Improvements in the Means or Appliances for Guiding and Controlling Gasholders.
Year: 1895

page_text: Date of Application, 17th July, 1895
Complete Specification Left, 17th Apr., 1896-Accepted, 6th June, 1896
PROVISIONAL SPECIFICATION.
Improvements in the Means or Appliances for Guiding and
Controlling Gasholders.
We, EDWARD LLOYD PEASE, and ASHMORE, BENSON, PEASE AND CO. LD.,
Engineers, all of the Parkfield Works, Stockton-on-Tees, in the County of
Durham, do hereby declare the nature of this invention to be as follows:-
This invention relates to means or appliances for guiding and controlling gas-
holders, and is especially applicable to such means when constructed in the form
of ropes, chains or the like tensile appliances trained over pulleys in the manner
described in the Specifications of Letters Patent granted to Edward Lloyd Pease,
namely No. 18272 of 1888 and No. 7616 of 1890.
The object in view is to adjust the controlling strains transmitted through the
check ropes to the requirements of each lift of the holder by training the said
ropes over systems of pulleys in a manner analogous to the ordinary pulley block
construction, in which the lifting strain is transmitted through one or more folds
of the rope according to the amount of purchase required.
In order that the nature of this invention may be understood we will describe it
as applied to a two-lift holder.
In a two-lift holder it is found in practice that the strains developed in controlling
the top lift are less than one-half of the strains similarly developed in controlling
the lower lift, consequently when using the same check ropes for both lifts
with the usual uniforin or single purchase strains throughout, that is with the
like number of ropes carried over the top lift as are connected to the lower lift,
more ropes are used to control the top lift than are necessary, in order to provide
the requisite number of ropes for the lower lift.
By our invention we dispose the strains in question according to the requirements
of each lift, thereby dispensing with the necessity of having a redundant supply
of check ropes with their accessory mechanism for a higher lift in order to have
the requisite controlling power for a lower lift, and we effect our purpose by
training the check ropes over systems of pulleys by which the single purchase
strains of the top lift are developed into double purchase strains in the next lift
below, or the said strains are similarly developed from lift to lift in whatever is
found to be the required ratio.
A construction which may be taken as representing what is suitable for carrying
our invention into effect consists as follows: A check rope secured to the bottom
curb of the inner lift is trained over a pulley mounted on the dip of the outer or
bottom lift, and under a second pulley fixed on the bottom curb of the inner lift ;
the check rope is then led up across the crown of the top lift in the usual way and
under a pulley on the bottom curb of this lift, over a pulley on the dip of the
inner lift, and under a second pulley on the dip of the outer or bottom lift to its
point of connection on the top curb of the inner lift. This arrangement introduces
for the service of the inner lift a double purchase in the strains transmitted through
the check rope as against a single purchase in the strains which control the top lift,
which is the result required, inasmuch as that both lifts are served with the number
of ropes required for the top lift.
In the case of the bottom or outer lift, or where there is only one lift, the check
rone is led from its point of connection with the bottom curb over a pulley mounted

page_text: on the tank side, under a pulley on the bottom curb and over a second pulley on
the tank side, from which it is led so far round the holder under a pulley on the
tank side and over a pulley on the top curb, under a second pulley on the tank side
to its point of connection with the top curb. This gives a double purchase in the
check ropes applying the controlling strains required to keep the holder in the
erect position.
It will of course be readily understood that the arrangements described are to be
taken as representative of a variety of suitable means for carrying our invention
into effect, which would be modified as to the relative positions of the pulleys to
one another or two points of attachment of the check ropes to the holder and in
other matters of detail which can be readily varied to adapt the arrangement to
_the particular circumstances and structural conditions which may require to be
dealt with.
Dated this 13th day of July 1895.
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicants.
improvements in the means or Appliances for Guiding and
Controlling Gasholders.
We, EDWARD LLOYD PEASE, and ASHMORE, BENSON, PEASE AND CO., LD.,
Engineers, all of the Parkfield Works, Stockton-on-Tees, in the County of
Durham, 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 :-
This invention relates to means or appliances for guiding and controlling gas-
holders, and is especially applicable to such means or appliances when constructed
in the form of ropes, chains, or the like tensile appliances trained over pulleys in
the manner described in the Specifications of Letters Patent granted to Edward
Lloyd Pease, namely No. 18272 of 1888 and No. 7616 of 1890.
The object in view is mainly to adjust the controlling strains transmitted through
the check ropes to the requirements of each lift of the holder by training the said
ropes over systems of pulleys in a manner analogous to the ordinary pulley block
or sheave and rope arrangement in which the lifting strain is transmitted through
one or more folds of the rope according to the amount of purchase required, but
the system of training the check ropes in this manner can also be advantageously
applied to a single lift holder, in as much as an increased stability of the holder is
obtained.
And in order that the novelty and advantage of this invention may be fully
understood and readily and generally applied where ropes, chains or the like
tensile appliances are the means employed for guiding and controlling a gasholder
and for maintaining it in the level or working position with the requisite stability
we will now proceed to describe the same by referring to the sheet of drawings
hereto annexed in which examples are illustrated in the form of single and two lift
gasholders in the construction and working of which the essential features of this
invention are embodied as herein set forth."
Referring to the drawing it will be observed that each of the figures illustrates
the gasometer in elevation and that one way of applying our invention to a single
lift holder is shown in Fig. 1 and to a two lift holder in Figs. 2 and 3 whilst a
modified way is similarly illustrated in Fig. 4 as applied to a single lift holder and
in Fig. 5 to a two lift holder.
Referring to Fig. 1 the check rope which is secured to the holder at the point 3'

page_text: on the top curb and the point at the bottom curb is trained over the
pulleys cccc and c and two folds are formed one a¹ a² passing round the
pulleys and the other at a passing round the pulleys c c. The mechanical
advantage derived from this arrangement is a power factor of two or a double
purchase in as much as that the travel of the check rope between the pulleys c
and c is double the vertical movement of the holder or in other words the controlling
power of the check ropes on the irregular movement of the holder is doubled the
practical advantage of which is obvious.
In Fig. 2 the part of the check rope denoted by a³ in Fig. 1 is carried over an
inner lift by means of the additional pulleys c and c which inner lift is thereby
guided and controlled in the ordinary way, but a double purchase controlling power
is applied to the outer lift just as in Fig. 1.
In Fig. 3 the principle is carried one step further by means of additional pulleys
to increase the number of folds in the rope, and the arrangement applies a three
fold purchase to the controlling power of the check rope on the bottom or outer
lift in consequence, the inner lift being regulated as in the ordinary way.
Another convenient way of applying this invention is illustrated as adapted to
the outer or only lift of a holder in Fig. 4 and to both the outer and inner lifts of
the holder in Fig. 5.
In this arrangement the check rope is secured to and trained along the tank side.
In Fig. 4 6 62 are the points to which the rope is anchored between which pulleys
placed in the positions shown and by which folds are formed in the rope at a¹ a³
and at a and give by this means a double controlling power for maintaining the
stability of the holder.
In Fig. 5 the fold at a³ is carried up to the top curb of the inner lift and the
check rope is trained over pulleys in the manner shown, a¹ a² forming the
compensating fold on the bottom or outer lift, and a a7 the compensating fold on
the inner lift, so that a double controlling power for maintaining the stability of
the holder is applied in this case to either lift.
In a two lift holder it is found in practice that the strains developed in controlling
the top lift are less than one half of the strains similarly developed in controlling
the lower lift, consequently when using the same check ropes for both lifts, with the
usual uniform or single purchase controlling strains throughout, that is with the
like number of ropes carried over the top lift as are secured to the lower lift more
ropes are used to control the top lift than are necessary in order to provide the
requisite number of ropes for the lower lift.
By our invention we dispose the strains in question according to the requirements
of each lift, thereby dispensing with the necessity of having a redundant supply of
check ropes with their accessory mechanism for a higher lift in order to have the
requisite controlling power for a lower lift, and we effect our purpose by training
the check ropes over systems of' pulleys by which the single purchase strains of
the top lift are developed into double purchase strains in the next lift below,
or the said strains are similarly developed from lift to lift in whatever is found to
be the required ratio.
For instance the parts a³ of the rope in Fig. 2 apply a controlling strain to the
inner lift which is developed into a double purchase strain for controlling the
bottom or outer lift and which is the result required in as much as that both lifts
are served with the number of ropes required for the top lift. In the case of Fig. 5
where a double purchase strain is applied to both litts the arrangement could be
used in combination with that shown in Fig. 4 by placing them in alternate positions
round the holder so that each holder is served with a controlling strain according
to its requirements.
It will of course be readily understood that the arrangements described are to
be taken as representative of a variety of suitable means for carrying our invention
into effect, which would be modified as to the relative positions of the pulleys to
one another or to the points of attachment of the check ropes to the holder and
in other matters of detail which can be readily varied to adapt the arrangement to

page_text: the particular circumstances and structural conditions which may require to be
dealt with, including the application of the invention to holders of more than
two lifts.
We therefore do not limit ourselves to the precise details of our invention as
herein before specified and illustrated in the accompanying drawings because
equivalent modifications and variations can be made in such details and quite
consistent with the principle and characteristic features of our invention and we
declare that what we claim is :-
Firstly. The use in combination with gasholders of check ropes so trained over
pulleys that the strains are transmitted through folds of the rope and are thereby
developed into double or higher purchase controlling strains as the case may be,
substantially as and for the purpose as herein before described and illustrated by
way of example in the accompanying drawing.
Secondly. The combination of parts as a whole, constructed, combined and
operating together, substantially as and for the purpose hereinbefore described
with reference to the several figures of the accompanying drawing.
G. J. CLARKSON,
Chartered Patent Agent,
Stockton-on-Tees, Agent for the Applicants.