Improvements in Watch Keys.
Year: 1894

page_text: COMT LEIN DIUITATION.
Improvements in Watch Keys.
I WILLIAM THOMAS SMITH, of 288 Icknield Street, in the City of Birmingham,
Manufacturer, 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 relates to improvements in the construction of watch keys, and
has reference particularly to the tubular barrel. It is desirable in keys of this
class that at its front interior end or throat, its diameter should be less than at its
rear part, and also that an inner shoulder or abutment should be provided for the
interior spiral spring, and hence an extra interior piece or lining has been adopted,
and the object of this my invention is to produce this inner shoulder and a
contracted throat in an improved manner and without such extra piece or lining..
My invention, which admits of some modification in detail, consists as hereinafter
described, and in order to more clearly explain this my invention, I have appended
hereunto an illustrative sheet of drawings, upon which are figures and numbers of
reference, similar numbers referring throughout the several views to the same thing
or part.
Figs. 1 & 2 show in edge and front elevation, a blank of metal from which the
tubular exterior or barrel of the key may be made.
Figs. 3 & 4, are edge, and front elevations of this blank after it has been further
prepared for bending into the tubular form.
Figs. 5 & 6, are views in elevation and plan of the [same when bent into the
tubular form.
Fig. 7, is a general sectional view of the key, showing the position and function
of the aforesaid tubular or barrel part.
Figs. 8, 9, 10 & 11, show similar operations upon a modified shape or blank.
Figs. 12 & 13, show this modified blank bent into the tubular shape.
Fig. 14, is a general sectional view of the key with the modified exterior
barrel.
I will first describe it as made from the blank shown in Figs. 1 & 2.
I cut out a blank of metal 15, whose precise shape may be modified to suit
subsequent operations. This blank is then set back for a portion of its length as
shown at 16, in Figs. 3 & 4. It is then rolled or bent into the tubular form as seen
in Figs. 5 & 6, having, as will be seen, two diameters 17 and 18..
In the modification shown in Figs. 8 to 14 inclusive, I cut out a blank 19, which
is then subjected to press tools, by which the cross groove 20, and the inclined
end 21, is made. This is then bent round as in the former case into the tubular
form as seen in Figs. 12 & 13, so that an all round groove 20*, and a contracted or
diminished end 21 is thereby produced. In some instances I may make this
double diameter tube as seen in Figs. 5 & 6, by taking a length of solid drawn
tube and then reduce or "neck" the one end by suitable dies in the present well
known manner, or I may produce the barrel shown in Figs. 12 & 13, from a similar
length of solid tube, by necking in the groove 20, and closing in the throat 21, but
the method before described and shown made from a flat blank is preferred as being
the simplest. The now formed barrel and the jaws 22 and 23, cross bar 24,
clamps 25 and 26, spring 27, and push piece 28, &c., are further treated and
arranged together to complete the key in the ordinary well known manner, as
shown in Figs. 7 and 14. It will be seen that in each case the interior shoulder 29,
affords the necessary abutment for the spring 27, and at the same time the
throat 18 or 21°, serves as the binding collar for the exterior of the jaws 22 & 23.
ID:
1

page_text: Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. In the construction of watch keys such as are herein described, the com-
bination with the jaws 22 and 23, cross bar 24, clamps 25 and 26, spring 27, and
push piece 28 &c., of the tubular barrel, having the interior shoulder 29, and
reduced diameter 18, made and arranged substantially as described and shown in
Figs. 1 to 7.
2. In the construction of watch keys such as are herein described, the modified
combination with the jaws 22 and 23, cross bar 24, clamps 25 and 26, spring 27,
and push piece 28 &c., of the tubular barrel having the interior shoulder 29, and
the contracted throat 21", made and arranged, substantially as described and shown
.in. Figs. 8 to 14.
Dated this 22nd day of October 1894.
WILLIAM THOMAS SMITH.