Improvements in Driving Chains.
Year: 1897

page_text: Date of Application, 8th May, 1897-Accepted, 3rd July, 1897
Improvements in Driving Chains.
I, EMIL LANDFRIED, of 27, Koniggratzerstrasse, Berlin, 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 relates to an improved driving chain of the kind wherein the side
plates forming the links are made detachable from the pins of the chain so as to
permit of readily lengthening or shortening the same.
In the accompanying drawing,
Figure 1 is an elevation of a piece of chain constructed according to my invention;
and,
Figure 2 is a sectional plan of the same;
"
Figures 3 and 4 are detail views illustrating the construction of the plates of the
links; and,
Figures 5, 6 and 7 are respectively an end view, a side view, and a plan of one of
the pins of the chain.
Figures 8 and 0 illustrate an elevation and a plan respectively of a modification
of my invention.
In constructing a chain according to my invention I make use of two series of
links a, a, b, b, connected by pins c, c cach link a being formed of two plates a¹, a¹
and cach link b of two plates b¹, b¹.
The pins c, c which are of a length corresponding with the width of the chain
have grooves d, d cut in them near each end of a width corresponding with the
thickness of the plates a, al the said grooves forming flanges or collars e, e at the
ends of the pins. The said pins are also cut away on opposite sides to such an
extent that flat surfaces f, f1 are formed, the latter having a width corresponding
with the thickness of the plates b1, 61.
The holes in the plates a, b are of the same shape as the sectional shape of the
ends of the pins from which portions have been cut away, the only difference
between the said plates 1, 61 being that whilst in the former the holes are cut or
formed with the longer dimension in the direction of the length of the plates, in
the latter the longer dimension is arranged transversely.
In building up a chain two plates b, b are passed over the ends of two pins c,'c
so that the flat surfaces f¹, f1 of the said pin are in the holes of the said plates.
Links a, a are then passed over the ends of the pins in a position at right angles to
the plates b, b as indicated by the dotted lines in figure 1, and then the said pins are
turned to align with the plates b, b in which position the flanges e, e project over
the portions of the plates adjacent to the holes in a manner which will be readily
understood by reference to figure 1.
It will be understood that the plates b1 of the links b have no movement relatively
with the pins c, c the movement between the links, when passing around a wheel,
taking place between the plates a¹ and the pins c. As the plates al can only
become detached from the pins c in a position at right angles to the plates band as
this position is never assumed when the chain is in use passing around a pulley it

page_text: will be obvious that there will be no liability of the parts of the chain becoming
inadvertently detached.
In practice I find it advantageous to place upon the pins c, c before applying the
link plates thereto, antifriction rollers g, g which rotate upon the said pins.
I sometimes dispense with the links formed of the plates b₁ and substitute
therefor blocks h, has shewn in figures 8 and 9; in this case the pins c, c are fixed
against rotation in the block so that the flat surfaces on the ends of the said pins
are at right angles to the length of the block.
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 :-
1. A driving chain wherein the links are composed of two sets of plates connected
by cross pins having flattened ends, one set of plates being slotted so as to hold the
said pins against rotation and the other set of plates being slotted to rotate
relatively with the said pins, substantially as described.
2. A driving chain composed of blocks connected by links the said blocks carrying
pins to which the plates are connected, the said pius being flattened in one direction
and the link plates having holes so shaped that they will only pass over the pins
when in a position substantially at right angles to the length of the blocks.
3. The manufacture and use of the improved driving chain hereinbefore described
and illustrated in the accompanying drawing.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.