An Improvement in Spring Boxes for Measuring Tapes.
Year: 1891

page_text: Date of Application, 23rd Sept., 1891
Complete Specification Left, 18th June, 1892-Accepted, 23rd July, 1892
PROVISIONAL SPECIFICATION.
An Improvement in Spring Boxes for Measuring Tapes.
1, WILLIAM CHESTERMAN, of Bow Works, Sheffield, in the County of York,
Manufacturer, do hereby declare the nature of this invention to be as follows :-
In my Specification No. 12316 of 1885 I described means of making the spring
box of a measuring tape in one piece with its teeth, cut out of the metal. My
present invention relates to the manufacture of such spring boxes in a manner
which facilitates their construction, renders them somewhat lighter and gives a
somewhat increased space for the clicking arrangement. For this purpose, I first,
by means of a suitable punch and die, cup a disc of metal, and then, by means of a
second punch and die with a number of teeth, I force up a corresponding number of
tongues of the metal from the disc, these forming the required teeth projecting on
the side of the disc opposite to that on which the cup rim projects.
Dated this 23rd day of September 1891.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improvement in Spring Boxes for Measuring Tapes.
I, WILLIAM CHESTERMAN of Bow Works, Sheffield in the County of York,
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:-
In my Specification No. 12316 of 1885 I described means of making the spring box
of a measuring tape in one piece with its teeth cut out of the metal. My present inven-
tion relates to the manufacture of such spring boxes in a manner which facilitates their
construction, renders them somewhat lighter, and gives a somewhat increased_space
for the clicking arrangement. For this purpose I construct a spring box as I shall
describe referring to the accompanying drawings.
A metal disc A, shewn in plan and elevation at Figs. 1 and 2, is first pressed by
suitable punches and dies applied in the usual way into the cupped shape shewn in
section at Fig. 3. The cup A is then placed in a recess in a die as shewn in Fig. 5
and a punch, of which Fig. 4 is an elevation, is pressed through the bottom of the
cup punching a set of holes as shewn in the plan Fig. 7, but, owing to the rounded form
of the teeth of the punch Fig. 4 the metal displaced from each hole is not separated
from the cup but is bent back and turned down as a tongue, so that there is thus formed
a number of teeth as shewn in Fig. 6. The box being now trimmed with its uneven
edge cut off, the necessary holes are drilled or punched through the bottom and the
saw cuts for attaching tape and spring are made in the usual way completing the
box as shewn at Figs. 6 and 7.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
-
A spring box for a measuring tape, made by punching a metal disc into cup

page_text: form, and then pressing a suitably toothed punch through the bottom of the cup,
thus causing tongues of the metal to project as teeth, substantially as described.
Dated this 16th day of June 1892.
ABEL & IMRAY,
Agents for the Applicant.