Improvements in Stone-planing Machines.
Year: 1897

page_text: Date of Application, 21st Dec., 1897-Accepted, 19th Feb., 1898
COMPLETE SPECIFICATION.
Improvements in Stone-planing Machines.
I, JAMES MANN, of 30th and Locust Streets, City and County of Philadelphia, State
of Pennsylvania, one of the United States of America, Stone-cutter, 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:-
My invection relates to improvements in planing-machines and more particularly
to improvements in machines for planing or forming segmental blocks of stone, the
object of my invention being to furnish a machine which with slight and easily made
changes will cut a block of stone into a circular segmental form of any radius
commonly used in arches of buildings etc., that is to say, a radius of from three feet
or less to one of twenty feet or more.
In the accompanying drawings forming part of this specification and in which
similar letters of reference indicate similar parts throughout the several views:
Fig. 1, is a plan of a stone planing machine embodying my improvements:
Fig. 2, a section of Fig. 1 on line 1-2;
Fig. 3, a side elevation of Fig. 1 ;
Fig. 4, a view similar to that shown in Fig. 1 showing the machine fitted with a
bed plate adapted to cut segments of a larger radius, and
Fig. 5, a plan of a modified form of machine adapted to cut either straight lines
or arcs of circles.
A, Figs. 1, 2 and 3, is a bed plate adapted to carry the stone to be cut and
furnished on its under side with guides B adapted to run in or on tracks or
D is a segmental rack,
guides C, C which have the form of concentric arcs.
concentric with tracks C, C¹, which is cast with or bolted to the under side of plate A.
E a shaft carrying a screw F tangent to and gearing with rack D and by means of
which this rack and the bed plate are driven. G, Figs. 1 and 2, is a gear wheel fast
on shaft E which neshes with and is driven by a gear wheel H which is fast on a
shaft I carrying two fast pulleys J, K and a loose pulley L. The fast pulleys are
driven, one by a straight belt and the other by a crossed belt, not shown, which belts
are, by means of a belt shifter M, adapted to be simultaneously moved one from its fast
pulley to the loose pulley, the other from the loose pulley to its fast pulley and vice
versa as is usual in machines of this class where it is necessary to reverse the
driving gear, in order to obtain a reciprocating motion.
is a cross head one end of which is carried by a frame O and the other by a
post P upon which it is capable of a vertical movement as usual. The purpose of
the post P is to interfere as little as possible with the movement of the bed plate A
which turns about this post, although it is in no way connected with it, as shown in
the drawings. R are tool holders carried on cross head N which are capable of a
longitudinal adjustment on said cross head and in addition are in themselves capable
of a vertical and a rotary adjustment as is usual.
The bed plate A is furnished with a number of perforations or holes a into which

page_text: pins b may be driven which together with wedges c hold the block of stone S to be
cut in position on the bed plate.
The bed plate shown in Figs. 1, 2 and 3 is adapted to travel in an arc of small
radius and will cut ares of, say, from three to ten feet depending upon the position of
the stone upon the plate. The bed plate is driven to and fro by means of rack D
and screw F through the mechanism shown or by means of any other suitable
and well known mechanism.
If it is desired to cut an arc of greater radius than is possible on the plate shown
in Figs. 1, 2 and 3 this plate is removed and a plate A', Fig. 4, furnished with guides
corresponding to the guides B, Figs. 1, 2 and 3, but of a radius corresponding to
that of the tracks C, C3 is placed on the machine. The tracks C³, C³ are of
greater radius than that of tracks C, C¹ and are adapted to guide plate A¹ so that
ares of, say, from seven to fourteen feet. radius may be. cut upon a stone suitably
secured to the bed A¹ depending, of course, upon the position of the stone S
upon the bed. The bed A is furnished with a rack D¹ which is concentric with
tracks C2, C3 and is driven by a screw F1, Fig. 1, on shaft E as is the rack D
previously described.
C+, C are a third set of tracks similar to those already described which, are adapted
to carry a bed plate to cut still larger ares than is possible on plate A', the
arrangement of the third bed plate being similar to that of those already described.
The multiplicity of guides shown and described are preferably cast in one piece.or
are formed in several pieces and bolted together.
Fig. 5 a modification of my invention is shown adapted to cut either straight or
curved lines. For cutting curved lines the bed plate A is furnished with guides
corresponding in radius to the radius of tracks C, (; for straight lines with straight
and parallel guides adapted to run in tracks Co, C. The means for driving the bed
plate and for carrying the cutting tools being similar to that described before in all
respects.
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 :-
The combination, in a planing-machine, of a base-casting in which are formed two
or more sets of tracks or guides each pair of which have the form of arcs of concentric
circles and all of which lie substantially in the same horizontal plane, removable bed-
plates furnished with one pair of guides corresponding in curvature with and adapted
to engage one pair of the tracks or guides in the base, a rack concentric with said
guides and secured to said bed-plate, and means, substantially as described, for driving
said rack.
T
1007
JAMES MANN.
D. Young & Co.,
11 and 12, Southampton Buildings, London, W.C., Agents for the Applicant.