JPS58945Y2 - anode cap - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an anode cap that is fitted onto an electron tube such as a cathode ray tube.

As shown in FIGS. 1 and 2, a conventional anode cap has an insulating base 2 attached to the inside of a bowl-shaped insulating cap 1 made of rubber or the like, and this insulating base 2 has a fitting cavity at the tip of the base of the cathode ray tube. Three electrically conductive engagement strips 6 that can be opened freely and have engagement protrusions 5 that engage with the edges of the three fitting holes 4 and electrode terminals 7 that are insulated from the electrically conductive engagement strips 6 are provided. , an escape ring 8 is fitted to the outer periphery of each of the engagement strips 6, one end is locked to the escape ring 8, and the other end is connected to the insulating base 2.
This configuration includes a coil spring 9 interposed therebetween.

With such a conventional anode cap structure, when attaching the anode cap to the cathode ray tube by press-fitting the spring strip 6 of the insulating cap 1 into the fitting cavity 3 at the base of the cathode ray tube, the coil spring 9 is inserted in order to reduce the diameter of the spring strip 6. Since the compression requires a large force that resists the elasticity of the coil spring 9, there is a risk of destroying the cathode ray tube.Also, when removing the anode cap from the cathode ray tube, the movement of the spring 6 has no direction, so metal There is a risk of deforming the fitting cavity 3, which is manufactured by the manufacturer, and the removal work of the anode cap is difficult.

Furthermore, in order to engage the spring strip 6 with the fitting cavity 3 and securely attach the anode cap to the cathode ray tube, the spring strip 6 is inserted into the fitting cavity 3.
In addition, an escape ring 8, a coil spring 9, etc. are required, which has the drawback of increasing the number of parts, increasing the number of assembly steps, and increasing manufacturing costs.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks and provide an inexpensive anode cap that can be reliably attached to a cathode ray tube, is easy to remove, and has a small number of parts. The insulating base has a vertical groove communicating with the through hole drilled in the upper flange facing the outer peripheral surface of the lower cavity fitting cylinder, and is attached to the insulating base. The conductive engagement piece has a retaining protrusion that engages with the edge of the fitting hole of the fitting cavity at the tip of the leg with the middle bent, and the conductive engagement piece inserted through the through hole is formed. The legs are fitted into the vertical grooves so as to be able to move in and out, and the base end of the conductive retaining piece is held on the upper part of the insulating base, and an electrode terminal is buried inside the center of the insulating base. and the anode cap.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, reference numeral 10 denotes a bowl-shaped insulating cap made of rubber or the like. An insulating base [1] is embedded inside this insulating cap 10, and this insulating base 11 has a flange 12 surrounding it at the top and a stepped section at the bottom. It is formed in a cylindrical shape with a cavity-fitting cylindrical portion 14 having a small diameter.

A fork-shaped electrode terminal 15 is buried inside the center of the insulating base 11 as shown in FIG. 6A.
One end is disposed at the center of the upper opening of the insulating base 11, and the other end is disposed at the center of the bottom opening of the cavity fitting cylindrical portion 14 of the insulating base 11.

It goes without saying that instead of the fork-shaped electrode terminal 15, a disc-shaped electrode terminal 15a having a disc at the bottom as shown in FIG. 6B may be used.

A semicircular peripheral wall cover 16 extends from the edge of the upper opening of the insulating base 11, and a pair of insulating cap mounting pieces 17.
17 is provided to protrude laterally.

In addition, a mounting piece 1 for an insulating cap is provided on the outer peripheral surface of the insulating base 11.
7. A pair of vertical grooves 18 facing each other at positions orthogonal to 17,
18 is bored, and the vertical grooves 18, 18 reach the bottom end of the cavity fitting cylindrical part 14.

Furthermore, the flange 12 is provided with through holes 19, 19 which communicate with the longitudinal grooves 18, 18, respectively.

Next, the conductive retaining piece 20 that is attached to the insulating base 11 so as to be openable will be described.

The engagement piece 20 is formed into a bifurcated shape with two legs 21.21 bent at right angles in the middle, and a locking protrusion 21a is protruded from the tip of each leg 21. A connecting piece 25 having a gripping piece 23 for caulking and gripping the insulating cap mounting piece 17 and a lead wire gripping piece 24 is integrally provided at the base end 22 that connects the legs 21 and 21.

A lead wire 26 is caulked and held by the lead wire gripping piece 24 and a shield wire 27 of the lead wire 26 is connected to the lead wire gripping piece 24 . It is connected to the.

To attach the conductive engagement piece 20 to the insulating base 11,
First, the two legs 21 of the retaining piece 20 are inserted into the through holes 19.19 of the flange 12, and then the legs 21 are respectively fitted into the vertical grooves 18.18 provided on the outer peripheral surface of the insulating base 11. and do it.

At this time, the engagement protrusion 21a of the leg 21 and a part of the edge of the leg 21 protrude from the vertical groove 18, and the engagement protrusion 21a of the leg 21 protrudes from the vertical groove 18.
The legs 21 are set so as to be able to move in and out of the vertical groove 18 so that the locking protrusion 21a is accommodated in the vertical groove 18 by pressing the leg 21a into the vertical groove 18.

Further, a part of the leg 21, the base end portion 22, and the connecting piece 25 of the engaging piece 20 are placed on the upper surface of the insulating base 11, and the gripping piece 23 of the connecting piece 25 is a mounting piece for an insulating cap provided on the flange 12. 17. It is crimped to grip one side of 17.

In this way, the conductive retaining piece 20 is attached to the insulating base 11.

Next, the operation will be explained. When the insulating cap 10 is press-fitted from the cavity fitting cylindrical part 14 of the insulating base 11 attached to the fitting hole 31 of the fitting cavity 30 of the cathode ray tube, it protrudes from the outer peripheral surface of the cavity fitting cylindrical part 14. The engaging protrusion 21a of the engaging piece 20 is pressed against the upper edge of the fitting hole 31, is housed in the vertical groove 18, and is further press-fitted,
When the engaging protrusion 21 a passes the fitting hole 31 , it expands outward and engages with the lower edge of the fitting hole 31 .

Next, when removing it, as shown in FIG. 9, use a detachable fitting 32 whose aperture widens outward to remove the edge of the leg 21 that partially protrudes from the vertical groove 18 near the step 13 of the insulating base 11. When pressed, the leg 21 bends and the engagement protrusion 21
a is accommodated in the vertical groove 18 and disengaged from the edge of the fitting hole 31, so that the anode cap can be removed from the round tube by pulling out the insulating cap 10.

As described above, the anode cap according to the present invention is constructed such that the insulating base is attached to the inside of the bowl-shaped insulating cap, and the retaining piece is formed in a forked shape and has two legs each having a retaining protrusion at the tip. was attached, and the legs of the retaining piece were inserted into the vertical grooves drilled on the outer circumferential surface of the insulating base so that they could be freely moved in and out. When press-fitted into the fitting hole of the fitting cavity at the base of the cathode ray tube, the legs of the engaging piece bend and the retaining protrusion of the engaging piece protruding from the outer circumferential surface of the insulating base is easily accommodated in the vertical groove of the insulating base. As a result, the engaging protrusion then engages with the edge of the fitting hole, and the anode cap is attached very smoothly, eliminating the risk of damaging the cathode ray tube.

Also, when removing the anode cap from a cathode ray tube, if you use a simple attachment/detachment tool, you can press a part of the leg of the retaining piece that protrudes from the outer circumferential surface of the insulating base, and the leg will bend and the engaging protrusion will form a vertical groove. Moreover, the movement of the retaining protrusion is guided by the vertical groove and has directionality, so the anode cap can be removed extremely smoothly and there is no risk of deformation with the metal fitting cap. .

Furthermore, the anode cap according to the present invention incorporates the conductive engagement piece into the insulating base attached to the inside of the insulating cap so that the legs can be opened freely, and utilizes the deflection of the legs of the engagement piece itself, so that other members can be easily attached. The number of parts is reduced, the number of assembly steps is reduced, and manufacturing costs can be reduced.

[Brief Description of the Drawings] Fig. 1 is a sectional view of a conventional anode cap, Fig. 2 is a sectional view of main parts of the same anode cap, Fig. 3 is a sectional view of an anode cap according to the present invention, and Fig. 4 5 is a perspective view of the insulating base with the insulating cap removed from the anode cap, FIG. 5 is a vertical cross-sectional view taken along line II in FIG. 4, FIG. 6A is a perspective view of the fork-shaped electrode terminal, and FIG. 6B The figure is a perspective view of a disc-shaped electrode terminal, Figure 7 is a perspective view of a conductive locking piece, and Figure 8 shows a state in which the locking piece of the anode cap is locked in a fitting cavity of a cathode ray tube. FIG. 9 is a cross-sectional view of the main part showing a state in which the locking piece is released from the fitting cavity similarly to FIG. 6, and FIG. 10 is a perspective view of the attachment/detachment tool. 10... Insulating cap, 11... Insulating base, 12... Flange, 15, 15 a...
... Electrode terminal, 18.18 ... Vertical groove, 19
．． 19... Through hole, 20... Conductive retaining piece, 21.21... Leg, 21 a, 21
a... Engaging protrusion, 22... Base end portion.

Claims (1)

[Scope of utility model registration request] The insulating base mounted inside the bowl-shaped insulating cap has a vertical groove communicating with the through hole drilled in the upper flange facing the outer peripheral surface of the lower cavity fitting cylinder part. The conductive retaining piece attached to the insulating base has a retaining protrusion that engages with the edge of the fitting hole of the fitting cavity at the tip of the leg bent in the middle, and the through-hole The leg of the conductive retaining piece that has been inserted is fitted into the longitudinal groove so as to be able to move in and out, and the base end of the conductive retaining piece is held on the upper part of the insulating base, and the leg is inserted into the center of the insulating base. is an anode cap characterized by embedded electrode terminals.