JP3526953B2 - bush - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a mounting hole provided in one of two members to be attached to each other and to the other member. A bush that includes a through hole for a screw that is screwed into the female screw portion, and that is interposed between the screw that is screwed into the female screw portion and the mounting hole of one of the members to assemble the two members in a buffered state. . 2. Description of the Related Art A rubber bush 100 shown in FIGS. 9 and 10 has conventionally been used for assembling two members attached to each other using a screw in a buffered state. This bush 100 has a cylindrical portion 101 having an insertion hole 101a into which a rod S 'of a screw S is inserted.
Are provided with outwardly directed flanges 102, 102 at both cylinder mouths. Therefore, as shown in FIG. 10, the bush 100 is attached to a mounting hole P ′ formed in a panel P having a diameter substantially equal to the outer diameter of the cylindrical portion 101.
By pressing one of the cylinder ends of the cylinder 101, the flange 102 on the cylinder end can be bent inward and inserted into the mounting hole P '.
By elastically restoring the flange 102 protruding from the mounting hole P 'on the back side of the panel P, the hole edge of the mounting hole P' is sandwiched between facing surfaces of the two flanges 102, 102, It can be mounted in the mounting hole P '. [0004] Then, as described above, the mounting hole P 'of the panel P is provided.
The rod S ′ of the screw S is inserted into the insertion hole 101a of the bush 100 mounted on the
Is screwed into the female screw portion K ′ of the mounting rod K provided on another member to which the panel P is mounted, so that the member provided with the mounting rod K is screwed. The panel P was mounted in a buffered state. [0005] However, the conventional rubber bush 10
0, since the flange 102 is provided at one end of the cylindrical portion 101 so as to surround the cylindrical opening of the cylindrical portion 101, the cylindrical portion 10 is attached to the mounting hole P ′.
It takes a considerable insertion force to bend the flange 102 until one of the cylinder ends can pass through the mounting hole P ', which makes it difficult to mount the bush 100 in the mounting hole P'. I was If the thickness of the flange 102 is reduced, the flange 102 can be easily bent and deformed, and the insertion force into the mounting hole P 'can be reduced. The strength of the
The external force applied to the flange 102 causes the flange 102
Of the bush 100, causing damage or deformation of the bush 100.
Since it is difficult to stably secure the mounting state of the flange 102, there is a limit in reducing the thickness of the flange 102 to reduce the insertion force into the mounting hole P '. In particular, a printed circuit board to be mounted on a chassis or the like of various electronic devices is mounted in a buffered state with respect to the chassis or the like so as not to directly transmit vibration or the like caused by an external force applied to the chassis to the printed circuit board. However, since the printed circuit board and the like are required to be configured as compactly as possible due to the demand for downsizing electronic devices, the printed circuit board is mounted on a chassis or the like. The mounting space for the bushing is also minimized. Therefore, in this type of printed circuit board, the bush 100 and the bush 10
Also, the mounting hole P 'for mounting the "0" has a diameter as small as possible. As described above, when the size of the bush 100 is reduced, the strength of the flange 102 cannot be secured unless the thickness of the flange 102 is increased to some extent. In the bush 100, particularly, ease of insertion into the mounting hole P 'and reduction of insertion force have been demanded. Therefore, the present invention firstly mounts a bush for assembling two members attached to each other using a screw in a buffered state without resistance to a mounting hole provided in one of the members. The purpose is to make it possible. Secondly, it is another object of the present invention to stably secure a mounting state of the bush in the mounting hole. In order to achieve the above object, according to the first aspect of the present invention, an insertion of a screw S screwed into a female screw portion K 'provided on a first member is provided. The screw S, which is provided in the mounting hole P ′ of the second member and is inserted into the insertion hole 3, is screwed with the female screw portion K ′ of the first member, A plurality of bushings B for attaching a second member to the above-mentioned members are spaced apart from one another from one side of the head 1 and protrude along the hole edge of the insertion hole 3. Elastic leg pieces 2, 2, ...
And an engaging projection 2a protruding from the distal end side of the elastic leg piece 2 toward the head 1 side.
Between the engaging projection 2a and the head 1;
Said second member 'sandwiching the hole edge of the mounting hole P' mounting holes P of fastened to, there a configuration to be mounted, deer
Also, the insertion hole 3 is formed in the head 1 from the outer edge of the head 1.
.. Having a plurality of grooves 1a, 1a,.
The head 1 is divided into the grooves 1a by these grooves 1a.
a plurality of constituent parts 1 ′ that can be elastically deformed around a,
1 ′, and the constituent parts 1 ′, 1 ′,.
The elastic leg piece 2 is projected from the
The portion 2a is directed from the tip side of the elastic leg piece 2 to the head 1 side.
And an inclined surface 2a 'inclined outwardly . According to the first aspect of the present invention, there is provided the insertion hole 3 of the screw S screwed into the female screw portion K 'provided in the first member, and the mounting hole P' of the second member. The bush B is attached to the first member, and the screw S inserted into the insertion hole 3 is screwed into the female screw portion K ′ of the first member, and the second member is attached to the first member. The part 1 and a plurality of elastic leg pieces 2, 2, ... which are spaced from one side of the head 1 and protrude along the hole edge of the insertion hole 3.
And an engaging projection 2a protruding from the distal end side of the elastic leg piece 2 toward the head 1 side.
Between the engaging projection 2a and the head 1;
Since a configuration is provided in which the hole edge of the mounting hole P ′ of the second member is clamped and fastened to the mounting hole P ′, the mounting hole P ′ is attached to the mounting hole P ′ of the second member. By inserting the bush B from the tip side of the plurality of elastic legs 2, 2,..., Each of the elastic legs 2, 2,... Makes the engaging projection 2a contact the hole wall of the mounting hole P ′. And is bent toward the insertion hole 3 side and inserted into the mounting hole P ′.
It is elastically restored at a position where the engagement protrusion 2a protrudes from the insertion hole 3 on the side opposite to the insertion side, and the mounting hole is provided between the engagement protrusion 2a and the head 1. As a result, the hole edge of P ′ is clamped, whereby the bush B is fastened and mounted in the mounting hole P ′. According to the first aspect of the present invention, the head 1 of the bush B is provided with a plurality of grooves 1a, 1a,... Which are directed from the outer edge of the head 1 toward the center of the insertion hole 3. The head 1 is elastically deformable around the groove 1a by the grooves 1a, 1a.
Together they are divided into ..., the component 1 ', 1' ... the elastic leg piece 2 is projecting from the tare is, furthermore, the engaging projection 2
a, the elastic leg piece 2 extends outward from the distal end side toward the head 1 side.
Since it has a configuration in which the inclined surface 2a 'is inclined in an expanding manner, the plurality of elastic leg pieces 2, 2,... Are inserted into the mounting holes P' of the second member from the distal end side. Each of the constituent parts 1 ', 1',... Is deformed so as to bend toward the projecting side of the elastic leg piece 2 around the groove 1a, so that each of the elastic leg pieces 2, 2,. , The amount of bending of each of the leg pieces 2, 2,... Can be increased, and as a result, the insertion force of each of the elastic leg pieces 2, 2,. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of a bush according to the present invention will be described below with reference to FIGS. FIG. 1 shows a mounting rod K provided on a first member via a bush B by a screw S inserted into an insertion hole 3 of the bush B according to this embodiment.
The panel P, the mounting rod K, the screw S, and the bush B as a second member attached to the panel are separated and shown in a perspective view so as to be easily understood. FIG. 2 shows a state in which the distal end of the elastic leg 2 of the bush B is inserted into the mounting hole P 'so that the elastic leg 2 is inserted into the mounting hole P' formed in the panel P. The bush B is shown as a state of a side cross section. FIG. 3 shows a mounting hole P 'of the panel P.
A screw S inserted into the insertion hole 3 of the bush B via the bush B mounted on the first member and screwed to the female thread K 'of the mounting rod K provided on the first member.
Accordingly, a state in which the panel P is attached to the first member is shown as a state of a side cross section of the panel P, the mounting rod K, and the bush B. FIGS. 4 to 8 show a side view of the bush B (FIGS. 4 and 5) and a plan view, that is, a head, so that the structure of the bush B according to this embodiment can be easily understood. When viewed from the side of the part 1 (FIG. 7), and viewed from the bottom surface, that is, from the side where the elastic leg piece 2 is protruded (FIG. 8), the main part is sectioned when viewed from the side (FIG. 6) , Respectively. In the bush B according to this embodiment shown in each of the above-described drawings, the first member having the female screw portion K 'screwed to the screw S is different from the first member having the female screw portion K'. It is used for mounting using a screw, and is provided with an insertion hole 3 for a screw S, is fitted in a mounting hole P ′ opened in the second member, and is inserted through the insertion hole 3. In addition, the second member is interposed between the screw S screwed to the mounting rod K ′ and the mounting hole P ′ of the second member so that the second member is buffered with respect to the first member. Used to assemble. Further, the second member is assembled to the first member in a state where vibration of the first member due to an external force applied to the first member or the like is not transmitted to the second member as it is. Used for For example, typically, in the bush according to this embodiment, the mounting hole P 'is provided in a chassis of an electronic device having a female screw portion K' to be screwed to the screw S. In order to mount a panel P such as a printed board in a buffered state, the panel P is used by being fitted in a mounting hole P ′ of the panel P in a fitted state. From the viewpoint of enhancing the buffer function,
The bush B according to this embodiment is desirably formed by using a plastic elastic material and a rubber elastic material having appropriate elasticity. First, FIG. 1, FIG. 4, FIG. 5, FIG. 7, and FIG.
As particularly shown in FIG.
A substantially disk-shaped head 1 and four elastic leg pieces 2 provided from one side of the head 1 so as to protrude in a direction substantially perpendicular to the surface of the head 1 on one side thereof. , And so on. The head 1 has a substantially circular insertion hole 3 at a substantially central portion thereof, into which the rod S 'of the screw S can be inserted. The four elastic leg pieces 2, 2,... Protrude at intervals from each other on the circumference along the hole edge 3a of the insertion hole 3. That is, the four elastic leg pieces 2, 2,...
As shown in particular in FIG. 8, they are spaced apart from one another as described above by four gaps 4, 4... The four elastic leg pieces 2, 2,... Are each configured to gradually increase in thickness in a horizontal section from the insertion hole 3 side toward the outside. The four elastic leg pieces 2, 2... Face the side facing the insertion hole 3 side with the hole edge 3a of the insertion hole 3.
, And the outer surface is an arc-shaped surface which is substantially concentric with the insertion hole 3 having a substantially circular shape. As shown particularly in FIGS. 4 and 5, the distal ends of the elastic legs 2, 2,... An engagement projection 2a is provided to project toward the side. The engagement projection 2a extends in the width direction of the elastic leg piece 2 and extends outward from the distal end side toward the head 1 side. At a position approximately halfway in the protruding direction of the elastic leg piece 2 at which the inclined surface 2a 'ends, and the elastic leg of the head 1 at a position approximately in the middle of the projecting direction of the elastic leg piece 2 where the inclined surface 2a' ends The bush B according to this embodiment is provided with a step surface 2a "which faces substantially parallel to the surface of the piece 2 on the protruding base side.
The panel P is formed so as to make the hole diameter smaller than the dimension between the outer surfaces of the engagement protrusions 2a of the pair of elastic leg pieces 2, 2 located on both sides in the diameter direction of the insertion hole 3. By being inserted into the mounting hole P ′ from the distal end side of the elastic leg piece 2, the respective elastic leg pieces 2 are once directed toward the insertion hole 3 as shown in FIG. After being bent, the engaging projection 2a is cut from the hole edge on the back side of the mounting hole P '.
Are elastically returned by being inserted into the protruding position, and the head 1 is attached to the edge of the hole on the front side of the mounting hole P ′, and the hole on the back side is inserted. The stepped surface 2a "of the engaging projection 2a is brought into contact with the edge, and can be mounted in the mounting hole P 'of the panel P. The elastic leg piece 2 of the head 1 is also provided. The dimension from the projecting side surface to the step surface 2a "of the engaging projection 2a of the elastic leg piece 2 is set to be substantially equal to the thickness of the panel P in which the mounting hole P 'is formed. 3, the head 1 and the stepped surface 2 of the engaging projection 2a
a ″ can be attached to the mounting hole P ′ in a state of being in close contact with the surface of the panel P, and can be attached to the panel P such that there is no play in the vertical direction. In this embodiment, in particular, a projection 2b is provided on the step surface 2a "of the engaging projection 2a at a substantially middle position in the width direction of each of the elastic leg pieces 2, 2,. The stepped surface 2 of the engaging projection 2a of the elastic leg piece 2 from the surface of the head 1 on the side where the elastic leg piece 2 protrudes from the plate thickness.
Even if the dimension up to a ″ is slightly larger, a part of the projection 2b is crushed to form the mounting hole P ′ of the panel P.
By making contact with the hole edge 3a, the bush B can be mounted in the mounting hole P 'of the panel P without play. As described above, the bush B according to this embodiment
Can be attached to the mounting hole P 'by one-touch only by inserting it into the mounting hole P' of the panel P from the front end side of the elastic leg piece 2, and thereafter, A screw S is inserted from the front side of the panel P into the insertion hole 3 provided, and the rod S ′ provided with the male screw of the inserted screw S is inserted into the female screw K ′ of the mounting rod K. By screwing, the panel P can be easily attached to the attaching rod K. In addition, bush B
Is mounted on the mounting hole P ′ by pressing the projection 2b provided on the elastic leg piece 2 in a crushing state, thereby bringing the elastic leg piece 2 into close contact with the hole edge of the mounting hole P ′. Operation of inserting the screw S into the insertion hole 3,
In the operation of screwing the rod S ′ of the inserted screw S into the female thread K ′ of the mounting rod K, the bush B does not rotate even when the screw S is rotated. The operation is assumed to be smooth. In the bush B according to this embodiment,
Since the hole diameter of the insertion hole 3 and the dimension between the inner surfaces of the pair of elastic leg pieces 2 and 2 on both sides in the diameter direction of the insertion hole 3 are substantially the same as the diameter of the rod S ′ of the screw S. ,
By inserting the screw S into the insertion hole 3 and screwing with the mounting rod K, the elastic leg piece 2 makes the inner surface contact the rod S ′ of the screw S, so that the elastic leg piece 2 is bent inward. The insertion of the screw S makes the mounting of the bush B into the mounting hole P 'more reliable. In the bush B according to this embodiment,
Four grooves 1a, 1a provided on the surface of the head 1 opposite to the side on which the elastic leg pieces 2 protrude, from the outer edge 1b of the head 1 toward the center of the insertion hole 3. The head 1 is divided into four components 1 ', 1' by the grooves 1a, 1a. Each of the elastic leg pieces 2, 2 is provided so as to project from each of the constituent parts 1 ', 1',... Of the head 1. That is, the four grooves are formed on the surface of the head 1 on the side opposite to the side where the elastic leg pieces 2 protrude, along the gaps 4 between the elastic leg pieces 2. Are provided respectively. As a result, the head 1 is attached to each of the elastic legs 2
The groove 1a, 1a is provided on each side with the groove 1a, and the portion where the groove 1a is provided is made thin by the grooves 1a, 1a, so that the component part 1 'divided by the grooves 1a, 1a Can be elastically deformed around the grooves 1a, 1a. Therefore, as shown in FIG. 2, when the elastic leg piece 2 of the bush B is inserted into the mounting hole P 'of the panel P from the front end thereof, it is inserted into the hole wall of the mounting hole P'. The elastic leg 2 is bent inward by bringing the engaging projection 2a into contact with the engaging leg 2a. At this time, the component 1 'of the head 1 on which the elastic leg 2 is projected is also the same. The elastic leg 2 is elastically deformed toward the projecting side of the elastic leg 2 around the grooves 1a, 1a provided on both sides of the component 1 '. As a result, the elastic leg 2 is easily bent. , Each elastic leg piece 2, 2
... can be increased, and the mounting hole P '
Can be smoothly inserted into the mounting hole P 'by reducing the insertion force of the elastic leg pieces 2, 2,. That is, in the bush B according to this embodiment, even if the thickness of the elastic leg 2 is relatively large, the elastic deformation of the component 1 ′ protruding from the elastic leg 2 can be achieved. Thus, when the elastic leg piece 2 is inserted into the mounting hole P ′, the elastic leg piece 2 can be bent without hindrance. As a result, in the bush B according to this embodiment, the elastic leg piece 2 is not made thin, but is made relatively thick in consideration of the ease of insertion into the mounting hole P '. As a result, the strength of the elastic leg 2 can be increased, and the elastic leg 2 can be hardly damaged or deformed. 'Can be stably mounted. In this embodiment, the groove 1a is provided on the surface of the head 1 on the side of the bush B where the elastic leg piece 2 does not protrude. The elastic leg piece 2 is located on the surface of the head 1 on the projecting side of the piece 2.
The head 1 is divided into the four components 1 ′, 1 ′,... Along the gaps 4 on both sides of the elastic leg 2, and the components 1 ′ are formed in accordance with the bending of the elastic leg pieces 2. A configuration may be adopted in which the grooves 1a, 1a on both sides of the portion 1 'are elastically deformed. The plurality of grooves 1 a, 1 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, 2 b, and 2 b, 1a... May be provided so as to divide the head 1 into a plurality of components 1 ′, 1 ′. The number, shape, length, and the like of the elastic leg pieces 2 protruding from the head 1 may be changed as needed, and may be divided by the plurality of grooves 1a, 1a,. .. May be provided corresponding to the number of the elastic leg pieces 2. Further, two or more elastic leg pieces 2, 2,... May protrude from one of the constituent parts 1 ′, 1 ′,. The bush B according to the present invention has a structure in which the plurality of elastic legs 2, 2 are attached to the mounting holes P 'of the second member.
Are bent into the insertion holes 3 by bringing the engaging projections 2a into contact with the hole walls of the mounting holes P '. After being inserted through the mounting hole P ′, the engagement protrusion 2 a is inserted through the insertion hole 3.
Is elastically restored at the position where
a and the head 1, the hole edge of the mounting hole P ′ can be sandwiched, fastened to the mounting hole P ′, and mounted.
The attachment to the attachment hole P 'can be performed one-touch and smoothly. The bush B according to the present invention is provided with the groove 1a in accordance with the insertion of the plurality of elastic leg pieces 2, 2,... From the tip end into the mounting hole P 'of the second member.
Each of the constituent parts 1 ', 1',.
Are elastically deformed so as to bend toward the projecting side of each of the elastic legs, so that each of the elastic legs 2, 2,... Is easily bent, and the amount of bending is increased. Since the insertion force of the pieces 2, 2,... Can be reduced, the mounting into the mounting hole P ′ can be performed more smoothly. The elastic deformation of each of the constituent parts 1 ', 1',... Can secure a required amount of bending of each of the elastic legs 2, 2,. Even if the thickness of each of the elastic leg pieces 2, 2,... Is increased as much as possible by setting the wall thickness to be relatively large, it does not hinder the insertion and mounting into the mounting hole P ', and Each elastic leg piece 2,
2 are unlikely to be damaged or deformed, and as a result, the mounting state of the bush B in the mounting hole P 'of the second member can be stably secured. In particular, when the bush B is configured to be small, it is required to set the thickness of the elastic legs 2 to be relatively large in order to secure the strength of each of the elastic legs 2. In this case as well, a required amount of bending of each of the elastic leg pieces 2, 2,... Can be secured by the elastic deformation of each of the constituent parts 1 ′, 1 ′. It has a feature that a printed circuit board attached to a chassis or the like of an electronic device in which it is difficult to set large can be used without any trouble in attaching to a chassis or the like in a buffer state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a screw S, a bush B, a panel P, and a mounting rod K. FIG. 2 is a side sectional view showing a mounting hole P ′ of the bush B and the panel P. FIG. 4 is a side sectional view showing an attached state of the panel P using the bush B. FIG. 4 is a side view of the bush B viewed from the X direction in FIG. 8; FIG. 5 is a side view of the bush B viewed from the Y direction in FIG. 6 is a sectional view taken along line ZZ in FIG. 7 FIG. 7 is a plan view of the bush B FIG. 8 is a bottom view of the bush B FIG. 9 is a screw S, a conventional bush 100, a panel P, and a mounting rod K. FIG. 10 is a cross-sectional side view showing a mounting state of a panel P using a conventional bush 100. [Description of References] S Screw B Bush P ′ Mounting Hole K ′ Female Thread 1 Head 1 ′ Component 1a Groove 2 Elastic leg piece 2a Engagement projection 3 Insertion hole

────────────────────────────────────────────────── ─── Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16B 13/00-13/14 F16B 5/00-5/12 F16B 23/00-43/02 F16F 15 / 00-15/36

Claims (1)

(57) [Claim 1] It is provided with an insertion hole for a screw that is screwed into a female screw portion provided in a first member, and is attached to a mounting hole of a second member. A bush for screwing a screw inserted into the insertion hole to a female thread portion of a first member and attaching a second member to the first member, wherein the bush includes a head and A plurality of elastic legs protruding along the hole edge of the insertion hole, spaced apart from one side of the head, and the elastic leg has a tip end side of the elastic leg. And an engaging projection projecting from the head toward the head side, and between the engaging projection and the head, a hole edge of a mounting hole of the second member is sandwiched, and the mounting is performed. fastened in the hole, Ri <br/> Oh a configuration to be mounted, moreover, wherein the head portion, the interpolation from the outer peripheral edge of the head portion Hole
Are provided in the center direction of the
With these grooves, the head can be elastically deformed around the groove.
Is divided into a plurality of constituent parts,
The elastic leg piece is provided so as to protrude from a portion thereof, and the engaging projection is provided with a head from the distal end side of the elastic leg piece.
With a sloping surface that splays outward toward the part
Bush and said that you are.