US990237A - Damper-regulator. - Google Patents

Description

R. J. DAVIS, DAMPBR REGULATOR. APPLICATION FILED JAH. 3, 1910.

f 990,237. Patented Apr25,1911.

4 SHEETS-SHEET 1.

R. J. DAVIS. DAMPER REGULATOR. APPLIOATION FILED JAN. a. 1910,

Patentld Apr. 25, 1911.

4 SHEETS-SHEET 2.

R. J; DAVIS. DAMPBR REGULATOR. APPLIUATIUN IILED JAN. 3, 1910.

Patented Apr. 25, 1911.

4 BHBBTBSHBBT 3.

R. J. DAVIS. DAMPER REGULATOR. APPLIUATION rILBD JAN. 3. 1910.

Patented Apr. 25, 1911.

{SERBIE-SHEET 4.

ROBERT d'. DAVIS, OF CHICAGO, ILLINOIS.

DAMPER-REGULAT'OR.

Specification of Letters Patent.

Patented Apr. 25, 19M.

Application filed January 3, 1910. Serial No. 535,945.

To ali 'whom fit may concern:

Be it known that l', ltonnn'r J. DAVIS, a

- citizen of the United States, residing at Chicago, in the county of Cook and lState of Illinois, haveinvented certain new 'and useful 4Improvements in Damper-ltegulators, oi which the following is a specification.

This invention relates more particularly but not necessarily to improvements upon the damper regulator of the particular type shown-and described in my application for United States Letters Patent, Serial No. 450,882, filed April 29, 1908, to which ret'- erence may be had for an understandinp,l o any feature common to the two devices which are shown herein but not described in detail, and the primary object ot' the present invention is to provide improved means whereby varying degrees of adjustment of the amper .may be obtained and the damper maintz'lined in its adjusted positions. f

A further object is to provide an improved device of this character which will be simple, durable and cheap in construe tion and effective and etl'icient .in operation. To the attainment of these ends and the accomplishment of other new and useful objects, as will appear, the invention consists in the features of novelty in the construction, combination and arrangement of the several parts hereinafter more fully described and claimed and shown in the accompany/'ingl drawings illustrating an embodinicnt of the invention and in which-- Figure 1 is a' side elevation, partly in section, ot' an improved apparatus ot this character constructed in accordance with the principles of this invention and showing the damper adjusting),` means in one position in t'ull lines and in another position in dotted lines. Fig. Q is a detail elevation of a portion of the apparatus showing' the same in two positions, one in full lines and the other in dotted lines. Fig. f3 is an en largcd detail sectional view on line iti-3 of Fig. Lt. Fig'. 4 is a top plan view of Fig. 3. Fia". tis a diagrammatic view showing' the `contacts and thc electro-responsive devices.

Fig. is a view of the regulating lever. Fig. `7 is a diagramnuitic view showing the circuits. Fig. S is a detail perspective view of (me ofthe armatures and catches which are controlled by the electro-responsivti fdevic, s.

ings and in the present exemplificationof the invention, the support for the operating mechanism preferably comprises two spaced plates l() and 11, which are held spaced from each other in any desired or suitable manner, preferably by means ot' spacing members 12 arranged at convenient points between the plates and which are connected by their extremities to the plates in any Suitable manner. Jonrnalcd adjacent each extremity of these plates or supports and extend` ing transversely thercacross are shafts 13, lfl, to which are respectively secured sprockcts l5, 1G, by means ot' suitable ratchet mechanism comprisinga. dog 17 which cooperates with a shouldered portion 18 on the shaft and which dogs are held in position to engage the shoulders by means of suitable elastic members 2t), such as springs or the like. This ratchet mechanism will perniit the respective sprockets 15, 16, to rotate freely about the respective shafts 13, l-fi in one direction but when the sprockets are rotated in the opposite direction, the ratchet mechanism will lock the sprockets -to thc shafts so that the shafts will berotatcd by the sprockets.

The shafts 13, 14, are of a length to project beyond one of the plates or supports comprising' the frame, preferably the front plate or support 10, as shown more clearly in VFigs. l and at, and secured respectively to the projecting extremities of those shafts arc arms 21, 22 and these arms are pro vided with a slot'll through which the extrcmity of the respective shafts project and a fastening device is secured to the end of the sha'lts ior preventing displacement of thc arms. The slots E2C-'l permit the arms to be adjusted laterally with respect to the sha tits so as to vary the movement of the damper4 ,in a manner which will bc presently set forth. The arms are respcctivcly provided with laterally projecting pins or extensions 2i, Pivotally supported by one of thc projections, pretcrably the projection Q5, on au ojwratirug lever QG, the body portion of which provided with an elongated slot 27, which extends sulistantially the entire length of the lever. The other projection Q4 on the arm 21 extcnds'into the slot 2T so that the lever QG may be freely moved longitudinally with respect to the pin or projection 24 when the arm 22 is rotated, so that the projection 24e will serve as a fulcrum by the arm 2Q is by means of the apertures 23 anda hookedv extremity, is a llexible member 29 preferably in the form of a chain or the like.'

The apparatus thus far described is preferably supported from an overhead support 30 such as the ceiling of a room by means of suitable hangers V31. The other extremity of the iiexible member 29 is connected to the door or damper 32 of the furnace 33. A similar flexible member 34 is connected by one extremity to the lever 26 by engaging in any one of the apertures on the opposite Side of the lever. This flexible mein'- ber 34v is preferably arranged so as to pass over overhead pulleys 35 preferably secured to the support 30 and the free extremity of the flexible member is connected toa damper 36 of the furnace.

From the above it is thought that this im` proved construction Will be clearly understood, and with the mechanism thus far described itis thought, that the operation will also be clearly understood but briefly stated it is as follows: Assuming the parts to be in the position shown in full lines in Fig. 1, and motion is imparted to the shaft 13 'to rotate the latter, the arm 2l will be rotated and will raise the lever 26 from the position shownv in full lines tov that' shown in dotted lines. During this raising move'- ment, the lever will rock about its point of connection 25 with the arm 22 as a fulcrum, and it will draw up on the lexi ble member 29 to further open the door Aor damper 32. Att-he same time tension will be releasedfon the flexible member' 34, which Will permit the damper 36 to close by the Weight of the damper and the portion of the flexible member between t-he damper and.one of the pulleys 35. Assuming the parte to be in the position shownin full lines in Figs. 1 and 2, the operation will be the same with this exception, hat if motion is imparted to the arm 22 instead of the arm 21 thelateral projection 24 on the arm 21 will'serve as a fulcrum for the lever 26 and when the arm 22 is rotated, the lever Will 'be moved about the fulcrum 24 to rock the lever from the 'position shown in full'lines in Fig.' 2 to that shown in dotted lines in the same figure.

This movement of the lever will release they tension ion the flexible member 29 and per-l "init the damper or door 32 to close by the Weight 'thereof and at the same time will` dravv Aupon y'the ilezrible member 34 to open lthe damper "t'trill therefore be apzvpar-A ent that the dampers *32, 36, may be adjusted to varying degrees and maintained in their adjusted positions according to which of the arms 21, 22 is rotated. The rotation of these arms 2l, 22 is controlled entirely by the temperature of the room to be heated and in a manner as Will be clearlysetfforth.

- The arms 21, 22-maybe rotated in any suitable manner but are preferably rotated and operate in a manner similar to the operation' of al gravity motor and for this , purpose weights 37, 38, are provided, one

for each of the sprockets 15, 16, and these weights are operatively connected with the respective sprockets. by means vof flexible members 39, 40, preferably in the form Aof chains or the like, one extremity 4of each of which is secured to one of the Weights and the body portions of the chains or flexible members pass over the respective sprockets -15, 16, as shown diagrammatically in Fig.'

3. The chains also pass respectively through guides 4142, which are preferably held in position between the supports 10 and 11 by means of the connecting members -12, as

shown more clearly in Fig. 3 and. secured to the flexible members are stops 43, 44, preferably in the form of rings or the like. These stops 43, 44 are adapted to respectively engage the guides 41, 42, when the ` Weights 37, 38 are respectively adjacent the limit of their downward movements. so as to stop the shafts 13, 14, at predetermined positions to prevent the completion of the current through the electro-responsive de` vices to prevent the operation of the motors and in this manner thestops 43, 44 seiweas' circuit breakers in the manner which 'will be set forth.

The shafts 13, 14may be controlledin anyv desired or suitable manner, so that the Weights Will -impart intermittent rotation thereto and for this- purpose arms 45, 46 are secured respectively to the shafts n 13, 14. Each of the arms is secured t-o the respective shafts intermediate its extremities and its extremities are preferably flattened as at 47, 48, shown more clearly in Figs. 1 and 4. Locking dogs 49, 50 are respectively provided for the arms 45, 46, and are pivotally supported on thex main supporting members of the mechanism. 4G, and their respective locking dogs 49, 50, is arranged adjacent the outer' face of each of the supports 10, 11, so that the mechanism may be compactly arranged and at thesame time means may be provided'for controlling the rotation of the respective shafts. Each of the dogs 49, 50 is provided with a toothed portion 51, as shown more clearly in Figs.

One of these arms 45, l

1 and 3', which portions are preferably in the form of segments and an arm 52 provided tion 53 thereof will' engage the respective tation.

lto release the arms 52 the tendency of the be compa ctly arranged.

toothed portibns'51 of the arms. These arms 52 are provided for controlling the movement of the locking dogs 49, 50, and

a catch 55 is provided for each ofthe arms 52 and is so arranged that when the respective locking dogs 49, are in engagement with the respective arms 45, 46, the freey extremities of the harms will been aged by lthe respective catches to lock t e respectivev shafts 13, 14 against ro- When the catches 55 are shifted respective Weights 37, 38 will be to rotate the respective shafts 13, 14, which in turn tend to move thev arms 45, 46 against the tension of the dogs 50 and the dogs 50 will in turn'move the arms 52 through the medium of the connections 51,53, so that the shaft will rotate the' movement of the dogs permitting the arms to escape. As soon as the dogs 50 move out of engagement with the respective arms 45, 46, the dogs will be immediately returned to their normal posit-ions after the ends ofthe arms have passed out of engagement therewith by the Weight of the arms 52 and in positions to be engaged and retained by the catches 55.

Any suitable means may be provided for controlling or shifting the catches 55 and for this purpose electro- responsive devices 56, 57, are provided. These electro-responsive devices are preferably in the form of magnets, as shown more. clearly in Fig. 3 andare arranged in pairs ,and supported in any desired or suitable manner, preferably vby means of insulating material |58 held in position by means of the supports 10 and -11 and in such a position that the electro-- responsive devices will stand between the shafts 13 and 14 so that the mechanism may Coperating with these electro-responsive devices are armatures 59, 60, to `which the catches 55 are respectively connected, so that when one or the other pair of electro-responsivc devices is energized, the respective armatin'e will be attracted and this movement of the armatro-responsive devices may be denergizedY -befere the arms 52 reach their normal pos1- tion or positioned to hold the dogs 5() in operative positions with relation to then' `respective arms 45, 4.6. in which event, the

catches will yield to the arms52 as the latter reach positions to be engaged and held by the catches, this yielding movement being permitted by means of the elastic members 61. t i

The speed of rotation of the shafts 13, 14.

force, as will be clearly understood.

is controlled by means of suitable governors which preferably comprise weighted members 62 which are secured for-pivotal move? `13, 14. The weighted members 62 are supported for rotation within a housing 66.

which forms an annular wall and the weighted members are provided with gripping surfaces 67 which are thrown out into engagement with the wall 66 by centrifugal The gears are preferably mounted loosely upon the respective shafts 13, 14, and in order to permit the free rotation of the gears with relation to their respective shafts in one direction and to lock the gears to the shafts when the gears are rotated in the opposite direction, suitable locking mechanism may be provided, preferably in the form of a dog or cam 68, which is pivotally snpported as at 69 upon the gear '65 and is adapted to be forced into engagement with a portion of the respective shafts 13, 14, preferably by means of an elastic member 70 in the form of a spring. rl`his independent motion of the gear 65 is provided in order that the mechanism will notbc jarred by suddenly arresting the descent of the weights 37, 38, and also permits the governor to gradually stop as the momentum of the governor tends to rotate the gear 65 after the shaft 13 has been stopped.

Secured to cach of the shafts 13, 14, is a sleeve 71, 72. The sleeve` 71. is provided with'laterally projecting pins 73, 74, and the sleeve A72 is provided with corresponding pins or projections 75, 76. Supported by the support 5S is a common contact 77, shown more clearly in the diagrannmitic view in Fig. 5. This contact 77 projects beyond each side of the support 58 and its extremities 79.171), terminate respectively adjacent the sleeves 71, 72, and in such vpositions that when the respective shafts V13 14, are rotated a sullicient distance. the respect i\' l j'n'ojections 73. 75, will engage the extremities 7S, 79. of tlnl contact 77. These extremities of the contact are jn'e'l'erably flexihle so as to vicld to permitI the pins or projections to pass butl are sutliciently stiti' to form a good contact for th circuit. Sccnrcd also to the supports 5S are contacts 80, S1, onev of which projects beyond each side of the support and are respectively parallel with and located profi lably in the .same plane with the extrel'nities 78, 79 of the contact 77. These contacts SO, S1 also terminate respectively adjacent the sleeves 71, 7*., so as to he engaged res|wctively by the respective -sleeves are preferably arranged so as to be disposed in opposite directionsv from each other, that is, so that Whenfone of thepins on the sleeves is in engagementv with its respective contact, the ,-other*l pin on the same sleeve Will be out of engagement With .its contact. Contacts 82, 83 are also secured to the support58 xand are arranged to project beyond opposite sides thereof. These contacts are preferably spaced above or arranged in a higher plane from the plane of the contacts 78, 80, and 79, 81, and are preferablyslightly longer than-the adjacent contacts. The extremity of the respective contacts 82, 83 engage and rest .upon the respective sleeves/71, 72, which lattei` are insulated by suitable insulating material 84 from ythe crespective shafts 13, 14.

The electro-responsive devices 56 are connected in series and one end of the Winding is connected as at'85 to the contact 83 and the other end of the winding is connected as at 86 to a binding post 87. Th.- electro-responsive devices 57 are also connected in series and one end of the Winding is connected as at 88 to the contact 82. The other end ofthe winding is connected as at 89 to binding post 90.

These electro-responsive devices 56., 57

are controlled by means of thermostatic bars 91, 92 which are secured together to operate in unison and the free extremity of these bars are adapted to move respectively between contacts 93, 94 and 95, 96. One of the contacts, preferably the contact 93 of the 1 thermostatic bar 91 is connected by means of a conductor 97 to a binding post 98 which Y in turn has connection with the contact 80. The contacts 94,96 are lelectrically connect ed and are in turn connected by means of a conductor 99 to a binding post 100, which latter has connection With a contact 77 and the ends 78, 79 thereof. The other Contact 95 of the thermostat is 'connected by means of a conductor 101 to a binding post 102, which in turn is-e'lectrically connected With the contact 81.- The thermostatic bar 91 has connection by means of a conductor 102 to one side of a battery cell 103 and the binding post 90'is connected to the other side ofthe `cell by means of a conductor104. The other thermostatic'bar 92 is connected by means of a conductor 105 to one side of a battery cell l06and the binding post 87I is connected by means of a conductor 107 to the other side of the battery cell 106. The specific construction and operation,

however, of these thermostatic bars 91, 92,-

forms no part of, the subject matter of the present invention, but the subject matterA of my application Serial Nor/495,902, led May 4, 1909. Suffice it to say that when the tem-I4 I quently the do '49. This will stop the rotation o perature 1in the room to be heated increases or decreases, the thermostatic bars Will move respectively into and out Aof engagement of its .coperatin contact points' `to energize the correspondgmg electro- responsive devices 56, 57. These thermostatic bars are set so' as to operate on slightly different temperaturesA and are arranged preferably'vvithin 'a casing 108 (see Fig. 1) Which is secured or supported by means of the Wall 109 of the room so that the conductors may be loc cated Within the Wall usual manner. lv.

"Assuming the thermostatid bars as shown in diagram in Fig. 7 to be in the position as shown in full lines, the pin 73 on .thel sleeve 71 in engagement lwith the contact 78 and the Weights 37, 38'elevatedftd the full linposition as shown in' 1,;and a variation of `the temperature of the room occurs the operation-*Will becs folljWs: If the temperature of the in the ordinary and `porn decreases, the'th rmostatic barl 91 Wil move from the positi n i shown in full lines in diagram in Fig. 7 to the position shown in dotted lines which will complete the circuit through the el ctroresponsivey devices 57 by means of the fol-` lowing path; from oneside of the battery cell 103 through the conductor 1023, thermo` static bar 91, contact 94, conductor 99, binding post 100, contact 78, pin 73, sleeve 71, Contact 82,conductor88, through the electro-responsive devices 57, conductor 89, binding post 90, conductor 104, back to the other-side ofthe battery cell 103.,v As soon .as the circuit is completed in this'manner,

the electro-responsive devices `57 will be energized and Will attract the armature 60, thereby shiftingr the catch 55- and `releasing the arm 52. When the arm52 is thus released, the Weight 37 will valso be released and will start to descend. As the weight descends, the shaft 13 will be rotated as in the manner already set'forth. The instant the shaft 13Vstarts to rotate, the arm 45 Whichis secured thereto and which has been released Will pass out of engagement vwith the dog- 49 and the moment the extremity of the armapasses the dog', the gravity of the arm 52 will move the dog 49 into the'path of movement of the 4other extremity 47 bfwthe farm 45 so as to be engaged by the arm to arrest the movement;- of the shaft 13. Just a's soon as the shaft 13 commences .to rotate, the pin 73 will pass out of engagement with the contact 78 and thereby break `the circuit through the electro-responsive devices 5.7 which Will dexier 'ze the latter. The elastic member 61 wil then move theA armature 60 to its-normal position `to set the catch .55 to lock-the arm l52 and conse 49.l This operation takes' place beforeapt 'e 3-other,j extremity of the y arm 45 reaches a position to engagclthellot e s a 13 and arrest the descent of the weight 37, thejar caused by the sudden arresting of the weight being taken up by means et' the governor and the loose connection between the gear 65 and the shaft 13 in the manner already fully explained. ,Assuming the parts to be in the initial position as above set forth and if the ten'iperatnre of the room increases the thermostatic bar 92 will move into engagement with contact 9G to control the circuit from the battery 10G through the electro-responsive devices 56 in a similar manner.

The pins 7 Tet, on the sleeve T 1 and also the pins T5, 76, on the sleeve 72 are so arranged with respect to each other and with respect to the arms L15, 4G, that when one of thepins moves away from its Contact, the other pin will be in engagement with its respective contact when the movement of the sha't't is arrested, so'that when the temperature in the room varies to such anextent as to cause the thermostatic bar 91 to move into engagement with the Contact 93, the circuit will be again completed through the electro-responsive devices.57 to still 'further adjust the dempers.

'lhe operation just above described applies equally as well to the thermostatie bar 92 and the electro-responsive devices 56.

'ln order to brealt the circuit through the mechanism and to render the mechanism inoperative when'the weights 37,38 approach the limit ot their descending movements, the stops 43 and it-1# are provided. rl`hesestops are so arranged that just as ,the weights reach their limits, they will engage the guides or stops 41. 42, and thereby stop the rotation oi the shafts.l 13, 111-. These stops 43. 4t. are .also so arranged that when the respective shafts 13, 14, are arrested` b v 'the engagement 'ot the stops with the guides. #,l-l. 42, the pins 73, 74, on the sleeve 71, and the pins 75, 7G on the sleeve 72 will be held ont ot' engagement with the contacts 78, S0, and 79, 81, so that in the event ot' the operation ot' the thermostatic bars 91, 92, with the parts in the position above described, the energizatien ot' the electro-responsive devices would .not set the mechanism in oj'ieration and the parts will thereby he protected.

The point of attachment ot the llexible connections Jfrom dratts 32, 3G. to lever 2G may be made at any one ot' the series ot points Q8 along lever 26 so as to render the drafts more or less open when in the intermediate position in order that sutlicient air may be admitted to thetre to maintain a comparatively even tcn'iperatnre and thus avoid a frequent change ot the dralts` to either ofthe other positions.

In order that the invention might be fully understood` the details ot the. 'foregoing embodiment thereof have. been thus specitically described, but

1. In a damper regulator. the ,combination oi a regulating lever, a plurality of shiftable fulcrums with which the lever has engagement. a connection between the lever and the doei' or damper of a heater, mechanism 'tor shifting either of the fnlcrum points to rock the lever about the other fulcrmn point tor adjusting the door or damper. and means operatively related to the said mechanisms for rendering one of the mechanisms activ.l and for maintaining the other ot said n'iechanisms inactive.

2. 1n a damper regulator, the combination ot" a regulating lever. a plurality of shit'table fulcrums with which the lever has engagement. a connection between the lever and a door or damper of a heater, mechanii-'m 'for shifting either of the fulcrum points to rock the lever about the other fulerum point i'or adjusting the door or damper. and electro-responsive means operatively related to the said mechanisms for rendering one ot' the mechanisms active and Yfor maintaining the `other of said mechanisms inactive.

il. In a damper regulator, the combination ot a regulating level'. a plurality of shi't'tahle l'ulcrui'ns with which the lever has engagement, a connection between the lever and a door or damper of a heater, mechanism t'or shitting either ot' the tulcrum points to rock the lever about the other fulcrum point 't'or adjusting the door or damper, and means controlled by the temperature of the room nml-operatively related to the said mechanisms for rendering one of the mechanisms active and for.maintaining the other ot said mechanisms inactive.

l. ln a damper regulator, the combination ot a regulating lever.' a plurality of shittable tulcrums with which the lever has engagement, a connection between the lever and the door or damper ot a heater, mechanism 4t'or shitting either oi the tulerum points to roch the lever about the other fulcrum ypoint tor adjusting the door or dainper. and means operatively connected with said n'ieehanisms tor automatically rendering one ol tbe said mechanisms active and ttor.nniintaining the other of said mechanisms inactive.

5. ln a damper regulator. the combination ot a regulating lever. changeable fnlcrnms l'or the lever. a connection between the lever and a heater damper or door. mechanism individual to each oi' the t'nlcrums for shifting one ot the t'nlcrnmsl with respect to the other to rock the lever about the said other l'nlcrnm l'or vary'ingathe adjnstment ot' thel door or damperaand meansl common to said mechanisms lor controlling the operation of the latter.

t3. l'u a damper regulator. the combination ot a regulating lever, changeable fulernn'is door or damper, and means common to said for the lever, a connection .between the lever mechanisms and controlled bythe temperature of the room for controllingthe opera.

tion ofthe latten 7. In a damper regulator, the combination of .a regulating lever, a movable support to.

which the lever is pivotally connected, a

' second support for the lever and'with which the lever has a sliding connection, a connection between the lever and a door or damper of a heater, actuating mechanism individual tothe supports for moving one of the latter to rock the lever about the other support as a ulc'rum, and means rforcontrolling the operation of the said actuating mechanism.

'8. ln a damper regulator, the combination lof a vregulating lever, a movable support to which Vthe lever is pivotally connected, said lever being provided with a slot in its body, a second supportfor the lever having a por`- tion projecting into the slot to form a slidingeonnection withthe lever, mechanism' for rotating either of the supports to rock the lever about the other as a fulcrum,a

-connection between the lever and-a door or damper of. a heater, and means controlled by the'temperature of the room for actuating said'lmechanism'to adjust the said door or damper.

9. In e damper regulator, the combination of a regulator lever, a movable support to whichl the lever is pivotalljI connected," a

second support'for the lever and with which,

the lever has a sliding connect-ion, mecha! nism individual to the supports for moving one of the respective supports to rock the lever about the other as a fulcr'um, a. ilexible member connected with a door or damper of'a heater and also with the lever intermediateits points of support, whereby the operation of the lever -will adjust the door or damper, -means whereby the 'point oi? connection of the exible member with the le- `'tion of a'regulating lever, a movable support to which lthe lever is pivotally connected, a second movable support for the' lever and with which the lever has asliding connection, a connection between the lever and a door or damper' of a. heater, actuating mechanism individual to the supports for moving one or" the. respective supports to rock the lever about the other support as a fulcrum, means for controlling the operation of the said actuating mechanismsi means for locking the lever in any oit`4 its adjusted positions, and means tor releasing the lever. -f

1 1. In a damper regulator,'the combination of a pair of shafts, a crank n each of said shafts, a connection between the cranks, said connection permitting a free and independent movement of Veach shaft andferank, a connection between the first said connection and a door or damper of a heater, mechanismi'or moving each crank to adjust the door-or damper andmeans .for controlling the operation of said mechanism.

l2. In a damper regulator, the combina. tion of a pair of shafts, a crank on -each of said sliafts,' a connection between the cranks, said connection permitting a' free and independent movement of each shaft and crank with respect tothe other shaft and crank, a connection adjustably secured to the first said connection and arranged between said connection and the dooror damper of a heater, mechanism for moving each crank to adjust the door or damper, and means for controlling the operationof saidvmechanism. i l I' In testimony whereof I have signed my name' to this specification, in the presence of two subscribin Witnesses, on this 30th day'of December D. i909.

RQEER DAVIS.

Witnesses: J., H. declinar, Jr.,- C. H. Sani/r.

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