US796851A - Ruhmkorff coil. - Google Patents

Description

PATENTED AUG. 8, 1905.

J. MGINTYRE. RUHMKORFF COIL. APPLICATION FILED DBG. a, 1904.`

W/TNESSES: v M@ feg ATTOR/VE PATENT i OFFICE.

JOHN MGINTYRE, OF JERSEY CITY` NEW JERSEY. n

RUHMKOR'FF COIL.

To 1f/ZZ whom, it may concern.-

Be it known that I, JOHN MCINTYRE, a citizen of the United States, and a resident of Jersey City, in the county of Hudson and State of New Jersey, have invented a new and Improved Ruhmkor Coil, of which the following is a full, clear, and exact description.

The invention relates to Ruhmkorff coils for use in electromagnetic apparatus-such, for instance, as shown and described in the application for Letters Patent of the United States, Serial No. 230,485, iiled by me October 29, 1904.

The object of the invention is-to provide a new and improved Ruhmkorif coil arranged to allow continuous running of the apparatus without requiring retruing of the contact platinum portions and insuring a proper readjustment and contact between the said contact platinum portions without danger of quickly burning their registering faces.

The invention consists of novel features and parts and combinations of the same, as will be more fully described hereinafter and then pointed out in the claims.

A practical embodiment of the invention is represented in the accompanying drawings, forming a part of this specification, in which similar characters of rference indicate corresponding parts in all the views.

Figure l is a plan view of the improvement. Fig. 2 is a side elevation of the same. Fig. 3 is an enlarged cross-section of the same on the line 3 3 of Fig. 2. Fig. 4 is a perspective view of the improvement, and Fig. 5 is a perspective view of the non-rotatable slidable bar carrying one of the contact-plates.

On the base A of the apparatus is mounted the usual coil-cylinder B, carrying the primary and secondary wires, and the central core C, opposite the outer end of which is arranged the armature D on the free end of a spring armature-lever D, Xed at its other end in a suitable post E, carried by the base A. On the spring armature-lever D, between the armature D and the iiXed end, is held a contact platinum portion D2, as indicatedin the drawings. The contact platinum portion D2 is opposite a similar contact platinum portion F', fixed on one end of a bar F of square or other polygonal cross-section, or at least so constructed thatit cannot rotate, and itted to slide in a correspondingly-shaped bearing held on a post G, attached to the base A. A set-screw I-I, screwing in the post G against the bar F, Serves to lock the latter in place after the de- Specication of Letters Patent.

Application filed December 8, 1904.. Serial No. 236,024.

Patented Aug. 8, 1905.

sired adjustment is made. To bring the contact platinum portion F in proper relation to the armature-spring contact platinum portion D2, a spring I, secured at one end to the base A, presses with its free end against the knob F2 on the outer end of the bar F, so that when the screw H is loosened the spring I causes the bar F to slide toward the armature-spring D to bring the contact portion F' in proper relation to the contact portion D2. When this has been done, the set-screw H is screwed upl to fasten the bar F in the adjusted position.

In order to hold the armature-spring D temporarily in a fixed position while adjusting the bar F, a lever J is provided, fulcrumed on the face of the coil-cylinder B and adapted to be swung in position between the face of the cylinder B and the inner face of the armature D' of the armature-spring D, so as to prevent the said armature D from swinging toward the core C, and while the armature D', and consequently the armature-spring D, are held against a swinging motion in the direction described the bar F is adjusted, as above described, to bring the contact portion F in proper relation to the contact portion D2. Afi ter the bar F has been secured in place by screwing up the set-screw H then the operator swings the lever J into a normal inactive position, as indicated in dotted lines in Fig. 3-that is, out of engagement with the armature Dto allow the armature-spring to vibrate in the usual manner when the apparatus is in use.

It is understood that the apparatus is provided with the usual binding-posts and wire connections common to Ruhmkorif coils, and further description of the same is not deemed necessary. i

By the arrangement described the faces of the contact portions D2 and F always remain in the same straightline position to each other-that is, the contact portion F is not rotated when an adjustment is to be made, so as to prevent the face from changing its position relative to the face of the contact portion D2.

In Ruhmkorff coils as heretofore constructed the contact platinum portion F was usually on the end of a screw screwing in a post, and hence the contact portion was rotated while moving toward and from the other contact portion on the armature-spring. During this rotation the minute projections on the faces of the contact portions F and D2, ycaused by the spark of the previous operation of the apparatus, override each other and tend to be broken off, and consequently the two faces of the contact portions are injured and no longer true and cause a bad contact and excessivelydestructive sparking, thus requiring a frequent truing of the contact-faces and readj ustment of the screw to keep the apparatus running for any length of time. lVith the arrangement described the opposite faces remain in the same relative position to each other without danger of injuring the faces when making' the readjustment, and as the operator might not possess the mechanical ability to retrue the platinum faces the benefit of' the improvement may be more evident, and thus the apparatus can run as long and as well as in the first operation-say for forty-eight hours whereas the contacting faces after rotating and readjustment would not operate 'more than, say, six hours without a readjustment of the bar F, carrying the contact portion F. By the arrangement described the usual compulsory retruing of the contacting faces and consequent waste of these expensive platinum portions are entirely avoided.

It is understood that for electromagnetic apparatus such as referred to, in which a Ruhmkorff coil is an important element, it is desirable to uninterruptedly have the Ruhmkorff coil in action with the least necessity for readjustment, so as to produce the best results on the object under treatment.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A Ruhmkorff coil provided with a spring armature-lever carrying a contact portion, a bar arranged at an angle to the said armaturele'ver and carrying a contact portion for engagement by the said armature contact portion, and a bearing for the said bar to slide in and for holding the bar against turning to maintain the faces of' the said contact portions at all times in the same straight-line registering position.

2. A Ruhmkorfl' coil provided with a spring armature-lever carrying a contact portion, a bar arranged at an angle to the said armaturelever and carrying a contact portion for engagement by the said armature contact portion, a bearing for the said bar to slide in and for holding the bar against turning to maintain the faces of the said contact portions at all times in the same straight-line registering position, and afastening device for securing the bar in place in the said bearing after the dcsired adjustment is made.

3. A Ruhmkorff coil provided with a spring armature-lever carrying a contact portion, a bar carryinga contact portion for engagement by the said armature contact portion, a bearing for the said bar to slide in and for holding the bar against turning, and aspring pressing against the bar at the end opposite the one carrying the contact portion.

4. A Ruhmkorff coil comprising a coil-cylinder carrying the primary Aand secondary wires and the core, a spring;armature-lever fixed at one end and carrying at its free end an armature located opposite the said core, a contact portion on the said armature-lever, intermediate the fixed end and the said armature, a bar slidable at an angle toward and from the said armature-lever and carrying a contact portion opposite the said armaturelever contact portion, and means for the bar to slide in and to hold it against rotation to maintain the faces of the said contact portions at all times in the same straight-line registering position.

5. A Ruhmkorff coil comprising a coil-cylinder carrying the primary and secondary wires and the core, a spring armature-lever fixed at one end and carrying at its free end an armature located opposite the said core, a contact portion on the said armature-lever, intermediate the fixed end and the said armature, a bar slidable at an angle toward and from the said armature-lever and carrying a contact portion opposite the said armaturelever contact portion, means for the bar to slide in and to hold it against rotation to maintain the faces of the said contact portions at all times in the same straight-line registering position, and means for holding the said armature and armature-lever in position while adjusting the said bar in the direction of its length.

6. A Ruhmkorff' coil comprising a coil-cylinder carrying the primary and secondary wires and the core, a spring armature-lever fixed at one end and carrying at its free end an armature located opposite the said core, a contact portion on the said armature-lever, intermediate the fixed end and the said armature, a slidable bar carrying a contact portion opposite the said armature-lever contact portion, means for the bar to slide in and to hold it against rotation, a spring pressing the said bar in the direction of' its length, and retaining means engaging the said armature and armature-lever for holding the armaturelever in position while adjusting the bar.

7. A Ruhmlrorff coil comprising a coil-cylinder carrying the primary and secondary wires and the core, a spring armature-lever fixed at one end and carrying at its free end an armature located opposite the said core, a contact portion on the said armature-lever, intermediate the fixed end and the said armature, a slidable bar carrying a contact portion opposite the said armature-lever contact portion, means for the bar to slide in and to hold it against rotation, a spring pressing the said bar in the direction of its length, and retaining means engaging' the said armature and armature-lever, for holding the armature-lever in position while adjusting the bar, the said retaining means consisting of a lever fulcrumed in the end of the coil-cylinder and adapted to be swung into position between the said cylinder and the inner face of the and from the said armature-lever Contact porarmature and armature-lever. tion.

8. A Ruhmkorf coil having an armaturelIn testimony Whereoflhave signed my name lever Contact portion and a Contact portion to this specification in the presence of two subopposite the said armature-lever Contact porscribing Witnesses.

tion, and non-rotatable, tO maintain the faces of the said contact portions at all times in the same straight-line registering position, Witnesses:

the said'non-rotatable Contact portion being THEO. G. HOSTER,

adapted to be moved at a right angle toward EVERARD BOLTON MARSHALL.

JOHN MOINTYRE.

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