US928934A - Contact device. - Google Patents

Description

G. BRENT. CONT-ACT DEVICE.

APPLICATION FILED NOV. 5, 1906.

928,934." Patented July-27, 1909.

2 SHEETS-SHEET l.

C. BRENT.

UONTACT DEVICE.

APPLICATION FILL 1mm, 1906.

928,934. Patented July 27, 1909.

2 SHEETS-SHEET 2.

M5555.- Jzz #5222272- QXXMTK. h

UN TED STAWENT OFFICE.

CHARLES BRENT, or BRANDON, MANITOBA, CANADA.

coN'rAc'r DEVICE.

Specification of Letters Patent. Patented July 27, 1909.

i Application filed November 5, 1906. Serial No. 342,014. I

To allwh'om it may concern:

.Be it known that I, CHARLES BREN'r, re-

siding at Brandon, in the Province of Mani-. toba and Dominion of Canada, have invented a certain.new and useful Improvement in Contact Devices, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

It is customary in many places such as in hotels, warehousesv and factories to provide each of the rooms with, or so arranged in differen't parts of such establishments, devices for operating a suitable annunciator at the office or in anyother desired place to indicate. the part of the building in which'afire is located, in case of a fire breaking out. These devices have been quite numerous and have {given more or less satisfaction, but it has "'beenfound in practice that they get out of order and do not-work just at the time when they are most. needed. It is also-'afact that in most instances they are very difficult to adjust and are not sufficiently sensitive in their operation.

It is the ob ect of this invention, therefore, to provide a'thermall operated device,

which will operate a s uitab e annunciator andwill be easy of adjustment oughly reliable.

lt is also a feature of this invention to pro vide a device which can be used with a-callbell system already in use in hotels and the gage the contact, complete the circuit and in that way indicate upon the annunciator the lace where the device is in operation and the ocation of the fire.

The invention may be further briefly sum-' marized as consisting in constructionand combination of parts hereinafter set forth in the following descriptions, drawings and claims.

Referring to the drawings, Figure 1 is a detail view of the devicewithsome of the as well as thorthe bar it wil nunciator may be emp parts broken away to more clearly show the construction thereof, and Fig. 2 shows the device applied to anelectrical iannunciator system.

In the drawings one form of the device is shown and it consists'of a supporting mem-' her 1 which may be made in the form of a plate tobe secured to the Wall or ceiling or.

may be supplied with a wood screw 2, which may be readily secured in the wood-work. This supporting member 1 is provided with a threaded opening for receiving the shank 3 of a binding post 4 having an opening 5 for the reception of one of the wires of the circiliitand a set screw 6 for holding the wire in p ace. ing in the thermostatic bar to be described,- to hold the same in place. The thermostatic bar above mentioned is preferably made up of a strip 7 and astrip 8 secured together preferably by soldering and bent into the :form of a loop as shown. The

The shank 3pa'sses through an open strips of-this bar are preferably of metals having diierent co-efiicientaof expansion and in practice I have 'found that when the strip 7 is of steel without temper, and the strip .8 is of zinc, very good results, are obtained.

One end 9 .of the thermostatic bar ex tends beyond the supporting member 1 where it is provided with an opening 10 adapted to receive an insulating washer 11 surrounding a screw 12 passing through a .Washer 13 and into a binding-post 14 in a manner such that all ofthe parts are clamped tightly to the bar. screw 16 serve to hold the other line of the circuit. At the end of the binding-post 14 a contact screw 17 is rovided and 1t is ar- The opening 15 and set ranged to be adjusted in and out as the case" may be and he (1 in such adjusted position by means of a set screw 18. Thethermostatic bar is arranged to form a loop or ring as shown and its end remains free to 006p crate with the contact screw 17 which is more mally adjusted so that the bar is outof contact therewith. 7

From the foregoing descriptions" it is obvious that upon the application of heat to 17, thus completing the circuit at this point. Any-preferred wiring for and form of an oyed, but a very efii- I expand and cause the free end lto moveout and engage the contact screw cient form is shown in the drawing wherein the Wire 20 represents the ground wire connected to all parts of the building, to the binding-post 14 of each contact device, and to the battery 21. The wire 22 connects the battery with the annunciator 23 and a wire "In a hotel where call-bell systems are al' ready installed, one of these devices may be inserted in the circuit in eachroo'm and in case of fire the device will operate in the manner already described. Thecall-bell will ring at the office and will continue to ring as long as the bar holds the circuit closed or as long as the hightem erature continues. From this the clerk wil know that there is probably a fire in the room corresponding to the indicating device on the annunciator.

1. In a contact device, incombination, a support, a binding post carried thereby, a thermostatic bar secured intermediate of its ends to said post and having one of its free ends bent around to form a loop, a coin tact screw mounted in and insulated from the other one of the ends of said bar, the end of the loop being adapted to normally remain out of engagement with said contact but. when heated to engage the same; said bar being composed of two strips of metal secured together and having different co efficients of expansion.

2. In a contact device, in combination, a

support, a post carried by said support, a

thermostatic bar secured near :oneend to said support and having its other end bent around in the form of a loop said loop being composed of two strips of metal secured together and having different coefficientsof expansion, the one with the greater expansion being arranged on the inside of the loop, a contact screw mounted inthe end of said bar-and ada ted to be engaged by the free end of said oop, said free end being normallyout of contact with said screw, and means for holding said contact screw in any adjusted position.

lntestimony whereof I aflix my signature in the presence of two witnesses. Havlng described my inventlon, I cla1m L CHARLES BRENT.

' VVitnessesL JosEPH E. GAVIN,. J OHN M. Pnovoosr.

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