JPH059151Y2 - - Google Patents

Description

[Detailed description of the invention] There are many designs in which a cantilever-like elastic wing is provided by synthetic resin injection molding, and a lock portion is formed by utilizing the flexibility of the elastic wing. However, since the base of such elastic wings, that is, the internal angle with the substrate on which the cantilever-like elastic wings stand, has a very narrow acute angle, condensation occurs during cooling during injection molding, causing so-called "sink marks" and "sag". It was difficult to maintain accurate interior angles and improve manufacturing quality. The present invention is intended to improve this point, and as stated in the claims of the above-mentioned utility model registration, the above-mentioned problem is solved by providing a slight vertical rib that extends from the bottom of the inner corner to the adjacent inner wall.

Two embodiments will be described below with reference to the drawings. FIGS. 1 and 2 show an elastic locking device in which elastic wings 2 are provided at the tip of a base plate 1 that stands up at right angles in the center of a die-cut hole 7 of a mounting plate 6, and that expand left and right in the shape of an arrowhead. As clearly shown in FIG. 2, the elastic wing 2 has a vertical rib 5 extending from the bottom 3 of the inner corner to the inner wall 4 of the elastic wing.
Have a. The width of this vertical rib 5 is about 1 wear,
It may be about 1/5 to 1/15 of the width of the elastic wing.

Further, the length of the vertical rib may be such that it extends in a diagonal straight line toward the inner wall 4 from the boundary between the bottom 3 and the substrate 1, as shown in FIG.

However, although the end of the vertical rib 5 that engages with the bottom 3 may extend to the wall surface of the substrate 1, the flexibility of the elastic wing 2 deteriorates as the amount of crossing the bottom increases.

Therefore, it is preferable to engage the engaging end of the vertical rib 5 with the wall surface side of the substrate 1 at the bottom 3 of the inner corner so as not to lose the original elasticity of the elastic wing.

Next, a second embodiment will be described based on FIGS. 3 to 6. The molded product of this second embodiment is a housing that is fixed by engaging a projection 8 (clearly shown in FIG. 4) provided on the elastic wing 2 with a locking hole 9 of a mounting plate 6 shown in FIG. 6. . Through hole 1 of this housing
When the mounting plate 6 shown in FIG. 6 is inserted from one side of 0, that is, the right side in FIG. 4 or the side shown in FIG. It is designed to be locked when the inner corner is pressed in the direction of narrowing and the locking hole 9 fits into the stepped portion of the projection 8. Therefore, the elastic wing 2 stands up from the right edge of the outer wall 11 of the housing (see FIG. 4) as clearly shown in FIG. It extends substantially parallel to the outer wall 11 in a cantilevered manner, keeping a distance to leave enough flexibility. That is, the inner wall 4 of the elastic wing and the inner wall of the outer wall 11 are substantially parallel and spaced apart by about 1.5 wear. On the bottom 3 of this spacing, a longitudinal rib 5 of approximately one wear width is provided in the center, approximately at right angles to the inner wall 4 and to the bottom 3.

The reason why the engagement end between the vertical rib 5 and the inner wall 4 of the elastic wing is shorter than the engagement end between the inner wall of the outer wall 11 and the vertical rib 5 is to prevent the flexibility of the elastic wing 2 from deteriorating as much as possible. . Although the above two embodiments were carried out for injection molding of polypropylene, they can also be applied to well-known synthetic resin materials such as nylon. Further, the vertical rib of the first embodiment is provided between the bottom and one inner wall adjacent to the bottom, and the vertical rib of the second embodiment is connected on three sides with the inner wall of the elastic wing, the bottom, and the inner wall of the outer wall 11. Although there are differences in the length, it is necessary to have a vertical rib connected to at least the bottom and one inner wall adjacent to the bottom, and the rib should be selected as appropriate depending on the required flexibility of the elastic wing. That's fine.

In addition, this proposal improves the dimensional accuracy of the synthetic resin molded product, making it easier to downsize, and
On the other hand, it has become possible to have more margin in the dimensional accuracy of the mold.

[Brief description of the drawings]

FIG. 1 is a sectional view of the first embodiment, and is a sectional view taken along the - arrow in FIG. FIG. 2 is a plan view seen from below in FIG. 1. FIG. 3 is a plan view of the second embodiment, FIG. 4 is a sectional view taken from FIG.
The figure is a side view thereof, and FIG. 6 is a plan view of the mounting plate with which the housing of the second embodiment engages. All quoted numbers indicate the following. 1...Substrate, 2...Elastic wing, 3...Bottom, 4...
Inner wall, 5...Vertical rib, 6...Mounting plate, 7...Mold hole, 8...Protrusion, 9...Locking hole, 10...Through hole, 11...Outer wall.

Claims (1)

[Scope of utility model registration request] In a synthetic resin injection molded product having a cantilever-like elastic wing 2 that stands up from a substrate 1 and extends substantially parallel to the substrate at an acute internal angle, the inner corner of the engagement between the elastic wing and the substrate is A synthetic resin injection molded product characterized by having vertical ribs 5 extending from the bottom 3 to the adjacent inner wall 4.