JPH0738738U - Bolt sealing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a bolt sealing device which has a small number of constituent parts, has a good mounting workability, can be used again, and can be reliably sealed by lightly tightening a bolt. In a bolt seal device in which a seal member 5 is fitted on a screw shaft portion 2 of a bolt 1, a seal member 5 in which an annular washer 21 and an elastic seal body 31 are integrated is used. The skirt portion 27 is continuously provided on the outer peripheral edge of the annular seat plate portion 22 having the inclined inner visor 26 at the peripheral portion, and the inside thereof is formed in the elastic seal body storage portion 28. On the other hand, the elastic seal body 31 is A short tubular portion 34 having a narrowed portion 32 at the center and an annular raised portion 33 protruding from the annular seat plate portion 22 is connected to the free end of the narrowed portion 32 at the center of the annular disc portion 36 housed integrally in the seal body housing portion 28. A plurality of annular lips 35 that are provided and project from the edge of the skirt 27 are formed on the seating surface of the annular board 36.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a bolt seal device that can seal between a bolt head and a fastening member when a bolt is tightened by a washer fitted to a screw shaft portion of the bolt and an elastic seal body. is there.

[0002]

[Prior art]

 This type of bolt sealing device needs to be easy to install in order to have a reliable sealing effect against water intrusion, and various improvements have been tried from these viewpoints. Recently, there is the technology shown in Jitsukaihei 5-58933. As shown in FIGS. 3 and 4, this technique comprises a dish-shaped washer W fitted on the screw shaft portion of the bolt B and a convex annular packing P made of an elastic material such as rubber. The fastening member K is fastened to the fastened member J by the movement. Specifically, the packing P has an annular projection Pa fitted between the inner peripheral surface of the washer W and the outer peripheral surface of the bolt B. On the other hand, the inner peripheral edge Wa of the washer W is bent in a dogleg shape toward the tip of the bolt B to form a gap S between the one end face Pb of the packing P and the washer W.

In such a bolt sealing device, it is necessary to first fit the washer W to the bolt B and then to fit the annular projection Pa of the convex annular packing P into the hole on the inner circumference of the washer W. After that, the bolt B is screwed into the female thread portion of the member J to be fastened with the fastening member K sandwiched therebetween, and as shown in FIG. 3, a gap S is formed between the one end face Pb of the packing P and the washer W. In this state, when the bolt B is rotated and screwed into the fastened member J, the inner peripheral edge Wa of the washer W bites in the arrow direction, that is, the inner peripheral portion of the packing P. After that, the packing P is largely deformed by the pressing action of the washer W, and finally, as shown in FIG. 4, the packing P is filled between the washer W and the fastening member K and in the annular recess Ba of the bolt B. Complete the fastening work. In this state, the packing P is not restricted by the skirt portion Wb and the collar portion Wc of the washer W and is not exposed to the outside, and the appearance is good.

However, in such a bolt seal device, although the pressing force against the one end face Pb of the packing P is relaxed by the gap S when the bolt is tightened as described above, the inner peripheral edge Wa of the washer W shown by an arrow in particular is reduced. The packing P tends to be largely displaced by the force and the tightening force also tends to be large, and if tightening and removing are repeated many times, the problem remains that the packing P is damaged and the restorability is lost.

[0005]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to improve only the problem while maintaining the advantages of the conventional bolt seal device described above, and to reduce the number of components by integrating the washer and the packing. (EN) Provided is a bolt sealing device which not only enhances the easiness, but also does not impair the sealing performance even if it is repeatedly tightened and removed, and which is capable of reliably sealing with a light bolt tightening force. .

[0006]

[Means for Solving the Problems]

 The bolt sealing device according to the present invention, which has solved the above-mentioned problems, is a bolt sealing device in which a sealing member is fitted on a screw shaft portion of the bolt, wherein the sealing member is an annular washer and an annular elastic sealing body. And the washer are integrated, and the washer has a short tubular hem part continuously connected to the outer peripheral edge of the annular seat plate part having an inclined inner side, and the inside thereof serves as an elastic seal body storage part. On the other hand, in the elastic seal body, an intermediate portion is formed in a narrowed portion corresponding to the inclined inner portion at the center of the annular plate portion housed integrally in the seal body housing portion of the washer. A series of short cylinders are formed to form an annular ridge projecting from the annular seat plate at its free end, and a plurality of annular lips projecting from the edge of the skirt on the seating surface of the annular disc. It is characterized by being

[0007]

[Action]

 In the bolt sealing device according to the present invention, a seal member, in which a washer and an elastic seal body are integrated, is attached to a screw shaft portion when a mounting seal work is performed. It only needs to be screwed through the hole of the member and screwed into the nut on the back side to rotate, so the mounting workability is very good, and the sealing part is formed on the elastic seal body and has an annular ridge protruding from the washer and an annular shape. Since the lip is effectively deformed into a flat surface, a light bolt can be tightened to ensure a tight seal, but the washer has a short tubular hem on its outer peripheral edge. Restricted to the vertical width, excessive tightening is prevented.

[0008]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a bolt integrally provided with a head portion 3 having a collar portion at one end of a screw shaft portion 2. The lower surface of the head portion 3 is formed into a horizontal flat seat 4. Reference numeral 5 denotes a seal member fitted to the screw shaft portion 2 of the bolt 1, and the seal member 5 is formed by integrating an annular washer 21 and an annular elastic seal body 31. The seal member 5 is fitted on the screw shaft portion 2 of the bolt 1 with the washer 21 facing the flat seat 4. The bolt 1 of the bolt 1 is screwed to the welding nut 53 which is welded to the back surface of the fastening member 51 through the respective holes of the fastening member 51 and the fastened member 52 which is superposed thereon.

The washer 21 has an inner surface of the annular seat plate portion 22 which can contact the flat seat 4 on the lower surface of the head 3 of the bolt 1 and the opposite side of the enlarged diameter slope 23 whose hole edge faces the flat seat 4. It is formed on the side of the reduced diameter slope 24 and a slanted inner eave 26 which is a projecting edge 25 located at the boundary between the two, and at the outer peripheral edge of the annular seat plate portion 22, a short tubular hem portion 27 is formed. Of the washer 21 and the screw shaft portion 2 when the seal member 5 is fitted on the screw shaft portion 2 of the bolt 1. The central hole diameter is formed to be considerably larger than the inner diameter of the screw shaft portion 2 so that a sufficient space is formed therebetween.

On the other hand, the elastic seal body 31 which constitutes the seal member 5 together with the washer 21 is made of a polyurethane-based elastomer resin having an elastic force in the present embodiment, and the middle thereof is the enlarged diameter slope 23 and the reduced diameter. The free end formed in the narrowed portion 32 corresponding to the inclined surface 24 has a short tubular portion 34 formed in the annular raised portion 33 protruding upward from the annular seat plate portion 22, and a plurality of annular lips 35 of the skirt portion 27. It is formed in series with an annular disc portion 36 formed on the seat surface so as to project from the end edge. The annular disc portion 36 is housed and integrated in the seal body accommodating portion 28 and the short tubular portion 34 is The outer peripheral portion is integrated with the diameter-increasing slope 23 and the diameter-decreasing slope 24 of the sloped inner visor 26.

Before tightening the seal member 5 by simply fitting the washer 21 on the screw shaft portion 2 of the bolt 1 with the flat seat 4 side, an elastic seal body protruding upward from the annular seat plate portion 22. Only the annular raised portion 33 on the upper surface of 31 is in contact with the flat seat 4, the annular seat plate portion 22 of the washer 21 is not in contact with the flat seat 4, and the seal member 5 is attached to the screw shaft portion 2 of the bolt 1. When the threaded shaft portion 2 of the bolt 1 is simply inserted into the holes of the fastening member 51 and the fastened member 52 to be overlapped therewith, it is formed on the lower surface of the elastic seal body 31 of the seal member 5. Only the annular lip 35 that is in contact with the fastening member 51, but the edge of the short tubular skirt portion 27 of the washer 21 does not contact the fastening member 51. The narrowed portion 32 is in contact with the screw shaft portion 2 as shown in FIG. In addition, the narrowed portion 32 in the middle of the short tubular portion 34 of the elastic seal body 31 is in contact with the screw shaft portion 2, and the upper end of the screw shaft portion 2, the flat seat 4 of the head 3 and the elastic seal body 31. An annular space 41 having a triangular cross section is formed between the short cylindrical portion 34 and the enlarged diameter slope 23, and the upper cylindrical portion 34 of the screw shaft portion 2, the fastening member 51, and the elastic seal body 31 is formed. Also, an annular space 42 having a triangular cross section is formed between and.

In the bolt seal device having the above-described structure, the seal member 5 has the annular elastic seal body 31 and the annular washer 21 integrated with each other. Only the seal member 5 is fitted to the screw shaft portion 2 of the bolt 1, and then the screw shaft portion 2 is passed through the holes of the fastening member 51 and the member 52 to be fastened to be overlapped therewith, and screwed into the welding nut 53. The installation work can be greatly simplified.

Moreover, the elastic seal body 31 of the seal member 5 has an annular raised portion 33 protruding from the annular seat plate portion 22 at the free end of the short cylindrical portion 34 having the narrowed portion 32 at the middle thereof, and at the base end thereof. Since a plurality of annular lips 35 projecting from the edge of the hem portion 27 of the washer 21 are connected to the annular disc portion 36 formed on the seating surface, the annular ridge 33 is tightened as shown in FIG. 2 during tightening. In the crushed state, the free end of the short tubular portion 34 is brought into close contact with the flat seat 4 on the lower surface of the head portion 2 of the bolt 1, and the seating surface of the annular disc portion 36 is crushed in a state where the annular lips 35 are crushed. Is closely contacted with the tightening member 51, and the annular spaces 41 and 42 are both filled, so that the elastic force due to the deformation of the elastic seal body 31 exerts a superior sealing effect. The wave number of lip 35 If the number is increased, the sealing effect can be further enhanced, and the annular ridge 33 and the annular lip 35 can be accurately deformed with a much lighter tightening force as compared with the conventional elastic seal body to exert the sealing effect. Further, since the end edge of the skirt portion 27 of the washer 21 presses the tightening member 51 without bending, it is possible to maintain appropriate axial force and tightening force. Moreover, since the elastic seal body 31 is integrally provided in the elastic seal body accommodating portion 28 formed inside by forming the skirt portion 27 continuously on the outer peripheral edge of the annular seat plate portion 22, excessive tightening. No force is applied to the elastic seal 31 and overtightening is completely prevented.

[0014]

[Effect of device]

 As is apparent from the above description, the present invention uses the ring-shaped elastic seal body and the washer integrated as the seal member, so that the number of mounting steps can be reduced. Since it is equipped with an annular ridge protruding from the annular seat plate and a plurality of annular lips protruding from the edge of the skirt of the washer, the force required for tightening can be small and the elastic seal body is not damaged. It has a longer life than conventional ones and has excellent repeatability.In addition, since this elastic seal is inside the hem of the washer provided on the outer peripheral edge of the annular seat plate, the seal The rigidity of the washer can be remarkably increased, and the vertical width of the washer can effectively prevent overtightening of the bolts.In addition, the elastic seal body does not stick out after mounting, and the appearance is good. There are a variety of advantages such as the stomach. Therefore, the present invention has a great practical value as a solution to the problems of the conventional bolt seal device.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a state after fastening of the embodiment of the present invention.

FIG. 3 is a partially cutaway front view showing a typical example of a conventional sealing device for a bolt of this type.

FIG. 4 is a partially cutaway front view showing a state after fastening of a typical example of a conventional sealing device for a bolt of this type.

[Explanation of symbols]

 1 Bolt 2 Spiral Shaft 5 Sealing Member 21 Washer 22 Annular Seat Plate 26 Inclined Eave 27 Bottom 28 Elastic Seal Housing 31 Elastic Seal 32 Constriction 33 Annular Ridge 34 Short Tube 35 Annular Lip 36 Annular Board

Front page continuation (72) Yoshihiro Murase, 1-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Pref., Oguchi Plant, Aoyama Manufacturing Co., Ltd. (72) Hiromichi Mizuno 1-8, Takahashi, Oguchi-cho, Niwa-gun, Aichi Company Aoyama Factory Oguchi Factory

Claims (1)

[Scope of utility model registration request] 1. A seal member is provided on a screw shaft portion (2) of a bolt (1).
In a bolt seal device fitted with (5), the seal member (5) includes an annular washer (21) and an annular elastic seal body (31).
And, the washer (21) has a short tubular hem (27) at the outer peripheral edge of the annular seat plate portion (22) whose inner peripheral portion has an inclined eaves (26). And the inside of the elastic seal body storage part (28) is formed, while the elastic seal body (5) is integrally stored in the seal body storage part (28) of the washer (21). At the center of the circularized disc part (36), a short tube part (34) having an intermediate part formed in a narrowed part (32) corresponding to the slanted eaves (26) is continuously provided and the free end thereof is provided with the above-mentioned A plurality of annular lips (35) which form an annular ridge (33) protruding from the annular seat plate (22) and protrude from the end edge of the skirt (27) on the seating surface of the annular board (36).
A bolt sealing device, characterized in that