JPH064417U - Tightening bolt loosening prevention structure - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To prevent the tightening bolt from loosening with a simple structure. [Structure] The closing member 7 is fitted into the opening 5a of the exterior member 5 by meshing with the cornered opening edge and the outer edge, and the closing member 7 and the tightening bolt 4 are provided with a cornered projection 7a and a receiving groove 4a. Is provided, and the tightening bolt 4 is fixed to the closing member 7 by turning them.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a loosening prevention structure for a fastening bolt used to stop various members from each other.

[0002]

[Prior art]

 Conventionally, for example, when attaching an armrest of an automobile seat to a side portion of a seatback, a downwardly U-shaped bracket 2 is projectingly provided on a side portion near a base of an armrest frame 1 as shown in FIG. The rotary shaft 3 of the armrest is inserted into the bracket 2, and the tightening bolts 4 which are inserted into the shaft portion from the direction orthogonal to the rotary shaft 3 are suspended and fixed between the side surfaces of the bracket 2 to fix the rotary shaft 3 of the armrest to the bracket 2. Bearing is performed in. Further, the bolting point is also encased by fitting the exterior member 5 to the outside of the bracket 2 so as not to be exposed to the outside from the appearance.

In this type of tightening bolt, the tightened state is apt to loosen due to vibration caused by the running of the automobile and rattling due to the load of the user, and when the loosening progresses, the tightening bolt comes off from the bracket 2. The situation such as doing occurs. In order to prevent the loosening of the tightening bolt, a lock member may be assembled separately or a tightening bolt having a special locking structure may be used, but this is not preferable because it increases the number of parts and increases the cost. .

[0004]

[Problems to be solved by the device]

 The present invention is a tightening bolt that is designed to prevent the tightening bolt from loosening by using a member arranged outside the bolt fastening point, specifically, an exterior member fitted to the outside of various members that can be fastened with the tightening bolt. The purpose of the present invention is to provide a structure for preventing loosening.

[0005]

[Means for Solving the Problems]

 In the tightening bolt loosening prevention structure according to claim 1 of the present invention, an exterior member that covers at least the bolted portion is fitted on the outer side of various members to which the tightening bolt is stopped, and the ends of the tightening bolt are in relative positions. An opening whose corner is attached to the rim is provided on at least one side of the exterior member to be fitted, and a closing member whose outer edge is formed in the same shape as the rim of the opening is fitted into the mouth of the opening, and Providing a projection and a receiving groove of the same shape whose corners are attached to the peripheral surface on the respective opposing surfaces of the closing member and the end of the tightening bolt, and fitting these together to fix the tightening bolt to the closing member by turning. It is composed of In the tightening bolt loosening prevention structure according to the second aspect, the rim of the opening is formed into a gear tooth shape, and the outer edge is formed in the mouth of the opening in the same shape as the rim of the opening. The closing member is fitted and the closing member is firmly fixed to the outer layer member by being fixed.

[0006]

[Action]

 In the tightening bolt loosening prevention structure according to claim 1 of the present invention, the closing member is fitted into the opening of the exterior member while being prevented from being rotated by the angular engagement, and the projection of the closing member and the tightening bolt and the receiving groove are fitted together. Since the tightening bolts are fixed to the closing member with the engagement of the corners, the tightening bolts can be prevented from loosening with a simple structure and at low cost without using special tightening bolts or unnecessary components.

In the tightening bolt loosening prevention structure according to the second aspect of the present invention, the closing member is fitted into the opening of the exterior member by firmly meshing with the gear tooth-shaped lip and the outer edge. , It is possible to sufficiently oppose rotation of the tightening bolt in the loosening direction.

[0008]

【Example】

 1 to 4, the tightening bolt loosening prevention structure is applied to attach an armrest of a vehicle seat to a side portion of a seatback, as shown in FIG. In each figure, common members shown in FIG. 5 are designated by the same reference numerals. As common members, 1 is an armrest frame, 2 is a downward U-shaped bracket projecting from the side of the armrest frame 1 toward the base, 3 is an armrest rotating shaft, 4 is a tightening bolt, and 5 is a bracket. 2 shows an external member fitted to the outer side of 2.

The tightening bolt 4 shown in FIG. 1 is provided with a round bar-shaped shaft portion 4a, a disc-shaped head portion 4b at one shaft end thereof, and a screw portion 4b at the other shaft end side thereof. The attached one is used. In addition to these parts 4a, 4b, 4c, the tightening bolt 4 is provided with a receiving groove 4d having a corner such as a hexagon on the plate surface of the head 4b. The tightening bolt 4 is used to insert the shaft portion 4a into the rotary shaft 3 from a direction orthogonal to the rotary shaft 3 so as to be suspended and fixed to both side surfaces of the bracket 2, and the both side surfaces of the bracket 2 have the shaft portion 4a. An insertion hole 2a and a screwing hole 2b for the screw portion 4c are provided. Further, an insertion hole 3a of the shaft portion 4a is provided in the orthogonal direction so as to penetrate the side surface of the rotary shaft 3. The tightening bolt 4 can be fixed to the bracket 2 simply by screwing the screw portion 4c into the screw hole 2b, but by screwing the nut 6 onto the shaft portion of the screw portion 4c protruding from the side surface of the bracket 2, You may fix it. The nut 6 can be welded and fixed to the bracket 2 in advance, or can be independently screwed when the tightening bolt 4 is attached.

As the exterior member 5, a resin molded product such as polyethylene can be used. The exterior member 5 may be of a size large enough to cover at least the bolted portion by the tightening bolt 4 depending on the member to be adhered, but in the embodiment shown in FIG. 1, the appearance is kept good. Therefore, it is formed in a size that encloses the entire bracket 2. Further, the exterior member 5 is provided with an opening 5a on at least one side surface where the ends of the tightening bolt 4 are positioned relative to each other. The opening 5a is for fitting and fixing a closing member, which will be described later, and is provided on one side surface of the exterior member 5 with which the head 4b of the tightening bolt 4 is positioned. In addition to the opening 5, a receiving hole 5b sufficient for fitting the head 4b of the tightening bolt 4 is provided concentrically with the opening 5a so as to be relatively small with a step. Among them, the opening 5a is provided as having a square or hexagonal corner at the hole edge, and preferably has a gear tooth-shaped edge as shown in FIG.

In addition to the above-described members, the tightening bolt loosening prevention structure includes a closing member 7 that is fitted into the opening 5 a of the exterior member 5 as a necessary member. The closing member 7 is formed so that its outer edge has the same shape as the mouth edge of the opening 5a, and it is preferable to use the same material as the resin forming the exterior member 5. Further, the closing member 7 is integrally provided with a projection 7a of the same shape that fits into the receiving groove 4d provided on the head 4b of the tightening bolt 4 described above.

In order to assemble the armrest of the automobile seat from the respective members so as to be attached to the side portion of the seatback, after inserting the rotary shaft 3 of the armrest inside the bracket 2, the shaft portion 4a of the tightening bolt 4 is inserted. Is inserted into the insertion hole 3a of the rotary shaft 3 from the insertion hole 2a of the bracket 2 and the screw portion 4c is screwed into the screw fixing hole 2b or the nut 6 of the bracket 2 so that the tightening bolt 4 is placed between the side surfaces of the bracket 2. Fix it in transit. After the screwing of the tightening bolt 4, the exterior member 5 is elastically deformed to some extent and fitted on the outer side of the bracket 2 so that the head 4b of the tightening bolt 4 is positioned within the diameter of the receiving hole b. It can be fitted to the bracket 2 so as to cover the whole. After fitting the exterior member 5, the closing member 7 may be inserted into the opening 5a of the exterior member 5 and the projection 7a may be press-fitted into the receiving groove d of the tightening bolt 4. If the nut 6 is not screwed to the tightening bolt 4 during this procedure, the outer member 5 should be fitted to the bracket 2 and then the tightening bolt 4 should be inserted from the receiving hole 5a of the outer member 5 and fixed to the bracket 2. You can

In the mounting structure of the armrest frame 1 using the tightening bolts 4, as shown in FIG. 2, the closing member 7 is fitted into the opening 5 a of the exterior member 5 while being prevented from turning at an angle, and at the same time, the closing member 7 is closed. The projections 7a are engaged with the receiving grooves 4d of the tightening bolts at the corners. Therefore, the tightening bolt 4 is pivotally supported by the closing member 7 fitted in the exterior member 5 so as to be prevented from rotating, thereby preventing the tightened state from rotating in the loosening direction. Since the closing member 7 is engaged with the opening 5a of the exterior member 5 and meshed with the gear tooth-shaped outer edge, the tightening bolt 4 can be securely prevented from loosening. Further, if the closing member 7 is made of the same material as the exterior member 5, it is not conspicuous, so that it does not spoil the appearance and forms a part of the exterior member 5, and therefore does not increase the cost. In addition, the closing member 7 can fix the exterior member 5 to the tightening bolt 4 and prevent the exterior member 5 from coming off the bracket 2.

In the above-described embodiment, the protrusion 7a for fixing the closing member 7 and the tightening bolt 4 to each other is provided in the closing member 7 and the receiving groove 4d is provided in the tightening bolt 4, but, conversely, FIG. , 4, the receiving groove 7a 'is provided in the closing member 7 so that the projection can also serve as the head 4b' of the tightening bolt 4. Also, the case where the opening 5a of the exterior member 5 and the closing member 7 are provided on the side facing the heads 4b and 4b 'of the tightening bolt 4 has been described, but it is on the side facing the threaded portion 4c of the tightening bolt 4. The same function can be provided even if provided, and both can be provided if necessary.

[0015]

[Effect of device]

 As described above, according to the tightening bolt loosening prevention structure of the present invention, it is possible to prevent the tightening bolt from loosening without using a special member, which does not increase the cost and does not damage the appearance.

[Brief description of drawings]

FIG. 1 is an expanded view showing a locking bolt loosening prevention structure according to an example of the present invention.

FIG. 2 is an explanatory view showing the structure in section.

FIG. 3 is an explanatory view showing another tightening bolt and a closing member constituting the tightening bolt loosening prevention structure according to the present invention.

FIG. 4 is an explanatory view showing, in a partial cross section, a locking structure using the tightening bolt and the closing member of FIG.

FIG. 5 is an explanatory view showing an assembly member using a tightening bolt according to a general example.

[Explanation of symbols]

 4 Tightening bolt 5 Exterior member 5a Opening 7 Closing member 4a, 7a 'Receiving groove 7a, 4b' Protrusion

Claims (2)

[Scope of utility model registration request] 1. An exterior member that covers at least the bolted portion is fitted on the outside of various members to which the tightening bolt is fastened, and an edge is formed on at least one side surface of the exterior member with which the end of the fastening bolt is located at a corner. An attached opening is provided, and a closing member whose outer edge is formed in the same shape as the opening edge is fitted in the mouth of the opening, and the relative surfaces of the closing member and the end of the tightening bolt. A tightening bolt loosening prevention structure, characterized in that a projection and a receiving groove of the same shape whose corners are attached to the peripheral surface are provided, and these are fitted to each other to fix the tightening bolt to the closing member by turning. 2. The edge of the opening is formed into a gear tooth shape,
2. The tightening bolt according to claim 1, wherein a closing member whose outer edge is formed in the same shape as that of the opening edge is fitted in the mouth of the opening, and the closing member is firmly fixed to the outer layer member by turning. Anti-loosening structure.