A Machine for Furrowing Millstone Facing-hammers.
Year: 1899

page_text: Date of Application, 22nd Apr., 1899-Accepted, 22nd July, 1899
A Machine for Furrowing Millstone Facing-hammers.
I, FRIEDRICH MÜLLER-HAUERT, Mechanical Engineer, of Kandern, Grand Dukedom
of Baden, Germany, 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 present invention relates to an improved machine for furrowing or sharpening
millstone facing-hammers.
In the accompanying drawings
Fig. 1 shows a front elevation of the machine,
Fig. 2 is a side elevation, partly in section of Fig. 1, and
Fig. 3 illustrates the clamping device for the head of the millstone facing-hammer
with the latter secured therein.
The machine consists essentially of the following parts: The standards A, support-
ing in suitable bearings the shaft B. On this shaft are interchangeably mounted
any desired or required number of rotary cutters C. Beneath these cutters a
horizontally movable block D is arranged and fitted so as to clamp between its two
cheeks the millstone facing-hammer H in such a manner that the head of the hammer
which has to be furrowed or sharpened projects above the block. The block D is
movable in such a way that the rotary cutters C are enabled to furrow or sharpen the
head of the inillstone facing-hammer H. After furrowing the head of the millstone
facing-hammer by means of the rotary cutters in one direction, the hammer may be
released from the clamping device of the block D and fitted in again at an angle of
90° to its former position, so that on now again moving the block underneath the
rotary cutters furrows rectangular to those previously produced will be provided in
the head of the hammer, the whole surface of the millstone facing-hammer then
being serrated as indicated in the plan of the clamping device with the hammer head
secured therein of Fig. 3. The shaft B with the rotary cutters mounted thereon
may be driven in any suitable manner; the drawings, as an example, showing a
second shaft E provided with a fly wheel S and a crank and transmitting its motion
by means of a toothed wheel gearing to the first shaft B. The rotation of the
shaft B thus produced will be very slow as required.
The shaft E may simultaneously serve for causing the automatic advance of the
block D beneath the rotary cutters C. This advance of the block D is directly
effected by means of a screw spindle F, supported in suitable bearings in the base
plate G of the machine. The block D is internally screw-threaded according to the
screw spindle so that on rotating the spindle in its bearing the block D will be
caused to advance. The base plate G may in addition be provided with suitable
guide grooves or rails for the block D. One end of the screw spindle F is provided
with a hand wheel J, fitted with a handle h, for rotating it either forwards or back-
wards as desired. The circumference of the hand wheel J is serrated, for the purpose
of causing the automatic advance of the block D, which is effected by mounting on
the shaft E an eccentric disc a. Around this eccentric disc a sleeve in connection
with a rod is fitted, so that the rotation of the disc a will cause the rod z to rise
[Price 8d1

page_text: and descend alternately. The lower extremity of the rod z fits with an eye over a
lever arm d, the latter being secured to a rod e, which in movably mounted parallel
to the screw spindle F. On the rod e is further mounted at an angle of 90° to the
lever arm da second lever arm f which is provided with a vertical slot, in which a
pin carrying a movable pawl k, can be adjustably fixed by means of a screw g. This
pawl engages with the serrations on the circumference of the hand wheel J. The
ascending and descending motion of the rod z, moving the two lever arms d and f
around their pivot e, will through the intermediary of the pawl k cause the revolution
of the hand wheel J and consequently the advance of the block D. The vertical slot
in the lever arm f serves for adjusting the pivot of the pawl in such a manner as to
cause the latter to advance the hand wheel J one or more of the serrations simul-
taneously so that in this way the advance of the block or the hammer head
respectively may be regulated.
To prevent accidental and unintended movement of the millstone facing-hammer
in the block D a clamping device is provided which will rigidly secure the hammer
in its respective position. This clamping device consists of a ring R secured to the
hammer head, at a suitable distance from the operative face, by means of set screws p.
The ring R is then placed on the top end of the two jaws comprising the block D,
the millstone facing-hammer is secured between these two jaws, one of which is
movable in respect to the other with a spring interposed between, by any suitable
means such as the bolts connecting the two jaws and provided with the screw nuts r.
The hammer head will in this way be fixed reliably and straight and will constantly
be held at the same elevation above the block D when changing its position to provide.
the cross furrows in its surface.
To facilitate the interchange and mounting of the rotary cutters C on the shaft B,
the latter consists of two parts connected together by means of a sleeve or screw
nuts at the left hand side of Fig. 1. After unscrewing this sleeve or nut 8 from
the part of the shaft B carrying rotary cutters C, this part of the shaft may be
withdrawn thus permitting the removal or mounting respectively of the rotary
cutters.
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) A machine or device for furrowing or sharpening millstone facing-hammers
having a suitable number of interchangeable rotary cutters mounted on a rotary
shaft, the millstone facing-hammer supporting block being movable in suitable
guides beneath said cutters in a direction rectangular to the axis of the shaft,
substantially as and for the purpose described.
2) A machine or device for furrowing or sharpening millstone facing-hammers
the whole constructed arranged and adapted to operate as described with reference
to the accompanying drawings.
Dated this 22nd day of April 1899.