Improvements in Belt and Rope Pullies.
Year: 1892

page_text: Date of Application, 17th Oct., 1892
Complete Specification Left, 11th July, 1893-Accepted, 12th Aug., 1893
PROVISIONAL SPECIFICATION.
Improvements in Belt and Rope Pullies.
I, ERNST HAMMESFAHR, of No. 7, Foche, Solingen, Prussia, in the German
Empire, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object to prevent the slipping of belts and ropes upon
pullies, and it consists in forming these with angular, or flat, faces, projections, or
recess, instead of making them perfectly circular as heretofore, so that the belt or
rope, in being bent more or less sharply over the edges of such flat faces,
projections or recesses, offer increased resistance to slipping.
The invention may also be carried out by constituting the periphery of the pulley
of pins, studs or bars fixed at certain distances apart either between two side discs
or projecting from a single disc.
By this invention not only is slipping of the belt or rope, and consequent loss of
power and wear, prevented, but also, the degree to which the belt is strained in
order to prevent slipping can be considerably decreased, and consequently also the
transverse strain on the shaft and its bearings is correspondingly lessened.
Dated this 17th day of October 1892.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Belt and Rope Pullies.
I, ERNST HAMMESFAHR, of No. 7 Foche, Solingen, Prussia in the German
Empire, Manufacturer 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 :-
My invention has for its object to prevent the slipping of belts and ropes upon
pullies, and it consists in forming these with angular or flat faces, projections or
recesses, instead of making them perfectly circular as heretofore, so that the belt
or rope, in being bent more or less sharply over the edges of such flat faces,
projections or recesses, offer increased resistance to slipping.
The invention may also be carried out by constituting the periphery of the
pulley of pins, studs or bars fixed at certain distances apart either between two
side discs or projecting from a single disc.
By this invention not only is slipping of the belt or rope, and consequent loss of
power and wear prevented, but also, the degree to which the belt is strained in
order to prevent slipping can be considerably decreased, and consequently also the
transverse strain on the shaft and its bearings is correspondingly lessened.
On the accompanying drawings are shewn various arrangements for carrying
out my above described invention.
Fig. 1 shews a belt pulley a having for example 12 flattened parts on the rim c;
Fig. 2 shews a rope pulley d with 16 flattened parts e at the bottom of the
groove f.
Fig. 3 shews a belt pulley a with curved hollows g in the rim c, over which the
belt is stretched.
Fig. 4 shews a belt pulley, the bearing surface of the rim of which is constituted
by separate transverse bars. These can be of any sectional form, such as angular
or rounded on the outer side, or in the form of bolts or round bars, as indicated
Di 17

page_text: at h h h², or such round bars may be provided with loose sleeves as at i. These
bars are secured with their ends in side cheeks k.
Fig 5 shews a rope pulley the periphery of which is formed of transverse
pieces for the rope to bear against rivetted to the side cheeks k;
Fig. 6 shews an arrangement in which the supporting studs * for the rope are
inade of a hook shape and project from the side of a single disc k.
Fig. 7 shews a similar construction of projecting pieces 5 for belt pullies.
As the belts or ropes cannot slip on pullies constructed as described, they are
less subject to wear or deterioration as they are not subject to friction or heating,
and they do not require to be stretched with excessive tightness, thus economising
in power and reducing the wear of the bearings.
In order to prevent the belts or ropes from always coming in contact at the same
places on the pullies, or from being bent at the same points, while the other parts
are not subject to this action, one or more of the flat places of the rim, or one or
more of the distances between the bars are made greater or smaller than the others.
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:
Belt and rope pullies the circular rims of which are provided with flat places
such as b, e, or recessed parts g, or are constituted by separate bars such as h h¹ h², i,
hhh, substantially as described with reference to the drawings.
Dated this 11th day of July 1893.
ABEL & IMRAY,
Agents for the Applicant.