JPH028606Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to an electric soldering iron, and is intended to reduce the temperature difference between the tip temperature and the plate-shaped heating element to prevent damage to the heating element. applied to.

BACKGROUND OF THE INVENTION In electric soldering irons, a heating element for heating the tip has been removably inserted into a circular concave hole provided on the rear end surface of the tip.

However, with this configuration, a slight gap is always formed between the inner circumferential surface of the recessed hole of the tip and the outer circumferential surface of the heating element inserted into this, but the size of this gap does not depend on the size of the gap. In some cases, the temperature of the iron tip is higher than that of the heating element.
In addition to being about 100 to 200 degrees lower, it is impossible to iron the inner surface of the recessed hole in the tip, so if you heat the tip to a temperature suitable for soldering, the temperature of the heating element will become too high. The heating element cannot be plated with iron, causing oxidation at high temperatures and causing seizure between the heating element and the inner circumferential surface of the tip, making it impossible to attach and detach, and also shortening its lifespan.

Problems that the invention aims to solve This invention was created in view of the above circumstances.
In addition to reducing the temperature difference between the heating element and the tip, it also makes it easier to iron the iron tip that comes into contact with the heating element to prevent them from seizing, and the plate-shaped heating element can be used as a heating element protection member. It is designed to prevent damage to the heating element by gripping it.

Means for Solving the Problems In order to solve the above-mentioned problems, this invention grips the tip of a plate-shaped heating element with a bent portion provided on the tip side of a heating element protection member superimposed thereon, The heating element and the base end of the heating element protection member are attached to the heating element holder attached to the inner space of the handle, and the heating element is placed on a horizontal plane formed at the rear end of the soldering tip so as to pass through the center thereof. The tip side of the heating element is held, and the tip side of the heating element is pressed against the horizontal surface of the tip by a curved surface formed to elastically contact the inner surface of the exterior pipe in the length direction of the heating element protection member. This is how it was done.

Function In the electric soldering iron with this configuration, when the base end of the exterior pipe is held on the handle side by the cap nut, the plate-shaped heating element whose tip is held by the heating element protection member is removed from the exterior. The heating element protection member that elastically contacts the inner surface of the pipe receives a force that presses the lower surface of its tip against the horizontal surface provided at the rear end of the iron tip. Improves adhesion with.

Embodiment In FIG. 1, the upper half of the cylindrical shape of the rear end of the iron tip 1 is removed to form a rectangular horizontal surface 1a. On the other hand, the handle 2, which has a hollow part 2a in the axial direction, is equipped with a heat-resistant heating element holder 3 that can be split vertically into two parts at the center of the opening on the tip 1 side. Then, a plate-shaped heating element 4 is attached to the two-part part of the heating element holder 3.
and a heating element protection member 5 made of a thin stainless steel plate polymerized thereon.

As shown in FIGS. 2 to 4, the heating element protection member 5 has U-shaped bent portions 5a facing downward on both sides of the distal end on the iron tip 1 side, and when assembled in the length direction of both axial ends. A curved surface 5b that elastically contacts the inner surface of the exterior pipe 6 is provided upward, and a bending locking portion 5c for positioning is formed upward at the rear end portion held by the heating element holder 3. . The heating element 4 is usually made of ceramics,
The lower portion of the heating element protection member 5 corresponding to the U-shaped bent portions 5a, 5a is at least the bent portion 5.
Even when it is formed thinly by the thickness of a (see Fig. 3) and is held by the heating element protection member 5,
Half of the tip in the length direction can come into contact with the horizontal surface 1a of the iron tip 1. In this embodiment, the heating element 4 is held by the U-shaped bent portions 5a formed on both sides of the tip of the heating element protection member 5, but it is possible to hold the heating element 4 by other configurations. Of course.

The connection between the heating element 4 and the power cord 7 passed through the hollow part 2a of the handle 2 is made by connecting the power cord 7, which is attached to the rear part of the heating element holder 3 and stored in the hollow part 2a of the handle 2, in the vertical direction. A lead wire 9 is fixed to the rear end of the heating element 4 inside the splittable cord holder 8.
This is done by combining it with the tip of cord 7. Reference numeral 10 denotes a stopper for locking the cord holder 8 to the stepped portion 2b of the handle 2, and the power cord 7 inside the handle 2 is taken out to the outside through a cord protection bushing 11 fitted into the opening at the rear end of the handle 2. .

The opening side of the tip of the handle 2 is provided with a short tube 12a through which the heating element holder 3 can be inserted, in order to protect the heating element holder 3 protruding from the handle 2 and to hold the tip 1 on the handle 2 side. nipple 1
2 are screwed together. The nipple 12 is provided with a plurality of openings 13 at intervals in the circumferential direction on its outer circumferential surface to prevent the temperature of the handle 2 from rising due to the heating element 4. A cap nut 14 for fixing the iron tip 1 to the handle 2 via the exterior pipe 6 is screwed onto the tip side of the nipple 12.

The exterior pipe 6 has an inwardly inclined retaining surface 6a formed at one end to retain the tapered surface of the cylindrical outer peripheral surface of the soldering iron tip 1, and an inwardly inclined retaining surface 6a for retaining the tapered surface of the cylindrical outer circumferential surface of the iron tip 1, and an inwardly inclined retaining surface 6a for retaining the tapered surface of the cylindrical outer peripheral surface of the iron tip 1. The short pipe 12 of the nipple 12 is in contact with the pipe rotation stopper ring 15.
An outward facing flange 6b is formed to be pressed against the end surface of a.

When the heating element is configured as above, the iron tip 1
When the proximal end of the exterior pipe 6, which is integrated with
The plate-shaped heating element 4 whose tip end is held by the heating element protection member 5 is pressed downward by the curved surface 5b that elastically contacts the inner surface of the exterior pipe 6, so that the lower surface of the tip of the heating element 4 is , is brought into close contact with the horizontal surface 1a of the iron tip 1, thereby significantly reducing the temperature difference between the iron tip 1 and the heating element 4. Therefore, the heating temperature of the heating element 4 when heating the iron tip 1 to the same temperature can be significantly lowered compared to the conventional case. Moreover, the horizontal surface 1a of the rear end of the iron tip 1
Since iron plating can be easily performed on the iron plating, it is possible not only to reliably prevent seizure between the heating element 4 and the iron tip 1 due to high-temperature oxidation, but also to prevent the heating element 4 from burning due to high temperature oxidation.
The service life of the soldering iron tip 1, etc. can be extended.
In addition, the inner surface of the exterior pipe 6 has a heating element protection member 5.
Since the heating element 4 is pressed against the curved surface 5a of the iron tip 1 and restrained from rotating relative to the heating element protection member 5, the heating element 4 is prevented from being torsioned by the horizontal surface 1a of the iron tip 1 when the iron tip 1 is attached to the handle 2. Damage caused by moments can be effectively prevented. When the pipe rotation prevention ring 15 is built into the cap nut 14, it is possible to reduce the torque transmitted to the exterior pipe 6 via the flange 6b when rotating the cap nut 14, so that the heating element 4 due to the torsional moment can be reduced. damage is even less.

Effects of the invention This invention grips the tip of a plate-shaped heating element on the tip side of the heating element protection member superimposed thereon, and elastically abuts the tip of the heating element against the inner surface of the exterior pipe. Since the curved surface of the heating element protection member is pressed against the horizontal surface of the iron tip, the temperature difference between the iron tip and the heating element is reduced to prevent damage caused by seizure or high-temperature oxidation of both. In addition, it is possible to prevent the heating element from being damaged by the torsional moment acting on the heating element from the horizontal surface of the iron tip.

[Brief explanation of drawings]

Figure 1 is a longitudinal sectional view of one embodiment of this invention;
3 is a front view of the heating element protection member, FIG. 4 is a left side view of the same, and FIG. 5 is a front view of FIG. 1. 1...Tip, 1a...Horizontal surface, 2...Handle,
2a...Space part, 3...Heating element holder, 4...
Heating element, 5...Heating element protection member, 5a...Bending portion, 5b...Curved surface, 6...Exterior pipe, 14
... Bag nut, 15 ... Pipe rotation prevention ring.

Claims (1)

[Claims for Utility Model Registration] (1) In an electric soldering iron whose tip is heated by a plate-shaped heating element and held on the handle side by a cap nut at the base end of an exterior pipe, Grip the tip of the heating element with the bent portion provided on the tip side of the heating element protection member superimposed thereon,
The heating element and the base end of the heating element protection member are attached to the heating element holder attached to the inner space of the handle, and the heating element is placed on a horizontal plane formed at the rear end of the soldering tip so as to pass through the center thereof. The tip side of the heating element is held and the tip side of the heating element is pressed against the horizontal surface of the tip by a curved surface formed to elastically contact the inner surface of the exterior pipe in the length direction of the heating element protection member. An electric soldering iron characterized by: (2) The electric soldering iron according to claim 1, wherein the cap nut at the base end of the exterior pipe has a built-in ring for preventing rotation of the pipe.