, and an attachment fixture 5 to which the attachment 4 is attached.
It is provided so as to be able to freely slide inward from a. A portion of the attachment fixture 5 that exists outside the open end 2a of the housing 2 is formed as a flange portion 5a that is thicker than the hole diameter of the housing 2. A compressor 6 that slides inside the cavity is inserted into the cavity of the housing 2, a spherical projection 7 is formed at the center of the flat part 6a at the tip of the compressor 6, and the inside of the body of the compressor 6 is formed into a cavity. The proximal end is open. Further, the periphery of the side portion of the flat portion 6a of the compressor 6 is slightly protruded in the shape of a brim, and this protrusion portion 6b is hooked into the inner cylinder groove portion 2a of the housing 2. The cylindrical portion 5b of the attachment fixture 5 is slidably fitted into the internal cavity of the compressor 6.
An elastic body 8, ie, a spring, is inserted into the cylindrical portion 5b, the tip of which is in pressure contact with the compressor 6, and the base end of which is in pressure contact with the inner surface of the flange portion 5a of the attachment fixture 5.

The attachment fixture 5 is attached to the compressor 6 by a screw 9 which is inserted through the attachment fixture 5 and screwed onto the compressor 6. The details of this configuration are such that a hole into which a screw 9 is slidably inserted is opened in the center of the attachment fixture 5, and the widened part of the head of the screw 9 is hooked to the attachment fixture 5. is hung on the compressor 6 at a predetermined interval while applying a predetermined pressure to the spring 8.

A deformable plate 10 which is linearly deformed by a pressing force is horizontally attached to the distal end of the housing 2, and the spherical protrusion 7 is brought into contact with a substantially central portion of the inner surface of the deformable plate 10. A strain gauge 11 is attached to approximately the center of the outer surface of the strain plate 10, a wire 12 taken out from the strain gauge 11 is connected to a connector 14 attached to one side of the grip 1, and a cord 15 connected to the connector 14 is attached.
The tip is connected to the display section 16.

The display section 16 includes a case 17, an electric circuit section 18 housed in the case 17 that electrically processes the signal obtained from the strain gauge 11, and a display attached to the front surface of the case 17 that digitally displays the output of the electric circuit section 18. It consists of a vessel 13.

Function: In the device of the present invention, an examiner who is measuring muscle strength grasps the grip 13 and brings the attachment 4 into contact with the measurement site of the patient whose muscle strength is to be measured. The patient presses the attachment 4 by applying force to the muscle, and this pressing force is displayed on the display 13.

The transmission path of the pressing force applied to the attachment 4 is first transmitted from the attachment 4 to the attachment fixture 5, and then further transmitted to the spring 8, the compressor 6, and the strain plate 10. Due to this pressing force, the strain plate 10
and the strain gauge 11 attached to the strain plate 10 is distorted,
The resistance change of the strain gauge 11 caused by this distortion is detected and amplified by the electric circuit section 18. The signal from the electric circuit section 18 is displayed as an indicator 19 as the muscle strength.
to be displayed.

When the pressing force of the attachment 4 is transmitted from the attachment fixture 5 to the compressor 6, this pressing force is transmitted via the spring 8 which is compressed and housed in the ring between the attachment fixture 5 and the compressor 6. Extension force stored at 8 (30Kg in example)
The pressing force is transmitted via the spring 8 to the compressor 6 and then to the deformable plate 10 until a pressing force exceeding the above is applied to the attachment 4.

When the attachment 4 receives a pressing force greater than the tensile force of the contracted spring 8, the spring 8 contracts and the flange 5a of the attachment fixture 5 comes into contact with the open end 2a of the housing 2, and the pressing force is equal to the flange. Part 5a
conduction from the strain plate 1 to the housing 2.
It stops conducting at 0.

In the embodiment, the spring 8 is compressed by a screw 9 so as to maintain a predetermined tension in the spring 8, but in other embodiments, the screw 9 is not provided and the spring 8 is contracted only slightly until a predetermined pressure is applied to the spring 8. Applying the pressing force of the attachment 4 to the strain plate 10 while causing contraction of the
When the pressure exceeds a predetermined pressure, the amount of contraction of the spring 8 increases, and this contraction causes the flange 5 of the attachment fixture 5 to
It may be configured such that a is in contact with the open end 2a of the housing 2 to avoid the pressing force applied to the strain plate 10.

Effects of the invention The attachment fixture, which is slidably inserted into the housing housed in the grip of the present invention, is provided with a flange, and a spring is interposed in series between the attachment fixture and the strain plate. Therefore, when an excessive pressing force is applied to the attachment, the spring contracts and the flange of the attachment fixture comes into contact with the open end of the housing. Therefore, excessive pressing force that exceeds the rating applied to the attachment will not be applied to the strain plate but to the housing, so the strain plate will not be distorted beyond its elastic limit and will cause permanent strain in the strain plate. There is no. Therefore, it was possible to eliminate the measurement error of muscle force caused by the permanent strain of the strain plate.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention.
2 is a block diagram showing the electrical structure, and FIG. 3 is a perspective view of the grip. 2... Housing, 3... Pressure receiving tool, 6... Compressor, 8... Elastic body, 10... Strain plate.

Claims (1)

[Scope of utility model registration request] A strain plate 10 is horizontally attached to a housing 2 made of a cylindrical container, and inside the housing 2 are a compressor 6 that contacts the strain plate 10 and an elastic body 8 that contacts the compressor 6.
and a pressure receiving tool 3 that contacts the elastic body 8 and receives an external pressing force are arranged in series, and when the elastic body 8 pushed by the pressure receiving tool 3 that moves in response to external force is displaced by a predetermined length, the pressure receiving tool 3 is disposed in series. 3 hits the housing 2 and the pressure receiving tool 3
A protection mechanism for a muscle strength measuring device characterized in that external pressing force applied to the strain plate 10 is not transmitted to the strain plate 10.