JPH0247596Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the structure of a lead portion that connects a heating conductor portion of a heating coil facing a member to be heated to an output terminal of a power source transformer.

(Prior art) For many years, the lead portion of a heating coil has been formed by connecting a heating conductor portion to one end of each conductor portion extending in parallel through an insulating plate material, and bending the heating conductor portion outward at right angles to each other at the other ends. The plate-shaped output terminal of the power supply side transformer is provided with a plurality of female screw holes, and the input terminal portion is provided with blank holes at positions corresponding to the female screw holes. , the output terminal and the input terminal portion were brought into contact with each other and bolted together. However, since the heating coil needs to be changed every time a different member is to be heated, it takes time and effort to attach and detach the heating coil by bolting it together, and if the heating coil is attached and detached repeatedly, the female thread of the output terminal and the male thread of the bolt may be damaged. Although it is easy to replace the bolt side with a new one, the transformer output terminal side requires removing the transformer from the power supply and replacing the fixed damaged output terminal with a new one, which takes a lot of time. This required a lot of work and was complicated.

Therefore, recently, as disclosed in Japanese Patent Application Laid-Open No. 58-176893 and Japanese Utility Model Publication No. 56-50714, a heating coil attachment/detachment mechanism using a lever-type clamper using a lever or an eccentric cam has been developed. It can be attached, detached, and replaced with one-touch operation.

(Problems with the prior art) However, the above-mentioned lever type clamper requires at least a frame member for fixing the fulcrum of the lever or the rotating shaft of the eccentric cam due to its structure. For example, a large box-shaped structure, etc., must be installed in the heating coil, which not only requires a large space but also has a complicated shape with protruding levers. There was a desire to develop a one-touch attachment/detachment mechanism.

(Purpose of the invention) The present invention was made to solve the problems of the conventional one-touch detachment mechanism of the lead part when connecting a heating coil to the output terminal of a transformer. The purpose of the present invention is to provide a heating coil lead part that can be automatically centered, has an extremely simple structure, and has a one-touch attachment/detachment function.

(Progress until completion of the invention) In order to solve the problems that existed in the conventional one-touch attachment/detachment mechanism of the lead part, the present inventor first produced a prototype lead part having the configuration shown in FIG. 2.

In the figure, 1 is an output terminal of a power supply transformer L2, 20' is a fixed lead portion, and C' is a heating coil consisting of a connecting lead portion 30' and a heating conductor portion Cc.

The fixed lead portion 20' is formed into a plate shape by bending one end of each of the conductor portions 21', 21' extending parallel to each other through an insulating plate material s at right angles to each other outward, and the output terminal of the transformer L2. 1 to form an input terminal portion 22', and the other end portions are bent at a predetermined interval and parallel to each other into an open leg shape to form output terminal portions 23', 23'. The input terminal portion 22' is provided with a hole Hb' at a position corresponding to a plurality of female screw holes Ha formed in the output terminal 1, and is connected to the output terminal 1 of the constant transformer L2 and the bolt B. Tensioned and fixed.

The connection lead part 30' of the heating coil C' has an extension part 31' extending in parallel through the insulating plate material s,
A heating conductor portion Cc is connected to one end of each of the fixed lead portions 20′, and the thickness of the other end is the output terminal portion 23′, which is the open leg of the fixed lead portion 20′. The input terminal portion 32' is formed to have a width substantially equal to the width of the opposing surface so that it can be inserted between the opposing surfaces 23'.

When the heating coil C' is used, the input terminal part 32' is fitted into the output terminal part 23' of the fixed lead part 20', and a U-shaped clamping member shown as 40' and a bolt shown as 41' are used. , sandwiching member 4
By screwing the bolt 41' into the female screw hole 42' provided on one side of the output terminal part 2
3' and 23' are pressed from both outside directions, and the inner surface of each output terminal portion 23' and the outer surface of the input terminal portion 32' are brought into close contact and abutment to maintain electrical connection.

Prototype lead part 20', 3 with the above connection structure
0' has a simple structure, and can be attached and detached with one touch by tightening one bolt, but it has the disadvantage that it takes time to align vertically when attached.
On the other hand, bolts tend to loosen due to vibration, which may cause misalignment during use or cause damage to the output terminal section 2.
There were problems such as the risk of spark generation due to poor adhesion between the input terminal section 3' and the input terminal section 32', and there was a need for further improvement.

(Structure of the invention) The structure of the invention is as follows: (1) The lead part that connects both ends of the heating conductor part and both output terminals on the power supply side is composed of a fixed lead part, a connecting lead part, and a clamp part; ) Each of the fixed lead parts has one end formed into a pivot terminal part having a structure that can be pivotally connected to both of the power supply side output terminals, and the other end formed into a plate-shaped output terminal part bent outward at a right angle. A convex positioning piece is provided at a predetermined position on the front end surface of the output terminal part, and (3) one end of each of the connection lead parts is connected to the heating conductor part, and the other end is bent outward at right angles to connect to the fixed lead part. (4) Forming a plate-shaped input terminal portion having approximately the same size as the output terminal portion, and providing a fitting portion consisting of a recess or a through hole corresponding to the positioning piece on the front end surface of the input terminal portion, and (4) the above-mentioned The clamp part includes a U-shaped arm whose opening width is at least the sum of the plate thicknesses of the output terminal part and the input terminal part, and one side of the arm is formed at a predetermined position on the back end surface of the output terminal part. The other end is connected to the flange with a pin so that the other end can be displaced outward, and a pressing mechanism is installed on the other side so that the pressing force is directed toward the one side. It is located in the lead part of the heating coil.

(Function of the invention) The present invention has an action that instantly completes centering of the heating coil by simply fitting the positioning piece and the fitting part, and a U-shaped arm that approaches and separates from each other, and one side of the arm. The effect of establishing a strong electrical connection within a short period of time is almost simultaneously exerted by the clamping force generated between the two sides and the other side using the other side as a reaction force receiver.

(Example) The present invention will be described in detail below according to an example shown in FIGS. 1a and 1b.

In the figure, 1 is the output terminal of the power supply side transformer L2, 20 is the fixed lead part, and C is the connecting lead part 30.
and a heating conductor portion Cc, and 40 is a clamp portion.

The fixed lead portion 20 is formed into a plate-shaped pivot terminal portion by bending one end of each of the conductor portions 21, 21 extending in parallel through an insulating plate material s at right angles outward to each other as shown as 22, 22. There is. The external dimensions of the pivot terminal portions 22, 22 are approximately the same as the output terminal 1 of the transformer L2, and there are blank holes Hb at positions corresponding to the plurality of female screw holes Ha provided in the output terminal 1. is provided with a hole, and is permanently connected to output terminal 1 of transformer L2 by bolt B. This is the same as in the case of the trial lead part described above in that it is in a fixed state. However, in the present invention, the other ends of the conductor parts 21, 21 are bent outward at right angles to each other to form plate-shaped output terminal parts 23, 23. A convex positioning piece 24 is provided at a predetermined position on the front end surface of the output terminal portion 23 .

Connection lead portion 30 in the heating coil C
is the extension part 3 extending in parallel via the insulating plate material s.
A heating conductor portion Cc is connected to one end of each of 1 and 31, and the other end is a plate-shaped input terminal bent outward at right angles to each other and made approximately the same size as the output terminal portion 23 of the fixed lead portion 20. It is formed in the portions 32, 32. The input terminal portions 32, 32 have a positioning piece 2 at a position corresponding to the positioning piece 24.
A through hole into which 4 can be fitted is provided to form a fitting part 33.

The clamp part 40 has U-shaped arms 41, 41 whose opening width is at least the sum of the thickness of the output terminal part 23 of the fixed lead part 20 and the thickness of the input terminal part 32 of the connection lead part 30. It is equipped with
One bent side 41a of the arm 41 is connected to the flange 2 formed on the back end surface of the output terminal 23.
5, 25 are combined with pin connection P,
As shown by arrows a-b, the other end is outside.
It is possible to rotate inward. Also,
A screw hole is provided in the other bent side 41b of the arm 41, and the tip of the screw bolt 42 is directed toward the one side 41a.

In addition, if a stopper is provided on the tip end face of the screw bolt 42, as shown as 43 in FIG. 1b,
A relatively soft terminal portion such as a copper material is protected during tightening as described later.

When attaching the heating coil C to the output terminal 1 of the transformer L2 and the fixed lead part 20 that always maintains a tensioned and fixed state, first attach the arm 4 of the clamp part 40.
1 and 41 in the direction a to create a sufficient distance between them, and set the screw bolt 42 in the retracted position. Next, the heating coil C with the connecting lead portion 30 in the front is advanced in the direction of the arrow c, and the positioning piece is moved. 24 into the fitting portion 33, the front end surface of the output terminal section 23 and the front end surface of the input terminal section 32 are brought into contact with each other, and in this state, the arms 41, 41
After displacing the screws in the direction b, the screw bolt 42 is screwed forward. The relevant screw bolt 4
2 uses the other side 41b of the arm 41 as a half-force support to tightly contact and fix the contact between the output terminal section 23 and the input terminal section 32, thereby centering the heating coil C and making a strong electrical connection at the same time. Complete.

Furthermore, during use, the positioning piece 24 is fitted into the through hole 33, so there is no room for movement in the vertical or horizontal directions, so there is no risk of the electrical connection becoming loose.

In order to detach the heating coil C from the fixed lead portion 20, the screw bolt 42 may be loosened and the arm 41 may be displaced in the direction a.

(Other Examples) In the above example, in order to match the shape of the output terminal 1 of the transformer L2, the pivot terminal portion 22 of the fixed lead portion 20 is bent to form a plate shape, and I explained using the case of bolt tightening, but
The shape of the pivot terminal portion 22 and the tensioning means only need to be able to be pivotally connected to the output terminal 1, and if the shape of the output terminal 1 is different, the design of the shape of the pivot terminal portion 22 and the tensioning means may be changed accordingly. Of course it's a good thing.

Further, in the above embodiment, the positioning piece 24 provided on the output terminal portion 23 is fitted into the fitting portion 33 consisting of a through hole provided on the input terminal portion 32, but the fitting is not limited to this. Part 33
It is also possible to form a recess formed in the input terminal portion 32.

Further, in the above embodiment, the screw bolt 42 is screwed onto the other side 41b of the arm 41. The type of pressing mechanism is not critical, as long as it is a pressing mechanism capable of closely contacting and fixing 32, such as a wedge.

(Effects of the invention) This invention has an extremely simple structure and can be installed in front of the transformer without taking up much space, and has a one-touch attachment/detachment function that allows automatic centering and strong electrical connection at the same time. It is extremely easy to work with, and there is no risk of misalignment during use, making it highly practical as a lead for heating coils.

[Brief explanation of the drawing]

1A and 1B are a perspective view and a plan view, respectively, of an embodiment of the present invention, and FIG. 2 is a perspective view showing a prototype example before the invention is completed. C...Heating coil, Cc...Heating conductor part, 1...
...Power supply side output terminal, 20...Fixed lead part, 22
... Pivot terminal section, 23 ... Output terminal section, 24 ...
Positioning piece, 25... Flange part, 30... Connection lead part, 32... Input terminal part, 33... Fitting part, 40
...Clamp part, 41...Arm, 41a...One side part, 41b...Other side part, 42...Press mechanism, P...Pin connection.

Claims (1)

[Scope of utility model registration request] The lead section that connects both ends of the heating conductor section and both output terminals on the power supply side is composed of a fixed lead section, a connecting lead section, and a clamp section, and one end of each of the fixed lead sections is connected to both output terminals on the power supply side. A pivot terminal part having a structure that can be pivoted is formed into a plate-shaped output terminal part with the other end bent outward at a right angle, and a convex positioning piece is provided at a predetermined position on the front end surface of the output terminal part, One end of each of the connection lead parts is connected to the heating conductor part, and the other end is bent outward at a right angle to form a plate-shaped input terminal part having approximately the same size as the output terminal part of the fixed lead part. , a fitting part consisting of a recess or a through hole corresponding to the positioning piece is provided on the front end surface of the input terminal part, and the opening width of the clamp part is at least equal to or larger than the sum of the plate thicknesses of the output terminal part and the input terminal part. One side of the arm is connected with a flange formed at a predetermined position on the back end surface of the output terminal section, and the other end is movable outward, and the other side is is a lead portion of a heating coil which is equipped with a pressing mechanism whose other side serves as a reaction force receiver so that the pressing force is directed toward the one side.