Year: 1899

page_text: I, JOHN HENRY LOWE, of 32, Forthbridge Road, Clapham Common, London,
S.W., Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in joint-making packing and its object
is a special method and appliance for sealing screw- or bolt holes in caps, covers
and plates of all kinds.
For this purpose I construct a grommet-washer or collar of any soft metal
such as copper or of compound metal such as brass, not liable to inelt or become
destroyed under ordinary heat, in the shape of a circular hollow casing-open
at the centre and closed all round and I fill it up with lead or jointing
cement of any kind.
This washer or collar which is strong enough to prevent the jointing material
from spreading at the edges, is arranged between the nut, rivet- or bolt-head and
the cap, cover or plate to be tightened or sealed.
The fixing bolt or screw passes through the washer or collar, the thread of the
bolt being cut to a sufficient depth or length as to be within the washer or collar
so that when the nut of the bolt is screwed home, the soft metal washer in the
shape of a casing is squeezed in such a manner, that its contents (the jointing
cement) come into close contact with and into the screw thread of the bolt as to
perfectly seal the passage, at the same time preventing the said cement from
spreading outside.
The washer, which is made in all sizes and of material suitable to the purpose,
may extend beyond the sides of the nut, the screwing home of the latter upon
the casing causing the same to be compressed so as to form a flange.
Instead of one grommet-washer only to each bolt or nut, more than one may be
fitted between it and the plate, or the collar may be composed of more than one
piece.
The essential feature of novelty consists in preventing by means of a hollow
circular casing, the joint cement from spreading out at the edges and to fill the
space between the bolt and the plate hole, thereby hermetically sealing the latter.

page_text: manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to improvements in joint-making packing, and its object
is a special method and appliance for sealing screw- or bolt holes in caps, covers
and plates of all kinds,
For this purpose I construct a grommet washer or collar of any soft metal
such as copper, or of compound metal such as brass, not liable to melt or become
destroyed under ordinary heat, in the shape of a circular hollow casing open at the
centre and closed all round-and I fill it up with lead or jointing cement of any
kind.
This washer or collar which is strong enough to prevent the jointing material
from spreading at the edges, is arranged between the nut, rivet or bolt head and
the cap, cover or plate to be tightened or sealed
The fixing bolt or screw passes through the washer or collar, the thead of the
bolt being cut to a sufficient dept or lenght as to be within the washer or collar,
so that, when the nut of the bolt is screwed home, the soft metal washer in the
shape of a casing is squeezed in such a manner, that its contents (the jointing
cement) come into close contact with and into the screw thread of the bolt as to
perfectly seal the passage, at the same time preventing the said cement from
spreading outside.
The essential feature of novelty consists in preventing, by means of a hollow
circular casing, the joint cement from spreading out at the edges, and to fill the
space between the bolt and the plate hole, thereby hermetically sealing the latter.
In order to make this invention fully understood, I have illustrated the same
in the accompanying drawings, as applied to three different kinds of joints.
In these drawings;
Fig. 1, represents the joining of two metallic plates by means of screws and
nuts, the washer being placed underneath the nut;
Fig. 2 shows the joining of two pipes;
Fig. 3 that of a tap with the main pipe;
Fig. 4 indicates the grommet washer or collar in a horizontal view, with a cross
section on the line 1-2.
The parts to be connected are marked a and a', the washer which constitutes
the subject matter of the invention, is indicated by , while represents the
outer casing enclosing the whole jointing material.
In Fig. 1 two plates and are connected by screw sealed by means of the
improved grommet washer d with its casing d.
In Fig. 2 two pipes a and a¹ are connected together in a well known manner
and sealed by the washer which is placed between socket or sleeve e and nut c.
In Fig. the tap a¹ is connected with the main pipe a in the usual manner and
sealed by grommet washer d, the casing of which entirely covers the jointing
material.
The grommet washer shown in Fig. 4, which is made in all sizes and of material
suitable for the purpose, may extend beyond the sides of the nut, the screwing
home of the latter upon the casing causing the same to be compressed so as to
form a flange.
Instead of one grommet washer only to each bolt or nut, more than one may be
fitted between it and the plate, or the collar may be composed of more than one
piece.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
1. The grommet washer in the shape of a circular hollow casing onon

page_text: centre and closed all round-filled up with lead or jointing cement of any kind,
substantially as described and illustrated in the accompanying drawings.
2. The application of the grommet washer under 1/ for sealing screw or bolt
holes in caps, covers and plates of all kinds, substantially as set forth and illus-
trated in the drawings.