JPH0743557U - Board spacer - Google Patents

Abstract

(57) [Abstract] [Purpose] To increase the fitting force between the bush and the collar for fitting the boards together to hold the board therebetween, and at the same time, to facilitate the attachment / detachment work. [Structure] A cylindrical collar 2 and a bush 3 that is axially fitted to the collar 2 and holds a board 4 therebetween. The bush 3 has an insertion portion 32 that is inserted into the collar 2.
Radial projections 33 are provided at a plurality of positions on the circumference of, and the projections 33 are fitted into the annular projections 22 on the inner surface of the collar 2 to fit them together. An axial slit 34, which is closed at both ends, is formed in the insertion portion 32 of the bush 3 at a position sandwiching the protrusion 33 in the circumferential direction, and imparts radial elasticity to the protrusion 33. Since both ends of the slit 34 are closed, the elastic force of the protrusion is suppressed, making it difficult for the bush to come off, while enabling its attachment / detachment.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a board spacer used when holding boards (circuit boards) in a device with a required space.

[0002]

[Prior art]

 Conventionally, a spacer shown in FIG. 7 has been proposed as a spacer for holding boards at a required interval in a device. This spacer is composed of a cylindrical collar 100 and a cylindrical bush 200 that is fitted in the collar 100 in the axial direction and has substantially the same diameter. A small-diameter insert provided on the tip side of the bush 200. By inserting the part 201 into the cylinder of the collar 100 and fitting them, the two are integrated in the axial direction, and the board is sandwiched between the two. When the board is held in the device using this spacer, for example, as shown in FIG. 8, a hole 301 through which the bush can be inserted is made in the board 300, and the insertion portion of the bush 200 is inserted into the hole 301. The board 300 is sandwiched between the bush 200 and the collar 100 by inserting 201 and fitting it to the collar 100. Then, the temporarily assembled structure is placed on the device chassis 400, and then the bolt 500 is inserted from above and screwed into an embedded nut (not shown) of the device chassis 400. It is possible to hold the board 300 at an interval of the length of the collar 100 with respect to the chassis 400.

In this spacer, since the collar 100 and the bush 200 are fitted to each other, the collar 100 is provided with an annular ridge 101 having a small inner diameter on the inner surface of one end thereof, and the collar 100 is inserted into the bush 200 on one side. At a plurality of locations in the circumferential direction of the portion 201, a semi-cylindrical projection 202 that is fitted in the projection 101 in the radial direction is provided. Then, in order to provide the radial elasticity required when the projection 202 is fitted with the projection 101, the insertion portion 201 is cut between the projections 202 from the tip of the insertion portion 201. The slit 203 formed in the axial direction is formed.

[0004]

[Problems to be solved by the device]

 However, in this bush structure, the slit 203 imparts radial elasticity to the protrusion 202. However, if the length of the slit 203 is increased so as to facilitate the fitting of the two, conversely, the both of them will be opposite. The fitting force is reduced so that the projection 202 easily gets over the projection 101, and the fitting between the projection 202 and the projection 101 is easily released when an external force is applied to the bush 200. . Therefore, when an external force is applied to the bush or the like in the state where the collar 300 and the bush 200 form the board 300 as a temporary structure as described above, the bush 200 is easily dropped and the board 300 is not held. It may be damaged and the board may be damaged.

In order to avoid this, if the length of the slit 203 provided in the bush 200 is shortened or eliminated, the elasticity of the protrusion 202 becomes extremely small and the bush 200 is fitted to the collar 100. The work of fitting the bushes 200 becomes difficult, and once fitted, it becomes difficult to separate the bush 200 from the collar 100 at the time of maintenance or the like, and the workability deteriorates. In particular, since the conventional protrusions 202 are formed in a semi-cylindrical shape, the protrusions 102 are less likely to be caught, so that the elastic force of the protrusions 202 is often set to a large value, which makes attachment and detachment difficult. An object of the present invention is to provide a board spacer that can be easily attached and detached while increasing the fitting force between the bush and the collar.

[0006]

[Means for Solving the Problems]

 According to the present invention, an axial slit whose both ends are closed is formed at a position where the protrusion is circumferentially sandwiched in an insertion portion of a bush provided with a protrusion that is inserted into the collar and fitted to the collar. . Further, according to the present invention, in the insertion portion of the bush in which the protrusion is formed, the thickness of the circumferential portion where the protrusion is formed is made thinner than the other circumferential portions.

[0007]

[Action]

 Since both ends of the slit are closed, the elastic force at the protrusion is small, and the bush attaching / detaching force is not so large, but the bush is prevented from coming off due to an external force. Also, by reducing the wall thickness of the insertion part of the part where the protrusion is provided, a not so large elastic force can be applied to the protrusion, and the attaching / detaching force of the bush is not so large, but the bush is Disengagement due to external force is suppressed.

[0008]

【Example】

 Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall construction of the first embodiment of the present invention, and FIG. 2 is a sectional view thereof. A board spacer 1 is a cylindrical collar 2 as in the conventional case, and a collar 2 for this collar 2. The bush 3 is fitted in the axial direction. The collar 2 has substantially the same structure as the conventional one, but in this embodiment, a small-diameter sleeve 21 along the inner peripheral surface of the collar 2 is axially protruded from one end of the collar 2 so as to be described later. By inserting the sleeve 21 into the hole of the board, the hole of the board and the collar can be held concentrically. Further, the annular projection 22 provided at one end of the collar is formed in a taper shape such that the base end surface 22a thereof forms an angle of 30 degrees with the surface perpendicular to the axis.

The bush 3 has a large-diameter portion 31 having substantially the same diameter as the collar 2, and a small-diameter insertion portion 32 which is formed adjacent to the large-diameter portion 31 in the axial direction and can be inserted into the collar 2. In addition, radial projections 33 are formed at a plurality of positions on the circumference of the insertion portion 32, in this embodiment at two positions on the circumference. A pair of slits 34 are formed in the insertion portions on both sides of the protrusion 33 so as to sandwich the protrusion 33 in the circumferential direction. In this case, the slit 34 is not formed up to the edge of the insertion portion 32, and both ends thereof are closed. The tip 33a and the base end face of the protrusion 33 are formed in a taper shape, and in particular, in the base end face 33b, corresponding to the base end face 22a of the protrusion 22 of the collar 2, It is formed so that the taper angle is 30 degrees with respect to the plane perpendicular to the axis. On the other hand, the tip surface 33a is formed with a large angle of 60 degrees or more. Further, in this embodiment, an annular groove 35 is formed on the peripheral surface of the large diameter portion 31 of the bush 3 so that a finger can be hooked when the bush 3 is pulled out.

Therefore, according to the spacer having this structure, the sleeve 21 of the collar 2 is provided in the hole 41 provided in the board 4 as shown in the exploded perspective view and the sectional view at the time of assembly in FIGS. 3 and 4, respectively. The collar 2 can be held concentrically with the hole 41 by being fitted from the lower side. Then, by inserting the insertion portion 32 of the bush 3 into the hole 41 and the collar 2 from the upper side of the board 4, the projecting portion 33 is elastically deformed in the inner diameter direction, and while overcoming the projecting ridge 22, the both are fitted. . As a result, the board 4 is sandwiched between the collar 2 and the large diameter portion 32 of the bush 3 to form a temporary structure.

At this time, the projection 33 is provided with elasticity in the radial direction with respect to the insertion portion 32 by the slits 34 formed on both sides of the projection 33. However, since both ends of the slit 34 are closed, the projection 34 is projected. The amount of elastic deformation of the portion 33 can be suppressed to be small. Therefore, the fitting is easier than that without the slit 34, and a larger fitting force can be obtained as compared with the conventional configuration shown in FIG. 7. In addition, in this embodiment, the base end faces 33b and 22a of the protrusion 33 and the protrusion 22 are formed at 30 degrees with respect to the plane perpendicular to the axis, so that the fitting force between the two is increased and the dropout is prevented. It becomes possible to do. At this angle of 30 degrees, the pulling-out force when the bush 3 is detached from the collar 2 is not particularly large, and the bush 3 can be relatively easily detached.

Therefore, while the force for attaching and detaching the bush 3 to and from the collar 2 is not so great, it is possible to prevent the bush 3 from coming off due to an external force, and it is possible to appropriately hold the board. When fixing this temporary structure to the equipment chassis, as shown in the figure, the bolt 5 is inserted from the bush 3 side and screwed into the nut 8 embedded in the boss 7 of the equipment chassis 6. As a result, the board 4 can be held by the device chassis 6.

FIG. 5 shows a second embodiment of the present invention, and is a view showing a modified example of the bush, in which parts equivalent to those of the first embodiment are designated by the same reference numerals. In the bush 3A of this embodiment, elasticity is imparted to the protrusion 33 provided on the insertion portion 32, and instead of forming the slit, the thickness of the circumferential portion 36 where the protrusion 33 of the insertion portion 32 is formed is changed. It is formed thinner than the other circumferences. By appropriately adjusting the thickness of the portion 36 provided with the protrusion 33, the elastic force in the radial direction of the protrusion 33 can be appropriately set. Therefore, as in the case of the above-described embodiment, the force for attaching / detaching to / from the collar 2 is not so large, but the bush 3 can be effectively prevented from coming off due to an external force. The spacers according to the embodiments of the present invention use a plurality of collars to stack and hold a large number of boards at intervals of the lengths of the collars, for example, as shown in the spacer of the first embodiment in FIG. It is also possible to do so.

[0014]

[Effect of device]

 As described above, according to the present invention, an axial slit whose both ends are closed is formed at a position sandwiching the protrusion in the circumferential direction in the insertion portion of the bush, and the slit provides elasticity to the protrusion. Therefore, it is possible to effectively prevent the bush from coming off due to an external force while preventing the bush from being removed and attached so much, and to prevent damage to the structure temporarily assembled to the board. There is an effect that it is possible to hold various boards. In addition, since the insertion portion of the bush gives elastic force to the protrusion by forming the thickness of the circumferential portion where the protrusion is formed to be thinner than other circumferential portions, The bush can be easily attached and detached while preventing it from coming off.

[Brief description of drawings]

FIG. 1 is a perspective view showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a perspective view showing a state where a board is held by using the spacer of FIG.

FIG. 4 is a cross-sectional view showing a state in which a board is held by using the spacer of FIG.

FIG. 5 is a perspective view of a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing an application example of the spacer of the present invention.

FIG. 7 is a perspective view of a conventional spacer.

FIG. 8 is a cross-sectional view showing a state where a board is held by using a conventional spacer.

[Explanation of symbols]

 1 Board Spacer 2 Color 3 Bush 4 Board 21 Sleeve 22 Protrusion 33 Protrusion 34 Slit

Claims (2)

[Scope of utility model registration request] 1. A cylindrical collar, and a bush that is axially fitted to the collar and holds a board between the collar and the collar. The bush has a small-diameter insertion portion that is inserted into the collar. Is provided, and radial projections are provided at a plurality of positions on the circumference of the insertion portion, and the projections are fitted to the annular projections provided on the inner surface of the collar so that they are fitted together. In the board spacer, an axial slit whose both ends are closed is formed at a position sandwiching the projection in a circumferential direction in an insertion portion where the projection of the bush is formed. 2. A cylindrical collar, and a bush that is axially fitted to the collar and holds a board between the collar and the collar, and the bush has a small-diameter insertion portion that is inserted into the collar. Is provided, and radial projections are provided at a plurality of positions on the circumference of the insertion portion, and the projections are fitted to the annular projections provided on the inner surface of the collar so that they are fitted together. In the board spacer, the insertion portion of the bush in which the protrusion is formed is formed such that the circumferential portion where the protrusion is formed is thinner than the other circumferential portions.