US1114788A - Automatic draft-regulator. - Google Patents

Description

R. P. MERGER.

AUTOMATIC DRAFT REGULATOR.

APPLICATION FILED MAR. 14, 1914.

1,1 14,788. I Patented Oct. 27, 1914 0.4mm. T ,1

j .panying drawings, wherein- 40 Figure 1 is a diagrammatic view illustrat- UNITED STATES. PATENT OFFICE.

RALPH P. MERCER, OF BURLINGTON, IOWA.

AUTOMATIC DRAFT-REGULATOR.

Specification of Letters Patent. Patented Oct, 27 1914 Application filed March 14, 1914. Serial No. 824,698.

To all whom it may concern Be it known that I, RALPH PAUL Mnnonn, a citizen of the United States, residing at Burlington, in the county of Des Momes and State of Iowa, have invented certain new and useful Improvements in Automatic Draft-Regulators, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certainimprovements in automatic draft regulators and has relation more particularly to a device of this general character especially designed and adapted for use in connection with furnaces; and an object of the invention is to rovide a device of this general character ving novel and improved means whereby the draft is under control of a mechanism driven by an electric motor.

provide a devicerof this general character having novel and improved means whereby the operating circuit for the motor is under control of a thermostatic switch.

The invention consists in the details of construction and in the combination and I arrangement of the several parts of my improved automatic draft regulator whereby certain important advantages are attained go and the device is rendered simpler, less ex-' ing a. draft regulator constructed in accordance with an embodiment of my invention; Fig. 2'is a view in side elevation of the operating mechanism as herein disclosed; Fig. I 3 is a view in top plan of the device as illus-v trated in Fig. 2; Fig. 4 is a fragmentary View in top plan, on an enlarged scale, illustratin one of the circuit closers herein em- 7 bodie such closer being shown in open relation; Fig. 5 is a viewsimilar to Fi .4 but illustrating .the closer in closed re ation; Fig. .6 is a fra entarv view in elevation of the brake mec anism herein included; and

Fig. 7 is a, view, detached, of the pin in- 56 cluded in the brake mechanism:-

As disclosed in, the accompanying draw- The invention also has for its object to ings, 1 denotes a furnace ofany ordinary or preferred construction provided with the dampers 2 of conventional form having operatively connected thereto the flexible memhers 3 disposed around suitable guide pulleys or rollers 4 and branching from a main flexible member 5 operatively connected with a crank 6 produced on a shaft 7, to be hereinafter more particularly referred to. The relation of the parts, hereinbefore referred to, is such that when the crank 6 is in.

the base plate 9 and has aflixed thereto a toothed wheel 10 of predetermined dimensions, which wheel is in mesh with a toothed pinion 11 aflixed to the driven shaft 12 mounted in suitable bearings 14 supported upon the base 9. The shaft. 12 has also suitably afiixed thereto the grtooved pulley 15 around which is disposed; the driving belt 16 also directed around the grooved pulley 17 afiixed to a driving shaft 18 of the motor 19, such motor being herein disclosed as of an electrical type.

Positioned at any predetermined locality is the thermostatic switch 20 including the thermostatic bar 21 which plays between the contacts 22 so as to close a circuit, as will hereinafter be more fully'set forth, according as the temperature rises or lowers in the locality in which such switch 20 is arranged. 23 indicates a source of electrical energy connected with the motor-1.9 by the wire a and in connection with the thermostatic switch 20 by the wire. b,.wh1le the contacts 22 are in connection with the circuit closers '24, which will hereinafter be described, by

wheel 10 the upstanding bar or support 25,

herein disclosed as of conductive material and maintained in operative position by the upstanding bracket 26 sultably connected .port 25 and are of a length in excess of the length of the contacts 29 which are also operatively supported by the bar or member 25 but properly insulated, as is indicated at 30, from the contact 28, as is clearly shown in the drawings, and it is to the outer contacts 29 that the wires 0 and (Z are operatively connected.

As disclosed-in Fig. 1,,the circuit to the motor 19, with the upper closer 24 in closed adjustment, would be through the wires a,

b and d, the supporting member or bar 25 and wire e, but, as shown in Fig. 2, it will be observed that the wheel 10 has been sufiiciently rotated by the motor 19 as to brin the crank 6 into a desired position and in w ich' instance, the lower or inner spring contact28 of the upper closer 24 has been freed from the flange or shoulder 27 and thus broken the circuit. It will also be observed from the diagrammatic disclosure in Fig. 1 that with the upper circuit closer 24 in open-position, the shoulder or flange 27 is of such an extent as to have adjusted the spring con tacts of the lower closer 24 into operative engagement so that immediately upon the thermostatic bar 21 engaging the opposite contact 22, the motor 19 will immediately respond, in which instance the circuit will be through the wires 0:, b and 0, the supporting member or bar 25 and the wire 6.

With the stopping of the motor 19, the heavier damper 2 would have a tendency to impart a retrograde movement to the wheel 10, as is believed to be self-evident, but, in order to avoid this disadvantage, I provide the brake pin 31 slidably engaged within the vertically disposed elongated slot 32 produced in the upper extremity of a bracket 33, herein disclosed as operatively connected with a bearing 14 and which is adapted toengage bygravity the teeth of the wheel 10 and thus effectively maintain such wheel against rotation in a directionopposite to the rotation thereof under the influence of the motor 19, it being readily perceived that the elongated slot 32 permits the pin 31 to be disengaged from such wheel-10 upon its proper rotation. While I do not wish to be From the foregoing description, it is -thought to be obvious that an automatic draft regulator constructed in accordance with my invention is of an extremely simple and comparatively inexpensive nature and is particularly well adapted for use by reason 'of the convenience and facility with which it may be assembled and by reason of the effectiveness with which it performs its several functions, and it will also be obvious that my invention issusceptible of some change and modification without material departure from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the recise arrangement and formation of t s several parts herein shown in carrying out my invention in practice. A

I claim:

- In combination with a movable member a device comprising a motor, a source '0 electrical energy, connections'b'etween such source and the motor, a thermostatic closer interposed in the connections, a mechanical closer interposed therein including a shaft.

a flexible connection between the shaft and movable element whereby the same maybe automatically adjusted, a gear wheel mounted on the shaft, a second shaft provided with a gear in mesh with the first mentioned gear, an operative connection between the second named shaft and the motor, 'a slotted bracket positioned adjacent thepoint of engagement between the first named gears, a pin having one extremity slidably engaged within the slot of the bracket and adapted to engage the teeth of the first named gear for holding said wheel against rotation in one direction, an arcuate flange carried by a side of the-first named gear in excess of a semicircle, a supporting bar positioned adjacent one side of the wheel and in spaced relation thereto, circuit closers carried by the bar and diametrically opposed relative to the wheel, each of said closers comprising a pair'of nor- Inally spaced spring contacts, one of said contacts being of a length in excess of the second contact and adapted to be engaged by the flange of the gear.

In testimony whereof I hereunto afix my 1

Images