US1605866A

US1605866A - hew yoek

Info

Publication number: US1605866A
Authority: US
Publication date: 1926-11-02
Anticipated expiration: 1943-11-02

Description

' Nov. 2 192e. 1,605,866

A. STGER COMBIHED Rm-:osim AND SWITCH Filed May 17, 1922 Patented Nov. 2, 1926.

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ANTON STC'ER, CF LONG SLILND O'L', YORK, AESGNGR 'IO AMERICAN MOTION :PICTURE MACE-ENE VJBKS, OF LONG ISLAND CTY, YORK, A FIRII COMPOSED OF ANTON EMND NISNEEVSKL v GOIVIBINED RHEOSTAT AND SWITCH.

Application led May 17,

The invention relates to resistance changing mechanisn'i` or rheostats, for example of "the type now extensively employed in connec-.tion with the control of the filament current of vacuum tubes used in radio communication. In such rheostats it is especially desirable to aEord means for rather line adjustment of the resistance, aswell as to provide for the cutting off entirely of the lamp current at certain times.

The present invention has for its object a rheostat wherein a micrometer adjustment of the resistance is afforded and wherein the current may beentirely cut off and in such manner, moreover, that upon restoring same, the exact resistance to which the rheostat was set at the time of disestablishment of `tue current will again be cut in when the current is reestabiishet. A further object of the invention consists in a rheostat of simple and rugged construction and which may be manufactured at comparatively low cost.

The nature of the invention, however, will "-5 best be understood when described in connection with the accompanying drawings, in whichv F ig. 1 is a front elevation of the improved rheostat.

Fig. 2 is an end View thereof.

Fig. 3 is a plan view.

Fig. 4. is a vertical section thru the rheostat.

Similar characters of reference designate corresponding parts t-hruout the several views.

Referring to the drawings, designates a suitable support or base having two

uprights

11 and 12 at its respective ends and within which is mounted for rotation a metallic shaft 13. This shaft is lprovided at one end with a knob 14 whereby said shaft may be conveniently rotated, and carries a drum 15 upon the periphery of which is wound a resistance wire 16 in the form of a helix of fine pitch. The one end of said coil is embedded in the drum and the other is electrically connected with the shaft 13 (as shown in F ig. 4t) and against one end of which shaft bears a spring 17 secured to the base and thru which electrical connection may be made to the rheostat.

1922. Serial No. 561,605.

A rod 2O is alsomounted in the

uprights

11 and 12 for oscillation therein, being provided at one end with a knob 21 to conveniently effect this oscillation; and its opposi-te end being squared and having bearing thereon a flat spring 22 serving to lock the rod indifferent positions as well as to connect same electrically to an external.

source of current supply (not shown).

A slider or brush 25 is carried by the rod 20, being in the `nature of a tube encircling same and having a spring tongue 26 bearing upon a portion of the surface of the rodl to resiliently hold the slider thereto. The slider carries also a brush portion having an edge 27 of thickness substantially equal to the spacing of the wire 16 of the helix and adapted to fit between two successive convolutions thereof and contacting simultaneously with both.V `It will be apparent that ifvthe drum 15 be rotated, as by turning knob 14, the slider 25 thru engageient of its edge 27 with the convolutions of '1 the wire coil 16 will be advanced or re tracted accordingly and will thus cut in or iii? out resistance as may be desired. It will be Y noted also that the change of resistance is continuous, that is to say in minute fractions of a turn and not in complete turns as is the usual practice where a brush moves over the surface of the turns. Thru the engagement of spring 22 with the squared enc of rod 20, the proper position of engagement of brush 27 and the heliX 16 will be insured and the brush edgeheld therein against lateral displacement d'uring rotation of the drum.

Furthermore, if it. be desired to tempo rarily cut off the supply of current, the same may readily be effect-.ed by turning the rod 2O thru the knob 21, as this will cause the edge 27 to swing out of engagement with the particular `pair of convolutions of the resistance wire and thus interrupt the circuit at this point. The relation of the edge 27 with respect to the resistance coil, however, is not disturbed thereby; and as soon as the rod 20 is turned back to cause engagement again between edge 27 and the coil, the exact amount of resistance to which the rheostat had previously been adjusted will be restored so that it is not necessary to further manipulate the rheostat aft-er the proper adjustment for the lamp has once been determined.

I claim 1. A rheostat, comprising a rotatable drum, a helix of resistance wire wound thereon, a rod parallelto the axis of the rotatable drum and oscillatable in a plane. at right angles thereto, a member mounted to slide freely on said rod and having an extension whose edge is adapted to fit between two successive convolutions the helix lto be advanced thereby in either direction asv the drumr` iscorrespondingly rotated andthereby to increaseor decrease the effective resistance of the helix, said slidaltly mounted member being movable into and out` of Contact With the helixby correspondingly turningsaid rod, and electrical connections to the helix and slider.

2. A- rheost-at, comprising a rotatable drum, a helix of resistance wire Wound thereon, an oscillatable rodsquared at one end, a knobat the otherv end thereof for oscillating the rod, a flat spring bearing against the vsquared end of said rod, and a= member slidably'mounted on the rodv and having anextension Whose edge is adapted to fit between and Contact with two successive convolutions of the helix.

3'. Ai rheostat, comprising av rotatable drum, a helix of resistance Wire Wound thereon, an oscillatable rod squared at one end, a knob at the other end thereof for oscillating the rod, a flat spring bearing against the squared end of. said rod, a member slidably mounted on the rod and-having an-extension Whose edgeis adapted to fit between and contact with two successive convolutions of the helix, and electrical connections to said helix and .saidlat spring.

4f. A rheostat, comprising a frame, a metallic shaft rotatably mounted therein and projecting at one end thru the frame, a knob secured to the other end for rotating said shaft', a brushfbearing against the projecting end of the, shaft for effecting electrical connection thereto, a drum mounted on the shaft, a helix of resistance wire wound Lon the periphery thereof, one rend be-v ingl connected to the. metallic shaft, a rod mounted to cscillate in said frame, one end projecting beyond: the frame and squared, a knobatuthe other end'for oscillating said rod, aflatspring bearing against the squared end of: the shaft andlthruewhich electrical connect-.ion may be made thereto, and a tube movabl'y mounted ontherod andhaving a spring.I tongue for. resilientlyv holding same thereto, said tube having also an extension whose edge is adapted to fit between and contactr with two successive; convolutons of the helix.

Signed at. Long Island Cityin the county oflQueens and State of'NeW Yorkvthis 13th day of May A. D. 1992.

ANTON STGER.