JP4142391B2 - Brake force adjustment mechanism of endoscope bending operation device - Google Patents

Description

[0001]
【Technical field】
The present invention relates to the adjustment of the braking force of the endoscope bending operation device, which can arbitrarily adjust the braking force for preventing the operation device for performing the bending operation of the bending portion of the endoscope from malfunctioning. Regarding the mechanism.
[0002]
[Prior art and its problems]
Usually, an insertion portion of an endoscope is formed with a bending portion that can be bent vertically and horizontally, and this bending portion is operated by turning a bending operation device provided in the operation portion. It has become. Further, the operation unit is provided with a lock operation unit. When the lock operation unit is moved to the lock position, the brake pad fixed to the bending operation device comes into pressure contact with the friction member fixed to the operation unit side. The operation of the bending operation unit becomes impossible due to the braking force generated between the brake pad and the friction member.
For this reason, if the lock operation part is moved to the lock position in advance, the bending state of the bending part can be maintained in that state even if the operator's hand or the like accidentally contacts the bending operation device (for example, Patent Document 1, Patent Document 2, and Patent Document 3).
Further, the operation unit is provided with an adjustment mechanism for adjusting the brake force so that the operator can easily use the brake function (see Patent Documents 1 and 2).
[0003]
However, when the adjustment mechanism is provided in this way, there is a possibility that the brake may not be effective when a large force is applied to the bending operation device with the brake applied.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 63-29537 [Patent Document 2]
JP-A-6-327613 [Patent Document 3]
Japanese Patent Laid-Open No. 4-8340
OBJECT OF THE INVENTION
An object of the present invention is to provide a brake force adjusting mechanism for an endoscope bending operation device that does not cause the brake to be ineffective even when a large force is applied to the bending operation device with the brake applied.
[0006]
SUMMARY OF THE INVENTION
The brake force adjusting mechanism of the endoscope bending operation device according to the present invention includes an insertion portion that is inserted into an observation target, a bending operation member that bends the distal end of the insertion portion in accordance with forward and reverse rotation operations, A lock operation member that is coaxial with the bending operation member and can be independently rotated, and the lock operation member and the bending operation member without rotation in conjunction with forward and reverse rotation operations of the lock operation member A linearly moving member that reciprocates linearly in a direction along the rotation axis, and is screwed into the linearly moving member, and comes into contact with and separates from the bending operation member as the linearly moving member linearly moves. An adjustment ring that restricts or allows rotation, a slit in the circumferential direction formed in the adjustment ring, and the first and second deformed portions formed by sandwiching the slit by the slit are relatively brought into and out of contact with each other. And a holding member that changes the width of the slit. It is characterized by a door.
[0007]
The holding member may be a set screw that penetrates the first deformable portion and is screwed into a screw hole formed in the second deformable portion.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the present embodiment, the present invention is applied to an operating device for a medical endoscope.
First, the overall structure of the endoscope and the outline of the operation device will be described.
[0009]
The endoscope 10 shown in FIG. 1 has an operation unit 11 and an insertion unit 12, and the distal end of the insertion unit 12 is bent in the vertical and horizontal directions in accordance with the operation of the bending operation device 13 provided in the operation unit 11. The curved portion 12a is formed.
[0010]
An observation window (object window) and an illumination window (not shown) are provided at the distal end of the curved portion 12a. An image obtained through the observation window can be observed from an eyepiece unit 15 provided in the vicinity of the operation unit 11. Illumination light is sent from the light source device 17 connected to the connector 14 to the illumination window at the distal end of the curved portion 12a through the light guide flexible tube. A forceps port 18 for inserting a treatment tool is provided between the operation unit 11 and the insertion unit 12, and the treatment tool inserted from the forceps port 18 protrudes from the distal end of the bending portion 12a.
[0011]
FIG. 2 shows a cross section near the bending operation device 13. The bending operation device 13 includes a left / right bending mechanism 13LR for bending the bending portion 12a in the left / right direction and an up / down bending mechanism 13UD for bending the bending portion 12a in the up / down direction.
First, the left / right bending mechanism 13LR will be described.
[0012]
A substrate 11b is fixed in the housing 11a of the operation unit 11, and the rotation base shaft 20 is fixed on the substrate 11b. The rotation base shaft 20 protrudes upward through a through hole 11c formed in the housing 11a. The through hole 11c is closed by a lid 11d disposed between a fixed base 60 and a housing 11a, which will be described later.
[0013]
On the outer side of the rotation base shaft 20, an operation shaft body 21 constituting a left / right bending mechanism 13LR is rotatably supported. The operation shaft body 21 is a cylindrical member that is fitted on the rotation base shaft 20 and is concentric with the rotation base shaft 20 and is made of a metal material. An annular bottom plate 22 having a circular hole 22a in the center is fixed to the outer peripheral surface of the upper end portion of the operation shaft body 21, and the bottom plate 22 rotates integrally with the operation shaft body 21. Can do.
[0014]
A large-diameter opening 23b drilled in the lower surface of a bending operation knob (bending operation member) 23, which is a plastic molded product, is fitted and fixed to the bottom plate 22. The bending operation knob 23 has four finger hooks 23a protruding in the outer diameter direction at equal angular intervals, and the inside is formed hollow. On the upper surface of the bending operation knob 23, a small-diameter opening 23c facing the large-diameter opening 23b is formed.
[0015]
A pulley 24 is fixed to the lower end portion of the operation shaft body 21. A pair of operation wires 25 and 26 are fixed to the pulley 24, and one of the operation wire 25 and the operation wire 26 is wound around the pulley 24 by the forward / reverse rotation of the pulley 24, and the other is drawn out from the pulley 24. It is. The operation wire 25 and the operation wire 26 are respectively connected to a node ring constituting the bending portion 12a of the insertion portion 12, and the bending portion 12a is bent in the left-right direction by the pulling and feeding operations with respect to the operation wire 25 and the operation wire 26. Is done.
In the present embodiment, when the combined body of the bending operation knob 23 and the operation shaft body 21 is rotated in the L direction in FIG. 1, the bending portion 12a is bent leftward, and when the combined body is rotated in the R direction. The bending portion 12a is bent to the right.
[0016]
Next, the vertical bending mechanism 13UD will be described.
On the outside of the operation shaft body 21, an operation shaft body 31 that constitutes the vertical bending mechanism 13UD is rotatably supported. The operation shaft body 31 is made of a metal material, and is fitted to the operation shaft body 21 so as to be rotatable. A cylindrical portion 31a concentric with the rotation base shaft 20, and a circle positioned at the upper end portion of the cylindrical portion 31a. It has a plate-like portion 31b.
[0017]
A small-diameter opening 33b drilled in the upper surface of a bending operation knob (bending operation member) 33, which is a plastic molded product, is fitted and fixed to the operation shaft body 31. The bending operation knob 33 has five finger hook portions 33a protruding in the outer diameter direction at equal angular intervals, and the inside is formed hollow. On the lower surface of the bending operation knob 33, a large-diameter opening 33c facing the small-diameter opening 33b is formed.
[0018]
A pulley 34 is fixed to the lower end portion of the operation shaft body 31. A pair of operation wires 35, 36 are fixed to the pulley 34, and one of the operation wire 35 and the operation wire 36 is wound around the pulley 34 by the forward / reverse rotation of the pulley 34, and the other is drawn out from the pulley 34. It is. The operation wire 35 and the operation wire 36 are respectively connected to the bending portion 12 a of the insertion portion 12, and the bending portion 12 a is bent in the vertical direction by the pulling and feeding operations with respect to the operation wire 35 and the operation wire 36. In the present embodiment, when the combined body of the bending operation knob 33 and the operating shaft body 31 is rotated in the U direction in FIG. 1, the bending portion 12a is bent upward, and when the combined body is rotated in the D direction, the curved portion is bent. The portion 12a is bent downward.
[0019]
The left / right bending mechanism 13LR and the up / down bending mechanism 13UD can each regulate the turning operation of the bending operation knobs 23 and 33 by a lock mechanism, and the lock portion can cause the bending portion 12a of the insertion portion 12 to be in a desired bending state. Can be held in.
First, the lock mechanism of the left / right bending mechanism 13LR will be described.
[0020]
A lock shaft body 41 having a cylindrical portion 41 a and a disc-like portion 41 b concentric with the rotation base shaft 20 is provided at the upper end portion of the rotation base shaft 20. The cylindrical portion 41a is fitted to the rotation base shaft 20 so as to be rotatable, and a lock operation knob (lock operation member) 42 is fixed on the disk-shaped portion 41b via a fixing nut 43. When the lock operation knob 42 is turned, the lock shaft body 41 also rotates together. A retaining member 44 is attached to the upper end portion of the rotating base shaft 20 to prevent the combined body of the lock shaft body 41 and the lock operation knob 42 from dropping off from the rotating base shaft 20. The fixing screw 20a is fixed so as not to drop off in the axial direction of the rotation base shaft 20.
[0021]
The combined body of the lock shaft body 41 and the lock operation knob 42 has a pair of rotation restricting projections (not shown) provided on the disc-like portion 41b and provided on the retaining member 44 at different positions in the circumferential direction. The rotation can be made within a range of contact with a rotation regulating surface (not shown). The retaining member 44 is further formed with a pair of click recesses (not shown) at positions opposed to the respective rotation restricting surfaces in the radial direction, and the rotation restricting projections abut against the respective rotation restricting surfaces. In the rotation restricting position of the lock operation knob 42 and the lock operation knob 42, a click spring (not shown) fixed to the lock operation knob 42 engages with a click recess (not shown) at a radially opposed position to lock the lock operation knob 42. A click feeling is given to the operation knob 42.
[0022]
An inner diameter hole of the annular mounting member 45 is fitted and fixed to the lower end portion of the lock shaft body 41. Female screw holes 45a are formed at two locations on the outer peripheral surface of the mounting member 45 with the circumferential phase shifted by 180 degrees, and the male screws 46a of the cam pins 46 are screwed into the female screw holes 45a.
[0023]
In the vicinity of the upper end portion of the rotation base shaft 20, an annular fixing member 47 that cannot be rotated relative to the rotation base shaft 20 and moved in the axial direction (vertical direction) is fixed. Further, a substantially cylindrical brake member 48 is mounted on the outer peripheral surface of the fixing member 47 so as not to rotate relative to the fixing member 47 and to be movable in the axial direction (vertical direction).
As shown in FIG. 3, two cam grooves 49 are formed in the outer peripheral surface of the brake member 48 with a phase shifted by 180 degrees, and the cam pins 46 are engaged with the cam grooves 49, respectively. .
[0024]
As shown in FIG. 4, each cam groove 49 has a narrow inclined groove 49A formed over a certain length, and circular click holes 49B provided at both left and right ends of the inclined groove 49A. 49C, and the diameter of the click hole 49B is set larger than the width of the inclined groove 49A. One click hole 49B is formed with an elongated notch 49D communicating with the upper end surface of the brake member 48, and the other click hole 49C is continuously formed with a narrow groove 49E facing in the circumferential direction. ing. In this manner, by forming the click holes 49D and 49E in the brake member 48, appropriate elasticity is imparted to the peripheral portion of the cam groove 49.
[0025]
A bottomed cylindrical male screw ring (linear movement member) 50 is located on the outer peripheral side of the brake member 48, and a flange 50 a is fixed to the bottom surface of the brake member 48 by a set screw 51. A male screw groove 50b (thread groove) is formed in the outer peripheral surface of the male screw ring 50, and a female screw groove (thread groove) 52a of an annular adjustment ring 52 shown in FIG. is doing.
As shown in FIG. 5, the adjustment ring 52 has slits 52b facing in the circumferential direction, and female screw holes (screw holes) 52c are drilled at two locations on the bottom surface of the slit 52b, and the upper surface of the slit 52b. A communication hole 52d that communicates the slit 52b and the upper surface of the adjustment ring 52 is formed at a position facing the female screw hole 52c.
As shown in FIGS. 2 and 3, a set screw (holding member) 53 passing through the communication hole 52d is screwed into the female screw hole 52c.
[0026]
An annular friction member 55 is fixed to a portion of the upper surface of the bottom plate 22 facing the adjustment ring 52. The friction member 55 is formed of a material having a large friction coefficient such as cork or silicon rubber.
[0027]
In the locking mechanism on the side of the left and right bending knob 23 having such a configuration, when the lock operation knob 42 is rotated in the counterclockwise direction in FIG. 1, the mounting member 45 integrated therewith also has the same angle in the same direction. The cam pin 46 rotates in the same manner. Since the brake member 48 in which the cam groove 49 is formed is not rotatable relative to the rotation base shaft 20 and is capable of relative movement in the axial direction, the cam pin 46 located in the click hole 49B is moved into the inclined groove. When moving toward the click hole 49C side in 49A, the brake member 48 is pushed down relative to the cam pin 46, and the lower surface of the adjusting ring 52 comes into pressure contact with the upper surface of the friction member 55. Brake force is generated in the meantime. When the bending operation knob 23 is further rotated, the cam pin 46 is fitted into the click hole 49C, and the bending operation knob 23 cannot be further rotated.
As described above, since the peripheral portion of the cam groove 49 is given elasticity, when the cam pin 46 passes through the inclined groove 49A, there is an appropriate resistance between the cam pin 46 and the inclined groove 49A. As a result, the operator can operate the lock operation knob 42 comfortably.
[0028]
Accordingly, when the lock operation knob 42 is rotated counterclockwise in a state where the bending portion 12a is bent in a desired bending shape, the bending operation knob 23 is prevented from rotating by the above-described brake force. The portion 12a cannot be bent in the left-right direction. Therefore, even if the operator's hand or the like accidentally contacts the bending operation knob 23, the bending state of the bending portion 12a can be maintained as it is.
[0029]
Further, when the adjustment ring 52 is rotated to change the screwing amount of the adjustment ring 52 and the brake member 48, the lock operation knob 42 is unlocked (the lock when the cam pin 46 is located in the click hole 55B). Since the distance between the adjustment ring 52 and the friction member 55 at the position of the operation knob 42 is changed, the lock operation knob 42 is locked when the cam pin 46 is positioned in the click hole 55C. The brake force when the knob 42 is rotated in the direction) changes. Therefore, the brake force can be adjusted by rotating the adjustment ring 52.
For example, even when the bending portion 12a is in a bending state, when the external force applied to the bending portion 12a is larger than a predetermined value, the lock to the bending operation knob 23 is released by the external force, so that a half lock is achieved. It is also possible to set the frictional force between the adjusting ring 52 and the friction member 55.
[0030]
Further, as shown in FIG. 6, when the tightening amount of the set screw 53 is increased after adjusting the vertical position of the adjustment ring 52, the female screw groove of the upper portion (first deformed portion) 52 e of the slit 52 b of the adjustment ring 52. The lower surface of 52a is pressed against the upper surface of the male screw groove 50a, and the upper surface of the female screw groove 52a of the lower portion (second deformed portion) 52f of the slit 52b is pressed against the lower surface of the male screw groove 50a. When the male screw ring 50 and the adjustment ring 52 are in such a screwed state, the adjustment ring 52 is firmly fixed to the male screw ring 50, so that the adjustment ring 52 and the friction member 55 are in contact (the brake force is generated). In this state, even if a large force is unexpectedly applied to the bending operation knob 23 and a large rotational force is applied to the adjustment ring 52 from the friction member 55, the adjustment ring 52 is rotated relative to the male screw ring 50 by this rotational force. In addition, the braking force between the adjusting ring 52 and the friction member 55 does not decrease, and the bending state of the bending portion 12a is maintained as it is.
[0031]
Next, the lock mechanism of the up / down bending mechanism 13UD will be described.
A fixed pedestal 60 formed in a cylindrical shape concentric with the rotation base shaft 20 is provided outside the operation shaft body 31. The fixed pedestal 60 has its lower end fixed to the substrate 11b together with the pivot base 20, and in the space between the fixed pedestal 60 and the pivot base 20, operation shaft bodies 21, 31 and pulleys 24, 34 are provided. It is supported. On the other hand, a lock shaft body 61 is supported on the outer peripheral surface of the fixed base 60. The lock shaft 61 includes a cylindrical portion 61a and a disc-shaped portion 61b concentric with the rotation base shaft 20, and the cylindrical portion 61a is rotatable with respect to the outer peripheral surface of the fixed base 60 and is axially (vertical) (Direction) so as not to move. A lock operation lever (lock operation member) 62 is fixed to the disc-shaped portion 61b, and the lock operation lever 62 can rotate around the fixed base 60 (the rotation base shaft 20) together with the lock shaft body 61. It has become. Unlike the above-described hollow lock operation knob 42, the lock operation lever 62 is formed in a lever shape extending in the radial direction with respect to the axis of the rotation base shaft 20 in order to facilitate the rotation operation. Has been.
[0032]
The lower surface of the annular mounting member 63 is fixed to the upper surface of the lock shaft body 61. Female screw holes 63a are formed at two locations on the outer peripheral surface of the mounting member 63 with the phase in the circumferential direction shifted by 180 degrees, and male screws 64a of cam pins 64 are screwed into both female screw holes 63a.
[0033]
A substantially cylindrical brake member 65 is attached to the upper end portion of the outer peripheral surface of the fixed base 60 so as not to rotate with respect to the fixed base 60 and to be movable in the axial direction (vertical direction). The brake member 65 is formed with two cam grooves 66 having the same shape as the brake member 48 with a phase shifted by 180 degrees, and the cam pins 64 are engaged with the cam grooves 66, respectively.
[0034]
An outward annular flange 65a protrudes from the lower end of the brake member 65, and a bottomed cylindrical male screw ring (linear movement member) 67 is fixed to the upper surface of the annular flange 65a. A male screw groove 67a is formed in the outer peripheral surface of the male screw ring 67, and a female screw groove 68a of an adjustment ring 68 having a slightly larger diameter than the adjustment ring 52 is screwed into the male screw groove 67a. The adjustment ring 68 is formed of the same material as the adjustment ring 52, and is provided with the same slit 68b, female screw hole 68c, and communication hole 68d as the adjustment ring 52. A set screw (holding member) 69 passing through the communication hole 68d is screwed into the female screw hole 68c.
[0035]
An annular bottom plate 70 is fitted and fixed to the large-diameter opening 33 c of the bending operation knob 33, and the inner diameter hole 54 of the bottom plate 70 is rotatably supported by the lock shaft body 61. Further, an annular friction member 71 made of a material having a large friction coefficient such as cork or silicon rubber is fixed to a portion of the upper surface of the bottom plate 70 facing the adjustment ring 68.
[0036]
In the locking mechanism on the up and down bending knob 33 side having such a configuration, when the lock operating lever 62 is rotated counterclockwise in FIG. 1, the cam pin 64 rotates in the same direction by the same angle, and this movement Accordingly, the brake member 65 is pushed down relative to the cam pin 64, the lower surface of the adjustment ring 68 is pressed against the upper surface of the friction member 71, and a braking force is generated between the members 68 and 71. Before the bending operation knob 33 is rotated, the cam pin 64 is positioned in one click hole. However, when the bending operation knob 33 is rotated as described above, the cam pin 64 is moved to the other click hole (not shown). ) And the bending operation knob 33 cannot be further rotated.
[0037]
Accordingly, when the lock operation knob 42 is rotated counterclockwise in a state where the bending portion 12a is bent into a desired bending shape, the bending operation knob 33 is prevented from rotating by the above-described braking force, so that the bending operation knob 33 is bent. The portion 12a cannot be bent in the vertical direction. Therefore, even if the operator's hand or the like accidentally contacts the bending operation knob 33, the bending state of the bending portion 12a can be maintained as it is.
[0038]
Further, when the adjustment ring 52 is rotated to change the screwing amount of the adjustment ring 68 and the brake member 65, the bending operation knob 33 is unlocked (when the cam pin 64 is located in the one click hole). Since the distance between the adjustment ring 68 and the friction member 71 when the lock operation lever 62 is at the position changes, the lock operation lever 62 is moved to the lock position (when the cam pin 64 is positioned in the other click hole). The braking force changes when the locking operation lever 62 is rotated in the direction). Therefore, by rotating the adjusting ring 68, the braking force can be adjusted. For example, the frictional force between the adjusting ring 68 and the friction member 71 can be set so as to be half-locked.
[0039]
Further, when the amount of tightening of the set screw 69 is increased after adjusting the position of the adjusting ring 68, the upper portion (first deformed portion) 68e of the slit 68b of the adjusting ring 68, as in the case of the adjusting ring 52 described above. The lower surface of the female screw groove 68a is pressed against the upper surface of the male screw groove 67a, and the upper surface of the female screw groove 68a of the lower portion (second deformed portion) 68f of the slit 68b is pressed against the lower surface of the male screw groove 67a. When the male screw ring 67 and the adjustment ring 68 are in such a screwed state, the adjustment ring 52 is firmly fixed to the male screw ring 50, so that the adjustment ring 68 and the friction member 71 are in contact with each other (braking force is generated). In this state, even if a large force is unexpectedly applied to the bending operation knob 33 and a large rotational force is applied to the adjustment ring 68 from the friction member 68, the adjustment ring 68 is rotated relative to the male screw ring 67 by this rotational force. Then, the braking force between the adjusting ring 68 and the friction member 71 is not reduced, and the bending state of the bending portion 12a is maintained as it is.
[0040]
The constituent members of the left / right bending mechanism 13LR and the up / down bending mechanism 13UD having the lock mechanism as described above are finally assembled to the operation unit 11 via the rotation base shaft 20. The vertical bending mechanism 13UD is positioned between the operation shaft body 21 (disk-shaped portion 21b) and the pulley 24 constituting the left / right bending mechanism 13LR, and the vertical position is determined. Is provided with an intermediate retaining member 72 that engages with the upper end of the operating shaft 21. The intermediate retaining member 72 holds the entire vertical bending mechanism 13UD and the combined body of the operation shaft body 21 and the bending operation knob 23 in the left and right bending mechanism 13LR so as not to drop off from the rotation base shaft 20.
[0041]
In the present embodiment, the upper and lower portions of the adjustment rings 52 and 68 are brought close to each other by the set screws 53 and 69, but the female screw holes 52c and 68c are provided in the upper portion, and the communication holes 52d are provided in the lower portion. 68d may be formed, and the upper and lower portions may be separated by the set screws 53 and 69. In this way, the adjustment rings 52 and 68 can be firmly fixed to the male screw rings 50 and 67.
[0042]
【The invention's effect】
According to the present invention, it is possible to obtain a brake force adjusting mechanism of an endoscope bending operation device that does not cause the brake to be ineffective even when a large force is applied to the bending operation device with the brake applied.
[Brief description of the drawings]
FIG. 1 is an external view showing an overall structure of an endoscope having an operating device according to the present invention.
2 is a cross-sectional view of the vicinity of the bending operation device of the endoscope of FIG. 1; FIG.
FIG. 3 is a longitudinal sectional view showing a state in which a brake member, a male screw ring, and an adjustment ring are coupled to each other.
FIG. 4 is a development view of a brake member.
FIG. 5 is an enlarged perspective view of an adjustment ring.
FIG. 6 is an enlarged longitudinal sectional view of a threaded portion of the male screw ring and the adjustment ring.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Endoscope 11 Operation part 11a Housing 11b Board | substrate 11c Through-hole 11d Cover body 12 Insertion part 12a Bending part 13 Bending operation apparatus 13LR Left and right bending mechanism 13UD Vertical bending mechanism 14 Connector 15 Eyepiece part 17 Light source apparatus 18 Forceps port 20 Rotation Base shaft 21 Operation shaft body 22 Bottom plate 22a Circular hole 23 Bending operation knob (bending operation member)
23a Finger hook part 23b Large diameter opening 23c Small diameter opening 24 Pulley 25 Operation wire 26 Operation wire 31 Operation shaft body 31a Tubular part 31b Disk-like part 31c Circular hole 33 Bending operation knob (bending operation member)
33a Finger hook portion 33b Small diameter opening 33c Large diameter opening 34 Pulley 35 Operation wire 36 Operation wire 41 Lock shaft body 41a Cylindrical portion 41b Disk-shaped portion 42 Lock operation knob (lock operation member)
43 fixing nut 44 retaining member 45 mounting member 45a female screw hole 46 cam pin 46a male screw (power transmission mechanism)
47 Fixed member 48 Brake member 49 Cam groove 49A Inclined groove 49B Click hole 49C Click hole 49D Notch 49E Narrow groove 50 Male thread ring (linear movement member)
50a Flange 50b Male thread groove (thread groove)
51 Set screw 52 Adjustment ring 52a Female thread groove (thread groove)
52b Slit 52c Female thread hole (screw hole)
52d Communication hole 52e Upper part (first deformation part)
52f Lower part (second deformation part)
53 Set screw (holding member)
55 Friction member 60 Fixed base 61 Lock shaft body 61a Cylindrical part 61b Disk-like part 62 Lock operation lever (lock operation member)
63 mounting member 63a female screw hole 64 cam pin 64a male screw 65 brake member 65a annular flange 66 cam groove 67 male screw ring (linear movement member)
67a Male thread groove 68 Adjustment ring 68a Female thread groove 68b Slit 68c Female thread hole 68d Communication hole 68e Upper part (first deformation part)
68f Lower part (second deformation part)
69 Set screw (holding member)
70 Bottom plate 71 Friction member 72 Intermediate retaining member

Claims (2)

An insertion part to be inserted into the observation object;
A bending operation member that bends the distal end of the insertion portion in accordance with a forward / reverse rotation operation;
A locking operation member that is coaxial with the bending operation member and can be independently rotated;
A linearly moving member that reciprocally moves in a direction along the axis of rotation of the lock operation member and the bending operation member without rotating in conjunction with forward and reverse rotation operations of the lock operation member;
An adjustment ring that is screwed to the linear movement member, and that comes into contact with and separates from the bending operation member as the linear movement member moves linearly, and restricts or allows the rotation of the bending operation member;
A circumferential slit formed in the adjustment ring;
A holding member that changes the width of the slit by relatively contacting and separating the first and second deformed portions formed by sandwiching the slit with the slit,
A brake force adjusting mechanism for an endoscope bending operation device, comprising: The brake force adjusting mechanism of the endoscope bending operation device according to claim 1, wherein the holding member is a set screw that penetrates the first deformation portion and is screwed into a screw hole formed in the second deformation portion. A brake force adjusting mechanism of an endoscope bending operation device.

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