US1308585A - Method and apparatus for adjusting armatures of electromagnetic - Google Patents

Description

C. O. HARRINGTON. METHOD AND ABPARHUS FOR ADJUSTING ARMATURES 0E ELECTROMAGNETIC DEVICES. APPLICATION FILED JAN. I7. I917.

1,308,585. Patented July 1,1919.

E] Y m wnuzsss mvzu-ron THE COLUMBIA PLANOGIAPH 60., WASHINGTON, D. 1:.

UNITED STATES PATENT OFFICE.

CLINTON O. HARRINGTON, OFEDGEVI'OOD BOROUGH, PENNSYLVANIA, ASSIGNOR TO THE UNION SWITCH & SIGNAL COMPANY, OF. SWISSVALE, PENNSYLVANIA, A COR- PORATION OF PENNSYLVANIA.

METHOD AND APPARATUS FOR ADJUSTING ARMATURES OF ELECTROMAGNECIIIG DEVICES.

Specification of Letters Patent. I

Patented July 1, 1919.

Application filed January 17, 1917. Serial No. 142,818.

T 0 all whom it may concern.

Be it known that I, CLINTON O. HARRING- TON, a citizen of the United States, residing at Edgewood borough, in the county of Allegheny and State of Pennsylvania, have in vented certain new and useful Improvements in Methods and Apparatus for Adjusting Armatures of Electromagnetic Devices, of which the following is a specification. 1 1

This invention relates to electromagnets, and has for its object the provision of a method and apparatus for adjusting the armature of an electromagnet to give a predetermined torque to the armature when the eloctromagnet is supplied with a current of a predetermined potential and the armature is in the closed position, whereby the proper functioning of the armature will be insured.

Other objects of the invention will appear from a consideration of the following de tailed description, taken inconnection with the accompanying drawings forming a partof this specification, with the understanding, however, that the embodiment illustrated,

though practical, is by no means the onlyshowing of the drawings, but may be changed and modified in various particulars within the scope of the appended claims.

In the drawings, Figure 1 is a view showing, in rear elevation, one form of electromagnet having applied thereto oneform of apparatus embodying my invention, such apparatus being diagrammatically shown in part. Fig. 2 is a vertical sectional view taken on the line IIII of Fig. 1.

Similar reference characters refer to similar parts in each of the views.

Referring to the drawings in detail, my invention as here shown is applied to an electromagnetic device M, comprising two windings W and W mounted on cores C and C respectively, the lower ends of the cores being formed withenlarged portions F and F respectively, which constitute pole pieces. The upper ends of the cores C and. C are reduced in diameter to pass through holes in a back strap S, and are threaded to receive nuts 10 and 10 respectively, where by the back strap S and the windings W and V are retained uponthe cores. The electromagnet also includes an armature A mature A to be attracted to the pole pieces F, F, as will be understood. The movement of the armature A toward the pole pieces may be limited, so as to vary the closed position of the armature, by means of a screw X, which passes through a threaded hole in a bridge bar 12. The bar12 is formed of non-mag netic material, such as brass or the like, and as best seen in Fig. 1 connects the cores C and C at a point between the windings W and W and the pole pieces F and F, the opposite ends of the bar being formed with suitable openings to receive the cores. The medial portion of bar 12, adjacent its forward edge, is provided with a threaded opening to receive the screw.X, such screw having its lower end. rounded for engagement with the armature A. Mounted upon'the screw at the underside of the bar 12 is a nut 13 which is designed to coact with the bar to lock the screw in adjusted position, as will be understood. Y

From this construction, it is evident that by adjusting the screw X vertically within the bar 12, the closed position of the armature A with respect to the pole pieces F and F will be accordingly varied.

The screw X is then adjusted to a point which the operator thinks may be approximately correct, and, while the armature A is held in contact with the screw by hand or otherwise, the pole-changer P is suddenly reversed and the throw of the galvanometer needle is noted. If the throw is greater than the proper value, the screw X is turned down to give a larger air gap between the armature and the pole-faces when the armature is in contact with the screw; it the throw is less than the proper value, the screw is turned'up to reduce this air gap. The process is repeated until the galvanometer throw is the proper value upon reversal of the pole-changer, and when the proper adjustment of the screw is secured it is locked in such position by the nut 13. It will then be known that when the electromagnet is energized at the proper current value and the armature is in engagement with the screw X, the desired torque will be exerted on the armature. This desired torque can thus be secured irrespective of any irregularities in the magnetic circuit such, for example, as unevenness of the pole faces or of the armature, or additional reluctance at the junction of the back strap with either core.

My invention is of particular advantage in connection with electromagnetic relays wherein contacts are operated by the armature A. In such instance the pressure exerted on the contacts when the armature is closed will bethe desired value regardless of irregularities in the magnetic circuit, provided the electromagnet is energized at the predetermined current value. My invention is not, however, limited to electromagnetic relays, but is applicable to any electromagnet regardless of the means' controlled or operated by the armature.

Having thus described my invention, what I claim is:

1. An apparatus of the character described, comprising an electromagnet including an armature, a source of current for said electromagnet, means for varying the flow of said current as supplied to said electro magnet, means for determining the magnetic flux in the magnetic circuit of the electromagnet, and means for adjusting the closed position of said armature.

2. An apparatus of the character described, comprising an electromagnet including an armature, a source of current -tor said electromagnet, mean for determining the magnetic flux in said armature, and means for adjusting said armature to cause the armature to carry a predetermined flux at a given energization of the electromagnet when the armature is in closed position.

3. The method of adjusting an armature with relation to an elcetromagnet so that when the armature is in. the closed position a given energization of the magnet will cause a predetermined pull on the armature, which consists in supplying a given current to the magnet, measuring the magnetic flux produced thereby in the armature, and adjusting the closed position of the armature to such location that the flux in the armature has a predetermined value.

4. The method of adjusting an lli'lllltlll'G with relation to an electromagnet so that when the armature is in the closed position a given energization of the magnet will cause a predetermined pull on the armature, which consists in supplying a given current to the magnet, measuring the magnetic flux pro duced thereby in the magnetic circuit, and adjusting the closed position of the armature to such location that the flux in said magnetic circuit has a predetermined value.

Intestimony whereof I aiiix my signature in presence of two witnesses.

CLINTON O. HARRINGTON.

Vitnesses A. HERMAN IVEGNER, EDWIN D. IAMS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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