US1561311A

US1561311A - Island

Info

Publication number: US1561311A
Authority: US
Publication date: 1925-11-10
Anticipated expiration: 1942-11-10

Description

Nov. 10,1925- 1561311 J. w. CRAIG- DRAF'I' REGULATING DEVICE Filed Dec. 21, 1922 hwtvvvoa JAMtS w. CRMQ Patented Nov. 10, 1925.

UNITED STATES PATENT OFFICE.

JAMES W. CRAIG, OF PROVIDENCE, RHODE ISLAND.

DRAFT-REGULATING DEVICE.

Application filed December 21, 1922.

To all whom it may concern:

Be it known that I, JAMES W. CRAIG, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Draft- Regulating Devices, of which the following is a specification.

This invention relates to an improved draft regulating device for furnaces.

One object of the invention is to provide a device of this character wherein the control of the gases from the combustion chamber may be more efficiently controlled than in the case of devices of this character heretofore used. 1

Other objects and advantages of the invention relate to various improved details of construction and methods of operation as will be more fully set forth in the detailed description to follow.

Referring to the accompanying drawings:

Fig. 1 is a side elevational view of the exit pipe showing the means for adjusting the position of the draft regulator.

Fig. 2 is a vertical sectional view taken along the line 6-6 of Fig. 1, and showing the position of the draft regulator and its associated parts when in normal operative position.

Fig. 3 is a view similar to Fig. 2, showing the relation of the parts when the rod is in position to be withdrawn from the damper plate, and,

Fig. 4 is a detail sectional view, taken along the line 8-8 of Fig. 2.

A pipe 41- from the furnace provides a passage through which the exit gases pass from the furnace, the pipe being provided with a novel form of damper for controlling the flow of exit gases through the pipe.

The damper 42 is positioned in the pipe 41 and rotatably supported by a rod 43 for movement to vary the quantity of exit gases passing through the pipe. Fixed to the outer end of the rod 43 by means of lock nuts 44 or other suitable means is a pointer 44,

while a segmental scale 45, having suitable indicia thereon corresponding with the indicia carried by the shoulder 31, is fixed -to the pipe 41.

The damper42 comprises an outer plate member 47 fitting closely within the pipe 41 and having an opening 48 therein within which fits an inner plate member 49. The inner plate member 49 is firmly secured within Serial No. 608,225.

the opening 48 and to the outer plate member 47, to form therewith what is in effect unitary plate member all parts of which lie in substantially the same plane, by means of suitable fastening devices 50. One or more ports 51 are provided, preferably in the inner plate member, and shutters 52 are pivotally mounted, in this instance upon the outer plate member, for movement over the ports 51 to wholly or partially cover the same, the shutters being each adapted to be secured in any one of a plurality of adjusted positions by means of thumb nuts 53, whereby any desired degree of closure for the ports 51 may be secured. The rod 43, to which the pointer 44 is secured, is surrounded by a coiled spring 55 positioned between a portion of the segmental scale member 45 and one of the nuts for securing the pointer to the rod, which spring constantly acts to urge the rod outwardly from the pipe. The rod 43 is provided with oppositely directed

bends

57 and 58 formed therein adjacent to each other and suitably located adjacent to a depression 59 formed in the inner plate 49 when the rod is in operative position. The outer and inner plate members are formed with struck out

portions

60 and 61 respectively to form a channel for the reception of the rod 43, these struck out portions being in line with the depression 59 above mentioned. The depression 59 extends somewhat farther from the plane of the damper than the struck out portions to permit the rotation therein of that portion of the rod containing the

bends

57 and 58, and shoulders 62 and 63 and are formed in the depression suitably positioned for engaging the

opposite bends

57 and 58 respectively when the rod 43 is rotated into the position shown in Fig. 6 and pressed outwardly by the spring 55. In this position of the parts the rod is held by the shoulders 62 and 63 against rotation relative to the damper so that any rotative movement of the rod results in a corresponding movement of the damper to open or close the pipe to the pas sage of exit gases therethrough. When it is desired to remove the damper the rod can be readily removed by pressing inwardly upon the pointer 44 against the spring 55 until the

bends

57 and 58 clear the shoulders 62 and 63 respectively whereupon the rod can be rotated independently of the damper, and when turned through forty-five degrees, will occupy the position shown in Fig. 7,

whereupon it can be withdrawn from the pipe. ft will, of course, be understood that in assembling the parts the rod will be first inserted in the position shown in Fig. 7 and rotated into the position shown in Fig. 6, whereupon when pressure upon the rod is released the spring 55 will force it outwardly and bring the bends 57 and 55: into engagement with the shoulders 62 and 63 to hold the rod against rotation relative to the damper.

In the use of my improved damper construction I propose to form the inner plate 4-9 of a single standard size and contour for all installations and form a plurality of outer plates of different over-all sizes to lit pipes of varying diameters. Each of the outer plates is formed with an opening 48 properly located and of suitable size and shape to receive the inner plate which Will be of the same size and shape in all cases. It will be noted that the inner plate member is eccentrically positioned relative to the outer plate member, that is, in all sizes of the outer plate member the inner edge of the opening 18 on the rod 43 nearest to the wall of the pipe 41 as indicated by B is always spaced an equal distance from the Wall of the pipe ,ll, whereby the bends in the rod 43 will always occupy the same position with relation to the shoulders 62 and (53 formed in the inner plate member'- regardless of the over-all size of the outer plate member. Thus in all cases except the smallest possible over-all size of the outer plate member, the inner plate member willbe eccentrically located relative to the outer plate member. This construction permits the use of the same rod and inner plate member in any possible installation, the outer plate member being varied in over-all size as desired to fit closely within pipes 41 of varying size. Attention is also called to the fact that in addition to the provision for a graduated basic flow of gases as provided by means of the ports 51 and shutters 52 therefor, the pointer may be rotated relative to the rod d3 by loosening one of the lock nuts employed for securing the same thereon, whereby the pointer may be secured to the rod 43 so that when the pointer is directed the zero mark on the scale damper will either occupy a vertical position in the pipe to entirely close the same, or may be held at any desired small angle from the vertical to secure a suitable basic flow depending upon the particular conditions of basic draft required, that is, in adjusting the basic draft the portsfil maybe set fully open if desired and if the basic draft thus obtained is insufticient the position of the pointer relative to the rod 43 may be varied so that the damper will occupy a position at greater or less angle to the vertical when the pointer is directed to the zero point of the scale. In

this way I am enabled to apply the damper to pipes having a variety of different diameters without the trouble and expense of keeping in stock a variety of complete dampers. By means of this construction I am enabled to furnish dampers in one-fourth inch sizes instead of one inch sizes as has been the case heretofore without the excessive 00st. of carrying the great number of complete dampers which would be necessary to fit thus closely the various pipes now in use. iiIOI'BQVQl', by this means I am enabled to secure more perfect fitting between the damper and the interior wall of the pipe and thus reduce, where desired, the flow of exit gases and secure a wider range of control over the flow of the gases from the combustion chamber. The provision of the ports 51, and shutters 52 therefor permits an extremely delicate regulation of the basic flow of gases, that is, when the damper is closed, and by rotating the damper the flow of gases may be increased as may be desired over the basic flow determined upon after a survey of the size of the furnace, conditions of draft, etc.

The draft regulating means may be set to control the flow of exit gases in accordance with a means for regulating the supply of gases to the combustion chamber. The tie gree of permanent closure of the passage in the pipe 41 may be varied by properly positioning the shutters 52.

lVhile I have shown and described with considerable particularity one form which my invention may assume in practice, I am aware that various changes in the form and arrangement of the parts may be made by one skilled in the art, and I do not desire, therefore, that the descriptive matter herein contained be understood as limiting my invention to the precise form shown and described but it is my intention that the description of the method of positioning and arranging the various parts be regarded as illustrative rather than in a limiting sense.

hat I claim is.:

1. In a draft regulating device for furnaces, a damper comprisin an inner plate member, a rod rotatable in and supporting said inner plate members, cooperating means carried by said rod and inner plate member engageable in one longitudinal position of said'rod for holding said rod and inner plate member against relative rotation, an outer plate member having its external circumference of suitable size to fit within the pipe and provided with. an opening for receiving said inner plate member, and means for securing said inner plate member within the opening formed in said outer plate member whereby said inner plate member may be secured to outer plate members of diflerent sizes while so positioning the cooperating means carried by said rod and inner plate member as to hold the rod and inner plate member against relative rotation.

2. In a draft regulating device for furnaces, a damper comprising an outer plate member provided with an opening eccentrically positioned relative to the perimeter of said outer plate member, an inner plate member fitting Within the opening formed in said outer plate member and firmly secured to said outer plate member, and a rod engaging said inner plate member i'or rotating said inner and outer plate members as a unit whereby the inner plate member may be used With outer plate members of different sizes.

In testimony whereof I have aflixed my signature.

JAMES W. CRAIG.