Improvements in Swivel Connections, chiefly designed for use with Air Pumps for Inflating Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 14th Feb,, 1898-Accepted, 26th Mar., 1898
[Communicated from abroad by THE SCOVILL MANUFACTURING COMPANY, a
corporation located and doing business at Waterbury, in the County of
New Haven, State of Connecticut, United States of America.]
Improvements in Swivel Connections, chiefly designed for use with
Air Pumps for Inflating Pneumatic Tyres.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake & Co., Patent Agents, 45,
Southampton Buildings, in the County of Middlesex, 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:-
The invention is illustrated in the accompanying drawings forming part of this
application, and in which
Figure represents a view in elevation of the device.
Figure 2, a view thereof in central longitudinal section, with the operating-nut
frictionally coupled with the stem of the coupling-nut for the rotation thereof.
Figure 3, a similar view with the operating-nut turned inward for drawing the
parts of the device together so as to make it air-tight.
Figure 4, a detached view in longitudinal section of the coupling-head showing
the sockets formed in the opposite faces thereof.
Figure 5, a view showing the coupling-nut, the operating-nut, the friction-washer,
and the packing-washers.
This invention relates to an improvement in that class of swivel-connections
primarily designed for use in conjunction with the transmission tubes of those
air-pumps employed for inflating pneumatic bicycle-tires, the object being to
produce a simple and effective device, constructed with particular reference to
convenience of use by having its coupling-nut and the parts acting in conjunction
therewith, arranged at a right angle to the coupling-head, and therefore at a right
angle to the line of the transmission-tube which is attached to the shank of the
said head. On account of this peculiarity of the device, it will be hereafter called a
swivel-connection.
With these ends in view, the invention consists in a right-angle swivel-connection,
having certain details of construction as will be hereinafter described and pointed
out in the claims.
In carrying out the invention a coupling-head A is employed, having a
corrugated coupling-shank A¹, which is adapted for the attachment to it, in the
ordinary manner, of the transmission-tube of a pump. The said head is formed
with a diametric passage A2, which extends through it at a right angle to the line of
its shank A¹, and terminates at its ends in annular packing-receiving recesses A³ and A+.
The shank A¹ of the head is formed with a longitudinal air-passage A5, which at its
inner end intersects the passage A² aforesaid. In conjunction with this coupling-head,
a coupling-nut B is employed, which is externally threaded, and adapted to be
inserted into the valve of a bicycle-tire, the said nut being encircled at its base by
a packing-washer C, which is placed against the outer face of a knurled annular
lange B, formed at the base of the said nut. The said nut is furnished with_an.

page_text: integral cylindrical stem B2, having a circumferential groove B³ located about
midway of its length, and forming an air-passage, and having its extreme outer end
threaded as at B*. An air-passage b formed in the nut B, extends inward into the
stem thereof, where it meets a transverse hole d¹ extending inward into the stem
from the bottom of the circumferential groove B³. Upon the inner face of the
knurled annular flange B¹, an annular shoulder 62 is formed, adapted in diameter to
fit closely within the annular packing-recess A* of the coupling-head, the said
shoulder 2 being designed to place under pressure and confine a packing-washer D,
located in the bottom of the said recess. The outer end of the stem B² projects
beyond the opposite face of the coupling-head A¹, and is furnished at its extremity
with a washer E, which is rigidly secured in place, and which prevents the
operating-nut F from being detached from the said stem. The said operating-nut F
is interposed between the washer E and the recess A³, and mounted upon the said
threaded portion B4 of the stem. It is formed upon its inner face with an annular
shoulder f, adapted in diameter to closely fit within the annular packing-receiving
recess A³, and confines and places under pressure an annular packing-washer D₁,
located in the bottom of the said recess. The inner face of the said nut F is
counter-bored as at F¹, to receive the unthreaded outer portion of the stem B2, which
is left unthreaded up to a point very near its outer extremity, in order that its threads
may not encroach upon the packing-washer D¹, and so give a chance for leakage.
Attention is also called to the fact that the threads of the operating-nut are much
finer in pitch than the threads B4 upon the outer end of the stem of the
operating-nut. The object of this different in pitch of the threads will be explained
later on.
In using the device, the operating-nut F is turned so as to run it outward on the
threads B4 of the stem B2, until its outer face is jammed against the inner face of
the washer E with such force that a friction-coupling is established between the
threads of the said operating-nut and the threads B* of the stem of the coupling-nut,
as well as between the inner face of the washer and the outer face of the
operating-nut. The coupling-nut is then entered into the valve of the tire to be
inflated, and screwed thereinto through the medium of the operating-nut F and the
stem B2 which act as one piece as long as the operating-nut remains frictionally
coupled with the stem as described. Although the coupling between the
operating-nut and the stem is only a friction-coupling, it will be found sufficient in
power to permit the coupling-nut to be screwed into the valve by the operating-nut
for the reason that the threads of the coupling-nut are finer in pitch than the
threads B+ of the stem, and the co-acting threads of the operating-nut. After the
coupling-nut has been entered into the valve as required, it will tighten against
the top of the valve and offer more resistance to turning than is represented by the
friction coupling the operating-nut with the stem of the coupling-nut. When this
point is reached, the operating-nut will release and turn upon the stem, and travel
inward thereupon with the effect of engaging its shoulder f with the packing-washer D¹,
which will then be placed under pressure. This pressure will then be communicated,
through the stem of the operating-nut and the shoulder 62, to the packing-washer D,
which will also be placed under pressure. In this manner the shoulders of the
operating-nut and of the coupling-nut will be drawn toward each other with the
effect of compressing both of the washers which pack the stem, whereby the chance
of leakage is reduced to the minimum. It will thus be seen that after the
operating-nut has been employed for turning the coupling-nut into the valve, it
is then employed for tightening up the parts of the device so as to impose enough
pressure upon the packing-washers thereof to make the device perfectly air-tight at
the time the compressed air is forced through the device into the tire.
In removing the device from the valve, the operating-nut is first released on
account of the described differentiation in the screw-threads, and travels outward on
the threaded end of the coupling-stem, until it jams against the washer, after which
it becomes bound upon the stem, which is then turned by it for unscrewing the
coupling-nut from the valve.

page_text: Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondents, I declare that what I claim is :-
1. A right-angle swivel-connection having its coupling-nut and the parts operating
in conjunction therewith arranged at a right angle to the shank with which it is
provided for the attachment of the transmission tube.
2. A right-angle swivel-connection having a coupling head provided with a shank,
and having a diametric passage formed in it at a right angle to the said shank, a
coupling-nut provided with a stem which extends through the said passage and
projects beyond the said head, and an operating-nut applied to the projecting end of
the said stem.
3. A right-angle swivel-connection having a coupling head furnished with a shank,
and having a diametric passage formed in it at a right angle to the said shank, a
coupling-nut formed with a stem which extends through the said passage, and
projects beyond the said head, an operating-nut mounted upon the projecting
end of the stem which is threaded for the purpose, and a washer rigidly
secured to the extreme outer end of the stem and co-acting with the said
operating-nut.
4. A right-angle swivel-connection comprising a coupling-head having a shank, and
formed with a diametric passage arranged at a right angle to the said shank, and
terminating at its ends in packing-receiving recesses located in the opposite sides of
the said head, an operating-nut formed with an inwardly projecting, annular shoulder
extending into one of the said recesses, and with a stem which extends through the
passage in the head and projects beyond the other end thereof, an operating-nut
mounted upon the projecting end of the stem which is threaded for the purpose and
provided with an inwardly projecting annular shoulder which extends into the other
packing-receiving recess, packing-washers located in the bottoms of the said
recesses, and confined and placed under pressure by the said shoulders, and a washer
secured to the extreme outer end of the said stem, and preventing the operating-nut
from being detached therefrom.
Dated LLALL
1000
HASELTINE, LAKE, & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.