Year: 1888

page_text: Date of Application, 27th Jan., 1888
Complete Specification Left, 12th Sept., 1888
Complete Specification Accepted, 19th Oct., 1888
HERMANN VERING, Engineer, residing at Hamburg in the state of Hamburg,
German Empire, do hereby declare the nature of this invention to be as follows:-
My invention relates to pitch-chains employed in elevators, dredgers, excavators
and other like machinery, and its object is to reduce the friction and the wear between
the chains and the teeth of the sprocket-wheels or tumblers driving the same, and also
between the links of the chains and the connecting pins.
For the first purpose I provide the chains with rollers on which the driving teeth
act, the said rollers being either mounted on the pins connecting the links together,
or upon separate pins, or journalled in the links by means of pivots.
For the second purpose the faces of the links being opposite to each other, are
provided one hand with circular grooves, and, on the other hand, with like projections
engaging with the said grooves, but so as to leave between them and the bottom
of the corresponding grooves spaces which are filled with hemp or other suitable
material, packings being thus produced which prevent sand, &c., from penetrating
between the faces of the links inside of the packings. If preferred, both faces may
be provided with grooves for containing packings, which, in this case, are kept in their
place by special rings.
Moreover, the eyes of the links and the bolts or pins connecting the consecutive
links together, are so constructed and combined as that all open joints are avoided
through which sand, &c., might penetrate between the surfaces rubbing upon each
other. According to one arrangement in chains consisting of single and double links
alternating with each other, as usual, the said pins are each made in two halves
integral with the respective parts of the double link, or outer link-parts, and thus
forming pivots which project into the eye of the single or inner link, the said outer
link-parts being united by means of bolts passing through them, while the said pin-
halves or pivots are or may be arranged to abut against each other so as to keep the
outer link-parts a definite distance apart and to prevent them from pinching the
inner link and compressing the packings to a prejudicial extent. This object may,
however, also be attained by special distance-pieces.

page_text: According to another arrangement each pin forms a separate piece, inserted with
ts ends into the eyes of the two outer link-parts which are closed outside, so that the
ends of the pins are covered up. In this case the pins, being made of suitable
length, may, in abutting against the bottom of the said eyes, again serve to keep the
outer link-parts the proper distance apart, the said link-parts being united by bolts
passing through them by the side of the eyes.
A third arrangement consists in forming the ends of the pins conically or with
shoulders, in inserting them tightly into the eyes of the outer link-parts and screwing
nuts on both ends.
In case the said pins are made hollow and closed at their ends, while being provided
with lateral orifices, they may serve as lubricators.

page_text: COMPLETE SPECIFICATION.
Improvements in Pitch-chains.
I, HERMANN VERING, Engineer, residing at Hamburg in the state of Hamburg,
German Empire, 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 pitch-chains employed in elevators, dredgers, excavators
and other like machinery, and its object is to reduce the friction and the wear between
the chains and the teeth of the sprocket-wheels or tumblers driving the same, and also
between the links of the chains and the connecting or joint-pins.
For this purpose the chains are provided with rollers on which the driving-teeth
act, the faces of the eyes of the links being opposite to each other are fitted with
packings, and the joint pins are so constructed and combined with the links that
sand, &c., is prevented from penetrating between the said faces and into the joints
between the links and the pins, and finally the said pins are arranged to form lubri-
cators by being made hollow and provided with lateral orifices.
On the annexod sheet of drawings Fig. 1 shows in elevation with some parts in
section, the tumbler of an excavator and a portion of a bucket-chain. Fig. 2 is a
section through the middle of the chain. According to these figures the chain is
fitted with rollers a journalled by means of pivots in the double or outside links kk,
the said rollers being so arranged that the teeth 6 of the tumbler are capable of
acting thereon. The rollers may, however, also be made in form of annular disks
turning on pins; and, if the links are bifurcated at their ends, the rollers may be
mounted on the pins g being in this case the joint-pins of the links.
Figures 3, 3, 4, 4 and 5 show different arrangements of the aforesaid packings
and of the joint-pins connecting together the consecutive links and k. According
to Figs. 3 and 3* the outer faces of the eyes of the link are provided with circular
grooves e, while the inner faces of the links & have like projections engaging with
the said grooves, but so as to leave between them and the bottom of the corresponding
grooves spaces, which are filled with hemp or other suitable material, packings being
thus produced which prevent sand and dirt from penetrating between the faces of
the links. If preferred the opposite faces of the eyes of both, the links and the
link-parts may be provided with grooves e for containing packings, as shown
by Figs. 4, 4 and 5, the said packings being, in this case, kept in their place by
rings f.
For completely closing the joints between the eyes of the links and the joint-pins
so as secure them against any passage of sand, &c. thereinto, different arrange-
ments are available. As shown by Fig. 3 the joint-pins are each made in two
halves cc integral with the respective parts of the double link, or outer link-
parts, thus forming pivots which project into the eye of the single or inner link 1,
the outer link parts kk being united by means of bolts g passing either through
the middle of the pivots c, as in Fig. 3, or by the side of the eyes of the links, as in

page_text: Fig. 4.
In view of keeping the link-parts kk a definite distance apart and preventing
them from pinching the link and compressing the packings to a prejudicial extent,
the pin-halves or pivots c are arranged to abut against each other. This object may,
however, also be attained by special distance-pieces, or, in case the bolts g are.
arranged as in Fig. 4, by providing these holis with two shoulders and with a nut at
either end.
arc
In the arrangement represented by Fig. 4, the joint-pin c forms a separate piece
inserted with its ends into the eyes of the link-parts kk, the said eyes being closed
outside, so that the ends of the pins are covered up. If, in this case, the pins
made of such length as to abut against the bottom of the eyes, they will again servo
to keep the link-parts the proper distance apart, the said parts being united by
bolts passing through them either as in Fig. 4 or in Fig. 3.
According to Fig. 5 the pins having their ends formed conically or with
shoulders, are fitted tightly into holes drilled entirely through the eyes of the link-
parts and fixed therein by nuts screwed on both ends.
In case the said pins are made hollow and closed at their ends while being provided
with lateral orifices, as shown in Figs. 4 and 5, they may serve as oil-reservoirs for
the continuous lubrication of the surfaces rubbing upon each other.
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. In pitch-chains for elevators, dredgers, excavators and other like machinery,
the transmission of power from the teeth of the sprocket-wheel or tumbler to the
chain through the medium of rollers combined with the said chains, substantially as
described.
2. In pitch-chains for elevators, dredgers, excavators and other like machinery,
the combination, with each other, of links kk and having circular grooves containing
packingse that are maintained in their place by projections for rings, means for con-
necting the links kk with the links, consisting either in pins c (Fig. 3) composed of
two halves integral with the links kk, or in pins c¹ (Fig. 4) inserted with their ends
into the eyes of the links kk, which are closed outside, or in pins e (Fig. 5) fitted
tightly into the said eyes, and means for firmly securing the links kk to each other,
the said links being kept a definite distance apart either by the pins or by other
equivalent devices, substantially as and for the purpose specified.
3. In pitch-chains having packings e and pins c, c¹ or such as "described and
claimed, the construction of the said pins with hollow spaces closed at the ends,
and having lateral orifices, so as to adapt the pins to serve as oil-reservoirs, substantially
as hereinbefore set forth.
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