US1651484A - A corpora - Google Patents

Description

Dec. 6, 1927. 1,651,484

l. A. TAYLOR ET AL ASH DISCHARGE MCHANISM FOR MECHANICAL STOKERS Filed April 26. 1922 2 Sheets-Sheet l I N V EN TORJ TORNEYJ` L; @zo

[y Adr/4 Dec. 6, 1927. 1,651,484

l. A. TAYLOR ET AL ASH DISCHARGE MECHANISM FOR MECHANICAL STOKERS Filed April 26. 1922 2 Sheets-Sheet 2 I )WY Www/mmf:

Patented Dec. 6, 1927.

UNITED STATES PATENT OFFICE.

IRVING- A. TAYLOR AND CARL H. RICH, OF WORCESTER, MASSACHUSETTS, ASSIGNORS TO RILEY STOKER CORPORATION, OF WORCESTER, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

ASH-DISCHARGE MECHANISM FOR MECHANICAL STOKERS.

Application led April 26, 1922.

This invention relates to mechanical stokers and particularly to improved devices for removing` ash and refuse therefrom. Such stokers are now built in very large units having many retorts, and power actuated mechanism is frequently provided for raising and lowering the ashdischarge or dumping plates, as the weight and load have become excessive for manual operation.

These ash discharge plates are, however, concealed under the burning material within the furnace, so that the exact position of the plates is difficult to determine. Under these conditions, it not infrequently happens that the power actuating mechanism is allowed to over-run in one direction or the other, with consequent liability of injur 1 or misplacement of parts.

It is the general object of our invention to provide power mechanism for moving the ash discharge plates in a mechanical stoker, in combination with controlling devices which will limit vthe extent of movement thereof, preferably in both directions. As shown in the drawings, this control is accomplished through electrical connections to a driving motor. Our invention is not 11mited however in its broader applications' to the use of any particular form of driving mechanism or controlling devices therefor.

A further object of our invention is to provide additional manual control of the actuating mechanism, by which the mechanism may be stopped in any desired intermediate position.

()ur invent-ion further relates to arrangements and combinations of parts which willy he hereinafter described and more particularly pointed out in the appended claims.

A preferred form of our invention is shown in the drawings in which Fig. 1 is a vertical longitudinal section of certain parts of an underfeed stokei` of a commercial type;

Fig. 2 is a. plan view of our improved actuating and controlling mechanism for moving the ash discharge plates;

Fig. 3 is a side elevation of the parts shown in Fig. 2;

Serial No. 556,780.

Fig 4 is an enlarged detail perspective viep of parts of the controlling mechanism; anc

Fig. 5 is a diagrammatic view of a systeni of electrical connections for the driving motor.

Referring particularly to Fig. 1, we have indicated certain parts of an underfeed stoker comprising a retort having side walls 10 supporting tuyere blocks 11, an overfeed grate 12 at the rear of the retort, and ash discharge plates 13 pivotally supported on brackets 14 connected to the movable side walls 10 at the rear end thereof. An opening 15 is left between the discharge plates 13 and the rear wall 16 of the furnace.

The plates 13 are supported near their lower ends by rack bars 17 slidable in fixed guide-ways in the stoker frame 1S and having rack teeth on their lower faces meshing with pinions 19 on a shaft 20. The shaft 2O extends transversely under theseveral retorts and is provided with a separate pinion 19 for each rack bar 17.

The parts thus far described are of a usual commercial type and in themselves form no part of our invention. For a further description of the construction and operation thereof, reference is made to the prior patent to R. Sanford Riley, No. 1,322,822, issued November 25, 1919.

As shown in Figs. 2 and 3, the shaft 20 extends through a bearing plate 21 on the outside of the furnace side wall 22 and is provided with a gear 23 meshing with a, pinion 24 mounted on a stud 25 fixed in the plate 21, the pinion having a. sprocket wheel 27 rotatable therewith.

A driving motor 30 is suitably mounted on a base 31 and rotates a screw 32 (Fig. 3) which drives a` worm wheel 33 on a cross shaft 34. The shaft 34 is provided with a sprocket wheel which is connected through a chain 35 with the sprocket wheel 27 previously described. The motor 30 is thus connected through the worm and worm wheel, the chain and sprocket wheel and the spur gearing to rotate the shaft 2O at a lll greatly reduced speed. The motor is of the reversingv type and may be caused to rotate in either direction to raise or lower the plates 13.

lVe will now describe the devices by which the extent ot operation ot' the motor liniited and controlled. A threaded shaft 1.0 is rotatable in bearings all and lf2 on a slate base' /ll secured to the base 3l. ot' the motor 3() between the motor and the cross shaft Slt. The sh att l0 is provided with a sprocket. wheel -t3 connected by z Chain tilto a driring sprocket wheel on the cross shaft 3ft. By these comiectimisj the shaft l0 is rotated in one direction or the other whenever the motor 30 is in operation.

A nut (Fig. 1l) is threaded on the shaft 40 and is provided with upward and downward projections 46 and t?. The downward projection 4t? extends into a slot or groove i8 which prevents rotation oi the nut but permits axial incrementthereot by the threaded shaft dit). rllhe upward projection t6 is positioned to engage Contact arms 419 and at the opposite ends ot' its path oi" mo vementrllhe erm fifi is mounted on a pi it 5l on the non-conducting base and normally en- `rages a post .52 also tired in the hase 4:3. rllhe circuit through which the motor driven in one direction is closed through the arm t9 and the post 52. lllhenever the arm is separated from the post, this circuit is broken and the motor is stopped. The arm 50 similarly engages a post inthe other circuit and the rotation. oit the motor in the opposite direction is stopped by breaking' the circut through these parts.

lVhenever the motor is started in either direction., it will continue to rotate until the travelling nut 45 engages one or the other of the rms 49 or 50 depending' on the direction of rotation of the motor, and thereby breaks the corresponding' circuit. ly suitably proportioning and positioning the parts, the number ot revolutions ot the motor necessary to move the nut trom one end to the other ot its patholt travel may be made to exact-ly correspond to the required ninnber ot revolutions oli' the shaft Q0 to slide the racli bars and move the dumping` plates from raised to lowered position and viceversa` In Fig. 5, we have shown illustrative connections through which the motor may he started and stopped. Push buttons and 56 are provided `tor starting the motor in either desired direction and a third push button 57 may be used to break the circuit and stop the motor at any desired intermediate point. rlhe electrical connections as `diarammatically shown in 5 are as tolowszu i The motor 30 receives power through a power circuit comprising the wires 60, Gl

Leonesa and 62. The main wire 6l is connected through the wire 63 to the normally open switch or button 56 and to the normally closed switch or button 5T. This switch 57 is connected by a wire (Seit to the normally open switch and also to the contact posts F2 and Assuming that the arm fil) engages the post 52 when the switch '55 is momentarily closed, a circuit is then completed `through the wire the :switch 57, a portion of the wire 64, the switch and a wire 65, to a solenoid (itl which in turn is connected by a wire 6'? to the main wire 62. The solenoid attracts a lever 68 which closes a series of switches 69, 7() and 7l. rlhe switch 69 controls a parallel connection through the post 52, arm i 49, wire 72 and a port-ion oi' the wire to the .solenoid 56. rllhis latter connection remains closed after the switch 55 is released and thus keeps the motor in operation. The switches and. 'Tl close the cirf cuits through the main wires 6l and 62 and connections 6l and 62' to the motor 30, the wire (St) being` permanently connected thereto.

When the travelling nut 45 breaks the solenoid circuit by moving the arm 49, the lever tis released and is returned to normal open position by springsr' and the motor is immediately stopped. It at any time the switch 57 is opened, the same cliect will be produced as is produced by movement of 'the arm 49, the solenoid circuit will be broken, and the motor will be stopped.

The operation ot' the remainingf parts or' the control mechanism under the control oit the switch 56 is identical, with the exception that the wires 6l and G2 will be reversely connected to the wires 62 and 6l and that the motor 30' will be rotated in the opposite direction.

The connections above described are illustrative only and in themselves form no part ot' our invention. Any other suitable and convenient controlling devices may be sub stituted :tor those herein shown.

lt will appear from the foregoing description that the convenience and certainty ot operation oi the ash Ydischarge mechanism greatly improved by the invention herein described, as the stolier operator needs merely to push the button 55 when he desires to move the dumping plates 13 to lowered positionand the mecl'ianism will proceed to accomplish this act without tun ther attention, stopping when the plates have reached their1 lowest position. larly hy pushing?,T the button 56, the plates may be restored to normal raised position, also without further attention by the oper ator. y

rlhe position of the*travellingnut in itself forms a convenient indication of the position ot the dumping plates 13 or the nut may Simii fill loo

obviously he very readily connected to any suitable indicating device Jfor giving any other desired visual indication out' the position of the plates 13.

Havingthus described our invention and the advantages thereof1 we do not wish to be limited to the details herein disclosed otherwise than as set `forth in the claims, hut what we claim is l. In a stoler, an ash discharge device mounted for discharginp` and restoring; movements` power means for driving said device, control means ell'ective to automati- |ally stop one ot' said movements and bring the device to rest at a pre-determined point, and means to start the movement of said device at the will ot' the operator.

Q.In a stok-er, pivoted rocking ash discharge plates mounted for discharging and restoring' movement, power means for low ering said plates, and control means effec` tive to render said power means inoperative, and bring' said plates to rest at a pre-determined point in the lowering movement of said plates.

3. In a. stoker, ash discharge plates, power driven means to give said plates a movement to discharge ashes therefrom and a movement to restore said plates to normal position, and controlling means eective to render said power driven means inoperative and bring' said plates to rest at a pre-determined pointl `in each of the discharging' and restoring' movements of said plates.

Ll. In a stoker, ash discharge plates, power driven means to give said plates a movement to discharge ashes therefrom and a movement to restore said plates to normal position, and cont-rolling means effective to render said power driven means inoperative and bring' said plates to rest at a pre-determined point in cach ot the discharging` and restoring` movements ot said plates between the limits oi each n'iovei'nent.

5. In a stoker, an ash discharge plate, one end ot' which is positioned in a plane above the other end, and pivoted near its upper end, a rack bar supportingl said plate near the lower end thereof, a motor, a pinion driven thereby and engagingsaid bar to move said har ilmward and rearward in said stolzer and thereby lower and raise said plate, and means to stop said motor at pre-determined points in the movement of said bar.

In testimony whereof We have hereunto aiiixed our signatures.

IRVING A. TAYLOR. CARL H. RICH.

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