Improvements in Screw and Nut Mechanism.
Year: 1898

page_text: Date of Application, 16th Aug.,
1898
Comutata Crncification Loft 10th May 1900 Accented
10th Ava 1000
PROVISIONAL SPECIFICATION.
Improvements in Screw and Nut Mechanism.
We, GEORGE CLARKE, Meclianic, of 152, Wyndford Street, Maryhill, in the
County of the City of Glasgow, and ALEXANDER MACKENZIE, Cycle Mechanic, of
180, High Street, in the Town and County of Linlithgow, do hereby declare the
nature of our invention to be as follows:-
This invention has reference to improvements in and relating to feeding devices
where an internal screw threaded nut works on a screw threaded spindle, such as
in portable tobacco cutting machines, miners' boring tools, and the like.
The improvements consist in forming the nut with the internal screw thread
on only one half or a segmental part of the surface, the other semicircular or
segmental facing part of nut being cut away, and in forming said nut with a
corresponding longitudinal extended semicircular or segmental part with the
screw thread facing the screw thread of that of the other part of nut, but at a
distance from it, the thread of the one part commencing nearly at the point where
the thread of the other terminates, but leaving a plain surface clear of thread
at the junction. The usual feeding gripper would be formed on or attached to
outer surface of nut.
By this improved construction the nut can be shifted by hand along the screw
spindle to any position so that the motion of the latter does not require to be
reversed at the end of the feed, to return the nut back to the starting position.
T
1
11
1000
improvements in screw and Nut mechanism;
WC, GEORGE CLARKE, Mechanic, of 152, Wyndford Street, Maryhill, in the
County of the City of Glasgow, and ALEXANDER MACKENZIE, Cycle Mechanic, of
180, High Street, in the Town and County of Linlithgow, do hereby declare the
nature of our invention and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement in writing
reference being made to the accompanying sheet of drawings:
:-
This invention has reference to improvements in and relating to feeding devices
where an internal screw threaded feed nut works on a screw threaded spindle,
and is used in such appliances as portable tobacco cutting machines, miners boring

page_text: tools, and the like, and comprises a nut which is screw threaded, having the
segments cut away on opposite semicircular surfaces.
And in order that our said invention and the manner of carrying same into
practice may be properly understood, we have hereunto appended an explanatory
sheet of drawings in which Figure 1, represents a horizontal section, Figure 2
an outside elevation and Figure 3 a vertical section of a screw nut formed accord-
ing to our improvements.
Referring to these drawings:-
-
The improvements consist in forming the nut a with the internal screw
thread a on only one half or a segmental part of the surface, the other semi-
circular or segmental facing part of nut being cut away, and in forming said nut
with a corresponding longitudinal extended semicircular or segmental part 6 with
the screw thread facing the screw thread a¹ of that of the other part a of
nut, but at a distance from it, the thread of the one part commencing nearly at
the point where the thread of the other terminates, but leaving a plain surface
clear of thread at the junction. The usual feeding gripper a² would be formed
on or attached to outer surface of nut.
The threaded spindle c of the boring or like machine is displaced longitudinally
by rotation, when the feed nut is in gear, but the nut can be tilted on the spindle
as indicated by dotted lines in Figure 1, and while so tilted can be shifted by
hand along the screw spindle c to any position so that the motion of the latter
does not require to be reversed at the end of the feed, to return the nut back to
the starting position.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:-
1
In combination with the threaded spindle of a boring or like machine, a
threaded feed nut having the semicircular parts cut away on the opposite segments
facing the screw threads, the nut being adapted to be tilted on the spindle to
be shifted longitudinally on the spindle, substantially as described.
Dated the 0th Nov 1900
Dated tho. 0th Mov 1900
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.