An Improved Belt-stretching Machine.
Year: 1894

page_text: Date of Application, 4th Dec., 1894-Accepted, 16th Feb., 1895
An Improved Belt-stretching Machine.
We, ANDOR PALENCSAR, Engineer, and THEODOR FISCHER Merchant, both
of 2, Csömörint, Budapest, in the Kingdom of Hungary, 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:-
This invention relates to an apparatus for subjecting driving belts to the same
strain that they are subjected to in working, thereby obviating the necessity of
subsequently tightening the belts after being used for the first time, and also
ensuring that the belt is sufficiently strong to stand the working strain put
upon it.
Our invention is illustrated in the accompanying drawings in which :—
Figure 1 is a view in side elevation of the apparatus.
Figure 2 is a view in front elevation of the power-measuring device.
Figure 3 is a view in side elevation of Figure 1, and
Figure 4 is a view in sectional elevation on the line a, a, of Figure 3.
Throughout the views similar parts are marked with like letters of reference.
The apparatus consists of a frame A preferably made of angle iron and connected
together by suitable stays or struts a and b. The frame A carries bearings c, c, for
a shaft e provided with a cranked handle d. On the frame A are two tightening
or stretching devices B, B. On the stays bare mounted bearings f, f, to carry a
shaft provided with a cranked handle g- This shaft is geared with a shaft i
through spur gearing h, z, 2, and 1, the wheels 2 and 2 being mounted on a lay
axle so that when the cranked handle is turned, the shaft i is also rotated.
The shaft may be driven by means of a belt instead of by the cranked handle
from any convenient source of power. On the shafte is fixed a pulley k upon
which the pulley belt to be tested is coiled.
g
For the purpose of guiding the belt straight, movable stops m are provided on
bars arranged in front of the stretching devices, the said bars each having a
divided scale. The stops m are fixed in position to suit the width of the belt to
be tested by means of set screws n. A similar device is provided on the shaft i,
except that in this case, movable collars o are employed in place of the stops m
and the divided scale is on the shaft. The shaft has a slot in which one end of
the belt is held by means of a wedge q.
P
The straining device B consists of a frame carrying a screw spindle t provided
with a hand-wheel s. The spindle t acts on a strong spring u the free ends of
which bear upon the bearings v, r, of a roller w, the said bearings being movable
in the frame r. The straining device is also provided with a power-measuring
device for the purpose of measuring the strain put on the belt. This device
consists of projections a, a, which are rigidly fixed to the spring u, and carry rods b
which rest with their ends together when the spring is in its normal (unstrained)
condition. When however pressure is applied to the spring the rods move away
from each other, and the extent of such motion serves to measure the force
exerted on the spring u, for which purpose a divided scale is provided.
To test and strain a driving belt, it is coiled upon the pulley k; its free end is
drawn through between the bars and the rollers w of the straining devices B,
and is attached to the shaft i by means of the wedge q, and then by rotating the
screw spindles t, the desired strain is exerted upon the belt by means of the
rollers w.

page_text: By rotating the shaft i, the belt is drawn through between the straining devices B
and coiled upon the shaft i.
We wish it to be particularly understood that we do not limit ourselves to the
precise details of construction herein before described and illustrated by the
accompanying drawing, but that we hold ourselves at liberty to make such
changes and alterations as fairly fall within the spirit and scope of our invention.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
(1.) The improved machine for stretching belts as hereinbefore described and
illustrated by the accompanying drawing.
(2.) A belt-stretching or straining machine consisting essentially of the frame A,
the stretching devices B, each of which consists of a roller the movable
bearings of which are adapted to be acted upon by means of a screw spindle t
and spring u, the shafts and i and the gearing for actuating the shaft i, all
combined, arranged and adapted to operate, as set forth.
(3.) In the machine for stretching driving belts, a device for guiding the belt,
consisting essentially of a shaft i or a bar / provided with a divided scale, and of
collars o or stops m, as set forth.
(4.) In a machine for stretching driving belts, the device for measuring the
strain put on the belts, substantially as hereinbefore described and illustrated by
the accompanying drawing.
Dated this 4th day of December 1894.
ROBERT E. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.