A New or Improved Chain Lifting Pulley Block.
Year: 1890

page_text: Date of Application, 15th Aug., 1890
Complete Specification Left, 24th Apr., 1891-Accepted. 30th May, 1891
PROVISIONAL SPECIFICATION.
A New or Improved Chain Lifting Pulley Block.
We TANGYES LIMITED of Cornwall Works Soho in the County of Stafford
Engineers and RICHARD CHAPMAN of No. 44 Thomas Street Smethwick in the
County of Stafford Foreman Fitter do hereby declare the nature of this invention
to be as follows:-
The said invention consists of a chain lifting pulley block the parts of which are
constructed and combined and operate as hereinafter described.
In the general arrangement and construction of its parts the said new or improved
chain lifting pulley block resembles chain lifting pulley blocks as ordinarily con-
structed; but in order to give a more complete control over its action when the
suspended load is being lowered we modify certain parts as follows:-
Instead of fixing the hand chain wheel directly to the pinion shaft the said wheel
connected to the said shaft by making it screw thereon or preferably on a sleeve
keyed to the said shaft. The inner end of the said sleeve has a flange. The
ratchet wheel for sustaining the load works loosely on the said sleeve and between
the said ratchet wheel and the collar on the sleeve is a leather or other washer. A
similar washer may be placed between ratchet wheel and hand chain wheel.
When the hand chain wheel is by the action of the hand chain turned in the
direction proper for raising the load the said wheel advances on the screw of the
sleeve thereby binding the ratchet wheel the washers and the flange on the sleeve
together and in its further motion carries round the pinion shaft and raises the
load.
When it is desired to lower the load the hand chain wheel is reversed by pulling
the lowering side of the hand chain. The reverse motion of the hand chain wheel
causes it to retire on the screw on the sleeve. The pressure by which the ratchet
wheel was bound to the sleeve and pinion shaft being relaxed the load causes the
pinion shaft to perform a rotary motion contrary to that it performed on the raising
of the load. This motion causes the screwed sleeve to advance in the hand chain
wheel and thereby again bind the ratchet wheel to the flange on the sleeve thus
arresting the descending motion of the load. By the arrangement described the
operator has complete control of the descending load the said load being capable of
descending only when he pulls the lowering side of the hand chain.
Dated this 15th day of August 1890.
W. T. WHITEMAN,
Agent for the Applicants.
COMPLETE SPECIFICATION.
A New or Improved Chain Lifting Pulley Block.
We TANGYES LIMITED of Cornwall Works, Soho in the County of Stafford,
Engineers and RICHARD CHAPMAN of No. 44 Thomas Street Smethwick in the
County of Stafford, Foreman Fitter, do hereby declare the nature of the said invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
The said invention consists of a chain lifting pulley block the parts of which are
constructed and combined and operate as hereinafter described.
In the general arrangement and construction of its parts, the said new or improved
chain lifting pulley block resembles chain lifting pulley blocks as ordinarily
DO17

page_text: constructed but in order to give a more complete control over its action when the
suspended load is being lowered we modify certain parts as follows.
Instead of fixing the hand chain wheel directly to the pinion shaft, the said wheel
is connected to the said shaft by making it screw thereon, or preferably on a sleeve
keyed to the said shaft. The inner, end of the said sleeve has a Hange. The
ratchet wheel for sustaining the load works loosely on the said sleeve and between
the said ratchet wheel and the collar on the sleeve is a leather or other washer. A
similar washer may be placed between the ratchet wheel and the hand.chain wheel.
When the hand chain wheel is by the action of the hand chain turned in the
direction proper for raising the load, the said wheel advances on the screw of the
sleeve thereby binding the ratchet wheel the washers and the flange on the sleeve
together and in its further motion carries round the pinion shaft and raises the
load.
When it is desired to lower the load the hand chain wheel is reversed by pulling
the lowering side of the hand chain. The reverse motion of the hand chain wheel
causes it to retire on the screw on the sleeve. The pressure by which the ratchet
wheel was bound to the sleeve being relaxed the load causes the pinion shaft to
perform a rotary motion contrary to that it performed on the raising of the load.
This motion causes the screwed sleeve to advance in the hand chain wheel and
thereby again bind the ratchet wheel to the flange on the sleeve, thus arresting the
descending motion of the load. By the arrangement described the operator has
complete control of the descending load the said load being capable of descending
only when he pulls the lowering side of the hand chain.
Figure 1 of the accompanying drawing represents in end elevation and Figure 2
in vertical cross section a chain lifting pulley block constructed according to the
said invention.
Figure 3 represents in end elevation and side elevation partly in section the
screwed sleeve and ratchet wheel of the said pulley block detached drawn to a
larger scale.
The same letters of reference indicate the same parts in the several figures of
the drawing.
a is the pinion shaft and the pinion of the same gearing with the internal
toothed wheel e made in one piece with the lifting pulley block d over which the
lifting chain e carrying the hook f works as usual, the said internal toothed wheel c
and pulley block d working on the fixed axis ; y is the hand chain wheel over
which the hand chain , i works for operating the pulley block the lifting side of
the said hand chain being marked and the lowering side being marked is the
screwed sleeve keyed to the pinion shaft a so that the said sleeve and shaft move
together. On the inner end of the screwed sleeve is a flange k². The boss of the
hand chain wheel is screwed internally with a screw thread corresponding with
that on the sleeve and the said hand chain wheel is connected to the sleeve and
consequently to the pinion shaft to which it is keyed by making it screw on the said
sleeve as represented in the drawing.
Working loosely on the plain part of the screwed sleeve and between its flange k²
and the inner face of the hand chain wheel g, is the ratchet wheel for sustaining
the load the said ratchet wheel being bound to and released from the sleeve and
pinion shaft in the manner hereinafter described; mis the pawl of the ratchet wheel
turning in the pulley frame and slipping over the teeth of the bound or temporarily
fixed ratchet wheel during the raising of the load and engaging with the said teeth
and preventing the descent of the load. Between the ratchet wheel and the
collar of the sleeve is a washer and between the said ratchet wheel and the
inner face of the hand chain wheel is a similar washer p.
9
In order to raise the load hooked to the hook of the raising chain e the raising
side of the hand chain hi is pulled down as indicated by the arrow in Figure 1.
The partial rotation thus given to the hand chain wheel 9 causes, it to advance on
the screw of the sleeve k and thereby bind the ratchet wheel Z.between the said
hand chain wheel y, the washers up and the flange k² on the sleeve and thus fix the.

page_text: said ratchet wheel, through the keyed sleeve, to the pinion shaft a.
The parts
being thus bound together the further rotary motion of the hand chain wheel g
carries round the pinion shaft a and gives motion through the pinion b and internal
toothed wheel c to the pulley block d and the latter raises the load in the ordinary
way the now fixed ratchet wheel and its pawl in acting similarly to an ordinary
ratchet wheel and pawl for sustaining the load.
In order to lower the load the direction of the motion of the hand chain wheel
is reversed by pulling down the lowering side of the hand chain so as to move the
said chain in a direction contrary to that indicated by the arrow in Figure 1. The
motion thus given to the hand chain wheel g causes it by means of its screwed boss
to retire on the screw of the keyed sleeve kand thereby relax the pressure by which
the ratchet wheel was bound to the sleeve k. The released or loose screwed
sleeve rotating freely in the ratchet wheel permits of the descent of the load which
descending load causes the pinion shaft to perform a rotatory motion contrary to
that performed by it for raising the load. This reverse motion of the pinion shaft a
causes the screwed sleevek to advance in the screwed boss of the hand chain wheel g
thereby drawing inwards or advancing the said hand wheel and again binding the
ratchet wheel to the flange on the sleeve, thus arresting the descending motion of
the load.
It will thus be understood that the load is capable of descending only when the
operator pulls the lowering side of the hand chain; a very perfect control by the
operator over the descent of the suspended load is thereby obtained.
When additional power is required and there is ample head room for the lifting
pulley block the end of the lifting chain e instead of carrying the hook is turned
up so as to form a loop which is fixed to any convenient part of the framing of the
pulley block.
Figure 4 illustrates the modification in the framing which we use for this
arrangement, the turned up end of the chain e being attached to the snug z on the
framing. In the loop formed by the turned up chain e a bottom block is placed
which carries a hook to which the load is attached as illustrated in Figure 4.
Instead of using a separate screwed sleeve keyed to the pinion shaft, the pinion
shaft may itself be screwed and the hand chain wheel work upon the screwed end
of the pinion shaft. It is preferred however to use the keyed sleeve as represented
in the drawing.
Having now particularly described and ascertained the nature of the said inven-
tion and the manner in which the same is to be performed we declare that we claim
as the said invention of "A new or improved chain lifting pulley block"
The combination in a chain lifting pulley block of the parts hereinbefore
described and illustrated in the accompanying drawing for giving the operator
complete control over the descending load that is to say, the combination of a
loose ratchet wheel working on a screwed sleeve keyed to the pinion shaft of the
pulley block, or working on a plain portion of a screwed pinion shaft, with a hand
chain wheel having an internal screwed boss for screwing it upon the screwed sleeve,
or screwed part of the pinion shaft, the said loose ratchet wheel being hound to and
released from the sleeve or pinion shaft for the purposes and substantially as
described and illustrated.
Dated the Twenty-second day of April 1891.
TANGYES LIMITED.
J. J. Parkins, Secretary.
RICHARD CHAPMAN.