Improvements in Conical Collars for Lathes and other Tools.
Year: 1899

page_text: Date of Application, 12th Sept., 1899
Complete Specification Left, 18th May, 1900-Accepted, 21st July, 1900
PROVISIONAL SPECIFICATION.
Improvements in Conical Collars for Lathes and other Tools.
I, CHRISTIAN NICKEL, Workmaster, Aachen, Province of Rhineland, Yunker-
strasse No. 58, do hereby declare the nature of this invention to be as follows:-
The present invention regards improvements in conical collars for lathes and
other tools. Its main feature is, that the conical collar a is movable in longitudinal
direction whereby it can give way to the pressure of the work-piece towards the
interior of the mandril-stock without causing a squeezing of the conical part
of the mandril S. Moreover the nut a is rendered adjustable when the collar a
is worn out this nut is fastened and effects that the cone of the collar a does
not fit loose. In the annexed rough sketch in which Fig. 1 is a longitudinal
section, Fig. 2 a cross-section through the conical collar, the main letters mark
the following parts: A is the front part of the mandril-stock, B is the back part
of the mandril-stock; C is the cone, D the head-stock, K is the mandril-head and
S is the mandril.
a represents the movable collar with the wedge f, a 1 is the back cone-socket,
c the adjustable screw, d the adjustable front-nut and e the pivot.
I, CHRISTIAN NICKEL, Workmaster, Aachen, Province of Rhineland, Yunker-
strasse No. 58, 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 collars of lathes and other tools, known till now, mostly consisted in upper
and lower cylindric or conical bushes; this construction has however the draw-
back that the bushes wore out rapidly. They became quickly out of center
whereby the mandril fits loose in the collar moreover by the pressure of the
sliding-puppet, the center-head K, braked against the front part of the bush, will
squeeze itself. So the collar grows unserviceable and the bushes must be oftenly
replaced.
All these drawbacks are done away by my invention represented in the annexed
drawing.
Fig. 1 shows a new conical collar with the mandril S and the mandril-stock D
in view and partly in section; Fig. 2 represents a cross-section of the front
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page_text: conical collar a; this collar is of cylindric shape and surrounds the conical part C
of the mandril S. Close behind the. conical end C, the mandril S is provided
with thread, on which a nut d is screwed. By fastening the nut d the cone, when
loosened by wearing, can be tightened again in its collar, without exercising an
influence on the back conical collar a 1 or depending on it.
The work-piece fixed between the centers of the mandril and of the sliding-
puppet, when heated by the friction of the turning-tool, dilates and trys to force
the front center-head K against the front-wall A. In order to prevent the front
part of the mandril from squeezing in the conical bush-socket, the latter is auto-
matically adjustable in longitudinal way. As the front conical collar a possesses
a cylindric guide, the collar a must be prevented from revolving by a spring-
wedge F. As the conical collar is adjustable in longitudinal way and retains its
position invariably on the conical part of the mandril by means of the adjustable
nut d and the center-head K, the total pressure of the mandril is transferred on
the back regulating screw c. As the arched surfaces of the regulating screw and
of the pivot are adjoining the friction takes place in one point only viz.. in the
centre. The mandril S and the conical collar al of the back wall B are kept tight
by an adjustable nut e.
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:-
Improvements in conical collars for lathes and other tools, distinguished by a
conical collar, automatically adjustable in longitudinal way, cylindrically
guided and guarded against revolving by a spring wedge F, susceptible of dis-
lodging itself with the mandril S in the direction of the axle, by the horizontal
counter-pressure of the work-piece, without causing any squeezing, moreover
by the nut d, by the fastening of which a wearing out of the front conical collar
is balanced.
Wiesbaden, this 16th day of May 1900.
For CHRISTIAN NICKEL,
Consul Em° Franz Grein.