JPH08103450A - Forceps device for endoscope and its manufacture - Google Patents

Abstract

PURPOSE: To form a gap to secure turnability between a forceps cup and a link without requiring complicated and expensive facility. CONSTITUTION: This device is constituted in such a way that a projecting part 7 is provided on a part of each face in the neighborhood of a pivotal attaching hole in which a connection piece 4 extended to the connection part 3 of the forceps cup and the link are superimposed, and the projecting part 7 is formed so as to be superimposed at only a position other than the opening/closing angle range 14 of the forceps cup 2. When the connection piece 4 and the link 10 are assembled, they are connected with a pivotal attaching pin in a state where the projecting part 7 is superimposed at the position other than the opening/closing angle range 14, and the gap required for turning can be secured between the mating face of the connection piece 4 and the link 10 by moving the link 10 to a location within the opening/closing angle range 14 after connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forceps device for an endoscope.

[0002]

2. Description of the Related Art FIG. 18 shows a conventional forceps device for an endoscope.
The forceps device 58 for an endoscope shown in is generally known. In the forceps device 58 for an endoscope, the tip portion 63 of the forceps device 58 is used for the endoscope 5.
0 through the forceps port 52 provided in the operation unit 51, and the distal end portion 55 of the endoscope 50 via the insertion channel (not shown) built in the connecting portion 53 and the bending portion 54 of the endoscope. The pair of forceps cups 57 at the tip portion 63 is projected from the forceps outlet 56 provided in, and the forceps cups 57 are used by being opened and closed.

As shown in FIGS. 18 and 19, the forceps device 58 for an endoscope is provided with an operating portion 61 at a base end portion 60 of a flexible tube 59 which can be inserted into an insertion channel of an endoscope 50. Is connected to the flexible support member 62, and the distal end portion 63 is connected to the slit opening cover 64, and the pair of forceps cups 57 are attached to the slit opening cover 64.
It is configured by pivotally connecting through 5 so as to be openable and closable.

Further, the pair of forceps cups 57 has an operating wire in which a connecting piece 67 extending to each connecting portion 66 is inserted into a flexible tube 59 through a pair of links 68 and a wire joint fitting 69. It is connected to 70. In the figure, 71 is a first pivot pin, and 72 is a second pivot pin. The rear end of the operation wire 70 is connected to the operation knob 73 that constitutes the operation portion 61.

With this configuration, the forceps device 58 for an endoscope holds the operating knob 73 between the second and third fingers and provides the flexible tube support member 62 with the first finger (thumb). Hole 74
The operating knob 73 and the flexible tube support member 62.
The forceps cup 57 is opened and closed by relative movement with respect to.

The structure of the forceps cup 57 of the forceps device 58 for an endoscope having this structure and the connecting portion of the link 68, and the connecting method will be described in detail with reference to FIG. Forceps cup 5
The connecting piece 67 and the link 68 extending to the connecting portion 66 of FIG. 7 are provided with pivot holes 75 and 76, respectively, and are rotated via pivot pins 71 fitted in the pivot holes 75 and 76. It is movably connected.

In this case, as shown in FIG. 20, the shaft diameter of the pivot pin 71 is such that the pivot pins 75 and 76 can be precisely fitted and slid, and a locking edge 77 is provided at one end thereof. I have. When connecting the forceps cup 57 and the link 68 with the pivot pin 71, first, the forceps cup 57 and the pivot holes 75 and 76 of the link 68 are coaxially overlapped, and the pivot pin 71 is attached to the shaft portion 78. Inserted from, the locking edge 77 is the link 6
Push until it hits 8. After that, the other end of the pivot pin 71 is welded to the connecting piece 67 side by laser welding 79
And then fixed. In addition, this connection method is
This is a known technique disclosed in Japanese Patent Publication No. 498.

However, the forceps cup 57 and the link 68 connected by the above method have no gaps in their mating surfaces,
There is a problem that they are tightly adhered to each other and are poor in turning performance, and in order to solve this problem, a lapping agent is applied to the mating surface and the mating surface is forcibly rotated so that the mating surface is not rotated. It is also practiced to wear them to create a gap.

As another method for solving this problem,
The invention disclosed in Japanese Patent Publication No. 3-66530 is known. In this method, the forceps cup 57 and the pivot holes 75 and 76 of the link 68 are coaxially overlapped, the pivot pin 71 is inserted from the shaft portion 78, and the locking edge 77 of the pivot pin 71 abuts on the link 68. After pushing in, the pivot pin 71 is lowered by a predetermined amount to provide a gap between the forceps cup 57 and the link 68, and then the shaft portion 78 of the pivot pin 71 and the connecting piece 67.
And are welded 79 by laser welding and fixed. In this method, since a predetermined amount of gap is formed between the forceps cup 57 and the link 68, the rotatability is good.

[0010]

However, there is a problem that it is difficult to obtain smooth slidability by the method of applying the wrapping agent between the forceps cup 57 and the link 68 and forcibly rotating the wrapping agent. . In addition, the forceps cup 57 and the link 68 are overlapped with each other, and the pivot pin 71 is pushed in until its locking edge 77 hits, and then lowered by a predetermined amount.
In the method of providing the gap between the link 68 and the link 68,
There is a problem in that very complicated and expensive equipment is required because it has to be lowered by a predetermined amount after pushing in.

Therefore, the present invention has been made in view of the above-mentioned problems, and it is possible to form a gap for ensuring the rotatability between the forceps cup and the link without requiring complicated and expensive equipment. An object of the present invention is to provide a forceps device for an endoscope and a method for manufacturing the same.

[0012]

In order to achieve the above object, the present invention provides a pair of forceps cups each having a connecting piece extending in a connecting portion, and a first pivot pin on each of the connecting pieces. Link, the operation wire joint metal fittings connected to the two links via the second pivot pin, and the forceps cup to each connection part of the forceps cup via the third pivot pin. In a forceps device for an endoscope that opens and closes a forceps cup by a link mechanism that includes a slot opening cover that is supported on the armature, the forceps cup of the forceps device for an endoscope is a connecting piece that is extended to a connecting portion of the forceps cup. Since the first pivot pin is relatively rotated between the surfaces of the link and the link in the range of about 90 ° to open and close, the present invention ensures that a required clearance can be ensured only on the surface within this angle range. Configured to.

That is, when the linking piece and the link extending to the linking portion of the forceps cup are linked through the first pivotal pin, they are in the vicinity of the pivotal holes on the surfaces that overlap each other, and the opening / closing angle range of the forceps cup is large. Provide a convex portion that overlaps in an angle range other than
The forceps cup and the protrusion of the link were overlapped at a position outside the opening / closing angle range, and were connected by a pivot pin.

Alternatively, when the linking piece and the link extending to the linking portion of the forceps cup are linked through the first pivotal pin, they overlap each other in the vicinity of the pivot holes on the surfaces that overlap each other and within the opening / closing angle range. A convex portion on one surface and a concave portion on the other surface are provided, and the forceps cup and the link are overlapped at a position outside the opening / closing angle range where the convex portion and the concave portion do not overlap each other. Connected.

Alternatively, when the connecting piece and the link extending to the connecting portion of the forceps cup are connected via the first pivoting pin, the forceps cup is opened and closed in the vicinity of the pivoting hole on the surfaces overlapping each other. A lower surface that overlaps with each other inside is provided on the surface of the connecting piece of the forceps cup, and the forceps cup and the link are overlapped at a position where the lower surfaces do not overlap outside the opening / closing angle range for opening and closing the forceps cup. It was connected by connecting pins.

[0016]

According to the present invention, in the first to sixth aspects, the connecting piece of the forceps cup and the link are kept superposed at a position other than the opening / closing angle range of the forceps cup while the pivot hole is pivoted with respect to the pivot hole. Push the fastening pin until its locking edge hits the link, and weld and fix the end of the pivot pin to the connecting piece of the forceps cup so that when the link is returned to the opening / closing angle range of the forceps cup, it will be connected. A required gap is secured between the piece and the link.

[0017]

Embodiments of the present invention will be specifically described below with reference to the drawings. In each of the embodiments, common points will be denoted by common reference numerals and corresponding description will be omitted.

[0018]

Embodiment 1 FIGS. 1 to 7 show Embodiment 1 of the present invention,
1 is a front view of the forceps cup, FIG. 2 is a side view of FIG. 1, and FIG.
4 is a front view of the link, FIG. 4 is a side view of FIG. 3, FIG. 5 is a side view of the pivot pin, FIG. 6 is an explanatory view of a method for assembling the forceps cup and the link, and FIG. 7 is a view of the connected forceps cup and the link. FIG.

The forceps cup 1 comprises a cup 2 for collecting biological tissue, a connecting portion 3 and a connecting piece 4 extending from the connecting portion 3. The connecting portion 3 is provided with a pivot hole 5 for connecting to a slit opening cover (64 in FIG. 19) at the tip of the forceps device for an endoscope with a pivot pin (65 in FIG. 19). Link 10
A pivot hole 6 is formed for connection with a pivot pin 20. In the vicinity of the pivot hole 6 on the connecting surface of the connecting piece 4 with the link 10, there are provided two convex portions 7 formed higher than the other surfaces to form a gap between the surfaces.

As shown in FIGS. 3 and 4, the link 10 has a pivot hole 11 for connecting to the forceps cup 1 and a pivot hole 12 for connecting to a wire joint fitting (69 in FIG. 19). The pivot hole 11 connected to the forceps cup 1 is a countersink hole 11 a so that a locking edge 21 of a pivot pin 20 described later does not protrude from the surface of the link 10. Protrusions 13 for forming a gap are provided at two positions on the surface in contact with the forceps cup 1 near the pivot hole 11.

As shown in FIG. 5, the pivot pin 20 for connecting the forceps cup 1 and the link 10 has the shaft portion 22 precisely fitted into the locking holes 6 and 11 formed in the forceps cup 1 and the link 10. Has a diameter that allows it to slide, and a locking edge 21 that is larger than the diameter of the shaft portion 22 is formed at one end thereof.

When the forceps device for an endoscope is actually used, a pair of forceps cups 1 projecting from the distal end of the device are used by opening and closing, and the opening and closing angle is within a range of about 90 °. As indicated by the chain double-dashed line 1 in FIG. 1, the positional relationship of the link 10 with respect to the forceps cup 1 is that when the link 10 is at the position 10a, the forceps cup 1 is in the open state, and at the position 10b, the forceps cup 1 is in the closed state. become. Therefore, it is necessary to ensure the rotatability of the link 10 within the opening / closing angle range 14 of the forceps cup 1.

Therefore, in this embodiment, the forceps cup 1 is used.
Side and the gap forming convex portion 13 on the link 10 side and the gap forming convex portion 13 on the link 10 side so as to overlap at a position outside the opening and closing angle range of the forceps cup 1, that is, at a position 10c which is 45 ° apart from 10b in FIG. In addition, in the use angle range 14 of FIG. 1, they are formed so as not to overlap with each other, and are formed so as not to overlap at other positions.

Next, a method of assembling the forceps cup and the link will be described with reference to FIG. In the figure, 30 is an assembling jig, and the main components of the jig 30 are a jig body 31, a push-up pin 32, and a fixing member 3 for fixing the work.
3 and 3. The position of the upper end of the push-up pin 32 is
Normally, it is located at the same position as or slightly lower than the surface of the jig body 31, and can be projected from the surface of the jig body 31 as needed by a spring or the like not shown.
Further, the fixing member 33 can fix the work by sandwiching the work with the jig body 31 with a screw or the like not shown.

Using this assembly jig 30, the pivot pin 20 is first erected on the end face of the push-up pin 32 with the locking edge 21 facing downward. At this time, the upper end of the push-up pin 32 is located slightly lower than the surface of the jig body 31, and the locking edge 2 is attached to the inner diameter of the hole 32a into which the push-up pin 32 is vertically movable.
The pin 20 is positioned by fitting the outer diameter of 1.

Next, the link 10 is placed on the upper surface of the jig main body 31 with its pivot hole 11 aligned with the pivot pin 20 and the convex portion 13 facing upward. Then, the forceps cup 1 is placed on the link 10 with its pivot hole 6 aligned with the pivot pin 20 and the convex portion 7 facing downward. In this case, the forceps cup 1 and the link 10 are 10c shown in FIG.
And the convex portions 7 and 1 formed on both mating surfaces.
Hold the 3 facing each other.

In this state, the forceps cup 1 and the link 10 are fixed by sandwiching them between the jig body 31 by the fixing member 33. Thereby, the forceps cup 1 and the link 1
0 is in close contact with the surfaces of the convex portions 7 and 13.

After the forceps cup 1 and the link 10 are fixed, the push-up pin 32 is pushed upward to move the pivot pin 20.
The locking edge 21 of is applied to the link 10. By maintaining this state and irradiating the laser beam 36 through the welding window 35 located right above the pivot pin 20 of the fixing member 33, the connecting piece 4 of the forceps cup 1 and the shaft portion 22 of the pivot pin 20 are irradiated. The ends are fixed by welding 37.

The forceps cup 1 and the link 10 assembled by the above steps are removed from the jig 30, and the forceps cup 1
The actual use range 1 shown in FIG.
Move to 4. As a result, the surface contact between the convex portions 7 and 13 is eliminated, a gap 34 is secured between the surfaces in the use range 14 as shown in FIG. 7, and the forceps cup 1 is smoothly opened and closed as a forceps device for an endoscope. It becomes possible to operate.

Further, in this embodiment, the number of the convex portions 7 and 13 for forming the gap is two, but the number is not limited to two, and it may be one, three, or four. However, if the number of the forceps cups 1 is set to 3 or 4, the opening of the forceps cup 1 may be limited (narrowed) in some cases.

According to this embodiment, it is possible to form the gap 34 between the forceps cup 1 of the forceps device for an endoscope and the link 10 for ensuring the rotatability.

[0032]

Second Embodiment FIGS. 8 and 9 show a second embodiment of the present invention,
8 is a front view of the forceps cup, and FIG. 9 is a side view of FIG. The forceps cup 40 in this embodiment is used in combination with the link 10 in the first embodiment and is a modification of the first embodiment. This forceps cup 40 replaces the gap forming protrusion 7 of the forceps cup 1 of the first embodiment, and replaces only the portion that overlaps the protrusion 13 of the link 10 when connected to the link 10 and rotated within the opening / closing angle 14. A gap forming concave portion 8 which is one step lower than the other portions is formed, and a gap forming flat surface portion 9 is formed in the other portion.

When assembling the forceps cup 40 and the link 10 of this embodiment, the link 10 is set to the position 10c in FIG. 1, and the flat portion 9 for forming the gap of the forceps cup 40 and the link 1 are arranged.
Keep the state where the gap forming projection 13 of 0 is overlapped,
Since the connection is completed through the same steps as those in the first embodiment, the description thereof will be omitted. After that, the forceps cup 40 and the link 10 connected to each other have their relative positions moved to the actual use range 14, whereby a gap required for rotation is secured between the surfaces, and the same effect as that of the first embodiment is obtained. Play.

[0034]

Third Embodiment FIGS. 10 and 11 show a third embodiment of the present invention, FIG. 10 is a front view of a link, and FIG. 11 is a side view of FIG. The link 41 in this embodiment is used in combination with the forceps cup 1 in the first embodiment.
This is a modified example. The link 41 is connected to the forceps cup 1 in place of the gap forming protrusion 13 formed in the link 10 of the first embodiment, and overlaps with the protrusion 7 of the forceps cup 1 when rotating in the opening / closing angle range 14. The gap forming concave portion 18 is formed by lowering only that of the other portion, and the gap forming flat portion 15 is formed in the other portion.

When assembling the link 41 and the forceps cup 1 of this embodiment, the link 10 is set to the position 10c in FIG. 1, and the flat portion 15 for forming the gap of the link 41 and the forceps cup 1 are arranged.
Since the state where the convex portion 7 for forming a gap is overlapped is maintained and the connection is completed through the same steps as in the first embodiment, the description thereof will be omitted. Linked forceps cup 40 and link 10
After that, by moving the relative position to the actual use range 14, a gap required for rotation is secured between the surfaces, and the same effect as that of the first embodiment can be obtained.

[0036]

Fourth Embodiment FIGS. 12 to 17 show a fourth embodiment of the present invention, FIG. 12 is a front view of a forceps cup, FIG. 13 is a side view of FIG. 12, FIG. 14 is a front view of a link, and FIG. 14 is a side view, FIG. 16 is an explanatory view of a method of assembling the forceps cup and the link,
FIG. 17 is a partial cross-sectional view of the forceps cup and the link which are connected.

The forceps cup 42 in this embodiment is shown in FIG.
2 and FIG. 13, in the vicinity of the pivot hole 6 on the connecting surface of the connecting piece 4 with the link 44, a gap forming recess 43 which is one step lower than the other surface, and in the other portion, the gap forming flat surface portion 16 is formed. Is formed. As shown in FIG. 14, the link 44 has a pivot hole 11 for connecting to the forceps cup 42 and a pivot hole 12 for connecting to the wire joint fitting, and the portions other than the vicinity of the pivot hole 11 are lowered one step. Is forming. The same pivot pin 20 as in the first embodiment is used as the pivot pin connecting the forceps cup 42 and the link 44.

When the forceps device for an endoscope having the above-mentioned structure is actually used, the positional relationship of the link 44 with respect to the forceps cup 42 is as shown by the chain double-dashed line in FIG.
At the position 4a, the forceps cup 42 is opened, and at the position 44b, the forceps cup 42 is closed. Therefore, it is necessary to secure the rotatability of the link 10 within the opening / closing angle range 14 of the forceps cup 42.

For this purpose, the forceps cup 42 shown in FIG.
The gap forming recess 43 is wider than the area where the link 44 overlaps the connecting piece 4 in the opening / closing angle range 14 and is formed lower than the other surface, and the other portion forms the gap forming flat portion 16. are doing. On the other hand, the link 44 is shown in FIG.
As shown in FIGS. 4 and 15, the vicinity of the pivot hole 11 is formed with a flat surface 17 which is one step higher than the other surfaces.

Next, a method of assembling the forceps cup and the link will be described with reference to FIG. Since the assembly jig used in the manufacturing method of the present embodiment is the same as that of the first embodiment, its description is omitted.

First, the pivot pin 20 is set up on the end surface of the push-up pin 32 with the locking edge facing down. Next, link 44
Is placed on the upper surface of the jig body 31 with the pivot hole 11 aligned with the pivot pin 20 and the flat portion 17 facing upward. Subsequently, the forceps cup 42 is placed on the link 44 with its pivot hole 6 aligned with the pivot pin 20 and the gap forming flat portion 16 facing downward. In this case, the relative position between the forceps cup 42 and the link 44 is the position 44c shown in FIG.
The pivot hole 5 of the forceps cup 42 and the pivot hole 12 of the link 44 are located on the same side. At this time, the flat portions 16 and 17 of both are in a state of facing each other.

In this state, the forceps cup 42 and the link 44 are sandwiched between the jig bodies 31 and fixed by the fixing member 33. As a result, the forceps cup 42 and the flat portions 16 and 17 of the link 44 are brought into close contact with each other.

After fixing the forceps cup 42 and the link 44, the push-up pin 32 is pushed up to move the pivot pin 20.
The locking edge 21 of is applied to the link 44. By maintaining this state and irradiating the laser beam 36 from the welding window 35 located right above the pivot pin 20 of the fixing member 33, the connecting piece 4 of the forceps cup 42 and the shaft portion 22 of the pivot pin 20 are irradiated. The ends are fixed by welding 37.

The forceps cup 42 and the link 44 assembled by the above steps are removed from the jig 30, and the positional relationship between the forceps cup 42 and the link 44 is moved to the actual use range 14 shown in FIG. As a result, the surface contact between the two flat portions 16 and 17 is eliminated, and the gap 34 is secured between the two surfaces in the use range 14 as shown in FIG. 17, and the forceps cup 1 that is smooth as a forceps device for an endoscope is obtained. Opening and closing operations are possible.

According to the present embodiment, by providing the gap forming recess 43 in the connecting portion 4 of the forceps cup 42, which is one step lower, the structure is simpler than that of the first embodiment, so that the cost for processing parts can be reduced. The same effect as that of the first embodiment can be obtained.

[0046]

According to the present invention, as the effects according to claims 1 to 4, a gap for ensuring rotatability is provided between the forceps cup and the link without using complicated and expensive equipment. It will be possible. The effects according to claims 5 to 6 are, in addition to the effects according to claims 1 to 4, the shape of the component is simpler, so that the processing cost of the component can be reduced.

[Brief description of drawings]

FIG. 1 is a front view of a forceps cup according to a first embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of a link showing the first embodiment of the present invention.

FIG. 4 is a side view of FIG.

FIG. 5 is a side view of the pivot pin.

FIG. 6 is an explanatory diagram of a method of assembling the forceps cup and the link according to the first embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a forceps cup and a link connected according to the first embodiment of the present invention.

FIG. 8 is a front view of a forceps cup showing Embodiment 2 of the present invention.

9 is a side view of FIG.

FIG. 10 is a front view of a link showing a third embodiment of the present invention.

11 is a side view of FIG.

FIG. 12 is a front view of a forceps cup showing Embodiment 4 of the present invention.

FIG. 13 is a side view of FIG.

FIG. 14 is a front view of a link showing a fourth embodiment of the present invention.

FIG. 15 is a side view of FIG. 14;

FIG. 16 is an explanatory diagram of a method of assembling a forceps cup and a link according to a fourth embodiment of the present invention.

FIG. 17 is a partial cross-sectional view of a forceps cup and a link connected according to the fourth embodiment of the present invention.

FIG. 18 is a diagram showing an outline of a conventional forceps device for an endoscope.

FIG. 19 is a diagram illustrating a tip portion of a conventional endoscopic forceps device.

FIG. 20 is a diagram illustrating a structure of a forceps cup and a link portion of a conventional endoscope forceps device.

[Explanation of symbols]

 1,40,42 Forceps cup 2 Cup part 3 Connecting part 4 Connecting piece 5,6,11,12 Pivoting hole 7,13 Gap forming convex part 8,18,43 Gap forming concave part 9,15,16,17 Gap forming flat part 10, 41, 44 Link 20 Pivoting pin 21 Locking edge 22 Shaft part 30 Jig 31 Jig body 32 Push-up pin 33 Fixing member 34 Gap 35 Welding window 36 Laser light 37 Welding part 64 Slot Opening cover 69 Wire fitting

Claims (6)

[Claims] 1. A pair of forceps cups each having a connecting piece extending to a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. A forceps by a link mechanism including a joint fitting of an operation wire connected via a pin and a slot opening cover that rotatably supports the forceps cup via a third pivot pin at each connection portion of the forceps cup. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole of a surface that overlaps with each other when connecting a linking piece extending to a linking part of a forceps cup and a link via a first pivot pin, Moreover, the forceps device for an endoscope is characterized in that it is provided with a convex portion that overlaps in an angle range other than the opening / closing angle range of the forceps cup. 2. A pair of forceps cups each having a connecting piece extending in a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. A forceps by a link mechanism including a joint fitting of an operation wire connected via a pin and a slot opening cover that rotatably supports the forceps cup via a third pivot pin at each connection portion of the forceps cup. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole of a surface that overlaps with each other when connecting a linking piece extending to a linking part of a forceps cup and a link via a first pivot pin, In addition, the present invention is characterized in that a convex portion that overlaps in an angle range other than the opening / closing angle range of the forceps cup is provided, and the forceps cup and the link convex portion are overlapped at a position outside the opening / closing angle range and are connected by a pivot pin. Of forceps device for endoscope Production method. 3. A pair of forceps cups each having a connecting piece extending to a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. A forceps by a link mechanism including a joint fitting of an operation wire connected via a pin and a slot opening cover that rotatably supports the forceps cup via a third pivot pin at each connection portion of the forceps cup. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole of a surface that overlaps with each other when connecting a linking piece extending to a linking part of a forceps cup and a link via a first pivot pin, Moreover, a forceps device for an endoscope, characterized in that a convex portion on one surface and a concave portion on the other surface that overlap each other within the opening / closing angle range are provided. 4. A pair of forceps cups each having a connecting piece extending to a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. The operating wire joint metal fittings connected via pins, and the slit opening cover that rotatably supports the forceps cups via the third pivot pins at the respective connection portions of the forceps cups are provided. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole of a surface that overlaps with each other when connecting a linking piece extending to a linking part of a forceps cup and a link via a first pivot pin, Moreover, a convex portion on one surface and a concave portion on the other surface that overlap each other within the opening / closing angle range are provided, and the forceps cup and the link are superposed at a position outside the opening / closing angle range where the convex portion and the concave portion do not overlap each other. And connect with a pivot pin. Method of manufacturing an endoscopic forceps device according to claim. 5. A pair of forceps cups each having a connecting piece extending to a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. The operating wire joint metal fittings connected via pins, and the slit opening cover that rotatably supports the forceps cups via the third pivot pins at the respective connection portions of the forceps cups are provided. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole on a surface that overlaps with each other when connecting a linking piece extending to a linking part of the forceps cup and a link via a first pivot pin, A forceps device for an endoscope characterized in that a lower surface which overlaps with each other within the opening / closing angle range of the forceps cup is provided on the surface of the connecting piece of the forceps cup. 6. A pair of forceps cups each having a connecting piece extending to a connecting portion, a link connected to each of the connecting pieces via a first pivoting pin, and a second pivotally connecting to the two links. The operating wire joint metal fittings connected via pins, and the slit opening cover that rotatably supports the forceps cups via the third pivot pins at the respective connection portions of the forceps cups are provided. In the forceps device for an endoscope that opens and closes a cup, in the vicinity of a pivot hole on a surface that overlaps with each other when connecting a linking piece extending to a linking part of the forceps cup and a link via a first pivot pin, In addition, a lower surface that overlaps each other within the opening and closing angle range of the forceps cup is provided on the surface of the connecting piece of the forceps cup, and the forceps cup and the link are connected at a position where the lower step surface does not overlap outside the opening and closing angle range for opening and closing the forceps cup. Overlaid state In method of the endoscope forceps device which comprises ligating the pivot pin.