Temporary attachment and a holder for a member to be held

A threaded portion with thread groove formed and non-threaded portion without the thread groove are prepared on rod-like portion of stud, and non-threaded diameter-increasing portion whose outer diameter is increasing toward thread ridge of screw portion with thread groove formed and non-threaded small diameter portion connecting to small diameter region of non-threaded diameter-increasing portion and having same diameter as that of small diameter region are prepared at threaded portion side edge of non-threaded portion. A holder is provided with stud-receiving hole which receives the rod-like portion, a first locking portion and a second locking portion. The second locking portion is engaged with the non-threaded small diameter portion in a fixedly holding status, and the second locking portion is engaged with the non-threaded diameter-increasing portion in a status that the holder is moved for a predetermined amount in a direction away from the fixedly holding status.

TECHNICAL FIELD

The present invention relates to a temporary attachment which comprises a stud that consists of a rod-like portion and a head integrally prepared on the base side of this rod-like portion and a holder that is assembled with said rod-like portion of this stud and holds a member to be held (for instance, a member such as a bracket) in conjunction with said stud, and said holder in this temporary attachment.

BACKGROUND ART

The temporary attachment of the above-mentioned member to be held is used, for instance, when temporarily attaching an appropriate (member to be held) in an assembly of a vehicle, and a holder configured so as to increase its holding force to a stud is described in the following Patent Document 1 (PTL1), for example.

CITATION LIST

Patent Literature

SUMMARY OF INVENTION

The holder described in the above-mentioned Patent Document 1 is provided with a lot (two pairs, four) of stud locking portions having a nail portion for fitting into a thread groove formed on a stud and is elastically engaged with a rod-like portion of the stud and thereby its holding force is increased. In such a holder, since all the nail portions of each stud locking portion are fitting into the thread grooves of the stud, a force for preventing the holder from loosening when expected engaging force with the stud is acquired at the nail portion of each stud locking part. However, when the engaging force of each stud locking portion with the stud decreases due to creep deterioration of each stud locking portion etc., the holder will come to rotate with respect to the thread groove on the stud, and there is a possibility that the holder may be separated (detached) from the stud.

The present invention has been made in order to cope with the above-mentioned problems (prevent the holder from being separated from the stud), and is a temporary attachment for a member to be held, which comprises:

a stud that consists of a rod-like portion and a head integrally prepared on the base side of this rod-like portion, in which a threaded portion with a thread groove formed on its outer periphery surface is prepared on the tip side of said rod-like portion, and a non-threaded portion without said thread groove is prepared on the base side of said rod-like portion, a non-threaded diameter-increasing portion whose outer diameter is increasing toward the thread ridge formed on said threaded portion is prepared at the threaded portion side edge of said non-threaded portion, and a non-threaded small diameter portion connecting to a small diameter region being a region in this non-threaded diameter-increasing portion with the smallest diameter and having the same diameter as that of the small diameter region, and

a holder that is assembled with said rod-like portion of this stud and holds (temporarily attaches) said member to be held in conjunction with said stud, and

characterized in that:

said holder is provided with a stud-receiving hole which receives said rod-like portion, a first locking portion which has a nail portion for fitting into said thread groove, and a second locking portion which has a nail portion for engaging with said non-thread portion of said rod-like portion, and said first locking portion can be elastically engaged with said threaded portion and said second locking portion can be elastically engaged with said non-threaded portion when said rod-like portion is received in said stud-receiving hole, and

said holder is configured so that said first locking portion is engaged with said threaded portion and said second locking portion is engaged with said non-threaded small diameter portion in a fixedly holding status that said member to be held is fixedly held with said stud and said holder, and said first locking portion is engaged with said threaded portion and said second locking portion is engaged with said non-threaded diameter-increasing portion in a status that said holder is moved for a predetermined amount in a direction away from said fixedly holding status.

Moreover, the present invention has been made in order to cope with the above-mentioned problems, and is a holder which is assembled with a rod-like portion of a stud that consists of a rod-like portion and a head integrally prepared on the base side of this rod-like portion, in which a threaded portion with a thread groove formed on its outer periphery surface is prepared on the tip side of said rod-like portion, and a non-threaded portion without said thread groove is prepared on the base side of said rod-like portion, a non-threaded diameter-increasing portion whose outer diameter is increasing toward the thread ridge formed on said threaded portion is prepared at the threaded portion side edge of said non-threaded portion, and a non-threaded small diameter portion connecting to a small diameter region being a region in this non-threaded diameter-increasing portion with the smallest diameter and having the same diameter as that of the small diameter region, and holds a member to be held in conjunction with said stud, and

characterized in that:

said holder is provided with a stud-receiving hole which receives said rod-like portion, a first locking portion which has a nail portion for fitting into said thread groove, and a second locking portion which has a nail portion for engaging with said non-thread portion of said rod-like portion, and said first locking portion can be elastically engaged with said threaded portion and said second locking portion can be elastically engaged with said non-threaded portion when said rod-like portion is received in said stud-receiving hole, and

said holder is configured so that said first locking portion is engaged with said threaded portion and said second locking portion is engaged with said non-threaded small diameter portion in a fixedly holding status that said member to be held is fixedly held with said stud and said holder, and said first locking portion is engaged with said threaded portion and said second locking portion is engaged with said non-threaded diameter-increasing portion in a status that said holder is moved for a predetermined amount in a direction away from said fixedly holding status.

In the “temporary attachment for a member to be held” and the “holder” according to the present invention, even when the engaging force of the first stud locking portion with the thread groove formed on the rod-like portion of the stud decreases due to creep deterioration of the first stud locking portion prepared in the holder etc. and thereby the holder rotates in a direction in which the holder is detached from the stud, said second locking portion in the holder comes to be engaged with (run upon) the non-threaded diameter-increasing portion from the non-threaded small diameter portion, while the first locking portion in the holder is engaged with the threaded groove of the stud, in a status that the holder is moved for a predetermined amount in a direction away from the fixedly holding status. In this case, the second locking portion runs from the non-threaded small diameter portion upon the non-threaded diameter-increasing portion and thereby the engaging force of the second locking portion with the rod-like portion of the stud increases, and the engaging force (rotation restriction force) of the holder (the first locking portion and the second locking portion) with the stud (rod-like portion) increases. For this reason, thereafter, the rotation of the holder with respect to the stud is suppressed, the holder is prevented from loosening, and the secession of the holder from the stud is prevented.

DESCRIPTION OF EMBODIMENTS

Hereafter, embodiments of the present invention will be explained based on drawings.FIG. 1toFIG. 6show one embodiment of the present invention schematically. In this embodiment, the “temporary attachment for a member to be held” comprising the stud30and the holder40is used when the brake pedal bracket20(member to be held) is temporarily attached to the module bracket10(base) for fixing a brake pedal unit, on assembling a vehicle. In addition, the module bracket10is configured so as to be fixed to a vehicle body.

The stud30has the rod-like portion31and the head32integrally prepared in the base portion (lower region in the drawings) of the rod-like portion31. The stud30has been integrally fixed to the module bracket10by welding at the head32. The rod-like portion31consists of the threaded portion31A and the non-threaded portion31B. The threaded portion31A is formed on the tip side (upper side in the drawings) of the rod-like portion31and has a predetermined diameter, and the thread groove31a1with a predetermined pitch is formed on its outer periphery surface.

The non-threaded portion31B is constituted by the non-threaded large diameter portion31b1, the non-threaded small diameter portion31b2and the non-threaded diameter-increasing portion31b3formed in the order from the base side (lower side in the drawings) toward the tip side of the rod-like portion31. The non-threaded large diameter portion31b1has a shape of a cylinder with the approximately same diameter as that of the threaded portion31A. The non-threaded small diameter portion31b2is formed to be connected to the small diameter region with the smallest diameter of the non-threaded diameter-increasing portion31b3, and has a shape of a cylinder with the same diameter as that of the small diameter region. The non-threaded diameter-increasing portion31b3has a shape of a circular truncated cone whose outer diameter expands towards the thread ridge31a2of the screw portion31a(threaded portion31A) on which the thread groove31a1is formed.

The above-mentioned stud30is manufactured by processing the thread groove31a1into a portion of the rod-like portion31(threaded portion31A) in a material status formed in a predetermined shape.

The holder40is made of a resin, and while the stud-receiving hole41, the first locking portion42, and the second locking portion43are prepared, the stopper piece44and the stopper protrusion45are prepared. The stud-receiving hole41is prepared in the axial center portion of the holder40, opens at its lower side in the drawings, and is configured to be able to receive the rod-like portion31of the stud30.

A left-and-right pair of the first locking portions42is prepared inFIG. 2,FIG. 4andFIG. 5, has a nail portion42afor fitting into the thread groove31a1of the stud30, and is elastically engaged with the rod-like portion31. In addition, according to the pitch of the thread groove31a1, the heights (dispositions) of the nail portions42aon right and left in the drawings are shifted mutually half a pitch.

A left-and-right pair (an up-and-down pair inFIG. 4) of the second locking portion43is prepared inFIG. 3andFIG. 6, has the nail portion43awhich engages with the non-threaded portion31B of the rod-like portion31, and is elastically engaged with the rod-like portion31. It is set that the heights (dispositions) of the nail portions43aon right and left in the drawings are identical, each nail portion43ais engaged with the non-threaded small diameter portion31b2in the state ofFIG. 3(fixedly holding status that the member to be held20is fixedly held with the stud30and the holder40), and each nail portion43ais engaged with (runs upon) the non-threaded diameter-increasing portion31b3in the state ofFIG. 6(status that the holder40has been moved for a predetermined amount in a direction away from the fixedly holding status).

When the holder40is fitted with the rod-like portion31of the stud30and it will be in the fixedly holding status ofFIG. 2andFIG. 3, the stopper piece44and the stopper protrusion45come into contact with the brake pedal bracket20to function, and six of them are formed to be equally spaced in a circumferential direction, respectively. In addition, each stopper piece44has a function which buffers the collision with the brake pedal bracket20. Moreover, each stopper protrusion45has a function to define the maximum amount of fitting of the holder40with the rod-like portion31.

In the above-mentioned embodiment, as shown inFIG. 1andFIG. 2on assembling a vehicle, the holder40is fitted with the rod-like portion31of the stud30, and the brake pedal bracket20(member to be held) is temporarily attached to the module bracket10(basis). In addition, the holder40will not be detached, even after the module bracket10and the brake pedal bracket20are finally attached and fixed to a vehicle body.

By the way, in this embodiment, even if the engaging force of the first locking portion42with the thread groove31a1formed in the rod-like portion31of the stud30decreases and the holder40rotates in a direction in which the holder40is detached from the stud30from the status ofFIG. 2andFIG. 3, in a status that the holder is moved for a predetermined amount in a direction away from the fixedly holding status, as shown inFIG. 5andFIG. 6, the second locking portion43in the holder40comes to be engaged with (run upon) the non-threaded diameter-increasing portion31b3from the non-threaded small diameter portion, while the first locking portion42in the holder40is engaged with the threaded groove31a1of the stud30.

In this case, the second locking portion43runs from the non-threaded small diameter portion31b2upon the non-threaded diameter-increasing portion31b3and thereby the engaging force of the second locking portion43to the rod-like portion31of the stud30increases, and the engaging force (rotation restriction force) of the holder40(the first locking portion42and the second locking portion43) with the stud30(rod-like portion31) increases. For this reason, thereafter, the rotation of the holder40with respect to the stud30is suppressed, the holder40is prevented from loosening, and the secession of the holder40from the stud30is prevented

Moreover, in accordance with this embodiment, in a stud material formed into a predetermined shape, the suppression of the rotation of the holder40with respect to the stud30can be carried out inexpensively by the engaging force acquired by elastically engaging the second locking portion43with the simple non-threaded portion31B of the stud30manufactured by processing the thread groove31a1into a portion (threaded portion31A) of the rod-like portion31in a material status.

Although a pair of the first locking portions42and a pair of the second locking portions43were formed respectively for carrying out the present invention in the above-mentioned embodiment, the numbers of the first locking portions42and the second locking portions43can be properly increased or decreased and are not limited to the above-mentioned number, on carrying out the present invention.

REFERENCE SIGNS LIST