US2249479A - Stop means for rotary inductances - Google Patents

Description

Jul 15, 1941. E, A. LEACH 2,249,479

STOP MEANS FOR ROTARY INDUCTANCES Filed Nov. 28, 1959 v Inventor: Edward A,L..each,

, by flan/ 76i His Attor-fiey Patented this, 1941 UNITED STAT STOP S FOB ROTARY INDUCTANOES Edward A. Leach, Schenectady, N. Y., mignor to General Electric Company, a corporation of New York Application November as. 1939. Serial No. 306.567

6 Claims.

My'invention relates to devices, such as rotary inductance coils, which include a rotatably supported helical conductor or similar member and a traveling member or roller in contact with the helical member and movable thereby longitudinaily thereof as the helical member is rotated. The invention relates particularly to means for stopping the rotation of the helical member after a predetermined number of revolutions thereof.

The general object of the invention is to provide 'a simple and positive stop mechanism for the helical conductor member employed in rotary inductance coils'and the like.

A particular object is to provide a stop mechanism, for a rotatably supported helical conductor member, in which the traveling or roller contact member directly actuates a stop means associate with the helical member.

Another object is to provide an adjustment means, preferably associated with the traveling or roller member, whereby a final adjustment for stopping the helical member exactly in its predetermined desired position is readily obtained.

In the operation of rotary inductance coils and the like, having a traveler or roller in contact with a helix and moving from end to end thereof, difficulties have been encountered in the use of means to stop the helix as the roller approached an end, and to prevent the traveler or roller from running oil the end of the helix. In certain cases the stop means heretofore employed have involved objectionable complication, and uncertainty in operation. Further, diiilculties have been encountered in the final adjustment of the stop means.

In accordance with my present invention the foregoing and other difllculties are overcome, and the above-mentioned and further objects and advantages are attained by the provision of a means for stopping. therotation of the helical member including a stop member movable with or in mechanical connection with ,the helical member, a second stop member having one portion in the path of the traveling or roller memofa rotary inductance device in which my invention has been embodied; Fig. 2 is an elevational view, partially in section, of the embodiment illustrated in Fig. 1; Fig. 3 is an end elevational view, with one end plate broken away, of the embodiment illustrated in Figs. 1 and 2; and Fig. 4 is an enlarged sectional view of the traveling or roller contact member shown in Figs. 1 to 3.

Referring to Fig. 1, the numeral Hi designates a helical conductor wound on a cylindrical form i I ,rotatably mounted in a frame or support comprising a pair of end plates i2 and I3 and spacer rods ll. On a rod 15 parallel to the axis of coil in is mounted a traveling contact member or contact roller member it which rides on the helical conductor l0. To maintain the roller i6 infirm contact with the conductor l0, the rod i5 is resiliently mounted on the end plates i2, i3, by springs II which pass through the ends of the rod i5 and the ends of which rest against studs i8 fastened in the end plates. The ends of the rod it are provided with slots l9 and in the slow are mounted stop members 20 and 2| having cam portions 22 and 23. Springs 24 and 25 secured to the studs i8 are provided in contact with stop members 29 and 2| to maintain the latter members in position to be engaged by roller it.

To provides final adjustment of the stop means without the necessity of performing a. filing or similar operation on the co-acting stop members, the traveling member i6 is so arranged that the portion thereof which engages a stop 20 or M may be changed in shape, or lengthened or shortened preferably in the direction of translation of the member it along the helical member ill. I In the present embodiment of the invention the travcling member is constituted by a main or wheel portion 26 having preferably a threaded central bore 21, as shown in Fig. 4, and members movable axially in the bore, preferably bushings 28 and 29 screwed into the ends of the bore and provided with tapered ends 30 and 3!.

member, and means for adjusting a contact pornection with the accompanying drawing and its scope will be pointed out in the appended claims. Referring to the drawing, Fig. 1 is a plan view Referring now to Fig. 2, the stop members 20 and 2|, preferably bell-crank shaped and formed of sheet material, are pivoted, by pins 32, in the slots IQ of rod l5. Adjacent to the ends of the helical conductor l0, and on the inside of the form ii on which conductor I0 is wound, are mounted, as by screws 33, stop members 34 each having a lug portion 35 projecting outwardly of the coil form ll. Stop members 20 and 2i have arm portions. 36 and 81 adapted to be swung into the path of and to be engaged by the corresponding lug portions 35 of the coil form stop members ll.

In operation of the device, upon rotation of the coil form ll carrying the helical member ID, the roller 16 is translated in the usual manner along this member. As the roller nears an end of its travel it strikes the cam arm, as 22, of the corresponding bell-crank shaped stop member 20. The latter stop member is thereupon rotated on its pivot, as best shown at the left-hand end of Fig. 2, to move the other arm, 36, into the path of the lug portion 35 of the corresponding stop member 34 connected to coil form ll, thereby stopping the rotation of the helical member HI. The roller member bushing 2!, which makes contact with the cam portion 22 of the stop member 20, is adjusted with reference to the wheel portion 26 until the latter stop member 20 is engaged at exactly the proper time in the rotation of the helical member Ill. The foregoing operation is repeated for the stop means at the other end of the helical member Hi. The bushings 28 and 29 may then be soldered or otherwise secured permanently in place on the wheel portion 26.

My invention has been described herein in a particular embodiment for purposes of illustration. It is to be understood, however, that the invention is susceptible of various changes and modifications and that by the appended claims I intend to cover any such modifications as fall within the true spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In combination, a helical member, means to rotate said member, a traveling member in contact with said helical member and adapted to be moved thereby longitudinally thereof, and means to stop said helical member comprising a member arranged to rotate with said helical member and means actuated by said traveling member to engage said third-named member after a predetermined number of revolutions of member comprising a member arranged to rotate with said helical member, and means in the path of said roller to engage said second-named member after a predetermined number of revolut ons of said helical member.

3. In combination, a helical member, a support therefor, means to rotate said helical member, a traveling member in contact with said helical member and adapted to be moved thereby longitudinally thereof, means to stop said helical member after a predetermined number of revolutions thereof comprising a member arranged to rotate with said helical member, a member pivoted with respect to said support having a portion adapted to engage said third-named member and a second portion adapted to be engaged by a portion of said traveling member, and means to vary the length of said portion of said traveling member.

4. In combination, a rotatable helical member, a roller in contact with said member movable thereby longitudinally thereof, means to vary the axial length of said roller, and means actuated by said roller to stop said helical member in a predetermined position when said roller reaches a predetermined turn of said helical member.

5. In combination, a rotatable helical member, a roller in contact with said member movable thereby longitudinally thereof, a bushing in said roller adjustable axially thereof, and means to stop said helical member in a predetermined position, said means comprising a member having a portion in the path of said bushing and a portion adapted to be engaged by a member rigidly connected to said helical member.

6. In combination, a rotatable helical member, a roller in contact with said helical member movable thereby longitudinally thereof, an adjustable bushing in said roller, and means to stop said helical member comprising a member connected to said helical member and a bellcrank shaped member having one portion in the path of said bushing and another portion adapted to engage said second-named member.

EDWARD A. LEACH.

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