US1157889A - Thermostat-motor. - Google Patents

Description

v COSBY ID. MILLER, :OF ST. JOSEPH, MISSOUBZI, KSSIGNOR :DETBOIT MOTOR APfLIANGE CQMPAN. Y,;,OF DETROIT, MICHIGAN, A CORPORATION-F MICHIGAN. i 1

Specification of letters Patent,

Patented 0a. 26,":1915.

Application filed March 9, 1915. Serial 1i 0. 18,235.

' To all whomit may concern:

Be it known that I, Cosnx iD. LMILLER, a

' citizen of the United States, residing atSt.

' said parts are extremely substantial and are not materially worn, from long and con-' Joseph, in the countyof Buchanan and State of Missouri, have invented certain 'new and useful Improvements in Thermostat-Motors, of which the following is a specification,

reference being had therein to the .accdm-f panying drawing My invention relates to improvements in thermostat motors, the.-'o'bj'ects of which are,

to provide a highly efiicien't mechanism of this class, in which the'form and arrange ment of the parts are ;such, that the number of the parts is reduced to the minimum, that stant use;the reby; providing .a thermostat .I motor that is thoroughly :reliahleLi-n .its op- 'eration, and is extremely cheap in cost of manufacture.

Further objects are, to provide substantial movement limitmg devices, whereby the expansive movement of the diaphragms is limited, thereby preventing over expansion and consequent injury to thediaphragms, such as fracture of the same {or opening of the joint at their edges.

Still further objects are to provide ready securing meansior easily and quickly securing the motor to a fixed object, in operative position, and also, to provide aconnecting device, whereby the motor can be connected with other mechanisms, for thermostatically operating the same, withperfec't freedom inf movement, other than spring resistance, until the expansive limitof the diaphragms is reached.

' tion, similar to showing the thermophragms.

I attain these objects the mechanism illustrated in the accompanying drawings,- v in which Figure -1 is a vertical section of the motor on the line X seen in Fig. 2, showing the thermostat contracts Fig. 2 is a top of the parts seen in ig. 1. Fig. 3 is a secextremelyedge 2. Said portion 2 snugly fits inside of portion .1, with said edges 2 and 1" forming a channel between them, which is filled with solder 3, thus forming a liquid tightjoint, that is not affected by expansion and contraction of said diaphragms as heiremafiter described. Diaphragm 2 has filling aperture 2 formed-therethrough, through which terminates in the inwardly extended which a volatile liquid L is passed, until the space between said diaphragms is filled with said liquid. Said filling aperture then closed with solder 2. I Said diaphragmsare preflerably formed of die stamped spring stee Bottom spring 3 and top spring 4 are of the same shape and size, and for use on diaphragms of ordinary size, as :sh'owm said. springs are made in the form of .a cross, each vhaving the four radially extended arms 3 and 4 'nespectively, while for use-on larger diaphragms, a greater plurality of said arms may be used. Said springs each have a central aperture 3"" an'd 4, respectively formed therethrough. Each one of" said ams has a clip aperture '3 4, re-. spectively formed through their outer ends.

Said springs-and their arms are preferably die stamped from spring steel.

Reduced portion :5. i seat post 5 is through aperture '3 and is headed on-the top I ofgspring '3. Saidjp'ost is provided with screw screwed into a threaded aperture? formed in the lower end portion thereof.

.Said screw has head 6 formed thereon, .for

securing the motor on a fixed object, not

shown. Connection stud 7 is seemed to it, being passed through its a erltnre 4.. Said stud has annular channel "r formed therein, is adapted to receive the bifurcated end of a lever, thus formed, (said "lever being not shownfl or said channel-may he engaged wlth other engageable iorm or movement conveying means, for conveying movemeet therefrom'to-any other various mecha-' d 1 msms, such as dampers, shutters, etc.

thicker The four clips '8 are formed of 'inaterial than said diaphragms, :ifor greater -1'1g1'd1ty, and are preferably die stamped fromfheavier sheet metal clips each have studs 8. formed with; their end porti-ons,said studs being adapted to engage apertures 3 and 1'. Said clips are-first formed of U shape, with their ends farther apart In assembling the parts, springs and 4 are placed in--.the position shown and the studded ends of said clips are crimped into scribedethermostat motor rises, in temperature, liquid L becomes expanded thereby,

' I which causes the parts to move from the po- Fig. 3, if said temperature hast-reached the highest degree in which the motor is desition seen in Fig. 1, to the position seen in signed to, operate. It will be .;seen, that. while in the last mentionedposition, both of the diaphragms are expandedlinto the shapev of arcs by reasen-ofthe expanded liqs uid between them, which is permitted by their annular corrugations 9 and 10, and that their marginal portions by reason of the form, as previously, described are, not' therebyl reduced in diameter. It will alsb be the edges of said diaphragm, and of solder seen that. the described springs and their arms are similarly arced, which slidestheir free ends inward'on said marginal portions, until said inward movement is stopped by oontact'of clips 5 against the'rigid'margin, formed of the previously-describedparts, of

Should said'temp'erature rise still farther, the expansive strain of liquid L against said diaphragm's, thefarther expansion of the latter, and additional strain thereon, are

overcome by the thus held arms and 3 It will be understood that springs. said arms are elastic and together with their respective springs, act as elastic units. The previously described expansion of the thermostat, raises stud 7 .and the lowering of the latter is actuated by said elastic units, when said tem erature is lowered, thereby causing contraction of liquid .L.

Having fully described myinvention, what I'claim as new, and desireto secure by Letters Patent, is

1. A pair of metal disks one disk being above the other; rigid marginal portions formed on the edgesof said disks; liquid tight joining means whereby the edges of said marginal portions are joined for holding a volatile liquid between said disks, the

'latter being adapted to' be ou'twardly;arced byexpansion of said liquid; a top spring on the upper disk; a plurality of top spring members evenly spaced and extending radi ally from said top spring; a bottom spring .beneath the bottom of the lower disk; a like plurality of similarly arranged bottom I spring members for said bottom spring, the

shaped clips ".post; securing means for rigidl ends of all'of said spring ,members being adapted to, slide radially onssaid margin portion off] id disk a plmqality of U' .bnyokiig the ends of said spring membersimpairs; and clip securing means whereby the ends of said clips are-secured to the ends of said spring members, said clips .being adapted to be moved in- Ward against said marginal portion for lim iting inward movement of the ends of said spring members; the whole being adapted to limit expansive arcing of said. die

, phragrns.

2. In a thermostat motor, a pair of thermostat diaphragms holding a liquid between 4 themsaid liquid being adapted to be expanded byheat for .expansively moving and .80 thereby arcing said diaphragms; a rigid an nular margin formed on the edges of said diaphragms; two flat spring units one of which is loosely applied to the outer surface of each of said diaphragms said spring units being adapted to be moved into the form of arcs by said diaphragms; and connecting means extended around said margin whereby the outer extremities of said spring units are connected, saidconnecting means being adapted to .be moved inward by the arcing =ofsaid spring and to have their inwar movementlimited-by contact with said rigid margin; the whole being'adapted to limit the expansion of said diaphragms.

3. A diaphragm motor, comprising a seat securing said post on a fixed object; a at bottom spring unit the centralportion of which is rigidly'secured on the upper end of said post; a pair of expansive diaphragms of disk form resting loosely upon said ottom spring .unit said diaphra ms havin the. edges thereof connected anf holding a fiquid between them that isexpanded by heat; a rigid annular edge portion formed of the edges of said disk; a flat top spring unit resting loosely on the upper one of sand die-- phragms; a plurality of unit 'connect' means whereby the outerextremities of units are connected said connectin means being extended around said rigid edge ortion a slight distance therefrom; a .stud aving its lower end rigidly secured in the central portion of said top s rin unit said stud havin achannel forine in t e a'nnularsurface t ereof; the whole bein adapted to thermostatically move said stu, upward and downward and to limit the movements of said stud.

In testimony whereof I aifix my signature in the presence of two witnesses. COSBY D. MILLER.

Witnesses: I

JOHN J. HrNToN, MATI'HEW B. Hmron.

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