Improvements in or relating to Resilient Pneumatic Cushions and to Housings or Bearings therefor.
Year: 1896

page_text: Date of Application, 24th. Dec., 1896
Complete Specification Left, 25th Oct., 1897-Accepted; 4th Dec.; 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Resilient Pneumatic Cushions and
to Housings or Bearings therefor.
I, BRUCE GREEN of 65 and 66 Chancery lane, in the county of London, Gentleman
do hereby declare the nature of this invention to be as follows.
This invention relates to that class of pneumatic cushioning devices' in which
the two members of a telescopically sliding pair of tubes or tube and rod are
severally provided with annular enlargements between which said enlargements
an annular pneumatic cushion is placed surrounding the said tubes or tube and rod
in such a manner as to provide a resilient cushion between said enlargements and
consequently such as to take up and absorb end-thrust in snid members.
Heretofore such cushions when inflated embracing the members' firmly have
prevented to a great extent by the adherence of their inner walls the required' action
of the cushion and the outer parts of the cushion-containing the' main body of the
enclosed air are rendered practically inoperative.
According to this invention I so make the angular cushion' that it can embraco
the meinbers only for a distance short of their entire length between the aforesaid
enlargements and I shape the enlargements so that they have bearing on the
cushion not immediately where the enlargements' spring from the members but at a
distance therefrom so that in effect a central annular space is left at each end of the
cushion between the same and the more central parts of the enlargements and
the action of the latter is thus not impeded by the adherence of the cushion' to the
members since there is; by the said space, sufficient play left for the approach of the
enlargements to each other before they come in contact with the part of the cushion
that when inflated is in adherence with the members:
With this construction I may adapt the form of enlargement' in which one is
prolonged to enclose the exterior of the cushion and I preferably then make this
enlargement in the form of a cup which commencing in a conical or ogival form'
continues in a cylindrical form to its extremity or of a substantially similar form in
which the cushion may be placed so as when inflated to have bedring or at least
principal bearing in the wider part of the conical portion of the cup' and at this
place I preferably place the inflating valve. Such' form of cup' is of sufficient
strength, leaves the required end space and affords in' action' a' compressive force on
the cushion acting somewhat towards the centre or axis so that the cushion is not
liable to be burst and full advantage is taken of the compressed air therein where it
is most effective in the action required' in these cushions!
i
The counter enlargement is preferably' interiorly of a shallow cup form gradually
passing as it extends outwards from the axis into a flat form that is to say into a
plane perpendicular to the axis'; exteriorly of the form of a' portion of a sphere or
spheroid,

page_text: Improvements in or relating to Resilient Pneumatic Cushions and
to Housings or Bearings therefor.
I, BRUCE GREEN, of 65 and 66 Chancery Lane, in the county of London, Gentleman,
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 that class of pneumatic cushioning devices in which the
two members of a telescopically sliding pair of tube or tubes and rod are severally
provided with annular enlargements between which said enlargements an annular
pneumatic cushion is placed surrounding the said tube or tubes and rod in such
manner as to provide a resilient cushion between said enlargements and consequently
such as to take up and absorb end-thrust in said members.
Heretofore such cushions when inflated, embracing the members firmly, have
prevented, to a great extent, by the adherence of their inner walls, the required
action of the cushion, and the outer parts of the cushion containing the main body
of the enclosed air, are rendered practically inoperative.
According to this invention I so make the annular cushion that it can embrace the
members only for a distance short of their entire length between the aforesaid
enlargements, and I shape the enlargements or either of them so that they have
bearing on the cushion not immediately where the enlargements spring from the
members, but at a distance therefrom, so that in effect a central anuular space is
left at one or each end of the cushion between the same and the more central parts
of the enlargements, in such a mauner, that, the action of the latter is not impeded
by the adherence of the cushion to the members since there is, by the said space,
sufficient play left for the approach of the enlargements to each other before they
come in contact with the part of the cushion that when inflated is in adherence with
the members.
With this construction I may adapt the form of onlargements in which one is
prolonged to enclose the exterior of the cushion and I preferably then make this
enlargement in the form of a cup which commencing in a conical or ogival form
continues in a cylindrical form to its extremity or of a substantially similar form
in which the cushion may be placed so as when inflated to have bearing or at least
principal bearing in the wider part of the conical portion of the cup and at this place I
preferably place the inflating valve. Such form of cup is of sufficient strength, leaves the
required end space below and affords in action a compressive force on the cushion
acting somewhat towards the centre or axis so that the cushion is not liable to be
burst, and full advantage is taken of the compressed air therein where it is most
effective in the action required in these cushions.
The counter enlargement is preferably interiorly of a shallow cup form gradually
passing as it extends outwards from the axis into a flat form that is to say into a plane
perpendicular to the axis; exteriorly of the form of a portion of a sphere or
spheroid.
This invention is illustrated in the annexed drawing in which Fig. 1 is an exterior
elevation. Fig. 2 a longitudinal section, and Fig. 3 a plan view of the parts herein-
after referred to.
A and B are tubes sliding one in the other. C is the upper cup having bearing
against the collar or flange E on tube A and of ogival form, from a to b and
cylindrical form from b to c. D is the lower cup of which the inside e is of shallow
cup form gradually passing as it extends outwards from the axis into a flat form, the
outside f being of the form of a spheriod.

page_text: F represents a block that. may be inserted in the crown of cup C if the interior
pneumatic cushion is not made of a form to fill out this crown, it being in practise
more convenient to make the cusliion of a form to bear against a plane surface at
this end. G. G. denote spaces exterior of the cushion within the cups. H shows
the inflating valve which is of any suitable construction. I do not confine myself
to the form of construction of interior cushion illustrated in dotted lines which is
shown as an example only, of the position of the cushion in relation to the two
cups C. D.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. The combination of the two cups C and D the former being partly of ogival.or
conical form and continuing in the form of a cylinder, and the interior of the latter
being of a shallow cup form gradually passing into a plane perpendicular to the
axis.
2. The combination of the cups C and D shaped as described in claim 1 with an
interior pneumatic cushion arranged as hereinbefore described and having its valve
near the upper extremity of the cup C substantially as set forth and illustrated.
3. The combination with the tube B of the cup 1 resting thereon, the tube (or
rod) A adapted to slide in the tube B and having a collar or flange E and a cup C
of the form herein described having bearing against the collar E, the two cups C
and D forming an enclosed chamber for the pneumatic cushion and adapted to
co-operate therewith in the manner herein specified.
Dated this 25th day of October 1897.
HERBERT HADDAN & Co.
Agents to Applicant 18 Buckingham Street Strand W.C. London.