Improvements in Driving Mechanisms for Adjustable Shafts.
Year: 1898

page_text: Date of Application, 12th Nov., 1898-Accepted, 7th Jan., 1899
COMPLETE SPECIFICATION.
Improvements in Driving Mechanisms for Adjustable Shafts.
I, PETER JENSEN, of 77, Chancery Lane, London, Chartered Patent Agent, do
hereby declare the nature of this invention, a communication to me from abroad
by Berthold Heymann, of 16, Markt Mogilno, Posen, Prussia, Engineer, and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
-
The present invention has for its object improvements in mechanisms such as
bevel and other toothed or friction wheels, serving for driving shafts which are
adjustable whilst rotating as for instance shafts used in mills.
The use of such wheels for driving mill-stones has hitherto had many dis-
advantages, the principal ones being:
Where bevel wheels are used, the pitch-circles of the two wheels change when
the shaft is shifted, so that their gearing with each other is disturbed, the result
being a not uniform motion and a great wear and tear of the wheels and of the
shaft bearings or brasses. Furthermore, because of the one-sided wear of the lower
brass or step bearing the space between the stones becomes unequal and the result
is a bad and not uniform product. The same one-sided wear and tear of the lower
brass occurs also when pulleys or other driving mechanisms are employed.
The present invention does away with these disadvantages, the vertical shaft
being driven indirectly.
The invention is illustrated by the accompanying drawing.
Fig. 1 being a part sectional front view,
Fig. 2 a plan-view and
Fig. 3 a part sectional side-view of the mechanism.
The bevel wheel 6 on the shaft a works with its nave entirely independent
from the shaft in a gun metal bush d made in parts and adjusted by set screws d'.
On the upper side are arranged on the nave c two or more lugs i which are meshing
with a carrier or driver e keyed on the shaft. The shaft passes through the nave c
and runs by means of its pivot, rotating in the step-box g, upon the lever f,
which may be screwed up or down for adjustment as required.
When the stone is screwed up or down, the driver e slides up and down between
the lugs i whilst the wheel b with its nave c remains in its original position. By
these means it will be seen that the pitch-circles do not change and that the
lateral pressure acts only upon the nave instead of upon the shaft as hitherto, a one-
sided wear of the bearing brasses being thereby entirely avoided. The shaft can be
made thinner as it is no more exposed to lateral pressures. It is obvious that by
these means a quiet uniform motion and a uniform wear of the wheels is obtained.
When the brasses or bush d of the nave c wears off owing to the pressure of
the wheel b, a thin washer is placed underneath it. In order to oil the bush d
and the pivot, the oil-cup of the former is filled with oil in any suitable manner.
To throw the shaft out of gear the wheel b is raised by a suitable device from
off the nave c which has a conical form. If the wheel is in one piece with the nave,
the wheel is raised together with the bush d and step bearing 9 by means of the
lever f

page_text: Having now particularly described and ascertained the nature of the said
invention, as communicated to me by my foreign correspondent, and in what
manner the same is to be performed I declare that what I claim is :-
1. An improved driving device for shafts which are to be adjusted whilst
running, characterized by a driver fitted on the adjustable shaft and meshing with
lugs on the nave of the driving wheel, so that it slides, when the shaft is raised
or lowered, between these lugs, whilst the wheel always remains in its original
position, substantially as set forth.
2. The construction of driving device shewn on the drawing.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.