JPH0241884Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a lid mounting device, and more specifically, the invention relates to a lid mounting device, and more specifically, it is mounted on a recess formed in the housing of an electrical measuring instrument, for example, for storing an adjustment knob. The present invention relates to a lid attachment device for detachably attaching a lid.

[Conventional example]

For example, in a signal generator for measurement, etc., adjustment knobs and the like that are used infrequently are placed in a recess formed in the housing, and are usually covered by a lid. In this case, the lid is removably attached to the recess, and an example of a conventional device is shown in FIGS. 6 and 7.

That is, in FIG. 6, 1 is a housing of an electrical measuring instrument, etc., and 2 is a recess having a rectangular opening surface 3 formed at a predetermined portion of the housing 1. Although not shown, this recess Adjustment knobs, slide switches, etc. are arranged inside 2. On the other hand, in FIG. 7, reference numeral 4 denotes a rectangular lid that is detachably attached to the opening surface 3 of the recess 2;
First and second engaging elements 5 and 6 for the recess 2 are formed in the recess 2 . In this conventional example, the first engagement element 5 consists of an engagement piece protruding from one side 4a of the lid 4 so as to engage with an engagement groove 7 formed on the side of the recess 2; The second engaging element 6 is a claw formed on the other side 4b opposite to one side of the lid 4, and an elastically deformable claw receiver 8 is provided on the recess 2 side as an engagement receiving member for the claw 6. It is provided. Note that 9 is a slit for making the pawl receiver 8 elastically deformable. Furthermore, support members 10, 10 for supporting both sides 4c, 4c of the lid 4 are provided on both sides of the recess 2. This support member 10 includes a flat support portion 10a that holds the lid 4 at a height position flush with the wall surface of the housing 1 when the lid 4 is attached to the recess 2, and a flat support portion 10a that holds the lid 4 at a height position flush with the wall surface of the housing 1, and a flat support portion 10a that holds the lid 4 at a height position flush with the wall surface of the housing 1, and a flat support portion 10a that holds the lid 4 at a height position flush with the wall surface of the housing 1. Tapered surface 10b that can be dropped into 2
The intersecting portion of the support portion 10a and the tapered surface 10b acts as a pivot point 10c for the lid 4.

In this conventional example, in order to attach the lid 4, one side 4a side of the lid 4 is placed in a forward downward position, and the engaging pieces 5, 5 are inserted into the engaging grooves 7, 7 on the recess 2 side, and then the lid 4 is attached. The other side 4b of 4 may be pressed to forcibly engage the claw 6 with the claw receiver 8. On the other hand, in order to remove the lid 4, one side 4a of the lid 4 is pressed. As a result, a force is applied to the other side 4b of the lid 4 in the counterclockwise direction shown in FIG. It turns out.

[Problem that the invention attempts to solve]

According to the above-mentioned conventional example, the lid 4 can be attached and detached by simply pressing the lid 4, but the lid 4 is required to have relatively high rigidity. In other words, especially when removing the lid 4 if its rigidity is weak, even if one side 4a of the lid 4 is pressed, the area around the same part will only flex, and the reaction force will not be effectively transmitted to the claw 6 side, and the engagement will be reduced. This is because the combination cannot be dissociated. For this reason, in the past, the thickness of the lid 4 was increased to increase its rigidity.
According to this, it is not desirable in terms of cost, and
Injection molding of synthetic resin has the disadvantage that so-called sink marks are likely to occur and the rate of defects is high.

[Means for solving problems]

In order to solve the above-mentioned conventional drawbacks, this invention provides a lid attachment device that removably attaches a lid of approximately the same shape to a recess having a rectangular opening formed in a housing for electrical measurement, etc. , each of one side of the lid and the other side opposite thereto is provided with first and second engagement elements that releasably engage with an engagement receiving member formed on the recess side, and A supporting means is provided between the remaining two sides of the lid and the recessed portion, and the support means has a support portion that holds the lid at a predetermined height position within the opening surface, and a fulcrum portion that serves as a pivot point for the lid. In this apparatus, an auxiliary support means having a support part and a fulcrum part similar to the support means described above is provided between a substantially central part of the lid and the recess.

[Effect]

As described above, according to this invention, since the auxiliary support member is also provided in the almost central part of the lid, there is almost no risk that the lid will bend due to the pressing force when removing the lid. can be made thinner.

〔Example〕

Hereinafter, embodiments of this invention will be described in detail with reference to FIGS. 1 to 5. In these figures, the same reference numerals are given to parts that are or are considered to be the same as in FIGS. 6 and 7 described above.

In this lid attachment device, as shown in FIGS. 1a and 1b, in addition to supporting members 10 and 10 that support both sides 4c and 4c of the lid 4 on both sides of the recess 2, for example, the recess 2 An auxiliary support member 20 is provided approximately in the center of the support member 20 . This auxiliary support member 20 is a support part 20 similar to the support member 10 described above.
a, a tapered surface 20b, and a pivot point 20c formed at the intersection of these surfaces. In this embodiment, a pair of claws 6, 6 are formed on the other side 4b of the lid 4, and accordingly, a pair of claw receivers 8, 8 are provided on the recess 2 side. and
This makes their engagement stronger.

According to the above configuration, since the center portion of the lid 4 is supported by the auxiliary support member 20, the lid 4
Even if one side 4a is pressed during removal, it will not easily bend, and the engagement between the claw 6 and the claw receiver 8 will be reliably disengaged.

A modification of this invention is shown in FIGS. 4 and 5. That is, in the modified example shown in FIG. 4, a pair of support members 21,
21 and an auxiliary support member 22 are provided,
In this case, each of the supporting members 21 and 22 includes first columnar projections 21a and 22 that support the other side 4b of the lid 4.
a, and second columnar projections 21b and 22b erected at the rotational fulcrum position of the lid 4. That is, according to this modification, when the lid 4 is attached to the opening surface 3 of the recess 2, each of the columnar projections 21a,
22a; 21b, 22b so that it is held flush with the wall surface of the housing 1, and when removed, it can be opened using the corners of the second columnar projections 21b, 22b as pivot points.

On the other hand, in the modification shown in FIG. 5, supporting members 23 and 24 are formed on the back side of the lid 4. That is, a pair of support members 23, 23 corresponding to the above-mentioned support members 10, 10 in FIG. An auxiliary support member 24 corresponding to the auxiliary support member 20 in FIG. 1 is provided. Since each of these supporting members 23 and 24 has the same shape, the supporting member 23 shown in FIG.
a flat support part 23a that contacts the bottom surface of the recess 2 and holds the lid 4 at a predetermined height position, that is, at a height flush with the wall surface of the housing 1; and one side 4a of the lid 4.
Tapered surface 23a that allows the side to fall into the recess 2
and a rotation fulcrum 23c formed at the intersection thereof. Note that instead of this rib-like projection, a support member consisting of the first and second columnar projections explained in FIG. 4 may be formed on the back side of the lid 4.

〔effect〕

As is clear from the description of each example above,
According to this invention, an auxiliary support member is provided on either the recess of the casing or the lid attached to the recess, which supports approximately the center of the lid. Since there is no risk of the central portion being bent, the thickness of the lid can be made as thin as possible, thereby achieving further cost reductions and a reduction in the number of defects during molding.

[Brief explanation of drawings]

Figures 1 to 5 relate to an embodiment of this invention, where Figure 1a is a plan view showing a recessed portion of a housing according to an embodiment, and Figure 1b is a cross section taken along line A-A in Figure 1a. Fig. 2a is a plan view of the lid attached to the recess in Fig. 1a, Fig. 2b is a side view of the lid, and Fig. 3 is a top view of the lid attached to the recess in Fig. 1a.
Sectional view of the combination of Figure b and Figure 2 b, No. 4
Figure a is a plan view similar to Figure 1 a according to a modification of this invention, Figure b is a sectional view taken along line B-B of Figure 1A, and Figure 5
Figure a is a plan view showing a modified example in which the support member is provided on the lid side, Figure b is a side view of the lid according to the modified example, and Figure 6 a is a plan view showing the recessed part of the casing according to the conventional example. , Fig. 7b is a sectional view taken along the line C-C of Fig.
A plan view showing the lid that fits over the recess in the figure, Figure b
is a side view of the lid. In the figure, 1 is the housing, 2 is the recess, 3 is the opening surface, 4 is the lid, 5 is the engagement piece, 6 is the claw, 7 is the engagement groove, 8 is the claw receiver, and 10, 21, 23 are the support members. ,20,22,
24 is an auxiliary support member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A lid attachment device for removably attaching a lid of approximately the same shape to a recess having a rectangular opening formed in a housing for electrical measurement, etc. First and second engagement elements that releasably engage with the engagement receiving member formed on the recess side are provided on each of one side and the other side opposite thereto; A support means is provided between the remaining two sides and the recessed portion, and the support means has a support portion that holds the lid at a predetermined height position within the opening surface, and a fulcrum portion that serves as a pivot point for the lid. A lid attachment device according to the present invention, further comprising an auxiliary support means having a support part and a fulcrum part similar to the support means described above, provided between a substantially central part of the lid and the recessed part. (2) In claim (1) of the utility model registration, the supporting means and the auxiliary supporting means are a lid attachment device provided on the side of the recess. (3) The lid attachment device according to claim (1) of the utility model registration, wherein at least the auxiliary support means of the support means and the auxiliary support means are provided on the lid side.