US939292A - Test for fire-alarm apparatus. - Google Patents

Description

J. G. NOLEN.

TEST FOR FIRE ALARM APPARATUS. APPLIOATION FILED SEPT. 24, 1903.

939,292, Patented Nov. 9, 1909.

neuron STATES rA'rE OFFICE.

JAMES NOLEN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO FRANK B. COOK,

. OF CHICAGO, ILLINOIS.

TEST FOR FIRE-ALARM APPARATUS.

Specification of Letters Patent.

Application filed September 24, 1903.

To all whom it may concern:

lie it known that I, James G. NoLnN, a citizen or the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Tests for Fire-Alarm Apparatus, of which the following is a specification.

invention contemplates a novel form of test for ascertaining whether or not the signal-transmitting mechanism of an electrical fire-alarm signal is in the proper or desired condition.

in a certain type of fire alarm system, master-boxes are employed for transmitting signals, each master-box being on the plan of the ordinary and well known call-box, with the exception that each masterbox is preferably provided with means whereby it may remain normally in. a wound-up con dition, and whereby it may be automatically released to transmit a fire-alarm signal whenever the building in which are located 'nccted catches fire.

the thermostats with which the box is con- It is important that these master-boxes be retained in their nor- .mally wound-up condition, so as to be in readiness to transmit a fire-alarm signal, and it is with a View to enabling an attendant or inspector to readily determine the condition of these master-boxes that I provide what I term a test-box. This test-box may also be constructed on the plan of the ordinary and well known call-box, and is preferably connected in series with the inastcr-box. The master-box is provided with a normally open shunt orshort circuit extending around the-test box, and also with means for automatically closing this shunt or shortcircuit when the clock-work of the masterbox has been allowed to run down. With this arrangement, a test-signal can be trans mitted by the test-box when the master-box in its normal wound-up condition; but if the inaster-box' has run down, and the said shunt or short-circuit has thereby been closed, then it will be readily seen that the test-box cannot be employed to transmit a signal over the line circuit, as it is completely short-circuited. The provision of a test of this character enables an attendant or inspector to readily and accurately de termine the condition of the master-box without disturbing the mechanism of the latter.

To the foregoingand other useful ends my invention consists in matters hereinafter set forth and claimed.

In the accompanying drawings,-Figure l is a diagram illustrating the make-andbreak devices of a master-box, and a testbox connected, up in accordance with the principles of my invention. Fig. 2 is aside elevation of a master-box and also of a testbox, the two being connected in the manner shown in Fig. 1.

As thus illustrated, the master-box or signal-transmitting device A can be of any suitable known or approved construction. It ispreferably constructed on the plan of the ordinary and well known call-box, With the exception that it is preferably provided with means for locking it in a normal wound-up condition, and with further means for automatically releasing its normally wound-up clock-wrk when any of the thermostats with which the box is connected'are subjected to the heat of a fire. Such being the case, its construction involves the usual and well understood make-and-break device B, consisting of a rotary notched-disk 6 adapted to be rotated by the clock-work of the box, and a spring-held finger I). The

usual crank C is provided for winding up the clock-work of the box. As a means for closing a shunt or short-circuit around, the test-box, this master-box is preferably provided with a spring contact- I) adapted to be engaged by a pin 0 on the shaft of the crank C. The test-box E can also be constructed on the plan of the ordinary and well known call-box. Its mechanism involves the well knowrform of make-and-break device F, consisting of the rotary notched disk 7 and .the spring finger f, the said disk be.- ing adapted to be rotated by the clock-work of the box. with the usual crank G by means of which its clockwork can be woifnd up in the Wellknown manner. It will be seen that both of said make-and-break devices are normally closed. It will also be observed that the make-and-break device of the test-box is connected in series with the make-and-break device of the master-box. Consequently, when the mechanism of the master-box is in its normal condition, the make-and-break device of the test-box can be employed for transmitting a test signal over a line circuit including the disk I) and the spring finger b This test-box is also provided But suppose now that for some reason or other the said master-box has been allowedv to run down, thereby causing the pin 0 on the crank shaft to engage the contact D.

the contrary, the operation of the test-box results in the transmission of no signal, then it will be understood that the master-box has been allowed to run down to an extent to short-circuit the test'box.

It will be seen that my improved testing arrangement can be employed in conjunction with various kinds of electrical signaling systems. p

- i I claim as my invention 2 l. The combination of a suitable circuit, a normally Wound master signaling device in the circuit normally closing the same, a test device comprising a circuit breaker, in said circuit, and means associated with the first said signaling device short circuiting the circuit'brealrer. of the testdevice when the master signalingdevice is run down to a predetermined degree.

2. The combination. of an electrical circuit including two signal transmitting devices connected in series, and means adapted, upon the operation of one of said devices to short circuit the other device; one signal transmitting device including normally Wound up clock Work, adapted when released to oper-- ate the means for effecting a short circuitin of the other device, and the other signa transmitting device including normally unwound clock work.

3. The combination of two signal transmitting devices, suitable circuit connections, and means adapted upon the operation of one of said devices to short circuit the other device, one signal transmitting device inseason eluding normall woundmp clock work,

adapted when re. eased to operate the means for efiecting a short circuiting of the other device, and said other signal transmitting device including normally unwound clock Work.

4, The combination of a signal transmitting device, a testing device, suitable circuit connections, and a normally open switch adapted automatically to close a short circuit around the testing device upon the operation of the signal transmitting devices,

said signal. transmitting device including normally Wound-up clock work and said testing device including normally unwound clock Work. I

5. The combination of a signal transmitting device, another signal transmitting device, a line circuit connected with both of said devices, each device being adapted for transmitting a signal over the line circuit, and a normally open switch adapted automatically to close a short circuit around one of said signal transmitting devices upon the devices; one signal transmitting device ineluding normally wound-up clock work and the other signal transmitting device includ ing normally unwound clock work.

6. The combination with an alarm signal transmitter providing normally closed circult-breaking contact parts, of a test trans-- mitter arranged to signal through acircuit including said contact parts of the alarm transmitter, and means controlled by the alarm transmitter for incapacitating the test transmitter to functionally operate, upon the occurrence of predetermined conditions no the alarm transmitter.

7. The combination with a normally wound alarm signal transmitter, of a test-signal transmitter, and means for incapacitating the test-signal transmitter to functionally operate upon the running down of the nor-- mally wound transmitter.

Signed by me at Chicago, Cook county, Illinois, this 21st day of Se t; 1903.

J AME Gr. NOLEN. Witnesses: 1

A, F. Donna's, WM. A. ilannnns.

75 operation of'the other signal transmitting

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