Year: 1886

page_text: 1, JULIUS JUNGK, of the firm of G. A. Kroll and Company of Hannover, in the
Empire of Germany, 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 :—
-
In the ordinary method of constructing guides for ropes and chains as applied to
sheaves, pulleys, windlasses and the like; narrow ridges, fixed guide pieces or blocks ;
(in some cases applied to fixed or moveable arms), have been applied for the purpose
of keeping the chain or rope within or upon its groove or running part. By this inven-
tion guide arms are arranged so as to give the requisite guidance throughout their
length, which is at least equal to half the circumference of the sheave or pulley.
Figs. I and II of the accompanying drawing show a Weston differential pulley
block, constructed with two arms a, a, pivoted at their upper ends c, c, and having at
the lower ends a small roller e, e hung upon an axle carried by the two lugs d, d. The
guide arms a, a, are provided with a groove b, which extends the whole length of the
arm, this groove corresponding to the size and form, of the links of the chain, or, of
the rope (see Fig. 3, in section). The roller e is carried by the lugs d, d, at such a
distance from the groove b in the arm a, as to allow the chain or rope to move freely
up and down without friction, while preventing the same from slipping out of the
groove.
The upper portion of each arm is curved to correspond with the size of the pulley,
thus enclosing a large proportion of the circumference of the same, and as the groove b
is prolonged around the curved portion of the arm, the chain is securely guided to its
place in any position that may be given to the blocks. In this manner, two of these
guide arms take the place of the fourfold guide which has hitherto been used upon
Weston's differential pulley block, thus greatly simplifying its construction. The guide
arms a, as shown in section, Fig. 3, enter or fit closely between the flanges of the
sheave, and by their form and weight press the chain into the groove, and tend to
prevent any jerking or jumping of the chain, when the force or resistance is suddenly
applied thereto; the arms also wear longer from the friction being equally distributed
over the whole arm.

page_text: Similar guide arms may be used to guide ropes of grooved pulleys. For windlasses
with projecting catch flanges, the arms may be altered as shown in Figs. 4 and 5,
where the loop at the upper end of the arin is fixed by means of a square bolt, and the
connection of the loop or eye with the flange and lower part of the arm is established
by a strong spring extension, connecting the two parts of, and allowing a bending of
the arm.
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:
For guiding the chains or ropes of pulleys and windlasses, the arrangement of guide
arms a, which secure a correct up or down running of the chains or ropes, by means
of a groove along the whole length of the arms, and by means of their curved shape
adapted to the circumference of the pulley, and fitting between the projecting flanges
of the same; and either rotating or fixed at the loop end or eye c, by the bolt or axle
situated above but not connected with the pulley; or (when windlasses are used) the
arrangement of an elastic spring to allow of a change in the up or down direction ;
substantially as described.
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