JPS6072111A - Knock-out device such as electric implement - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a knockout device for electrical appliances, etc., and is used to insert a power wire insertion hole, conduit, fastener, or Mounting holes for mounting electrical components such as switches can be formed as necessary.

[Technical background of the invention]

A conventional knockout device of this type has a knockout plate part (2) that forms an insertion hole into which a power wire is inserted in both end plates (1) of a lighting equipment body formed of an iron plate, as shown in Fig. 1 and Fig. 2, for example. ) is a structure in which a circular notch (4) is formed using a punching press, leaving the upper and lower connecting parts (3), and this knockout plate part (2) is made to protrude from the plate surface of the end plate (1). is taken. In addition, the knockout plate part is made into an outer knockout plate part so that a mounting hole for attaching a switch etc. can be formed, and the upper connecting part (5) is left in the outer knockout plate part (2) and a circular shape is formed by pressing. A structure is known in which an inner knockout plate part (7) is formed by the notch (6), and this inner knockout plate part (7) is made to protrude from the plate surface of the outer knockout plate part (2).

[Problems with background technology]

In the conventional structure, the outer knockout plate part (2) of the end plate protrudes from the plate surface of the outer knockout plate part (7), and the inner knockout plate part (7) protrudes from the plate surface of the outer knockout plate part (2). (1) If you accidentally grasp the outer knockout plate (
2) or the inner knockout plate (7), the outer knockout plate (2) or the inner knockout plate (7) is pressed.
) may come off and open, creating an unnecessary hole, and this tendency is particularly noticeable when devices are made thinner in recent years and the end plate (1) is made of a thin plate. Therefore, if you increase the number of connecting parts (31 (5)) of the knockout plate part f2+ +71 or increase the width of the connecting part +3 (5), the knockout plate part +21 +71 will be difficult to come off.
In addition, if a relatively thick iron plate is used, such as in a power distribution board, a large pressing force is required to remove the knockout plate parts +21 +71, and when removing the knockout plate parts +21 +71, it is difficult to pierce them with a screwdriver. There was a risk that the tip would slip and damage the surface of the end plate (1) other than the knockout plate +21 (7).
As described in Japanese Patent No. 53056, a structure in which a natural or roughened friction surface is formed on the knockout plate part is known, but even with such a structure, the strength of the connecting part of the knockout plate part is insufficient. Insert a screwdriver or similar tool into the notch in the knockout plate and repeatedly bend it to cut the connection, which may deform the knockout forming board such as the end plate, or in extreme cases, the end plate may break into the main body of the device. It has the disadvantage that it can fall out of place.

Furthermore, in order to form double-sized knockout plate parts, the punching directions for the outer knockout plate part (2) and the inner knockout plate part (7) are different, making it impossible to process them at the same time. The number of connecting parts (3) and the connecting parts (5) of the inner knockout plate part (7) are different, and the punching press die forming the outer knockout plate part (2) has a relief for the inner knockout plate part (7).・It is necessary to form a part, and the press die is severely worn out, and the punching press causes dents in the knockout plate parts +21 and +71.
In particular, when a wire insertion hole is formed or a switch pull string insertion hole is formed, there is a risk that the electric wire may be damaged, the draw string may be cut, or even fingers may be injured during handling.

[Purpose of the invention]

The present invention was developed in view of the above-mentioned drawbacks, and the knockout plate part does not come off inadvertently, can be easily removed when the knockout plate part is removed, does not cause damage, and does not come in contact with fingers when handling. In addition, the durability of the punching press mold can be improved by reducing the number of connecting parts of the knockout plate part (and increasing the holding force), and by forming the inner knockout plate part on the outer knockout plate part. To provide a knockout device such as an electric appliance suitable for so-called double knockout that can form knockout holes of different sizes.

[Summary of the invention]

The present invention makes it possible to form a wire insertion hole or a component mounting hole such as a switch in the end plate of a lighting equipment body by knocking out, and the plate surface of the knockout plate portion formed by the knockout is aligned with the board surface of the board portion. It is characterized by being approximately flush with the surface.

In addition, the second invention allows knockout holes of two sizes, large and small, to be easily formed, and an outer knockout plate portion is formed on the knockout forming substrate, and the outer knockout plate portion is approximately concentric with the outer knockout plate portion. An inner knockout plate portion having a diameter smaller than that of the knockout plate portion is formed in the shape of the knockout plate portion, and the plate surface of the outer knockout plate portion and the plate surface of the knockout forming substrate portion are made substantially the same plane. be.

[Embodiments of the invention]

The configuration of an embodiment of the present invention will be described with reference to the drawings, Figures 1-3 to 6.

(II is a lighting fixture main body with lamp sockets (111 attached to both ends), and a knockout device (131 is formed on the end plate ti2 at both ends of this main body σ0). The α groove is formed by the notch (16) leaving the upper and lower connecting parts (151), and the plate surface of this outer knockout plate part I is protruded inward with a step (a) from the plate surface of the end plate (1z). Using this outer knockout plate circle as a knockout forming substrate, a cut (1a) is made in a diameter smaller than that of this outer knockout plate (141) and approximately concentrically with the outer knockout plate (141), leaving the upper connecting part αη. Knockout plate (
19 is formed, and the plate surface of the inner knockout plate portion (tS) and the plate surface of the outer knockout plate portion (141) are formed on substantially the same plane.

This knockout device (13) has an inner knockout plate part (
One is formed by a punching press, and the inner knockout plate part 09 protruding from the plate surface of the end plate (I2) is knocked out and returned to form to be approximately flush with the plate surface of the end plate (121), and then the outer knockout plate part ( 141 is formed by a punching press. In this state, the outer knockout plate part (141) is projected inward from the plate surface of the end plate (121 with a step (α)), and the outer knockout plate part (141) and the inner knockout plate part (141
9) is formed approximately on the same plane. By forming in this way, the press die for forming the outer knockout plate part (14) can punch and form the outer knockout plate part (14) without being affected by the inner knockout plate part due to the die structure.

Next, the operation of this embodiment will be explained.

Since the inner knockout plate part (19) is formed on approximately the same plane as the outer knockout plate part, it will not easily come off even if the connecting part surface is pressed at one place during handling, and the outer knockout plate part I will not come off easily even if pressed during handling. Since there are two parts, it will not come off even if you press it with your fingers.

For example, when installing a canopy switch 5 as shown in Figures 1-7 and 8, by hitting it with a screwdriver, the inner knockout plate part α9 will come off from the outer knockout plate part a4, and the knockout hole (201) will be removed. Then, the switch υ is attached to this knockout hole (201).The tensile force of the pull string (221) for operating this switch is applied to the outer knockout plate part -, but the connecting part α9 of the outer knockout plate part I is are formed in two places, upper and lower, and will not come off under a certain range of tensile force when operating the switch (
The connecting portion α9 is also positioned parallel to the tensile force so that it receives less force (the outer knockout plate portion I is held by the end plate α2).

In addition, when removing the outer knockout plate part C141 to form a wire insertion hole or a conduit mounting hole, remove the inner knockout plate part in advance and insert a screwdriver or other tool into the knockout hole [20+] formed in the outer knockout plate part αa. By inserting and repeatedly bending left and right, the connecting part 05) is cut and the outer knockout plate round is removed.

Next, other embodiments will be described as shown in FIGS. 9, 1 and 1'lO.
(2) Form a bead 4) that bulges inward along the notch between (2) and (3).

In this structure, the edge of the notch u8 protrudes and opens, the sticking of the inner knockout plate part is alleviated, and the penetration of the inner knockout plate part σ is facilitated.

In addition, in the above embodiment, a configuration was explained in which the outer knockout plate side was a knockout forming substrate, but the fang 11,
As shown in FIG. 12, a configuration in which the end plate (toward) is a knockout forming substrate will be described.

In this configuration, the plate surface of the end plate and the plate surface of the outer knockout plate part (28) formed by the notch (to) and the connecting part opening are made approximately the same plane, and the cut is made in this outer knockout plate part (28). (
The inner knockout plate part Gll formed by the connecting part (29) and the connecting part (30) is formed so that the screen surfaces are on the same plane, and the end plate C9 and the outer knockout plate part (2& and the inner knockout plate part C311) are formed. Formed approximately on the same plane.

With this configuration, the outer knockout plate portion (28) can also be easily removed.

Furthermore, in the above embodiment, a structure was described in which an outer knockout plate part (support)) and an inner knockout plate part C3]+ were formed, but as shown in Fig. 13 and Fig. I11, one knockout plate part (2B ), and this knockout plate part (28) can also be formed in one connecting part (301) substantially on the same plane as the plate surface of the end plate t251 as the knockout forming board. Although the knockout device formed on the end plate of the main body has been described, the invention is applicable not only to lighting equipment but also to various electrical appliances.

〔Effect of the invention〕

According to the present invention, since the knockout plate portion is formed substantially on the same plane as the plate portion of the knockout forming substrate portion, the knockout plate portion does not come off carelessly, and the knockout forming substrate portion is formed of a thin plate material. The holding force of the knockout plate part is increased, and when removing one part of the knockout plate, it can be easily removed by pressing force with a tool such as a screwdriver, and there is no burr generation, and there is no risk of injury to fingers when handling. This improves safety.

Further, according to the present invention, an outer knockout plate portion is formed on the knockout forming substrate so that the plate surfaces are substantially on the same plane, and an inner knockout plate portion is formed on the outer knockout plate portion to form knockout holes of two types, large and small. Since this is formed, the outer knockout plate part can be easily removed, and the holding force can be increased even if the number of connecting parts of the knockout plate part is reduced.

In addition, when the outer knockout plate part and the inner knockout plate part are formed, by forming both plate surfaces substantially on the same plane, the punching press mold does not require relief of one of the knockout plate parts, and the punch can be easily formed. The durability of the mold can be improved, the outer knockout plate can be easily removed by using the knockout hole from which the inner knockout plate has been removed, and a bead can be formed in the notch of the knockout plate. This allows for smoother removal of the knockout plate.

[Brief explanation of drawings]

Fig. 1 is a front view of the end plate of a lighting fixture forming a conventional knockout device, Fig. 2 is a longitudinal sectional view of the same, and the opposite figure is a perspective view of a lighting fixture forming a knockout device showing an embodiment of the present invention. Fig. 1 is a perspective view of the upper end plate, Fig. 5 is a front view of the upper end plate, Fig. 6 is a vertical sectional view of the above, and Fig. 7 is a perspective view of the lighting fixture with a switch attached. , Fig. 8 is a sectional side view of the same fR as above, Fig. 9 is a front view of an end plate forming a knockout device showing another embodiment, Fig. 10 is a cross-sectional view of the same as above, and Fig. 11 is still another embodiment. A front view of an end plate forming a knockout device showing an example, fang 12 is a sectional view of the same section ■-■, and fang 13 is a front view of an end plate forming a knockout device showing another embodiment, fang il1 The figure is ditto XIV
- It is a sectional view of section XIV. Round: Outer knockout plate part as a knockout forming board, H: Inner knockout plate part, (24): Middle bead,
(291... End plate as a knockout forming substrate, (2
8)...Outer knockout plate part, 311...Inner knockout plate part.

Claims (1)

[Scope of Claims] (1) A knockout device for an electric appliance or the like, characterized in that the plate surface of a knockout plate portion formed on a knockout forming substrate portion is substantially the same as the substrate surface of the substrate portion. (21) The knockout forming board portion is an outer knockout plate portion, and an inner knockout plate portion having a smaller diameter than this outer knockout plate portion is formed on the outer knockout plate portion so as to be substantially flush with the plate surface of the outer knockout plate portion. A knockout device for electrical appliances, etc., as set forth in claim 1. (3) A bead is formed at the notch edge of the knockout plate portion and bulges at the center of the notch edge. A knockout device for an electric appliance or the like according to claim 1 or 2. (4) An outer knockout plate portion is formed on the knockout forming substrate, and the outer knockout plate portion is generally referred to as an outer knockout plate portion. An inner knockout plate portion having a smaller diameter than the outer knockout plate portion is formed concentrically, and the plate surface of the outer knockout plate portion and the plate surface of the knockout forming board are made substantially the same plane. Knockout device for electric appliances, etc. (5) The electric appliance according to claim 1, characterized in that the plate surface of the outer knockout plate portion and the plate surface of the inner knockout plate portion are formed to be substantially the same plane. knockout devices such as.