JPS5819364Y2 - Fastener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fastener, particularly an H-rotary fastener for removably attaching a panel of an electronic device or the like to a housing.

Cases that house electronic equipment usually have a removable panel for internal repair, inspection, and the like.

Generally, such panels are removably attached to the housing by one or more pawl-type rotary fasteners.

This type of fastener has a rotatable pawl or stop that engages the curved edge of the housing, holds the curved edge of the housing between the pawl and the panel in a fixed position, and moves 90 degrees to the disengaged position. Once rotated, the curved edges of the housing will be released and the panel can be removed from the housing.

Conventionally, such rotating fasteners have not been designed to stably hold the fasteners in positions where panels are installed or removed.

In accordance with the present invention, a molded plastic rotary fastener removably attaches the panel to the housing.

Such a fastener has a conventional disc-shaped body, the body is formed with a curved edge and a groove, and has a shank extending in the axial direction of the disc-shaped body through an opening in the housing, and has a stop and a clasp. Works as a rotation control unit for tools.

Similarly, it may be attached to a panel by simply fitting into an opening provided in the panel.

The stopper tongue piece and the positioning protrusion protrude radially around the disc and are integrally molded together with the disc.

As the fastener rotates within the opening in the panel, the tongue engages or disengages the edge of the housing to perform a stop function.

The protrusion moves between two deep depressions or holes 90° apart, providing two alternating positions.

It is therefore an object of the present invention to provide an H-swivel fastener for removably attaching a panel to a housing.

Another object of the invention is to provide a rotary fastener that is securely held in a rotated position for the installation or removal of panels.

Yet another object of the present invention is to provide an H-rotary fastener that is simple in structure and inexpensive.

An additional object of the present invention is to provide an H-swivel fastener that is rotatably attached to a panel by fitting into an opening in the panel.

Other objects of the invention will become apparent to those skilled in the art from the following description with reference to the accompanying drawings.

A preferred embodiment is shown in the accompanying drawings, in which like reference numbers represent like elements.

A disc-shaped body 12 including an axially extending shaft portion 14 shown in FIG.
1 shows a fastener 10 having:

The shaft portion 14 has a groove 16 into which a screwdriver or a coin can be inserted to rotate the fastener 10.

Additionally, the shaft 14 has radially extending shoulders or flanges 18 on either side of the groove 16 to serve as a retainer for holding the fastener 10 once in place on the panel 20.

The panel 20 has an aperture 22 whose diameter is slightly larger than the diameter of the shank 14 such that the narrow portion between the body 12 and the collar 18 of the fastener 10 is free to rotate within the aperture 22 .

Naturally, the diameter of the opening 22 is smaller than the outer diameter of the flap 18.

The fastener 10 is fitted into the panel 20 by inserting the shaft 14 into the opening 22 and pressing lightly.

The groove 16 allows the edges 18 on both sides of the shaft portion 14 to form openings 22.
As it passes through, it can bend inward, after which the sides quickly return to their original shape so that the edges 18 hold the fastener 10 in place.

A protrusion (first protrusion) 24 having a detent hemispherical protrusion 26 slightly protruding from the surface of the disc 12 is molded around the disc-shaped body 12 and forms an integral part thereof.

The detent projection 26 has first and second recesses, or two holes 32 and 30, located 90° apart on the panel 20 to secure the fastener 10 in one of two rotational positions. Fastener 1 is inserted into one of the two synchronous positions.
Fix 0.

Holes 30 and 32 may be deep depressions.

When the fastener 10 is rotated to the other position, the detent projection 26 moves in an arc across the surface of the panel 20 until it rides out of the hole 30 or 32 and snaps into the other hole.

An arcuate guide groove 34 may be provided on the inner surface of the panel 20 to limit rotational movement beyond the range between the holes 30 and 32 while preventing the detent projection 26 between the holes 30 and 32.
facilitate movement.

A second protrusion, that is, a tongue piece 36 protruding outwardly for engaging with and disengaging from the curved edge of the housing 28, is connected to the disc-shaped main body 12.
is formed by molding around the opening 22 and is an integral part thereof, acting as a stop when the fastener 10 rotates within the opening 22, as will be explained below.

FIG. 2 is a front view of fastener 10 attached to panel 20 in an unlocked position, with the portion of the fastener on the rear side of the panel represented by dotted lines.

The detent projection 26 is now located within the bore 30 and the radially extending tongue 36 is in an unlocked position behind the bore 32.

FIG. 3 is a front view similar to FIG.
It is in a fixed position behind 0.

FIG. 4 shows this fixation position even more clearly.

When the fastener 10 is rotated 90 degrees clockwise to the locked position, the tongue 36 frictionally engages the curved edge 40 of the housing, sandwiching the curved edge 40 between the tongue 36 and the panel 20.

When the fastener 10 is rotated 90 degrees counterclockwise to the unlocked position, the tongue 36 releases the curved edge 40 and the cover or panel 20 is removed from the housing 28.

In the unlocked position, projection 26 is secured within hole 30, as represented by the dashed line in FIG.

In an embodiment, the invention may be a single fastener on an internal inspection panel, or one of several fasteners on a housing panel of the type commonly found in electronic equipment.

These panels may be either sheet metal or plastic, although panel 20 is shown in the drawings as metal.

Fastener 10 may be of any suitable plastic material and may be formed as a complete integral part using any conventional molding or casting technique.

FIG. 5 shows another embodiment of the present invention.

Here, the fastener 10 is designed to have the desired structural strength while being extremely light in weight and using a minimum amount of material.

Each half of the shaft 14 extends from the cavity of the main body 12, and the longer the length, the greater the elasticity, making it easier to fit into the panel.

The tongue 36 has a sloped surface 46 that readily engages the curved edge of the housing 28 when the fastener 10 is rotated to the locked position.

Although the preferred embodiments of the present invention have been described above, the present invention can be modified and changed in various ways without departing from the gist thereof.

For example, in the embodiment described above, the main body 12 and the shaft portion 14 are integrally molded, but the image portion may be a separate part.

At this time, an opening is provided in the center of the main body, the cylindrical part of the shaft is made longer and a collar-shaped edge is provided at the end, and the shaft is inserted into the opening of the main body through the opening in the panel. The collar-shaped edge of the shaft portion is engaged with the peripheral edge of the opening of the main body.

Alternatively, the end of the shaft may be welded to the peripheral edge of the opening of the main body.

Furthermore, even when the main body and the shaft are integrally molded, instead of providing the collar-like edge 18, after passing the shaft through the opening in the panel, the end of the shaft is crushed with a hammer or the like to form a detent part. may be formed.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the fastener according to the present invention, Fig. 2 is a front view of the fastener according to the present invention fitted to a panel and in an unfixed position, and Fig. 3 is a front view of the fastener according to the invention fitted to a panel and in a fixed position. A front view of a fastener according to the present invention, FIG. 4 is taken along line 4-4 in FIG.
FIG. 5 is a perspective view showing another embodiment of the present invention. In the figure, 10 is a fastener, 12 is a main body, 14 is a shaft, 16 is a groove, 18 is a flap, 20 is a panel, 22 is an opening, 24 is a first protrusion, 26 is a protrusion, 25 is the housing, 3
0 repels the second Li-'1 part, 32 repels the first four parts, and 36 repels the second protrusion.

Claims (1)

[Scope of utility model registration request] In fasteners for removably attaching a panel to a housing,
The fastener includes a panel having an opening and first and second recesses spaced apart on the same circle centered on the opening, a plate-shaped body rotatably attached to the opening of the panel, and a plate-like body rotatably attached to the opening of the panel. A first protruding part and a second protruding part each having a protrusion on the surface are provided to protrude from the outer periphery of the main body, and the protrusion of the first protruding part fits into the first and second four parts. The main body is in stable first and second rotational positions, and in the first rotational position, the second protrusion and the panel sandwich the edge of the casing to attach the panel to the casing, and 2
A fastener characterized in that said panel is removable in the rotated position.