Improvements in Capstan Rests for Lathes and similar Machine Tools,
Year: 1899

page_text: Date of Application, 6th Apr., 1899-Accepted, 1st July, 1899
COMPLETE SPECIFICATION.
Improvements in Capstan Rests for Lathes and similar Machine
Tools,
We, JULIUS WILHELM VON PITTLER, Mechanical Engineer, and THE LEIP-
ZIGER WERKZEUG-MASCHINEN-FABRIK Vorm. W. v. PITTLER A. G., Manufacturers,
both of Gohlis, near Leipzig, in the Kingdom of Saxony, do hereby declare the
nature of this invention to be as follows:-
The present invention relates to the toolholder described in the Specification
of Patent No. 8158 dated 17th April 1896. The subject of the invention is an
annular toolholder or capstan rest for lathes and similar machine tools, which
toolholder can be turned on its axis in an annular guide, and shifted both longi-
tudinally and transversely, in order that it may be used at will either for
longitudinal turning or for facing. Like the toolholder described by Specification
No. 8158, the present tool-holder facilitates the consecutive use of different
tools and the rapid change from facing to longitudinal turning and vice-versa.
In the accompanying drawings:
Fig. 1 is a side elevation of the toolholder or capstan rest of a repetition lathe
embodying this invention, along line Z-Z of Fig. 2; Fig. 2 is a transverse
section of the same along line Y-Y of Fig. 3; Fig. 3 is a horizontal section
along line X-X of Fig. 2.
Fig. 4 is a side elevation of a lathe provided with a capstan rest and arranged
for longitudinal turning.
The capstan rest C is held in the guide ring K of the slide and carries a
toothed ring C into which gears a toothwheel E adapted to be turned by means
of a handwheel F. The capstan rest C is provided with a locking device like
the toolholder ring described by Specification No. 8158 of 1896, which device
chiefly consists of a bolt G held in the guide ring K and adapted to enter with its
extremity one of the radial sockets or holes C formed in the circumference of
the capstan rest C. This bolt can be lifted out of its socket by turning a lever G¹
adapted to act on the bolt by means of a cam or other suitable device.
The capstan rest C has also holes C2 placed parallel to the axis of the holder
and adapted to receive the tools R, the number of parallel holes (2 being equal
to the number of radial holes C.
screw,
As indicated by Fig. 3, each tool R is secured in its socket C2 by means of a set
and in order that they may be easily tightened or released, suitable open-
ings g and glare formed in the annular guide K, through which the keys h and h¹
are introduced for the purpose of turning the set screws. When the set screws
are tightened by means of the keys, the toolholder C can only be turned on its
axis, after the keys h and h¹ have been drawn back, but the said keys always
remain in the guide ring K.
The annular guide K is mounted on the cross-guide K₁ of the longitudinal
main slide or slide rest K2, and can be shifted by means of the transverse screw-
spindle and handwheel, according as it is desired to operate on the piece of
work L with the front tool R or with the rear tool R',

page_text: Screw-threads may be cut with the capstan rest by means of the guide
spindle 63, which is set in motion from the lathe-spindle 67 by means of the change
wheels e, Fig. 4.
As shown by Fig. 1, the annular shape of the toolholder C leaves sufficient
room in the centre for a shaft L or other longitudinal piece of work to pass
through the same. In the drawings A indicates the lathe-bed; and 6 the nut
of the guide spindle.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed we declare that what
we claim is;-
1. A capstan rest C, the axis of which is parallel to that of the lathe and
adjustable relatively to the same and which is open in the centre, substantially
as described and for the purposes specified.
2. A capstan rest and accessories constructed and adapted to operate substan-
tially as described and shown by the drawings.
JAVCL
VILLS
FAIRFAX & WETTER,
Agents,
37 and 39, Essex Street, Strand, London, W.C.