JPH0953860A - Decorative ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the mounting of a decorative ring, equipped with a ring unit mounted on the outer periphery of an operating knob penetrated through a mounting hole formed on a casing concentrically substantially and a skirt unit, having fitting room with respect to the mounting hole, by fitting forcibly into the mounting hole without employing any retaining ring. SOLUTION: Engaging projections 32 are provided on the outer peripheral surface of a skirt unit 31 and a gap T, larger than the thickness of a casing 10, is provided between the engaging projections 32 and the rear surface of an annular unit 30 while the vertical section of respective engaging projections 32 is provided with the shape of a right angle triangle substantially, in which the outside surface is a slanted surface faced downwardly. A skirt unit 31, enclosing the upper part of both sides of the engaging projections 32 and the upper sides of the projections 32, is penetrated through the gap G and a gap W between the projecting end of the engaging projections 32 and the outside surface of the opposite side skirt unit 31 is designed so as to be larger than the diameter of the mounting hole 11 while the whole of the skirt unit 31 is made of a synthetic resin prominent in the property of elastic deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative ring, and more particularly to a decorative ring provided on the outer circumference of an operating knob.

[0002]

2. Description of the Related Art A decorative ring of this type is provided, for example, as shown in FIG. 1, on the outer circumference of an operating knob (20) of a wall-mounted water heater. The decorative ring is fitted in the mounting hole of the casing (10). In this fitted state, it is necessary to secure a rotation allowance for the operation knob (20) which is substantially concentric with the decorative ring. Therefore, as shown in FIG. 2, the skirt protruding from the inner periphery of the ring portion (30). There is a sufficient fitting margin between the part (31) and the mounting hole (11), that is, a movement allowance (mounting margin) of the skirt part with respect to the mounting hole (11) in order to absorb variations in the dimensions of each part. There must be a allowance for movement in the direction along the plane.

For this reason, conventionally, as shown in the same figure, the skirt portion (31) is provided with a plurality of engagement protrusions (32) and (32), and the respective engagement protrusions from the center of the skirt portion (31). Set the distance to the protrusion (32) smaller than the radius of the mounting hole (11),
A structure in which a locking ring (40) is interposed between the back surface of the casing (10) and the engagement protrusion (32) is adopted. By making the locking ring (40) sufficiently larger than the diameter of the mounting hole (11), the decorative ring (30) can be mounted in a retaining state, and the fitting allowance and movement allowance with respect to the mounting hole (11) can be secured. Will be secured.

[0004]

However, in this conventional device, the locking ring (40) is required to mount the decorative ring in the mounting hole (11). If the decoration ring is made of a synthetic resin having sufficient elasticity and the engagement protrusion (32) is enlarged, the locking ring (40) is unnecessary, but the engagement protrusion from the tubular skirt portion (31) is eliminated. In the case of a configuration in which the (32) is only significantly projected, the distance from the center of the skirt portion (31) to each engaging projection (32) and the radius of the mounting hole (11) are considered, considering the elastic deformation performance of the synthetic resin. The difference is too large and cannot be installed by force fitting.

The present invention has been made in view of the above point, and is in a state of being substantially concentric with the outer periphery of the operating knob (20) provided so as to penetrate the mounting hole (11) formed in the casing (10). In the decorative ring having a ring portion (30) to be mounted on the skirt and a skirt portion (31) having a fitting allowance for the mounting hole (11), without using the locking ring (40). It is an object of the invention to forcibly fit the mounting hole (11) so that it can be mounted.

[0006]

[Means for Solving the Problems] The solution means of the invention of claim 1 taken to solve the above-mentioned problems is that "a casing is formed between the outer peripheral surface of the skirt portion (31) and the back surface of the ring portion (30). (Ten)
A plurality of engaging protrusions (32) with an interval T larger than the thickness of
(32) is provided, and the vertical cross section of each engaging projection (32) is a substantially right-angled triangle whose outer surface is an inclined surface facing downward.
Skirt (31) in the range surrounding the upper and upper sides of both sides of 2)
Is provided with a gap G penetrating in and out, and the engaging protrusion (32)
The distance W between the projecting end portion and the outer surface of the skirt portion (31) on the opposite side is made larger than the diameter of the mounting hole (11), and the whole is made of a synthetic resin excellent in elastic deformability ”. That is.

In this case, the skirt portion (3
When 1) is forcibly inserted into the mounting hole (11), the engaging protrusion (32)
While the elastic deformation of the (32) occurs, the engaging projections (32) (32) are press-fitted so as to be located on the back surface of the casing (10). At this time, since the engaging projections (32) are substantially right-angled triangular with the outer surface being an inclined surface facing downward, the engaging projections (32) are engaged as they are press-fitted into the mounting holes (11). The fitting protrusion (32) elastically deforms so as to enter the inside of the skirt portion (31). Moreover, since the engaging protrusions (32) are connected to the skirt portion (31) only at the lower side portions on both sides, the deformability of the engaging protrusions (32) is excellent. Therefore, the press-fitting is possible even when the degree of protrusion of the engagement protrusion (32) from the skirt portion (31) is large.

The distance W between the projecting end of the engaging projection (32) and the outer surface of the skirt (31) on the opposite side is determined by the mounting hole (11).
Since it is larger than the diameter of the casing, there is no concern that it will come off from the casing (10) after the decorative ring (30) is press-fitted. A polyamide resin or a polybutylene terephthalate resin can be used as the material of the decorative ring (30).

[0009]

EFFECT OF THE INVENTION Since the decorative ring can be attached to the mounting hole (11) in a retaining state without using the locking ring (40) as in the conventional case, the cost for the decorative ring and the attachment thereof can be reduced. Less. Even if the protrusion degree of the engaging protrusions (32) (32) is large, the attachment to the mounting hole (11) is easy.

Even with a decorative ring which is forcibly press-fitted into the mounting hole (11), it is possible to prevent the decorative ring from being partially damaged during the press-fitting.

[0011]

Embodiments of the present invention described above will be described in detail below with reference to the drawings. The embodiment shown in FIGS.
The decorative ring is implemented as a decorative ring for the operation knob (20) of the water heater shown in FIG. As shown in FIG. 3, the casing (10) of the water heater has a front surface formed in an arcuate cross section, and a mounting hole (11) is formed at a position deviated to the right from the center of the arcuate cross section. .

As shown in FIG. 8, the operating knob (20) mounted on the operating shaft projecting from the internal device has the mounting hole (1).
Penetrate 1). A decorative ring is attached to the mounting hole (11). The diameters of these decorative rings are determined so that a predetermined gap is formed between the inner circumference of the ring portion (30) and the outer circumference of the operation knob (20).

The ring portion (30) is an annular body having a constant width, and the skirt portion (31) projects downward from the inner circumference thereof. On the outer peripheral surface of the skirt (31), as shown in FIG.
2) (32) project at equal intervals. As shown in FIG. 4, each of the engaging protrusions (32) has a right-angled triangular cross section, and its outer surface is an inclined surface facing downward. Also, as shown in FIG.
The flat surface of the engaging projection (32) has a triangular shape facing outward. The distance T between the substantially horizontal upper surface of the engaging projection (32) and the lower surface of the ring portion (30) is slightly larger than the plate thickness of the casing (10).

The front shape of the engaging projection (32) is generally set to a substantially rectangular shape as shown in FIG. 6, and the rectangular engaging projection (32) is connected only at the lower side of its side. Division (33)
It is connected to the skirt portion (31) through. In other words, an inverted U-shaped gap G is formed so as to surround the upper sides of both sides of the engaging protrusion (32) and the upper side of the engaging protrusion (32).

Therefore, when an external force is applied to the engaging protrusion (32) such that the upper portion of the engaging protrusion (32) is pushed into the skirt portion (31), the lower portion of the engaging protrusion (32) and the skirt portion (31) are The entire engaging projection (32) bends inwardly with the elastic return capability around the connecting portion (33). Since the length of the skirt portion (31) is short at the portion where the engagement protrusion (32) does not exist, the above-mentioned effect (flexibility) is further improved.

The decoration ring is entirely made of polyamide resin or polybutylene terephthalate resin, and the engaging projections (32) are easily elastically deformed in the radial direction with respect to the skirt portion (31). Also, the skirt part of this example
As shown in FIG. 4, the inner circumference of the (31) is a tapered surface that expands downward.

The distance W between the tip of the engaging projection (32) and the outer surface of the skirt portion (31) on the opposite side is set to be larger than the diameter of the mounting hole (11). The protrusion degree of each engagement protrusion (32) is determined so as to satisfy this condition. The above decorative ring is mounted in a mounting hole (11) formed at a position deviated from the center of the front surface of the casing (10) as shown in FIG.

At this time, the skirt portion (31) has the casing (1
It is press-fitted from the front side of the casing (10) so as to be located on the back side of (0). The lower end of the engaging projection (32) substantially coincides with the outer peripheral edge of the lower end of the skirt portion (31), and the diameter of the skirt portion (31) is significantly smaller than that of the mounting hole (11). Therefore, at the time of press-fitting, the lower ends of the engaging protrusions (32) (32) are smoothly and easily inserted into the mounting holes (11), and the engaging protrusions (32) are pushed as the skirt portion (31) is pushed. The outer side surface comes into contact with the peripheral edge of the mounting hole (11) and is elastically deformed so that the upper end portion enters the inside of the skirt portion (31).

Finally, with the upper end of the engaging projection (32) positioned on the rear surface side of the casing (10), it is elastically restored and mounted in a retaining state. In this mounted state, the decorative ring is slightly inclined with respect to the operation knob (20) in the vertical state, but the inner peripheral surface of the skirt portion (31) is a tapered surface that expands downward. Therefore, the inner peripheral surface does not come into contact with the operation knob (20). Further, regardless of the mounting position of the decorative ring on the front surface of the operation knob (20), contact with the operation knob (20) does not occur, and the outer peripheral gap of the operation knob (20) is uniform. Become. In other words, even if the decorative ring changes its posture in the rotation direction with respect to the mounting hole (11), the outer peripheral gap becomes substantially constant.

[Brief description of drawings]

FIG. 1 is an explanatory view of a usage example of a decorative ring of the present invention.

FIG. 2 is an explanatory view of a main part of a conventional example.

FIG. 3 is a partially cutaway explanatory view of the casing (10)

[Figure 4] Cross-section of the decorative ring

[Figure 5] Bottom view of the decorative ring

FIG. 6 is an enlarged front view of the engagement protrusion (32).

[Figure 7] Enlarged view of part A of the decorative ring

FIG. 8 is an explanatory view of a state where the casing (10) is attached.

[Explanation of symbols]

 (10) Casing (11) Mounting hole (20) Control knob (31) Skirt (30) Decorative ring T space (32) Engagement protrusion G Gap W space

Claims (4)

[Claims] 1. A mounting hole (11) formed in a casing (10).
A ring portion (30) mounted on the outer circumference of an operation knob (20) provided so as to penetrate through the ring and the mounting hole (1).
In the decorative ring provided with the skirt portion (31) having a fitting margin with respect to 1), the outer peripheral surface of the skirt portion (31) is provided with the casing (10) between the back surface of the ring portion (30). A plurality of engaging protrusions (32) (32) are provided with a space T larger than the thickness,
The vertical cross section of each engaging protrusion (32) is a substantially right-angled triangle whose outer surface is an inclined surface facing downward, and the skirt portion (31) in the range surrounding the upper side and upper side of both sides of this engaging protrusion (32). Is provided with a gap G penetrating inward and outward, and a gap W between the protruding end of the engaging protrusion (32) and the outer surface of the skirt (31) on the opposite side.
A decorative ring made of synthetic resin with a larger elastic deformation than the diameter of the mounting hole (11). 2. The decorative ring according to claim 1, wherein the engaging projection (32) has a triangular shape in a plan view which tapers toward the tip. 3. The decorative ring according to claim 1, wherein the whole is molded with a polyamide resin or a polybutylene terephthalate resin. 4. The decorative ring according to claim 1, wherein an inner peripheral surface of the skirt portion (31) is a tapered surface which expands downward.