Improvements in Machines for Forming Screw-threads in Moulds for Casting Screws, Worms, or the like.
Year: 1892

page_text: Date of Application, 30th June, 1892-Accepted, 30th July, 1892
COMPLETE SPECIFICATION.
[Communicated from abroad by DIE ACTIEN GESELLSCHAFT GRUSONWERK, of
Madgeburg-Buckau, in the Empire of Germany.]
Improvements in Machines for Forming Screw-threads in Moulds for
Casting Screws, Worms, or the like.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex, 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 invention herein described relates to a moulding machine by means of which
moulds to be used for casting screws, worms, or the like, having left or right
handed threads of any desired pitch, are made by a templet moving up and down
in spiral lines.
The said invention consists chiefly in the combination with a shaft which carries
a templet, of adjustable inclined guide rods, and a sliding support which is moved
laterally through the medium of suitable gearing by the templet shaft, and which,
during this lateral movement causes the said shaft and templet to move up and
down and thereby forms the screw-threads in the mould.
In order that our invention may be clearly understood we will now proceed to
describe the same with reference to the accompanying drawings in which :-
Figure 1 is an elevation of a machine constructed according to our invention.
Figure 2 is a sectional plan on the line of Figure 1.
Figure 3 is a vertical central section of Figure 1.
Figure 4 is a sectional plan, and Figures 5 and 6 are elevations, of parts of the
apparatus which are hereinafter more particularly explained.
Like letters indicate corresponding parts throughout the drawings.
A is the mould of sand, loam, or other suitable material, in which the screw or
worm thread is to be made. a is a templet by the turning of which in spiral lines
the screw-thread is produced in the mould. This templet is fixed to a vertical
shaft B which is turned by hand with the aid of the crank b, or is otherwiso
operated.
In order to form screw threads the templet must, during the turning movement,
also be moved up and down. This vertical movement is effected by inclined rods c,
which, during the rotation of the templet shaft are displaced horizontally while
kept parallel to their initial position, and slide in guides d' provided on a sleeve d
embracing the shaft B. For this purpose the rods care held by means of clamping
screws to the two arms C¹ and C" of a support C which can be moved to and fro
in a horizontal guide D₁ of the frame D. The horizontal motion of the support
effected by a toothed pinion which is held in a bearing D' and connected to the
shaft B by means of a groove and key so that the shaft can slide in the pinion
which gears with a rack fon the said support.
is
When the crank 6 is turned, the toothed pinion e forces the support C with the
rods 09 either to the right or to the left hand side of the machine, and, during this
movement, in consequence of the inclination of the rods c, the shaft B is raised or
lowered, and the circular movement of the templet a is thus converted into a helical
movement.
For enabling the pitch of the screw to be altered the rods c are made adjustable,
in suitable slots of the arms C¹ and C" and the guides d' are arranged to turn on
the sleeve d, Figure 4, so that they permit this adjustment.
It will be obvious that in this manner any desired pitch may be given to the

page_text: screw, moreover right and left handed threads can be produced, according as the
rods c are more or less inclined towards one side or the other.
The arrangement of the sliding support and its guide may be modified; for
instance the said support, instead of being arranged as shewn, may be placed below
the rods c. Moreover the guides d' for the rods, the manner of holding the said
rods to the arms C and C, and the means for permitting the adjustability of their
inclination, may be varied.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents, I declare that what I claim is :-
1st. In a machine for forming screw threads in moulds such as are herein specified,
a shaft carrying a templet and arranged in combination with a sliding support and
with one or more guide rods, in such a manner that by its rotation the said shaft
imparts lateral movement to the said support, which, by means of the said inclined
guide rods, moves the templet shaft up and down through a distance corresponding
with the pitch of the screw.
2nd. Providing for the adjustability of the inclined guide rods substantially as
and for the purpose specified.
3rd. A machine for forming screw threads in moulds constructed substantially
as described with reference to the accompanying drawings and operating as set
forth.
Dated this 30th day of June 1892
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.