Metallic Packing for Piston and Valve Rods.
Year: 1898

page_text: Metallic Packing for Piston and Valve Rods.
HERBERT SINCLAIR, 19, The Avenue, Hornsey, London, N., Engineer, do hereby
declare the nature of this invention to be as follows:-
A simple means of rendering engine glands steam, air & water tight with a
minimum of friction. The accompanying drawings shew how this object is
attained. At the inner end of the stuffing-box is a spiral spring in compression
marked e, the outer end of which encircles a portion of a brass bush, d the latter
having its external end bevelled to receive a portion of a white-metal ring be made
in two parts; the outer end of which is kept in contact on its bevelled sides with a
solid brass ring c similarly shaped to receive a portion of each white-metal ring;
there being two of the same bi & b². The external end of the latter is partly
enclosed in a further solid brass ring a which has its outer side cut at right angles
to the rod & coming in contact with a faced recess on the stuffing box cover forms
a joint on the same. The white-metal rings therefore are kept in close contact
with the rod as shewn.
HERBERT SINCLAIR, Engineer, 19, The Avenue, Hornsey, London, N., do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
An improved means by which engine or other glands can be kept steam, air, or
water tight with a minimum of friction, & which can be fixed without alteration
to existing stuffing boxes.
To enable my invention to be readily understood; I will now more particularly
refer to the same by means of the drawings left with the Provisional Specification,
which are to be taken as part of this specification & read therewith.
Figure 1. is a part cross-section of the gland as filled complete.
2 is an elevation of the metallic packing rings.
"
3 is an elevation of the gland cover.
دو
The inner end of the spring E, which is in compression, abuts on the inner end
of the stuffing box. The outer end of this spring encases a brass bush d which is
made in halves.
The spring holds the two halves of the bush together, & also exerts a sufficient
pressure on the metallic packing ring 62-which is also made in halves-to cause

page_text: it to be kept in close contact with the rod, this by reason of both brass bush, &
metallic packing ring, being coned, or wedge shaped as shewn.
There is fixed between each metallic packing ring a solid brass ring c, which is
internally coned, on either side, so that the pressure exerted by the spring is trans-
mitted equally round the two metallic packing rings 1 & 2, thus keeping them
in close contact with the rod & preventing rocking, or uneven wear.
This ring c
is kept in a state of suspension & clear of the rod by the pressure upon it. The
outer metallic packing also made in halves-is kept in close contact on its
exterior side with the solid brass ring a, which has its outer end cut off at right
angles to the rod, & forming a faced joint with the recess of the gland cover,
renders it steam, air, or water tight. This cover is further slightly recessed to allow
of lubrication reaching the faced joint.
The combined action of the spring, bush & rings are thus adapted to press the
metallic packing rings into close contact with the rod & prevent leakage.
A certain amount of freedom is given to the packing to move in any direction,
for the purpose of accomodating itself to wear.
In the case of rods having the crosshead end much enlarged for the purpose of
strengthening the same at the cotter-hole; I slit the backs of the packing rings
slightly, & so give greater elasticity without increasing the resistance of the
spring.
It must be distinctly understood that I do not confine myself exclusively to the
precise arrangements shewn in the drawings for connecting the two halves of the
metallic packing rings b¹ & b², as I may use other equivalent means of preventing
leakage past them & also taking up the wear.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed I declare that what I
claim is:
1. In a metallic packing of the kind specified, the combination of spring & cone
ended bush, together with an internally coned solid ring, held in suspension &
relatively arranged to press the metallic packing rings into close contact with
the rod.
2. The combination of outer metallic packing ring, & solid brass ring, relatively
arranged, as set forth in the drawings left with the Provisional Specification.
Dated this 20th day of June 1898.
HERBERT SINCLAIR.