Year: 1896

page_text: Date of Application, 1st Sept., 1898
Complete Specification Left, 27th May, 1897-Accepted, 3rd July, 1897

page_text: parts of the described coupling need not to be quarter nuts, but may also have a
larger or smaller part of a screw thread.
Dated this 1st day of September 1896
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C., Agents for Applicant.
I, KNUT EDVIN BERGSTRÖM, of Thorsgatan 7, Stockholm, Sweden, 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 pipe or hose union has been hitherto used which consists of two coupling boxes,
provided with screw threads, and in which two projections reach into the grooves in
each box, in such a manuer, that the boxes, press together the tubular pieces
connected with the ends of the hose or pipe. These unions however have two great
inconveniences as the contact surface of the said projections with the screw grooves
is so small, that the projection and also the screw threads of the screw grooves
are soon unequally worn, whilst the coupling parts are also easily loosened from one
another if the hoses, as it is often the case, are turned in the direction opposite
to that in which the coupling boxes are screwed together.
According to the present invention these inconveniences are avoided, by the
arrangement that the two projections of ench coupling box are replaced only by
a part of a turn of a screw which catches only in a part of a turn of a screw-nut
in each coupling box, and further in each of the coupling boxes is arranged a spring-
operated bolt, which, after the coupling together, prevent the boxes from turning too
much in the opposite direction.
In the drawing left with the provisional specification Figure 1 is a side view
of one part of a hose coupling constructed according to this invention; Fig. 2
is a vertical sectional view of the same; Fig. 3 is a plan view of the same; Fig. 4
is an end view of Fig. 3 and Fig. 5 is a horizontal sectional view of the coupling
when screwed together.
Similar letters of reference indicate the same parts in all the views.
On the ends of the hoso are fixed in the usual manner lengths of pipe at which are
provided with flanges b and therein arranged tightening rings of known form.
The coupling box c arranged upon each of the said pipes has a flange-like part d,
on the one side of which projects a screw-thread and diametrically opposite
is arranged a nut-thread f. The said screw- and nut-threads are suitable to engage
with the nut- and screw-threads of au identical coupling box as shown in Fig. 5. On
each box is arranged in an opening of the flange da bolt h operated by the spring g
which secures the coupling boxes in the screwed up position against automatic
loosening. This bolt h by screwing together the two coupling parts lies against the
screw threads and falls in behind the said thread e after both boxes have been turned
against one another one eighth revolution each. An unscrewing of the two
coupling parts is thus not possible, until tho bolts h of both boxes are pulled back.
When the coupling is to be put together or taken apart the bolts are withdrawn (by
putting the forefingers in the grooves on the outside ends of the bolt), while
the boxes are turned about one quarter turn when they become either locked
together or loose from each other, as the case may be.
In order that the screw-thread é may not be put in on the wrong place, that is
opposite the bolt h there are arranged on this place of each coupling box, projections i

page_text: which prevent the putting in of the screw thread e on this part of the coupling box,
without however opposing a resistance to the female thread.
When the boxes are screwed together as far as possible the friction between the
packing rings prevents the turning of the pipes and hoses. As it is often necessary
to turn one or more lengths of hose while coupled together, the screw-thread e and
nut-thread of each coupling are preferably inade nearly a quarter turn and the bolt
is placed about midway between the screw- and nut-thread. By turning the one hose
or coupling backwards, until the bolt stops the turning, the friction between the
packing rings will be lessened enough to allow the slipping of the packing rings
against each other so that one length of hose may be turned as much as necessary
without uncoupling.
Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed, I declare that what I
claim is :
1. A hose coupling box provided with a screw-thread of nearly a quarter turn on
the inside of a flange and corresponding nut-thread of about a quarter turn
diametrically opposite, and a bolt held in place by a spring or the like through the
flange between the said screw-thread and nut-thread, substantially as and for the
purpose set forth.
2. The combination with a hose coupling box provided with a screw-thread or the
like on one side and a corresponding nut-thread or the like diametrically opposite, of
a bolt held in place by a spring or the like in the flange between the said screw and
nut-thread, and one or more projections on the said flange opposite said bolt,
substantially as and for the purpose set forth.
1000
WALLACE FAIRWEATHER,
Of the firm of Cruikshank & Fairweather, Chartered Patent Agents,
62 Saint Vincent Street, Glasgow, Agent for the Applicant.