US1241273A - Rotatable contact-breaker for magnetos and other purposes. - Google Patents

Description

E. 1. PILBLAD. v ROTATABLE CONTACT BREAKER FOR MAGNETOS AND OTHER PURPOSES. APPLICATION FILED MAR. 10. I917- 1,241,273. PatentedSept. 25,1917.

' 1 129.1 \\\\\\\g a H 5/ 1 $1 F A I K Q) B 2/ 6 "617165-563 Fa Men/07" UNITED STATES PATENT. oEEioE.

ERIC JULIUS PILBLAD, or EIcEs'rEE, ENGLAND, Ass'IGN'oE T0 IMPERIAL TYPE- JErrEEooMrAnY, LIMITED, 0E LEICESTER, ENGLAND.

ROTATABLE CONTACT-BREAKERronivmcnEros AND OTHER PURPOSES.

1,241, 2vii T0 aZZ w hU-m it may concern:

Be it known that 1, ERIC JULrus PILBLAD, a subject of the King of England, residing at Leicester, in England, have invented certain new and useful Improvements in Ro tatable Contact-Breakers for Magnetos and other Purposes, of which the following is a specification. 1

This invention relates to magneto con-' tact-breaker devices of the type wherein the contacts are carried on a rotating spindle and one contact is connected to the spindle by an arm which bears against a stationary cam whose operative face is shaped to move the arm axially relatively to the spindle to efiect the break in the circuit. It is a dis-. advantage o1, contact-breakers as at present commonly used, that the surfaces of the co'ntact-points are so difficult of access formspection, cleaning and adjustment; it is the prime object of the present invention to provide a construction of contact-breaker, such that the working surfaces of the contact-points shall be readily accessible for inspection etc.

According to the present invention, a magneto contact-breaker. device ofthe type described, is characterized by. having the arm which carries the movable contact so connected to the spindle that it can be readily moved from its operative position in such a manner as to carry.one contact away from in front of the; other to render both working faces of the contact readily visible and accessible. 1

Conveniently, according to this invention, the arm carrying the movable contact is hinged to a part connected with the spindle, and displaceable locking-means are provided for maintaining the arm in the operative position. The locking-means may take the form of a resilientfinger which normally constitutes the resilient control for the operative end of the arm, but which is pivotally mounted on the spindle so as to be movable about its pivot to a position where it permits the said operative end to be swung away from the cam.

One embodiment of the present invention is illustrated in the accompanying drawings in .which- Figure'l is a central vertical longitudinal Specification of Letters Patent. Patented Sept, 25, 191 Application filed March 10, 1917. Serial No. 153,919.

section of the complete magneto, but showing the contact-breaker device in elevation;

Fig. 2 is a longitudinal section on the line 2-2 of Fig. 3 to a larger scale. than that of Fig. 1 of the parts constituting the contact-breaker device and of some adjacent parts;

Fig. 8 is an end elevation of a detail, and

Fig. 4 is a side elevation ofthe parts shown in Fig. 3,.but with the movable concontact swu'ngaw ay for inspection.

The contact-breaker device comprises an inner contact-carrying disk A carried onfia tubular spindle B, keyed at B into the spindle O of the magneto armature. Mount ed upon the disk A, but electrically insir lated from it, is anxouter disk D which serves to carry the outer contact, not directly. but upon a hinged arm as hereinafter described. Thedi-sk D has two lugs D upturned from the general plane of the disk,

which support a pivot pin Upon the pivot pin E is mounted the arm which car rice the outer contact, this arm being in the form of a disk F that is centrally apertured and that is provided with three cam. Just at the base of the finger F is mounted the movable contact H which cooperates with the fixed contact H mounted upon the inner disk A. The aperture in the disk F is shaped in the manner clearly shown in Fig. 3 so as to clear a pillar D extending axially from the outer disk D.

Theaperture is, however, enlarged in the direction away from the finger F beyond the amount necessary to clear the pillar D for reasons which will hereinafter appear. The outer disk D is cut away along the line D as seen in Fig. 3, in order to clear the contact H A 'piece of plate-spring is provided to form a resilient finger J whose free endhas a slight projection J arranged to engage with a corresponding depression in the finger F. The other end of this finger is pierced to receive the pillar D and is riveted thereon, but so as to be free torotate upon the pillar about the axis of rotation of the spindle.

The cam of the device is seen at K and is formed of a ring of metal that is stamped to give the requisite cam-surface, as will readily be understood from the drawing.

The inner and outer disks A and D are socured to ether in any convenient manner and the who e device is mounted on the end of the s indle C by the aid of a single central bolt In, registering engagement being provided by the key B In normal operation the disks D and A and the .parts carried thereon rotate with thespindle C thus causing the wiper G to cooperate with the stationary cam K to separate the contacts H H periodically in the well-known manner, -the spring-finger J serving to keep thecontacts closed when the cam permits. It will be readily seen that.

the oscillationsof the arm F take place about the pivot in E.

If now it is esired to inspect or obtain access to the workin surfaces of the contacts H H the resihent finger J is swung around the illar D 'awayfrom the position shown in ig. 3 to the position shown in Fig. 4, whereupon .the whole arm F can be I swung about the pin E into the position shown inv Fig. 4 thus moving from its operative position and carrying the contact H away from in front of the contact H so that both working faces of the contact are readily visible and accessible. It will be seen froman inspection of Figs. 3 and 4 that the enlargement, above referred to, to the central aperture of the arm F- serves to acoommodate the resilient finger J when the "arts'are moved into the'position shown in ig, 4.. The portions of the apparatus t0 the right of the inner disk A, as viewed in the drawings, do not constitute part of the I away from the other in a direction parallel to the said axis of rotation, means to connect the said moved member to the other said member so that the two rotate in unison but so that the said moved member is movable -..relatively to the other so as to carry the .contact upon it away from the other and expose the working faces ofboth the said consimultaneously to view and means normally to maintain. the said moved member and'whereof one is periodically moved to open the contacts by carrying one of them away from the other in a direction parallel to the said axis of rotation a hinge so to connect the said moved member to the other that the two rotate in unison but the said moved member is movable relatively to the other so as to carry the contact upon it away from the other and expose the working faces of both the said contacts simultaneously to view and means normally to maintain the said moved member in the operative position, substantially as set forth.

3. In a magneto contact-breaker, the combination of two-contact-carrying members simultaneouslyv rotatable about the same axis and whereof one is periodically moved to open the contacts by carrying one of them away from the other in a direction parallel to the said axis of rotation, a bin so to connect the said moved member to t e other that the two rotate in unison but the said moved member is movable relatively to the other so as to carry the contact upon it away from the other and expose the working faces of both the said contacts simultaneously to view and displaceable lockingmeans to maintain the said moved memberlogerative position, subthe other so as to carry the contact upon it away from the other and expose the working faces of both the said contacts simultaneously to view, and a resilient finger constituting the resilient control normally to hold the contacts closed supported from the said other member to be pivotally movable relatively. thereto about the said axis of r0- ration from its normal position to one in which it permits the said moved member to be swung away from the other about the said hinge, substantially as set forth.

5. In a magneto contact-breaker, the combination of twocontact-carrying members simultaneously rotatable about the same axis and whereof one is periodically moved to open the contacts by carrying one of them "away from the other in a direction parallel to the said axis of rotation, a hinge by which the said moved member is so connected to the l otheras to be movable aboutan axis transverse to' the axis of rotation, and an axial support connected to the said other member and extending through a clearance aperture in the said moved member and provided with a-resilient finger which normally bears upon the said moved member but is pivotally movable upon said support to free the moved 10 I copies of this patent may he obtained for five cents each, by addressing the commissioner of ratontl,

- Washington, D. 0.

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