Improvements in or relating to Bearings and Brake or Retarding Mechanism for Revolving Shafts.
Year: 1897

page_text: Date of Application, 25th Oct., 1897-Accepted, 18th Dec., 1897
CUMI DNIE
Improvements in or relating to Bearings and Brake or Retarding
Mechanism for Revolving Shafts.
I, ANTON BOLZANI Manufacturer of 118 Invalidenstrasse Berlin, N, in the Empire
of Germany, 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 subject of the present invention is a bearing device for vertical shafts which
serves to oppose a resistance to the rotation of the shaft in the one direction and to
allow it to rotate freely in the other direction.
The invention is illustrated in the accompanying drawing in Fig. 1 in vertical
section through the axis of the shaft and in Fig. 2 in plan. In Fig. 3 a device for
securing the bearing box as shewn in plan.
The shaft a is journalled in a box 6 in which it can turn freely. The step-box is
supported in the machine frame d in such a manner that it can only move in a
vertical direction, that is to say it follows the axial pressure of the shaft. For this
purpose, for example a block or plate e is secured to the machine frame and engages
by means of a projection f with a longitudinal groove g in the journal box b. This
box is provided at its upper end with a flat flange or rim with which it rests upon a
disc or cup which in its turn rests upon the machine-frame d. The disc i is
provided with a cylindrical vertical flange provided with an interior ratchet-wheel or
teeth with which engages a pawl m, carried by a disc on the shaft under the
action of a spring n. The disc is rigidly attached to the shaft a and must thus
partake in its rotative movement. When therefore the shaft rotates in the direction
of the arrow, Fig. 2, it will, by means of the disc and pawl m rotate the cup i with
it, and as the latter is gripped between the flange of the step-box b and the machine
frame d it will impede the movement and thus brake the rotation of the shaft. When
the shaft turns in the opposite direction, the pawl m will pass freely over the teeth k
and the rotation of the shaft will take place freely.
The pressure of the step-bearing upon its support is therefore employed to make
the rotation of the axially loaded shaft difficult in one direction and this resistance is
therefore in a definiate proportion to the pressure exerted by the shaft. On the other
hand during the rotation of the shaft in the opposite direction all the parts of the
pressure-bearing remain at rest and are in consequence not exposed to any wear
whatever and the shaft will rotate freely.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what I
claim is:
1. Shaft bearings to resist axial thrust constructed so that the bearing rests on a
brake disc or cup co-operating with it and having brake-surfaces of any desired form
the brake disc only rotating in one direction with the shaft, by means of a pawl
connected to the shaft and ratchet teeth on the brake disc or equivalent device
substantially as described.

page_text: 2. The combination and arrangement of parts constituting the complete bearing
for shafts substantially as described and illustrated in the accompanying drawings.
Dated this 25th day of Oct: 1897.
BOULT & WADE.
Agents for the Applicant.