WO2020012684A1 - Endoscope - Google Patents

Abstract

This endoscope is equipped with: a plurality of exterior members 51 to 53; an inner member 60 made from a material having a different linear thermal expansion coefficient from that of the exterior members 52, 53; a protrusion part 51t protruding inward from the exterior member 51; a facing part 62d facing the protrusion part 51t; and an elastic member 80 that is deformed by a force generated in the longitudinal direction N as a result of elongation or contraction of the exterior members 51 to 53 in the longitudinal direction N relative to the inner member 60 due to heat being applied to the exterior members 51 to 53 and the inner member 60.

Description

Endoscope

The present invention relates to an endoscope including a plurality of exterior members abutted along a longitudinal axis.

In recent years, endoscopes have been widely used in the medical and industrial fields. The endoscope can observe and treat the inside of the subject by inserting the elongated insertion portion into the subject.

操作 In addition, at the base end of the longitudinal axis of the insertion section, an operation section provided with various buttons and knobs for operating the endoscope, a grip section, and the like is provided in series.

The base end of the insertion section is connected to the operation section by a base provided at the base end being fixed to an internal member provided in the operation section by a fixing member.

外 装 In addition, in order to improve the assemblability of the internal member in the operation unit, the maintenance, and the like, the exterior member of the operation unit is composed of a plurality of detachable members.

Further, in a state where the outer peripheral portion of each of the exterior members having a cylindrical shape or a concave shape is in contact with each other in a direction along a longitudinal axis, a plurality of exterior members are fixed by screwing the lid of the exterior member from the insertion portion side. The configuration of an operation unit in which members are abutted in a direction along a longitudinal axis is also well known, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-37705.

By the way, the exterior member of the operation unit is often made of a material having a high coefficient of linear expansion, such as resin, in order to secure electrical insulation and reduce the weight.

Further, a frame fixed to the exterior member while holding an internal member provided in the operation unit, for example, a known bending mechanism for bending operation provided in the operation unit, is made of a wire rather than a resin in order to secure mechanical strength. It is often made of a material such as a metal having a low expansion coefficient.

Here, when the endoscope is a medical endoscope, it is known that a known autoclave sterilization process is performed after use. However, since this sterilization process is performed in a high-temperature environment, that is, the linear expansion load is increased. Under the environment, the exterior member and the internal member linearly expand in a direction along the longitudinal axis.

At this time, as described above, the exterior member and the internal member have different linear expansion coefficients because the constituent materials have different linear expansion coefficients.

Specifically, the outer member expands more than the inner member. That is, a displacement difference occurs between the exterior member and the internal member.

結果 As a result, an excessive load is applied to the internal member such as the fixing portion of the internal member to the exterior member, and the internal member is deformed and the fixing portion is displaced.

Note that the above problem is not limited to the operation unit, and the same applies to other parts of the endoscope.

The present invention has been made in view of the above circumstances and problems, and in a linear expansion load environment, even if a linear expansion larger than the internal member occurs in the exterior member, the load on the internal member can be reduced. An object of the present invention is to provide an endoscope having a configuration that can be performed.

An endoscope according to one embodiment of the present invention includes a plurality of exterior members abutted along a longitudinal axis and, provided inside the exterior member, a part of which is fixed to one of the plurality of exterior members, An inner member made of a material having a different linear expansion coefficient from the outer member, and a position different from a position where the part of the inner member is fixed in a direction along the longitudinal axis in the plurality of outer members; And a protrusion protruding inward in the radial direction of the exterior member, a facing portion facing the protrusion in a direction along the longitudinal axis, and a direction along the longitudinal axis in the internal member. The exterior member is inserted between the protrusion and the facing portion, and is applied to the exterior member and the interior member by applying heat to the exterior member in a direction along the longitudinal axis with respect to the interior member. Such elongation or by the relative shrinkage comprising a resilient member which is deformed by a force generated in a direction along the longitudinal axis.

FIG. 2 is a perspective view schematically showing the configuration of the endoscope according to the first embodiment. FIG. 2 is a partial cross-sectional view schematically illustrating a configuration of an operation unit along a line II-II in FIG. 1. FIG. 2 is a partial cross-sectional view schematically illustrating a state in which the exterior member of FIG. 2 extends in the longitudinal direction and compresses the elastic member. FIG. 2 is a partial cross-sectional view schematically showing a modified example of the configuration of the operation unit in which the O-ring of FIG. 2 is configured by a compression spring. FIG. 2 is a partial cross-sectional view schematically illustrating a modification of the configuration of the operation unit in which the position where the elastic member of FIG. 2 is provided is changed and the elastic member is further configured by a tension spring. FIG. 2 is a partial cross-sectional view schematically illustrating a modification of the configuration of the operation unit in which the elastic member of FIG. 2 includes a plurality of members. Partial cross-sectional view schematically showing a modification of the configuration of the operation unit that does not use an elastic member to absorb a displacement difference at a high temperature. FIG. 9 is a partial cross-sectional view schematically illustrating a configuration of an operation unit of an endoscope according to a second embodiment. FIG. 8 is a partial cross-sectional view schematically showing a state in which the exterior member of FIG. 8 is extended in the longitudinal direction and the elastic member is compressed. FIG. 8 is a partial cross-sectional view schematically showing a configuration of an operation unit according to a modification in which a displacement absorbing unit is provided between a distal end portion and a proximal end portion in the built-in component of FIG. FIG. 8 is a partial cross-sectional view schematically illustrating a configuration of an operation unit according to a modification in which an outward flange abutting on a lid is provided on the outer periphery of a base end of the insertion unit in FIG. 8. FIG. 8 is a partial cross-sectional view schematically showing a state in which an O-ring between a lid and an exterior member in FIG. 8 is extended in a longitudinal direction. 2 and 8 are partial cross-sectional views schematically showing a configuration of an operation unit according to a modification in which the internal component of FIG. 13 is a partial cross-sectional view schematically illustrating a configuration of an operation unit according to a modified example in which a leaf spring is provided between the built-in component and the lid in FIG. 13. 2 and 8 are partial cross-sectional views schematically showing a configuration of an operation unit according to a modified example in which a direction of a fixing plate for fixing a built-in object to the exterior member is inclined from a longitudinal direction. Sectional drawing which shows the modification which provided the cushioning material between the built-in component and the exterior member of FIG. FIG. 15 is a partial cross-sectional view showing a modification in which a rubber sheet is provided between the fixing plate and the built-in component and between the fixing plate and the head portion of the fixing screw in FIG. 15. FIGS. 2 and 8 are partial cross-sectional views schematically showing a configuration of an operation unit according to a modification in which the internal component is fixed to the exterior member in the longitudinal direction. FIGS. 2 and 8 are partial cross-sectional views schematically showing a configuration of an operation unit of a modification in which the built-in component of FIG. 2 is packaged. FIG. 8 is a partial cross-sectional view schematically showing a configuration of an operation unit having a modification in which an elastic member inserted between exterior members is formed longer in FIG. 8 in the longitudinal direction. FIG. 7 is a partial cross-sectional view schematically illustrating a configuration of an operation unit having a modification in which an elastic member is provided behind a built-in component. FIG. 21 is a partial cross-sectional view schematically showing the configuration of an operation unit in a modification in which a collet chuck structure is provided in a base end portion of the exterior member in FIG. Partial sectional view showing a conventional push switch structure together with an exterior member FIG. 23 is a partial cross-sectional view showing a switch configuration in which a locking portion locked to a pressing portion is provided on the fixing member of FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which the fixing member of FIG. 23 is fixed to an exterior member by screws, together with the exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which flanges are provided at both ends in the through hole direction of the pressing portion in FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration for fixing the outer peripheral surface of the fixing member of FIG. FIG. 23 is a partial cross-sectional view showing a switch configuration in which an insert member is insert-molded in the pressing portion of FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which an insert member is insert-molded on the inner peripheral surface of the pressing portion of FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which a snap fit portion is provided on the pressing portion of FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which a pressing portion is provided at an outer peripheral end of the fixing member of FIG. 23 together with an exterior member. Partial sectional view showing a switch configuration in which the outer peripheral surface of the fixing member of FIG. 23 is formed in a tapered shape together with an exterior member. Partial cross-sectional view showing a switch configuration for connecting and fixing a plurality of switch fixing members by one holding member together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which the end of the fixing member of FIG. FIG. 34 is a partial cross-sectional view showing a state in which the diameter-enlargement member of FIG. FIG. 34 is a partial cross-sectional view showing a switch configuration for fixing the holding member of FIG. 34 to a fixing member with a screw together with an exterior member. FIG. 36 is a partial cross-sectional view showing a switch configuration in which a step portion is provided in the pressing portion of FIG. 36 together with an exterior member. 37 is a partial cross-sectional view showing a state in which the holding member is fitted into the fixing member of FIG. 37 together with the exterior member. FIG. 2 is a partial cross-sectional view showing a switch configuration in which an E-ring is fitted to a position in the exterior member of the switch fixing member together with the exterior member. Partial sectional view showing a switch configuration in which a C-ring is fitted in a pressing portion together with an exterior member. FIG. 23 is a partial cross-sectional view showing a switch configuration in which a spacer is provided between the fixing member and the switch board in FIG. 23 together with an exterior member. FIG. 23 is a partial cross-sectional view illustrating a switch configuration in which a spring is provided between the fixing member and the switch board in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the drawings are schematic, and that the relationship between the thickness and the width of each member, the ratio of the thickness of each member, and the like are different from actual ones. Needless to say, there are portions having different dimensional relationships and ratios.

In the embodiments described below, the exterior member will be described using an example of an exterior member of an operation unit of an endoscope, and the internal member will be described using an example of an internal member provided in the operation unit. I do.

(1st Embodiment)
FIG. 1 is a perspective view schematically showing the configuration of the endoscope according to the present embodiment.

As shown in FIG. 1, an endoscope 1 includes a slender insertion section 2 inserted into a subject, an operation section 4, a universal cable 30, and a connector 32, and a main part is configured. I have.

The insertion portion 2 includes a tip portion 10, a bending portion 12 that can be bent in a plurality of directions, and a longitudinal direction N of the insertion portion 2, in order from the tip side in a direction (hereinafter, referred to as a longitudinal direction) N along a longitudinal axis. The main portion is configured to include the long and hard tube portion 14.

That is, the endoscope 1 in the present embodiment is constituted by a rigid endoscope having a rigid insertion portion 2. Note that, of course, the endoscope 1 may be constituted by a flexible endoscope having a flexible insertion portion.

The operation section 4 is provided continuously to a base end of the tube section 14 in the longitudinal direction N (hereinafter, simply referred to as a base end).

The operation unit 4 is provided with an operation lever 18 that bends the bending portion 12 in the vertical direction and is rotatable and an operation lever 20 that bends the bending portion 12 in the left and right direction and is rotatable. .

操作 Further, the operating section 4 is provided with a fixing lever 22 for fixing the rotational position of the operating lever 18.

Although not shown, the operating section 4 is also provided with a fixing lever for fixing the rotational position of the operating lever 20.

操作 Furthermore, the operation unit 4 has a grip 24 which is gripped by the operator, and the grip 24 is provided with a remote switch 26. The remote switch 26 remotely controls various devices to which the connector 32 is connected.

The universal cable 30 extends from the operation unit 4 and has a connector 32 at the extension end.

The connector 32 has a light guide connection end 32a projecting therefrom. A camera cable 34 extends from the connector 32.

カ メ ラ A camera connector 36 is provided at the extension end of the camera cable 34. The camera connector 36 is connected to a camera control unit (not shown) that performs signal processing on an optical image in the subject imaged by an imaging unit (not shown).

The camera control unit is connected to a monitor (not shown) for displaying an optical image as an image, a video recording device, and the like.

Furthermore, the connector 32 is provided with a ventilation cap 38. Normally, the endoscope 1 has a watertight structure, but the inside of the endoscope 1 is communicated with the outside by opening the ventilation cap 38. That is, the communication between the inside and the outside of the endoscope 1 can be selected by the ventilation cap 38, and the water leak inspection of the endoscope 1 can be performed.

Next, the configuration of the operation unit 4 in FIG. 1 will be described with reference to FIGS. FIG. 2 is a partial cross-sectional view schematically showing the configuration of the operation unit along the line II-II in FIG. 1. FIG. 3 shows a state in which the exterior member of FIG. It is a fragmentary sectional view shown roughly.

操作 As shown in FIG. 2, the operation unit 4 includes an exterior member 50, and the exterior member 50 includes a plurality of exterior members 51 to 53.

In the present embodiment, the case where the exterior member 50 is configured by three is shown as an example, but it is needless to say that the number of exterior members 50 is not limited to three as long as the exterior member 50 is plural. For example, the exterior member 50 may be composed of only the exterior members 52 and 53, or may be composed of four or more.

The exterior members 51 to 53 are arranged so as to abut each other along the longitudinal direction N.

Specifically, a cylindrical exterior member 52 is provided at a tip (hereinafter, simply referred to as a tip) 53a in the longitudinal direction N of the exterior member 53 having a U-shaped cross section having an opening toward the front N1 in the longitudinal direction N. The base end 52b is in contact. The base end 51b of the lid 51 is in contact with the front end 52a of the exterior member 52.

The exterior members 52 and 53 are made of, for example, a resin in order to secure electrical insulation and reduce the weight, and the lid 51 is made of, for example, a metal.

The lid 51 may be made of resin. That is, the entire exterior member 50 may be made of resin.

内部 Further, inside the exterior member 50, an internal member 60 made of a material having a different linear expansion coefficient from that of the exterior member 50 is provided.

The inner member 60 is made of a material having a linear expansion coefficient different from that of the outer member. For example, the inner member 60 is made of a metal material having a lower linear expansion coefficient than resin in order to secure mechanical strength. In other words, the exterior members 52 and 53 are made of a material such as resin having a higher linear expansion coefficient than the inner member 60.

The internal member 60 includes a built-in member 61, a screw 62, and a fixing plate 64, and a main part is configured.

The built-in component 61 is formed of, for example, a frame that holds a known bending mechanism (not shown) for bending operation provided in the exterior member 50.

In addition, the built-in component 61 is formed such that a portion 61t of a base end side (hereinafter, simply referred to as a base end side) in the longitudinal direction N penetrates the exterior member 53 in the radial direction K of the exterior member 50. In a state in which it protrudes out of the exterior member 50 from the hole 53h, a portion on the base end side is fixed to the fixing plate 64 with screws.

Since the fixing plate 64 is fixed to the exterior member 53 with screws, the built-in component 61 is fixed to the exterior member 53. Further, an elastic member 55 such as an O-ring is provided between the inner peripheral surface of the hole 53h and the outer periphery of the portion 61t of the built-in member 61 located in the hole 53h.

The base of the insertion section 2 is fixed to the distal end of the built-in component 61 by a known configuration. A screw 62 is fixed to the outer periphery of the insertion portion 2 on the base end side.

The screw 62 is screwed into the insertion portion 2. The rotation of the screw 62 is not applied to the lid 51.

Here, a protrusion 51 t projecting inward in the radial direction K is provided at a position different from the position where the inner member 60 is fixed in the exterior member 50 in the longitudinal direction N, specifically, at the base end side position of the lid 51. Are provided circumferentially. Note that the protrusion 51t is not limited to the lid 51, and may be provided at another position of the exterior member 50.

In the outer peripheral surface of the screw 62, an opposing portion formed by having a shape in which the base end side of the outer peripheral surface of the screw 62 is reduced in diameter in the radial direction K so as to oppose the protrusion 51 t in the longitudinal direction N. A certain step portion 62d is formed in a circumferential shape.

弾 性 An elastic member 80 composed of an O-ring is inserted in a gap between the step portion 62d and the protrusion 51t in the longitudinal direction N. Since the elastic member 80 is provided in the lid 51, it is not exposed to the outside.

と When the screw 62 is rotated in one direction, it moves toward the rear N2 in the longitudinal direction N, so the lid 51 is pressed toward the rear N2 via the elastic member 80. Further, the exterior member 52 in which the base end 51b of the lid body 51 is in contact with the distal end 52a is pressed against the exterior member 53 toward the rear N2. That is, the proximal end 52b is pressed against the distal end 53a. This allows the base end 52b and the front end 53a to be held in a state of contact in the longitudinal direction N.

The elastic member 80 applies heat to the exterior member 50 and the internal member 60 when the endoscope 1 is placed in a linear expansion load environment, specifically, in a high temperature environment in a known autoclave sterilization process. Accordingly, the exterior member 50 is deformed by a force generated in the longitudinal direction N due to the relative expansion and contraction of the exterior member 50 with respect to the internal member 60 along the longitudinal direction N.

Specifically, as shown in FIG. 3, when the exterior member 50 and the internal member 60 expand in the longitudinal direction N due to the application of heat to the exterior member 50 and the internal member 60, the exterior members 52 and 53 Due to the difference in the expansion coefficient, the inner member 60 expands more in the longitudinal direction N than the inner member 60. That is, a displacement difference in expansion occurs between the exterior members 52 and 53 and the internal member 60.

At this time, the elastic member 80 absorbs the above-described displacement difference by compressing the elastic member 80 by pressing the elastic member 80 against the step portion 62d by moving the protrusion 51t forward N1.

As a result, the load applied to the internal member 60 and the fixing portion of the internal member 60 to the exterior member 53 is reduced. That is, the fixed portion is prevented from being displaced and the internal member 60 is prevented from being deformed.

In order for the elastic member 80 to absorb the above-described displacement difference, the metal rigidity of the protrusion 51t and the step 62d is set to be larger than the force of crushing the elastic member 80 by the protrusion 51t and the step 62d. Good.

(5) When the autoclave sterilization process is completed and the endoscope 1 is placed in a normal temperature environment, the outer member 50 and the inner member 60 contract in the longitudinal direction N.

At this time, as shown in FIG. 2, the elastic member 80 presses the exterior member 52 against the exterior member 53 via the lid 51 in order to extend in the longitudinal direction N, that is, to return to the size before compression. be able to. Therefore, there is no deviation in the positional relationship between the proximal end 52b and the distal end 53a before and after the autoclave sterilization process.

After returning to normal temperature as described above, in order to extend the elastic member 80 to the original size, the amount that the elastic member 80 can be crushed to the maximum is equal to the amount of crushing in the longitudinal direction N when the elastic member 80 is assembled. It is sufficient if the value is set to be larger than a value obtained by adding the compression amount of the elastic member 80 when the exterior members 52 and 53 expand.

As described above, even if the outer members 52 and 53 have a larger linear expansion than the inner member 60 under the linear expansion load environment, the load on the inner member 60 can be reduced, and the members can be reduced before and after the autoclave sterilization process. It is possible to provide the endoscope 1 having a configuration in which no deviation occurs.

Hereinafter, a modified example will be described with reference to FIG. FIG. 4 is a partial cross-sectional view schematically illustrating a modification of the configuration of the operation unit in which the O-ring of FIG. 2 is configured by a compression spring.

弾 性 As shown in FIG. 4, the elastic member 80 provided between the step portion 62d and the protrusion 51t in the longitudinal direction N may be constituted by a compression spring 81.

According to such a configuration, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the above-described displacement difference is absorbed by the compression spring 81 being compressed in the longitudinal direction N. .

(4) When the temperature returns to room temperature, the compression spring 81 expands in the longitudinal direction N, thereby pressing the exterior member 52 against the exterior member 53. Therefore, the same effect as in the above-described embodiment can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 5 is a partial cross-sectional view schematically showing a modification of the configuration of the operation unit in which the position at which the elastic member of FIG. 2 is provided is changed, and the elastic member is formed of a tension spring.

弾 性 As shown in FIG. 5, the elastic member 80 may be provided between the protrusion 51t and the tip 61p of the built-in component 61 in the longitudinal direction N. In this case, the elastic member 80 includes a tension spring 82.

According to such a configuration, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the above-described displacement difference is absorbed by the extension of the tension spring 82 in the longitudinal direction N. .

When the temperature returns to normal temperature, the extension spring 82 compresses in the longitudinal direction N to press the exterior member 52 against the exterior member 53, so that the same effect as in the above-described embodiment can be obtained.

Furthermore, since the tension spring 82 has a smaller elastic modulus than the above-described compression spring 81, it is possible to absorb the above-described displacement difference with a smaller force than in FIG.

Further, another modified example will be described below with reference to FIG. FIG. 6 is a partial cross-sectional view schematically illustrating a modification of the configuration of the operation unit in which the elastic member of FIG. 2 includes a plurality of members.

弾 性 As shown in FIG. 6, the elastic member 80 may be composed of a shaft 90 and a spring 91.

The shaft 90 is provided in the lid 51 and the exterior member 52, the tip is located in the lid 51, and an intermediate position is inserted through a through hole 51 h formed in the lid 51 along the longitudinal direction N. The end is fixed to the exterior member 53.

The spring 91 is interposed between the outward flange 90g formed at the tip of the shaft 90 and the portion 51t of the lid 51 where the through hole 51h is formed.

According to such a configuration, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the spring 91 is compressed in the longitudinal direction N to absorb the above-described displacement difference.

(4) When the temperature returns to the normal temperature, the spring 91 expands in the longitudinal direction N to press the exterior member 52 against the exterior member 53, so that the same effect as that of the above-described embodiment can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 7 is a partial cross-sectional view schematically showing a modification of the configuration of the operation unit that does not use an elastic member to absorb a displacement difference at a high temperature.

As shown in FIG. 7, the cover 51 may be fixed to the exterior member 52 with a screw 93, and the exterior member 52 may be fixed to the exterior member 53 with a screw 94.

According to such a configuration, even when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the lid 51 and the exterior members 52 and 53 are in contact with the outer periphery of the insertion portion 2. Only the sliding movement in the forward direction N1 in the longitudinal direction N via the ring 95 is performed. Therefore, no load is applied to the internal member 60.

Further, even when the temperature returns to room temperature, the lid 51 and the exterior members 52 and 53 merely slide in the rearward direction N2 in the longitudinal direction N via the O-ring 95 that comes into contact with the outer periphery of the insertion portion 2.

Accordingly, since the exterior member 52 and the exterior member 53 are fixed by the screw 94, no displacement occurs between the members before and after the autoclave sterilization process.

From the above, the same effects as in the above-described embodiment can be obtained without using the elastic member 80.

(2nd Embodiment)
FIG. 8 is a partial cross-sectional view schematically showing the configuration of the operation unit of the endoscope according to the present embodiment. FIG. 9 is a schematic view showing a state in which the exterior member of FIG. It is a fragmentary sectional view shown typically.

The endoscope according to the second embodiment differs from the endoscope according to the first embodiment shown in FIGS. 1 to 3 in the structure and the arrangement position of the elastic members.

Therefore, only this difference will be described, the same components as those in the first embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 8, in the present embodiment, the built-in component 61 includes a distal portion 61a and a proximal portion 61b fixed to the proximal end of the distal portion 61a.

A proximal end 2e of the insertion portion 2 is fixed to the lid 51 by a screw portion 51w, and a part thereof is located in the distal portion 61a. Is formed.

Furthermore, in the distal portion 61a, an elastic member 80 is provided between the outward flange 2f in the longitudinal direction N and a circumferential inward flange 61af formed at the distal end of the distal portion 61a.

In the present embodiment, the elastic member 80 is constituted by a compression spring 98. Further, the amount of equipment of the compression spring 98 is set to be larger than the amount of pulling force of a bending operation wire (not shown) inserted into the built-in object 61 and the insertion portion 2.

According to such a setting, the compression spring 98 is not compressed even when the operation wire is pulled during the bending operation of the bending portion 12.

In the longitudinal direction N, an O-ring 56 is inserted between the base end 51b of the lid 51 and the front end 52a of the exterior member 52, and the base end 52b of the exterior member 52 and the front end 53a of the exterior member 53 are provided. An O-ring 57 is also interposed between them.

The other configuration is the same as that of the first embodiment.

According to such a configuration, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, as shown in FIG. 9, a compression spring is provided between the outward flange 2f and the inward flange 61af. 98 is compressed in the longitudinal direction N to absorb the displacement difference described above.

When the temperature returns to room temperature, the compression spring 98 expands in the longitudinal direction N, thereby pressing the exterior member 52 against the exterior member 53. Therefore, the same effect as that of the above-described first embodiment can be obtained. .

Hereinafter, a modified example will be described with reference to FIG. FIG. 10 is a partial cross-sectional view schematically illustrating a configuration of an operation unit according to a modification in which a displacement absorbing unit is provided between a distal end portion and a proximal end portion in the built-in component of FIG.

圧 縮 As shown in FIG. 10, the compression spring 98 need not be used as the elastic member 80. Specifically, the built-in component 61 is composed of a distal portion 61a, a proximal portion 61b, and a displacement absorbing portion 61c sandwiched between the distal portion 61a and the proximal portion 61b in the longitudinal direction N. The displacement absorbing portion 61c may constitute the elastic member 80.

The displacement absorbing portion 61c is made of a material having a higher linear expansion coefficient than the distal end portion 61a and the proximal end portion 61b, for example, the same resin as the exterior members 52 and 53.

According to such a configuration, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the displacement absorbing portion 61c extends in the longitudinal direction N by substantially the same amount as the exterior members 52 and 53. This absorbs the displacement difference described above.

Further, when the temperature returns to room temperature, the displacement absorbing portion 61c compresses the exterior member 52 against the exterior member 53 by compressing the same in the longitudinal direction N by substantially the same amount as the exterior members 52 and 53. The same effect as in the embodiment can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 11 is a partial cross-sectional view schematically illustrating a configuration of an operation unit according to a modified example in which an outward flange that is in contact with a lid is provided on an outer periphery of a base end of the insertion unit in FIG. 8.

As shown in FIG. 11, an outward flange 2 s abutting on the lid 51 in the exterior member 52 may be provided on the outer periphery 2 eg of the base end 2 e of the insertion section 2.

According to such a configuration, when assembling the operation unit 4, the lid 51 may be fixed to the base end 2 e with the screw portion 51 w until the outward flange 2 s abuts on the lid 51.

From this, the mounting position in the longitudinal direction N of the lid body 51 can be easily and accurately defined without being affected by the mounting torque in the screw portion 51w.

The other effects are the same as those of the above-described embodiment.

Further, another modified example will be described with reference to FIG. FIG. 12 is a partial cross-sectional view schematically showing a state in which an O-ring between the lid and the exterior member in FIG. 8 is extended in the longitudinal direction.

As described in the above-described embodiment, the O-ring 56 is provided between the lid 51 and the exterior member 52.

In this case, the O-ring 56 may be bonded to the base end 51 b of the lid 51 and the front end 52 a of the exterior member 52.

According to this, when the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, even if the above-described displacement difference that cannot be completely absorbed by the elastic member 80 occurs, it is shown in FIG. Thus, the O-ring 56 extends in the longitudinal direction N. As a result, the O-ring 56 can absorb the displacement difference described above. The other effects are the same as those of the above-described embodiment.

Further, another modified example will be described below with reference to FIG. FIG. 13 is a partial cross-sectional view schematically illustrating a configuration of an operation unit according to a modification in which the internal components in FIGS. 2 and 8 are separated from the insertion unit.

As shown in FIG. 13, the built-in object 61 may not be fixed to the insertion section 2, but may be fixed only to the exterior member 53.

According to such a configuration, even if the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, since the built-in object 61 is fixed only to the exterior member 53, the exterior member 52 , 53 are less susceptible to expansion.

も With such a configuration, the same effects as those of the first and second embodiments can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 14 is a partial cross-sectional view schematically showing a configuration of an operation unit according to a modification in which a leaf spring is provided between the built-in component and the lid in FIG.

As shown in FIG. 14, a leaf spring 99 may be provided between the built-in member 61 and the lid 51 in the exterior members 52 and 53.

According to such a configuration, the path length of the internal member 60 in the longitudinal direction N is increased by the leaf spring 99.

When the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N at a high temperature, the above-described displacement is caused by the fact that the leaf spring 99 is extended in the longitudinal direction N by substantially the same amount as the exterior members 52 and 53. Absorb the difference.

Further, when the temperature returns to room temperature, the leaf spring 99 compresses the outer member 52 against the outer member 53 by compressing in the longitudinal direction N by substantially the same amount as the outer members 52 and 53. The same effect as in the second embodiment can be obtained.

Further, another modified example will be described below with reference to FIGS. FIG. 15 is a partial cross-sectional view schematically showing a configuration of an operation unit of a modification in which the direction of a fixing plate for fixing the built-in object to the exterior member of FIGS. 2 and 8 is inclined from the longitudinal direction. 15 is a cross-sectional view showing a modification in which a cushioning material is provided between the built-in member and the exterior member of FIG. 15, and FIG. It is a fragmentary sectional view showing the modification in which the rubber sheet was provided between the parts.

固定 As shown in FIG. 15, the fixing plate 64 may be formed integrally with the exterior member 53 and may be inclined at a predetermined angle with respect to the longitudinal direction N.

According to this, when the exterior members 52 and 53, the fixing plate 64, and the inner member 60 expand in the longitudinal direction N at a high temperature, the internal member 61 is fixed to the exterior member 53 at the fixing portion of the interior member 61 to the exterior member 53. The direction of the linear expansion load received from 53 can be shifted from the longitudinal direction N.

Therefore, the influence of the linear expansion load can be reduced as compared with the case where the built-in member 61 is fixed to the fixing plate 64 in the radial direction K substantially perpendicular to the longitudinal direction N.

Also, as shown in FIG. 16, by providing a cushioning material 101 containing a rubber sheet or particles between the built-in member 61 and the exterior member 53, even if the influence of the linear expansion load on the fixing portion is reduced, good.

Further, as shown in FIG. 17, a rubber sheet 103 is provided between the fixing plate 64 and the built-in object 61 and between the fixing plate 64 and the head of the fixing screw 140. As shown in FIG. May be reduced by the rubber sheet 103.

Further, another modified example will be described below with reference to FIG. FIG. 18 is a partial cross-sectional view schematically showing a configuration of an operation unit according to a modification in which the internal component is fixed to the exterior member in FIGS. 2 and 8 in the longitudinal direction.

As shown in FIG. 18, the built-in component 61 may be fixed to the exterior member 53 by a screw 105 in the longitudinal direction N to an inward flange 53 v formed at the tip of the exterior member 53.

According to this, the fixing direction of the built-in component 61 to the exterior member 53 is the same longitudinal direction N as the expansion direction of the exterior members 52 and 53.

From this, even if the exterior members 52 and 53 expand in the longitudinal direction N, the built-in object 61 also expands in the same direction, that is, the longitudinal direction N, so that the influence of the above-described displacement difference on the built-in object 61 is reduced.

Therefore, the same effects as in the first and second embodiments can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 19 is a partial cross-sectional view schematically showing a configuration of an operation unit of a modification in which the built-in components of FIGS. 2 and 8 are packaged.

内 蔵 As shown in FIG. 19, the built-in component 61 may be sealed in a high-strength package 107 or the like.

According to such a configuration, even if the exterior members 52 and 53 and the internal member 60 expand in the longitudinal direction N, the package 107 absorbs the load on the built-in component 61, and thus the influence of the above-described displacement difference on the built-in component 61. Is reduced.

Therefore, the same effects as in the first and second embodiments can be obtained.

Further, another modified example will be described below with reference to FIG. FIG. 20 is a partial cross-sectional view schematically illustrating a configuration of an operation unit having a modification in which an elastic member inserted between exterior members is formed longer in the longitudinal direction than in FIG. 8.

外 装 As shown in FIG. 20, in the longitudinal direction N, the exterior member 52 and the exterior member 53 do not have to abut, and the O-ring 57 does not have to be interposed therebetween.

Specifically, the distal end 53k of the exterior member 53 is fitted into the inner periphery on the base end side of the exterior member 52, and the exterior member 52 and the exterior member 53 in the longitudinal direction N are assembled with a space therebetween. I have.

Further, an elastic member 57 ′ elongated in the longitudinal direction N is provided between the outer periphery of the distal side 53 k in the radial direction K and the inner periphery of the base end side of the exterior member 52 so as to partially face the interval I. It may be inserted.

According to such a configuration, even if the exterior members 52 and 53 and the inner member 60 expand in the longitudinal direction N, the exterior member 52 only slides forward N1.

From the above, since the above-described displacement difference is absorbed by the interval I, the load applied to the fixing portion of the built-in member 61 to the exterior member 53 can be reduced.

密閉 Even if the exterior member 52 moves forward N1, the hermeticity with respect to the interior of the exterior member 50 is maintained by the elastic member 57 '.

Therefore, the same effects as in the first and second embodiments can be obtained.

変 形 Further, a modified example will be described below with reference to FIG. FIG. 21 is a partial cross-sectional view schematically showing a configuration of an operation unit having a modification in which an elastic member is provided behind a built-in component.

As shown in FIG. 21, the exterior member 150 may include a distal portion 151 on which the built-in member 160 is provided and a proximal portion 152 on which the displacement absorbing portion is provided.

The built-in member 160 provided in the exterior member 150 is composed of a distal portion 161 elongated in the longitudinal direction N and a proximal portion 162 having a substantially circular outer shape.

先端 A distal end 151a of the distal portion 151 is fixed to the distal portion 161 and a proximal portion 152 is fixed to the proximal end 151b of the distal portion 151.

変 位 A displacement absorbing portion 170 is provided in the inside 152i of the base end portion 152. The displacement absorbing section 170 includes a shaft 171 and a spring 110. The tip 171 of the shaft 171 is fixed to the built-in member 160.

The spring 110 is interposed between an outward flange 171 f formed at the base end of the shaft 171 and the tip end 152 a of the base end portion 152, and is constituted by a compression spring.

According to such a configuration, when the exterior member 150 and the built-in member 160 expand in the longitudinal direction N at a high temperature, the spring 110 is compressed in the longitudinal direction N to absorb the displacement difference described above.

From this, it is possible to reduce the load applied to the fixing portion of the built-in member 160 to the exterior member 150.

Further, another modified example will be described below with reference to FIG. FIG. 22 is a partial cross-sectional view schematically showing the configuration of an operation unit in a modification in which a collet chuck structure is provided in a base end portion of the exterior member of FIG. 21 when viewed from the IIXII direction in FIG.

As shown in FIG. 22, even when the base member 152 is not provided on the exterior member 150 and the displacement absorbing part 170 is not provided, the inside of the part 151 d of the exterior member 151 where the base portion 162 is provided is provided. , A known collet chuck structure may be provided.

Specifically, for example, three elastic members 115 are provided evenly in the circumferential direction between the outer peripheral surface of the base end portion 162 and the inner peripheral surface of the portion 151d. On the surface, for example, three collet chucks 180 are provided evenly in the circumferential direction.

According to such a configuration, the collet chuck 180 fixes the proximal portion 162 to the portion 151d under normal temperature use.

Also, under high temperature, the collet chuck 180 is separated from the base end portion 162 and the base end portion 162 is held only by the elastic member 115, so that the elastic member 115 prevents the outer member 151 and the built-in object 160 from expanding. The accompanying displacement difference described above can be absorbed.

FIG. 23 is a partial sectional view showing a conventional push switch structure together with an exterior member. By the way, as shown in FIG. 1, various push switches (hereinafter simply referred to as switches) 200 such as a remote switch 26 provided on the operation unit 4 penetrate through the exterior member 240 of the operation unit so as to penetrate the exterior member 240. It is fitted and fixed in a hole 241 formed along the direction H.

Specifically, as shown in FIG. 23, the switch 200 includes a pressing portion 201, a switch shaft 202 fixed to the pressing portion 201, and a fixing member 203 for fixing the pressing portion 201 to the hole 241. ing.

The pressing portion 201 is made of, for example, rubber, and is formed so as to have a concave shape that opens in the direction H <b> 2 that faces the inside of the exterior member 240 in the penetration direction H.

外 Further, an outward flange 201f is formed at an end of the pressing portion 201 in the direction H2. Further, a plurality of protrusions 201m that are in contact with the inner circumferential surface 240n of the hole 241 are formed on the outer circumferential surface 201g of the pressing portion 201.

The pressing portion 201 is fitted into the hole 241 from the direction H2 in the direction H1 opposite to the direction H2 to a position where the outward flange 201f contacts the inner surface 240t of the exterior member 240.

Thereafter, the fixing member 203 having a convex shape in the direction H1 is fitted into the pressing portion 201 until the flange 203f contacts the flange 201f, so that the pressing portion 201 is fixed to the hole 241 by the fixing member 203. Is done.

At this time, since the diameter of the outer peripheral surface 203g of the fixing member 203 is larger than the diameter of the inner peripheral surface 201n of the pressing portion 201, the protrusion 201m is pressed against the inner peripheral surface 240n. As a result, the pressing portion 201 is fixed to the hole 241 by the frictional force on the inner peripheral surface 240n of the protrusion 201m.

However, when the endoscope 1 is subjected to the autoclave sterilization, a high pressure is applied to the endoscope 1, so that an external pressure is also applied to the pressing portion 201 from the direction H1 to the direction H2.

As a result, the pressing portion 201 is pushed in the direction H2, the fixing member 203 is pushed in the direction H2, the fixing force of the pressing portion 201 by the fixing member 203 is reduced, and the function of the switch 200 is reduced. was there.

Therefore, there has been a demand for a switch configuration in which the fixed position in the direction H does not shift to the pressing portion 201 even when an external pressure is applied to the pressing portion 201 in the direction H2.

Hereinafter, configurations for preventing the displacement of the pressing portion 201 will be described with reference to FIGS.

FIG. 24 is a partial cross-sectional view showing a switch configuration in which the fixing member of FIG. 23 is provided with a locking portion that is locked to the pressing portion together with the exterior member.

As shown in FIG. 24, in this configuration, the switch 200 is formed at the end on the direction H2 side of the outer peripheral surface 201g of the pressing portion 201 and at the end of the inner peripheral surface 204n of the exterior member 240 on the direction H2 side. A recess 201k is formed to be locked to the projection 240d.

{Circle around (2)} The switch 200 has a configuration in which a locking portion 203p that is opposed to the flange 203f in the direction H and locked to the pressing portion 201 is provided at an end of the fixing member 203 on the direction H1 side. That is, the concave portion 201k is sandwiched between the locking portion 203p and the flange 203f in the direction H.

According to such a configuration, the frictional force of the fixing member 203 with respect to the pressing portion 201 is improved as compared with the configuration of the conventional switch 200 shown in FIG. 23, so that the displacement of the pressing portion 201 can be prevented.

FIG. 25 is a partial cross-sectional view showing a switch configuration in which the fixing member of FIG. 23 is fixed to the exterior member with screws, together with the exterior member.

As shown in FIG. 25, in this configuration, the flange 203f of the fixing member 203 is screw-fixed to the screw fixing member 244 fixed to the exterior member 240. Note that the screw fixing member 244 may be configured by fixing a plurality of members.

According to such a configuration, since the frictional force of the fixing member 203 with respect to the exterior member 240 is improved, the displacement of the pressing portion 201 can be prevented.

FIG. 26 is a partial cross-sectional view showing a switch configuration in which flanges are provided at both ends in the through hole direction of the pressing portion in FIG. 23 together with an exterior member.

As shown in FIG. 26, the pressing portion 201 has a flange 201f formed at an end on the direction H2 side in the direction H to be locked to the inner surface 240t of the exterior member 240, and an exterior member on the end on the direction H1 side. It has a configuration in which a flange 201q locked to the outer surface 240j of the 240 is formed.

That is, in the state where the pressing portion 201 is fitted into the hole 241, the outer member 240 is sandwiched in the direction H by the flange 201q and the flange 201f. Therefore, in this configuration, the fixing member 203 is not used.

も With such a configuration as well, the frictional force of the pressing portion 201 against the exterior member 240 is improved, so that the displacement of the pressing portion 201 can be prevented.

FIG. 27 is a partial cross-sectional view showing a switch configuration for fixing the outer peripheral surface of the fixing member of FIG. 23 to the inner peripheral surface of the pressing portion with an outer member together with the outer member.

ス イ ッ チ As shown in FIG. 27, the switch 200 has a configuration in which the outer peripheral surface 203 g of the fixing member 203 is screw-fixed to the inner peripheral surface 201 n of the pressing portion 201.

According to such a configuration, since the frictional force between the pressing portion 201 and the fixing member 203 is improved, the displacement of the pressing portion 201 can be prevented.

FIG. 28 is a partial cross-sectional view showing a switch configuration in which an insert member is insert-molded in the pressing portion of FIG. 23 together with an exterior member.

As shown in FIG. 28, in the switch 200, the insert member 300 is insert-molded in a position where the switch 200 is pressed against the inner peripheral surface 240n by the outer peripheral surface 203g of the fixing member 203 in the pressing portion 201.

According to such a configuration, even if the pressing portion 201 attempts to descend in the direction H2, the insert member 300 abuts on the protrusion 240d, so that the pressing portion 201 does not shift. That is, since the frictional force between the pressing portion 201 and the exterior member 240 is improved, the displacement of the pressing portion 201 can be prevented.

FIG. 29 is a partial cross-sectional view showing a switch configuration in which an insert member is insert-molded on the inner peripheral surface of the pressing portion in FIG. 23 together with an exterior member.

ス イ ッ チ As shown in FIG. 29, in the switch 200, an insert member 305 is insert-molded on the inner peripheral surface 201n of the pressing portion 201.

According to such a configuration, in the hole 241, since the insert member 305 sandwiches the pressing portion 201 between the outer member 240, the frictional force between the pressing portion 201 and the outer member 240 is improved. The displacement of the portion 201 can be prevented.

FIG. 30 is a partial cross-sectional view showing a switch configuration in which a snap-fit portion is provided in the pressing portion of FIG. 23 together with an exterior member.

ス イ ッ チ As shown in FIG. 30, the switch 200 has a configuration in which the snap-fit portion 210 provided in the pressing portion 201 is snap-fit fixed to the stepped hole 242 formed in the exterior member 240.

According to such a configuration, the snap-fit portion 210 snap-fitted and fixed to the stepped hole 242 can prevent the pressing portion 201 from being displaced.

FIG. 31 is a partial cross-sectional view showing a switch configuration in which a pressing portion is provided on the outer peripheral end of the fixing member of FIG. 23 together with an exterior member.

ス イ ッ チ As shown in FIG. 31, the switch 200 has a protruding pressing portion 203r formed at the end on the direction H1 side on the outer peripheral surface 203g of the fixing member 203.

According to such a configuration, since the pressing portion 203r presses the pressing portion 201 against the inner peripheral surface 240n, the frictional force between the pressing portion 201 and the exterior member 240 is further improved. Can be prevented.

In this configuration, it is preferable that the pressing portion 201 is made of a softer material such as silicone.

In addition, if the fixing member 203 is made of a material having a high linear expansion coefficient, the fixing member 203 expands in a high temperature environment such as an autoclave sterilization process, so that the pressing force using the pressing portion 203r can be further improved. .

FIG. 32 is a partial cross-sectional view showing a switch configuration in which the outer peripheral surface of the fixing member of FIG. 23 is formed in a tapered shape together with an exterior member.

ス イ ッ チ As shown in FIG. 32, the switch 200 is formed in a tapered shape in which the outer peripheral surface 203g of the fixing member 203 is inclined so as to decrease in diameter toward the direction H2.

According to such a configuration, since the pressing portion 201 is pressed against the inner peripheral surface 240n at the enlarged diameter portion on the side of the direction H1 in the outer peripheral surface 203g, the frictional force between the pressing portion 201 and the exterior member 240 is further improved. Therefore, it is possible to prevent the displacement of the pressing portion 201.

In this configuration, it is preferable that the pressing portion 201 is made of a softer material such as silicone.

Further, if the fixing member 203 is made of a material having a high linear expansion coefficient, the fixing member 203 expands under a high temperature environment such as an autoclave sterilization process, so that the pressing force using the enlarged diameter portion can be improved. .

FIG. 33 is a partial cross-sectional view showing a switch configuration in which a plurality of switch fixing members are connected and fixed by one holding member together with an exterior member.

As shown in FIG. 33, the plurality of switches 200 have a common pressing portion 201, and each pressing portion 201 fitted into each hole 241 of each switch 200 is fixed by a fixing member 203.

Furthermore, a holding member 207 fixed to the exterior member 240 and fixing the plurality of fixing members 203 collectively is provided.

According to such a configuration, by suppressing the movement of each fixing member 203 in the direction H2 by the member 207, as a result, the displacement of the pressing portion 201 can be prevented.

34 is a partial cross-sectional view showing a switch configuration formed by reducing the diameter of the end of the fixing member of FIG. 23 together with the exterior member, and FIG. 35 is a state in which the enlarged member of FIG. 34 is fitted into the fixing member. FIG.

As shown in FIG. 34, when the end of the fixing member 203 on the direction H1 side is formed to have a reduced diameter, as shown in FIG. 34, when the enlarged diameter member 220 is fitted into the fixing member 203 as shown in FIG. The diameter of the end of the fixing member 203 on the direction H1 side is expanded by the diameter expanding member 220, and the pressing portion 201 is pressed against the inner peripheral surface 240n.

In addition, as shown in FIG. 34, the end of the fixing member 203 on the side of the direction H1 is reduced in diameter, as shown in FIG. 32 described above, by changing the outer peripheral surface 203g of the fixing member 203 from the beginning in the direction H2. If the fixing member 203 is formed in a tapered shape as it goes toward, it is difficult to fit the fixing member 203 into the pressing portion 201 from the direction H2 to the direction H1.

も With such a configuration as well, the frictional force between the pressing portion 201 and the exterior member 240 is improved by the fixing member 203 whose diameter has been expanded by the diameter expanding member 220, so that the displacement of the pressing portion 201 can be prevented.

FIG. 36 is a partial cross-sectional view showing a switch configuration for fixing the holding member of FIG. 34 to a fixing member with a screw together with an exterior member.

As shown in FIG. 36, when the screw 220v is formed on the outer peripheral surface 220g of the holding member 220 and the holding member 220 is fitted into the fixing member 203, the switch 220 has the inner peripheral surface 203n of the fixing member 203 attached thereto. Is screwed.

Accordingly, the switch 200 has a configuration in which the fixing force of the holding member is increased with respect to the fixing member 203 so that the switch 200 can be fitted.

FIG. 37 is a partial cross-sectional view showing a switch configuration in which a stepped portion is provided in the pressing portion of FIG. 36 together with an exterior member, and FIG. 38 shows a state in which the holding member is fitted into the fixing member of FIG. 37 together with the exterior member. It is a partial sectional view.

As shown in FIG. 37, the switch 200 is provided at the position of the pressing portion 201 in contact with the inner peripheral surface 240n from the outer diameter T1 of the end on the direction H1 side of the fixing member 203 to the inner peripheral surface 201n of the pressing portion 201. The stepped portion 201x is formed so that the inner diameter T2 becomes larger.

According to such a configuration, as shown in FIG. 38, when the enlarged diameter member 220 is fitted into the fixed member 203, the end of the fixed member 203 on the direction H1 side is enlarged by the enlarged diameter member 220. Then, due to the stepped portion 201x, the outer diameter T1 'of the flange 203x provided at the end becomes larger than the inner diameter T2 (T1'> T2).

Therefore, since the pressing portion 201 is pressed against the inner peripheral surface 240n, the frictional force of the pressing portion 201 against the exterior member 240 is improved.

Furthermore, since the flange 203x is locked to the stepped portion 201x, the fixing member 203 does not easily fall off in the direction H2.

FIG. 39 is a partial cross-sectional view showing a switch configuration in which an E-ring is fitted to a position in the exterior member of the switch fixing member together with the exterior member.

ス イ ッ チ As shown in FIG. 39, in the switch 200, the fixing member 203 is insert-molded in the pressing portion 201, for example.

Further, when the switch 200 is inserted into the stepped hole 242 formed in the exterior member 240 from the direction H1 to the direction H2, the pressing portion 201 is crushed by being inserted into the large-diameter hole 242a, and becomes watertight. Is secured.

Further, the fixing member 203 is fixed by the E-ring 230 while being inserted into the exterior member 240 through the small-diameter hole 242b.

This prevents the switch 200 from falling out of the stepped hole 242 in the direction H1. In addition, the large-diameter hole 242a prevents the pressing portion 201 from falling in the direction H2.

FIG. 40 is a partial cross-sectional view showing a switch configuration in which a C-ring is fitted in a pressing portion together with an exterior member.

As shown in FIG. 40, in the switch 200, the concave portion 201k of the pressing portion 201 is engaged with the projection 240d, and the C ring 260 is fitted into the pressing portion 201 from the direction H2.

The 径 C ring 260 is deformed to be the same as or smaller than the inner diameter T3 of the protrusion 240d when the operator reduces the diameter of the protrusion 240d, and can be fitted into the pressing portion 201.

(4) After the C ring 260 is fitted, the pressing portion 201 is pressed against the inner peripheral surface 240n by expanding to an outer diameter T4 larger than the inner diameter T3 (T4> T3).

こ と This increases the frictional force between the pressing portion 201 and the exterior member 240, and thus can prevent the pressing portion 201 from being displaced. Therefore, in this configuration, the fixing member 203 becomes unnecessary.

FIG. 41 is a partial cross-sectional view showing a switch configuration in which a spacer is provided between the fixing member and the switch substrate in FIG. 23 together with an exterior member.

As shown in FIG. 41, the switch 200 has a configuration in which a cylindrical spacer 280 into which the switch shaft 202 is fitted is provided between the fixing member 203 and the switch substrate 270 in the direction H. I have.

According to this, since the fixing member 203 is prevented from falling in the direction H2 by the spacer 280, the pressing portion 201 is also prevented from falling in the direction H2.

FIG. 42 is a partial cross-sectional view showing a switch configuration in which a spring is provided between the fixing member and the switch board in FIG.

As shown in FIG. 42, the switch 200 has a configuration in which a spring 290 is provided between the fixing member 203 and the switch board 270 in the direction H.

According to this, similarly to the spacer 280, the spring 290 prevents the fixing member 203 from falling in the direction H2, and the spring 290 urges the fixing member 203 in the direction H1. Therefore, the pressing portion 201 is also prevented from falling in the direction H2.

This application is based on Japanese Patent Application No. 2018-133466 filed on July 13, 2018 as the basis for claiming priority, and the contents of the present application are described in the present specification, claims, and drawings. Is quoted.

Claims (5)

1. A plurality of exterior members abutted along the longitudinal axis,
   While provided in the exterior member, an internal member partially fixed to any of the plurality of exterior members, and made of a material having a different linear expansion coefficient from the exterior member,
   In the plurality of exterior members, a projection that is provided at a position different from a position where the part of the internal member is fixed in a direction along the longitudinal axis and projects radially inward of the exterior member,
   In the internal member, a facing portion facing the protrusion in a direction along the longitudinal axis,
   Along the longitudinal axis of the exterior member with respect to the internal member by applying heat to the exterior member and the internal member, the intermediate member is interposed between the protrusion and the opposed portion in a direction along the longitudinal axis. An elastic member that is deformed by a force generated in a direction along the longitudinal axis by relative expansion or relative contraction in a direction,
   An endoscope comprising:
2. The endoscope according to claim 1, wherein the exterior member is made of a material having a higher linear expansion coefficient than the inner member.
3. The endoscope according to claim 1, wherein the protrusion and the facing portion are formed in a circumferential shape.
4. The endoscope according to claim 3, wherein the elastic member is an O-ring.
5. The endoscope according to claim 3, wherein the elastic member is a spring.

Images