DE56882C - Drum for roasting coffee - Google Patents

Description

IMPERIAL

PATENT OFFICE.

The apparatus shown in FIGS. 1 to 5 for roasting coffee consists of the roasting drum T and the oven O ₁ O ₂ built around the same .

Fig. Ι shows a longitudinal section through the roasting drum and the oven.

Fig. 2 is a front view of the roasting drum and half a front view of the oven; on the other half a cut through the stove,

3 shows a section through the roasting drum just behind its front end wall,

4 shows a top view of the roasting drum together with a horizontal section through the furnace,

5 shows a top view of the cast iron frame forming the furnace base, together with it sliding fire box.

The two end walls, S ₁ and S _{2 of} the roasting drum are attached to an axis A provided with a crank offset, which, resting in the bearings L ₁ and L ₂ , is set in rotation by means of the crank K.

The end wall S ₁ has the shape of a circular disc, the end wall S ₂ that of a low, truncated, six-sided pyramid, on the circumference of which a circular edge adjoins.

Starting from the smaller end wall S ₁ , the jacket of the drum has the shape of a truncated cone which gradually merges into that of a truncated six-sided pyramid, the edge of which is attached to that of the end wall S ₂ .

Inside the drum there are three obliquely to the drum axis asked, incidentally, radially inwardly projecting walls W _1, W _2, W _3, which, starting at the end wall S ₂ / rich ₃ of the drum length greater than about ^2, and are close all along the drum shell connect.

In the construction shown, the drum shell is made of sheet iron and the walls W ₁ , W ₂ , W _{3 are} cast onto the end wall S _2. In the case of large apparatuses, the drum shell will be made of cast iron and then the walls W ₁ , W ₂ , W ₃ and the end wall S _{1 will be} cast in one piece with the same, while the end wall S _{2 is} to be attached to the edge of the shell.

In the end wall S ₂ there are three trapezoidal openings which can be closed by the little doors t _t , t ₂ , t ₃ provided with turning bolts.

Finally, the end wall S _{2 contains} the holes /, / through which the steam that forms when the coffee is roasted escapes.

When the crank is turned clockwise (Fig. 4), with the doors t ₁ , t ₂ , t ₃ closed, the coffee beans filled into the drum are not only overturned in the opposite direction to the direction of rotation of the drum circumference, but also through the walls W ₁ , W ₂ , W ₃ forced to move from the wider to the narrower part of the drum, i.e. from the end wall S ₂ to S ₁ , while the beans in the narrower part of the drum on the inclined inner surface of the shell after the other Parts slide down; the beans in the drum are thus continuously mixed and very intimately mixed.

The left-hand rotation of the drum (Fig. 4) is used after opening the door ij, t ₂ , t ₅ for rapid emptying of the drum after roasting of the coffee, the same through the conical or. pyramidal shape of the drum shell in connection with the inclined walls W ₁ , W ₂ , W _{3 of} the openings U ₁ , t ₂ , i ₃ is fed very quickly. The coffee then falls over the pouring chute G attached to the furnace jacket into the vessel intended for it.

The lower part O ₁ of the furnace built around the roasting drum is fastened to a cast-iron frame R on which the grate-fitted fire box F is mounted in such a way that it can be brought into position ^{F 1} (Fig. 2) as required. with it pushed completely out of the oven. The latter happens as soon as it appears necessary to interrupt the heat supply to the drum jacket or to fill the fire box F with fresh fuel, charcoal or Coke (in the case of large apparatus).

The upper part O _{2 of} the furnace can be lifted from the lower one and has the smoke exhaust pipe r on the ceiling.

The end walls of the furnace surround the end walls S ₁ and S _{2 of} the drum in such a way that the fire gases only wash around the outer surface of the drum shell, but cannot touch that of the two end walls.

It may also be remarked that the narrower part of the roasting drum, which it is true is expediently conical in shape for more convenient, tight fitting into the furnace, does not necessarily need to be conical, but can also be designed in the shape of a pyramid, so that the drum then becomes its own runs pyramidal along its entire length. As can be seen from FIG. 5, the grate is correspondingly the shape of the drum is narrowing backwards, so - this is up to now Little emphasis has been placed on those parts of the drum with a larger roast content receive a greater amount of warmth than the narrower, less roasted foods Parts.

Claims (2)

Patent Claims: 1. In apparatus for roasting coffee with overheating of the roasting room, in which sliding surfaces (W ₁ , W ₂ , WJ) are arranged in the roasting drum at an angle, otherwise radially to the drum axis, and in which the drum end walls (S ₁ , S ₂ ) are not touched by the fire gases, the use of a drum tapering in the direction of its longitudinal axis, the widest part of which is pyramid-shaped and which is equipped with another pyramid-shaped end wall (S ₂ ) corresponding to this pyramid-shaped, outwardly protruding In its flat surfaces it contains doors (t ₁ , t ₂ , t _z ) which are smoothly and tightly fitted to allow the roasted coffee beans to fall out, so that when the drum is turned to the right, the main mass of the fuel remains in the further part of the drum, but even when it is turned slowly partly to the narrower part and from there back again, when turned to the left, on the other hand, to the opening the doors (T ₁ , t ₂ , t ₃ ) a complete and as fast as possible falling out of the roasted material is made possible. 2. In roasters with in claim 1 characterized Roasting drum and a fire box that can be pushed out of the roasting furnace, the arrangement of a corresponding to the shape of the drum narrowing grate. For this purpose ι sheet of drawings.