US1001152A

US1001152A - Attachment for electric motors.

Info

Publication number: US1001152A
Application number: US59325610A
Authority: US
Inventors: William A Lawrence
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-11-19
Filing date: 1910-11-19
Publication date: 1911-08-22
Anticipated expiration: 1928-08-22

Description

'w. A. LAWRENCE.

' ATTAGHMBNT FOR ELECTRIC MOTORS.

APPLICATION FILED NOV; 19, 1910.

Patented Aug. 22, 1911.

Z Inventor 4 y 2 J J J 1 25:55!

Attorneys UNITED STATES. PATENT OFEIGE,;

- WILLIAM A; LAWRENCE, or CHARLOTTE, non'rrt CAROLINA? ATTACHMENT roe ELECTRIC MOTORS.

Specification off Letters Patent. Patented Aug. 22,1911.-

Application fi1ed=November 19, 1910. Serial No. 593,256.

facts will be communicated to an observe-r,

through the automatic operation of a signal.

Another object of the invention is to provide an adjustable support in which a contact element is held, the contact elementbeing releasable when an unusual degree of heat is generated in the machine, to close an electric circuit and to operate a signal; novel means being provided for actuating the contact element, subsequent to its release.

\Vith the above and other objects in view, which will appear as the description proceeds, the inve tion resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the drawings, Figure 1 shows in side elevation, and conventionally, an electric motor to which the device of my invention has been applied; Fig. 2 shows the invention in side elevation, the View being a detail en.-

larged from Fig. 1; Fig. 3 is a section upon the line'A-B of Fig. 2, parts being shown in elevation; and Fig. 4 is a section upon the l' {e C-D of Fig.2, parts being shown in elie vation.

{in the drawings, the motor is denoted generally by the numeral 1, and the hearing by the numeral 2, the armatmic shaft- 3 1'0- tating in this bearing 2.

In carrying out the invention there is provided .a ring 4, adapted to i'nclose the armature shaft 2, and to be secured to the motor 1. Ordinarily, this ring 4 is secured to the motor 1 by means of screws 5. An insulatirfg sheet 6 is interposed between the ring at and the motor 1, and an insulating tube 7 surrounds each of the'screws'o so as to-"insulate the said screws from the 'ring- 4. Moreover, insulating washers 8 are into; posed between the heads of the screws and the outer face of the ring 1. The diameter of the open ng in the ring 4 is somewhat greater than the diameter of the armature shaft 3, and by reason of this fact, a space '9 exists between the armature shaft '3 and the inner face of the ring 4.

In the edges of the ring 4 there are a plurality of threaded radial" openings 1O.

In each opening 10 a screw is mounted,

the screw carrying a loci: nut l2 'which',en--

gaging the ring 1, serves to hold'the screw 11 against rotation. In the inner endof the screw 11 there is a channel 14, in which a contact element 15,.ordi1iarily of copper or the like, is slidably mounted. This contact element 15 is held in place-within the channel 14:, and out of 'contact fwith the armature shaft 3 by means of one oran'ore- 1 touches of solder 16', or othermaterial-which i willmelt at a very low temperature infact,

melt at a temperature produced by the fric-f tional heating of the armature shaft- 3, the shaft 3 being typical of any moving part of a machine with which the device is adapted I to be assembled.

A spring 17 is seated in each of the channels 14, this spring 17 acting compressively to force the contact element 15 outwardly, as soon as the solder 16 has been melted away.

A binding post 18 is secured to the ring 4, and another binding post 19 is secured to the motor 1. From the binding post 18 a conductor 20'leads to an electric bell 22, which may be taken to typify any sort of signal which may be operated electrically. Another conductor 21 leads from the binding post 19 to a battery 23, another conductor 24 leading from the battery'2t to the electric bell 22.

From the foregoing explanation of the circuit, it will be seen that the ring 4 upon the one hand, and the armature shaft 3 upon the other hand, form the terminals of an electrical signal circuit which is normally open.

In case the armature shaft 3 or its bearing should be unduly heated, the fusible mawhereupon the spring 14 will actuate the .contactelem'ents 15 until one or more of i them come into bearing with the armature I shaft 3. The circuit will thus be closed, and

the'bell or other signal 22 be operated, thereby lndlcating at once, an undue heating in the motor.

It is to be noted; that should the armature fshaat 3, although not overheated, work loose material 16 is united in its hearing, so as to have a gyrating motion, the shaft, under such circumstances,-

tact elem nt; and'the armature shaft 3 may be adj'iiste When the screws 11 have thus 138611111016 [the nredetermin'ed positions, they may-bethere held by rgotating the lock nuts 12 into abutment with the ring 4:.

The ring constitutes-a holder for the screws 5-,. and the r ng 4: and the screws 5 constitute the 'carryingmeniber for the contact elements 15. Thescrews 11 act assup- .ports for the spring's'14 and the Contact elements 15. Obviously, the fusible material 16 constitutes a;-ithermostaticmeans whereby the contact-elements 15 are held in place.

By reason of the fact that this fusible with the contact element 15 and with the screw 11, it will be noted that thescrew 11 may be rotated to adjust the position of the contact element 15 with respect tothe armature shatt 3'without in any way breaking the. continuity between the fusible material 16 and the contact ele- -1ncrit 15.

- Having thus described the invention, what is claimed is:

1. In a device or the class described, a holder adapted to be secured to a machine in the vicinity of a moving par; of the machine; a screw threaded into the holder and provided with a channel in one end; a con-' tact element slid-able 1n the channel to'bear upon said *machine part, thereby to close an electric signal circuit of which the said part and contact element are terminals; a spring in the channel, for sliding the'contact element; and fusible material connecting the contact element with the screw to maintain the contact element spaced from said part.

2. In a device of the class described, a holder adapted to be secured to a machine in the vicinity of a moving part of the machine; a screw threaded into the holder and provided with a channel in one end; a lock nut upon the screw engaging the -holder; a contact element slidable in the channel to bear upon said machine part, thereby to close an electric signal circuit of which said part and the contact element. are terminals; a spring in the channel, for sliding the contact element; fusible material connecting the the contact element-spaced from said part.

1 In testimony that I claim the foregoing as my own, I have hereto affixed my sigcontact element with the screw to maintain 1