JPH039272Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a structure for preventing twisting of cords.
In particular, the present invention relates to a structure for preventing twisting of cords, which can effectively prevent cord breakage due to twisting of the cord.

[Prior art and its problems]

As is well known, when using power tools at a construction site, etc., it is common to plug them into an outlet. Cords often become twisted or become twisted when used at construction sites, and if the above power tools are used in such conditions over time, the cords may break and become unusable, creating a dangerous situation. There was also the problem that it was accompanied by

This invention was devised in view of the current situation, and its purpose is to effectively and reliably prevent cord breakage that occurs due to cord twisting in power tools, etc. The present invention is intended to provide a cord connector that has a simple configuration and is inexpensive.

[Means for solving problems]

In order to achieve the above object, the twist prevention structure for cords according to this invention includes a casing into which the connecting ends of each cord are inserted, and a casing that is housed in the casing and has a connecting end of each cord. a pair of positive electrode terminal members whose parts are electrically conductively connected; a positive electrode spring which urges each terminal member from both directions to hold opposing conductive surfaces of both terminal members in contact; and a positive electrode spring housed in the casing. , and a pair of negative electrode terminal members to which the connecting ends of each of the cords are electrically connected, and a negative electrode terminal member that is biased from both directions to maintain the opposing conductive surfaces of both terminal members in contact. The device is characterized in that it includes a spring, and a cylindrical member that maintains the positive electrode terminal member and the negative electrode terminal member in an insulated state.

[Effect]

Therefore, in this invention, in order to prevent excessive twisting acting on the cord, the positive terminal member and the negative terminal member housed in the casing are freely rotated individually in the direction in which the torsional force is applied. The invention is characterized in that it is configured to allow

〔Example〕

This invention will be described in detail below based on embodiments shown in the accompanying drawings.

FIG. 1 shows a case where this invention is applied to a cord connector, and the cord connector according to this embodiment includes, for example, a power cord 4 that conductively connects a power tool 2 such as a drill and an outlet 3. It is located approximately in the middle of the

As shown in FIG. 2, this cord connector 1 includes a casing 10, a pair of positive terminal members 20, 20', a negative terminal member 30, 30', and a pair of positive terminal springs 4.
0,40' and a pair of negative pole springs 5
0,50'.

The casing 10 is formed into a cylindrical shape from a non-conductive material such as plastic, and has openings 11 and 12 formed at both ends thereof. 4
a and 4a are inserted respectively.

Of course, this casing 10 can be divided into two parts vertically or horizontally and can be assembled integrally with bolts and nuts.Also, the casing 10 can be formed into a cylindrical shape as a whole. However, it can also be configured into a rectangular cylindrical shape or other shapes.

As shown in FIG. 2, slip-off prevention members 13, 13 made of synthetic resin or the like are fixed to the connection ends 4a, 4a of the cord 4 in the shape of a thread-wound drum. , 13 collar 13
a, 13a are the openings 11 of the casing 10,
It is rotatably held via protrusions 11a and 12a formed on the 12 side. Therefore, the slip-off prevention members 13, 13 are mounted such that the movement of the casing 10 in the front-rear direction (horizontal direction in FIG. 2) is restricted, and they are rotatable in the rotational direction.

A pair of positive electrode terminal members 20, 20' are rotatably housed in the casing 10, and
The pair of negative electrode terminal members 30, 30' are rotatably housed within the holding holes 21, 21' formed in the pair of positive electrode terminal members 20, 20', and act as a so-called energizing brush. The positive electrode terminal members 20, 20' and the negative electrode terminal members 30, 30' are each made of a highly conductive material, such as a carbon material.

The positive electrode terminal member 20 configured in this way,
20' and the negative electrode terminal members 30, 30' are insulated by a cylindrical member 22 with high electrical insulation properties fitted into the holding holes 21, 21'.

That is, this cylindrical member 22 has a length in the longitudinal direction that is more than twice as long as each terminal member 20, 20' and 30, 30', and has a shape shown in FIGS. 2 and 3 at both ends. As shown, the collar pieces 23, 23 are provided in a protruding manner.

Incidentally, the reference numeral 24 in FIG. 3 indicates the collar pieces 23, 2
3, the positive electrode terminal cord extraction piece 24 is inserted into the positive electrode terminal hole 23a, and the terminal side end of the positive electrode terminal cord extraction piece 24 is connected to each positive electrode terminal member 2.
0,20', and at the outer end,
As shown in Fig. 3, a cylindrical connector 3 is provided at the tip.
The connecting terminals 36, 36' formed by connecting the terminals 5, 35' are removably fitted, and the connecting terminals 36, 36', the positive electrode terminal cord extraction piece 24, and the positive electrode terminal members 20, 20' are in a conductive state. A conductive connection is made to hold the

Further, a conductive connecting member 26 having a substantially cross-shaped cross section is housed at both ends of the cylindrical member 22, and a terminal-side projecting piece 27 of the conductive connecting member 26 is embedded in the negative electrode terminal members 30, 30'. In addition, as shown in FIG. 3, the outer protruding piece 28 has a connecting terminal 38, which is formed by connecting cylindrical connectors 37, 37' at the tip.
38' are removably fitted, and the connection terminals 38, 3
8', the conductive connection member 26, and the negative electrode terminal member 3
0 and 30' are conductively connected to maintain a conductive state.

The negative electrode terminal members 30, 30' are housed on the inner circumferential side of the cylinder member 22 configured in this way.
Further, the pair of positive electrode terminal members 20, 20' are held between the collar pieces 23, 23 on the outer peripheral side.

Therefore, the positive terminal members 20, 20' and the negative terminal members 30, 30' are attached to the cylindrical member 22 so as to be able to rotate independently, respectively, and are attached to the springs 40, 40' to be described later. Therefore, the opposing surfaces of the positive electrode terminal members 20, 20' are arranged so as to maintain a contact state under normal conditions.

That is, the springs 40, 40' are housed in the casing 10, and the positive electrode terminal member 2
The protrusions 11a, 12a are biased so as to bias the opposing surfaces 0, 20' in the direction in which the opposing surfaces are in contact with each other in the normal state.
and the positive electrode terminal members 20, 20'.

On the other hand, as is clear from FIG. 2, one end of the springs 50, 50', which bias the opposite surfaces of the negative electrode terminal members 30, 30' in the direction of contact in a normal state, is resilient against the conductive connecting member 26. contact,
The other end is the collar portion 13a of the falling-off prevention member 13,
13a, and the connection terminals 38, 38' are arranged so as to come into elastic contact with the springs 50, 5.
It is wired to pass through 0'.

These springs 40, 40' and 50, 5
0' is preferably made of a non-conductive material, such as synthetic resin, to prevent short circuits, and
This is also desirable from the perspective of reducing costs.

Note that the springs 50, 50' housed in the cylindrical member 22 have one end thereof, for example, connected to the cylindrical member 22.
It is fixed to a locking piece (not shown) protruding inside,
It is fixed to prevent it from moving unnecessarily.

Therefore, for example, even if twisting force is applied to the cord 4 for some reason, each positive electrode terminal member 2
0, 20' and negative electrode terminal members 30, 30' are
Since they rotate independently, each positive electrode terminal member 20, 20' and negative electrode terminal member 30, 30'
rotates in the same direction as the twisting direction of the cord 4, thereby preventing wire breakage due to twisting of the cord 4. Of course, in this case, the respective positive electrode terminal members 20, 20' and negative electrode terminal members 30, 30' are kept in contact with each other by the biasing forces of the springs 40, 50 at their opposing surfaces.

FIG. 4 shows a case where this invention is applied to a power outlet, and the power outlet 60 according to this embodiment includes a power supply element 61, 61, and a casing 62 to which the power supply element 61, 61 is fixed. A pair of positive electrode terminal members 70, 70' and a negative electrode terminal member 80, 80', a positive electrode spring 90, a negative electrode spring 100, and a pair of positive electrode terminal members 70, 70' and negative electrode terminal members 80, 80' housed in the connector part 63 of this casing 62. , is composed of.

One of the positive terminal members 70 and 70' and the negative terminal members 80 and 80' is fixed to the casing 62, and the other terminal member 70' and 80' is The springs 90 and 100 disposed within the casing 62 are configured such that their opposing surfaces always maintain contact.

That is, the positive electrode spring 90 has a ring-shaped protrusion 64 projecting between the positive electrode terminal member 70' and the connector portion 63 of the casing 62.
The negative electrode spring 100 is disposed between the conductive connecting member 26 and the detachment prevention member 13, and presses the positive electrode terminal member 70' in the direction of the other positive electrode terminal member 70. The other configurations and functions are the same as those of the cord connector, except that the negative electrode terminal member 80' is arranged to press the negative electrode terminal member 80' toward the other negative electrode terminal member 80. Therefore, the same reference numerals as those used for the cord connector are used in the drawings, and detailed explanation thereof will be omitted here.

Of course, this invention can be applied to various electrical products having electrical cords.

[Effect of idea]

As explained above, this invention is configured so that the positive and negative terminal members housed in the casing can be freely rotated individually in the direction in which torsional force is applied. It has many excellent effects, such as being able to effectively and reliably prevent cord breakage caused by twisting of the cord, and being simple in structure and being able to be provided at a low price.

[Brief explanation of the drawing]

Fig. 1 is an overall view showing a state in which a cord connector according to a first embodiment of this invention is arranged on a cord of a power tool, Fig. 2 is a vertical cross-sectional view of the cord connector, and Fig. 3 is a cylindrical member. FIG. 4 is a perspective view of a power cord according to a second embodiment of the invention. Explanation of symbols, 1...Cord connector, 4...
Cord, 4a... Connection end of cord, 10... Casing, 11, 12... Opening, 20, 20', 7
0... Positive electrode terminal member, 30, 30', 80...
...Negative electrode terminal member, 40, 40', 90...
Spring for positive pole, 50, 50', 100...
...Spring for negative pole, 60...Power cord.

Claims (1)

[Claims for Utility Model Registration] (1) A casing into which the connecting ends of each cord are inserted, and a pair of positive terminals housed within the casing and to which the connecting ends of each of the cords are conductively connected. a member, a positive electrode spring that biases each terminal member from both directions and holds the opposing conductive surfaces of both terminal members in contact, and a positive electrode spring that is housed in the casing and that connects the connecting end of each cord. A pair of negative electrode terminal members that are conductively connected, a negative electrode spring that biases each terminal member from both directions and holds the opposing conductive surfaces of both terminal members in contact, and the positive electrode terminal member and the negative terminal member. A structure for preventing twisting of cords, comprising a child member and a cylindrical member held in an insulated state. (2) The structure for preventing twisting of cords according to claim 1, wherein the positive pole spring and the negative pole spring are made of synthetic resin. (3) The connection end of the cord is housed in the casing so that it is movable in the rotational direction but cannot be moved in the advancing and retracting direction. A structure for preventing twisting of cords according to either item 1 or 2.