JPS6336944Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a structure for locking the lid of a terminal box, and is capable of reliably locking the lid to a box inside which a terminal screw is installed.

The terminal box is equipped with a box with terminal screws installed therein and a lid that closes the top opening of the box, and has engaging claws 3 protruding from the outer wall 2 of the box 1, as shown in FIG. At the same time, a locking hole 6 is provided in the bent wall 5 of the lid body 4,
There is one in which the lid 4 is locked to the box 1 by engaging the engaging claw 3 with the locking hole 6.

However, in this type of terminal box, a gap a may be formed between the outer wall 2 of the box body 1 and the lid body 4 due to deformation, warpage, etc. during molding. In such a case, since the lid 4 can move left and right with respect to the box 1, a screwdriver 8 is inserted through the tool insertion hole 7 of the lid 4 as shown in FIG. When rotating the screw 9, there is a risk that the screwdriver 8 may press the cover body 4 in the left and right directions due to an operational error, which may cause the engagement pawl 3 to accidentally come off from the locking hole 6, which is a safety issue. There were cases where the damage occurred.

Therefore, it would be better to reduce deformation and warpage during molding, but this requires precision in forming design technology, precision in mold design and manufacturing, and materials with low molding shrinkage. The production costs and material costs are high.

The present invention solves the above problems, and its features include a box body with terminal screws installed inside, and a downward direction from the ceiling wall so as to fit externally into a pair of opposing outer walls of the box body. a lid body having a pair of protruding bent walls, engaging claws protruding outwardly on the pair of opposing outer walls of the box body, and engaging claws provided on the pair of bending walls of the lid body; In a terminal box that is provided with a locking hole that engages with the terminal screw, and a tool insertion hole for rotating the terminal screw in the top wall of the lid, the thickness of the outer wall extends from the bent wall of the lid. In addition, the projecting piece is provided on the top wall of the lid body so as to project downwardly so as to leave a space smaller than the dimension from the inner surface of the outer wall to the outer end of the engaging claw.

Hereinafter, the present invention will be explained according to the illustrated embodiment. In FIGS. 3 to 6, 12 is a box made of synthetic resin, which has a bottom wall 13, a pair of left and right outer walls 14, and a center portion in the left and right direction. An intermediate wall 15 is provided. Reference numeral 16 designates a pair of left and right terminal fittings installed between the outer wall 14 and the intermediate wall 15, which are placed over the mounting piece 17 projecting upward from the bottom wall 13 and the rear end of the support piece 18. , is fastened by a set screw 19 that is screwed into the mounting piece 17. A terminal screw 20 is inserted vertically into the terminal fitting 16 and is screwed into a metal holding plate 21 below the terminal fitting 16. The clamping plate 21 has a square plate shape and is fitted between the mounting piece 17 and the support piece 18 and between the outer wall 14 and the intermediate wall 15, and the clamping plate 21 rotates the terminal screw 20. It is designed to slide up and down when operated. Reference numeral 22 denotes engagement claws, which are provided at the upper end of each outer wall 14 in pairs, front and rear, projecting outward.

A lid body 26 includes a top wall 27 and a pair of bent walls 28 projecting downward from both left and right ends of the top wall 27 so as to fit onto the outer wall 14 of the box body 12. Reference numeral 29 denotes locking holes, which are provided in pairs on each bending wall 28 in correspondence with the locking claws 22.
An engaging claw 22 engages with the box body 12 to hold the lid body 26 in a closed state.
A tool insertion hole 30 is provided in the top wall 27 in correspondence with the terminal screw 20. 31 is an arc-shaped protective piece, and the terminal screw 2 is attached to the edge of the tool insertion hole 30 of the top wall 27.
0 and the lid body 26 so as to project downwardly.

Reference numeral 32 denotes a protruding piece protruding downward from both left and right ends of the ceiling wall 27, and the distance A between the protruding piece 32 and the bent wall 28 is as follows:
It is formed to be the same as or slightly larger than the thickness B of the outer wall 14, and smaller than the dimension C from the inner surface of the outer wall 14 to the outer end of the engaging claw 22.

According to the configuration of the above embodiment, when the bent wall 28 of the lid body 4 is fitted onto the outer wall 2 of the box body 12, the engaging claw 22 engages with the locking hole 29, and the outer wall 14
is fitted between the bent wall 28 and the protruding piece 32, and the protruding piece 32 contacts the inner surface of the outer wall 14 of the box body 12, and the bent wall 28 of the lid body 26 and the outer wall 1 of the box body 12
4 is corrected so that it is smaller than the outward protrusion length of the engaging claw 22, so there is no possibility that the engaging claw 22 will accidentally come off from the locking hole 29.

Furthermore, if there is no protective piece 31, when rotating the terminal screw 20 with the screwdriver 8 as shown in FIG. Since the protective piece 31 is provided so as to protrude so as to reduce the gap with the lid body 26, such a fear can be eliminated.

FIG. 9 shows another embodiment, in which a projection piece 3 is used instead of the arc-shaped protection piece 31 on the rear side in the previous embodiment.
2 is protruded downward close to the tool insertion hole 30, the protrusion piece 32 also serves as a protection piece 31, and a cylindrical protection piece 31 is provided inside the protrusion piece 32 to protrude downward. . The other points are the same as those of the previous embodiment, and the same effects are achieved.

In addition, in the above embodiment, the engaging claw 22 is connected to the outer wall 14.
Although the locking hole 29 is provided protruding from the upper end of the bending wall 28 and extends halfway from the upper end of the bending wall 28, instead of this, the locking hole 29 is provided in the bending wall 28 as shown in FIG.
The engaging pawl 22 may be opened from slightly below the upper end, or the engaging pawl 22 may be provided to protrude downward from the upper end of the outer wall 14, as shown in FIG. Furthermore, the lower end portion of the cylindrical projection piece 32 is
It may be formed into a hemispherical shape as shown in the figure, or the lower end of the cylindrical protrusion piece 32 may be inclined outwardly and upwardly as shown in FIGS. 13 and 14. Further, the projection piece 32 may be formed into a prismatic shape as shown in FIGS. 15 and 16.

According to this invention, a protrusion is provided on the top wall of the lid so as to protrude downward from the bent wall of the lid at a distance equal to or greater than the thickness of the outer wall of the box and smaller than the dimension from the inner surface of the outer wall to the outer end of the engagement claw, and this protrusion can correct the gap between the bent wall of the lid and the outer wall of the box so that it is smaller than the outward protrusion length of the engagement claw, so there is no risk of the engagement claw accidentally coming off the locking hole, and therefore it is possible to reliably prevent the lid from coming off and compromising safety when turning the terminal screw, etc. Moreover, the structure is simple, it can be manufactured easily, and it can be provided at low cost, and its practical effects are remarkable.

[Brief explanation of drawings]

FIG. 1 is a front sectional view showing a conventional example, FIG. 2 is an enlarged front sectional view of the same essential parts, FIG. 3 is a front sectional view showing an embodiment of the present invention, and FIG. 4 is a side sectional view. Fig. 5 is a plan view of the box, Fig. 6 is a bottom view of the lid, Fig. 7 is an enlarged front sectional view of the main parts, Fig. 8 is a side sectional view for explaining the operation, and Fig. 9. 10 to 12 are front sectional views showing other embodiments, FIG. 13 is a front sectional view showing another embodiment, and FIG. 14 is a bottom view of the lid body showing another embodiment. FIG. 15 is a front sectional view showing another embodiment, and FIG. 16 is a bottom view of the same. 12... Box body, 14... Outer wall, 20... Terminal screw, 22... Engaging claw, 26... Lid body, 27...
Ceiling wall, 28...Bending wall, 29...Locking hole, 30...
...Tool insertion hole, 32...Protrusion piece.

Claims (1)

[Scope of utility model registration request] A box body having a terminal screw installed therein, and a lid body having a pair of bent walls protruding downward from a top wall so as to fit onto a pair of opposing outer walls of the box body, engaging claws are provided on the pair of outer walls protruding outward, locking holes into which the engaging claws engage are provided on the pair of bent walls of the lid body, and the terminals are provided on the top wall of the lid body. In a terminal box provided with a tool insertion hole for rotating a screw, the dimension is greater than or equal to the thickness of the outer wall from the bent wall of the lid, and smaller than the dimension from the inner surface of the outer wall to the outer end of the engaging claw. A lid locking structure for a terminal box, characterized in that projection pieces are provided downwardly protruding from the top wall of the lid at intervals.