JPS5835386B2 - Fixture - Google Patents

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to a fixture.

More specifically, the invention relates to a spacing fixture used for fixing two plates in parallel at a certain distance.

For example, many types of set parts are installed inside electrical equipment, and these are arranged by drilling holes in a single panel so that they maintain an insulated state and do not come into contact with each other, and the panels are separated at regular intervals. After that, the electrical equipment is placed and fixed on a chassis that constitutes the exterior of the electrical equipment.

Further, in some cases, in order to make the main body of the device compact, a plurality of the above-mentioned panels are stacked at intervals to effectively utilize the space inside the device.

In this case, spacing fixtures are installed between the chassis and the panels and between the panels to maintain a constant parallel spacing.

As for this fixing device, it is known that, for example, a fixing part is provided at both ends of a support shaft having a length that is spaced at a certain interval, and each is inserted into a fixing hole drilled in advance in a chassis or panel and fixed. As for the fixing part, various structures have been developed.

As an example, US Pat. No. 3,777,052 shown in FIG.
There is a fixing device described in the issue.

Although this fixture can be easily attached and detached and is convenient to use,
When a force is applied to the fixture in the direction P parallel to the panel 14, the coupling body 46 tends to fall in the opposite direction to the arm 450 as shown in FIG. A gap X was formed, and if force was still applied, the gap would become even larger, causing the unit to collapse.

In addition, the leg portion 100 at the end of this fixing device still cannot be said to have sufficient performance in terms of pull-out fracture resistance, resistance to bending, and insertion force. The current situation is that there is a demand for the appearance of tools.

The present invention is a fixing device invented to meet these demands, and is a plug-in type fixing device that firmly and stably fixes two plates apart by providing fixing parts with a special structure at both the upper and lower ends of the holding shaft. It is a fixing device, and its gist is that it is an integrally molded plastic fixture that holds two plates at a distance, and consists of a holding shaft with plate fixing parts at the upper and lower ends of the holding shaft. The upper end fixing part includes a flange that supports the plate material from the back surface thereof, a pair of small elastic support wings extending from the outer periphery of the flange part, and a center column that extends upward in the axial direction of the holding shaft and passes through a fixing hole provided in the plate material. It consists of a pair of non-return pieces extending downward from the tip of the middle pillar, and a pair of connecting pieces connecting the tip of the non-return piece and the flange, and the lower end fixing part is connected to the flange of the lower end of the holding shaft. , a large elastic support wing with an arc-shaped side cross section that elastically deforms other plate materials and restrains them from the surface;
A middle pillar that extends downward in the axial direction of the holding shaft and passes through a fixing hole provided in the plate material, a pair of check pieces that extend upward from the tip of the middle pillar, and the tip of the check piece and the root of the large elastic support blade. This fixture consists of a pair of connecting pieces that connect the surrounding area.

EMBODIMENT OF THE INVENTION Hereinafter, the fixture of this invention is demonstrated based on the drawing which shows one Example.

Reference numeral 1 denotes a cylindrical holding shaft which functions to maintain a required distance between two plates, such as a chassis 15 and a panel 14 on which electrical equipment parts are mounted, and has a certain degree of rigidity for this purpose.

Reference numeral 2 denotes a circular collar part provided at the upper end of the holding shaft 1 and integral therewith, which has a larger diameter than the fixing hole 14a of the panel 14, and is adapted to contact and support the back surface of the panel 14. Therefore, it has a slightly thicker structure.

3 is an upper end fixing part connected to the upper end of the holding shaft 1, and its structure is as follows:
A fixing hole 14a extending axially upward from the center of the flange 2
It has an iFV middle pillar 4 inserted into the center pillar 4, and a pair of reverse check pieces 5 in an inverted V-shape that branch and extend downward in the axial direction from the head of the middle pillar 4. The branched lower end comes into contact with the peripheral surface of the fixing hole 14a of the panel 14 when the check piece 5 is inserted into the fixing hole 14a.

Furthermore, a pair of stretchable band-shaped connecting pieces 6, 6a connected between the lower end of each check piece 5 and the upper peripheral edge of the collar part 2;
It consists of a pair of antenna-shaped small elastic support wings 7 and 7a that face obliquely upward from the peripheral wall of the flange 2.

When the check piece 5 is pressed with a finger, its lower end is elastically deformed and compressed, passes through the fixing hole 14a of the panel 14 from below, and after passing through the fixing hole 14a, expands in the width direction as described above. It contacts the surface of the peripheral panel 14 of the fixing hole 14a.

On the other hand, a pair of small elastic support wings 7, 7a are in contact with the back surface of the peripheral edge panel 14 of the fixing hole 14a, so that the panel 1
4 is clamped and fixed together with the lower end of the check piece 5.

Reference numeral 8 denotes a lower end fixing part connected to the lower end of the holding shaft 1, and its structure consists of a circular collar part 9 provided at the lower end of the holding shaft 1 and integrated therewith.
When the holding shaft 1 is connected to the flange 9 and fixed to the chassis 15, the side cross section is shaped like a circular arc that widens toward the end so that the surface can be restrained at both ends 10a and 10b and the holding shaft 1 can be fixed stably. A flexible large elastic support wing 10 that is strip-shaped when viewed from a flat surface, a middle pillar 11 that is inserted into a fixing hole 15a of a chassis 15 that extends downward in the axial direction from this large elastic support wing 10, and this middle pillar. A pair of V-shaped non-return pieces 12 which branch upward in the axial direction from the bottom of the non-return pieces 11 and from both ends of the non-return pieces 12 on the back surface of the large elastic support wing 10 near the root of the middle pillar 11. It consists of a pair of stretchable band-shaped connecting pieces 13, 13a extending from the bottom to the top.

The check piece 12 is elastically deformed and compressed by the finger pressure, and after passing through the fixing hole 15a of the chassis 15,
The peripheral edge of the fixing hole 15a extends in the width direction and contacts the back surface of the chassis 15, while the large elastic support wing 10 contacts the surface thereof,
With this, the chassis 15 is clamped and fixed.

In this state, the connecting piece 13° 138 is configured such that its lower portion lightly touches the inner wall surface of the fixing hole 15a.

Reference numerals 16 and 16a are two grooves provided in a direction perpendicular to the axial direction of the holding shaft 1 at the joint between the flange 9 and the large elastic support wing 10, and between the flange 9 and the large elastic support wing 10. A gap is formed between the large elastic supporting blades 10, thereby further increasing the biasing effect of the large elastic supporting blades 10.

As described above, the fixture of the present invention has a special fixing structure for two plates formed at both ends of the holding shaft.

In other words, since the small elastic support wings extending from the outer periphery of the flange are provided in the upper end fixing part, they are arranged wide and symmetrically (because they are a pair) on the back side of the periphery of the fixing hole of the panel. The stopper maintains a stable posture and maintains restoring force against oppression from any direction.

Therefore, the vertical holding ability of the upper end fixing portion is improved.

In addition, the check piece centered on the center column and a pair of small elastic support wings provide left and right support with the center line as the center line, and the check piece is stably connected to the center column, so the upper end fixed part It is stably and firmly held on the panel, does not wobble, and the upper end fixing part does not come out from the panel, so the pull-out stability is good.

On the other hand, the lower end fixing part is provided with a pair of expandable connecting pieces that connect the check piece and the vicinity of the root of the large elastic support blade, so it is excellent in terms of pull-out fracture resistance, resistance to bending, and fitting force.

These points will be explained in conjunction with the schematic diagram of FIG. 3 in comparison with the fixture described in US Pat. No. 3,777,052.

When a pull-out force Q is applied upward, in the conventional fixture 100 described in U.S. Pat. No. 3,777,052 in FIG. 103, and is destroyed upon deflection (buckling occurs).

When buckling occurs, the elastic force of the large elastic support wing 104 is reduced and the fastener is no longer useful.

On the other hand, in the present invention, because of the connection piece 13.13a, the tip of the check piece 12 is connected together with the large elastic supporting blade 10 at C in FIG.
The check piece 12 does not bend strongly (and does not easily buckle) like the conventional A.

In other words, the present invention has better pull-out fracture resistance than the conventional product.

There is also a large difference in resistance to bending in the lateral direction.

In the conventional fixture, when a force F is applied from the side as shown by the arrow in FIG. 4, the fixture moves using the apex 105 of the check piece as a bending fulcrum.

Therefore, it is easy to bend and tilt. On the other hand, in the present invention, when the force F is applied from the lateral direction as shown in 2, the connection piece 13 resists bending, so the contact point 16 between the large elastic support wing 10 and the holding shaft 1 becomes the bending fulcrum.

Therefore, the distance between the position where the force is applied and the bending fulcrum 16 is extremely close, and the holding shaft 1 does not bend significantly.

Furthermore, there is a large difference in the force required to insert the fixture into the chassis hole.

In the conventional product, in order to prevent buckling, it is necessary to increase the rigidity of the check piece 101, which requires a large fitting force.

Therefore, if a user repeats the work of inserting a large number of pieces, he or she will become tired.

On the other hand, in the present invention, as described above, the connecting piece 13.13a
Therefore, buckling is less likely to occur, and the rigidity of the check piece 12 is not so strong (although it is fine).

Therefore, a small force is sufficient for fitting, and it is not tiring to fit a large number of pieces.

Furthermore, in the present invention, the fixing can be released by simply pressing the protruding part of each fixing part with your fingers, and since it can be manufactured as an integrally molded product made of synthetic resin, the manufacturing cost is also low. Therefore, it is highly usable as an assembly accessory for electrical equipment.

[Brief explanation of drawings]

Figure 1 shows the conventional fixture described in U.S. Pat. No. 3,777,052, A shows a front view, and Figure 2 shows a side view, and Figure 2 shows a case where a force is applied to the fixture from a direction parallel to the panel. 3 shows an example of the present invention, A is a plan view, the opening is a front view, C is a front view showing the state of use, 2 is a bottom view, and FIG. 4 is a fixed A schematic diagram showing the action of the foot part of the tool, where a is a conventional fixture, b is a fixture of the present invention, A and C sides show the state when force Q is applied,
The d side shows the state where it is left still, and the mouth and 2 show the state where force F is applied. 1... Holding shaft, 2... Flange part, 3... Upper end fixing part,
4... Middle pillar, 5... Non-return piece, 6, 6a... Connection piece, 7, 7a... Small elastic support wing, 8... Lower end fixing part, 9... Flange part, 10...Large elastic support wing, 11...
- Middle pillar, 12... Check piece, 13, 13a... Connection piece, 14... Panel, 15... Shear 7°

Claims (1)

[Claims] 1. An integrally molded plastic fixture that holds two plates at a distance, consisting of a holding shaft with plate fixing parts at the upper and lower ends, and the upper end fixing part of the holding shaft holds the plates together. A flange supported from the back surface, a pair of small elastic support wings extending from the outer periphery of the flange, a middle pillar extending upward in the axial direction of the holding shaft and penetrating the fixing hole provided in the plate material, and a part below the tip of the middle pillar. It consists of a pair of non-return pieces that extend toward the end and a pair of connecting pieces that connect the tip of the non-return piece and the flange, and the lower end fixing part elastically deforms the flange of the lower end of the holding shaft and other plate materials. a large elastic support wing with an arcuate side cross section that is restrained from the surface; a middle pillar that extends downward in the axial direction of the holding shaft and passes through a fixing hole provided in the plate; and a middle pillar that extends upward from the tip of the middle pillar. A fixture consisting of a pair of non-return pieces that extend from one side to the other, and a pair of connecting pieces that connect the tip of the non-return piece to the vicinity of the root of a large elastic support blade.