JPH06327614A - Device for bending operation of endoscope - Google Patents

Abstract

PURPOSE:To offer a device for bending operation of an endoscope which is attachable easily and firmly, with a coming-off stopper which does not cause wear after the attachment. CONSTITUTION:In the device for bending operation of an endoscope 13 which is provided with a fixed axis 18 protruding outside from the operation part of the endoscope, rotary tubes 22 and 23 fitted to this fixed axis 18 in a rotatable manner, and a coming-off stopper 103 equipped on the fixed axis 18 to prevent the rotary tubes 22 and 23 coming off from the fixed axis 18, and which causes the bending part provided in the insertion part of the endoscope to rotate by rotating the rotary tubes 22 and 23, the coming-off stopper 103 is equipped on the fixed axis 18 in such a manner as it cannot rotate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endoscope bending operation apparatus for bending a bending mechanism of an endoscope insertion section with an operation section.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Publication No. 63-9282, a bending mechanism provided at the distal end of an endoscope by rotating an endoscope bending operation device provided at an operation portion. There is a thing that bends. The bending operation device includes a fixed shaft projecting outward from an operation section of the endoscope, a rotary cylinder body rotatably fitted to the fixed shaft, and an outside of the operation section of the endoscope. The rotary knob includes an operation knob for rotating the rotary cylinder, and a rotational force transmission mechanism that connects the operation knob and the rotary cylinder to transmit the rotational force of the operation knob to the rotary cylinder.

Further, as a method for preventing the rotary cylinder from coming off from the fixed shaft, Japanese Patent Publication No. 4-21487 discloses that a fixed shaft is formed with an annular groove, and a U-shaped retaining ring ( It is disclosed that a retaining member) is fitted and the upper end of the rotary cylinder is brought into contact with the retaining ring. The retaining ring is held by a retaining ring provided around the retaining ring.

[0004]

However, the stop ring is adapted to be freely fitted in the fixed shaft in the radial direction, and is rotatable with respect to the annular groove. Therefore, when the retaining ring is fitted in the annular groove, the retaining ring rotates around the annular groove, which makes it difficult to fix the retaining ring, which makes subsequent assembly work difficult.

Further, between the inner circumference of the stop ring and the annular groove,
Also, there is a problem that wear occurs between the outer circumference of the stop ring and the disengagement prevention ring, the engagement of the stop ring becomes loose, and rattling or abnormal noise occurs between the annular groove and the disengagement prevention ring. was there.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an endoscope bending operation device having a retaining member that is easily and reliably attached and does not cause wear after attachment. To provide.

[0007]

In order to solve the above-mentioned problems, the present invention provides a fixed shaft projecting outward from an operating portion of an endoscope and a rotary cylinder rotatably fitted to the fixed shaft. A body and a retaining member provided on the fixed shaft to prevent the rotary cylinder from coming off the fixed shaft, and provided on the insertion portion of the endoscope by rotating the rotary cylinder. In the endoscope bending operation device for bending the bending portion, the retaining member is provided so as not to be rotatable with respect to the fixed shaft.

[0008]

A retaining member for retaining the bending operation member is attached to the fixed shaft so as not to rotate.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 7 show a first embodiment of the present invention. The electronic endoscope 1 shown in FIG. 2 includes a bending operation device 13 which is a first embodiment of the present invention.

As shown in the figure, the electronic endoscope apparatus 1 comprises an endoscope body composed of an insertion portion 9 to be inserted into a body cavity and an operation portion 8. A bending portion 10 that is bent by an operation of the bending operation device 13 and a distal end portion 15 connected to the distal end of the bending portion 10 are provided on the distal end side of the insertion portion 9, and the distal end portion 15 has an imaging function. Optical components such as an optical system and an illumination optical system are incorporated.

A bending operation device 13 is provided on the operation portion 8 so as to project therefrom, and an operator operates the bending operation portion 13 to remotely bend the bending portion 10 to orient the tip portion 15. Can be moved vertically and horizontally.

The insertion portion 9 is provided between the operation portion 8 and the insertion portion 9.
A break-preventing member 163 is provided in order to prevent the breakage and damage at the root portion. A universal cord 12 is connected to the operation unit 8. A light guide, a signal cable, etc. are arranged inside the universal cord 12, and the universal cord 12 is connected to a light source device 2 for supplying illumination light to the electronic endoscope 1 via a connector 11 at the tip thereof. There is. In addition, the universal cord 12 is the scope cable 1 extending from the connector 11.
It is electrically connected to the video processor 3 which processes the video signal transmitted from the electronic endoscope 1 via 62.
The video processor 3 includes a monitor 4 that displays a subject image based on the video signal processed by the video processor 3, a VTR 5 that records and reproduces the video signal, and a video printer 6 that prints the subject image based on the video signal. Video disk 7 which is a large-capacity storage device for recording video signals
And are electrically connected. The operation unit 8 includes switches 164 for remotely operating the video processor 3.
Is provided.

The bending operation device 13 is constructed as shown in FIG. That is, the substrate 17 is disposed and fixed to the casing body 16 forming the operation portion 8, and one end of the fixed shaft 18 is fixed to the substrate 17. The other end of the fixed shaft 18 is projected to the outside from a through hole 19 provided in the casing body 16. Further, a first sleeve 22 provided on the first operation knob 20 and a second sleeve 23 provided on the second operation knob 21 are rotatably and sequentially fitted on the outer periphery of the fixed shaft 18 in order. ing. A first sprocket 24 is provided at the inner end of the operating portion of the first sleeve 22. A second sprocket 25 is provided at the inner end of the operation portion of the second sleeve 23.
The first engagement groove 136 of the first sprocket 24 engages with the first engagement claw 134 provided on the first sleeve 22 to rotate integrally with the first sleeve 22. The second sprocket 25 is mounted so as to move, and the second engagement groove 137 of the second sprocket 25 engages with the second engagement claw 135 provided in the second sleeve 23 to make the second sprocket 25 move. It is attached so as to rotate integrally with the second sleeve 23.

Also, the first and second sprockets 2
A chain having wires (not shown) connected to both ends of 4, 4 and 25 is meshed and fixed. At this time, the first and second
The first and second engaging grooves 136, 137 of the sprockets 24, 25 of the
The chains 0, 21 are held in positions where they are engaged with the first and second engaging claws 134, 135 when the positions 0, 21 are at the center in the rotational direction. It is attached to the first and second sprockets 24, 25 so as to be at even positions. The wires (four wires in total) connected to these chains are connected to the bending portion 10 of the insertion portion 9, and by rotating the first sprocket 24, the bending portion 10 bends in the vertical direction, and the second By rotating the sprocket 25, the bending portion 1
0 is curved in the left-right direction.

The bearing 2 is provided in the through hole 19 of the casing body 16.
7 is provided through. The bearing 27 has its inner end portion fixed to the cover 26 covering the substrate 17, and is supported by the support shaft 28 which is clamped and fixed to the casing body 16 by screwing the support shaft fixing member 138. . Further, the support shaft fixing member 138 has a first O-ring 13 that keeps water-tightness between the support shaft fixing member 138 and the casing body 16.
9 and the second O for keeping the watertightness between the brake operating plate 56
A ring 140 is provided.

Next, the structure of the first operation knob 20 will be described with reference to FIG. The first operation knob 20 is composed of a first upper surface covering cover 49 and a first lower surface covering cover 53, which will be described later, and the first upper surface covering cover 49 covers the upper outer surface of the first operating knob 20. The first to make up
The housing member 29 of FIG.

The first containing member 29 is the first sleeve 2
By being fixed to 2, the cylindrical accommodation chamber 30 is formed. The storage chamber 30 has a first friction plate 3 on the upper surface.
A first friction member 32 to which 1 is attached and fixed is provided. The first friction member 32 is supported by a first plate spring 33 that is bent upward and is biased upward. The first leaf spring 33 is supported by the first support plate 34 fitted to the inner circumference of the first housing member 29 and the outer circumference of the first sleeve 22. The first support plate 34 has a first inner peripheral spline 3 on the inner peripheral surface.
It is supported by a second support plate 36 having a number 5.
Then, the annular adjustment member 38 is screwed into the threaded portion 37 formed on the inner peripheral surface of the first accommodating member 29,
The members 31, 32, 33, 34 are integrally housed and held in the housing chamber 30.

Further, the first friction member 32 and the first support plate 34 and the first support plate 34 and the second support plate 36 are engaged so as to rotate integrally. That is, the first friction member 32 and the second support plate 36 are integrally rotatable. Therefore, the adjusting member 38
When screwed into the housing member 29 of the first support plate 34 and the second support plate 34,
Of the first friction member 3
The urging force of the first leaf spring 33 that pushes up 2 to the upper side increases, and the pressure contact force between the first friction plate 31 provided on the upper surface of the first friction member 32 and the upper wall surface of the accommodating portion increases. That is, the frictional force of the first friction plate 31 can be arbitrarily adjusted by rotating the adjusting member 38.

A first mounting plate 40, which is non-rotatably supported by the brake shaft cylinder 39 and fixed by a fixing screw 148, is provided below the second support plate 36. A second mounting plate 41 rotatably supported by the brake shaft tubular body 39 is provided below the mounting plate 40. The first mounting plate 40 and the second mounting plate 41 form a brake mechanism. Is configured. The brake shaft tubular body 39 has one end rotatably fitted in the first sleeve 22. Further, the fixing screw 148 is biased upward by the fixing screw 167 and is firmly fixed to the brake shaft tubular body 39.

A protrusion 42 is formed on the outer peripheral surface of the first mounting plate 40.
(See FIG. 5) are provided. Further, as shown in FIG. 5, one ends of a belt-shaped locking spring 43 and a biasing spring 44 are fixed to the first mounting plate 40 by a fixing screw 165. Further, a regulating member 46 having an engaging recess 45 (see FIG. 5) is provided on the upper surface of the second mounting plate 41 located radially outside of the first mounting plate 40. This regulation member 4
6 is screwed and fixed to the second mounting plate 41 by a screw 47 penetrating from the lower side of the second mounting plate 41. Further, as shown in FIG. 5, the protrusion 42 of the first mounting plate 40 is engaged with the engagement recess 45 of the regulation member 46. Therefore, the second mounting plate 41 can rotate while the protrusion 42 contacts one end of the engagement recess 45 with the other end.

A locking spring 43 is provided on the upper surface of the second mounting plate 41.
And the pin 4 at the position corresponding to the other end of the biasing spring 44, respectively.
8 are erected. This pin 48 is the second mounting plate 41.
, And is screwed to the second mounting plate 41 from the lower side to the upper side.

A first upper surface covering cover 49 is fitted on the first accommodating member 29. A second inner peripheral spline 50 is formed on the inner peripheral surface of the first upper surface covering cover 49, and an outer periphery formed on the outer peripheral surfaces of the second inner peripheral spline 50 and the first accommodating member 29. The engagement with the spline 51 allows the first housing member 29 and the first sleeve 22 to integrally rotate when the first upper surface covering cover 49 is rotated.

A first lightening recess 52 is formed on the back surface of the first upper surface covering cover 49. Further, a first lower surface coating cover 53 is attached to the first upper surface coating cover 49 so as to cover the first lightening recessed portion 52. The first lower surface covering cover 53 includes the first sleeve 22.
The brake mechanism (consisting of the first mounting plate 40 and the second mounting plate 41) fitted to is held so as not to fall off. In this state, the first top cover and the first cover
A storage member 29, a first sleeve 22, a brake mechanism including a first mounting plate 40 and a second mounting plate 41,
The first lower surface covering cover 53 is integrated.

Further, the second mounting plate 41 is provided with an engaging portion 55 such as a notch so that the brake operating plate 56 and the second mounting plate 41 can rotate integrally. In addition, the protrusion 57 provided on the end of the brake operation plate 56.
Are engaged with the engaging portion 55. Also, the brake operation plate 5
Reference numeral 6 is rotatably fitted on the brake shaft tubular body 39.
In addition, the brake operation plate 56 and the first lower surface covering cover 5
O-ring 58 between the flange 59 provided on
Is attached, which ensures water tightness between the brake operating plate 56 and the first lower surface covering cover 53. Further, the O-ring 170 ensures watertightness between the first lower surface covering cover 53 and the containing member 29.

An operation lever 60 protruding from the brake operation plate 56 is integrally attached to the brake operation plate 56 by a fixing screw 171. The operation lever 60 is attached to the operation lever 60.
The brake operation plate 56 is rotated by the rotation operation of the
The mounting plate 41 can be rotated.

A resin operation knob 61 is provided at the tip of the operation lever 60, and a heat shrink tube 62 is coated on the middle portion of the operation lever 60. In the first operation knob 20, the first sleeve 22 is fitted into the support shaft 28 and the first sprocket 2 is inserted.
4 is fixed to the casing main body 16 of the operation portion 8. In this case, the brake shaft tubular body 39 provided on the first operation knob 20 is non-rotatably fitted onto the outer periphery of the upper end portion of the bearing 27. That is, the fitted hole 63 provided in the brake shaft tubular body 39 is formed into a square hole shape, and the fitted shaft 64 at the upper end portion of the bearing 27 is formed into a prismatic shape so that the fitted shaft 64 is fitted into the fitted hole 63. By engaging
The brake shaft tubular body 39 and the bearing 27 are non-rotatably fixed.

When the operating lever 60 is rotated in the direction of arrow A from the state of FIG. 5, the second lever is moved through the brake operating plate 56.
The mounting plate 41 rotates, and the pin 48 elastically deforms the other ends of the locking spring 43 and the biasing spring 44 in the axial direction. Further, when the second mounting plate 41 is in the state shown in FIG. 5, the other end of the locking spring 43 is engaged with the first inner peripheral spline 35 of the second support plate 36. By this engagement, the second support plate 36 is joined to the first mounting plate 40, and the rotation of the second support plate 36 is blocked. Therefore, when the operation knob 20 is rotated in this state, the frictional force generated between the first friction plate 31 and the first accommodating member 29 serves as resistance to rotation.

By the way, the operation lever 60 is restricted from rotating by a locking projection 141 provided on the casing body 16, and can be rotated by pulling up and deforming it so as to get over the locking projection 141. Become.

As shown in FIG. 5, on the upper surface of the first upper surface covering cover 49, there is provided a sign 152 which is a symbol or character indicating the operation direction or the like. The marking 152 is formed by engraving the surface of the first upper surface covering cover 49 and pouring the paint into the engraving hole. However, when the paint is poured into the engraving holes, excess paint is wiped off, surface tension, etc. Due to the influence of the above, when the paint dries, the paint at the center of the sign becomes concave and stains are likely to accumulate. Therefore, the engraving is provided only on the outer peripheral portion of the sign 153. Further, when it becomes difficult to engrave only the outer peripheral portion like the marking character 154, the center of the engraving is shallowly engraved to reduce the recessed portion of the paint during drying. Therefore, dirt is less likely to collect. The formation of the marking 152 is not limited to the first upper surface covering cover 49.

Next, the structure of the second operation knob 21 will be described with reference to FIG. As shown in the drawing, an annular second leaf spring 66 bent upward and a third support plate 68 having a second friction plate 67 provided on the upper surface are provided above the second accommodation member 65. Are housed so that they can be moved up and down in sequence. The second accommodation member 65 is prevented from coming off by a flange portion 69 provided on the second sleeve 23.
Further, a pressure contact plate 71 is provided on the upper surface side of the second friction plate 67 so as to be vertically movable, and a rectangular hole 70 is formed at the center of the pressure contact plate 71.

A second lower surface covering cover 72 is non-rotatably attached to the lower surface of the second accommodating member 65. That is, the lower surface of the second accommodating member 65 is formed in a substantially rectangular shape in which four sides of the circle are cut out, and the second lower surface covering cover 7 is formed.
2 a square groove is formed on the upper surface, and the second housing member 65 is formed in the square groove.
The second housing member 65 and the second lower surface covering cover 72 are non-rotatable by fitting the lower surface of the above. Further, in this case, the second lower surface covering cover 72 is supported by the first fixing member 73. That is, by screwing the first fixing member 73 onto the second sleeve 23,
The second lower surface covering cover 72 and the second containing member 65 and the first
And is fixed by being sandwiched between the fixing member 73 and the fixing member 73. At this time, the first fixing member 73 is provided with an O-ring 74 that keeps the second bottom surface covering cover 72 watertight and an O-ring 149 that keeps the first operation knob 20 watertight. Has been.

A second upper surface covering cover 75 having an opening at the center is provided on the upper surface of the pressure contact plate 71. The second upper surface covering cover 75 includes the second lower surface covering cover 7
2 is fixed. That is, the second upper surface covering cover 75 and the second lower surface covering cover 72 are meshed and fixed to each other by the stepped portions 76 provided on their entire circumferences. The stepped portion 76 is also provided on the second claw portion 77 (see FIG. 6) of the operation knob 21 formed by the second upper surface covering cover 75 and the second lower surface covering cover 72. The upper surface covering cover 75 and the second lower surface covering cover 72 are integrally rotated so as to prevent the deviation at the time of rotation and to bond the second upper surface covering cover 75 and the second lower surface covering cover 72 together. To increase the adhesive strength.

A second claw rib 78 is provided on the second claw portion 77 of the second lower surface covering cover 72, and the second claw rib 78 is the first claw rib 78 of the second upper surface covering cover 75. By engaging with the second lightening recessed portion 79 provided in the second claw portion 77, the shift of the second upper surface covering cover 75 and the second lower surface covering cover 72 during rotation is prevented.

A rib 80 projects from the second upper surface covering cover 75 along the entire circumference of the inner surface.
0 restricts the movement of the press contact plate 71 in the left-right direction, engages with the lower rib 101 projecting over the entire circumference from the second lower surface covering cover 72, and the second upper surface covering cover 75.
It also serves as a sealing surface of the O-ring 102 that keeps the space between the second lower surface cover 72 and the second lower surface cover 72 watertight.

The second operating knob 21 is provided with the second sleeve 2
By fitting 3 into the fixed shaft 18 and engaging with the second sprocket 25, the first operation knob 20 is mounted after being mounted, and the retaining member 103 prevents the stationary shaft 18 from coming off.

An O-ring 144 is provided between the inner peripheral surface of the second sleeve 23 and the fixed shaft 18, and the second operation knob 2 is rotated when the first operation knob 20 is rotated.
Second, the co-rotation phenomenon in which 1 rotates via the O-ring 149
It can be reduced by the frictional resistance generated between the sleeve 23 and the fixed shaft 18. Also, the O-ring 144
A ventilation groove 145 is provided between the fixed shaft 18 and the fixed shaft 18 so that the watertightness of the inside of a third operation knob 146 described later can be confirmed.

The fixed shaft 18 is provided with an engagement column 157 which is cut off on both sides of the fixed shaft 18 at a position corresponding to the upper end surface of the second operation knob 21, and above the engagement column 157. A brake adjusting screw portion 105 having a substantially prismatic shape is formed by cutting off a cylindrical screw from four sides. The retaining member 103 is fitted in the brake adjusting screw portion 105.

As shown in FIG. 6, the retaining member 103
Is formed into a substantially prismatic shape by cutting off four sides of a cylinder, and one side thereof has a length corresponding to the short side of the rectangular hole 70 provided in the press contact plate 71, and the engagement provided in the fixed shaft 18 Pillar 1
When the engaging groove 156 engaging with 57 is opened and the second operation knob 21 is attached to the fixed shaft 18, the engaging column 157 and the long hole 70 of the press contact plate 71 are aligned with each other, so that the fixed shaft is fixed. 18
Also, the press-contact plate 71 can be locked into the ring-shaped locking groove 104 such that it can be inserted into and removed from the long side direction of the rectangular hole 70, and cannot rotate.

Therefore, as described above, the retaining member 103 prevents the second operation knob 21 from coming off, and the retaining member 103 prevents the fixed shaft 18 and the pressure contact plate 71 from rotating.

On the other hand, the pressure contact plate 71 is pressed by the brake pressing mechanism that is rotatably screwed to the fixed shaft 18, and comes into pressure contact with the second friction plate 67. That is, the third lower surface covering cover 109 and the second fixing member 11
The friction force between the pressure contact plate 71 and the second friction plate 67 can be adjusted by the screwing amount of the brake pushing mechanism composed of 0 and the third mounting plate 111.

By the way, this brake pushing mechanism has a third
The lower surface covering cover 109 is supported by the second fixing member 110, and the second fixing member 110 and the third mounting plate 11
1 and 1 are screw-fixed so that they can rotate freely. The lower end of the second fixing member 110 projects from the lower end of the third lower surface covering cover 109, and the pressure contact plate 71 is pressed by the lower end of the second fixing member 110.
The fixed shaft 18 is screwed onto the brake adjusting screw 105 and the third screw.
The inner peripheral thread portion provided on the mounting plate 111 of FIG.

Further, an O-ring 114 is provided on the step portion 113 at the lower end of the third lower cover 109 to keep the space between the third operation cover 75 and the second operation knob 75 watertight, and the second fixing member. 110 is fitted on the outer periphery of the retaining member 103, and the inner peripheral surface thereof regulates the radial movement of the retaining member 103 to prevent the retaining member 103 from falling off.

Further, the brake adjusting screw portion 1 of the fixed shaft 18
On the upper portion of 05, there is provided a regulation plate engaging portion 115 having a prismatic shape smaller than the brake adjusting screw portion 105. Then, the regulation plate engaging portion 115 has a rotation regulation plate 118 having a rotation regulation groove 117 for regulating the rotation amount of the rotation regulation pin 116 screwed to the third mounting plate 111.
Is attached non-rotatably by a square hole provided in the center of the. The rotation restricting plate 118 has the restricting plate engaging portion 11
5 to the screw portion 119 provided on the upper part of the third fixing member 120
It is fixed by screwing. In this case, the third
The fixing member 120 is firmly fixed to the screw portion 119 while being urged upward by the set screw 121.

The frictional force generated when the pressing plate 71 and the second friction plate 67 are pressed into contact with each other by screwing the brake pushing mechanism into the fixed shaft 18 becomes the rotational resistance of the second operation knob 21. This rotation resistance is adjusted by the screwing amount of the brake pushing mechanism, but the rotation resistance of the second operation knob 21 is also regulated to a certain width by regulating the rotation amount of the brake pushing mechanism by the rotation regulating plate 118. It

Therefore, when the brake pushing mechanism is screwed into the fixed shaft 18 and a desired rotation resistance of the second operation knob 21 is obtained, the brake pushing mechanism is rotated at any one end of the rotation regulating groove 117. The restriction pin 116 is screwed and fixed in the fixing screw hole 122 provided on the entire circumference of the third mounting plate 111.

In this embodiment, the fixing screw hole 122 is used.
Are provided at 18 places, and the screwing amount of the brake pushing mechanism is 1/18 of the brake adjusting screw portion 105.
It can be adjusted for each mode. Of course, the more fixing screw holes 122 are provided, the finer the adjustment can be made.

When the brake adjusting screw portion 105 is a left-hand screw, the rotation regulating pin 116 has the maximum rotation resistance when fixed to the left end portion of the rotation regulating groove 117 when viewed from above, and the rotation resistance becomes the maximum value. For screws, the reverse is the minimum.

The upper surface of the third mounting plate 111 is elastically engaged with the rotation restricting pin 116 at its end when the brake pushing mechanism rotates within the range of the rotation restricting groove 117. A click spring 123 is provided.

On the other hand, the third lower surface covering cover 109 rotates with the rotation of the brake pushing mechanism, and the third claw portion 12
Position 4 is indeterminate. This third claw portion 124
Since, like the second claw 77, improves the operability of the third operation knob 146, the position of the claw needs to be positioned at a predetermined position.

At this time, as described above, since the third lower surface covering cover 109 is rotatably provided with respect to the brake pushing mechanism, it is possible to rotate the third lower surface covering cover 109. The third claw portion 124 can be moved to a predetermined position.

A screw fixing hole 125 is provided in the third lower surface covering cover 109 at a position corresponding to the fixing screw hole 122, and a fixing screw 126 screwed into the fixing screw hole 122 is rotated. It is screwed into the fixing screw hole 122 so as to pass through the second rotation restricting groove 127 provided in the restricting plate 118 and come into contact with the bottom surface of the screw fixing hole 125.

Therefore, the fixing screw 126 prevents the third lower surface covering cover 109 and the third mounting plate 111 from rotating, and the third claw portion 124 is fixed at a predetermined position.
Further, a third upper surface covering cover 128 is attached to the upper surface of the third lower surface covering cover 109 to cover the internal mechanism such as the rotation restricting plate 118. Third lower surface covering cover 1
An O-ring 129, which is prevented from coming out upward by a rotation restricting plate 118 provided on the third lower surface covering cover, is interposed between 09 and the third upper surface covering cover 128. The third upper surface covering cover 128 and the third lower surface covering cover 109 have a step portion 130 provided on the entire circumference thereof.
Are engaged and fixed by adhesion, forming a third operation knob 146.

At this time, the click spring 123 is prevented from falling off by the spring pressing portion 131 provided on the third upper surface cover 128. When the bending operation device 13 is disassembled, the third upper surface covering cover 128 and the set screw 1
21, the third fixing member 120 is removed, and the above-described assembly procedure is performed in reverse.
Since 8 is firmly fixed as described above, it takes time to remove it.

Upper surface 147 of third upper surface covering cover 128
Is thinner than the side surface, and is provided so as to abut the third fixing member 120 at a position where the deformation amount of the upper surface 147 does not exceed the elastic region of the upper surface 147, that is, a position where the upper surface 147 is not broken. There is. Therefore, since the upper surface 147 of the third upper surface covering cover 128 is thin, it is easily broken, and the bending operation device 13 is disassembled by breaking the upper surface 147 and removing the set screw 121 and the third fixing member 120. , Disassembling work is saved. On the other hand, with respect to an external force caused by a drop or the like, the third fixing member 120 is brought into contact with the third fixing member 120 to prevent the destruction.

By the way, the third operation knob 146 is shown in FIG.
The structure as shown in FIG. That is, the third upper surface covering cover 128 is screwed to the third lower frame covering cover 109, and the third lightening recessed portion 133 provided in the third lower surface covering cover 109 has a third portion. The claw member 150 is embedded and fixed, and forms the third claw portion 124. Further, a protective cover 15 made of an elastic material such as silicon rubber so as to cover the third lower surface covering cover 109, the third upper surface covering cover 128 and the third claw member 150.
1 is hooked and held by the third lower surface covering cover 109 to form a third operation knob 146.

With such a third operation knob 146, the protective cover 151 is removed, and the third lower surface covering cover 10 is removed.
By removing the third upper surface covering cover 128 from 9,
Since the set screw 121 and the third fixing member 120 are exposed without destroying the knob upper surface 147, disassembling work of the bending operation device 13 is further labor-saving. Also, the knob top surface 1
Since the 47 is not destroyed, the third top cover 128
Can be used repeatedly.

On the other hand, the upper surface 147 of the knob has a protective cover 151.
When the external force is applied to the knob upper surface 147, the protective cover 151 elastically absorbs the force and prevents the knob upper surface 147 from being damaged.

As described above, the bending operation device 13 bends the bending portion 10 in the vertical direction by rotating the first operating knob 20, and rotates the bending portion 10 in the left-right direction by rotating the second operating knob 21. Curved to the third operation knob 146
Control the rotation of the second operation knob 21 by rotating the
The operation lever 6 provided so as to project on the brake operation plate 56
The rotation operation of 0 controls the rotation of the first operation knob 20. Then, the first to third operation knobs 20, 21, 146
And the brake operating plate 56, the operating lever 60, and the casing body 16 have a watertight structure as shown below.
The inside of the operation unit 8 is also kept watertight between the outside and the outside.

FIG. 1 shows an assembled state of the bending operation device 13. The third operation knob 146 is kept watertight between the third upper surface covering cover 128 and the third lower surface covering cover 109 by the O-ring 129, and the second operating knob 2
1 is watertightly held between the second upper surface covering cover 75 and the second lower surface covering cover 72 by the O-ring 102, and the second lower surface covering cover 72 and the first fixing member 7 are provided.
3 and 3 are kept watertight by the O-ring 74,
The operation knob 20 is watertightly held by the O-ring 170 between the first upper surface covering cover 49 and the first lower surface covering cover 53.

Further, the third operation knob 146 and the second operation knob 21 are provided with an O-ring 114 provided between the third lower surface covering cover 109 and the second upper surface covering cover 75.
The second operation knob 21 and the first operation knob 20 are provided with an O-ring 149 provided between the first fixing member 73 and the housing member 29 so that the first operation knob 20 and the brake operation plate 56 have the first lower surface. By the O-ring 58 provided between the flange 59 provided on the cover 53 and the brake operating plate 56,
The brake operating plate 56 and the support shaft fixing member 138 are secured by O-rings 140, and the support shaft fixing member 138 and the casing body 16 are secured by O-rings 139 to ensure watertightness between the respective assembly parts.

As described above, according to the bending operation device 13 of the present embodiment, as shown in FIG. 9, by aligning the engagement post 157 and the engagement groove 156 of the retaining member 103, the disengagement is prevented. The rotation of the stopper member 103 is restricted, and in this state, the retaining member 103 can be laterally slid and fitted into the engagement column 157. As a result, the upper surface of the retaining member 103 and the upper surface of the engaging column 157 become the retaining wall 155, and the second retaining wall 159 on the lower surface of the retaining member 103 and the retaining end provided on the second operation knob 21. By abutting with 158 (see FIG. 4), members such as the first and second operation knobs 20 and 21 located below the retaining member 103 are rotatably fixed from the fixed shaft 18. That is, the retaining member 103 can be easily and reliably attached,
Moreover, since the retaining member 103 does not rotate after it is attached, wear of the retaining member 103 is prevented.

11 and 12 show a second embodiment of the present invention. The present embodiment is different from the first embodiment only in the shape of the retaining member and the structure around the fixed shaft into which the retaining member is fitted, and the other configurations are the same as those in the first embodiment.

A cylindrical annular locking groove 104, a part of which has a small diameter, is formed in the fixed shaft 18 at a position corresponding to the upper surface of the second operation knob 21 as compared with the engaging pillar 157 in the first embodiment. It is provided instead. A break adjusting screw portion 105 having a substantially prismatic shape is formed above the annular locking groove 104, as in the first embodiment.

A second retaining member 160 is fitted in the annular locking groove 104. Second retaining member 160
Like the retaining member 103 of the first embodiment, has a substantially prismatic shape in which four sides of a cylinder are cut off, and one side thereof corresponds to the short side of the rectangular hole 70 provided in the pressure plate 71. It has a release port 161 of a length corresponding to one side of the brake adjusting screw portion 105.

The second retaining member 160 has a U-shaped locking ring portion 1 which fits in the annular locking groove 104.
06, and an engaging ring portion 107 in the shape of a square hole into which the brake adjusting screw portion 105 is non-rotatably fitted.

Therefore, when the second operation knob 21 is attached to the fixed shaft 18, the direction of the opposite side of the brake adjusting screw portion 105 and the direction of the opposite side of the rectangular hole 70 of the press contact plate 71 coincide with each other. The retaining member 160 is configured such that the release port 161 is fitted to the fixed shaft 18 and the annular locking groove 104 from the long side direction of the rectangular hole 70, and the engaging ring portion 107 is fitted to the brake adjusting screw portion 105. Can be installed on.

In the second retaining member 160, the locking ring portion 106 is located lower than the engagement ring portion 107, and the annular locking groove 104 has the brake adjusting screw portion 10.
Since the diameter is smaller than 5, when attaching the second retaining member 160 to the fixed shaft 18, as shown in FIG. 8, a part of the engaging ring 107 is engaged with the brake adjusting screw portion 105. When the second locking wall 159 comes into contact with the locking end 158, the engaging ring portion 107 causes the brake adjusting screw portion 105 to rotate.
When it is slid sideways so as to be completely fitted in, the locking ring portion 106 fits in the annular locking groove 104. as a result,
The upper surface of the locking ring portion 106 and the upper surface of the annular locking groove 104 serve as a locking wall 155, and the first and second operation knobs 20 positioned below the second retaining member 160 are provided as in the first embodiment. , 21 and the like are rotatably fixed to the fixed shaft 18. As described above, according to the present embodiment, in addition to the same retaining effect as in the first embodiment, the attachment of the second retaining member 160 is easier.

[0068]

As described above, in the bending operation device of the present invention, the retaining member can be easily and surely attached, and the retaining member does not rotate after being attached. Wear of the stop member is prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bending operation device showing a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of an endoscope device including the bending operation device of FIG.

3 is a detailed cross-sectional view of a first operation knob of the bending operation device of FIG.

FIG. 4 is a detailed cross-sectional view of a second operation knob and a third operation knob of the bending operation device of FIG.

5 is a plan view of a first operation knob of the bending operation device in FIG. 1. FIG.

FIG. 6 is a plan view of a second operation knob of the bending operation device in FIG.

7 is a plan view of a third operation knob of the bending operation device in FIG. 1. FIG.

FIG. 8 is a plan view showing an attached state of a retaining member in the bending operation device according to the second embodiment of the present invention.

FIG. 9 is a perspective view showing a method for attaching the retaining member in the bending operation device according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a modified example of the third operation knob in the bending operation device according to the first embodiment of the present invention.

FIG. 11 is a perspective view showing a method for attaching a retaining member in the bending operation device according to the second embodiment of the present invention.

FIG. 12 is a cross-sectional view of essential parts near a second operation knob in the bending operation device according to the second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Endoscope, 8 ... Operation part, 9 ... Insertion part, 10 ... Bending part 13 ... Bending operation device, 18 ... Fixed shaft, 20, 21, 14
6 ... Operation knob, 22, 23 ... Sleeve (rotating cylinder) 10
3,160 ... retaining member.

Claims (1)

[Claims] 1. A fixed shaft protruding outward from an operating portion of an endoscope, a rotary cylinder rotatably fitted to the fixed shaft, and a rotary cylinder for preventing the rotary cylinder from coming off from the fixed shaft. In the endoscope bending operation device, the retaining member provided on the fixed shaft is provided, and the bending portion provided on the insertion portion of the endoscope is bent by rotating the rotating cylinder. An endoscope bending operation device, wherein a retaining member is provided so as not to be rotatable with respect to the fixed shaft.