US2529279A

US2529279A - Vacuum tube support

Info

Publication number: US2529279A
Application number: US38720A
Authority: US
Inventors: Edgar W Breisch
Original assignee: Union Switch and Signal Inc
Current assignee: Hitachi Rail STS USA Inc
Priority date: 1948-07-14
Filing date: 1948-07-14
Publication date: 1950-11-07
Anticipated expiration: 1967-11-07

Description

Nov. 7, 1950 E. w. BREISCH VACUUM TUBE SUPPORT Filed July 14, 1948 INVENJ'OR. Edge Brecsclz.

HIS

ATTORNEY Patented Nov. 7, 1950 VACUUM ,TUBE SUPPORT Edgar W. Breisch, Edgewood, Pa.,'assignor to'The Union Switch & Signal Company, Swissvale, Pa., a corporation of Pennsylvania Application J ulyl l, 1948, Serial No. 38,720

My invention relates to vacuum tube su ports,

and more particularly to means for protection of vacuum tubes from vibration. imp-act and shock.

It is well known that vibration, impact and shock applied to vacuum tubes may damage the tube elements and may impair the tub-es operating characteristics. Many types of tubes are standard commercial items which are produced bvlarge-scale methods in or er to reduce their cost. The design and construction of such standard tubes are in a large me sure based on thesupposition that t e tubes will be used in equipment located in relatively quiet places, such as in radio receivers located in homes.

In certain uses, such as, telephone systems for railwa trains and like mobile units, the tubes of the equipment become subjected to vibration, impact and shock much more severe than that for which their construction is designed. It has been found that vibration and impact to which the vacuum tubes of train telephone systems are subjected tend to gradually loosen the crimped section of metal tubes of standard commercial desi n allowing movement bet een, the metal shell and the base, and this continued movement flexes and strains the connection leads from the tube elements to the base pins, and eventually one or more of these leads may become broken, thus prematurely ending the service life of the tube.

This means that systems using tubes under severe operating conditions must resort to a specially designed tube which greatly increases 'thefirst cost or else must resort, to frequent tube inspection and replacement which increases the cost of maintenance of the system.

Again. in many of these tube uses, proper ventilation of the tube is essential for its desired operation due to the relatively high temperature at which the tube operates.

In view of the aforementioned conditions in vacuum tube uses, a feature of my invention is the provision of an improved vacuum tube support to lessen the effects of vibration, shock and 7 Claims. (01. 25.0-27.5)

ple and rugged design to permit its construction at-low cost, which does not have parts diflicult for the maintainer to handle and which will automatically grip the tube tighter as the vibration becomes excessive;

Other features, objects and advantages of my invention will appear as the specification progresses.

I shall describe one form of vacuum tube support embodying my invention, together with certain modifications that I may use and which also embody t e invention, and shall then point out the novel features thereof in claims.

I In the accompan ing drawings, Figs. 1 and 2 are an elevation View pa tly in section and a plan. View, r spectively. showing a support embodving my invention when applied to a metal envelope t pe of vacuum tube. Fig. 3 and 4 are frasn ental views showing modifications of the tube sup ort of Fi s. v a d 2 and which modifications also embody the invention.

In each of the several views, like reference characters designate similar parts.-

Refe ring'to the drawings'the reference character l6 designates'a Vacuum tube having a metal envelope i and a base 12 to which the pins of the t be electrodes are brought out for connection with the tube socket in the usual manner. The tube Ill may be any one of many ty es of tubes of this general construction. A tube socket i3 is mounted in any suitable manner in a panel or base plate It for receiving the pins of the tube It! for connection with the outside circuits, the tube being inserted'into the socket and firmly held in place therein in the usual arrangement.

' The panel or base plate is may be of any suitable material, and it is a part of the chassis or other frame work not shown on which the tube and its related equipment are mounted, the chassis in turn being secured in a suitable housmg.

It is apparent that vibration and shock applied to the housing will be transmitted to'the panel M and in turn transmitted-through 'the tube socket to the tube itself and for communication systems using tubes carried on railway trains, the vibration and shock transmitted to the tubes l0 may be relatively severe notwithstanding the chassis on which the tubes are carried may itself be supported in the housing :by shock absorbing means. To protect the tube .89 against the effects of vibration and shock, I provide a tube support for each individual tube of the equipment; This tube support comprises two tube.

major parts, a supporting annular shell I and a flexible ring I6.

The annular shell I5 is a tubular member having an inside diameter somewhat greater than the maximum outside diameter of the tube envelope II and its base I2. The shell I5 is preferably a metal shell and as shown in Fig. 1, it is formed with a flange I'I so that the shell may be secured to the panel I4 by the flange I! being riveted as by rivets I8 to the panel. This shell I5 is assembled on the panel I4 to be coaxial with the tube socket I3 and with the tube II] when inserted in the socket. The shell I5 is of a length suflicient to surround the tube' II] a given distance above the tube base. The upper or free end of the shell I 5 is flared outwardly, as will be apparent by an inspection of Fig. 1, for its upper portion to provide a conical seat. Preferably the length of the shell I5 is made such that a conical seat of a given length is provided and with the base of the seat somewhat above the top of the base of the tube when the tube is inserted in the socket. The flexible ring I6 is formed with an inside diameter substantially equal to the outside diameter of the metal envelope I I of the The outer surface of the ring I6 is made wedge shaped to fit into the conical seat of the shell I5. Thus the ring I6 when slipped over the tube I0 provides a snug fit around the tube and a complete seat in the shell I5. The width of the ring I5 is made suflicient so that a small portion of the ring extends above the upper rim of the shell I5. The ring I6 is of a material which will withstand high temperatures without appreciable deterioration and without losing its flexibility. Preferably the ring I6 is made of Silicone compound. In this position around the tube, the

the shell I5.

For ventilation of the tube, the ring I6 is preferably made with grooves on the inside surface of the ring, as best shown in Fig. 2. Also, as an aid to the ventilation of the tube, the shell I5 is preferably perforated around its lower straight portion as illustrated at in Fig. 3. This arrangement has been found to provide sufficient ventilation around the lower portion of the tube and for the tube itself so that the tube can operate without excessive temperature.

In place of the shell I5 being formed with a flange I1 and secured to the panel I4 as by rivets, the shell I5 may be formed with ears 2| and the panel I4 formed with corresponding holes through which the ears 2| may be inserted, and the ears bent over to secure the shell to the panel, this modification in the mounting of the shell being illustrated in Fig. 3.

As shown in Fig. 4, threaded spade lugs 22 may be riveted or welded to the lower portion of the shell I5 and the panel I4 drilled to receive the threaded portion of the lugs 22 and the shell I5 secured to the panel I4 by lock washers 24 and nuts 23 run down on the threaded portion of the lugs.

With the shell I5 assembled on the panel I4 around the tube socket, the tube I0 is inserted in the socket in the usual manner and the flexible ring I6 of the tube support is then slipped over the tube and pressed into the seat on the shell.

To remove the tube it is only necessary to grasp the upper portion of the tube envelope and pull the tube from the socket in the normal way. Should there be a tendency for the flexible ring I6 to bind the tube in the shell I5, this can be overcome by pressing upward against the portion of the ring extending above the rim of the shell. It follows that with the tube in place in the socket, the flexible ring of the support can be readily applied to the tube and the support will cause little or no hindrance in the removal of the tube from the socket.

construction to be of low cost, and it is free from having parts that require removal or adjustment by a maintainer.

Although I have herein shown and described but one form of vacuum tube support embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is:

1. A vacuum tube support for protection of a tube when it is inserted in a socket mounted on a housing panel, comprising, an annular shell having dimensions for it to surround the tube to be protected with a given clearance, said shell having one end secured to said panel coaxial with the tube socket and its free end flared to form a conical seat, said shell of a length for its free end to extend above the base of said tube, and a rin of flexible Silicone like plastic material having an inside diameter to slip over the tube body and its outer surface wedge shaped to fit said conical seat of said shell.

2. A vacuum tube support for protection of a tube against vibration and shock when the tube is inserted in a socket mounted on a housing panel, comprising, a metal annular shell having an inside diameter greater than the outside diameter of the base of the tube, said shell having one end secured to the panel coaxial with the tube socket and of a length for the free end of the shell to extend a given distance along the tube above the tube base, the free end of the. shell flared to form a conical seat, the base of the conical seat being above the tube base, a ring of flexible material of Silicone like compound and having an inside diameter substantially equal to the diameter of the tube body and its outer surface made wedge shaped to fit said conical seat of said shell, and said ring of a width to extend a little above said shell when the ring is slipped over the tube and seated in said shell.

3. A vacuum tube support for protection of a tube against vibration and impact when the tube is inserted in a socket mounted on a housing panel, comprising, a metal tubular member dimensioned to surround the vacuum tube with some clearance, said member having one end flanged and riveted to said panel coaxial with the vacuum tube when the tube is inserted in its socket, said tubular member having its free end flared to form a conical seat the base of which is above the top of the vacuum tube base, a flexible ring of Silicone like plastic material and which is characterized to withstand a relatively high temperature without loss of flexibility, said ring di-- mensioned to slip over the vacuum tube body and its outer surface made wedge shaped to fit said conical seat of said tubular member, and said ring having a grooved inner surface to provide ventilation for the vacuum tube when the ring is slipped over the tube and seated in said tubular member.

4. A support for protection of a metal type vacuum tube against vibration and impact when the tube is inserted in a socket secured to a base plate, comprising, a metal annular shell secured to said base plate coaxial with said tube when it is inserted in the socket, said shell having an inside diameter to surround the tube and its base with a given clearance and of a length to extend along the tube a given distance above the tube base, the free end of said shell expanded to form a conical seat with the base of the seat above the tube base, a ring of soft plastic like flexible material which is characterized to withstand a relatively high temperature with no loss of flexibility, said ring having an inside diameter to permit the ring to be slipped on the tube body and an outer surface made wedge shaped to fit said conical seat of the shell when the ring is slipped over the tube, said ring having its inner surface grooved to give ventilation to the tube, and said shell provided with perforations below the conical seat to aid in the ventilation of the tube.

5. A support for protection of a metal type vacuum tube against vibration and impact when the tube is inserted in a socket mounted on a housing panel, comprising, a metal annular shell having an inside diameter to permit the shell to surround the tube with some clearance, said shell having ears on one end securing the shell to said panel coaxial with said tube when it is inserted in said socket, said shell having its free end expanded to provide a conical seat, a ring of flexible Silicone compound material which is characterized by maintaining its flexibility at relatively high temperatures, said ring having an inside diameter that permits the ring to be slipped over said tube with a snug fit and its outside surface shaped to fit said seat of said shell, and said ring having a width for the ring to extend above the free end of said shell to aid in loosening the ring when the tube is removed from its socket.

6. A support for protection of a vacuum tube against vibration and impact when the tube is inserted in a socket mounted on a housing panel, comprising, a metal annular shell having an inside diameter to permit the shell to surround the tube with a given clearance, said shell secured at a one end to said panel coaxial with the tube when it is inserted in said socket, said shell of a length for its free end to extend a given distance above the tube base and having its free end expanded to form a seat, a ring of flexible Silicone like material, said ring being characterized by maintaining its flexibility at relatively high temperatures, said ring adapted to slip over said tube with a snug fit and having its outer surface formed to fit said seat of said shell, and of a width to extend a little above the free end of the shell when in place on said shell seat, and said ring formed with grooves and said shell formed with perforations to ventilate the tube.

'7. A support for protection of a vacuum tube against vibration and impact when the tube is inserted in a socket mounted on a housing panel, comprising, a metal annular shell having an inside diameter to permit the shell to surround the tube with a given clearance, a plurality of spade lugs secured to one end of said shell and having their free ends threaded, said panel provided with openings to secure said shell to said panel coaxial with said tube when inserted in its base by nuts run down on the threaded portions of said lugs, said shell of a length to extend a given distance up along the tube and having its free end flared to form a seat, and a ring of flexible Silicone like material, said ring having an inside diameter only slightly greater than the outside diameter of the tube and having its outer surface formed to fit said seat of the shell for said ring to slip over the tube and fit onto the seat of the shell.

EDGAR. W. BREISCH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PA'AI'ENTS