US3150247A

US3150247A - Coaxial connector and switch combination

Info

Publication number: US3150247A
Application number: US190499A
Authority: US
Inventors: Robert G White
Original assignee: Tektronix Inc
Current assignee: Tektronix Inc
Priority date: 1962-04-26
Filing date: 1962-04-26
Publication date: 1964-09-22
Anticipated expiration: 1981-09-22
Also published as: NL290902A; SE313610B; GB1031988A

Description

Sept. 22, 1964 R. e. WHITE 3,150,247

COAXIAL CONNECTOR AND SWITCH COMBINATION Filed April 26, 1962 2 Sheets-Sheet l //V l/EN TOR.

ROBERT G. WHITE BUCKHORN, CHEATHAM 8 BLORE ATTORNEYS p 1964 R. G. WHITE 3,150,247

COAXIAL CONNECTOR AND SWITCH COMBINATION Filed April 26, 1962 2 Sheets-Sheet 2 m/vszvrae ROBERT 6. WHITE ar y BUCKHORN, CHEATHAM 8 BLORE ATTORNEYS United States Patent gnor to Telrtronix,

The present invention relates generally to electrical connectors and switches and in particular to a coaxial connector and switch combination for connecting a coaxial cable transmission line to an electrical apparatus in a plurality of dilierent ways depending upon the position of such switch.

The electrical connector and switch device of the present invention is especially useful as the input terminal for the vertical signal preamplifier of a cathode ray oscilloscope. This coaxial cable connector and switch device may be used to change the electrical connections of such vertical signa input terminal between two or three switch positions including an AC. position, a DC. position and a ground position. In the AC. switch position the inner conductor of the coaxial cable connector is connected through a direct current blocking capacitor to the vertical signal preamplifier. In the 11C. position such inner conductor is directly connected to the vertical preamplifier by short-circuiting the blockin capacitor, while in the ground position the conductor is disconnected and the vertical preamplifier is connected to ground.

The switch portion of the electrical connector and switch device of the present invention is made integral with such connector and has its switch contacts positioned within such connector in order to reduce the capacitance and the inductance of such device so that the input signal supplied by the coaxial cable is transmitted through such device without appreciable distortion of such signal. Another advantage of this coaxial cable connector and switch device is its simple, inexpensive and rugged construction. The combining oi a coaxial cable connector and switch into an integral device also results in less wiring time and fewer soldered connections along with shorter lead lengths to provide a more reliable device with better lngh frequency characteristic". Still another advantage is a saving of mounting space on the control panel of the oscilloscope since formerly the switch and coaxial connector were mounted separately in spaced positions on such panel.

Brien one embodiment of the electrical connector and switch device of the present invention includes a connector member in the form of a coaxial cable transmission line section having an inner signal-carrying conductor coaxially mounted inside an outer shield conductor and insulated therefrom with one end of each of such conductors adapted to be connected to a coaxial cable transmission line. A rotary switch is supported by such connector member including a rotary switch contact mounted inside the outer conductor adjacent the other end of such outer conductor for rotation on the inner conductor between a plurality of different switch positions while the rotary contact engages such inner conductor. A stationary switch member including at least one stationary switch contact is also mounted inside the outer conductor of the connector member so that such stationary contact is insulatingly spaced from the inner conductor and the outer conductor and is positioned to be engaged by such rotary contact in one of such switch positions. A knob member is mounted outside of the connector member on the outer conductor and is connected to the rotary contact by a connecting pin extending through such outer conductor for rotating such rotary contact into the diierent switch positions in order to change the electrical connections of the inner conductor of such coaxial cable transmission line.

ice

It is therefore one object of the present invention to provide an improved electrical connector and switch device.

Another object of the invention is to provide an improved electrical transmission line connector and switch device having low inductance and capacitance so that such device transmits an electrical input signal without substantial distortion.

A further object of the present invention is to provide an improved coaxial cable connector and switch device of simple and inexpensive construction so that both the connector and switch are integrally formed in a single device.

Still another object of the present invention is to provide a coaxial cable connector and switch device which requires little wiring time and fewer soldered connections and allows shorter lead lengths so that such device has a more reliable operation and better high frequency characteristics.

An additional object of the present invention is "to provide an improved coaxial cable connector and switch device for mounting on the control panel or" an electrical apparatus, such as a cathode ray oscilloscope, and having an integral construction to save mounting space on such front panel.

A still further object of the present invention is to provide an improved coaxial cable connector and switch device for use as the input terminal for the vertical preamplifier of the cathode ray oscilloscope so that such input terminal can be switched between an AC. input signal position, a DC. input signal position and a ground position by rotation of a knob member in such device.

Other objects and advantages of the present invention will become apparent after referring to the following detailed description of a preferred embodiment thereof and to the attached drawings of which:

FIG. 1 is a perspective view of the front of one embodiment of the electrical connector and switch device of the present invention; 4

FIG. 2 is a vertical section taken along the line 2-2 of P16. 1;

PEG. 3 is a rear end view of FIG. 2;

FIG. 4 is a vertical section View taken along the line 4-4 of PEG. 2;

FIG. 5 is a vertical sectional view taken along the line 55 of FIG. 2;

FIG. 6 is an exploded perspective view of one embodiment of the switch contacts of the device of FIG. 1 for a two-position switch; and

FIG. 7 is an exploded perspective view of another embodiment of the switch contacts of the device of FIG. 1 for a three-position switch.

The electrical connector and switch device of the present invention shown in FIGS. 1 and 2 includes a coaxial cable connector 1% and a two-position rotary switch 12 formed integral with such connector. The connector 19 includes a cylindrical rod inner conductor 14 and a hollow tubular outer conductor including a first outer conductor member l5 and a second outer conductor member 18 which are coaxially mounted with the inner conductor so that such inner conductor is spaced from such outer conductor by a pair of tubular insulating members 2t? and 21. The first outer conductor member 16 has a web flange portion 22 extending radially outward on the exterior surface of such conductor member between the two ends of such conductor member. The large diameter end of outer condu tor member 1% is adapted to be connected to the outer conductor of a coaxial cable transmission line (not ion/n) by means of external screw threads 24 and the small diam ter end of such mem er is also provided with external screw threads 25 for attachment to the second switch contact 70 in the form of a rivet.

outer conductor member 18. The inner conductor 14 has an enlarged connector end 26 in the form of a cylindrical plug receptacle which is split into several spring finger portions that engage the central signal-carrying conductor of the coaxial cable. The connector end 26 of the inner. conductor fits inside a passage way in the insulator member which is held in place within the first outer conductor member '16 by a retaining ring 28 seated in a notch in the inner surface of such outer conductor member and the internal shoulder of flange 22. The inner conductor 14 is also held in place by a knurled portion 30 that engages the inner surface of the insulating member 21 which is secured inside the first outer conductor member 16 by :1 rolled edge 32 of reduced diameter on the small end of such member. The second outer conductor member 13 is attached to the first outer conductor member 16 by internal screw threads 34 on the small diameter end portion of such member which engages the external screw threads 25 on such first outer conductor member. The larger diameter end portion of the second outer conductor member 18 is adapted to be attached to a mounting surface, such as the control panel of a cathode ray oscilloscope, by means of external screw threads 36 and a flat key surface 37. An intermediate web flange portion 38 is also provided between the large and small diameter end portions of such member.

The rotary switch 12 includes a cylindrical knob member 40 which is mounted between the flange portions 22 and 38 of the outer conductor members so that it rotates about such conductor members but is prevented from longitudinal movement with respect to such conductor members by such flange portions. This knob member is "suitably secured to a knob insert 42, such as by an epoxy resin adhesive, so that the inner surface of such knob insert slides on the outer surface of the small diameter end portion of the second outer conductor member 13. The knob member 40 may be made of plastic material with a suitable switch position pointer or index 44 located on the front end of such knob member where it can be seen by the operator. A rotary switch contact support plate 46 of insulating material is connected to knob member 40 by means of a connecting pin 48 which is secured inside a cavity in the rear end of the knob insert 42 by adhesive or other suitable means and extends through an arcuate slot 50 in the web flange 38 into a passageway in the support plate,46. As shown in FIG. 6, a rotary 'switch contact 52 in the form of a leaf spring is secured to the inner conductor 14 by a pair of spring fingers 54 which engage the inner conductor in all switch positions so that such rotary contact is always electrically connected tosuch inner conductor. The rotary contact 52 is keyed to the support plate 46 by a pair of stops 56 at one end of such plate positioned on either side of the contact end of such rotary contact so that both the'support plate and the rotary contact rotate together about the inner conductor 14 when the knob member 40 is turned between two switch positions for A.C. or DC. connection of said inner conductor.

The A.C. and DC. switch positions are determined by a detent mechanism mounted in a cavity in the rear end knob insert 42. This detent mechanism includes a ball bearing detent 58 positioned on top of a coiled detent spring 60 so that such detent engages one of two

detent notches

62 and 64 circumferentially spaced in the outer surfaceof the web flange 38 of the second outer conductor member 18. The rotary switch contact 54 is positioned adjacent a stationary switch contact support plate 68 of insulating material which is provided with a stationary The stationary contact 70 extends through a tapered hole in switch plate 68 so that it is held by a friction fit and the head of said stationary contact is in position to be engaged by the rotary contact 52 in one of the two switch positions. A pair of guide ramp portions 72 extend from the opposite sides of the rotary contact 52 to guide the stationary constationary contact 7%.

tact up onto such rotary contact during the switching operation. The stationary support plate 68 is mounted on the inner conductor rod 14 against an annular shoulder on the inside surface of the large diameter end of outer conductor member 18 and is held in position by a retaining ring 74 which is seated ina radial notch in the interior surface of such end of such outer conductor member. This retaining ring 74 is keyed to the outer conductor member 18 and the stationary switch plate 68 by a key portion '75 which engages a keyway slot in such member and is positioned between a pair of raised projections 77 on the surface of the plate to prevent the rotation of such plate, as shown by the rear View of FIG. 3.

The inner conductor 14 of the connector and switch device of the present invention may be connected through a blocking capacitor 76 to the vertical preamplifier of the cathode ray oscilloscope in the A.C. switch position. The stationary switchcontact 7G is connected to shortcircuit this blocking capacitor '76 when such stationary contact engages the rotary contact 52 so that it corresponds to the DC. switch position.

The two switch positions of the rotary switch including knob member 4!? are shown clearly in FIGURE 5. The furthest clockwise first switch position of the. knob member 49 corresponds to the position 45A of the connecting pin 4-3 in the slot 50 through web flange 38 of the second outer conductor member 18, when the ball detent 58 is in the detent notch 62. This first switch position corresponds to the DC. position in which the blocking capacitor 76 is short-circuited by rotary contact 52 engaging The furthest counter-clockwise second switch position corresponds to the position 48B of the connecting pin when the detent 58 engages detent notch 64 so that the rotary contact 52 is positioned in contact with the insulator surface of stationary support plate 6% remote from the stationary contact 70. This second switch position corresponds to the A.C. position when the signal transm'tted through the inner conductor 14 must be transmitted through the DC. blocking capacitor 76.

As shown in FIG. 7, the rotary switch 12 of the connector and switch device of FIG. 1 may be provided with a third switch position in which the inner conductor 14 is disconnected and the input lead to the vertical preamplifier is connected to ground. This ground switch position may be employed when calibrating the vertical preamplifier of the oscilloscope. However, it is not possible to do this merely by providing a second stationary to the inner conductor 14 by a metal coating 84 on the rear surface of support plate 68.

The second stationary contact 80 is connected through blocking capacitor 76 to the vertical preamplifier, while the third stationary contact 76' is connected directly to such preamplifier without passing through such capacitor. Fourth stationary contact 82 is connected to ground through another metal coating 36 on the rear surface of support plate 68, which extends around the periphery of such plate so that it is in contact with the second outer conductor member 18. These metal coatings 84 and 86 on support plate 68' may be formed in the manner of a printed circuit.

The rotary switch contact member 52' of FIG. 7 is provided with three

separate spring contacts

88, 90 and 92 which are made from a single piece of metal so they are interconnected by a common support portion 94. This rotary contact member 52' is mounted on a rotary support plate as of insulating material with the common support portion 94 positioned in an arcuate. groove 96 in the rear surface of such plate so that the three

rotary contacts

88, 90 and 92 are seated in three

separate notches

98, 106 and 102, respectively, adjacent such groove. The rotary support plate 46' is pivoted about the inner conductor 14 by the connecting pin 48 when the switch knob 40 is rotated between three switch positions corresponding to stationary contacts 79, 3t and 82. Gbviously a third detent notch (not shown), in addition to detent notches 62 and 6- must be provided in order to allow three switch positions. Thus, in the AC. switch position

rotary contacts

90 and 92 engage the head ends of stationary contacts 7% and 80, respectively, to interconnect these first and second stationary contacts so that the input signal in the inner conductor flows through DC.

locking capacitor 76. In the D.C. switch position the rotary contacts 83, 9t) and 92, engage stationary contacts 78, 8t) and 70, respectively, to interconnect the first and third stationary contacts so that the input signal can flow directly to the vertical preamplifier without passing through the blocking capacitor. Finally, in the ground switch position the rotary contacts 88, fit? and 92 engage the stationary contacts 8d, '70 and 82, respectively, to interconnect the third and fourth stationary contacts so that the input of the preamplifier is direcly grounded and is disconnected from the input signal in inner conductor 14. The blocking capacitor 76 is short-circuited in the DC. and ground switch positions to prevent charging of such capacitor and to insure that such a charge signal is not added to the input signal transmitted when the switch is rotated to the next A.C. position.

It will be obvious that various changes may be made in the details of the preferred embodiment of the present invention. For example, the coaxial cable connector it) may be provided with a conventional ENC bayonet-type connector, instead of the screw-type Ul-LF. connector shown, for attachment to the coaxial cable while the first and second outer conductor members lo and 18 may be formed as an integral piece it one of the flange portions is replaced by a retaining ring in order to enable mounting of the knob member and knob insert. Also, any number of switch positions may be employed with a corresponding increase or decrease in the number of stationary switch contacts. Therefore, it is not intended to limit the scope of the present invention to the above-described preferred embodiments thereof and such scope should only be determined by the following claims.

I claii 1. An electrical connector and switch device for changing the connections to a transmission line comprising:

a connector member including an inner signal-carrying conductor and an outer shield conductor, having one end adapted to be connected to said transmission line;

a movable switch member including a movable switch contact, mounted inside said connector member at its other end for movement between a plurality of different switch positions;

a stationary switch member including at least one stationary switch contact, mounted inside said shield conductor so that said stationary contact is positioned to be engaged by said movable contact in at least one of said switch positions; and

leans mounted outside said connector member and extending through the side of said shield conductor for moving said movable switch member into said difierent switch positions in order to change the electrical connec ion of said transmission line without substantially distorting in said connector and switch device the electricfl signal supplied by said transmission line.

2. An electrical connector and switch device for connecting a transmission line to electrical apparatus in several diilerent ways, comprising:

a connector member including an inner signal-carrying conductor and an outer shield conductor, in the form of a transmission line section having one end adapted to be connected to said transmission line;

a movable switch member including a movable switch contact, mounted inside said connector member at its other end for movement about said signal conductor between a plurality of diiterent switch positions;

a stationary witch member including at least one stationary switch contact, mounted inside said shield conductor so that said stationary contact is positioned to be engaged by said moveable contact in at least one of said switch positions; and

knob means mounted outside said connector member and extending through a slot in the side of said shield conductor for moving said movable switch member into said different switch positions in order to change the electrical connection of said transmission line to said apparatus without substantially distorting in said connector and switch device the input signal supplied by said transmission line.

3. An electrical connector and switch device for connecting a transmission line to electrical apparatus in several different ways, comprising:

a connector member including an inner signal carrying conductor and an outer shield conductor, in the form of a transmission line section having one end of both of said conductors adapted to be connected to said transmission line;

a rotatable switch member including a rotary switch contact, mounted inside said shield conductor at its other end for rotation about said signal conductor between a plurality of different switch positions;

a stationary switch member including at least one stationary switch contact, mounted inside said shield conductor so that said stationary contact is insulated from said shield conductor and is positioned to be engaged by said rotary contact in at least one of said switch positions; and

knob means rotably mounted on the outside of said shield conductor for rotation about said shield conductor, said knob means having a coupling element extending through the side of said shield conductor for rotating said rotary switch member into said different switch positions in order to change the electrical connection of said transmission line to said apparatus without substantially distorting in said connector and switch device the input signal supplied by said transmission line.

4. An electrical connector and rotary switch device for connecting a coaxial cable transmission line to electrical apparatus in several difierent ways, com .sing:

a connector member including a cylindrical inner signal carrying conductor and a tubular outer ground conductor, in the form of a coaxial cable transmission line section having one end of both of said condoctors adapted to be connected to said transmission line;

a rotatable switch plate having a movable switch contact attached the eto, mounted inside said ground conductor at its other end for rotation on said signal conductor between a plurality of different switch positions while said rotary contact engages said signal conductor;

a stationary switch plate, at least one stationary switch contact attached thereto, mounted inside said ground conductor so that said stationary contact is insulated from said ground conductor and said signal conductor and is positioned to be engaged by said rotary contact in one of said switch positions; and

knob means including a knob member rotably mounted on the outside surface of said ground conductor for rotation about said ground conductor and a coupling member extending through a slot in the side of said ground conductor and attached to both said rotatable switch plate and said ltnob member, for rotating said rotary switch m mber into said diilerent switch positions by rotation of said coupling member about said signal conductor in order to change the electrical connection of said transmission line to said apparatus without substantially distorting in said connector and switch device the input signal supplied by said transmission line.

order to connect said knob member with said rotary contact so that they rotate together.

7. An electrical connector and switch device for connecting a coaxial cable transmission line to a cathode 5. An electrical connector and switch device for connecting a transmission line to electrical apparatus in several different ways, comprising: a

a tubular outer conductor having one end adapted to be connected to said transmission line and its other end adapted to be attached to said apparatus, and having a pair of spaced flange portions on the exterior surface between the ends of said outer conductor;

a rotary switch member including a rotary switch contact mounted for rotation about said inner conductor inside said outer conductor, while said rotary contact is in engagement with said inner conductor, between a plurality of switch positions;

a stationary switch member including at least one stationary switch contact fixedly mounted inside said outer conductor so that it is spaced from said inner conductor and said outer conductor by insulating material, and is positioned to engage said rotary ray oscilloscope in several different ways, comprising;

a tubular first outer conductor member having one end adapted to be connected to said coaxial cable and its other end adapted to be attached to another outer conductor member, and having a first flange pora cylindrical inner conductor mounted inside said outer tion on tha exterior Surface betwean the ends of conductor so that it is insulated from said outer Said first Outer COIldllctOI;

conductor, having one end adapted to be connected a tubular second outer conductor member having one to i transmission line and another 6nd adapted end attached to said other end of said first outer conto be connected to Said apparatus; ductor and its other end adapted to be secured to a rotary switch contact mounted for rotation about said 531d 0561110560175 and havmg a Second flange P inner conductor inside Said Outer Conductor, While tion on the exterior surface between the ends of said said rotary contact is in engagement with said inner 9 conductor; Conductor, between a plurality cf switch positions; a cylindrical mner conductor coaxially mounted mslde a stationary switch contact fixedly mounted inside said sald second outel: confluctor members so outer conductor so that it is insulated from said a It 1S 1n5u1ated from Said outer conductor inner conductor and said outer conductor and is posibersihavmg one end adaptfid to be connected to 531d tioned to engage said rotary switch contact in one coaxlal cab}? l another end adapted to be of said switch positions; acted 05911086096;

a knob member mounted for rotation about said outer a mtary swltc}? Contact member Including a plurality conductor and positioned between said flange porof t rotary contacts. t t {ions on the exterior of Said Outer Conductor to for rotation about said inner conductor inside said vent longitudinal movement of said knob member; SeFOHd outer conductor mfimber whlle l i from and said outer conductor members and said inner cona connecting element extending through said outer con- S .plurahty Switch posmons;

ductor inside a slot in one of said flange portions plurahty. f Sta/90mm swltch Contacts fixedly and attached at one end to said knob member outmounted mslfie i Second Outer coilductor memside said outer conductor and at its other end to b so that Sald statlonary con/[.2193 are Insulated from said rotary switch contact inside said outer coneach.0ther and are F POSIUOHFCI engageipne ductor in order to connect said knob member with of s rotary e m 9 of Sald swltch ppsmons said rotary contact so that they rotate to ether. 40 to miercoxinect sald stauonfry contacts Wlth one 6. An electrical connector and switch device for conof Said sfauonary contacts befmg connected to ground necting a coaxial cable transmission line to electrical apand another Connected to Sald i conductcir; paratus in Several different Ways comprising: a knob member mounted for rotation about said outer a tubular outer conductor having one end adapted to conductor {members outslde thfareof and Posmoned be connected to said coaxial cable and its other end between f first flange P01451011. and said adapted totbe attached to said apparatus and havflefinge pomqn to prevent llmgltudmal movement o ing a pair of spaced flange portions extending ou- Salli i Wlth respect to Sald conductor m wardly on the exterior surface between the ends of a Spring blaseq detent member mounted on i knob Said outer conductor; member ad acent said second flange portion and a cylindrical inner conductor coaxially mounted inside pcsltlqned so .that sad deftent member will engage a said outer conductor so that it is spaced from said Plurahty of cucumferentlflny Spaced detent i f outer conductor by insulating material, having one the Outer fa i 5 g pjrtlon m end adapted to be connected to said coaxial cable older 9 detefmme Salli Swltc q an and another end adapted to be connected to said a connectmg pm exteridlllg through sald Second anparatus conductor member inside a radial slot through said second flange portion and attached to said knob member to said rotary switch contact in order to connect said knob member with said rotary switch contact so that they rotate together. 8.tAn electrical connector and switch device for connecting a coaxial cable transmission line to a cathode ray oscilloscope in several different ways, comprising:

a cylindrical first outer ground conduct-or member of circular cross-section having one end adapted to be connected to said coaxial cable and its other end adapted to be attached to another outer conductor switch contact in one of said switch positions; r

a knob member mounted for rotation about said outer b and havmg a first Web fiang? 119mm} on the conductor and positioned betwesn Said flange pop exterior surface between the ends or said first outer tions on the exterior of said outer conductor to preconductor; vent longitudinal movement of said knob; a tubular second outer ground conductor member of a detent member mounted on said knob member adcufiular crosssecuorf havmg one end attached jacent one f Sal-d flange Portions and positioned so said other end of said first outer conductonand ts that Said detent membgr will engage a plurality f larger other end adapted to be secured to sald oscilspaced detent notches in the outer surface of said 10560133, and having a Second Web flange Portion one flange portion in order to determine said switch the exterior surface between the ends of said second positions; and outer conductor;

a cylindrical inner signal carrying conductor coaxially mounted inside said first and second outer conductor members so that it is spaced from said outer conductor members by insulating material, having one end adapted to be connected to said coaxial cable and another end adapted to be connected to said oscilloscope;

a rotary switch member including a rotary switch contact, mounted for rotation about said inner conductor inside said larger end of said second outer conductor member in between a plurality of switch positions while said rotary contact is in engagement with said inner conductor;

a stationary switch member including a pair of spaced stationary switch contacts, fixedly mounted inside said larger end of second outer conductor member so that said stationary contacts are spaced from said inner conductor and said outer conductor members by insulating material, and are each positioned to engage said rotary switch contact in one of said switch positions;

a knob mounted for rotation about said outer conductor mem outside thereof and positioned between said first flange portion and said second flange portion to prevent longitudinal movement of said knob with respect to said outer conductor members;

a spring biased detent member mounted inside a cavity in the surface of said knob adjacent said second flange portion and positioned so that said detent member will engage a plurality of circumferentially spaced detent notches in the outer surface of said second flange portion in order to determine said switch positions; and

a connecting pin attached to said knob, extending through said second outer conductor member inside a radial slot through said second flange portion and 19 attached to said rotary switch contact inside said second outer conductor member in order to connect said knob with said rotary switch contact so that they rotate together.

9. An electrical connector and switch device for connectmg a transmission line to electrical apparatus in several different ways, comprising:

a tubular outer conductor having one end adapted to be connected to said transmission line and its other end adapted to be attached to said apparatus;

an inner conductor mounted inside and said outer conductor so that it is insulated from said outer conductor, and having one end adapted to be connected to said transmission line and another end adapted to be connected to said apparatus;

a rotary switch contact mounted for rotation about said inner conductor inside said outer conductor between a plurality of switch positions;

a stationary switch contact fixedly mounted inside said outer conductor so that it is positioned to engage said rotary switch contact in one of said switch positions;

a knob member mounted for rotation about said outer conductor; and

a connecting rod extending through the side of said outer conductor inside a slot in said outer conductor and attached at one end of said knob member outside said outer conductor and at its other end of said rotary switch contact inside said outer conductor in order to connect said knob member with said rotary contact so that they rotate together.

References Cited in the file of this patent UNITED STATES PATENTS Jacques et a1. Jan. 31, 1956 Kandoian et a1 Aug. 21, 1956 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,150,247 September 22, 1964 Robert G. White It is hereby certified that error appears in the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 64, strike out "22"; line 64 and 65,

strike out "on the exterior surface of such conductor member"; line 66, after "end" insert 22 column 3, line 10, for "flange" read end line 28, after "the" insert web same line 28, and line 29, strike out "22 and 38".

Signed and sealed this 18th day of May 1965.

(SEAL) Auest:

ERNEST W. SWIDER EDWARD J BRENNER Ancsting Officer Commissioner of Patents

Claims

9. AN ELECTRICAL CONNECTOR AND SWITCH DEVICE FOR CONNECTING A TRANSMISSION LINE TO ELECTRICAL APPARATUS IN SEVERAL DIFFERENT WAYS, COMPRISING: A TUBULAR OUTER CONDUCTOR HAVING ONE END ADAPTED TO BE CONNECTED TO SAID TRANSMISSION LINE AND ITS OTHER END ADAPTED TO BE ATTACHED TO SAID APPARATUS; AN INNER CONDUCTOR MOUNTED INSIDE AND SAID OUTER CONDUCTOR SO THAT IT IS INSULATED FROM SAID OUTER CONDUCTOR, AND HAVING ONE END ADAPTED TO BE CONNECTED TO SAID TRANSMISSION LINE AND ANOTHER END ADAPTED TO BE CONNECTED TO SAID APPARATUS; A ROTARY SWITCH CONTACT MOUNTED FOR ROTATION ABOUT SAID INNER CONDUCTOR INSIDE SAID OUTER CONDUCTOR BETWEEN A PLURALITY OF SWITCH POSITIONS; A STATIONARY SWITCH CONTACT FIXEDLY MOUNTED INSIDE SAID OUTER CONDUCTOR SO THAT IT IS POSITIONED TO ENGAGE SAID ROTARY SWITCH CONTACT IN ONE OF SAID SWITCH POSITIONS; A KNOB MEMBER MOUNTED FOR ROTATION ABOUT SAID OUTER CONDUCTOR; AND A CONNECTING ROD EXTENDING THROUGH THE SIDE OF SAID OUTER CONDUCTOR INSIDE A SLOT IN SAID OUTER CONDUCTOR