US983345A - Thermostat. - Google Patents

Description

f UNITED sTATEs PATENT oEEioE.

JULIUS BOEKEL, 0F PHILADELPHIA, PENNSYLVANIA.

THERMOSTAT.

Specification of Letters Patent.

Patented Feb.l '7, `1911.

Application filed April 30, 1910. Serial No. 558,706.

To all 'whom itimay concern:

Be itknown that I, JULiUs BOEKEL, a citizen of the United States, residing at'Philadelphia,

in the county of Philadelphia and State of' Pennsylvania,

have invented certain new and useful Improvements in rIhermostats; and I do hereby declare the follow-,

ing to bel a full, clear, and exact description of the invention, such as will enable others skilled in the 'art to which it appertains to make and use the same. f

This invention relates to thermostats and moie particularly to the means of adjusting the same. f

It also relates to the particular construcv tion of the adjusting screw and other fea tures hereinafter set forth. Its object is to .provide a liner and larger range of'adjustment, to provide an escape for the air which would otherwise be compressed at the top of the mercury chamber and so hamper the eX- panding of the latter and to produce a cheap, simpleand perfect instrument, all of these objects being attained by the construction and vcombination of parts hereinafter more particularly set forth and claimed.

' In the accompanying drawings: Figure 1 represents a view in vice embodying my invention, circuit wires.

a and Z)y being connected to their respective 4 posts land being broken od short, and a battery through which one of said wires runs. Fig. 2 represents a verticalA sectional view through the thermostat, .initting the wires and battery;v ig. 3 represents an enlarged detail view of the adjusting screwas shown inv Fig. 2; and Fig. 4 represents a slight modification in the upper part of my inven tion, in which the air-vent extends through from the side ofthe plug.

1 designates a .long cylindrical tube for holding the mercury. Said tube is provided Awith external screw threads on itsuppei end and a slot across its bottom end for assisting in screwing and unscrewing the tube or receptacle. maybe of any metal or other substance ,that will act asa suitable conductor for'the"`elec' tric 'current or ,thev contacts might bejrunv through a non-conductor material' -tofthel mercury.

12 designates fitsjtightly the .attaching collar,` which around thetube 1 just below the screw-threads'before mentioned, for the wire ll andiis'p-r'ovided with a laterally projecting. lstud B.

Thisstud ris provided withfa hole' frontelevation of a de vis screwed into A electric contactl The material iised inv said tube; certain predetermined degree ofv heat has for the insertion of said wire a and is screw-l tapped in its end to permit the thumb-screw 5 to be screwed into the stud and to project into the hole 4. After the wire a is inserted in the hole t the screw 5 will be screwed into the stud and will engage and bind the wire a firmly in position.

6 designates a block, closure or plug composed of some non-conductible or insulating material having an internally' screwfthreaded recess 7 in its lower end corresponding in size to the external size of the externally screw-threaded end of tube 1. Saidv I:plug has a straight hole or channel 8 extending straight through from its ,top to thetop cf said recess and an internally screw-threaded.

recess 9, which extends only part way from the top Cif/'said plug. A. slantingchannelvor passage y10 connectsvthe lower part of. this v 9 with the top ofgthe Irecess 7 at a point near the lower end ofi channel 8. Said plug is screwtapped :at'a

screw-threaded recess point near its" .top to allow the insertion-of the screw 11 at right angles to and entering into the channel 8. I

12 designates the plunger rod which passes through channelS and is locked in any desired petition by means of the screw `11. `ner desired, in the present instancebeing merely provided .ular intervals,

This rod may be graduated in' any man# with circular inarks at reg; It has for its object to enter the mercury and, being ofmedium size, to

cause the rise .of the mercury in the tube when the rod. is lowered` and-'to cause the lowering ofv the mercury when the rod is partially withdrawn from the tube. it will be seen that by causing the rise and fall of the mercury this rod itself aids. greatly in the adjustment of the thermostat, giving it a very wide range or adj ustinent.

13 designates thevadjusting screw' which the internally screw-threaded recess 9 and the pointl 15 of 'which makes with the mercuryA when a Thus,

been attained, thus forming the circuit. l

The thermostatic device-has therefore a liquid .contactA and j a solid contact whichy close thelelectricl circuit when they meet.

Each of .these isv independent-ly adjustable towardthe otheigin order'thatthe making j Furthermore the screw. 13 takes part inboth of these adjustmentsfor it iio supplies the air-vent which makes the action of pluno'er 12 on the fluid possible, besides positively adjusting` the contact point 15 toward or from said duid. The wire Z) before mentioned'is secured to the upper' end of this screw and around the groove near the lower end of the head of the'sci'ew. It might be secured to this screw of course in any suitable manner. vSo far this screw is old, but it embodies a feature which is thought' to be new. This is the vertical groove 14, extending only as far up and down as the screw-threads, thus allowing communication between the inside of the tube and the atmosphere when the screw is not turned home and preventing the escape of or loss4 of mercury when the screw is turned home for convenience in shipping the article' from point to point or carrying it.

This thermostat may of course be used for regulating a heater system, for giving an alarm or other purposes of a somewhat similar nature and therefore I have thought it best to show the thermostat by itself, with itsbattery and the two wires of the circuit, but no particular device to be operated, for it makes no dilference what it operates. l

The mercury in the tube extends to nea-r the top thereof (see Fig. 2).

In the modification shown in Fig. 4 the air vent 16, extending through the side of plug 5 from the' lower end of the screwthreaded recess 9 takes the place of, the groove 14 and is closed in the same way,

that is,'by turning the screw tightly home.v

The operation is as follows: Say the device is adjusted to work or to close the circuit at SOdegrees in the drawings. lVhen that temperature is reached the contact of point 15- and the mercury will take place closing the circuit and operating the apparatus which iteontrols. If it be desired to adjust the thermostat to close the circuit at 70' degrees, the screw 11 is given about half a turn and the plunger is lowered one `mark when the screw is again tightened to lock the plunger rod in place. This forces the'rod farther' down into the .mercury in the tube and necessarily causes a Vhigher level of the saine. Ot' course itwill not have to expand so much to form a contact with the point 15. If on the other hand it be desired to adjust the thermostat to form a circuit at 90 degrees the screw 11 is given a half turn and the plunger is ywithdrawn one mark when the screw is again tightened to lock the plunger rod in place. This action of course withdraws the rod one mark from the former position in the mercury and necessarily causes a lower level of the same, thus it will have to expand more to make the contact.

The screw 13has of course a fair range of they both might be adjusted to their widest range, but it is quicker to adjust roughly by one and then'to adjust finely by the other and as said before it gives a very wide range of adj'ustability.

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

In a tliermostatic device forming part of an electric circuit, a receptacle for containing conducting fluid, in combination with a plunger for mechanically raising or lowering the level of said Huid at will, a closure for said receptacle having a bore through which said plunger moves, also a threaded passage in the closure leading to the interior of said receptacle and a screw engaging the threads of said passage for adjustment and having at its lower end a contact point which enters said )assage and may be adjusted up or down tierein, this` screw being also provided with an air-ventI groove substantially as set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

l v JULIUS BOEKEL. Witnesses JOHN H. Scimmia, F. MANGOLD.

Images