JPS6035193Y2 - Connection structure of heating element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connecting structure for heating elements such as nichrome wire, which can be electrically conductive and securely fixed with screws.

Conventionally, heating elements such as nichrome wire were wound around mica plates, etc.
Both ends of the heating element were fixed by screws, and the current was supplied by the screws.

In this case, if you directly tighten the heating element with a screw, the heating element may be cut due to the compression force (because the heating element is fragile), so fix the heating element with an eyelet and insert the screw into the eyelet. electrical continuity and fixation.

However, since a screw with a flat head was used to press the eyelet, there was a drawback that the screw and eyelet could rotate freely and could not be firmly fixed.

In view of the above-mentioned drawbacks, the present invention makes the contact surface of the screw tapered, the inner circumferential surface of the eyelet is also tapered, and the cut formed on the outer circumference of the screw is engaged with the groove of the eyelet.

To provide a connecting structure for a heating element that allows screws and eyelets to be crimped together without slipping.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a support plate made of mica or asbestos, and around the outer periphery of this support plate 1 heating elements 2 formed in a band shape of nichrome wire or the like are wound at equal intervals.

Both ends of the heating element 2 are located at one end of the support plate 1, and are fixed by being wrapped around the outer periphery of an eyelet 3 fixed to one end of the support plate 1.

This eyelet 3 has an inner circumferential surface 4 tapered as described later, and a radial groove 5 (eyelet 3) on the outer circumference.
(formed when crushed with a punch) is a provision.

Reference numeral 6 denotes a screw that is inserted into the eyelet 3, and an engagement groove 7 is formed in the head of the screw to be engaged with a driver, and the engagement groove 7 extends to both ends of the head of the screw 6. U-shaped cuts are formed at both ends of the head.

The circumferential surface 8 of the head of this screw 6 is formed into a tapered shape, and the inclination angle of the conical taper is approximately the same as the inclination of the inner circumferential surface 4 of the eyelet 3.

Reference numeral 9 denotes a pair of electrode plates made of metal for supplying current, and each electrode plate 9 is provided with an opening 10 through which a screw 6 is inserted.

Numeral 11 is a nut screwed into screw 6.

Next, the operation of this embodiment will be explained.

To fix the support 1, the screw 6 is passed through the opening in the eyelet 3, then the screw 6 is passed through the opening 10 and screwed into the nut 11.

By rotating the nut 11, the screw 6 comes into close contact with the eyelet 3, and the eyelet 3 and support plate 1 are fixedly held on the electrode plate 9 in the state shown in FIG.

At this time, the circumferential surface 8 of the screw 6 comes into close contact with the inner circumferential surface 4 of the eyelet 3, and its inclined surface acts to spread the eyelet 3, so that the eyelet 3 comes into pressure contact with the heating element 2 wrapped around the outer circumference. It works like this.

Further, the notch on the outer periphery of the head of the screw 6 engages with the groove 5 of the eyelet 3, so that the screw 6 does not follow the rotation of the nut 11 and has a rotation prevention effect.

In this embodiment, a continuous engagement groove 7 is formed on the screw 6, but it may be ten-shaped, or an engagement protrusion may be formed on the circumferential surface 8.

Since the present invention is configured as described above, the screw and the eyelet engage when tightening the screw, and the screw does not rotate freely, making it easy to fix the screw.

Furthermore, since the inner circumferential surface of the eyelet and the circumferential surface of the screw are inclined, the inner circumferential surface of the eyelet and the circumferential surface of the screw are reliably pressed against the heating element, and the conductivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view showing the state before fixing, and FIG. 3 is a sectional view showing the state after fixing. 1...Support body, 2...Heating element, 3...
...Eyelet, 4...Groove, 5...
-Inner peripheral surface, 6...screw, 8...peripheral surface.

Claims (1)

[Scope of utility model registration request] Fix the eyelet to the support with the heating element attached, wrap the end of the heating element around the outer periphery of the eyelet, form the inner neck surface of the eyelet into a tapered shape, and taper the circumferential surface of the head of the screw inserted into the eyelet. What is claimed is: 1. A connection structure for a heating element, characterized in that the screw is formed into a shape, a cut is formed in the head of the screw, and the cut of the screw is engaged with a groove of an eyelet to prevent rotation of the screw.