Improvements in Tool Holders or Sockets for Drilling Machines.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Tool Holders or Sockets for Drilling Machines.
I, EDWARD SLOPER TOOMER, of Preston House, High Street, Sandwich, Gentle-
man, do hereby declare the nature of this invention to be as follows;-
A metal tube is ground or bored so as to fit tightly outside the boss which ends
the screw of a drilling machine; it is then plugged with a piece of beech or other
hard wood which has been first truly centered and cut with a square tapered socket
to fit the ordinary brace bits. Two holes are drilled in the metal tube; one to take
the screw on the boss and another to secure the plug with a second screw.
object of this invention is to check the vibration from the cogs of an amateur's
bench drill and prevent the crumbling or breaking of the bits.
The
For Morse or Cleveland drills the wooden plug requires special fitting if they
have straight shanks.
The length of the metal tube is less than two inches.
This is more clearly set forth as follows.
The improvement consists in fixing a wooden socket to the revolving rod of
a drilling machine.
The tool-holder consists of two parts a metal pipe or tube and a wooden socket.
The purpose of the metal pipe is to join the wooden socket to the boss of the
revolving rod; it has two holes in it that it may be screwed to each, to the socket
and the rod.
The purpose of making a wood socket is to dull the vibration of the cogwheels
and prevent the drill point from crumbling under pressure.
Dated this Fifth day of August 1898.
COMPLETE SPECIFICATION.
Improvements in Tool Holders or Sockets for Drilling Machines.
I, EDWARD SLOPER TOOMER, Gentleman, of Preston House, High Street, Sand-
wich, do hereby declare the nature of my "Invention for Improvements in Tool-
holders or Sockets of Drilling Machines," and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
-
My invention is simply the placing of a plug of hard wood B, at the end of
the revolving bar of a drilling machine so shaped as to hold the tool or drill in
the right position for work. This plug of hard wood is held in position by a
metal sheath or tube A, which fits tightly both the boss of the revolving bar C,
of the machine and the wooden plug.

page_text: The revolving bar of the drilling machines for which this improvement is
intended ends in a round boss which has a side screw tapped into it; a hole is
made in the side of the tube to allow this side screw to pass through it. Also two
other holes are made in the tube at the lower end each tapped with a screw thread
so that one screw on each side can pass through the tube and the wooden plug
to secure the tool or drill that it may not drop out while in use.
These screws need not always be used for securing the drill or tool as the
ordinary stock-bit with a square taper socket can be kept in place by rubbing it
with a little rosin or the wood itself could be made to hold it by compression
on screwing down the drill on to a piece of wood as if in use; but one of the
scrows will always be needed to cause the wooden plug to revolve with the rod.
If the boss of the revolving bar is one inch long then the tube could be about
two inches long and the plug would fill the lower inch while the boss of the
revolving bar filled the upper inch of the tube which thus joins the two together.
These measurements to vary with the size of the machine.
.
How TO BE PERFORMED.
The tube may be made by twisting a piece of square iron rod into a spiral of the
required diameter, that is smaller than the finished tube, and then welding the
whole into a solid pipe. This pipe can then be reduced to the proper size by
the file or in a lathe. The lower half of the tube should be bored slightly taper
so that in case of a wooden plug swelling or shrinking it could be rendered service-
able with no appreciable delay.
The wooden plug is to made as follows;-It is first to be turned slightly taper to
fit the lower end of the tube then a hole is to be cut in the center to fit the shank
of the tool or drill. This hole is to be cut as follows:-The shank of the drill may
be round or square; it may be parallel or taper. In the case of round drills
the hole would be cut by boring either parallel or taper. In the case of a square
taper shank like the ordinary stock-bit, the wood must be lined to shape before
cutting as follows;-Draw a perpendicular line down the side of the wooden plug
and from each of its extremities draw another line across the end of the plug
so as to pass over its center. If this is done truly, a line joining the ends of the
two lines last-named will pass down the side of the plug perpendicularly.
Again; On each end of the plug draw another line also through the center
at right angles to the one first made and join the ends of them by lines down the
sides of the plug. These lines will be useful to shew where to bore the holes for
the screws in the tube above mentioned. Next mark off on each of the lines at
the end of the plug a distance on each side of the centre equal to half the thick-
ness of the square tapered shank at one inch from its end and draw lines at right
angles through these points. That will shew a square equal to the thick part of
the shank. Measure the thickness of the thin end of the shank and mark a
square to fit it in the same way on the other end of the plug.
When this has been done the center of the plug can be bored out and the hole
cut to the corners of the squares with a fine saw and finished to shape with a
square tapered rasp or file.
In making large numbers of plugs the points required could be marked by
driving five needles with blunt points through a piece of hard wood which had
been similarly marked and pressing them down on to the end of the plug. The
center needle point would require to be longer than the other four so that the
marker could be turned into a correct position toward the side line of the plug
before the other four needles were pressed down to mark the corners of the square.
The side line could be made when the wood was in a long rod and the ends marked
after it had been cut into lengths.
Explanation of the letters marked upon the accompanying drawings.
Figure I. Letter A shows the metal tube placed round the revolving bar C, so
as to join it to the wooden plug or holder B. The position of the drill entering
the plug with a taper shank is shown by dotted lines and the screws to hold it

page_text: there are shown threaded their entire length. The screw which enters the
revolving bar is shown threaded only a portion of its length.
Figure II.
A vertical cross section of the wooden plug B, marked B¹.
Figure III. A horizontal cross section of the wooden plug B at the top
marked B
Figure IV. A horizontal cross section of the wooden plug B at the bottom
marked B1
Figure V. A vertical cross section of the metal tube A marked A¹.
Figure VI. A horizontal cross section of the metal tube or sheath A at the top
marked A".
Figure VII. A horizontal cross section of the metal tube A at the bottom
marked A
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The novelty of placing a socket of hard wood in a machine drill to hold the
tool or drill as distinguished from the use of hard wood, sucli as ash or hornbeam
for handles of chisels, bradawls screwdrivers and the like.
Dated this 24th day of March 1899.
EDWARD SLOPER TOOMER.