Improvements in Driving-chains and Chain-wheels.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Driving-chains and Chain-wheels.
I, HERMANN OTTO KÖTTER, of Barmen, in the Kingdom of Prussia and
German Empire, Manufacturer, do hereby declare the nature of this said inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :-
The improvements in driving chains and chain wheels according to this invention
are represented in the annexed sheet of drawings, and consist so far as the chain is
concerned, of two parts, a frame link A constructed as shown in Figures 1 and 2,
a double hook shaped link B constructed as shewn in Figures 3 and 4, which said
parts A and B follow one another alternately in making up the chain. The frame
shaped links A. are of such dimensions that the strain on the material is not too
great in proportion to the force acting thereon, and the inner opening of the same
is so proportioned as to fit or connect with the neighbouring links.
Hook shaped links (which hitherto have been made of the shape shown at B',
Figure 5) according to the invention have before being placed in the chain, the
form shewn at B2, Figure 6, that is in the finished chain the hook points S. S. are
bent together at the bulge so as to lay tightly against the same. The distance of
the points S. S. from the bulge before fixing is great enough to admit of the
hanging in of the neighbouring link. If the chain links are made of a material
such as soft forged sheet steel, the points S. S can be bent down after introducing
the links A, and also can be opened repeatedly when required to disconnect them
without materially injuring the strength. On the other hand the construction of
the chain links admits of the use of forged or wrought iron, or other metal instead
of cast iron or other metal ordinarily used for such kinds of chains.
The above mentioned shape of the hook of the chain link forms part of the
invention here dealt with, and has for its object the prevention (in case of the chain
becoming slack) of the disconnection of the individual links, as has been hitherto
the case with the ordinary chain construction.
In connection with this improvement there is the advantage that it becomes
possible to do without the four side wings shewn in Figure 3, which are a necessary
appendix to chains as at present known. Without these side wings the hook link
has the appearance shown in Figure 7.
2°
The hook link B has also in the middle a groove shaped in-bend 1, Figure 4; the
object of which is to transfer the motion of the chain to the chain wheel, which is
attained by the bend laying itself onto a corresponding projection t, see Figure 8,
on the chain wheel, producing in this manner a kind of tooth wheel action. By
this mode of action of the chain on the wheel, further advantages are attained:
first, that the chain and wheel work without noise, as the grooves r lay themselves
without slipping onto the projection t; and secondly, that the locking of the, links
is prevented by doing away with the action of slipping.
A driving chain composed of the above described links is represented in Figures 8
and 9, also the chain wheel belonging thereto. designates the teeth customary in
the constructions now in use, and they lay into the links A without gripping and
serve only for greater security in the action, preventing in cases of violent shocks
or oscillations, the disengagement of the chain.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. A chain composed of links A and links B substantially as set forth.
2. A hook shaped chain link having laps or points, such laps or points being

page_text: 3. A driving chain consisting of frame shaped and hook shaped links, constructed
as described, and wherein points S S upon the hook shaped links are bent down
after being joined to the other links against the bend r, thus preventing the discon-
necting of the chain links, and said bend being adapted to lay itself onto a chain
wheel provided with projections t as and for the purposes described.
Dated this 27th day of December 1890.
CHEESBROUGH & ROYSTON,
15, Water Street, Liverpool, Applicant's Patent Agents.