Improvements in Chains designed for Transmitting Power.
Year: 1892

page_text: Date of Application, 13th July, 1892
Complete Specification Left. 24th Mar., 1893-Accepted, 17th June, 1893
PROVISIONAL SPECIFICATION.
Improvements in Chains designed for Transmitting Power.
I HENRI DUBOULET, of 25 Grande Rue Horloger, Sedan, in the Republic of
France, do hereby declare the nature of this invention to be as follows:-
Up to the present time endless chains for transmitting power have been formed
by links which are punched out or cast and united by a pin forming an axis of
articulation for each of these links. This mode of uniting the links by a pin
possesses serious inconveniences both as regards the precision in the transmission
and the wear of the axis which is destroyed by a shearing action.
Attempts have been made to remedy these inconveniences by forming each link
of two pieces carrying at one extremity a pierced sleeve and at the other a pivot
entering this sleeve the two parts thus formed being connected by a pin as usual.
In this case the shearing action is not produced at the extremities of the pin, but in
the middle of the link between the two sleeves.
I have devised a mode of manufacturing an improved chain which possesses the
advantage of simplicity of the first system without having the inconveniences of the
same and which also remedies the defect of the chain the links of which consist of
two parts with a sleeve at the extremity.
My improved system is represented in the accompanying drawing to an enlarged
scale but only by way of example.
Figure 1 of this drawing represents a front view, partly in section of an endless
chain, constructed according to my said invention.
Figure 2 is a corresponding side elevation.
Figure 3 shows views of the separate parts constituting a link of my system.
Figure 4 shows a modification of the system, and
Figure 5 represents the separate parts of the same.
In this system the links are formed of two side-pieces a carrying at each
extremity a pivot 6 forming one piece with it and pierced as shown at c, Figure 3.
For constituting the link each of the side-pieces a, engages by its pivot with a
part d, in the form of a link having two holes e, each of these holes serving to
receive the pivots of the aforesaid side-pieces a forming two adjacent links; the
rivetted pin which unites these three parts has no other object than to hold the
links together and the entire strain bears upon the pivots, the diameter of which
is such as to offer considerable resistance against the shearing action.
In the modification shown in Figures 4 and 5 the link d is separated into two
rings or rollers e', e' connected by means of the cheek-pieces a having at each
extremity a pivot b¹ which is provided upon the side-pieces a under exactly the
same conditions as the pivots b.
The pivots 6 extend half way into the rings or rollers e', and the pivots b in
their turn fit into the pivots b', otherwise the system remains exactly the same as
that above described.
In this manner I obtain a chain which is stronger, of simpler construction and
consequently cheaper, and which possesses the advantage of gearing with precision
during the whole time of its employment.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Chains designed for Transmitting Power.
I, HENRI DUBOULET, of 25 Grande Rue Horloger, Sedan, in the Republic of
France Clock-maker 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 :-
Up to the present time endless chains for transmitting power have been formed
by links which are punched out or cast and united by a pin forming a pivot for
each of these links. This mode of uniting the links by a pin possesses serious
inconveniences both as regards the precision in the transmission and the wear of
the axis which is destroyed by a shearing action.
Attempts have been made to remedy these inconveniences by forming each link
of two pieces carrying at one extremity a pierced sleeve and at the other a pivot
entering this sleeve, the two parts thus formed being connected by a pin as
usual. In this case a shearing action is not produced at the extremities of the pin,
but in the middle of the link between the two sleeves.
I have devised a mode of manufacturing an improved chain which possesses the
advantage of simplicity of the first system without having the inconveniences of
the same, and which also remedies the defect of the chain the links of which
consist of two parts with a sleeve at the extremity.
My improved system is represented in the drawing left with my Provisional
Specification, but only by way of example.
Figure 1 represents a front view, partly in section of an endless chain constructed
according to my said invention.
Figure 2 is a corresponding side elevation.
Figure 3 shows views of the separate parts constituting a link of my system.
Figure 4 shows a modification of the system, and
Figure 5 represents the separate parts of the same.
In this system the links are formed of two side-pieces a carrying at each extremity
a pivot forming one piece with it and pierced as shown at c, Figure 3.
.
For constituting the link each of the side-pieces a engages by its pivot with a
part d in the form of a link having two holes e, each of these holes serving to
receive the pivots of the aforesaid side-pieces a forming two adjacent links; the
riveted pin which unites these three parts has no other object than to hold
the links together and the entire strain bears upon the pivots b, the diameter of
which is such as to offer considerable resistance to shearing action.
In the modification shown in Figures 4 and 5 the link d is separated into two
rings or rollers e¹ el connected by means of the cheek-pieces a¹ having at each
extremity a pivot 61 which is provided upon the side-pieces a under exactly the
same conditions as the pivots b.
The pivots b¹ extend half way into the rings or rollers e', and the pivots bin
their turn fit into the pivots b'; otherwise the system remains exactly the same as
that above described.
In this manner I obtain a chain which is stronger, of simpler construction and
consequently cheaper, and which possesses the advantage of gearing with precision
during the whole time of its employment.
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 :-
First. In a chain for transmitting power the arrangement of links characterized
by the combination of pieces or cheeks a provided with journals 6 with a double
link d and an axis or pin f, as herein described and represented in Figures 1, 2,

page_text: Second. In an improved chain for transmitting power the arrangement of the
links, characterized by the combination of pieces or cheeks a a¹ provided with
journals with simple rolls or sleeves e¹ and an axis or pin f as herein described
and represented in Figures 4, and 5 of the drawing.
Dated this 24th day of March 1893.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.