JPS5822166Y2 - rigid endoscope - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rigid endoscope that warns of an abnormal situation when an external force close to a dangerous external force is applied to the optical viewing tube, and prevents the danger from occurring.

Generally, with industrial rigid endoscopes, the optical viewing tube for observation is inserted deep into the object to be inspected for observation. They are often bent, which can result in distorted observed images or even damage.

In many cases, the user does not notice such a situation, which poses a problem.

The present invention was developed in light of the above circumstances, and its purpose is to display the abnormality and notify the user when an external force close to a dangerous external force is applied to the optical viewing tube. Our objective is to provide a rigid endoscope with improved performance.

Various embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.

In the figure, reference numeral 1 denotes an operating section main body of the endoscope, and an optical viewing tube 3 is attached to the end opposite to the eyepiece section 2. As shown in FIG.

This optical sight tube 3 is a mantle tube 4 that protrudes from the operation section main body 1.
It is inserted into the inside of the operating section main body 1, and also partially protrudes into the operating section main body 1.

Furthermore, a strain gauge 5 serving as a pressure detector is fixedly mounted in the gap between the mantle tube 4 and the operating section main body 1 at the front of the attachment point of the mantle tube 4 .

This strain gauge 5 is electrically connected to an indicator lamp 6 as an abnormality alarm, and as shown in FIG. The display lamp 6 is turned on.

That is, by lighting the indicator lamp 6, it can be known in advance that dangerous bending stress is being applied to the optical viewing tube 3.

Note that 7 in the figure is a power source for the indicator lamp 6 as an abnormality alarm.

As shown in FIG. 1, when the optical viewing tube 3 is in a straight state with no external force applied to it, no distortion occurs in the strain gauge 5, and therefore the indicator lamp 6 does not light up.

However, when a bending force is applied as shown in FIG. 2, the strain gauge 5 located between the front end of the operating section main body 1 and the mantle tube 4 is compressed, and when this change exceeds a certain level, the indicator lamp 6 is turned on. Light.

Therefore, the abnormal situation is notified before dangerous bending stress is applied to the optical viewing tube 3.

3 and 4 show a second embodiment of the present invention.

That is, in this embodiment, metal rings 8 and 9 are concentrically attached to the outer periphery of the outer tube 4 and the inner surface of the operating section main body 1, respectively, near the joint between the outer tube 4 and the operating section main body 1.
Usually, they should be kept apart from each other.

When the mantle tube 4 is bent, the metal ring 8 attached to the mantle tube 4 comes into contact with the other ring 9.

In other words, when no bending force is applied to the outer tube 4 of the optical viewing tube 3, each metal ring 8,
9 are separated from each other, but before bending stress is applied to the mantle tube 4 and this bending stress reaches a dangerous strength, they touch each other and are electrically connected.

That is, each of the metal rings 8 and 9 constitutes an electric switch.

Therefore, when a bending stress equal to or greater than - is applied, the indicator lamp 6 lights up, making it possible to prevent danger.

In addition, since the metal rings 8 and 9 are used in this embodiment, the same operation is possible for bending in any direction.

FIG. 5 shows a third embodiment of the present invention.

That is, in this embodiment, a strain gauge 10.11 is attached to the side surface of the outer tube of the optical viewing tube 3, and the amount of bending is determined by utilizing changes in the strain gauge 10.11, which expands and contracts in accordance with the bending of the outer tube 4. It detects and warns of danger.

Note that the strain gauge 10.11 may be attached anywhere that indicates bending.

6 and 7 show a fourth embodiment of the present invention.

That is, in this embodiment, one end of an L-shaped metal piece 12 is attached to the side surface of the outer tube 4 of the optical viewing tube 3, and the piece 13 at the other end is made parallel to the outer tube 4.

Furthermore, the metal ring 14 is inserted into the piece 13.
is attached to the side of the mantle tube 4, and the metal piece 13 and metal ring 14 constitute an electric switch.

When the mantle tube 4 is in a straight state without bending as shown in FIG. 6, the metal piece 13 and the metal ring 14 are separated, but as shown in FIG. When the bending stress approaches a dangerous strength, they touch each other and become electrically connected.

Then, the indicator lamp 6 is turned on to notify the user of the abnormality.

In addition, although each of the above-mentioned embodiments uses an indicator lamp as an abnormality alarm, a buzzer or the like may be used in place of or in combination.

As explained above, the rigid endoscope of the present invention is equipped with a pressure detector that detects when an external force close to a dangerous degree is applied to the optical viewing tube, and an abnormality alarm alerts the user. By informing the public, the danger can be prevented.

That is, it is possible to prevent as much as possible the application of abnormal force to the optical viewing tube, which would distort the observed image or damage it.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a first embodiment of the present invention, Fig. 2 is a side view of the first embodiment in a bent state, and Fig. 3 is an operating section of the second embodiment of the present invention. , FIG. 4 is a longitudinal sectional view of the operating section of the second embodiment, FIG. 5 is a side view of the third embodiment of the present invention, and FIG. 6 is a side view of the fourth embodiment of the present invention.
FIG. 7 is a side view of the embodiment in a bent state. 1... Operation unit main body, 3... Optical viewing tube,
4... Outer tube, 5... Strain gauge, 6.
...Indication lamp, 8,9...Metal ring, 10.11...Strain gauge, 13...
Metal piece, 14...Metal ring.

Claims (1)

[Scope of utility model registration request] A rigid endoscope having an optical viewing tube attached to the main body of the operating section, comprising a pressure detector for detecting bending force applied to the optical viewing tube, and an abnormality alarm activated by the pressure detected by the pressure detector. A rigid endoscope that is characterized by: