JP3057954U - Breakage terminal screw removal device - Google Patents

Abstract

(57) [Summary] To provide an apparatus capable of removing a broken terminal screw without giving an impact to instruments and without skill. [PROBLEMS] To penetrate upper and lower surfaces 6, 7 of a guide block 5. At least two through holes 8 and 9 are formed with an interval 10 between the broken terminal screw 3 and a normal terminal screw 4 adjacent thereto, and the diameter of one of the through holes 8 on the lower surface side of the guide block. Is formed to a size compatible with the end face of the broken terminal screw, and the diameter of the upper surface thereof is formed to be smaller than the diameter of the broken terminal screw.
And a fixing screw 13 for screwing into the screw hole 12 of the normal terminal screw and fixing the guide block is provided in the through hole.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a removing device for removing a terminal screw for fixing an electric wire to a meter such as a watt-hour meter when the terminal screw is broken.

[0002]

[Prior art]

 Conventionally, as shown in FIGS. 1 and 2, the integrated watt-hour meter is provided with a pair of terminal screws a, a for fixing the electric wire, and inserted under the terminal screw a. The electric wire c is tightened and fixed by the terminal screw a.

[0003]

[Problems to be solved by the invention]

 The integrated watt-hour meter needs to be periodically verified, and each time the terminal screw a is turned to remove the electric wire c, the terminal screw a may be broken during the work. Such an accident also occurs in electric meters other than the integrated watt-hour meter. If the shaft of the broken terminal screw c protrudes from the screw hole and remains, or if the shaft remains inside the screw hole, It breaks in various states such as when the broken surface is uneven and inclined. Since the instruments are generally expensive, it is necessary to repair the broken terminal screws and continue using the instruments, but the repair is done by engraving the broken surface of the broken terminal screw c with a center punch. This is done by making a hole with a hand drill at the location of the mark, and screwing a reverse screw tap or the like into the hole to take out the remaining broken part.

[0004] In such a removal operation, there is a problem that the impact due to the stamp of the center punch is transmitted to instruments and the operation thereof is disturbed, and the stamp of the center punch is difficult to be stamped on a threaded cross section. Drilling straight holes requires considerable experience, and removing them requires time and skill.

An object of the present invention is to provide a device capable of removing a broken terminal screw without giving a shock to instruments and without skill.

[0006]

[Means for Solving the Problems]

 In the present invention, at least two through-holes penetrating the upper and lower surfaces of the guide block are formed with an interval between a broken terminal screw and a normal terminal screw adjacent thereto, and the guide block of the one through-hole is formed. The diameter of the block on the lower surface side is formed to a size compatible with the end face of the broken terminal screw, the diameter of the upper surface is formed to be smaller than the diameter of the broken terminal screw, and the remaining through holes are formed in the normal size. The above object is achieved by forming a diameter suitable for the screw diameter of the terminal screw and providing a fixing screw in the through-hole for screwing into the screw hole of the normal terminal screw to fix the guide block. I did it. It is preferable that the diameter of the upper surface side of the one through hole is formed to a diameter through which a drill blade can be inserted, and a screw hole is formed in the upper surface side of the guide block of the remaining through hole.

[0007]

[Embodiment of the invention]

 The embodiment of the present invention will be described with reference to the drawings. FIG. 5 shows a state in which one of two terminal screws 3 and 4 for fixing the electric wire 2 to the base 15 of the integrated watt hour meter 1 is broken, The apparatus shown in FIGS. 3 and 4 is used to remove one of the broken pieces. The apparatus is provided with at least two through holes 8 and 9 passing through the upper surface 6 and the lower surface 7 of a guide block 5 having high hardness such as steel and having upper and lower surfaces formed as parallel flat surfaces. The space 10 between the holes 8 and 9 was formed so as to be equal to the space between the two terminal screws 3 and 4.

The diameter of one of the through holes 8 on the lower surface 7 side of the guide block 5 is formed to have a size compatible with the end face of the broken terminal screw 3, and the diameter of the upper surface 6 is changed to the diameter of the broken terminal screw 3. It was formed smaller in diameter than the drill blade 11 so that it could be inserted. The remaining through-hole 9 is formed with a diameter suitable for the screw diameter of the normal terminal screw 4 that has not been broken, and is screwed into the screw hole 12 after removing the normal terminal screw 4 inside the through-hole 9. A fixing screw 13 for fixing the guide block 5 is inserted and provided. In order to reduce the deflection of the fixing screw 13 in the through hole 9, a screw hole 14 that meshes with the fixing screw 13 is formed on the upper surface 6 side in the through hole 9, and the shaft diameter of the fixing screw 13 is The diameter of the hole 14 was made substantially equal to the diameter of the prepared hole. The number of the remaining through holes 9 may be two or more in accordance with the number of terminal screws for fixing the electric wire 2. In addition, the terminal screws are not limited to those of the integrated watt-hour meter, but can be applied to broken terminal screws of other instruments.

As shown in FIG. 5, when one of the two terminal screws for fixing the electric power meter's electric wire is broken, the normal terminal screw 4 is removed, and the through holes 8, 9 of the guide block 5 are removed. The lower surface 7 is brought into contact with the base 15 in correspondence with the terminal screws 3 and 4, and is screwed into the screw hole 12 of the normal terminal screw 4 from which the fixing screw 13 has been removed as shown in FIG. Then, the guide block 5 is fixed to the base 15. When the drill bit 11 of the electric drill is inserted into the through hole 8, the center of the drill bit 11 is located substantially at the center of the end face of the broken terminal screw 3. Hole 16 can be formed. Thereafter, the fixing screw 13 is loosened, the guide block 5 is removed, and a tool provided with a reverse screw tap 17 is screwed into the formed hole 16 for removal. Removed and removed.

[0010]

[Effect of the invention]

 As described above, according to the present invention, at least two through-holes are formed through the upper and lower surfaces of the guide block with an interval between the terminal screws, and one of the through-holes is connected to a terminal screw. The screw diameter is smaller than the diameter of the screw, and the drill bit is guided to the center position of the broken terminal screw, and the remaining through hole is screwed into the screw hole of the normal terminal screw to fix the guide block. Since the fixing screw is provided, a hole for removing the reverse screw tapping tool can be formed easily and without applying an impact by applying a drill blade of an electric drill to the center of the broken end face of the broken terminal screw, and forming the guide block. It is possible to remove the broken terminal screw by removing and screwing the tool into the removing hole without requiring skill, and there is an effect that the configuration can be made simple and inexpensive.

[Brief description of the drawings]

FIG. 1 is a front view of a terminal screw of an integrated watt-hour meter.

FIG. 2 is an enlarged sectional view taken along line 2-2 of FIG. 1;

FIG. 3 is a front view showing the embodiment of the present invention.

FIG. 4 is a bottom view of FIG. 3;

FIG. 5 is a side view of a broken terminal screw to which the present invention is applied;

FIG. 6 is a cut-away side view of the device of the present invention in use.

FIG. 7 is a cut-away side view of a state where a broken terminal screw is removed.

[Explanation of symbols]

3 Broken terminal screw, 4 normal terminal screw, 5 guide block, 6 upper surface, 7 lower surface, 8.9 through hole, 1
0 interval, 11 drill blades, 12.14 screw holes, 16
Hole for removal, 17 reverse screw tap,

Claims (2)

[Utility model registration claims] 1. A guide block, wherein at least two through holes penetrating the upper and lower surfaces thereof are formed with an interval between a broken terminal screw and a normal terminal screw adjacent to the broken terminal screw. The diameter of the lower surface side of the guide block is formed to be compatible with the end face of the broken terminal screw, the upper surface side is formed to have a diameter smaller than the diameter of the broken terminal screw, and the remaining through holes are formed in the normal size. A broken terminal formed with a diameter adapted to the diameter of the terminal screw, and provided with a fixing screw which is screwed into the screw hole of the normal terminal screw to fix the guide block in the through hole. Screw removal device. 2. A broken terminal, wherein the diameter of the upper surface of the one through hole is a diameter through which a drill blade can be inserted, and a screw hole is formed in the upper surface of the guide block of the remaining through hole. Screw removal device.