IMPROVEMENTS IN INTERNAL GAUGES FOR GAUGING HOLES, ALSO APPLICABLE FOR SOME OTHER SIMILAR PURPOSES
Year: 1884

page_text: I WILLIAM WHITTAM, of 188 Chapel St Salford, Manchester, in the County of
Lancaster, Steel Rule and Standard, Manufacturer do hereby declare the nature of
my Invention for IMPROVEMENTS IN INTERNAL GAUGES FOR GAUGING HOLES, ALSO
APPLICABLE FOR SOME OTHER SIMILAR PURPOSES to be as follows:-
My invention relates to improvements in internal gauges for gauging holes,
when in the course of formation or gauging spaces between objects to be fixed
equal at certain distances and has for its object to facilitate a most accurate and
easy setting of such gauges to the required size which heretofore has been done in
a very inefficient and defective manner.
Previous to my invention such gauges have been formed either of a piece of wire
cut to the required length and tapered at the ends thereof, or of two parts forming
a telescope and rendering the same serviceable for various sizes by expanding or
contrating the gauge and retaining and locking the same by means of a set screw.
In practice it has been found that the making of the first named form of gauge is
troublesome and difficult of being made accurate in size and liable to lose its
accuracy, through the ends thereof getting worn by constant use or getting bent,
besides the disadvantage of gauging only one size. These objections have led to
the construction of the second named telescopic form of gauge which can be set for
different sizes, but being defective of an easy and accurate adjustment.
To remedy these defects I construct two different forms of gauges the first form
being applicable for gauging holes of small diameter or spaces between objects to
be fixed short distances apart, the second form being applicable for gauging large
holes or spaces of almost any size. The first. named form of my improved gauge
consists of a hollow shank being provided with an internal thread of a very fine
pitch and open at one end to receive a needle which is provided with a thread of
the same pitch about half way of its length and a lock-nut. The extremities of
the said hollow shank and needle are tapered off to a point as in ordinary gauges.
It will thus be seen that the length of the gauge can be altered at leisure by
turning either the said hollow shank or needle in or out with little trouble and
great accuracy which could not be obtained previous to my invention.

page_text: When the gauge has been set to the required size the said lock nut is screwed
against the shoulder of the said hollow shank thus locking the two parts and
retaining the size.
The second form of my improved gauge consists also of a hollow shank similar
to the one already mentioned in my first form of improved gauge receiving a hollow
spindle in which the needle is fastened by means of a lock nut. This arrangement
has for its object to facilitate the use of different lengths of needles according to
requirement, the setting and locking of the gauge being accomplished exactly in
the same manner as described in my first arrangement.

page_text: "
I, WILLIAM WHITTAM of 188 Chapel St Salford, Manchester in the County of
Lancaster, Steel Rule and Standard Manufacturer, do hereby declare the nature of
my invention for IMPROVEMENTS IN INTERNAL GAUGES FOR GAUGING HOLES
ALSO APPLICABLE FOR SOME OTHER SIMILAR PURPOSES" and in what manner the
same is to be performed to be particularly described and ascertained in and by the
following statement:—
My invention relates to improvements in internal gauges for gauging holes when
in the course of formation or gauging spaces between objects to be fixed equal at
certain distances and has for its object to facilitate a most accurate & easy setting
of such gauges to the required size which heretofore has been done in a very
inefficient and defective manner.
And in order that my invention may be better understood I have caused to be
appended hereunto one sheet of drawing marked with letters of reference corre-
sponding letters indicating like parts in various figures.
Fig 1 on the said drawing represents a side elevation of a gauge for gauging
small holes or spaces, and Fig 2 is a longitudinal section thereof. Fig 3 is a side
elevation of a gauge for gauging large holes or spaces and Fig 4 is a longitudinal
section thereof.
In carrying out the first form of my invention see Figs 1 & 2 I make a hollow
shank a of suitable metal and form the same internally with a thread of a very
fine pitch one end of the said shank being made open to receive a needle b which
is about halfway of its length also formed with a thread of a corresponding pitch
and provided with a lock nut c The extremities of the said hollow shank and
needle are tapered off to a point as in ordinary gauges. It will thus be seen that
the length of the gauge can be altered at leisure by turning either the said hollow
shank or needle in or out with little trouble and set to the required size with great
accuracy, which could not be obtained previous to this, my invention. When the
gauge has been set to the required size the lock-nut c is screwed against the
shoulder or open end of the hollow shank a thus locking the shank and needle
together and retaining the size required.
Referring to the second form of my invention see Figs 3 and 4 I make a hollow
shank a which is similar in form to the shank a in Figs 1 and 2, and provide the
same with a hollow spindle or bush & the latter being formed with a thread and
shoulder e and provided with the locknut c This hollow spindle or bush receives
the needle b which is fastened therein by means of the lock nut f screwed on the
split end of the said spindle or bush. In order to facilitate the adjustment of the
needle b I employ a small spiral spring g in the hollow shank a which presses
against the end of the needle b and forces the needle out of the bush d as soon as
the same gets released by unlocking the lock nut c The extremities of the hollow
shank and needle are also tapered off as in ordinary gauges. This form of gauge
has for its object to facilitate the use of different lengths of needles according to
requirement which needle can easily be changed by simply unlocking the lock
nut f. The setting and locking of the gauge being accomplished in exactly the
same manner as described in my first form of gauge.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I would have it to be
understood that I claim :-
.
CLAIMS.
First The improved construction of internal gauge consisting of the needle b
which screws into the hollow shanke se and look mut
11

page_text: Second The improved construction of internal gauge consisting of the needle b
fitting into the bush d provided with a lock-nut c, such bush being capable of
being screwed in and out of the hollow shank a and retained in its position by
means of the lock nut c substantially as described and illustrated in the annexed
drawing by Figs. 3 & 4 for the purpose specified.