Improvements in Positive Driving Bands.
Year: 1897

page_text: Date of Application, 30th July, 1897-Accepted, 11th Sept., 1897
COMPLETE SPECIFICATION.
Improvements in Positive Driving Bands.
I, JOHN BEAMISH POWELL, of No. 5910 Wayne Avenue, Philadelphia, Pennsylvania,
United States of America, Inventor, 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 relates to an improved construction of positive driving band, in which
the use of links pivotally attached to each other is avoided, thus reducing friction
to a minimum and prolonging the life of the chain.
It further consists of novel details of construction all as will be hereinafter set
forth.
Referring to the accompanying drawings
Figure 1 represents a side elevation of a portion of a chain embodying my invention,
the same being shown mounted upon the sprocket wheels.
Figure 2 represents a plan view of a link and portions of resilient strips which are
secured to said link.
Figure 3 represents a vertical sectional view on line x-x Figure 2.
Figure 4 represents a plan view of one plate which is used to form a link.
Figure 5 represents a plan view of a plate the ends thereof being serrated.
Similar letters of reference indicate corresponding parts in the figures.
A designates a sprocket chain, the same consisting of the links B and the resilient
strips C, the links B are formed of plates D, E, which are suitably secured together by
the screws or bolts F, said plates having the openings G and H therein, for the
reception of the teeth J, K which are on their respective parts L and M.
The resilient strips C are adapted to be secured between the said plates D and E
and have the said screws or bolts F passing therethrough, which hold the same in
position.
On the inner face of one of the plates, in the present instance on D, is provided
the ridges or tongues N and P, which are adapted when the parts are assembled to
engage grooves in the strips C, the latter being provided with ridges Q, which enter
the depressions or grooves in the other plates, in the present instance in E, it being
thus seen that when the parts are assembled a very strong, durable joint is formed,
the separation of which cannot be effected without removing the screws.
If desired I may serrate the edges of the edges of the plates as at R, the
same action similarly to the ridges and grooves to assist in holding the parts. If
desired, rubber S or other suitable material may be placed upon the under side of the
plate nearest the sprocket wheel.
The operation of the device is readily seen, it being noticed that the chain will
correspond with the various shapes and sizes of the sprocket wheels, owing to the
resilient strips, the teeth of the sprockets entering the openings in the plates as will
be best understood from Figure 1.
It will be seen from the foregoing that a very strong durable, resilient and light
sprocket chain is produced and since the same has no joints or pivotally attached
parts, friction is reduced to a minimum and liability of the joints being injured by
dust getting therein is entirely obviated, it being also noted that no lubrication
is necessary.

page_text: It will of course be evident that by this construction, should any of the strips
break, or be injured, the same can be easily and quickly replaced by simply removing
the screws from the broken piece and inserting a new strip.
It will of course be evident that it is not necessary to form the strips with ridges
and depressions, a portion of the strip will be forced in the one plate by the ridge on
the other when the parts are assembled.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is
1st. A sprocket chain consisting of flexible strips and links to which said strips are
suitably attached.
2nd. A sprocket chain consisting of a plurality of links having openings therein
and strips of resilient material attached to said links.
3rd. A sprocket chain consisting of a plurality of links formed of plates, resilient
strips, the ends of which are secured between said plates.
4th. A sprocket chain having links formed of plates having openings therein,
resilient strips which are adapted to be secured between the plates and means on said
plates to assist in holding said strips in position.
5th. A sprocket chain having links formed of plates having openings therein,
means for securing said plates together, strips which are adapted to be secured
between said plates and tongues or grooves on said plates to assist in holding said
strips in position.
6th. A sprocket chain having links formed of plates openings therein, screws for
securing said plates together resilient strips through which the screws pass and hold
the same between said plates and tongues and grooves on said plates adapted to
engage said strips.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.