Improvements in Nut and Set Screw Turning Lathes.
Year: 1891

page_text: Date of Application, 14th Apr., 1891
Complete Specification Left, 14th Dec., 1811-Accepted, 23rd Jan., 1992
PROVISIONAL SPECIFICATION.
Improvements in Nut and Set Screw Turning Lathes.
I JAMES EDWARD CARTER of Craven Edge Halifax in the County of York,
Engineer and Machinery Inspector, do hereby declare the nature of this invention
to be as follows:-
I employ an ordinary single geared fast headstock with a hollow spindle which
for distinction will call the live spindle. The front or nose is screwed to receive a
hardened steel bush with a hole same size as top of thread of set screw or nut to be
turned, the back of live spindle is also hardened.
Within the hollow spindle is a dead spindle bored up at one or both ends to
receive a screwed mandrel which is secured to the dead spindle by taper pin or
cotter, for turning nuts the screwed portion of the mandrel projects through the
bush in the live spindle nose, nearly the depth of nut, on the dead spindle at the back
end of live spindle is a boss or clutch held in position by a set screw entering a key
groove in the dead spindle. This boss or clutch is operated by a _ lever having
its fulcrum at the back end of fast headstock the short arm of L lever
forms a clip or fork with two prongs which project into a groove on the boss or
clutch, the longer arm projects towards the front of headstock and forms a handle
so that in pressing the handle down the clutch or boss is brought against the end
of live spindle causing the dead spindle to rotate, when the handle is raised the
clutch or boss is clear of the spindle end and by a projection on the clutch or boss
coming in contact with a projection on the fork or short arm of
lever stops
the rotation of the dead spindle, the latter is supported at the back end in a suitable
bearing. The operation for turning nuts is as follows, the nut in fingers of operator
is held against the screwed mandrel which rotates and screws on the nut with its
face against nose of spindle bush and by the tool coming against nut draws the
back or clutch boss against spindle end sufficient to allow the nut to be turned.
The nut is released by raising the lever handle which stops rotation of dead spindle,
whilst the live spindle rotates, releasing the nut without stopping the live spindle,
same operation for set screws, except that the mandrel is bored out to receive the
screw, and is within the spindle nose the distance according to length of set
screw.
The fast headstock is mounted on ordinary lathe bed having a compound slide
rest for tools.
Dated this 10th day of April 1801
JAMES EDWARD CARTER,
Craven Edge, Halifax.
COMPLETE SPECIFICATION.
Improvements in Nut and Set Screw Turning Lathes.
I, JAMES EDWARD CARTER of Craven Edge Halifax in the County of York,
Engineer and Machinery Inspector 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 :-
In order that my invention may be fully understood I have hereunto annexed
one sheet of drawings, in which
Fig. 1 is front elevation of headstock with hollow spindle and mandrel for nut
turning.
Fig. 2 is detail partly in section of mandrel for set screws.

page_text: Figs. 3 and 4 are side and end elevation of bush with cutter for facing underside
set screw heads, about half full size.
Fig. 5 is plan of Fig. 1.
Figs. 1. 2 and 5 are drawn about 4th full size.
At 1. is the headstock with hollow spindle 2 the front 3 is screwed to receive
hardened steel bush 4 serrated on its face 5, the bush 4 is bored out to receive the
end of mandrel 6 according to the size of nut or set screw to be turned, on the
other end of mandrel 6. is a clutch boss 7 secured to the mandrel 6 by set screw 8.
the clutch boss 7 is bored out slightly conical to fit on the back end 9 of hollow
spindle 2.
10 is a lever the shorter arm 11. projecting into the groove formed in
the clutch boss 7. The longer arm 12 of the lever 10 projects along the side of
headstock, so that the operator by slightly depressing the arm 12. causes the
mandrel 6 to rotate with the spindle 2 a nut is held in the fingers of the operator
to be screwed on the end 13 of mandrel, against the face 5 of the bush 4 the
3 tools 14. 15. 16 Fig. 5. are then brought into contact with the nut, the 14 tool
roughs the 15 tool finishes and the 16 tool chamfers the nut, the operator then
raises the arm 12 of lever 10 and the projection 17. of the arm 11 comes in contact
with the projection 18 on the clutch boss 7. stopping the rotation of the mandrel 6.
whilst the spindle 2 continues to rotate the serrated face 5 of bush 4 forces the mut
off the mandrel without having to stop or reverse the lathe.
For set screws the mandrel 6 is bored up and screwed to size of set screw to be
turned as shewn in Fig. 2.
For turning underside of set screw heads the set screws are held by the head in
a pair of jaws on the front of rest, and in lien of the bush 4 a bush 19. with
cutter 20. is screwed into the spindle nose 2, and the set screw is forced against the
cutter by the slide rest.
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.
1st. A nut and set screw turning lathe such as herein substantially described and
illustrated.
2nd. The lever 10. clutch boss 7. serrated bush 4 as and for the purpose herein
set forth.
سمان,191 Dated in
J. E. CARTER.