US2241904A - Vacuum vessel - Google Patents

Description

'A. GAEBEL VACUUM VESSEL May 13, 1941.

Filed July 19, 1939 Patented May 13, 1941 VACUUIVI VESSEL Alfred Gaebel, Berlin, Germany, assignor to C. Lorenz Aktiengesellschaft, Berlin-Tempelhof, Germany, a company Application July 19, 1939, Serial No. 285,227 In Germany July 26, 1938 4 Claims.

The invention relates to the means by which parts belonging to the equipment of electron tubes, vacuum switches and the like are held in position within the bulb thereof. More particularly, the invention is concerned with the use of mica discs fastened to such equipping parts and arranged to contact with the bulb in a manner to support these.

Since such mica discs must be given a predetermined standard size the pressure with which they bear upon the bulb depends upon the diameter thereof, which thus also determines the reliability of the supporting action so afiorded. However, as it is not possible to manufacture glass bulbs, for instance, without their shape undergoing comparatively great inaccuracies, the aforesaid equipping parts frequently prove to be in too tight or too loose engagement with the bulb.

This is of disadvantage with vacuum switches of the kind in which the equipping parts are mounted on a cover piece to which the glass bulb is to be sealed. Such sealing is in most cases efiected in a kiln or furnace in order to soften the vitreous material arranged on the joint between cover piece and bulb. It then the bulb is clamped fast by its engagement with the switching system the sealing may fail to be suitable.

In accordance with the invention constructional parts arranged in a vacuum vessel are held in position by clamping pieces of mica which do not contact with the wall of the vessel when assembling devices of this kind.

In the accompanying drawing, Fig. 1 is a partially diagrammatic sectional view representing an intermediate stage of the manufacture of one embodiment of the invention. Fig. 2 shows a section on line 2-2 of Fig. 1 and viewed in the direction of the arrows. Fig. 3 is a fragmentary view similar to Fig. 1 and in which the device to which Figs. 1 and 2 refer is shown as finished. Fig. 4 represents a section on line 44 of Fig. 3. Fig. 5 is a fragmentary sectional view showing a second embodiment of the invention. Fig. 6 illustrates a section on line 6-6 of Fig. 5.

In a. glass bulb l the switching system 2 of a vacuum switch is arranged. With system 2, Figs. 1 and 2, two mica elements 3, 4 are connected by metallic supports 5, 6. When inserting the system 2 in the bulb l the mica elements 3, 4 do not contact with the wall thereof. It is not until the several parts have been assembled to form the device represented in Figs. 3 and 4 that the mica elements 3, 4 are brought to contact with the bulb I. This is done by bending the supports 5, 6 outward so as to give them the position shown in Figs. 3 and 4. Supports 5 and 6 are attached to system 2 in any well known manner such as by welding.

Bulb I has a cover piece I fastened to it, through which lead-in conductors l2 extend which are connected to the system 2 and are sealed into the cover piece I in well known manner.

The construction shown in Figs. 5 and 6 is essentially the same as that represented in Figs. 1 to 4. The mica elements I0, I I are here arranged to face the surrounding wall of the bulb I so as to contact therewith flatwise, and they are fixed to metal discs 8, 9 carried on the supports 5, 6.

When manufacturing the device shown in Figs. 1 to 4 the assembly 2, 5, 6, 3, 4 is inserted in the bulb i with the mica elements 3, 4 in the position represented in Figs. 1 and 2. The supports 5, 6 are then bent outward until the elements 3, 4 come against the wall of the bulb and until they contact therewith with sufilcient pressure to support the system 2. The supports 5, 6 may be pressed apart by means of a tool inserted through an opening 3A in the bulb, such as the opening where the well known sealing-oil or exhaust tube is fixed.

The manufacture of the device shown in Figs. 5 and 6 is quite the same as that described with reference to Figs. 1 to 4.

What is claimed is:

1. A vacuum vessel comprising a bulb having an aperture therein, an equipment assembly, a supporting member attached to said bulb, means for mounting said assembly on said member, bendable supports fastened to said assembly and mounted in accessible relation to said aperture, and spacer elements for said assembly attached to said supports.

2. A vacuum tube Vessel comprising a bulb having at least two apertures therein, an equipment assembly, a cover piece for one of said apertures sealed to said bulb, means for mounting said assembly on said cover piece, bend-able supports fastened to said assembly and arranged to be accessible from the other of said apertures whereby said supports may be bent after sealing of said cover piece to said bulb, and mica supporting elements for said assembly attached to said supports.

3. A vacuum vessel according to claim 1, wherein said elements are made of mica and are arranged transversely of the axis of the bulb.

4. A vacuum vessel according to claim 1, wherein said elements are made of mica and further comprising metal discs fixed to the mica elements, the mica elements being arranged to face the bulb wall surrounding them.

ALFRED GAEBEL.

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