US1241139A

US1241139A - Electromagnetic device.

Info

Publication number: US1241139A
Application number: US13133616A
Authority: US
Inventors: Will C Neahr
Original assignee: PROTECTIVE SIGNAL Manufacturing Co
Current assignee: PROTECTIVE SIGNAL MANUFACTURING Co
Priority date: 1916-11-14
Filing date: 1916-11-14
Publication date: 1917-09-25
Anticipated expiration: 1934-09-25

Description

W. C. NEAHR.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED NOV. 14. I916.

Patented Sept. 25, 1917.

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i Mi! -Ew W. C. NEAHR.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED N&V.14. I916.

Patented Sept. 25, 1917.

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UNITED STATES PATENT OFFICE.

WILL C. NEAI-IR, 0F DENVER, COLORADO, ASSIGNOR TO THE PROTECTIVE SIGNAL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

ELECTROMAGNETIL'! DEVICE.

Specification of Letters Patent.

Patented Sept. 25, 191 '7.

To all whom it may concern:

Be it known that I, WILL C. NEAHR, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Electromagnet Devices, of which the following is a specification.

The present invention relates to electromagnetic devices, and more specifically to improvements in the mechanism disclosed in my co-pending application, Serial No. 29,7 51.

The primary object is to provide a simple, compact, and thoroughly practical structure which is of novel character, and which is not liable to derangement.

Another and important object is to provide mechanism peculiarly useful in connection with alternating currents, and designed to prevent excessive chattering due to the frequency thereof while preventing the movable armature member from sticking after the current is cut off from the coil.

An embodiment of the invention that has proven entirely satisfactory, is illustrated in the accompanying drawings, wherein Figure 1 is a side elevation of the device,

Fig. 2 is a top plan View thereof,

Fig. 3 is a vertical sectional view through the apparatus,

Fig. 4 is a horizontal sectional view,

Fig. 5 is a detail View in elevation of the switch mechanism and associated parts, and

Fig. 6 is a reverse view of the parts illustrated in Fig. 5.

Similar reference numerals designate corresponding parts in all the figures of the drawings.

Inthe embodiment illustrated, a casing is employed, preferably comprising a cylindrical side wall 7 of glass mounted on a base 8, and having a cap 9 of insulating material. The base and cap are connected by tie bolts 10, which serve to hold the casing in assembled condition.

Within the casing, is suspended an electro-magnet 11 of suitable construction, preferably having a tubular core 12 that ties together a lower head 13 and an upper head 14:, the coil 15 surrounding the core and being suitably incased, as shown at 16. The head 14: is considerably heavier than the head 13 and is provided with a pair of out standing ears 17. Upright bolts 18 pass through the ears and through the cap 9, the heads 19 of the bolts being seated in grooves 20 formed in the under sides of the cars 17, and the stems of said bolts projected well above the cap 9, and being threaded, as illustrated at 21. Binding nuts 22 are screwed upon the threaded ends, so that these bolts constitute binding posts, as will be readily understood. The terminals 23 of the electro-magnet are electrically connected to the bolts 18, so that said binding posts constitute means for attaching leads to the electro-magnet. The head 1a of the electro-magnet is spaced a considerable dis tance from the cap 9 and for this purpose spacing sleeves 24: are located on the bolts 18 between the ears 17 and the under side of the cap.

The space thus produced'between the head 1e and the cap 9 is utilized by an electric switch member. This member, as shown,

consists of spaced metallic fingers 25 piv-- oted, as shown at 26, to heads 27 formed upon the lower ends of binding posts 28 that extend through the cap 9 and project thereabove. These fingers 25 are electrically connected to the heads 27 by suitable yielding strips 28 The fingers 25 are furthermore connected by a cross bar 29 of insulating material, and said bar has an outstanding ear 30 through which is passed the stem 31 of an armature 32 that is located in the tubular core 12 of the electro-magnet. This armature comprises a fixed upper member 33 of magnetic material through which the stem 31 slidably passes. Carried by the lower end of the stem is a movable plunger element comprising a section 32 of magnetic material, the upper end of which is recessed and cooperates with the lower end of the fixed armature member 33. This section 32 is abutted against a shoulder 33 formed on the stem 31. Screwed upon the lower end of the said stem and therefore carried thereby is a lower section 32 of magnetic material that is hollow to reduce its weight, and interposed between the

sections

32 and 32 is a section 32 of non-magnetic material, preferably brass.

The section 32 is proportioned to the member 33, so that enough lines of residual magnetism are allowed to hold the weight of the lower member during the change of current, and while the voltage is at zero, but is small enough so that the two will not stick when the circuit through the coil has been broken. The concave upper end of the member 32" prevents any accumulation of dust and dirt on the top of the armature, which might cause the same to stick, and the small contact surface will hold better when the coil is energized, and will also break quicker after the current has been cut o'd from the coil. By this arrangement therefore it is found that chattering is eliminated.

The upper end of. the stem 31 carries a flange 34k and a pad 35 which are disposed below the car 30 of the cross bar 29, thereby constituting an abutment that strikes the under side of said car, while a washer 36 and clip 37 located on the stem above the ear 30 limits the downward movement of the stem and armature with respect to the bar.

Secured to the fingers 25 and extending above and below the free ends of the same, are contact members in the form of leaf springs 38 that have their free ends normally spaced from the free ends of the fingers. Arranged above the upper contact springs 38 are contact elements 39 formed by the lower ends ofbinding posts 40, and other contact elements 41 are located below the free ends of the lower springs 38, these latter contact elements being carried by brackets 42 supported from the cap 9 by binding posts 43.

With this arrangement, it will be evident that when the electro-magnet is deenergized, the armature 32 will drop, and as a consequence, the switch member will fall, so that the lower contact springs 38 will en age the contact elements 41, and the free en s of the fingers 25 will rest upon the engaged tor-- minals of the springs 38, so as to insure and maintain an electrical contact. On the other hand, when the electro-magnet is energized, the armature 32 will be elevated, thereby raising the switch member and causing the upper set of contact springs 38 to engage the contact elements 39, the free ends of the fingers 25 also engaging these contact springs and insuring a good electrical con tact.

From the foregoing, it is thought that the construction, operation, and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a device of the character set forth, the combination with a casing having a cap, of an electro-magnet having a head adjacent to but spaced from the cap, bolts passing through the head and cap for securing the two together, spacing sleeves loosely mounted on the bolts and interposed between the head and cap, and leads for the magnet engaged with the bolts and located on the underside of the cap.

2. In a device of the character set forth, the combination with a casing having a cap, of an electro-magnct having spaced heads, one of which is adjacent to but spaced from the cap, bolts passing through the heads and cap for securing the two together, means on the bolts interposed between the head and cap, an armature receiving sleeve connecting the heads of the electro-mngnet, an armature movable in the sleeve, and a device actuated by the armature and located in the space between the head and cap.

3. In a device of the character set forth, the combination with spaced swinging arms pivotally mounted at one end and having their other ends tree, of a member of insulating material connecting the arms between their ends, spring contuct elements connected to the arms and extending alongside the free ends thereof, contact elements with which the spring elements coact, an electro-magnet and an armature operated by the electro-magnet and engaged with the member of insulating material to swing the arms.

4. In an electro-magnet device for use with alternating currents, the combination with a coil, of an armature ing a fixed member and a plunger member movable toward and from the fixed member, one of said members comprising sections of magnetic material, and a section of nonmagnetic material interposed between the sections of magnetic material and an actuating device operated by the plunger and securing the sections together.

5. In an 'electro-magnetic device for use with alternating currents, the combination with a coil, of an armature therein comprising a fixed member of magnetic material and a plunger member movable toward and from the fixed member, said plunger member comprising sections terial, and a section of non-magnetic ma terial interposed between the sections of magnetic material, one of the sections of magnetic material operating adjacent to and being attracted by the fixed member and" being so proportioned with respect thereto as to hold the plunger against retrograde movement during the change in current and permit the retrograde movement of the plunger when the coil is deenergized.

6. In an electro-magnetic device for use with alternating currents, the combination with a coil, of a fixed armature member therein, a stem passing through the fixed member, and a movable armature member therein compris-' of magnetic ma comprising a section of magnetic material on the stem cooperating with the fixed member, another section of magnetic material on the stem, and a section of non-magnetic material interposed between said sections of magnetic material, said stem constituting means for securing the sections together.

7 In an electro-magnetic device for use with alternating currents, the combination with a coil, of a fixed armature member therein, a stem passing through the fixed member, and a movable armature member mounted on the stem, said movable member comprising a section of magnetic material cooperating with the fixed member, one of the adjacent races of the fixed member and section being recessed, another section of magnetic material having a hollow portion, and a section of non-magnetic material interposed between the sections of magnetic material.

8. In an electro-magnetic device for use with alternating currents, the combination with a coil, of a fixed armature member and a plunger armature member in the coil, one of said members comprising sections of Copies of this patent may be obtained for magnetic material and a section of nonmagnetic material between said sections, one of the sections of magnetic material directly coacting with the other member and being so proportioned thereto that it will retain its attracted relation with respect to said other member during the change of current, but will be retracted from said position when the current ceases.

9. In an electromagnetic device for use with alternating currents, the combination with a coil, of a fixed armature member, a

stem slidable through said fixed armature five cents each, by addressing the Commissioner of Patents,

Washington, D. 0.