Year: 1886

page_text: Date of Application, 27th July, 1886.
Complete Left, 31st Mar., 1887.
Complete Accepted, 3rd May, 1887.
I, ADOLF SPINNER, of Offenburg in the German Empire, Merchant, do hereby
declare the nature of this invention to be as follows:-
The improved apparatus is based upon the fact that materials such as coffee, cocoa
and the like loose part of their weight during the roasting process corresponding to
the progress of the latter, so that it is possible to determine the proper degree of
roasting by the loss of weight.
The object of this invention is an apparatus in which the loss of weight can be
observed, and the amount of roasting thereby estimated.
In this improved roasting apparatus the trunions of the roasting cylinder may be
laid upon or suspended from a forked arm of a balance lever arranged in the stove or
furnace. This balance lever indicates by lifting the drum, the moment at which the
roasting process should be stopped. The roasting cylinder may also be arranged so
that it is automatically removed by the counterpoise lever from the furnace at the
moment when the roasting process should be stopped.
The method of arranging the apparatus is preferably as follows;-
The roasting drum may be cylindrical or preferably spherical, and is supported on
a hollow shaft which is perforated and open at one end for the admission of the
coffee etc. into the drum and the exit of vapours etc. One end of this shaft is
supported by one arm of the balance lever, while to the other arm of the lever is
fixed a displaceable counterpoise. The other extremity of the shaft projects for some
distance from the stove and is securely lodged in a journal which is pivoted below to
the frame so that the journal may be turned and the shaft swung outward in a hori-
zontal plane. The journal also allows the shaft to move vertically. The shaft can be
rotated by suitable power gear and hand crank. While the roasting is taking place
the drum is rotated. Owing to the weight of the material introduced into the drum
the arm of the balance lever is pressed down by the extremity of the drum shaft, so
that the latter is securely lodged between the extremity of the balance lever and the
front end of an inclined rail, on which the extremity of the shaft will run when the
drum is swung out of the stove.

page_text: When the contents of the drum become lighter with roasting, and the loss of weight
has reached that point at which it is found that the roasting process should be dis-
continued, the counterpoise on the balance lever (previously adjusted for this weight)
raises the drum so that the shaft of the latter arrives at the level of the end of the
inclined rail. When this movement is perceived by the operator turning the crank,
the latter reverses the movement of the drum when the furnace door is opened as
hereinafter described and the outer free end of the drum shaft rolls upon the inclined
rail so that the drum leaves the stove.
The lifting of the furnace door is arranged as follows;-The door opens upwards it
being fixed to a lever pivoted to the upper part of the stove and swinging in a vertical
plane, the other arm of this lever carries a counterpoise so arranged that when the
door is closed, the moment of the counterpoise is in-sufficient to open it. The
rotating shaft carries a ratchet wheel into which gears a catch attached to the said
lever. When the rotation of the drum is reversed, the ratchet wheel engages this
catch and draws down the outer arm of the lever, this action gives a larger moment
to the counterpoise which swings the door upward, at the same time releasing the
catch from the ratchet wheel and leaving the latter free.

page_text: COMPLETE SPECIFICATION.
A New or Improved Roasting Apparatus for Coffee and the like.
I, ADOLF SPINNER, of Offenburg, in the German Empire, Merchant, do hereby
declare the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :-
The improved apparatus is based upon the fact that materials, such as coffee, cocoa
and the like, lose part of their weight during the roasting process corresponding to
'the progress of the latter, so that it is possible to determine the proper degree of
roasting by the loss of weight.
The object of this invention is an apparatus, in which the loss of weight during 'the
roasting process can be observed and the amount of roasting thereby estimated.
In this improved roasting apparatus the trunnions of the roasting cylinder may be
laid upon or suspended from a forked arm of a balance lever arranged in the stove or
furnace. This balance lever indicates by lifting the drum, the moment at which the
roasting process should be stopped. The roasting cylinder may also be arranged so
that it is automatically removed by the counterpoise lever from 'the 'furnace at 'the
moment when the roasting process should be stopped.
In the apparatus shown by 'the accompanying drawing, the roasting drum b may be
cylindrical or preferably spherical and is supported on a 'hollow shaft a which is
perforated and open at one end for the admission of the coffee etc., and exit of
vapours. One end of this shaft is supported by one arm c of the balance lever, while
to the other arm c¹ of the lever is fixed a displaceable counterpoise d.
The other extremity of the shaft a projects for some distance from the stove and is
securely lodged in a bearing e which is pivoted below to the frame so that the journal
may be turned and the shaft swung outward in a horizontal plane as shown in dotted
lines in Fig. 3. The shaft and drum can be rotated by suitable power gear as for.
instance tooth-wheels f and g and hand crank h Figs. 1, 2 and 3.
While the roasting is taking place the drum is rotated in the direction of the arrows,
shown by Figs. 4 and 5.
Owing to the weight of the material introduced into the drum the arm c of the
balance lever is pressed down by the extremity of the drum shaft so that the latter is
securely lodged between the extremity of the balance lever and the front end of an
inclined rail i on which the extremity of the shaft will run when the drum is swung
of out of the stove.
When this contents of the drum become lighter with roasting and the loss of weight
has reached that point at which it is found that the roasting process should be dis-
continued, the counterpoise d on the balance lever (previously adjusted for this
weight) raises the drum, so that the shaft of the latter arrives at the level of the end
of the inclined rail i.
When this movement is perceived by the operator turning the crank h, the latter
reverses the movement of the drum, when the furnace door is opened as hereinafter
described and the outer free end of the drum shaft rolls upon the inclined rail i so

page_text: that the drum b leaves the stove and arrives at the outer end of the rail i as shown in
dotted lines in Fig. 3. The horizontal swinging of the shaft a required for this
movement of the drum is rendered possible since the bearing e can be turned round
its pivot on the frame u Figs. 1 and 3.
The roasting drum is emptied, filled with fresh material for the next roasting and
returned to the furnace, and the door of the latter is again closed.
If the hand crank h in the arrangement shown by Figs. 1 and 3 should be handled
unskillfully, it might happen, that when turning the drum, its shaft might be lifted
off the balance lever. This disturbing action of the mechanical device at the crank is
avoided by the special construction of bearing shown by Figs 6. and 7. The crank
shaft sleeve is rigidly connected with the vertical pivot r and a fork w is hinged to the
latter at k, said fork bearing the shaft a.
By the swinging of the drum shaft up and down about the hinge k, the teeth of the
pinions and are slightly displaced towards each other but no swinging of the
hinge k can be produced by the crank h.
The lifting of the furnace door t is arranged as follows: The door opens upwards,
it being fixed to a lever S pivoted at o to the upper part of the stove and swinging in
a vertical plane. The other arm of this lever carries a counterpoise P so arranged
that when the door is closed, the moment of the counterpoise is insufficient to open it.
The rotating shaft carries a ratchet wheel into which gears a pawl m attached to the
said lever S. When the rotation of the drum is reversed, the ratchet wheel engages
this pawl m and draws down the outer arm of the lover S, this action gives a larger
moment to the counterpoise P which swings the door t upward, at the same time
releasing the catch from the ratchet-wheel and leaving the latter free.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I declare that what I claim is:
1. The apparatus for ascertaining the completion of the roasting of coffee and other
matorials consisting of a suitably counterpoised balance lever which supports the
roasting drum during the process of roasting.
2. The apparatus consisting of the drum band shaft a journalled at one end in a
swivel bearing e and at the other end supported by a balance lever c c¹ in combination
with an inclined rail i substantially as and for the purpose set forth.
3: The combination with the drum of a stove with door t, balance arm S and
pawl m adapted to gear into a ratchet wheel on the shaft of said drum substantially as
and for the purpose set forth.
Dalhin 916 love of 11007