Springs for Packing or Expanding Rings of Pistons for Steam, Air, Gas, or other Engines, Pumps, and the like.
Year: 1894

page_text: Date of Application, 14th Aug., 1894
Complete Specification Left, 26th Sept., 1894-Accented, 22nd Dec., 1894
PROVISIONAL SPECIFICATION.
Springs for Packing or Expanding Rings of Pistons for Steam, Air,
Gas, or other Engines, Pumps, and the like.
I WALTER BAGSHAW of 37 Wilford Grove Nottingham Civil and Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:-
A helical spring is made by coiling upon a mandril of suitable shape, a core bar
of the necessary form is inserted in the interior of the spring, it is then compressed
in a pair of dies, the bottom part being concave and the upper part convex, by this
means is obtained a double spring of U form or shape one being within the other
and connected together at the points, the inner portion not necessarily being the
same shape as the outer, but may be altered as required.
The coil is afterwards opened out and bent to the required diameter, the ends
being connected or secured by plugs, sockets, tail pieces or other suitable means,
and may be made in one piece or in segments, of any metal or alloy either round,
square, oval or rectangular in shape or section.
Dated this 13th day of August 1894.
WALTER BAGSHAW.
Springs for Packing or Expanding Rings of Pistons for Steam, Air,
Gas, or other Engines, Pumps, and the like.
I WALTER BAGSHAW of No. 37. Wilford Grove Nottingham Civil and
Mechanical Engineer, 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:—
A helical spring is made by coiling upon a mandril of suitable shape, a core bar
of the necessary form is inserted in the interior of the spring, it is then compressed
in a pair of dies, the bottom part being concave, and the upper part convex, by
this means is obtained a double spring of U form or shape, one being within the
other and connected at the points, the inner portion not necessarily being the same
shape as the outer, but may be altered as required.
The spring is afterwards opened out and bent to the required diameter, the ends
being connected or secured by plugs sockets, tail pieces or other suitable means;
and may be made in one piece or in segments, of any metal or alloy, either round,
square, oval or rectangular in shape or section.
By this means, from a simple helical coil I obtain a spring of a compound
character, as the sides or points may be compressed so as to bear upon the inner
sides of the piston rings, and by its spring or expansion cause the rings to form a
steam tight face with the flanges of the piston covers or block.
The outer circumference or periphery of the spring is compressed, and by its
expansion when in position forces outwards the piston rings so as to form a steam
tight face between the rings and the cylinder, and at the same time allow each
piston ring to act independently, the spring being capable of adapting itself to the

page_text: varying diameters of the rings when affected by any alteration in the bore of the
cylinder owing to unequal wear.
The drawings A A A A A A shewn on the accompanying sheet, are sectional
elevations shewing some of the various forms that may be adopted or found most
suitable.
For the purpose of increasing the flexibility and elasticity of the packing or
spring, the inner loop may be made or set at an increased angle as shewn by the
side elevation Fig. B, or the sides of the inner loop may be curved as shewn in plan
Fig. C or the outer loop may also be made or set to an increased angle to the inner
loop, and to further increase the flexibility and elasticity of the spring or packing,
the coil may be flattened or curved at an angle to its axis, without materially
altering the shape of the rings of the coil or worm before being compressed between
the dies.
Figs. D and E give an end elevation and side elevation of a tail piece or plug
suitable for coupling or connecting the ends of the spring before being inserted
between the piston rings, and is made from a thin sheet of steel or flexible metal,
so as to adapt itself to the shape of the packing or spring and is kept in position
by means of the small lip H which is formed by being half punched from the
bottom thereof.
To increase the strength of the spring or allow for the wearing of the piston
rings separate links of suitable thickness are made and inserted between the ends,
and are held in position by the tail piece or plug.
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 :-
1. A compound spring having an inner and an outer loop of any suitable form
made from a helical spring or coil with or without its helix curved or flattened at
an angle to its axis.
2. A tail piece or plug with raised lip for connecting the ends.
3. The whole substantially as herein set forth and for the purpose or purposes
hereinbefore described.
Dated this 25th day of September 1804
WALTER BAGSHAW.