US2110804A - Raking device for furnace grates - Google Patents

Description

arch 8, 1938., E. LUDI ET AL BAKING DEVICE FOR FURNACE GRATES mmsm 2 Sheets-Sheet 1 Filed July 29, 1936 March 193. E. LUDl' ET AL BAKING DEVICE FOR FURNACE GRATES Filed July 29. 1936 2 Sheets-Sheet 2 Patented Mar. 8, 1938 Ernst Ludi,- Solothurn,

and Justus Burger,

Zurich, Switzerland; said Ludi assignor to said Burger Application July 29,

1936, Serial No. 93,258 V In France August 10, 1935 2 Claims.

The invention relates to a raking device for furnace grates and more particularly to the class of raking devices comprising rows or series of rake-blades adapted to enter between the grate bars and means for moving the blades .up and down, so as to loosen the fuel and bring the cinder and the ashes through the grate.

One object of the invention is to provide a new and improved raking device of the class set forth which is simple and durable in construction and easily manipulated to insure proper raking of the fuel and to bring down the cinder without loss of fuel.

The invention consists of novel features and parts and combinations of the same as will be fully described hereinafter and then pointed out in the claims.

Several practical embodiments of the invention are shown in the accompanying drawings forming part of this specification in which similar characters of reference indicate corresponding parts in all the views.

Fig. 1 is a sectional elevation of the fire box of a furnace with the improvements applied.

Fig. 2 is a sectional elevation on line II-II of Fig. 1,

Fig. 3 illustrates a raking blade of modified construction in a, plan view.

Figs. 4 and 5 show a modified construction in 30 front elevation and in a ground plan respectively.

Fig. 6 illustrates a modification of the device shown in Figs. 4 and 5, in a front view and showing the interconnection of the blades.

Figs. 7 and 8 illustrate a further embodiment of the invention in front elevation and in a ground plan respectively,

Fig. 9 is a front elevation of a modified arrangement of the blades with reference to each 40 other.

The fire box B of the furnace is of the usual construction and may be of any size, the improvement is adapted for use in connection with a variety of furnaces. Grate bars 8 of suitable 45 cross-section are arranged in the lower portion of the furnace. In the ash pit P under the grate bar 8 a shaft l is rotatably mounted in bearings 2 and 2' arranged on opposite ends of the grate and running in the middle of the grate.

50 On the shaft I toothed blades 5 are arranged one for each opening between two consecutive grate bars 8. Each blade 5 comprises two wings BI, 82, the upper edges of which are provided with teeth 83, 84 of varying size. The outer edges 55 85 are serrated. The dimensions of the wings are such that each of the two wings cleans one half of an opening between two grate oars. By rocking the shaft i one or the other of the wings BI, 82 enters the corresponding grate opening, all the teeth 83, 85 may be brought topass over the upper face of the grate and to enter the fire bed to agitate the fuel on the top of the grate and to readily cut any clinker that may rest in cakes on the grate. The blades 5 are provided with holes 12. When the blades 5 pass into the fire bed, pieces of clinker pass. into the said holes l2 and are brought down into the ash pit by the reversal of the blade movement. The shaft l is of square cross-section, each blade 5 is held between two adjustable set-rings 3, 4 fixed to shaft I by set screws. To rock the shaft l a crank-handle 9 is provided which is removably fixed on the shaft i and which is outside the fire box. The blades 5 are wholly below the grate, some teeth 83 being the only parts of the blades that extend through or into the grate. The blades 5 do not hinder the ashes from falling through the grate into the ash pit, moreover they do not prevent the access of air to the fuel on the grate and reach not into the red hot fuel. The serrated faces of the blades 5 and the holes l2 thereof engage clinkers near the ends of the grate openings and tear it down into the ash pit.

In Fig. 3 a modified construction of the shaped element is shown. The blade l4 comprises two wings which are in one line and which have a straight upper edge on which the teeth are arranged. A row of holes [2 is arranged near the upper edge. The dimensions are such that the teeth do not project above the grate 8, if the blade is not in operation. When. the latter is rocked only one side of each blade l4 enters the fuel. The two sides of the grate are worked one after the other.

The construction shown in Figs. 4 and 5 comprises two shafts 20 and 2| running parallel to each other and being arranged near the side walls of the fire box. The blades 22 working in the openings of the grate 8 are alternately attached to the shafts 20, 2|. Each blade 22 is located under a gap in the grate. The upper edge of each blade 22 is provided with teeth adapted to brake through the cinder or slack. In each blade a row of holes I2 is arranged. On each shaft 20, 2! an arm 35, 3! is rigidly fixed. The arms 35, 3| are interconnected by the rod 25. To the square ends of the shafts 20, 2| the crank lever may be attached and by turning one of the shafts 25, 2! the other will be rocked. The blades 22 enter the gaps in the grate alternately. In the position of rest, the blades 22 are well within the gaps and well below the grate surface, leaving sufiicient space for the air to enter the bed of fuel.

In Fig. 6 a modified construction is shown. The shafts 2|, 2| are interconnected by a rod 21 which is linked to the arms 33, 34, projecting on different sides of the shaft. In each gap of of the grate a blade 26 of the shafts 20, 2| is arranged. The blades are only half the length shown in Figs. 4 and 5. By rocking done by the shafts 20, 2| the blades 26 go up and down simultaneously. The blades 26 are each arranged with a plurality of holes l2 working in the manner aforesaid.

A still further construction is shown in Figs. 7 and 8. The blades 28, 28' are arranged on a common shaft l arranged below the bar 8 in the ash pit. The blades 28, 28' are well below the grate surface. The upper edges of each blade is provided with teeth and each blade is provided with a plurality of holes I2. Consecutive blades 28, 28 work on the right or left hand side of shaft Each blade 28, 28 works only one side of the grate.

In Fig. 9 blades are arranged on a common shaft l which runs in the centre of the grate 8 and well below it. The blades 35 are provided on two opposite edges with teeth, moreover several rows of holes |2 are arranged running concentrically to shaft By rocking shaft the one or the other edge is brought in engagement with the gaps of the grate 8, as shown by broken lines in Fig. 9. In all the cases the holes l2 bring down the cinder into the ash pit.

What we claim is:

1. In combination with the grate bars of a furnace, blade shaped elements oscillatably mounted below said bars in alignment with the spaces between the bars, the upper edges of said blade shaped elements being formed as a series of inverted V-shaped teeth, said blade shaped elements having clinker receiving holes for purposes described.

2. In combination with the bars of a grate, of at least one shaft rockably mounted below the bars, an actuating device for said shaft, and raking blades carried by said shaft and aligning with the spaces between the grate bars so that upon actuation of said shaft said blades. may be raised through the spaces between the bars, said blades having their active edges provided with sharpened serrations and having a set of clinker receiving holes adjacent said serrations for purposes described.

ERNST LUDI. JUSTUS BURGER.

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