A New or Improved Device for Shifting Driving Belts and Bands.
Year: 1893

page_text: Date of Application, 2nd Aug., 1893
Complete Specification Left, 2nd May, 1894-Accepted, 2nd June, 1894
PROVISIONAL SPECIFICATION.
A New or Improved Device for Shifting Driving Belts and Bands.
We, MATTHEW BARR BAIRD of 59 Waterloo Street, Glasgow, Engineer, and
WILLIAM EWART, of Burnbank Road, Hamilton, Engineer, do hereby declare
the nature of this invention to be as follows :-
Our invention.relates to a new or improved device for shifting driving belts and
bands on stepped pulleys or cones.
The
The device consists of a bar or support which is carried in or on suitable brackets
or a frame fixed permanently in position. This bar or support which is capable of
being slid or travelled backwards and forwards by means of a rope, band, lever,
screw or equivalent has two studs or projections provided with coned rollers.
rollers are so fitted that their taper is in opposite directions. The sliding bar is
preferably so fitted or held in place that it is at an angle to the shafting and
parallel or nearly parallel with the surface of the stepped pulley or cone.
The driving belt or band passes between the two coned rollers and when the
sliding bar is shifted the belt or band is also shifted from step to step of the
pulley.
Under a modification the coned rollers may be fitted on or to a carrier which is
capable of being slid or run along or in a frame or support.
If so desired instead of using coned rollers a fork or its equivalent may be
employed.
.
The rollers may be cylindrical if so desired.
With the improved device the driving belt or band can be instantly shifted to
any desired step of the countershaft pulley or cone.
Dated this 1st day of August 1893.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.
COMPLETE SPECIFICATION.
A New or Improved Device for Shifting Driving Belts and Bands.
We, MATTHEW BARR BAIRD of 59 Waterloo Street, Glasgow, Engineer, and
WILLIAM EWART of Burnbank Road Hamilton, Engineer, 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:—
Our invention relates to a new or improved device for shifting driving belts and
bands on stepped pulleys or on cones as shown at Figs. 1 to 3.
The device consists of rollers or a fork or equivalent, which are, or is, so arranged
that they, or it, can be travelled backwards and forwards in order to shift the
driving belt, by a rope, band or other well known and suitable means.
And in order that our said invention may be properly understood we have
hereunto appended an explanatory sheet of drawings, whereon,
Fig. 1 is a front elevation of the device as it appears when applied to a stepped
pulley.
Fig. 2 is an end elevation.

page_text: Referring to the drawings whereon the same reference letters wherever repeated
indicate the same parts.
The device consists of a bar or support a which is carried in suitable
brackets b, b, or a frame, fixed permanently in position.
This bar or support a, which is capable of being slid or travelled backwards and
forwards by means of a rope c, has on it two studs or projections e, e', provided
with coned rollers d, d'. These rollers are so fitted as shown that their taper is in
opposite directions. The sliding bar a is, preferably, so fitted or held in place, as
shown, that it is at an angle to the shafting and parallel or nearly parallel with
the surfaces of the stepped pulley g, or the driving cone, as the case may be. The
rope c, which, as shown, is secured on or to a pin i on the bar a, passes over small
guide pulleys j, j secured to the brackets b, b¹.
The driving belt or band h passes between the two coned rollers d, d' and, when
the sliding bar a is shifted by means of the rope c the belt or band h is also shifted
from step to step of the pulley.
Under a modification as shown at Fig. 4, a travelling fork k may be used instead
of the coned rollers. In this case the fork, which embraces the driving belt h, as
shown, is fitted to a carrier / which is capable of lateral movement in a slot (not
shown) in a bar or support a secured rigidly to the brackets b, b. The carrier is
moved backwards or forwards, as desired, by means of the rope c, the ends c', c³ of
which are secured to hooks m, m² on a stud o projecting from the front of the
-carrier l.
If desired the coned rollers d, d¹ may be replaced by a fork, such as k, or
vice versa.
The rollers d, d' may be cylindrical if so desired.
It is to be understood that we do not confine ourselves to the precise method of
constructing the device shown on the annexed drawings, as it is evident that well
known mechanical equivalents, such as a screw arrangement, a band, levers or the
like may be used for shifting the bar a or the carrier as the case may be
backwards and forwards, instead of the rope c, and it is also evident that a
travelling carriage or the like may be substituted for the sliding carrier l.
With the improved device the driving belt or band can be instantly shifted to
-any desired step of the counter shaft pulley or to any part of the driving cone as
the case may be.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
.consider novel and desire to claim is
A device for shifting driving belts and bands constructed and operating,
-substantially as hereinbefore set forth.
Dated this 1st day of May 1894
H. D. FITZPATRICK,
70, Wellington Street, Glasgow, Agent.