JPH10281356A - Connection structure of part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a bonding agent, supplied to a fitting surface mutually of a fitted part, from protruding to an outward appearance location and the other part, so as to prevent staining and deteriorating outward appearance. SOLUTION: This structure is constituted so as to connect two or more parts connected by a bonding agent. Here, a part 1, 2 is fitted to each other, also in a wall part positioned in a fitting part, a supplying hole 8 communicating with a fitting surface thereof to make the bonding agent flow in is provided, in the fitting surface fitting the parts to each other through this hole 8, the bonding agent is supplied, the parts are bonded to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining structure for connecting two or more parts of an endoscope or a treatment tool of a medical instrument with an adhesive.

[0002]

2. Description of the Related Art Conventionally, there are the following two general methods for bonding resin parts such as pipe materials to each other.
Those methods have been adopted. In the first method, the connection ends of the two parts are fitted in an intaglio manner, and an adhesive is poured into the fitting part from the gap formed at the outer periphery of the fitting part of the two parts to bond the two parts together. Is what you do. In the second method, an adhesive is applied in advance to a surface of one component to be bonded, and the adhesive is applied to another component for bonding.

[0003]

[Problems to be solved by the invention]

(Problems of the prior art) In the first method, when the adhesive is poured from the gap at the joint when the connection ends of the two parts are fitted in an intaglio manner, the adhesive is The adhesive easily protrudes from the outside, and the adhesive protrudes to a site that can be seen from the outside, resulting in impaired appearance. Further, since the adhesive is poured from the gap between the joints, the gap between the joints cannot be adhered to each other, and rather, the gap has to be opened with a certain width. Therefore, the gap between the joints becomes large, which also impairs the appearance.

On the other hand, in the second method, when fitting and bonding pipe parts and the like, the adhesive is pushed out from the fitting portion, and the adhesive which has protruded outside impairs the appearance. In either case, the appearance was poor.

Further, in any of the conventional methods, since the applied adhesive easily overflows to a portion other than a required portion, there is a problem that the periphery of the bonded portion is stained with the adhesive.

In a so-called solvent bonding system in which an object to be bonded is chemically dissolved with a solvent and the two are bonded, when a solvent adheres to a surface other than the target bonding surface, the surface is dissolved. There was a problem that the appearance was impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to prevent an adhesive supplied to a mating surface between mated parts from protruding to an external part or another part. It is another object of the present invention to provide a joining structure for components that is prevented from being stained or having a degraded appearance.

[0008]

Means and Action for Solving the Problems

(Means) In the present invention, in a joint structure of two or more components in which components are fitted to each other and the fitting portion is connected by an adhesive, the fitting is performed on a wall portion located at the fitting portion. A supply port portion, through which the adhesive flows, which is connected to the fitting surface of the portion, is provided. (Function) An adhesive is supplied to a fitting surface where the components are fitted to each other through a supply port portion formed of a small hole, a notch, or the like provided in the components, and the components are bonded to each other.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of an assembled state of a plurality of parts bonded in the present embodiment, and FIG. 2 is a longitudinal sectional view of the assembled state of the parts.

(Structure) In this embodiment, a pipe-shaped 2
This is an example of connecting two resin parts by bonding. The first part 1 is a pipe-shaped part formed of resin,
The second part 2 is a pipe-shaped part also formed of a resin material. The first component 1 and the second component 2 are connected by fitting their abutting ends together and bonding their fitting surfaces with an adhesive.

The connecting end 4 of the first component 1 has a straight pipe shape having the same inner and outer diameters as the other portions. On the other hand, the outer periphery of the connection end 5 of the second component 2 is formed as a step having a small diameter. And the first part 1
Is formed so that the inner peripheral surface of the connection end portion 4 and the outer peripheral surface of the connection end portion 5 of the second component 2 are fitted to each other, and an adhesive is poured into a gap between the two fitted surfaces. It is designed to adhere. A small gap 6 is formed between the end of the connection end 4 of the first component 1 and the rising wall surface of the step at the connection end 5 of the second component 2.

The connection end 4 of the first component 1 and the second component 2
One or more relatively small holes 8 are formed in the wall at the connection end 4 of the first component 1 which is fitted to the connection end 5 of the first component 1 and which is located outside the fitting part. ing. The hole 8 constitutes a supply port from which the adhesive is poured. Then, a water-like adhesive is poured from the hole 8 into a gap between the fitting surfaces of the connection ends 4 and 5 fitted to each other, and both the connection ends 4 and 5 fitted to each other are bonded and connected. It has become.

The material forming the first part 1 and the second part 2 is, for example, polysulfone, phenolsulfone,
Thermoplastic resins such as polyetherimide, polyphenylsulfone, polyamideimide, polyethersulfone, polyphthalsulfone, polyetheretherketone, and polyimide. As the adhesive, for example, tetrahydrafuran or methyl ethyl ketone is used.

On the other hand, as shown in FIG. 2, an adhesive injection needle 9 is prepared. The needle 9 is for pouring a water-like adhesive into the adhesive supply hole 8 when the first component 1 and the second component 2 are bonded. The tip of the needle 9 is smaller than the diameter of the hole 8 and can be inserted into the hole 8. It goes without saying that the connection end 4 of the first component 1 may be different in inner and outer diameters from other portions.

(Operation) A method of connecting the first component 1 and the second component 2 will be described. First, the connection end 5 of the second component 2 is pushed into the connection end 4 of the first component 1 and inserted, and is fitted in an intaglio manner as shown in FIG. At this time, the gap between the fitting parts of the first component 1 and the second component 2 is small.

On the other hand, the tip of the needle 9 is attached to a liquid in a container (not shown) containing a water-based adhesive, which is provided at a position slightly away from the fitting portion. Apply an appropriate amount of adhesive. Then, the tip of the needle 9 is moved to the position of the adhesive injection hole 8 of the first component 1, and the tip of the needle 9 is inserted into the hole 8 to flow the adhesive. Since there is a slight gap between the fitting surfaces at the joint between the component 1 and the second component 2, the adhesive penetrates the entire fitting surface by capillary action, and the entire joint is bonded.

Further, even if the supplied adhesive is somewhat large, the first component 1 and the second component 2 have a gap 6 in a portion facing the outside.
Therefore, the surplus adhesive accumulates in the gap 6 and does not protrude to the external appearance. The adhesive may be an adhesive that chemically dissolves an object to be bonded with a solvent and bonds them together. In this case, the first part 1
And a resin that is melted with an adhesive for the material of the second part 2.

(Effect) According to the present embodiment, it is possible to prevent the adhesive supplied to the fitting portion between the first component 1 and the second component 2 from protruding into the appearance portion. In the present embodiment, the component shape is described as a pipe, but may be a plate, a rod, or the like. The hole 8 for injecting the adhesive has a round shape in the drawing, but may have another shape such as a square or a triangle as long as it penetrates. In this embodiment, a pipe-shaped needle is used as the needle 9, but a rod, a pen point, or the like may be used as long as an adhesive can be supplied and supplied into the hole 8. further,
A pump and an adhesive tank may be connected to the needle 9, and the adhesive may be supplied to the adhesive injection hole 8 by driving the pump and dispensing an appropriate amount of the adhesive in the adhesive tank.

Examples of application of the first embodiment include an example of a two-part body of a hand-operating portion main body and a sheath of a treatment tool for an endoscope, and an example of a two-part sheath or tube in an endoscope, a treatment tool, a catheter, and the like. There is.

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIGS. (Configuration) In this embodiment, the first
Instead of the hole 8 provided at the connection end 4 in the component 1 of
One or more relatively small cutouts 11 are provided at the edge of the connection end 4 and serve as an adhesive supply port. The rest is the same as the above-described first embodiment, and a description thereof will be omitted.

(Operation) When the first component 1 and the second component 2 are joined together, the first component 1 and the second component 2 are fitted together as shown in FIG. Supply adhesive from. Except for this point, the configuration is the same as that of the first embodiment described above.

(Effects) According to the present embodiment, in addition to the effects of the first embodiment, the first component 1 has the cutout portion 11 at the adhesive supply port, so that the first component 1 has the shape of the first embodiment. compared,
It can be manufactured at low cost.

[Third Embodiment] A third embodiment of the present invention will be described with reference to FIG. (Construction) In this embodiment, at least one groove 2 extending over the entire circumference of the outer peripheral surface of the connection end 5 of the second component 2 is provided.
2, 23 are provided. Except that the grooves 22 and 23 are provided, the configuration is the same as that of the above-described first embodiment, and a description thereof will be omitted.

The cross-sectional shapes of the grooves 22 and 23 may be other than triangular as shown in FIG. 5, and may be, for example, semicircular or rectangular. Although the number of grooves 22 and 23 is shown as two in this embodiment, it may be one or three or more as necessary. Instead of the endless groove that goes around, it may be a line-shaped or dotted hole.

(Operation) This is the same as the first embodiment. (Effect) According to the present embodiment, the amount of the adhesive supplied to the adhesive supply hole 8 by the needle 9 is too large,
Even in the case where the adhesive cannot be absorbed only by the gap between the mating surfaces 5, the excess adhesive can be stored in the grooves 22 and 23 to prevent the adhesive from protruding to the external appearance.

[Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIG. (Configuration) In this embodiment, the first component 31 is a member provided with a through hole 32 at the center thereof. This first part 3
A recessed hole 34 having a diameter C and a depth D is formed coaxially at one connection end 33. One or more relatively small adhesive supply holes 35 are provided in the wall of the recess 34 in the first component 31.

The second component 36 also has a through hole 37 formed in the center thereof, and this through hole 37 communicates coaxially with the through hole 32 of the first component 31. At the tip of the second component 36, a connection end 38 that fits into the inner surface of the recess 34 of the first component 31 is formed. The outer periphery of the connection end portion 38 is formed as a small-diameter step portion that fits into the inner surface of the recessed hole 34 of the first component 31 located outside. Then, the second component 36 is inserted into the recess 34 of the first component 31.
When the connection end 38 of the first component 31 is fitted, the leading end of the connection end 33 of the first component 31 abuts on the rising end surface (contact surface) 39 of the step of the connection end 38 of the second component 36. Has become.

Further, a circumferential groove 41 is formed at the rear end portion adjacent to the rising end surface 39 on the outer periphery of the connection end portion 38 of the second component 36. Also, the second part 3
A step 42 having a small diameter is formed at the leading edge of the connection end 38 of FIG. The distal end surface 43 of the connection end 38 located inside the step 42 is the first component 31.
A slight gap is formed between the inner end surface of the recessed hole 34 and the inner end surface.

When the end surface 43 of the connection end 38 of the second component 36 is brought into close contact with the inner end surface of the recess 34 of the first component 31, the tip of the connection end 33 of the first component 31 may be used. However, the second component 36 is set so as to form a slight gap between the second component 36 and the rising end face 39 at the step of the connection end 38.

The cross-sectional shapes of the groove 41 and the step 42 are both rectangular as shown in FIG. 6, but other shapes such as a triangle or a semicircle may be used. In the present embodiment, only one groove 41 is provided, but one or more grooves may be added to the middle part of the connection end 38. Further, a groove may be formed only in the intermediate portion of the connection end 38. Other configurations in this embodiment are the same as those in the above-described first embodiment, and a description thereof will be omitted.

(Operation) In this embodiment, when the first component 31 and the second component 36 are fitted and bonded, first, the second component 36 is inserted into the recessed hole 34 of the first component 31. The connection end 38 is fitted. At this time, the tip of the first component 31 at the connection end 33 abuts on the rising end surface 39 of the step of the connection end 38 of the second component 36, and the tip of the second component 36 at the connection end 38. Face 43
Forms a slight gap between the first component 31 and the inner end surface of the concave hole 34.

As in the case of the first embodiment, when the tip of the needle 9 is inserted into the hole 35 and the adhesive is supplied, the fitting between the joint end of the first component 31 and the second component 36 is performed. The adhesive penetrates between the surfaces by capillary action, and extends over the entire fitting surface and is bonded at the entire joint end. Further, even if the supplied adhesive is somewhat large, there is a gap between the groove 41 and the step portion 42 between the first component 31 and the second component 36, so that the excess adhesive is accumulated in the gap, It does not go into the through-holes 32 and 37 inside or outside.

Even when the space cannot be absorbed only by these gaps, the gap between the leading end of the connection end 33 of the first component 31 and the rising end surface 39 of the step of the connection end 38 of the second component 36 is maintained. In the case of close contact, the protrusion to the outside can be completely prevented. On the other hand, when the tip 43 of the connection end 38 of the second component 36 and the inner end surface of the recess 34 of the first component 31 are in close contact with each other, the adhesive wraps into the through holes 32 and 37. Can be completely prevented.

(Effect) According to the present embodiment, the needle 9
Even if the adhesive supplied to the hole 35 is too much and cannot be absorbed only by the gap of the fitting portion, the excess adhesive is supplied to the groove 41.
It is possible to prevent the adhesive from protruding to the external part by accumulating in the step part 42. Further, in this embodiment, even if the adhesive is accumulated in the step 42,
Since the gap between the tip surface 4 and the front end surface 43 is small, the adhesive can be prevented from sneaking into the through holes 32 and 37.
The surface of 2,37 is not stained with an adhesive. Further, if the abutting portions adjacent to the fitting portions of the connection end portions 33 and 38 are brought into close contact with each other, it is possible to completely prevent the adhesive from protruding toward the abutting portions.

As an application example of the fourth embodiment, there is an example of two parts constituting the main body of the operation unit of the treatment tool for an endoscope. <Supplementary notes> According to the above description, the following items can be obtained. 1. In the joint structure of two or more parts in which the parts are fitted together and the fitting part is connected by an adhesive,
A joint structure for parts, wherein a supply port portion for flowing an adhesive, which is connected to a fitting surface of the fitting portion, is provided, for example, on a wall portion of the fitting portion located on the outside. 2. 2. The component joining structure according to claim 1, wherein there is a slight gap at the end of the fitting surface between the components. 3. 2. The structure for joining components according to claim 1, wherein the supply port portion into which the adhesive is poured is one or more holes or notches formed in at least one of the components. 4. In the above item (1), at least one of the fitting surfaces near the supply port portion into which the adhesive flows between the fitting surfaces of the components is provided with a storage portion such as a groove or a step portion for storing the excess adhesive in the fitting surface. A joining structure of parts, characterized by using parts.

5. In addition item 1, in the case where there are a plurality of end face mutual portions facing each other near the fitting surface portion of the components, at least one end face mutual portion is provided with a slight gap. 6. The joining structure according to claim 1, wherein at least one of the parts has at least a fitting portion made of a resin, and an adhesive used has an action of dissolving the resin. 7. Item 6. The structure for joining parts according to Item 6, wherein the adhesive used has a water-like viscosity. 8. In a method for joining two or more components by means of an adhesive, the adhesive is supplied by a supply member for pouring the adhesive into a supply port portion communicating with a fitting surface between the components. How to join parts.

[0037]

As described above, according to the present invention, it is possible to prevent the adhesive from protruding to a part other than the external part and the necessary part.

[Brief description of the drawings]

FIG. 1 is a plan view of a component according to a first embodiment in an assembled state.

FIG. 2 is a longitudinal sectional view of the component according to the first embodiment in an assembled state.

FIG. 3 is a plan view of a component assembling state according to a second embodiment.

FIG. 4 is a longitudinal sectional view of a component assembling state according to a second embodiment.

FIG. 5 is a longitudinal sectional view of a component assembling state according to a third embodiment.

FIG. 6 is a longitudinal sectional view of a component assembling state according to a fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st part, 2 ... 2nd part, 4 ... Connection end of 1st part, 5 ... Connection end of 2nd part, 8 ... Hole for adhesive supply, 9 ... Injection of adhesive needle.

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[Procedure amendment]

[Submission date] September 2, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

On the other hand, the tip of the needle 9 is immersed in a liquid in a container (not shown) containing a water-based adhesive, which is provided at a position slightly away from the fitting portion. Apply an appropriate amount of adhesive. Then, the tip of the needle 9 is moved to the position of the adhesive injection hole 8 of the first component 1, and the tip of the needle 9 is inserted into the hole 8 to flow the adhesive. Since there is a slight gap between the fitting surfaces at the joint between the component 1 and the second component 2, the adhesive penetrates the entire fitting surface by capillary action, and the entire joint is bonded.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction contents]

Furthermore, in the outer circumference of the connection end portion 38 of the second part 36, a groove 41 going around it is formed in the part content you adjacent to the rising edge 39. In addition, a step portion 42 having a small diameter is provided at the distal end edge of the connection end portion 38 of the second component 36.
Are formed. The distal end surface 43 of the connection end portion 38 located inside the step portion 42 forms a slight gap with the inner end surface of the concave hole 34 of the first component 31.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

Claims (1)

[Claims] In a joint structure of two or more parts in which parts are fitted to each other and the fitting part is connected by an adhesive, a wall of the fitting part is provided with a wall of the fitting part. A joining structure for parts, wherein a supply port portion for flowing an adhesive is provided, which is connected to the fitting surface.