JPS58124430A - Curved brake apparatus of endoscope - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending braking device for a round endoscope that fixes the bending state of a bending operation member that bends an insertion portion of an endoscope.

Conventionally known bending braking devices for endoscopes have a structure in which a friction plate is joined to and pressed against a friction plate in order to brake a bending operation member.The friction plate is fixed to the friction plate. Cheap.

In order to prevent this sticking, a mechanism for forcibly separating the friction plate from the friction plate is required, which increases the complexity of the structure. Furthermore, it is not possible to increase the diameter of the friction member, and a large amount of force is required to obtain the necessary braking force.

The present invention has been made in view of the above circumstances, and its purpose is to simplify the structure without requiring a particularly complicated mechanism for forcibly separating the friction plate from the frictional surface. An object of the present invention is to provide a bending braking device for an endoscope.

Hereinafter, each embodiment of the present invention will be described based on the drawings.

Figures 1 to 5 show a first embodiment of the present invention. *Figure H shows the entire endoscope 1, which includes an insertion section 2, an operation section , 9 and a light guide cable 4. The insertion section 2 has a distal end 1 connected to the distal end of the flexible tube 5 via a bending tube 6, and the bending tube e is connected remotely by a bending operation device layer provided in the operation section 3, as will be described later. It is designed so that it can be curved. 9. The operating section 3 is provided with an eyepiece, and the tip of the light guide cable 4 is provided with a connector 10 that can be connected to a light source device (not shown).On the other hand, the bending operating device 8 is shown in FIG. It is constructed as shown in , and a curved braking device 11 is incorporated therein. That is, an opening 1j is formed in the side wall of the main body 12 of the operating section 3, and a cover 14 is attached to the opening 13 to close the opening IJ. The bending operation device 8 and the bending braking device 11 are then attached. At the center of this cover 14 is a shaft 15.
A bearing 1 that rotatably supports the shaft body 15 by inserting the
A hole 11 into which 6 is fitted is formed. The bearing 16 is fixedly attached to the cover 14. Curve the shaft body 15 using a locking screw IJ at the outwardly protruding end.
9 is fixedly attached, and the bending operation lever 1# rotates the shaft body 15 to perform the bending operation as described later. A pulley 21 as a bending operation member for bending the bending tube 6 of the insertion section 2 is fixed to the inwardly protruding tip of the shaft body 15 via a set screw 22. An outer circumferential groove 23 of the pulley 21 is the operating wire 24
One end of each operating wire 24.24 is wound around the shaft, and the other end of each operating wire 24.24 is guided into the curved tube 6 through the insertion portion 2, and each operating wire 24.24 is pushed and pulled alternately. By doing so, the bending tube 6 can be bent. It constitutes a bending operation device 8 that bends the bending tube 6 by operating a tab and a bending operation lever 19.

Further, a brake operating body 25 as shown in FIG.
6. The second cam 27, the disk 28, and the friction member l# are aligned and fitted in order from the cover 14 side to the goofleaf 1 side. The brake operating body 2j connects the rotation 9 of the bearing 16 to the outside of the operating unit 3 through a slot 33 formed in the operating knob 32 and the rotatable ring portion 31 and the operating knob 32. It sticks out. However, the brake operating body 25 can be rotated from the outside using the operating knob 32. Further, as shown in FIG. 3, the ring portion 31 of the brake operating body 25 is attached to the tip of each of the three adjustment screws 34 provided through the cover 14. .2r side.

The first cam 26 is a disk 3 with a circular hole 15 formed in the center.
6, by passing the bearing 16 through the hole 35, it can be rotated by the rotation of the bearing 16, and the disk 3 can be rotated by the rotation of the bearing 16.
6 is fixedly attached to the ring portion 31 of the brake operating body 25.

In other words, the first cam 26 rotates together with the brake operating body 25. Further, three inclined surface portions 31 arranged at equal intervals along the circumferential direction are provided on the peripheral side of the first cam 26 facing the second cam 21 @, protruding at equal heights. It's getting worse. The direction and magnitude of the gradient of each of the inclined surface portions 37 are all formed to be equal. Incidentally, each of the above-mentioned inclined surface portions 37 is formed by pushing the disc 36 from one side using a press or the like and deforming it by protruding it.

The second cam 21 is composed of a disk 40 with a central portion protruding toward the first cam 26, for example, slightly larger than the inclined surface portion 31, thereby forming an escape recess 38 on the disk 28 side. , and there is a square hole 3 in the middle of the central part.
9 is provided. This square hole 39 is fitted into a square curved portion 41 formed on the outer periphery of the bearing 16. Therefore,
The second cam 21 cannot rotate around its bearing 16,
It is designed to be able to move only in the axial direction of the bearing 16.

Further, on the peripheral side surface of the second cam ZVK facing the first cam 26 side, three inclined surface portions 41 are arranged at equal intervals along the horse direction and protrude at equal heights. ing. The direction and magnitude of the slope of each inclined surface portion 410 are equal, and the inclined surface portion 31 of the tenth cam 26 is also formed to have the same size. However, the direction of the gradient is reversed. In a normal state in which braking is not applied, the inclined surface portions sr and 4x of the first cam 2C and the twentieth cam 27 are arranged so that they do not shift and engage with each other. When the first cam 2# is rotated together with the brake operating body 25, the inclined surface portion J1 of the first cam 2# slides against the inclined surface portion 4JFc of the second cam 21 to move the second cam 21 in the axial direction. is now possible.

Similar to the second cam 2r, the disk 2a has a central portion that protrudes toward the second cam sr@ and escapes toward the friction member 29 to form a recess 43. A square hole 44 is provided in the square hole 44, into which the square circumferential portion 41 of the bearing 1# is fitted. t, this disk 28
is fixed to the second cam 27. The disk 28 cannot rotate the bearing 16, but only the bearing 1.
It is configured so that it can move only in the axial direction of 6.

Further, the friction member 29 is formed into a hollow disc shape from a deformable friction material such as rubber such as NBR, neoprene, dityl rubber, fluorocarbon rubber, etc., and resin such as phenol resin, polypropylene resin, polyethylene acetal resin, etc. Since the escape recess 43 is provided in the disc 28, the peripheral side surface of the disc 28 is closely opposed to the curved free portion 2ga formed from the peripheral part of the friction member 2#. Also, the friction member 29! -9j1, a ring-shaped spacer 45 made of a resin such as polyacetal resin or Tear-on, which has a high elasticity, is inserted in the inner circumferential portion between the spacer 45 and -9j1. Therefore, the friction member 29 is not normally connected to the pulley 2, but the free curved portion 2, which is a local part of the friction member 29, is not connected to the pulley 2.
9a closely opposes the frictional surface 4G formed from the peripheral side surface of the pulley 21. In other words, the freely curved circumferential portion of the friction member 29 and the friction target W4g of the pulley IJO face each other with a slight gap therebetween.

The pulley 21 is covered with a daily cover 41 to prevent the operating wire 24 from coming off.

Next, the operation in the embodiment having the above configuration will be explained.

The normal O state in which no braking is applied to the Goo 921 is as shown in Fig. 2. Accordingly, the friction member 29 is connected to the pulley 1.
Although the spacer 4j is in contact with the pulley 21 at a distance from the pulley 21, the contact area is small and it is close to the center of the shaft, so no frictional force is generated. Therefore, the boo 921 can be easily and lightly rotated by the bending operation lever 1g to perform the bending operation.

Further, when braking is applied in a certain curved state, the operation knob 32 of the brake operation body 2J is operated with a finger, and the first cam 2C is rotated together with the ring portion 31. Then, the sloped surface part 31 of the tenth cam 2C and the sloped surface part 42 of the second cam 21, which had been separated from each other until then, face each other and slide into each other, and finally their maximum protruding parts are brought together as shown in FIG. Therefore, the second cam 21 moves toward the friction member 29 without rotating along its axial direction, and the disc 2
8, the curved free portion 29a consisting of the side shoulder portion of the friction member 29 is pushed and deformed by the protruding peripheral portion thereof, and is pressed against the frictional surface 46 of the Guri xio. Therefore, as shown in FIG. 4, the pulley 21 and the disc 28 sandwich the friction member 2 and are integrally formed by the frictional force generated at that time, so that the pulley 2 is braked. In other words, it can be held in that curved state. Further, if the rotation of the brake operating body 250 is stopped midway, the amount of movement of the second cam 21 will be correspondingly reduced, so that the amount of braking applied to the pulley 21 can be reduced.

Note that during the above-mentioned braking, the inner peripheral portion of the friction member J corresponding to the spacer 45 escapes into the relief recess 43 of the disc 28, so that it will not be damaged if it is pressed with excessive force.

In addition, there is a cover for the pigeon house that adjusts the maximum braking force! The tenth cam 2 can be adjusted by changing the position of the braking operation body 25 supporting the cylinder part 31 by moving the adjustment screws S4 located at
What is necessary is to change the protruding position of the inclined surface portion SVO of C.

6 to 10 show a second embodiment of the present invention, which differs from the first embodiment in the means for rotating the first cam 2#. That is, in this embodiment, the 10th cam 26 is operated as a brake operating body for rotating the cam 26, and the Δ-51 is set at the 9th position away from the IIO axis through the 9th bearing 1ilK shaft body 51. An arm 54 is provided at the inner end of the shaft body 11 without being pivotally supported.
At the tip of this arm 54, a cam pin 5# is provided which is formed in the first cam 26 and engages with a round cam receiver groove 55. In addition, when operating 14 J J, set screw 51
The scattering is fixed to the shaft body 51.

As shown in FIG. 9, when the first cam 26 is rotated to the left by the cam pin 56 of the arm 54 engaging the groove 55 by moving the operating lever 51 to the right, each The inclined surface portions 31 and 42 are separated, resulting in a non-braking state. Further, as shown in FIG. 1θ, when the operating lever 51 is tilted to the left, the first cam 26 rotates to the right, so that the respective inclined surface portions 37 and 42 slide against each other, and the second cam 26 is rotated in the same manner as described above. 21 can be moved to the friction member 29@ to apply braking.

11 to 15 show a third embodiment of the present invention. This embodiment is provided with an operating lever 51 like the second embodiment, but an arm 61 is attached to the shaft body 63 of this operating lever 51, and this arm 61 and the first cam 2
6 are connected by a link 62. That is, the intermediate portion of the arm 61 is attached and fixed to the shaft 53, and links 62 are interposed between both ends of the arm 61 and the first cam 211, thereby forming a parallel link mechanism as a whole. , the first cam 2C is rotated by rotating the arm-1 using the operating lever 51. Figure 14 shows a non-braking state in which the operating lever 51 is tilted to the left and the *10 cam 26 is rotated to the left, and Figure 15 is a non-braking state in which the operating lever 51 is tilted to the right and the first cam 26 is rotated to the right. It shows the braking state by rotating. The operation at this time is similar to that of the previous embodiment.

Further, in this embodiment, as shown in FIG. 13, a support plate 63 is provided to support the first cam 21 and the link C2. Furthermore, a notch 64 is provided in the gooley cover 41 as a means for preventing the second cam 270 from rotating.
The second cam 21 is fitted with nine protrusions 65.

Incidentally, since the disc 28 is fixed to the second cam 21, there is no need to provide its own means for preventing its rotation.

In addition, in the above embodiment, the first and second cams 21s
, 2fl's sloped surface portions 31.42 are not limited to three locations, but may be provided at any two or more locations.Furthermore, although each sloped surface portion 31.42 was made to slide against each other, one of the sloped surface portions 31.42 is It may be a simple protrusion instead of an inclined surface. However, in the present invention, one of the inclined surfaces that should be slid together in the above-described embodiment is treated as a protrusion.

Further, in the present invention, it is sufficient that either one of the inclined surface portion and the protruding portion that slide together protrudes from the disc of the cam.

Furthermore, the friction member and the disc portion of the cam that does not rotate may be formed as one piece.

In addition, in the above embodiment, the operation wire is attached to the shaft of the bending operation lever and is operated using nine pulleys.
The glue may be attached to a shaft separate from the shaft body.

Nine! - It is also possible to use a rack and pinion to advance and retreat the operating wire without moving the operating wire forward and backward.

As explained above, in the curved braking device for an endoscope according to the present invention, the friction member is made of an elastic material and presses against the braked member to apply the brake, and there is a partial gap between the braked member and the friction member. - By inserting a brake member, a certain gap is usually created between the braked member and the friction member, and when applying braking, the elastic friction member is pressed against the braked member. Therefore, when the brake is released, the friction member restores itself by its own force and separates from the braked member.For this reason, a special mechanism for forcibly separating the friction member is required. If necessary, the structure can be simplified and miniaturized.It is also advantageous to increase the braking force by increasing the size of the friction member.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an endoscope according to a first embodiment of the present invention;
FIG. 2 is a side sectional view of the curved braking device, FIG. 3 is an exploded perspective view of parts of the curved braking device of the river bank, and FIG. FIG. 7 is a side sectional view of the brake operating portion in the second embodiment, FIG. 8 is a front view of the brake operating portion, and FIG. 9 is a non-braking side view. FIG. 10 is a front view showing the O state during braking, FIG. 11 is a side sectional view of the curved braking device portion in the third embodiment of the present invention, and FIG. outside curved braking device
Fig. 13 is a side sectional view of the braking operation part, Fig. 14 is a front view showing the non-braking state, and Fig. 15 is a front view showing the braking state. be. 1... Endoscope, 2... Insertion section, 3... Operation section, 8
... Curving operation device, 11... Curving braking device, 19.
...Bending operation lever, 2)...Pulley, 25...Brake operation body, 26...First cam, 21...Second cam, 29...Friction member, 29a... free curved part,
31...Ring part, 32...Operation knob, 37...
Inclined surface portion, 42... Inclined surface portion, 45... Spacer,
46...Friction surface, 51...Operation lever, 61...
・Arm, 62...link. Figure 1 Figure 2 Crocodile Figure 3

Claims (1)

[Claims] An endoscope that applies a brake to the operation of the bending operation device to bend the insertion section via the operation wire by rotating the bending operation member.The bending braking device rotates in conjunction with the bending operation member. a braked member having a frictional surface; a friction member formed of an elastic body having a free curved portion facing the frictional surface of the braked member; and a curve of the frictional member.
A sweeper inserted between the braked member and the friction member excluding at least the free portion, and pressing the curved free portion of the friction member against the frictioned surface of the braked member in response to operation by the bending operation member. 1. A curved braking device for an endoscope, comprising means for applying braking.