Pulley Blocks.
Year: 1893

page_text: Date of Application, 24th Apr., 1893
Complete Specification Left, 4th Aug., 1893-Accepted, 9th Sept., 1893
PROVISIONAL SPECIFICATION.
Pulley Blocks.
JOSEPH THOMPSON PICKERING Managing Director of The Pickering Block and
Hoist Company Limited 2 Mount Pleasant Clerkenwell London W.C. Engineer do
hereby declare the nature of this invention to be as follows:-
My improvements consist in applying to the Pickering pulley block for which
Letters Patent were granted to Jonathan Pickering 3rd April 1867, No. 990 a new
form of framing and bell mouthed chain guides. In adopting these improvements
I retain the original mechanical movement but by my combination of parts 1 ensure
a more serviceable and efficient block working with less friction than hitherto.
I provide a cast malleable frame, on the centre boss of this I carry the load wheel,
the fixed toothed wheel has a centre boss through which the excentric bolt revolves.
The endless hand chain is prevented twisting and running off the wheel by passing
through bell mouthed guides, which are hung on the side bolts. The holes in guides
are shaped to the section of chain.
D
1 2000
JOS. T. PICKERING.
COMPLETE SPECIFICATION.
Pulley Blocks.
I, JOSEPH THOMPSON PICKERING, Managing Director of The Pickering Block
and Hoist Company Limited, 2 Mount Pleasant, Clerkenwell, London, W.C.,
Engineer, do hereby declare the nature of my said invention and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement :-
My improvements consist in applying to the Pickering pulley block, (for which
Letters Patent were granted to Jonathan Pickering, dated 3rd April 1867,
No. 990) a new form of framing, anti-friction bearings, and bell mouthed chain
guides.
In these improvements 1 retain the original mechanical movement, but by my
improved combination of parts, I ensure a more serviceable and efficient block,
working with less friction than hitherto. I provide a cast malleable frame. On
the centre boss of this frame I mount the load wheel. The fixed toothed wheel
has a central boss in which the excentric bolt revolves. The endless hand chain is
prevented twisting and removing off the wheel by passing through bell mouthed
guides, which are hung on the side bolts. The holes in the guides are shaped to
the section of the chain.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar letters of reference indicate corresponding parts.
Fig. 1 is a front elevation of my improved pulley block.
Fig. 2 is a side elevation.
Fig. 3 is a horizontal section, illustrating the general arrangement of my
combination.
Fig. 4 is an elevation, showing the anti-friction rollers surrounding the
excentric.
a is the frame of the pulley block, made of
a divided boss forming part of the frame a.
wheel c runs. d is an axle running in the
I Haine Rd 1
suitable section and strength. bb is
On one part of this boss the load
boss b. e is the fixed wheel, with

page_text: internal teeth, forming part of the frame a. fis the excentric, fast on the axle d.
g is the internal pinion. hh are antifriction rollers, fitted in the boss of the
pinion 9, and surrounding the excentric f, as shown in Figs. 3 and 4. k is the
sprocket wheel, fast on the axle d. mm are guide blocks attached to arms 2, n,
the latter being pivoted to the frame at o o. These blocks have cruciform
openings pp, through which the chain passes, and whereby the chain is guided and
prevented from twisting.
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 :-
:-
The general construction, arrangement, and combination of the several and
respective parts, together forming my improvements in pulley blocks, substantially
as herein before described and illustrated by the drawings.
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.