AN IMPROVED RYMER AND COUNTER-BORE OR PIN-DRILL
Year: 1872

page_text: LETTERS PATENT to James Forster Shedlock, of 27, Harrow Road,
Paddington Green, in the County of Middlesex, for the Invention
of "AN IMPROVED RYMER AND COUNTER-BORE OR PIN-DRILL."-A com.
munication from abroad by Alfred Shedlock, of New York, in the
United States of America.
Sealed the 12th April 1873, and dated the 16th October 1872.
PROVISIONAL SPECIFICATION left by the said James Forster Shedlock
at the Office of the Commissioners of Patents, with his Petition, on
the 16th October 1872.
I, JAMES FORSTER SHEDLOCK, of 27, Harrow Road, Paddington Green,
in the County of Middlesex, do hereby declare the nature of the said
Invention for "AN IMPROVED RYMER AND COUNTER-BORE OR PIN-DRILL," a
communication to me from abroad by Alfred Shedlock, of New York,
in the United States of America, to be as follows:-
A shank or mandril having wedge-shaped or conical projections made
thereon is fitted with two blocks, the outer sides and one end of which
are provided with cutting edges and the inner sides made with recesses
corresponding with the wedge-shaped or conical projections on the shank
or mandril. A bolt having a collar and a thread at one end is made to
screw into the end of the shank or mandril, and a cross head is carried
by the bolt against the collar of which it takes a bearing. The blocks

page_text: are held in position on the shank or mandril by means of the cross head,
the arms of which pass through the blocks and fitted at their ends with
nuts, and a screw which passes through the blocks and works in a slot
cut in the shank or mandril.
To expand or contract the blocks the bolt is forced into or withdrawn
from the shank or mandril when the blocks are carried up or down the
wedge-shaped or conical projections, and when in the required position
the nuts on the arms of the cross head and the screw passing through the
blocks are tightened up, thereby jamming the shank or mandril between
the blocks, making the whole perfectly rigid.
When using the tool as a counter-bore the cutting edges used are
those on the ends of the blocks, and the bolt takes the place of a guide
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Forster Shedlock in the Great Seal Patent
Office on the 16th April 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
FORSTER SHEDLOCK, of 27, Harrow Road, Paddington Green, in the
County of Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of October, in the
year of our Lord One thousand eight hundred and seventy-two, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said James Forster Shedlock, Her special
licence that I, the said James Forster Shedlock, my executors,
administrators, and assigns, or such others as I, the said James Forster
Shedlock, my executors, alministrators, and assigns, should at any
time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Inven-
tion for "AN IMPROVED RYMER AND COUNTER-BORE OR PIN-DRILL," a communi-
cation from Alfred Shedlock, of New York, in the United States of
America, upon the condition (amongst others) that I, the said James
Forster Shedlock, my exccutors or administrators, by an instrument in

page_text: writing under my, or their, or one of their hands and seals, should
particularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months next
and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said James Forster Shedlock, do
hereby declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement :—
The object of this Invention is the construction of an adjustable rymer
and counter-bore or pin-drill, and for which purpose a shank or mandril
is provided having wedge-shaped or conical projections, and over which
are fitted two blocks having corresponding recesses made on their inner
sides. The angles on the blocks are made with cutting edges, and the
ends of the blocks are provided with radial grooves which form cutters.
A bolt fitted with a collar and having a screw cut on its end is made to
fit a tapped hole in the end of the shank or mandril. A cross head
baving two arms screwed and fitted with nuts is placed on the bolt and
against the collar of which it takes a bearing. The two arms of the
cross head pass through holes made in the blocks, and which are counter-
sunk to allow the nuts to lay therein. A screw is made to pass through
the blocks at the opposite end to that at which the cross head. is placed,
and a slot is cut in the shank or mandril to allow this screw to pass when
the blocks are adjusted on the shank or mandril.
The blocks are made to expand or contract on the shank or mandril
by means of the bolt, which upon being turned will by its screwed end
enter the shank or mandril, and drawing it in the direction of the collar
force the wedge-shaped projections up the recesses in the blocks, and
consequently expand the blocks. By the reverse action of the bolt the
blocks ride down the wedge-shaped projections on the shank or
mandril.
When the blocks are set at the required distances the nuts on the
arms of the cross head and the screw passing through the blocks are
screwed home, thereby jamming the shank or mandril between the
blocks. That part of the bolt which projects beyond the blocks will
form a guide pin when the tool is used as a counter-bore or pin-drill.
If it is required the cutting edges of the blocks may be made serrated

page_text: so as to answer the same purpose as a tap, or the cutting edges can be
so formed that an under-cut hole can be made by the action of this tool.
And in order better to explain the nature of this Invention reference
is made to the accompanying Drawings. Similar letters of referenco
indicate the same parts in all the Figures.
DESCRIPTION OF DRAWINGS.
Fig. 1 is an end view; Fig. 2 is a section shewing the arrangements for
adjustment of cutters; Fig. 3 a section of blocks at that point where
the cross head passes through them; Fig. 4 a plan shewing in dotted
lines the shank or mandril enclosed in the blocks.
The shank or mandril A is provided with two or more wedge-shaped
The
projections B, B, on which the blocks C, C, are made to ride.
cross head F is fitted with nuts G, G, on the arms K, K, of which they
are capable of being screwed. The screw II is used for the purpose of
tightening up the blocks C, C, on the shank or mandril A. The slot I
is made in the shank or mandril A for the purpose of allowing the
screw to pass. The bolt D fitted with collar E passes through the
cross lead F and screws at O into the end of the shank or mandril A.
The cutting edges are shewn at J, J, J, J, and these cutting edges can
be made of any desirable form or outline.
Having now described the nature of this Invention, that which is
claimed as novel and which I desire to have secured is the method of
making an adjustable rymer and counter-bore or pin-drill by means of
the blocks provided with cutting edges being made to pass up or down
wedge-shaped or conical projections on a shank or mandril by a bolt and
cross head, the ends of which fitted with nuts and the scrow are the
means whereby the blocks are rigidly held in the required position.
In witness whereof, I, the said James Forster Shedlock, have
hereunto set my hand and seal, this Sixteenth day of April,
in the year of our Lord One thousand eight hundred and seventy-
JAMES FORSTER SHEDLOCK. (L.S.)