US3074011A - Turret device for electric circuits - Google Patents

Turret device for electric circuits Download PDF

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US3074011A
US3074011A US768191A US76819158A US3074011A US 3074011 A US3074011 A US 3074011A US 768191 A US768191 A US 768191A US 76819158 A US76819158 A US 76819158A US 3074011 A US3074011 A US 3074011A
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rotor
frame
shaft
annular
annular structure
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US768191A
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Langdon C Hedrick
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Tektronix Inc
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Tektronix Inc
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner

Definitions

  • This invention relates to a turret device for electric circuits and more particularly to a device in which the components of a plurality of separate electric circuits are carried by a rotor in a manner which enables the rotor to be indexed to selectively connect any one of such circuits into an external circuit and in which the rotor is easily removed and disassembled for inspection or repair.
  • the rotor of the turret device is made up of an annular central structure and a pair of circular end members.
  • the annular structure has axially extending bores or apertures containing circuit components and provides a hollow interior for the reception of additional circuit components.
  • the rotor is slidable laterally of its central axis into position between journal elements forming part of a stationary frame. The journal elements hold the various parts of the rotor in assembled position by preventing axial separation of the end members.
  • the frame also carries a detent mechanism adjacent one end of the rotor and separate therefrom and a rotor shaft is rot-atively received'in the journal elements of the frame but is nonrotatively received in the end members of the rotor and also in the detent mechanism.
  • the shaft is slidable axially of itself in the journal elements and also in the end members of the rotor and in the detent mechanism so as to be removable from the frame and rotor by a movement axially of the shaft.
  • the annular structure carries a plurality of circumferentially spaced contacts which selectively engage stationary contacts carried by the frame for connecting the individual electric circuits, such as attenuator circuits, into an external circuit.
  • the stationary contacts are all on one side of the rotor so that the rotor may be removed from the frame by a motion laterally of its axis away from such contacts after the shaft has been removed by a motion axially of such shaft.
  • annular structure includes annular portions having a plurality of circumferentially spaced axial extending bores, certain of which contain adjustable capacitors each including a cylindrical sleeve of conducting material and a plunger of conducting material separated from the sleeve by a layer of insulating material. Provision is made for ad justing the plungers axially of the sleeves and holding such plungers in adjusted position.
  • the sleeves referred to have radially extending portions at one end thereof which provide the contacts on the rotor above referred to, and which also provide connecting elements for circuit components positioned within the rotor.
  • the adjusting mechanism for the plungers preferably include spring elements engaging screw threads upon plunger stems of reduced diameter, the spring elements also being employed for making connections to other circuit components.
  • Another object of the invention is to provide a turret device in which a rotor made up of a central annular structure and circular end members is held in assembled position by being placed between journal members of the frame of the device and in which a shaft is inserted 3,074,111 1 Patented Jan. 15, 1953 through such rotor and journal members for rotatably mounting such rotor in the frame.
  • Another object of the invention is to provide a turret device for electric circuits in which separate electric circuits including adjustable capacitors form part of a rotor and such adjustable capacitors are accessible for adjustment through the ends of the rotor.
  • a further object of the invention is to provide an improved adjustable capacitor structure particularly suitable for a turret device in which annular members of insulating material have axial extending bores circumferentially spaced therein and in which sleeves of conducting materials are positioned in such bores and plungers of conducting material are positioned in such sleeves and separated therefrom by a layer of insulating material and are adjustable axially of such sleeves.
  • FIG. 1 is a side elevation of the turret device of the present invention
  • FIG. 2 is a vertical transverse section taken on the line 2-2 of FIG. 1 showing the detent mechanism of the present invention
  • FIG. 3 is a fragmentary horizontal section taken on the line 303 of FIG. 1 showing the bearing structure and part of the detent structure at the detent end of the device;
  • FIG. 4 is a vertical transverse section taken on the line 4-4 of FIG. 1 showing the structure of the rotor and the central portion of the frame;
  • FIG. 5 is a fragmentary vertical transverse section taken on the line 55 of FIG. 1 showing rotor structure with the internal components of FIG. 4 omitted;
  • FIG. 6 is an axial section through an end member of the rotor of FIGS. 1 and 4;
  • FIG. 7 is a fragmentary radial section on an enlarged scale of the annular members of the rotor showing the adjustable capacitor structure of the present invention
  • FIG. 8 is a vertical section taken on the line 88 of FIG. 7 and showing one of the spring clips providing for axial adjustment of the plunger of the capacitor of FIG. 7 and providing for electrical connection to such capacitor;
  • FIG. 9 is a fragmentary section on an enlarged scale taken on the line 99 of FIG. 4 showing the details of a stationary contact.
  • FIG. 10 is a schematic diagram of a typical attenuator circuit which may form one of the circuits of the turret device of the present invention.
  • the device of the present invention includes a frame indicated generally at 20 in FIGS. 1 to 4, a rotor indicated generally at 22 in FIGS. 1 and 4, a detent structure indicated generally at 24 in FIGS. 1 to 3, an axially slidable shaft 26 shown in FIGS. 1 to 5 for supporting the rotor 22 in the frame 20 and a stationary contact structure 28 shown in FIGS. 1, 4 and 9.
  • the frame 20 is of U-shaped construction having a central portion 30 extending axially of the rotor 22 and spaced front and rear legs 32 and 34, respectively.
  • the front leg 32 is provided with a bearing member 36, shown most clearly in FIG. 3, for receiving the shaft 26, the bearing member being suitably secured in an aperture in the leg 32 by any suitable means, such as soldering or brazing.
  • the bearing member 36 has its end remote from the rotor 22 screw-threaded to provide for mounting the torrent device in an aperture in a panel 38 by means of a nut 40 screw-threaded on the bearing member. As shown in FIG.
  • the upper end of the leg 32 has an axially extending tab 42 extending into another aperture in the panel 38 to orient the turret device and prevent rotation of the frame 26 with respect to the panel 38.
  • the bearing member 36 has an axially extending sleeve portion 43 shown inFIG. 3, extending toward the rotor 22.
  • the sleeve portion 43 is received in a circular recess 44 in a detent wheel 46 forming part of the detent mechanism 24 so as to rotatively support the detent wheel.
  • the portion of the shaft 26 which extends through the bearing member 36 is circular but the remainder of the shaft 26 is flattened as shown most clearly in FIGS. 2 and 4.
  • the flattened portion of the shaft is received within a matching central opening 48 in the detent wheel 46- so that both the shaft 26 and the detent wheel 46 are rotatably supported by the bearing member 36 and the detent wheel 46 is constrained to turn with the shaft 26.
  • the detent mechanism 24- also includes a pivoted detent element 50 shown most clearly in FIGS. 1 and 2.
  • Such detent element has one end pivoted to the leg 32 of the frame 20 by a pivot 52' and has its other end urged toward the detent wheel 46 by a tension spring S i-connected between such other end and a tab 56 carried by the upper end of the leg 32 and extending axially toward the rotor 22.
  • the detent element 50 carries a roller 58 which is intermediate its ends positioned to engage in notches 60 in the periphery of the detent wheel 46. It will be apparent that the shaft 26 is selectively held in any one of a plurality of circumferentially spaced positions by the detent mechanism just described. 7
  • the rotor 22 includes an annular structure made up of two' annular end members 62 and 64 of insulating material held in axial alignment and spaced from each other by a central metal band 66 engagingin annular notches 68 and 70 in the outer peripheries of the adjacent edges of the end members 62 and 64, respectively.
  • the rotor 22 also includes a pair of similar circular end members 72 which are ofsomewhat greater diameter than the annular members 62 and 64 and which are provided with a plurality of spaced axially extending projections 74 which engage over the outer cylindrical surfaces ofthe annular members 62 adjacent their outer ends so as to hold the end members 72 in axial alignment with the annular members 62 and 64. As shown most clearly in FIG.
  • the annular members 62 and 64 are provided with a plurality of axially extending vcircumferentially spaced aligned bores 76, and also the end members 72 have axially extending bores 80 which may be aligned with the bores 76.
  • the ends of the annular members 62 and 64, which are remote from each other, are provided with a plurality of radially extending notches 82, as shown most clearly in FIG. 5, such notches each being aligned with and extending transversely across the end of one of the bores 76.
  • Alternate one of certain of the bores '76 in each of the annuuar members 62 and 64 are provided with an internal metallic sleeve 84.
  • the sleeves each have a cylindrical body fitting in one of the bores and have at one end a radially outwardly extending contact member 86 and a radially inwardly extending connecting and circuit component supporting element 88.
  • the contact elements .86 and connecting elements 88 are received in the radially extending notches 82 and at least the outwardly extending contact elements fit such notches.
  • the projections 74 on the end members 72 alternately engage the contact elements 86 so that the end members are restrained against rotation relative to the annular members 62 and 64.
  • the cylindrical sleeves 84 in alternate bores 76 in the annular members 62 or 64 each form part of an adjustable capacitor structure, including a metallic plunger 90 covered by a film or layer of insulating material 92' and received within each of the sleeves .84.
  • Each plunger 90 has an axially extending screw-threaded stem 94 of smaller diameter extending into and at least partially through an aligned bore 76 in the other annular member.
  • Each screw-threaded stem 94 is engaged by a U-shaped spring clip 96 extending radially of the rotor 22 and positioned in a radially extending bore in the annular member 62 or 64 as the case may be.
  • Such spring clips 96 engage the screw-threads upon the stems 94 of the plungers 9t) so that rotation of a plunger by means of screwdriver slots in the ends thereof axially adjusts such plunger in the associated sleeve 84, the ends of the plunger being accessible through the bore 83 in the end members 72.
  • the spring members 96 also constitute connecting and circuit component supporting members, for example, as illustrated in FIG. 7, a resistor 98 may be connected between the inner radial extremity of a spring clip 96 and a connecting element 88' forming part of a metallic sleeve 84 and as also illustrated in FIG. 7, the outer radial extremity of a spring clip 96 may be soldered to the central metal band 66 of the rotor structure 72 by a soldered connection indicated at 100 in FIG. 7.
  • the adjustable capacitors will be arranged alternately in reverse directions in the two annular members 62 and 64. That is to say, one adjustable capacitor will have its sleeve and plunger in a bore 76 in an annular member 62 and the next ci-rcumferentially spaced adjusttable capacitor will have its plunger and sleeve in a bore 76 in the annular member 64.
  • the spring clips96 extending through the annular members 76 will, in general, all have their outer radial extremities soldered to the metal band 66 as indicated at 100 in both FIGS. 7 and 1, while, in general, the springclips 96 extending through the annular members 62 will be axially spaced from the metal ring 66.
  • adjustable capacitors having their plungers and sleeves in the annular member 64 will not be'directly connected to the metal band 66 but those having their plungers 90 and sleeves 84 in the annular members 62 will be directly connected to such metal band.
  • the metal band may for certain of the circuits have additional fixed capacitors 102 (FIG. 4) of the wafer type inserted therein and connected to an adjustable capacitor and to such metal band and for the same or other circuits fixed capacitors 104 may be positioned within the interior of the rotor 22.
  • the metal band 66 may constitute a common or grounding connection and for this purpose, the central portion 30 of the frame has a plurality of spring brush elements 106 suitably secured thereto.
  • the brush ele- .ments-ll6 have free ends in contact with a portion of the metallic band 66 opposite the soldered connections 1% and nearest the detent end of the device.
  • the stationary structure 28 includes a plate 168 of insulating material secured to the central portion Bit of the frame 20 and extending substantially tangentially of the rotor22 but spaced radially therefrom.
  • the plate 108 may carry a pair of contacting engaging elements 116 constituting stationary contacts, one of such stationary contacts being in alignment with the radially extending contact elements 86 carried by the sleeves 84 in the annular member 62 and the other stationary contact element 110- being in alignment with the radially extending contact elements 86 carried by the sleeves 84 in the annular member 64.
  • the various contact elements 86 engage the stationary contacts 110 and such stationary contacts 11%) are so positioned that a contact element 86 of the rotor is in contact with each of the stationary contacts 116 in any operative angular position of the rotor.
  • An electric circuit is connected between the two contact elements 86 in engagement with tha stationary contacts 110 and such electric circuit may also include a connection to the band 66.
  • the present turret device was developed to provide an improved step attenuator for. the input circuit of an oscilloscope and a typical attenuator circuit for a high quality oscilloscope having frequency compensation is illustrated in'FIG. 10.
  • the two adjustable capacitors shown therein may be of the type having the sleeve 84 and adjustable plunger 90 therein, while the resistors may be resistors 98 positioned in the interior of the rotor and the fixed capacitor may be either one of the wafer capacitors 1%2 or a capacitor 104 positioned within the interior of the rotor.
  • the two contact elements 86 are indiacted as arrow points in the circuit of FIG. and the ground connection of such circuit may be made through the metallic ring 66.
  • the end members 72 are provided with flattened central openings 112 (FIG. 6) receiving the flattened portion of the shaft 26 so that the rotor 22 is constrained to turn with the shaft 26.
  • Such end members 72 have axially projecting hub members 114 of which one engages the leg 34- of frame 29 and the other engages the hub of the detent wheel 46.
  • Such hub of the detent wheel in turn engages the bearing member 36 carried by the leg 32 of the frame 2t).
  • the engagement of the hub members 114 with the leg 34 and the detent wheel 46 retains the end members 72 of the rotor in position relative to the annular members 62 and 64 and also retains the annular members 62 and 64 in engagement with the metallic ring 66 so that rotor 22 is maintained in assembled relation by the frame 29.
  • the shaft 26 may, however, be pulled completely out of the turret device by grasping the knob 116 thereon to free the rotor 22.
  • the rotor may then be slipped transversely of the device away from the brush elements 166 and stationary contact elements 110. This frees the rotor from the frame and the end members 72 may then be removed from the annular structure to expose the annular members 62 and 70 so that the circuit components associated with the rotor are accessible forinspection or replacement.
  • the motor 22 may be again placed into position in the'frame 2t and the shaft 26 reinserted.
  • the adjustable capacitors made up of the sleeves 84 in the bores 76 and the plungers 9t covered with a layer of insulating material, are accessible from either end of the turret when the turret is assembled and is either in position in the frame or is out of the frame.
  • a turret device for electric circuits comprising a rotor including an annular structure, circular end members closing the ends of said structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means to provide for removing said rotor from said frame, said journal means holding said'end members against axial movement away from said annular structure when said rotor is in position between said journal members, said device including a shaft slidably axially through said bearing means and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end members of said rotor, a plurality of circuit components positioned in the interior of said annular structure and connected to form a plurality of electric circuits, rotor contacts carried by said
  • a turret device for electric circuits comprising a rotor including an annular structure, circular end members closing the ends of said annular structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means and provide for removing said rotor from said frame, said journal means holding said end members against axial movement away from said annular structure when said rotor is in position between said journal means, a detent mechanism including a detent wheel carried by said frame adjacent one end of said rotor, said device including a shaft slidably axially through said bearing means and through said detent wheel and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end members of said rotor and in said detent wheel,
  • a turret device for electric circuits comprising a ro' tor including an annular structure, circular end members closing the ends of said structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means and for removing said rotor from said frame, said journal means holding said end members against axial movement away from said annular structure when said rotor is in position between said journal members, said device including a shaft slidab-ly axially through said bearing means and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end member of said rotor, a plurality of circuit components positioned in the interior of said annular structure, said annular structure having a plurality of circumferentially spaced
  • a turret device for electric circuits comprising a rotor including an annular structure and circular end mem bers closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conducting material in one of said bores and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means accessible through said end members for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitors to provide a plurality of separate electric circuits, means to index said rotor to selected positions, fixed contacts carried by said
  • a turret device for electric circuits comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conducting material in one of said bores and a plunger of conducting material in said sleeve separated from said sleeve by a layer of insulating material, said plunger being movable axially of said sleeve, adjustable means for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitor-s to provide a plurality of separate electric circuits, means a to index said rotor to selected positions, fixed contacts carried by said frame, and contacts carried by said
  • a turret device for electric circuits comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a pair of annular elements of insulating material axially spaced from each other and each having a plurality of circumferentially spaced axially extendng bores adjacent the periphery of said rotor, an external band of conducting material extending between said annular elements and connecting said annular elemets together, said bores in said annular elements being axially aligned with each other, a plurality of adjustable capacitors each includinga sleeve of conducting material in a bore in one of said annular elements and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means in an aligned bore in the
  • a turret attenuator comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to 'said vframe means about theaxis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conduct ing material in one of said bores and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitors to provide a plurality of separate attenuation circuits, means to index said rotor to selected positions, fixed contacts carried by said frame
  • a turret device for electric circuits comprising a rotor element of insulating material having an axially extending bore therein radially spaced from the axis of said rotor element, a sleeve of conducting material in said bore and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, and screw-threaded means for axially adjusting said plunger relative to said sleeve in order to vary the capacitance of the adjustable capacitor formed 'by said sleeve, said layer, and said plunger.
  • a turret device for electric circuits comprising a rotor element of insulating material having a plurality of axially extending bores therein radially spaced from the axis of said rotor element, a sleeve of conducting mate- 'rial in each of said bores and a plunger of conducting material and a layer of insulating material in each of said sleeves, said plungers being movable axially of said sleeves and each being separated from its respective sleeve by one of said layers of insulating material, and adjustable means for axially moving each of said plungers relative to its respective sleeve in order to vary the capacitance of the adjustable capacitor formed by said sleeve, said layer, and said plunger.
  • annular body of insulating material having a plurality of axially extending bores therein which are positioned radially from the axis of said body and circumferentially spaced from each other,
  • a plunger rod of conducting material mounted in each of said sleeves for axial movement with respect to said sleeves
  • each of said plunger rods axially relative to the sleeve within which it is mounted to vary thecapacitance of said variable capacitors.

Description

Jan. 15, 1963 L. c. HEDRICK TURRET DEVICE FOR ELECTRIC CIRCUITS Filed Oct. 20, 1958 INVENTOR. LANGDON C-HEDRICK BY BUCKHORN, CHEATHAM & BLORE ATTORNEKY FIG.3
United States Patent 3,074,011 TURRET DEVICE FOR ELECTRIC CIRCUITS Langdon C. Hfilllfik, Portland, 0reg., assignor to Tel:- tronix, 1116., Portland, 0reg., a corporation of Oregon Filed Oct. 20, 1958, Ser- No. 768,191 Claims. (Cl. 323-44) This invention relates to a turret device for electric circuits and more particularly to a device in which the components of a plurality of separate electric circuits are carried by a rotor in a manner which enables the rotor to be indexed to selectively connect any one of such circuits into an external circuit and in which the rotor is easily removed and disassembled for inspection or repair.
In accordance with the present invention, the rotor of the turret device is made up of an annular central structure and a pair of circular end members. The annular structure has axially extending bores or apertures containing circuit components and provides a hollow interior for the reception of additional circuit components. In the preferred construction, the rotor is slidable laterally of its central axis into position between journal elements forming part of a stationary frame. The journal elements hold the various parts of the rotor in assembled position by preventing axial separation of the end members.
The frame also carries a detent mechanism adjacent one end of the rotor and separate therefrom and a rotor shaft is rot-atively received'in the journal elements of the frame but is nonrotatively received in the end members of the rotor and also in the detent mechanism. The shaft, however, is slidable axially of itself in the journal elements and also in the end members of the rotor and in the detent mechanism so as to be removable from the frame and rotor by a movement axially of the shaft. The annular structure carries a plurality of circumferentially spaced contacts which selectively engage stationary contacts carried by the frame for connecting the individual electric circuits, such as attenuator circuits, into an external circuit. The stationary contacts are all on one side of the rotor so that the rotor may be removed from the frame by a motion laterally of its axis away from such contacts after the shaft has been removed by a motion axially of such shaft.
The specific construction of the annular structure disclosed herein includes annular portions having a plurality of circumferentially spaced axial extending bores, certain of which contain adjustable capacitors each including a cylindrical sleeve of conducting material and a plunger of conducting material separated from the sleeve by a layer of insulating material. Provision is made for ad justing the plungers axially of the sleeves and holding such plungers in adjusted position. In the specific embodiment shown, the sleeves referred to have radially extending portions at one end thereof which provide the contacts on the rotor above referred to, and which also provide connecting elements for circuit components positioned within the rotor. The adjusting mechanism for the plungers preferably include spring elements engaging screw threads upon plunger stems of reduced diameter, the spring elements also being employed for making connections to other circuit components.
It is therefore an object of the present invention to provide an improved turret device for electric circuits in which a rotor forming a part thereof can be easily removed and disassembled for inspection and service and as easily reassembled and reinstalled.
Another object of the invention is to provide a turret device in which a rotor made up of a central annular structure and circular end members is held in assembled position by being placed between journal members of the frame of the device and in which a shaft is inserted 3,074,111 1 Patented Jan. 15, 1953 through such rotor and journal members for rotatably mounting such rotor in the frame.
Another object of the invention is to provide a turret device for electric circuits in which separate electric circuits including adjustable capacitors form part of a rotor and such adjustable capacitors are accessible for adjustment through the ends of the rotor.
A further object of the invention is to provide an improved adjustable capacitor structure particularly suitable for a turret device in which annular members of insulating material have axial extending bores circumferentially spaced therein and in which sleeves of conducting materials are positioned in such bores and plungers of conducting material are positioned in such sleeves and separated therefrom by a layer of insulating material and are adjustable axially of such sleeves.
Other objects and advantages of the invention will appear in the following description of a preferred embodiment of the invention given in connection with the attached drawing of which:
FIG. 1 is a side elevation of the turret device of the present invention;
FIG. 2 is a vertical transverse section taken on the line 2-2 of FIG. 1 showing the detent mechanism of the present invention;
FIG. 3 is a fragmentary horizontal section taken on the line 303 of FIG. 1 showing the bearing structure and part of the detent structure at the detent end of the device;
FIG. 4 is a vertical transverse section taken on the line 4-4 of FIG. 1 showing the structure of the rotor and the central portion of the frame;
FIG. 5 is a fragmentary vertical transverse section taken on the line 55 of FIG. 1 showing rotor structure with the internal components of FIG. 4 omitted;
FIG. 6 is an axial section through an end member of the rotor of FIGS. 1 and 4;
FIG. 7 is a fragmentary radial section on an enlarged scale of the annular members of the rotor showing the adjustable capacitor structure of the present invention;
FIG. 8 is a vertical section taken on the line 88 of FIG. 7 and showing one of the spring clips providing for axial adjustment of the plunger of the capacitor of FIG. 7 and providing for electrical connection to such capacitor;
FIG. 9 is a fragmentary section on an enlarged scale taken on the line 99 of FIG. 4 showing the details of a stationary contact; and
FIG. 10 is a schematic diagram of a typical attenuator circuit which may form one of the circuits of the turret device of the present invention.
Referring more particularly to the drawings, the device of the present invention includes a frame indicated generally at 20 in FIGS. 1 to 4, a rotor indicated generally at 22 in FIGS. 1 and 4, a detent structure indicated generally at 24 in FIGS. 1 to 3, an axially slidable shaft 26 shown in FIGS. 1 to 5 for supporting the rotor 22 in the frame 20 and a stationary contact structure 28 shown in FIGS. 1, 4 and 9.
The frame 20 is of U-shaped construction having a central portion 30 extending axially of the rotor 22 and spaced front and rear legs 32 and 34, respectively. The front leg 32 is provided with a bearing member 36, shown most clearly in FIG. 3, for receiving the shaft 26, the bearing member being suitably secured in an aperture in the leg 32 by any suitable means, such as soldering or brazing. The bearing member 36 has its end remote from the rotor 22 screw-threaded to provide for mounting the torrent device in an aperture in a panel 38 by means of a nut 40 screw-threaded on the bearing member. As shown in FIG. 1, the upper end of the leg 32 has an axially extending tab 42 extending into another aperture in the panel 38 to orient the turret device and prevent rotation of the frame 26 with respect to the panel 38. The bearing member 36 has an axially extending sleeve portion 43 shown inFIG. 3, extending toward the rotor 22. The sleeve portion 43 is received in a circular recess 44 in a detent wheel 46 forming part of the detent mechanism 24 so as to rotatively support the detent wheel. The portion of the shaft 26 which extends through the bearing member 36 is circular but the remainder of the shaft 26 is flattened as shown most clearly in FIGS. 2 and 4. The flattened portion of the shaft is received within a matching central opening 48 in the detent wheel 46- so that both the shaft 26 and the detent wheel 46 are rotatably supported by the bearing member 36 and the detent wheel 46 is constrained to turn with the shaft 26.
The detent mechanism 24- also includes a pivoted detent element 50 shown most clearly in FIGS. 1 and 2. Such detent element has one end pivoted to the leg 32 of the frame 20 by a pivot 52' and has its other end urged toward the detent wheel 46 by a tension spring S i-connected between such other end and a tab 56 carried by the upper end of the leg 32 and extending axially toward the rotor 22. The detent element 50 carries a roller 58 which is intermediate its ends positioned to engage in notches 60 in the periphery of the detent wheel 46. It will be apparent that the shaft 26 is selectively held in any one of a plurality of circumferentially spaced positions by the detent mechanism just described. 7
The rotor 22 includes an annular structure made up of two' annular end members 62 and 64 of insulating material held in axial alignment and spaced from each other by a central metal band 66 engagingin annular notches 68 and 70 in the outer peripheries of the adjacent edges of the end members 62 and 64, respectively. The rotor 22 also includes a pair of similar circular end members 72 which are ofsomewhat greater diameter than the annular members 62 and 64 and which are provided with a plurality of spaced axially extending projections 74 which engage over the outer cylindrical surfaces ofthe annular members 62 adjacent their outer ends so as to hold the end members 72 in axial alignment with the annular members 62 and 64. As shown most clearly in FIG. 7, the annular members 62 and 64 are provided with a plurality of axially extending vcircumferentially spaced aligned bores 76, and also the end members 72 have axially extending bores 80 which may be aligned with the bores 76. The ends of the annular members 62 and 64, which are remote from each other, are provided with a plurality of radially extending notches 82, as shown most clearly in FIG. 5, such notches each being aligned with and extending transversely across the end of one of the bores 76. Alternate one of certain of the bores '76 in each of the annuuar members 62 and 64 are provided with an internal metallic sleeve 84. The sleeves each have a cylindrical body fitting in one of the bores and have at one end a radially outwardly extending contact member 86 and a radially inwardly extending connecting and circuit component supporting element 88. The contact elements .86 and connecting elements 88 are received in the radially extending notches 82 and at least the outwardly extending contact elements fit such notches. The projections 74 on the end members 72 alternately engage the contact elements 86 so that the end members are restrained against rotation relative to the annular members 62 and 64.
The cylindrical sleeves 84 in alternate bores 76 in the annular members 62 or 64 each form part of an adjustable capacitor structure, including a metallic plunger 90 covered by a film or layer of insulating material 92' and received within each of the sleeves .84. Each plunger 90 has an axially extending screw-threaded stem 94 of smaller diameter extending into and at least partially through an aligned bore 76 in the other annular member. 'Each screw-threaded stem 94, as shown most clearly in PIGS. 7 and 8, is engaged by a U-shaped spring clip 96 extending radially of the rotor 22 and positioned in a radially extending bore in the annular member 62 or 64 as the case may be. Such spring clips 96 engage the screw-threads upon the stems 94 of the plungers 9t) so that rotation of a plunger by means of screwdriver slots in the ends thereof axially adjusts such plunger in the associated sleeve 84, the ends of the plunger being accessible through the bore 83 in the end members 72. The spring members 96 also constitute connecting and circuit component supporting members, for example, as illustrated in FIG. 7, a resistor 98 may be connected between the inner radial extremity of a spring clip 96 and a connecting element 88' forming part of a metallic sleeve 84 and as also illustrated in FIG. 7, the outer radial extremity of a spring clip 96 may be soldered to the central metal band 66 of the rotor structure 72 by a soldered connection indicated at 100 in FIG. 7.
In general, the adjustable capacitors will be arranged alternately in reverse directions in the two annular members 62 and 64. That is to say, one adjustable capacitor will have its sleeve and plunger in a bore 76 in an annular member 62 and the next ci-rcumferentially spaced adjusttable capacitor will have its plunger and sleeve in a bore 76 in the annular member 64. The spring clips96 extending through the annular members 76 will, in general, all have their outer radial extremities soldered to the metal band 66 as indicated at 100 in both FIGS. 7 and 1, while, in general, the springclips 96 extending through the annular members 62 will be axially spaced from the metal ring 66. With this arrangement, adjustable capacitors having their plungers and sleeves in the annular member 64 will not be'directly connected to the metal band 66 but those having their plungers 90 and sleeves 84 in the annular members 62 will be directly connected to such metal band. The metal band may for certain of the circuits have additional fixed capacitors 102 (FIG. 4) of the wafer type inserted therein and connected to an adjustable capacitor and to such metal band and for the same or other circuits fixed capacitors 104 may be positioned within the interior of the rotor 22.
The metal band 66 may constitute a common or grounding connection and for this purpose, the central portion 30 of the frame has a plurality of spring brush elements 106 suitably secured thereto. The brush ele- .ments-ll6 have free ends in contact with a portion of the metallic band 66 opposite the soldered connections 1% and nearest the detent end of the device. The stationary structure 28 includes a plate 168 of insulating material secured to the central portion Bit of the frame 20 and extending substantially tangentially of the rotor22 but spaced radially therefrom. The plate 108 may carry a pair of contacting engaging elements 116 constituting stationary contacts, one of such stationary contacts being in alignment with the radially extending contact elements 86 carried by the sleeves 84 in the annular member 62 and the other stationary contact element 110- being in alignment with the radially extending contact elements 86 carried by the sleeves 84 in the annular member 64. Upon rotation of the rotor 22, the various contact elements 86 engage the stationary contacts 110 and such stationary contacts 11%) are so positioned that a contact element 86 of the rotor is in contact with each of the stationary contacts 116 in any operative angular position of the rotor. An electric circuit is connected between the two contact elements 86 in engagement with tha stationary contacts 110 and such electric circuit may also include a connection to the band 66. The present turret device was developed to provide an improved step attenuator for. the input circuit of an oscilloscope and a typical attenuator circuit for a high quality oscilloscope having frequency compensation is illustrated in'FIG. 10. The two adjustable capacitors shown therein may be of the type having the sleeve 84 and adjustable plunger 90 therein, while the resistors may be resistors 98 positioned in the interior of the rotor and the fixed capacitor may be either one of the wafer capacitors 1%2 or a capacitor 104 positioned within the interior of the rotor. The two contact elements 86 are indiacted as arrow points in the circuit of FIG. and the ground connection of such circuit may be made through the metallic ring 66.
The end members 72 are provided with flattened central openings 112 (FIG. 6) receiving the flattened portion of the shaft 26 so that the rotor 22 is constrained to turn with the shaft 26. Such end members 72 have axially projecting hub members 114 of which one engages the leg 34- of frame 29 and the other engages the hub of the detent wheel 46. Such hub of the detent wheel in turn engages the bearing member 36 carried by the leg 32 of the frame 2t). The engagement of the hub members 114 with the leg 34 and the detent wheel 46 retains the end members 72 of the rotor in position relative to the annular members 62 and 64 and also retains the annular members 62 and 64 in engagement with the metallic ring 66 so that rotor 22 is maintained in assembled relation by the frame 29. The shaft 26 may, however, be pulled completely out of the turret device by grasping the knob 116 thereon to free the rotor 22. The rotor may then be slipped transversely of the device away from the brush elements 166 and stationary contact elements 110. This frees the rotor from the frame and the end members 72 may then be removed from the annular structure to expose the annular members 62 and 70 so that the circuit components associated with the rotor are accessible forinspection or replacement. Upon replacement of the end members in proper position with respect to the annular members 62 and 64, the motor 22 may be again placed into position in the'frame 2t and the shaft 26 reinserted. It will be apparent that the removing and replacing of the rotor 22 does not disturb the detent mechanism 24, since the detent wheel 46 remains in position on the bearing member 36 attached to the frame. The adjustable capacitors made up of the sleeves 84 in the bores 76 and the plungers 9t covered with a layer of insulating material, are accessible from either end of the turret when the turret is assembled and is either in position in the frame or is out of the frame.
While I have described a preferred embodiment of my invention, it is understood that the details thereof may be varied and that the scope of the invention is to be determined by the following claims.
I claim:
V 1. A turret device for electric circuits comprising a rotor including an annular structure, circular end members closing the ends of said structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means to provide for removing said rotor from said frame, said journal means holding said'end members against axial movement away from said annular structure when said rotor is in position between said journal members, said device including a shaft slidably axially through said bearing means and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end members of said rotor, a plurality of circuit components positioned in the interior of said annular structure and connected to form a plurality of electric circuits, rotor contacts carried by said annular structure for each of said circuits and circumferentially spaced around said annular structure, stationary contacts carried by said frame for engagement by said rotor contacts to provide external connections for said circuits, said stationary contacts being positioned on one side of said rotor so that said rotor can be removed from and reinserted into said frame when said shaft is removed from said frame and so that said circuit components are accessible upon removal of said end members from said annular structure.
2. A turret device for electric circuits comprising a rotor including an annular structure, circular end members closing the ends of said annular structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means and provide for removing said rotor from said frame, said journal means holding said end members against axial movement away from said annular structure when said rotor is in position between said journal means, a detent mechanism including a detent wheel carried by said frame adjacent one end of said rotor, said device including a shaft slidably axially through said bearing means and through said detent wheel and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end members of said rotor and in said detent wheel, a plurality of circuit components positioned in the interior of said annular structure and connected into a plurality of separate electric circuits, rotor contacts carried by said annular structure for each of said circuits and circumferentially spaced around said annular structure, stationary contacts carried by said frame for engagement by said rotor contacts to provide external connections for said circuits, said stationary contacts being positioned on one side of said rotor so that said rotor can be removed from and reinserted into said frame separately from said detent mechanism when said shaft is removed from said frame and so that said circuit components are accessible upon removal of said end members from said annular structure.
3. A turret device for electric circuits comprising a ro' tor including an annular structure, circular end members closing the ends of said structure, and frame means including journal means adjacent each end of said rotor for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said rotor being slidable laterally of said axis in said frame to provide for moving said rotor into position between said journal means and for removing said rotor from said frame, said journal means holding said end members against axial movement away from said annular structure when said rotor is in position between said journal members, said device including a shaft slidab-ly axially through said bearing means and said rotor to provide for removing said shaft from and reinserting said shaft into said device, said shaft being rotatable in said journal means and nonrotatively received in said end member of said rotor, a plurality of circuit components positioned in the interior of said annular structure, said annular structure having a plurality of circumferentially spaced axially extending bores therein containing adjustable capacitors, said capacitors and said components being connected in a plurality of separate electric circuits, rotor contacts carried by said annular structure for each of said circuits and circumferentially spaced around said annular structure, stationary contacts carried by said frame for engagement by said rotor contacts to provide external connections for said circuits, said stationary contacts being positioned on one side of said rotor so that said rotor can be removed from and reinserted in said frame when said shaft is removed from said frame and so that said circuit components are accessible upon removal of said end members from said annular structure.
4. A turret device for electric circuits comprising a rotor including an annular structure and circular end mem bers closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conducting material in one of said bores and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means accessible through said end members for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitors to provide a plurality of separate electric circuits, means to index said rotor to selected positions, fixed contacts carried by said frame, and rotor contacts carried by said sleeves and extending radially outwardly of said rotor, said rotor contacts being circumferentially spaced around said rotor for engaging said fixed contacts to provide external connections for one of said circuits in each of said positions.
5. A turret device for electric circuits comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conducting material in one of said bores and a plunger of conducting material in said sleeve separated from said sleeve by a layer of insulating material, said plunger being movable axially of said sleeve, adjustable means for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitor-s to provide a plurality of separate electric circuits, means a to index said rotor to selected positions, fixed contacts carried by said frame, and contacts carried by said rotor and circumferentially spaced around said rotor for engaging saidfixed contacts to provide external connections for one of said circuit-s in each of said positions.
6. A turret device for electric circuits comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to said frame means about the axis of said rotor, said structure including a pair of annular elements of insulating material axially spaced from each other and each having a plurality of circumferentially spaced axially extendng bores adjacent the periphery of said rotor, an external band of conducting material extending between said annular elements and connecting said annular elemets together, said bores in said annular elements being axially aligned with each other, a plurality of adjustable capacitors each includinga sleeve of conducting material in a bore in one of said annular elements and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means in an aligned bore in the other of said annular elements for axially adjusting each of said plungers, fixed capacitors and resistors positioned Within said structure and connected with said adjustable capacitors to provide a plurality of separate electric circuits, means to index said rotor to selected positions, fixed contacts carried'by said frame, contacts carried by said rotor and circumferentially spaced around said rotor for engaging said fixed contacts to provide external connections for one of said circuits in each of said positions, and a contact carried by said frame and engaging said band to provide another external connection for said circuits.
7. A turret attenuator comprising a rotor including an annular structure and circular end members closing the ends of said structure, frame means including journal means for mounting said rotor for rotation relative to 'said vframe means about theaxis of said rotor, said structure including a portion of insulating material having a plurality of circumferentially spaced axially extending bores adjacent the periphery of said rotor, a plurality of adjustable capacitors each including a sleeve of conduct ing material in one of said bores and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, adjustable means for axially adjusting each of said plungers, fixed capacitors and resistors positioned within said structure and connected with said adjustable capacitors to provide a plurality of separate attenuation circuits, means to index said rotor to selected positions, fixed contacts carried by said frame, and contacts carried by said sleeves and extending radially from said rotor, said rotor contacts being circumferentially spaced around said rotor for engaging said fixed contacts to provide external connections for one of said circuits in each of said positions.
8. A turret device for electric circuits comprising a rotor element of insulating material having an axially extending bore therein radially spaced from the axis of said rotor element, a sleeve of conducting material in said bore and a plunger of conducting material in said sleeve, said plunger being movable axially of said sleeve and being separated from said sleeve by a layer of insulating material, and screw-threaded means for axially adjusting said plunger relative to said sleeve in order to vary the capacitance of the adjustable capacitor formed 'by said sleeve, said layer, and said plunger.
9. A turret device for electric circuits comprising a rotor element of insulating material having a plurality of axially extending bores therein radially spaced from the axis of said rotor element, a sleeve of conducting mate- 'rial in each of said bores and a plunger of conducting material and a layer of insulating material in each of said sleeves, said plungers being movable axially of said sleeves and each being separated from its respective sleeve by one of said layers of insulating material, and adjustable means for axially moving each of said plungers relative to its respective sleeve in order to vary the capacitance of the adjustable capacitor formed by said sleeve, said layer, and said plunger.
'10. A switch member containing a plurality of variable capacitors for connection into an electrical circuit at different times according to the position of said member with respect to the contact terminals of said circuit, comprising:
an annular body of insulating material having a plurality of axially extending bores therein which are positioned radially from the axis of said body and circumferentially spaced from each other,
a plurality of sleeves of conducting material positioned in said bores and having switch contacts connected thereto,
a plunger rod of conducting material mounted in each of said sleeves for axial movement with respect to said sleeves,
a layer of insulating ma'terial'positioned between each of said sleeves and the portion of each of said plunger rods which moves within said sleeves to form a plurality of variable capacitors with said rods and said sleeves, and
means for moving each of said plunger rods axially relative to the sleeve within which it is mounted to vary thecapacitance of said variable capacitors.
References Cited in the file of this patent UNITED STATES PATENTS 1,324,792 Booth Dec. 16, 1919 2,430,488 Wilhelm Nov. 11, 1947 2,595,194 Heibell Apr. 29, 1952 2,607,826 Barnes Aug. 19, 1952 2,786,976 Roemer Mar. 26, 1957 2,954,518 Dugot Sept. 27, 1960

Claims (1)

1. A TURRET DEVICE FOR ELECTRIC CIRCUITS COMPRISING A ROTOR INCLUDING AN ANNULAR STRUCTURE, CIRCULAR END MEMBERS CLOSING THE ENDS OF SAID STRUCTURE, AND FRAME MEANS INCLUDING JOURNALS MEANS ADJACENT EACH END OF SAID ROTOR FOR MOUNTING SAID ROTOR FOR ROTATION RELATIVE TO SAID FRAME MEANS ABOUT THE AXIS OF SAID ROTOR, SAID ROTOR BEING SLIDABLE LATERALLY OF SAID AXIS IN SAID FRAME TO PROVIDE FOR MOVING SAID ROTOR INTO POSITION BETWEEN SAID JOURNAL MEANS TO PROVIDE FOR REMOVING SAID ROTOR FROM SAID FRAME, SAID JOURNAL MEANS HOLDING SAID END MEMBERS AGAINST AXIAL MOVEMENT AWAY FROM SAID ANNULAR STRUCTURE WHEN SAID ROTOR IS IN POSITION BETWEEN SAID JOURNAL MEMBERS, SAID DEVICE INCLUDING A SHAFT SLIDABLY AXIALLY THROUGH SAID BEARING MEANS AND SAID ROTOR TO PROVIDE FOR REMOVING SAID SHAFT FROM AND REINSERTING SAID SHAFT INTO SAID DEVICE, SAID SHAFT BEING ROTATABLE IN SAID JOURNAL MEANS AND NONROTATIVELY RECEIVED IN SAID END MEMBERS OF SAID ROTOR, A PLURALITY OF CIRCUIT COMPONENTS POSITIONED IN THE INTERIOR OF SAID ANNULAR STRUCTURE AND CONNECTED TO FORM A PLURALITY OF ELECTRIC CIRCUITS, ROTOR CONTACTS CARRIED BY SAID ANNULAR STRUCTURE FOR EACH OF SAID CIRCUITS AND CIRCUMFERENTIALLY SPACED AROUND SAID ANNULAR STRUCTURE, STATIONARY CONTACTS CARRIED BY SAID FRAME FOR ENGAGEMENT BY SAID ROTOR CONTACTS TO PROVIDE EXTERNAL CONNECTIONS FOR SAID CIRCUITS, SAID STATIONARY CONTACTS BEING POSITIONED ON ONE SIDE OF SAID ROTOR SO THAT SAID ROTOR CAN BE REMOVED FROM AND REINSERTED INTO SAID FRAME WHEN SAID SHAFT IS REMOVED FROM SAID FRAME AND SO THAT SAID CIRCUIT COMPONENTS ARE ACCESSIBLE UPON REMOVAL OF SAID END MEMBERS FROM SAID ANNULAR STRUCTURE.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573682A (en) * 1968-04-04 1971-04-06 Zenith Radio Corp Step-by-step rotatable television tuner with open-center rotor assembly
US20160146682A1 (en) * 2014-11-25 2016-05-26 Hamilton Sundstrand Corporation Slip ring containment band

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US1324792A (en) * 1919-12-16 Apparatus unit
US2430488A (en) * 1943-09-02 1947-11-11 Bell Telephone Labor Inc Adjustable compensated standard
US2595194A (en) * 1950-03-18 1952-04-29 Erie Resistor Corp Variable condenser
US2607826A (en) * 1950-07-25 1952-08-19 Llewellyn T Barnes Trimmer capacitor
US2786976A (en) * 1952-07-24 1957-03-26 Bendix Aviat Corp Circuit component
US2954518A (en) * 1958-08-11 1960-09-27 Electrionic Insturment Co Inc Resistance-capacitance combination substitution instrument

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1324792A (en) * 1919-12-16 Apparatus unit
US2430488A (en) * 1943-09-02 1947-11-11 Bell Telephone Labor Inc Adjustable compensated standard
US2595194A (en) * 1950-03-18 1952-04-29 Erie Resistor Corp Variable condenser
US2607826A (en) * 1950-07-25 1952-08-19 Llewellyn T Barnes Trimmer capacitor
US2786976A (en) * 1952-07-24 1957-03-26 Bendix Aviat Corp Circuit component
US2954518A (en) * 1958-08-11 1960-09-27 Electrionic Insturment Co Inc Resistance-capacitance combination substitution instrument

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3573682A (en) * 1968-04-04 1971-04-06 Zenith Radio Corp Step-by-step rotatable television tuner with open-center rotor assembly
US20160146682A1 (en) * 2014-11-25 2016-05-26 Hamilton Sundstrand Corporation Slip ring containment band
US9528891B2 (en) * 2014-11-25 2016-12-27 Hamilton Sundstrand Corporation Slip ring containment band

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