US917750A - Mechanical stoker. - Google Patents

Description

vcr. A. CALDWELL.

MECHANICAL STOKBR. APPLICATION FILED AUG. 26, 1907.

Patented Apr. 13, 1909.

TH: Manara PETERS 6., wasulNarwN, n. c.

UNITED STA'I JOHN A. CALDWELL, OF MONTGLAIR, NEW JERSEY.

MECHANICAL STOKER.

To all 'whom 'it may concern:

Be it known that I, JOHN A. CALDWELL, a citizen of the United States, residing at Montclair, county of Essex, State of New Jersey, have invented certain new and useful Improvements in Mechanical Stokers, of which the following is a specification, reference being had therein to the accompanying drawings, in which- Figure 1 is a side elevation of the fuel hopper, ram compartment and shovel compartment of an automatic stoker showing a portion of the attached apparatus for operating the Stoker; Fig. 2 a detail side elevation of the parts of the shovel compartment; Fig. 3 a horizontal sectional view of the shovel compartment showing the shovel shaft and shovel therein.

The main obj ect of this invention is to provide a simple means for mounting or su porting the swinging shovel in the shovecompartment so that the same may be easily removed from said compartment for repairs or for any other purpose.

A further obj ect of the invention is to provide a new and improved construction of shovel compartment.

Referring to the various arts by numerals, 1 designates the front wal of the furnace; 2 the fuel hopper; 3 the ram compartment which receives the fuel from the hopper; and 4 the shovel compartment in which is mounted the swinging shovel by which the fuel is distributed in the furnace. The ram compartment is integral with the shovel compartment, and is formed with an opening in its bottom through which the fuel is dropped into the shovel compartment.

In the ram com artment is slidably mounted the ram 5 w ich is actuated by the lever 6 mounted on the rock shaft 7; said shaft being intermittently driven to vibrate the ram. Any suitable means may be provided for operating the shaft 7, but I prefer the mechanism shown in my Reissue Patent No. 12, 598, dated January 22nd, 1907, and I do not consider it necessary to illustrate in detail in this application the ram-operating mechanism.

The shovel-shaft S extends horizontally across the shovel compartment, near the top thereof, and is mounted at one end in a bearing bracket 9 secured to the front wall of the furnace or to the side of the shovel compartment. This shaft extends through the side walls of the shovel compartment, and rigidly Patented april is, 190e.

sensi No. 390,127.

secured to it within the compartment is the shovel 10 by means of which the fuel is thrown through thc fuel opening 11 in the front wall of the furnace. shovel shaft outside of the shovel compartment is a forward extending tappet 12. Mounted in suitable bearings and extending across the front of the furnace, forward of the shovel compartment, is a shovel-actuating shaft 13 which carries tappet-engaging cams 11i adapted to contact with the tappet 12 during the rotation of the shaft 13. Connected to the shovel shaft 3, on the opposite side of the shovel compartment from the tappet, is a lever arm 15 to the free end of which is connected a strong coil spring 16, the other end of said spring being connected to a stationary part of the furnace. The tappetengaging cams 14 may be adjustable substantially as shown in my reissue patent heretofore referred to; and the operation of the parts of the Stoker described is identical with the operation of the parts shown and described in my said reissue patent.

To provide for theremoval of the shovel shaft and the attached shovel from the shovel compartment without disturbing the fuel hopper and the ram compartment, I form the shovel compartment with a removable portion, said removable portion consisting of coincident parts of the vertical side walls of the shovel compartment and a con necting strip by which said coincident parts are secured together, the removable portions of the side walls of the shovel compartment serving as means for holding the shovel shaft in its position.

As shown in Figs. 1 and 2, the lower parts 18 of the side walls of the shovel compartment are made detachable, said detachable aortions being connected together at their lower ends by the bottom 19 of said compartment. rl`he bottom of the shovel compartment is curved on an arc of a circle struck from the center of the shovel shaft. The rear ends of the side walls 18 of the detachable part of the shovel compartment are extended inward and rearward beyond the bottom of the shovel compartment and project downward, as shown clearly in Figs. 1 and 2 to form locking fingers 20. rlhese fingers engage the lower wall 29a of the fuel opening and serve to hold said detachable portion in position at its lower end. The line of division between the lower part of the shovel compartment and the upper part is Secured to the c on a curved line extending from the front portion of the shovel@ ompartment, slightly above the shovel shaft, through the center of the shovel shaft opening to the rear edge of the bottom of the shovel compartment, as shown clearly in Fig. 2. The o )ening for the shovel shaft is formed partly m the removable lower art 18 of the shovel compartment, the ot 4er part being in the upper permanent part of the shovel compartment. The vforward edge of the permanent portion of vthe shovel compartment is formed with a downwardly extending flange 2l which fits within the upper part of the removable portion of said compartment; and the upper edge of the front wall of tho removable cornpa-rtment is secured to said depending flange by bolts 22. It will thus be seen that by removing the bolts 22 the lower portion of the shovel compartment, including the bottom thereof, may be detached from the furnace front and freed from the shovel shaft, whereby said shaft and its attached shovel may be easily removed.

While I have shown the ram compartment as vformed integral with the upper part of the shovel compartment, it will, of course, be understood that the two compartments may be separately made and then properly secured together.

It will be readily understood from the foregoing that the shovel and its shaft may be removed from the shovel compartment without disturbing the rain compartment or the hopper mounted thereon.

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

1. An automatic stoker comprising a shovel compartment having side walls formed with permanent and removable sections, said walls being provided with shovel shaft openings near the top thereof, the side walls of the shovel compartment being divided on a line extending from the upper forward edge thereof through the shovel shaft opening to the inner or rear edge of the bottom, the inner lower ends of the removable parts of the side walls of the compartment being formed with downwardly and inwardly extending fingers adapted to serve as hooks to engage a permanent part of the shovel compartment at the lower edge thereof, and means for connecting the forward edge of the permanent part of the shovel compartment at the forward upper end of the removable part thereof.

2. An automatic stoker comprising a ram compartment, a shovel compartment below the same and in communication therewith, the side walls of the shovel compartment being formed with permanent and removablesections and provided with shaft openings near their upper edges said walls being divided on a line extending from the forward upper edge thereof through the shovel shaft opening to the inner or rear edge of the bottom, the removable lower sections of the side walls being connected by a transverse wall section, a horizontal shaft in the shovel conipartment and extending through the side walls thereof, a shovel secured to said shaft within the shovel compartment, and means for detachably connecting together the forward edge of the permanent part of the shovel compartment to the forward edge of the removable part thereof.

3. An automatic Stoker comprising a shovel compartment having side walls formed of permanent and removable sections, said side walls being divided on the line extending from the upper edge thereof to the inner or rear edge of the bottom of said compartment, a bottom wall connecting together the removable portions of the side walls, means for connecting the forward edge of the permanent part of the shovel. compartment to the forward upper end of the removable part thereof, a horizontal shovel shaft in said compartment, a shovel secured to said shovel shaft within the compartment, the removable section of the compartment serving to hold the shovel shaft in position.

ln testimony whereof l hereunto affix my signature in the presence of two witnesses this 26th day of July 1907,

WM. R. Davis, E. H. H. KAUFMANN.

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