JPH0737342Y2 - Drip-proof structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a drip-proof structure of a housing, and more particularly to a drip-proof structure in which a packing member can be easily attached and detached without slack.

(B) Prior Art Many conventional drip-proof structures as shown in FIGS. 4 to 9 have been provided.

FIG. 4 is an exploded perspective view showing a drip-proof structure in which an O-ring is placed in a square groove provided in a matching portion of the openings of the housing, and FIG. 5 is a cross-section showing a state where the housing of the same structure is laid down. Figures and 6 show the O of the housing
FIG. 7 is a cross-sectional view showing a state in which the width of the ring square groove is reduced and the O-ring is press-fitted. FIG. 7 is a perspective view showing a state in which the O-ring sags when the O-ring is press-fitted into the same square groove. 9A and 9B are exploded perspective views showing a state in which the slack portion of the O-ring is removed in the structure, and FIG. 9A and FIG. 9B show the state of the joint between the O-rings immediately after press-fitting the O-ring and after a certain period of time It is a perspective view shown.

In the figure, 11 is a housing, 12 is a fitting portion between an opening of the housing and a lid (not shown), 12a is a wide square groove on which an O-ring is mounted, and 12b is the width of the square groove. A square groove slightly smaller than (thickness) 13 is an O-ring which is a packing member. X is the slack of the O-ring, Y is the joint of the O-ring,
Z indicates the length at which the joint of the O-ring is opened.

In the conventional drip-proof structure, as shown in FIGS. 4 and 5, a wide and shallow square groove 12a is provided in the mating portion 12 of the lid and the opening of the housing 11, and the O-ring 13 is formed in the square groove 12a. The O-ring was crushed to obtain a drip-proofing effect by placing on the plate, pressing the cover and pressing. Further, as shown in FIG. 6, when the width of the square groove 12b for the O-ring 13 is made slightly smaller than the diameter of the O-ring 13, and the O-ring 13 is press-fitted into the square groove 12b to lay the housing sideways, I was trying to prevent the O-ring 12b from falling off.

Furthermore, when the O-ring 13 is press-fitted into the square groove 12b, the O-ring 13
In order to prevent the slack from extending and sagging at the end, the slack was removed by cutting off the slack for the drip length to obtain a drip-proof effect.

(C) Problems to be Solved by the Invention However, the above-described conventional drip-proof structure has a problem that the one having the wide O-ring angular groove falls off when the housing is laid sideways.

Further, in the case where the width of the square groove is slightly smaller than the diameter of the O-ring, there is a problem that when the O-ring is pressed into the square groove, the O-ring expands and finally sags, which is not good.

In addition, when the O-ring is cut by a slack length, there is a problem that the extended O-ring contracts and the joint is opened after a certain period of time.

The present invention has been made in view of the above points, and an object of the present invention is to solve the drawbacks of the conventional example and provide a drip-proof structure in which a packing member can be easily mounted and does not sag or drop. It is in.

(C) Means for Solving the Problem In the drip-proof structure of the present invention, a plurality of discontinuous projections are formed in the opening of the housing that fits with the lid so as to serve as a guide for the packing member. In a drip-proof structure that uses an annular packing member or the like that is mounted by engaging the convex portion and the outer circumference, a shape in which a continuous convex portion is provided around the upper surface of a substantially plate-shaped section that is mounted on the mating portion of this housing. Of the packing member and a plurality of holes formed in the packing member so as to face and engage with the discontinuous convex portion are configured to prevent water droplets from entering, and also to enter the opening. A rib is provided on at least a part of the inner peripheral portion of the packing member to prevent slack.

(E) Function According to the present invention, the holes of the packing member are made to protrude from each other by engaging the discontinuous projections of the housing, which are slightly larger than the holes, with the plurality of holes provided in the packing member. The parts are tightly engaged. As a result, the packing member does not fall off even when the housing is placed sideways. Further, since the rib is provided on the main part, the packing member can be mounted on the mating part of the housing without sagging.

(F) Embodiment An embodiment of the drip-proof structure according to the present invention will be described with reference to FIGS. 1 to 3.

The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an exploded perspective view showing a drip-proof structure of the present invention, FIG. 2 is an exploded perspective view of the structure, and FIG. 3 is an exploded perspective view showing another embodiment of the structure.

In the figure, 1 is a housing, 2 is a mating portion with a lid around an opening of the housing, 2a is a discontinuous convex portion provided for guiding in the mating portion 2, and 2b is a notch portion of a packing member. Convex part,
3 is a packing member provided with a continuous convex portion on a substantially plate-shaped cross section made of an elastic body such as rubber, 3a is a hole for engaging the convex portion 2a, 3b is a notch portion for engaging the convex portion 2b, Reference numeral 3c is, for example, a continuous continuous convex portion provided to the plate-like packing member 3 to complete the sealing effect, 3d is provided for preventing sagging, for example, a longitudinal rib, 4 is a housing, and 5 is a housing. 5a is a box-shaped packing member having a bottom, and the cross section of the peripheral edge of the opening is substantially plate-shaped. Continuous convex part on top of
A packing member having a shape provided with 3c, 6a is a hole for engaging with the convex portion 5a, 6b is a side portion of the packing member 6, and 6c is a bottom portion of the packing member 6.

The drip-proof structure of the present invention, as shown in FIG. 1 and FIG.
A plurality of holes 3a or notches formed in the packing member 3
By engaging the convex portion 2a of the housing 1 provided slightly larger than the hole 3a or the cut portion 3b with the hole 3a, the hole 3a or the cut portion 3b of the packing member 3 becomes the convex portion 2a of the housing 1.
Alternatively, the protrusion 2b is tightly engaged.

Further, the packing member 3 prevents slack by, for example, two opposing ribs 3d provided in the longitudinal direction so as to enter the casing 1. As a result, by covering and pressing the packing member 3 engaged with the mating portion 2 of the housing 1, the continuous convex portion 3c provided on the packing member 3 is crushed and completely sealed.

In another embodiment of the present invention shown in FIG. 3, the packing member 6 is formed into a box shape, is provided with a side portion 6b and a bottom portion 6c, and is provided with a notch portion 3b which engages with the convex portion 5a of the housing 4. Is eliminated, and the structure is such that all the holes are 6a. Also in this case, the mounting of the packing member 6 is the same as that described above, and the drip-proof effect is exactly the same.

The height of each of the discontinuous convex portions 2a, 2b and 5a provided on the mating portions 2 and 5 of the casings 1 and 4 is smaller than the thickness of the plate-like portions of the packing members 3 and 6.

(G) Effect of the Invention According to the drip-proof structure according to the present invention, since the packing member is tightly engaged with the discontinuous convex portion provided in the mating portion of the housing, even if the housing is placed sideways, The packing member has the effect of preventing it from falling off.

Further, since the packing member is provided with the ribs, there is an effect that the work for mounting the packing member on the housing is easy and no slack is generated.

Moreover, it has excellent features such as a simple structure and easy implementation.

[Brief description of drawings]

1 to 3 show an embodiment of the drip-proof structure according to the present invention, FIG. 1 is an exploded perspective view showing the drip-proof structure of the present invention, FIG. 2 is an exploded sectional view of the same structure, and FIG. The drawing is an exploded perspective view showing another embodiment of the same structure. 4 to 9 show a conventional drip-proof structure, and FIG. 4 is an exploded perspective view showing a drip-proof structure in which an O-ring is placed in a square groove provided at a fitting portion of an opening of a housing. FIG. 5 is a cross-sectional view showing a state in which the casing of the same structure is laid down, and FIG. 6 is a cross-sectional view showing a state in which the width of the O-ring angular groove of the casing is reduced and the O-ring is press-fitted, FIG. Is a perspective view showing a state where the O-ring is slackened when the O-ring is press-fitted into the same groove, and FIG. 8 is an exploded perspective view showing a state in which the slack of the O-ring is removed in the same structure.
FIGS. (A) and (B) are perspective views showing the state of joints of the O-rings having the same structure immediately after press-fitting the O-rings and after a certain time has elapsed. Explanation of main symbols 1: Housing, 2: Fitting part 2a: Discontinuous convex part, 2b: Discontinuous convex part 3: Packing member, 3a: Hole 3b: Notched part, 3c: Continuous convex part 3d: Rib, 4: Housing 5: Fitting portion, 5a: Discontinuous convex portion 6: Packing member, 6a: Hole 6b: Side portion, 6c: Bottom portion 11: Housing, 12: Fitting portion 12a: Square groove, 12b: Square groove 13: O-ring, X: O-ring slack Y: O-ring joint Z: O-ring joint open length

Claims (2)

[Scope of utility model registration request] 1. A plurality of discontinuous projections are formed in an opening of a housing that fits with a lid so as to serve as a guide for a packing member.
In a drip-proof structure that uses an annular packing member or the like that is placed by engaging the discontinuous protrusions with the outer circumference, a continuous protrusion is formed on the upper surface of the substantially plate-shaped cross section that is placed on the mating portion of this housing. A drip-proof structure characterized in that a packing member having a circumferential shape and a plurality of holes provided in the packing member so as to face and engage with the discontinuous convex portion are configured to prevent water droplets from entering. . 2. The drip-proof structure according to claim 1, wherein a rib is provided on at least a part of an inner peripheral portion of the packing member so as to enter the opening to prevent slack.