Improvements in Belt Tightening and Shifting Devices.
Year: 1897

page_text: Date of Application, 13th Dec., 1897-Accepted, 7th May, 1898
COMPLETE SPECIFICATION.
Improvements in Belt Tightening and Shifting Devices.
I, PEMBROKE DECATOR HARTON, of Fairmount Avenue, and Fifteenth Street,
Philadelphia, County of Philadelphia and State of Pennsylvania, United States of
America, Manufacturer, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, reference being had to the accompany-
ing drawing, and to letters of reference marked thereon, which form a part of this
specification:--
My invention relates to a new and useful improvement in belt tightening and
shifting devices, and has for its object to provide means for facilitating the trans-
mission of power from one cone pulley to another and for the shifting of the belts
thereon, as well as the maintaining of said belts under proper tension.
With these ends in view, this invention consists in the details of construction
and combination of elements herein after set forth and then specifically desig-
nated by the claims.
In order that those skilled in the art to which this invention appertains may
understand how to make and use the same, the construction and operation will
now be described in detail, referring to the accompanying drawing forming a
part of this specification, in which-
Fig. 1 is a top view of two cone pulleys having my invention applied thereto;
Fig. 2, a side view of the same, and
Fig. 3, a detail end view of the adjustable roller arm.
In carrying out my invention as here embodied 9 and 10 represent side strips
which are adapted to be secured to the ceiling or other surface from which the
device is suspended, and from these side strips depend the hangers 1 and 2, 3
and 4, arranged in pairs as shown, and within these hangers are journaled the
shafts 5, one of which carries the cone pulley 7 while the other carries the cone
pulley 8, said cones being arranged reversely; that is to say, the small end of one
cone being opposite the large end of the other cone, and over these cones run
the belts 6, each of which is a comparatively narrow strip, and all making in the
aggregate a belt of sufficient width for transmitting power from one cone to the
other. Brackets 23 depend from the underside of the side strips 9 and 10 carrying
boxes in which is journaled a threaded rod 12, and this rod has upon one end
thereof a chain wheel 25 over which runs a chain 26, so that the threaded rod may
be revolved in either direction by a person in proximity to the machine with which
the belt-shifting device is connected.
A hub 13 which is threaded internally so as to serve as a nut is run upon the
threaded rod 12, by which means when the rod is revolved this nut will travel to
and fro thereon since this rod is held against longitudinal movement by its boxes.
Arms 14 and 15 are formed with the hub extending diametrically opposite from
each other, the latter having swiveled thereto an extension 21, and this extension
and the arm 14 are provided with adjustable ends 16 which are held secure by
means of the bolts 17, the adjustable ends 16 carry the rolls 19 and 22 which have

page_text: their faces divided into spaces by the webs 20, these spaces being equal in number
to the number of strands 6 of the belt.
It will be seen from the drawing that the roll 22 acts on the inside of the belts
close to the cone 8, while the roll 19 lies on the top of the belts close to the cone 7,
and this arrangement always insures the belts 6 moving true over the face of each of
said cones, and by turning the chain wheel 25 to the right or left, as before stated,
said rolls will cause the belts to move to one side or the other of the cones; the
pressure of the rolls upon the belts tightening the belts sufficiently to prevent
them from slipping. The threaded hub 13 is prevented from revolving with the
rod 12 by the arms 14 and 15, said arms being prevented from revolving by the
pulleys bearing upon the belts in conjunction with the counter balancing weight
of the arm 14 over the arm 15, the former being longer that the latter.
This construction I have found to be advantageous in machines where change-
able speed is required, and with my device the speed of any machine can be
changed by the operator without leaving his position.
I have illustrated that form of device that I think best, but do not wish to be
limited to the precise construction herein shown, as such changes as the substi-
tution of a number of separate rolls could be used to advantage instead of the large
one shown; again there could be a guide with webs on its under face that would
also accomplish the same result.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. In combination with two cone pulleys journaled parallel with each other and
arranged reversely, the belts 6 running side by side constituting means for trans-
mitting power from one cone to the other, and means--such as flanged rolls for
guiding and shifting the belts in unison, as specified.
2. In a belt tightener and shifter for cone pulleys, the combination of a threaded
rod journaled in suitable brackets, a threaded hub run upon said rod, said hub
having two arms each provided with an adjustable end on which is journaled a
roll, substantially as and for the purpose set forth.
3. In a belt tightener and shifter for cone pulleys, the combination of a jour-
naled threaded rod located between the cone pulleys, a threaded hub run upon
said rod, said hub having two arms, one of said arms having an extension swiveled
thereto, adjustable ends carried by the extension and arm, and rolls journaled upon
the ends, said rolls being divided into spaces by suitable webs formed therewith,
all substantially as and for the purpose set forth.
4. In a belt tightener and shifter, the combination with the cone pulleys and
the journaled threaded rod arranged parallel to the shafts of the pulleys, of a
threaded hub run upon said rod and carrying two arms, each of said arms sup-
porting a roller or guide, substantially as described.
5. In a belt tightener and shifter, the combination of the various parts of
mechanism substantially as above described in this specification and illustrated in
the accompanying drawing.
J. P. BAYLY,
18, Fulham Place, London, W., Agent for Applicant.