Improvements in the Manufacture of the Finger Grips of Pneumatic Tyre and other Inflators.
Year: 1892

page_text: Improvements in the Manufacture of the Finger Grips of Pneumatic
Tyre and other Inflators.
I, ROBERT FREDERICK HALL, of the R. F. Hall Manufacturing Company
Limited, of Sampson Road North Sparkbrook in the City of Birmingham, Manu-
acturer, 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 :-
This invention pertains to the manufacture or production of the finger grips or
finger bows, described and represented in Letters Patent, granted to me and bearing
date the 13th day of August 1891 No. 13633.
By my present invention, the production of the said finger grips or bows is
greatly simplified, and the cost of manufacture reduced.
Heretofore the said finger bows were produced separate from the inner tube of
an inflator or pump, by the process of casting, and then permanently connected to
the outer end of the said inner tube by brazing or soldering. The plug or screwed
connection of the said inner tube was made integral with the middle body part of
the said grips.
By this invention, the finger grips or bows, consisting of thumb and finger loops,
are made out of the metal of the end of the tube to form the hollow piston rod,
commonly called the inner tube, whilst the plug is made separate from the bows,
and affixed in its assigned position by brazing.
Figure 1 of the accompanying drawing, represents in front elevation, a pneumatic
tyre inflator or pump, having an inner tube or hollow piston rod, with finger grips
or finger bows made according to my invention.
Figure 2 represents a length of tubing, from which the said inner tube, having
finger grips or bows at its outer end, is made.
Figure 3 represents the said length of tubing, with the end to form the finger
grips slit or divided.
Figure 4 represents the tube Figure 3, with the slit or divided parts bent back,
and under, into bows or loops, disposed upon the two opposite sides of the outer end
of the said tube, and constituting finger grips, and by means of which the
instrument is held, whilst the cylinder part is reciprocated over the piston which
remains quiescent with the tube.
Figure 5 represents the plug, which is made from a short length of tubing,
separately.
Figure 6 is an edge view of Figure 4, with the thickness of the metal of the
bows shown in dotted lines, whilst the lower end of the tubing is represented in
section.
Figure 7 represents a complete section of the finger grip end of the inner tube or
hollow rod, whose inner end or other end is terminated by a piston.
In carrying out the manufacture of the said article or part as described, I take a
length of tubing Figure 2, and slit one end a² of the same down its middle,
forthing branches a³, which are turned outwards, and then bent inwards, into bows
or loops, as in Figure 4, and with the terminal ends a', being presented to the
sides of the metal, of the said end a², a little below the termination of the slitting.
By the turning back or outwards of the said branches or half ends a³, the finger
grip end of the tube is left open at a', wherein a plug b, screwed at one end at b¹,
and having a hole &, through its middle is affixed by brazing or soldering, as in
Figure 7, thus completing the finger bow end of the inner tube.
The plug, inay if necessary be plain instead of screwed, whilst the finger grips
may be made into the form of a † end, or curved back only to a portion of the

page_text: circle, or they may be made to stand at right angles, or nearly so, to the inner
tube, and with the terminal ends of these branches, if necessary, turned slightly
back.
To give a broader bearing to the grip, the metal of the said grips may be
flattened.
Instead of making the finger grips, bows or holders from out of the actual metal
of the end of one end of the inner tube, I may make the same together with the
plug, out of a separate length of tubing, affixed to the finger bow end of the
primary inner tube. Thus I take a shorter primary inner tube than usual, and a
short additional tubing, with one end slitted longitudinally, up to the part to form
the plug.
These divided ends are then fashioned into bows, and the unslit ends gathered in
and screwed. This bowed attachment is then connected, and secured by brazing
to the outer end of the inner tube of the inflator.
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 1
claim is :-
First In pneumatic tyre or other inflators or pumps, making the finger bows
or holders out of the metal at one end of the inner tube or hollow piston, by
longitudinally slitting the same, and then turning outwards and fashioning the said
divided ends or split or branched members into finger grips, bows, loops or holders,
as set forth.
Secondly In pneumatic tyre or other inflators or pumps, making the finger
grip ends, with a plug, in manner and in the way as described and set forth.
Thirdly In pneumatic tyre or other inflators or pumps, making the finger grip
ends with plug, from a single short length of partially slitted tubing, which is
brazed or soldered upon the finger bow end of the inner tube or piston, as
described.
Dated this 30th day of July 1892.
ROBERT FREDERICK HALL,
By Henry Skerrett,
6, Livery Street, Birmingham, Agent for Applicant.