US962734A - Chain-grate furnace. - Google Patents

Description

A. W. BENNIS. CHAIN GRATE FURNAGE.

APPLIGATION FILED JULY 27, 1906.

Patented June 28,1910;

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EVEN??? A. W. BENNIS.

UHAIN GRATE FURNACE.

APPLICATION FILED JULY 27, 1906.

Patented June 28, 1910.

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ALFRED W. BENNIS, OF LITTLE HULTON, ENGLAND.

CHAIN-GRATE FURNACE.

Specification of Letters Patent.

Patented June 28, 1910.

Application filed July 27, 1906. Serial No. 328,054.

To all whom it may concern:

Be it known that I, ALFRED WILLIAM BENNIS, engineer, a subject of the King of Great Britain, residing in Little Hulton, in the county of Lancaster, in the Kingdom of England, have invented certain new and useful Improvements in and Connected WVith Chain-Grate Furnaces, of which the following is a specification.

This invention relates to improvements in chain grate furnaces, and has for its object to provide a simpler and more eficacious arrangement than has hitherto been the case. In chain grates at present constructed, it has always been found necessary to employ a dumping bar or bridge at the end of the grate, while the feed of the fuel has been regulated by means of a sliding door, the height of which controls the amount of fuel passing from the usual hopper to the grate, In order that the improvements which form the subject matter of the present invention may be more fully understood, reference will now be had to the accompanying drawings, in which,

Figure 1 is a sectional elevation of the furnace; Fig. 2, an end view, with a portion of the grate broken away; Fig. 3 is a plan view of the hinged ash chamber floor and the ash-pit; while Fig. a shows several details of the chain forming the grate; Fig. 5 is an enlarged view of the device forming the side air seal.

In these, a is the revolving chain with the links rounded at their ends as in Fig. 4, or otherwise so formed that on the chain passing around the drums at no appreciable gaps are formed between the individual links and the links do not unduly project the one from the other in this position.

Z) is the usual hopper for feeding the fuel to the furnace.

c is a revolving spider mounted on a shaftc and in a casing 0 in which the shaft 0 is journaled. This spider is revolved by means of a spur wheel or ratchet e acted upon by any suitable pawl mechanism d which can be arranged to engage varying numbers of teeth on the ratchet c according to the number of turns it is desired to give to the spider per minute. The pawl mechanism (Z is operated from any suitable reciprocating rod cl.

f is a depending curved plate hinged at f and counterweighted at 9 so arranged in connection with the spider as to prevent coal other than that which enters into the compartments of the spider from passing to the grate, but capable of swinging away from the spider somewhat to enable any large lumps to pass to the grate.

it represents the doors of the furnace hinged to the furnace front at it. These doors it are provided with spy-holes k normally covered by hinged slides k Toward the back of the grate the usual dumping bar or dumping bridge is dispensed with, and in its place a hinged ash chamber floor 7' is provided hinged to the masonry of the furnace at j. To the forward end of this ash chamber floor are secured chains 70 which pass over suitable pulleys is to winches Z arranged on the front of the furnace. One of these winches Z is provided with a spur wheel m operated from a hand wheel a through a worm n. This winch Z is connected with the winch on the other side of the furnace by a shaft 0 and bevel gearing 0, so that both of the winches will be operated together from the one hand wheel a. The chains is are removably secured to the ash chamber floor 7' at 70 This ash chamber floor j projects at its outer end somewhat under the back roller a of the grate, and is provided with a lip n at its outer end, which in the normal position of the ash chamber floor presses up or just touches the revolving grate. On the ash chamber floor, and on the other side of its pivotal point j is arranged a curved plate 29 which slides along or contiguous to a fixed plate 9 in the masonry of the furnace so as to practically form an air'seal.

Toward the back of the furnace is arranged a channel-iron ash seal 0 to which is secured a plate 8 carrying a hinged depending lip t which rests on the chains of the furnace vertically above the lip c of the ash floor when the latter is in its raised position. This arrangement forms a very effective air seal and prevents air getting to the back of the furnace.

14 represents the girder or sill-plate on which the brickwork w of the furnace is built. The girder is provided with a clownwardly projecting rib or lip a.

w represents the framework or casting on which the usual rollers for the grate are journaled. On this framework on each side is a trough 0 for the rib to dip into. then this trough is filled with ashes a further and very effective air seal is formed for the sides of the grate.

F represents the ash-pit and z the rails upon which the grate can be pulled in and out.

The operation of the device is as follows: Fuel is fed in at the hopper b and allowed to pass in regulated quantities past the spider c on to the grate a. The fuel as it is carried along by the grate a is consumed, and at the end of the grate passes in the form of ashes and clinker on to the hinged ash chamber floor The ash at the same time will be deposited in the ash seal r and also against the lip 21 of the hinged ash chamber floor so as to form air seals for the back of the furnace while ash in the troughs 00 form air seals for the sides of the furnace. This prevents admission of air between the sill plates u on which brickwork is built and the chain grate frame, minimizing the burning away of the sill plates through local rapid combustion. lVhen the floor j is sufiiciently loaded with ash and clinker, it is lowered by turning the hand wheel 72 so as to allow the chains is to wind off the winches Z. lVhen the ashes have been removed the reverse operation is gone through.

If it be desired to increase the feed of fuel to the furnace, the spider 0 is speeded up by causing the pawl device (Z to engage more teeth on the ratchet e on each reciprocation of the rod cl. lVhen it is desired to withdraw the grate from the furnace the chains is are disconnected from the floor j and secured to any suitable part of the grate, and the latter pulled out in ordinary manner.

I declare that what I claim is 1. In a furnace, a revolving chain grate; a hinged imperforate ash-chamber floor with its outer end extending under the lower straight run of the grate; and means for positively holding one edge of said floor up against the under side of said chain grate; thereby forming an ash air-seal between the floor and the under side of said chain grate.

2. In a furnace, a longitudinal chain grate; a hinged imperforate ash-chamber floor, the outer end of which projects under the under side of the lower straight run of said chain grate; and means for positively holding the outer end of said ash-chamber floor against the under side of said grate, whereby the ashes may collect upon the floor and thus provide a seal.

3. In a furnace, the combination with a chain grate built up of links formed with rounded ends; of a hinged ash-chamber floor, the outer end of which in its raised position lies under the under side of the lower run of said revolving grate; thereby forming an ash air-seal between the outer end of said ash-chamber floor and said chain grate; a transverse plate between the two runs of said revolving chain grate; and a depending hinged lip on said transverse plate, said hinged lip normally lying on the upper side of the lower run of said chain grate.

4. In a furnace, a chain grate; a hinged ash-chamber floor; a lip on the outer end of said ash-chamber floor; means for bringing said lip up against the under side of the lower run of said chain grate; a transverse plate between the two runs of said chain grate; a hinged depending lip on said transverse plate, the lower edge of which is lo cated on the upper side of the lower run of said chain grate immediately above the lip on the ash-chamber floor; and a transverse ash-seal secured to the upper part of said transverse plate and located on the under side of the upper run of said chain grate.

5. In a furnace, a revolving chain grate; a hinged ash-chamber floor; a lip on the outer end of said ash-chamber floor normally held against the under side of the lower run of said chain grate; flexible connections secured to said ash-chamber floor; and means for taking in and paying out said flexible connections.

6. In a furnace, a revolving chain grate; a hinged ash-chamber floor; means for forming an ash-seal between the outer end of said ash-chamber floor and the under side of the lower run of said chain grate; means for raising and lowering said ash-chamber floor; a transverse ash air-seal. for the under side of the upper run of said chain grate; a transverse plate depending therefrom; and a hinged depending lip secured to said transverse plate, said hinged lip being located on the upper side of the lower run of said chain grate immediately above the seal formed at the outer end of said ash-chamber floor.

7. In a furnace, a revolving chain grate; a hinged ash-chamber floor adapted when in its raised position to coact with the under run of said grate so as to form an air ash seal; masonry forming the ends and sides of said furnace; an air-seal between said hinged ash-chamber floor and masonry; troughs on the sides of said chain grate adapted to receive ash from the chain grate; and depending lips secured to said masonry at the sides of the furnace, said lips normally lying in the ash which passes into the troughs.

8. The combination of walls forming a furnace-chamber; a carriage movable in the furnace-chamber; a chain-grate mounted on the carriage; longitudinal members carried by the carriage and forming troughs at the sides of the grate to receive ash therefrom; signed my name this 12th day of July 1906, depending flanges carried by said Walls and in the presence of two subscribing Witnesses. entering said troughs; and a hinged ash chamber floor adapted to receive and dis- ALFREDIW" BENNIS' 5 charge ashes from the grate and to prevent Witnesses:

the passage of air behind the grate. RICH. CASTLE,

In Witness whereof, I have hereunto ARTHUR W. SMITH.

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