IMPROVEMENTS IN THE CONSTRUCTION OF CLIP-PULLEYS
Year: 1883

page_text: LETTERS PATENT to Richard Wilder James Wilder and Henry Wilder all of
Wallingford in the county of Berks Engineers for an Invention of
IMPROVEMENTS IN THE CONSTRUCTION OF CLIP-PULLEYS
PROVISIONAL SPECIFICATION left by the said Richard Wilder, James
Wilder, and Henry Wilder at the Office of the Commissioners' of Patents on'
the 27th February 1883.
RICHARD WILDER, JAMES WILDER, and HENRY WILDER, all of Wallingford, in
the county of Berks, Engineers, "IMPROVEMENTS IN THE CONSTRUCTION OF
CLIP-PULLEYS
"
This invention relates to what are known as clip-pulleys or pulleys having clips
or "nippers" round their peripheries to grip a rope passing over them and prevent
the slipping of the same. Heretofore such pulleys have been constructed with
levers or clips pivotted round their peripheries and some arranged with springs to
nip the rope as the traction on it increases.
Now this involves considerable expense in making cores for castings and boring
out and fitting same.
Our invention is designed to produce clip-pulleys in a simpler, cheaper and
stronger manner than heretofore.
We make our pulley's either in one piece or in two halves bolted together, such
halves being either cast or swaged out.
The periphery of the pulley or of each half has a lip, flange, or flanges turning
inward or outward (preferably the former) a gap or gaps being left in such flange.
The clips are formed advantageously by malleable or plain castings of a size and
section to fit the rope and with a groove or grooves to fit on the flanges so as to
have a limited oscillation thereon. The clips carry opposite lugs abutting the one
on the other so as to make the opposite clips parallel.
A suitable bolt, stop (or stops) is placed between the pulley balves as an
abutment for the clips.
In building up a pulley the two halves (when made so) are bolted or tied
together and the clips in opposite pairs introduced through the gap and strung on
till the pulley is full when the gap is closed by a plate fastened by a bolt or
otherwise.
The biting surface of the clip may be roughened serrated or corrugated if
desired or even faced with rubber leather or other material.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Richard Wilder, James Wilder, and Henry Wilder in the Great
Seal Patent Office on the 25th August 1883.
RICHARD WILDER, JAMES WILDER, and HENRY WILDER all of Wallingford in
the County of Berks, Engineers "IMPROVEMENTS IN THE CONSTRUCTION OF
CLIP PULLEYS
"
This Invention relates to what are known as clip pulleys or pulleys having
clips or "nippers" round their peripheries to grip a rope passing over them and
prevent the slipping of the same. Heretofore such pulleys have been constructed
with levers or clips pivotted round their peripheries and some arranged with
springs to nip the rope as the traction on it increases.
Now this involves considerable expense in making cores for castings and boring
out and fitting same. Our invention is designed to produce clip pulleys in a
simpler, cheaper and stronger manner than heretofore.
We make our pulleys either in one piece or in two halves bolted together such
halves being either cast or swaged out.
The periphery of the pulley or of each half has a lip groove flange, or flanges
turning inward or outward (preferably the former) a gap or gaps being left in such
flange.
The clips are formed advantageously by malleable or plain castings of a size
and section to fit the rope and with a groove or grooves to fit on the flanges so
as to have a limited oscillation thereon. The clips carry opposite lugs abutting
the one on the other so as to make the opposite clips parallel.
'
A suitable bolt, stop (or stops) is placed between the pulley halves as an
abutment for the clips. In building up a pulley the two halves (when made so) are
bolted or tied together and the clips in opposite pairs introduced through the gap
and strung on till the pulley is full when the gap is closed by a plate fastened by
a bolt or otherwise.
The biting surface of the clip may be roughened, serrated or corrugated if desired
or even faced with rubber leather or other material.
And in order that our invention may be properly understood and carried into
practical effect' we have annexed the accompanying sheet of drawings and to the
figures and letters of reference thereon marked we now refer.
Figure 1 shews a vertical section of part of a pulley constructed according to our
invention.
Figure 2 side elevation of same.
Figure 3 elevation of a clip.
Figure 4 side view of "
gap" plate.
Figure 5 back view of same.
In these Figures A A are the pulley discs carrying peripheral flanges B projecting
inwardly. C are the clips having grooves D formed thereon or therewith to engage
with the flanges B. E are the abutinents on the clips more clearly shewn in
Figures 1 and 3 the one abutting on or engaging with the other. F are the distance
collars cast on either one or both the plates (or as shewn) in the form of set
washers the whole being secured by tie-bolts G G. H is the stop bolt or abutment
preventing the rotation of the clips on the flanges or other form of stop may be
used. I is the gap plate closing the gap or gaps through which the clips are
inserted and strung on the flanges. The large holes shewn are merely to lighten
out the discs A A.
For very large pulleys the rim may be cast rolled or formed in one or more
pieces and connected to the boss by spokes.

page_text: The pulley may be keyed to the shaft or otherwise secured so we have not
illustrated the principle of securing it to the shaft.
Instead of securing the two pulley discs by bolts etc they may if desired be
welded together after having been forged or swaged out.
It will be seen our invention possesses considerable advantage over the old
system of hinged clips as the periphery is not unduly weakened. The parts are
less liable to get out of order and may be readily taken to pieces and replaced
and from the construction the cost of making such pulleys is greatly reduced.
They can be equally adapted for hemp, hide or wire or compound ropes.
Having now described our invention and the best manner known to us of
performing the same we would have it understood that what we believe to be novel
and original and claim under the hereinbefore in part recited Letters Patent is :-
Firstly. Constructing clip pulleys with clips fitting or engaging on flanges
or grooves on their peripheries and having a limited oscillation thereon to grip or
nip the rope substantially as described.
Secondly. The combination of the peripheral flanged (or grooved) discs A A
having a gap or gaps to insert the clips, with the clips CC strung thereon and
with the distance pieces F F and abutment H substantially as described.
In witness whereof we the said Richard Wilder, James Wilder and Henry
Wilder have hereunto set our hands and seals this 24th day of August in the
year of our Lord One thousand eight hundred and eighty three.
DICHA DD WIT DED