US2773928A

US2773928A - Tube shield device

Info

Publication number: US2773928A
Application number: US184921A
Authority: US
Inventors: Camp Scipione M Del
Original assignee: Individual
Current assignee: Individual
Priority date: 1950-09-15
Filing date: 1950-09-15
Publication date: 1956-12-11
Anticipated expiration: 1973-12-11
Also published as: GB697191A

Description

ZWEQZE S. M. DEL CAMP TUBE SHIELD DEVICE 2 Sheets-Sheet 1 Filed Sept. 15 1950 .x a a \NVENTOR SuPmNE M. DEL CAMP, BY JAIL RTTORNEY I Dec. 11, 1956 Filed Sept. 15 1950 Fae. 4

s. M. DEL CAMP 2,773,928

TUBE SHIELD DEVICE 2 Sheets-Sheet 2 I \NVENTOR Sumoua M. DEL CAMP,

PW TORNEY United States Patent TUBE SHIELD DEVICE Scipione M. Del Camp, Maywood, 11!.

Application September 15, 1950, Serial No. 184,921

2 Claims. (Cl. 174-35) This invention relates to a tube holding device for a tube assembly.

It is common practice in radio and television to shield an electronic tube by means of a tubular can which encloses the tube and is grounded to the set chassis. When the installation is subjected to vibration or other motion as in automobiles and aircraft the tube may move with relation to the socket which in the case of high frequency tubes tends to change the frequency.

The object of my invention is the provision of a nonrattle assembly between the tube and shield member which includes a spring member disposed within a tubular shield in attached assembly therewith and providing spring elements for embracing and holding snugly the tube so as to limit movement thereof relative to the shield.

Other objects and advantages of the invention will be apparent to those skilled in the art from a consideration of the accompanying drawing and annexed specification illustrating and describing a preferred embodiment of the invention.

In the drawings:

Fig. 1 is a vertical cross-sectional view of the tube and shield mounting with the spring member, tube and socket member shown in full;

Fig. 2 is a section taken along the line 22 of Fig. 1;

Fig. 3 is a section taken along the line 3-4; of Fig. 1;

Fig. 4 is a section taken on the same line as Fig. 3 and showing the shield member and spring member prior to assembly with the tube;

Fig. 5 is a front elevation of the spring member per se, and

Fig. 6 is a top view of the spring member shown in Fig. 5.

Referring to the drawings, the shielded tube assembly comprises a socket member 1 secured to a metal supporting plate 2 by means of a metal mounting member 3 which provides ears 3a riveted to the upper surface of the plate 2. The tube socket may be of any suitable construction commonly used for the reception and mounting of pronged tubes and embodies a body portion 4 of suitable insulating material provided with a series of prong-receiving openings (not shown) in which are fitted metal contacts having integral wiring terminals 5 extending from the socket. The socket 1 is designed to support and make electrical contact with a suitable tube 6 which provides prong terminals (not shown) for engagement with the metal contacts of the socket member as is usual in the art. The shield member 7, often referred to in the art as a shield can, is preferably formed of metal and comprises a tubular body portion 8 of a diameter and length to enclose and shield the tube 6 and has an inwardly extending flange 9 at its upper end (Fig. l) defining a central opening 19. The shield member 7 may have any suitable means for attachment and grounding to plate 2 but in the form in which I have chosen to illustrate the invention, the shield member provides a flange 11 which on rotation of the shield member rela- Patented Dec. 11, 1956 tive to the socket mounting member 3 snugly receives the laterally extending attaching elements 12 (Fig. 1) provided by the socket mounting member 3. The preferred method which I have chosen to illustrate attachment of the shield member in electrical contact with the supporting plate 2 forms no part of my present invention and is the subject of my co-pending application, Serial No. 164,543.

As a means for carrying out the purpose of my invention which is to effect a non-rattle relationship between the tube and shield member, I have provided a spring member 13 which is disposed within the bore of the shield member and provides spring elements in embracing engagement with the tube when the parts of the tube mounting are in assembly. Referring specifically to the construction of the spring member 13, it is preferably made from a single piece of spring sheet metal rolled into a sleeve-like part having a slot 14 extending axially the entire length of the part. Opposed slots 15 (Fig. 5) disposed in substantially perpendicular relation to the slot 14 intersect the slot 14 and extend therefrom circumferentially into the body of the sleeve member. The slots 15 divide the sleeve member into two substantially ring-

shaped portions

16 and 17 which are integrally joined at the back or base 17a of the sleeve. The upper ring-shaped portion 16 is normally of greater diameter than the lower ring-shaped portion 17 and provides resilient attaching elements 18-18 at its ends adjacent the slot 14. The diameter of the ring-shaped portion 16 is normally greater than the interior diameter of the shield member with the result that the attaching elements 18-l8 will be contracted when the spring member is disposed within the shield member to engage the inner wall of the shield member and hold the spring member in assembly therewith. The lower ring-shaped portion 17 is of a diameter which is normally less than the diameter of the tube member 6 and provides spring attaching elements 1919 at its end adjacent the slot 14 which embrace and hold the tube member when the parts of the mounting are in assembly. The ring-shaped portion 17 is preferably of non-circular configuration (Figs. 4 and 6) so that when it is assembled within the bore of the shield member it will engage the inner wall thereof at circumferentially spaced points.

In assembling the spring member 13 with the shield member, the end of the spring member providing the ring-shaped portion 16 is inserted into the open end 20 of the shield member and, thereafter, the spring member is moved axially of the bore of the shield member until the edges 21 of the ring-shaped portion 16 engage the flange 9 of the shield member. 'During this action in which the spring member is inserted into the bore of the shield member, the attaching elements 18-18 will be contracted and when the spring member is in final position, the tendency of the attaching elements 18-18 to return to normal position causes a spring tension to be exerted on the interior wall of the shield member, as most clearly shown in Fig. 2, so as to hold the spring member in frictional assembly with the shield member. The ring-shaped portion 17 in my preferred form has a normal diameter slightly greater than the interior diameter of the shield member '7 with the result that it will engage the interior wall of the shield member at two or more circumferentially spaced points 21 (Fig. 4) and the edges 2222 of the attaching elements 19-19 will be contracted slightly toward each other.

In assembling the shield assembly with the tube 6, the tapered end 23 of the tube member will enter the open end of the spring member and as the shield member is moved into engagement with the plate 2 the normal diameter of the tube member will engage the attaching elements 1919 so as to expand them into engagement 'ice with the interior wall of the shield member as most clearly shown in Fig. 2. At the same time other portions of the ring-shaped portion 17 may be expanded to assume a more concentric shape with relation to the tubular bore of the shield member as shown in Fig. 3. Thus, the ring-shaped portion 17 operates to embrace frictionally the tube member, but its frictional engagement with the tube and shield wall is not so great that it will limit relative rotation with respect to either the tube or shield when the shield is rotated into fastened attachment with the socket mounting member 3. As a result, the assembly effects a stiff cushion between the tube member and the shield member which serves to take up any opportunity for play between the parts. Thus, movement of the tube relative to the shield member caused by vibration or jar is absorbed by the spring member and a relatively non-movable assembly is provided.

Although I have illustrated and described a preferred embodiment of my invention, I do not wish to be limited thereby as the scope of my invention is best defined by the following claims.

I claim:

1. A shield assembly for a vacuum tube including a tubular shield member having an opening at one end for receiving said tube, and a tube embracing spring disposed in said shield member, said spring being in the form of a sleeve having an axial slot for its entire length,

said sleeve having opposed lateral slots intersecting said axial slot and extending therefrom into the body of said sleeve to form upper and lower ring-like portions joined on a side of said shield opposite said axial slot said upper ring-like portion being in frictional engagement with the inner wall of said shield member to hold said spring in assembly therewith, and said lower ring-like portion having a tube-receiving opening in alinement with the bore of said shield member.

2. The assembly of claim 1 in which said lower ringlike portion is of non-circular configuration and in engagement with the inner wall of said shield member at circumferentially spaced points.

References Cited in the file of this patent UNITED STATES PATENTS 90,055 Shoemaker et a1. May 11, 1864 833,042 Gilbert Oct. 9, 1906 2,062,256 Del Cam-p Nov. 24, 1936 2,182,607 Alden Dec. 5, 1939 2,358,491 Del Camp Sept. 19, 1944 2,398,626 Del Camp Apr. 16, 1946 2,575,601 Staver Nov. 20, 1951 FOREIGN PATENTS 350,471 Great Britain June 4, 1930