P
Year: 1887

page_text: We, DAVID GARDNER BROWN and WASHINGTON LANCASTER, respectively Machinist
and Wire Worker, both of the City and county of Philadelphia, State of Pennsylvania,
United States of America, 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:-
Our invention relates to certain new and useful improvements in Micrometer-Pipe-
Gages; of which the following is a full, clear, and exact description of the invention,
such as will enable others skilled in the art to which it appertains to make and use
the same, reference being had to the accompanying drawings, and to letters of reference
marked thereon, which form a part of this specification.
The object of this invention is to provide a device adapted to measure the inside
diameters or the differences in the dimensions of two or more diameters of a pipe or
cylinder with increased exactness or accuracy; and it consists in the arrangements
and combinations of parts, substantially as will be hereinafter set forth, and finally
embodied in the clauses of the claims.
Referring to the accompanying drawings, in which like letters of reference indicate
corresponding parts in each of the several figures, Fig. 1 is an elevation of our
improved gage, illustrating the mode of measuring the pipe or cylinder. Figs. 2
to 6 are views of the several parts thereof in detail, Fig. 3 being a side view of a ring
or collar to fit over the portion marked a. This collar is however not essential to our
invention. Fig. 7 is a view of an end piece or tip, of which there may be several of
different lengths, and which are used when it is desired to give the gage increased
length. Fig. 8 is a view of a sectional tip of which there may be several of different
lengths which tips are employed when it is desired to make the gage still longer, to
be adapted to measure cylinders of a comparative large size. Fig. 9 is a socket used
in coupling the several pieces together.
In said drawings, a is a slotted or split tube having ears b b, by which the sections
made by the slot may be drawn together by screws cc to take up wear. Said tube
is threaded on the inside to receive a threaded finger-piece, d, having a milled
flange, d', whereby the said piece may be the more easily turned, and a pointed end, e,
to engage the curved wall of the tube to be measured at one point, as shown in Fig. 1.
Upon and forming a part of said finger-piece d may be screwed a collar, f, a graduated
flange of which is adapted to over-lap and inclose a portion of the tube a, which
portion has an indicating-mark, g, running longitudinally therealong, by which
the distance of movement of the graduated piece may be calculated. The graduated
flange may be of one piece with the finger-piece d.

page_text: The screws of finger-piece and tube a are provided with forty threads to the
inch, while the flange of said finger-piece is marked off into twenty-five equal
spaces by graduative marks. It will thus be evident that by turning the collar and
finger-piece upon one another a distance equal to one of the spaces between the
graduation-marks the length of the tube and finger-piece, taken together, will be
increased or reduced one one-thousandth of an inch. Further movement increases or
diminishes the length relatively. At the opposite end of the tubular portion a the
same is pointed or provided with a removable pointed tip, h. For measuring small
tubes these tips are comparatively short, as in Fig. 2. In Fig. 7 is shown a larger
one, for use in measuring tubes of larger calibre.
For measuring still larger tubes or cylinders the tips are made in sections. (Shown
in Fig. 8.) These are first, a coupling-piece, ¹, to fasten the sectional tip of the tube a;
next, a tube, i, upon which is the thumb and finger piece i³, and one end of which
tube is slotted or split, as indicated at 2, then a nut, j, having a tapering threaded
interior, tending, when screwed on the split tube, to close the jaws thereof, and finally,
a pointed adjustable rod, l, which is held firmly in the tube by the clamping-nut j.
The tips, it will thus be seen, are interchangeable, the one to be selected depending
on the size of the tube or cylinder to be measured. The coupling piece shown in
Fig. 9 will be found convenient for joining the several sections and tips together as
may be required.
The parts being in their several relative positions, the size of bore of a tube or the
differences in the dimensions of the same may be readily evinced by turning the
graduated finger-piece and noticing the difference between the indicating mark and a
given graduation which had previously tallied with said mark.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is :-
1. In combination, a threaded piece, a, a ring or collar fitted thereon, as shown and
described, a threaded piece, d, a graduated collar or piece, f, and a removable tip, h,
said parts being arranged and adapted to operate substantially as set forth.
2. In combination, a threaded and split tube, a, having ears b, screws c, and an
indicating-mark, g, a graduated piece, f, a threaded and pointed piece, d, a pointed tip
removable from said tube a, and connected with a split tube, i, and a pointed rod, l,
said parts being arranged and adapted to operate substantially as and for the purposes
set forth.
3. In combination, in a pipe-gage, a threaded piece, a, having an indicating-mark,
a threaded piece, d, a graduated piece, f, and a removable tip, h, said parts being
arranged and combined substantially as set forth.
4. In combination, a threaded piece, a, a threaded and graduated finger-piece, and a
tip adapted to be coupled to said threaded piece a, said tip being formed of separable
sections, substantially as set forth.
5. In combination, the threaded and split tube a, having ears band screws c, and an
indicating-mark, g, a graduated piece, f, a threaded and pointed piece, d, and a pointed
tip removable from said tube a, consisting of a split tube, i, coupling h', nut j, and
pointed rod l, all said parts being arranged and combined substantially as and for the
purposes set forth.
D
100
1
100D