Improvements in Sheave-blocks.
Year: 1895

page_text: Date of Application, 15th July, 1895-Accepted, 24th Aug., 1895
Improvements in Sheave-blocks.
We, SQUIRE JONES RANDALL, and PATRICK ANDREW ALLEN of Moodyville,
British Columbia, Dominion of Canada, Gentlemen, 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 :-
The invention relates to tackle blocks, lead blocks, and the like, and the object
is to provide a closure for the same that will not become accidentally unfastened in
operation by recoils or other movements and to this end the invention consists
of the novel construction hereinafter particularly described and defined in the
claims.
Reference is to be had to the accompanying drawing forming a part of this
Specification in which similar letters of reference indicate corresponding parts in.
all the figures.
Figure 1 is a perspective view showing the closure in the open position, and
Figure 2 is a similar view showing the block closed.
The body of the block in its general features may be of any approved construction,
according to the purpose for which it is intended. The lead-block shown consists of
a yoke a, of which one arm a' is shorter than the other arm or member and to each
arm at the inner face is secured or welded a check plate b, to give a broad bearing
service to the side faces of the pulley c, which latter is of ordinary form and is.
secured in place by the pin d, as usual. To the upper end of the longer arm of the
yoke a one end of a latch bar e, is pivotally secured by a bolt or rivet f, and to.
this bar e, the usual hook 9, is swiveled.
The free end of the bar e, is formed with an inwardly-curved hook e¹ and this.
hooked end is adapted to receive and engage a link h, which is pivotally held to the
upper end of the short arm a¹ of the yoke the link being by preference substantially
of the form of an elongated chain link.
It will be seen that an accidental disengagement of the link and hooked latch
bar cannot occur even under the influence of recoils or other sudden or abnormal
movements of the block, although the attendant may effect a ready engagement or
disengagement when desired in shipping and unshipping the rope or engaging or
disengaging the swivel hook g. Further, the construction is simple and durable in
addition to its increased efficiency. At this point especial attention is directed to
the specific construction of the curved hook e at the free end of the latch bar e..
The book e is substantially scroll-shaped and the point of said hook lies above the
body of the latch bar and is disposed downward toward the centre of said bar
whereby the upper end of the link h that is engaged in said hook will be securely
retained therein and cannot become disengaged therefrom by an ordinary downward
movement or jarring of the said latch bar and it is therefore by reason of this
specifically shaped hook at the free end of the latch bar that provision is made for
the positive retention of one end of the link h, in engagement with the free end of
the latch bar.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is: --
The combination with a sheave-block yoke, of a swinging latch bar pivotally
connected at one end to the extremity of one arm of the yoke, and provided at its
1
11 1
L
id hook

page_text: lying above the plane of the body of the latch bar and being disposed downward
toward the centre thereof, and a link pivotally connected to one extremity of the
other arm of said yoke and adapted to have. a locking engagement with said scroll-
shaped hook, substantially as set forth.
BOULT & WADE,
Agents for the Applicants.