An Improved Grinding Tool.
Year: 1889

page_text: Date of Application, 13th Aug., 1889
Complete Specification Left, 12th May, 1890-Accepted, 14th June, 1890.
TRUYOLUNA DI ULICATIVA.
An Improved Grinding Tool.
I, HENRY JOHN DISTIN, of 819, Tasker Street, Philadelphia, in the United States of
America, Musical Instrument Maker, do hereby declare the nature of this invention
to be as follows:
My invention relates to a tool which is adapted for grinding the interior of tubes,
pipes, flues, etc., the said tool being expansible and possessing other advantages, and
the invention comprises the improvements hereinafter described.
A mandrel is employed which is intended to be connected with a lathe or other
suitable means for giving it a rotary motion. It is divided for a portion of its length
into two separate and detachable segments or sections constituting, when placed
together and in contact, a cylinder, one of the segments being integral with the body
of the mandrel.
The inner face of the other segment is formed with a longitudinal groove, which
is oblique in the direction of the length of the tool, and the inner surface of the
first named segment is parallel with the axis and periphery of the mandrel; the
groove is adapted to receive a key.
Encircling both the segments is a sleeve, which is split or slotted for a portion of
its length and also slotted transversely, thus forming a T-shaped slot; the inner end
of the sleeve, which is left unslotted, forming a collar, which is interiorly screw-threaded.
to engage with the screw-threaded portion of the mandrel.
A jam-nut fitted over the mandrel and engaging with the threaded portion
thereof, abuts against the collar and thereby serves to hold the same in position.
The inner faces of the segments are tongued and grooved respectively, for preventing
lateral displacement of the loose segment from the other segment.
In order to make use of a grinding-tool of this construction, it must be inserted in
the tube or the like to be ground; the key is then forced into the groove, whereby
the loose segment is forced away from the other segment parallel therewith
from end to end, thus uniformly expanding the sleeve and causing it to assume
an oval shape the tube or the like to be ground is held while the tool is revolved by
the lathe or the like, so that the wall of the bore of the tube is uniformly worked by
the tool, the slot of the said sleeve serving to hold emery or other grinding material,
and to supply it to the surface of the tool as the operation progresses.
:
The split sleeve will, of course, in grinding the tube or the like gradually
become loose therein, and in order to expand it to the proper size to continue the
grinding operation the key must be forced further into the groove.
When the split sleeve becomes worn too small, it must be unscrewed and a fresh
sleeve screwed on.
The fixed segment has a pin or stud which fits in a recess in the loose segment thus,
preventing longitudinal displacement of the segments.
Dated the 13th day of August 1889.
G. F. REDFERN & Co.
4, South Street, Finsbury, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
An Improved Grinding Tool.
1, HENRY JOHN DISTIN, of 819, Tasker Street, Philadelphia, in the United States
5 of America, Musical Instrument Maker, 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 :-
My invention relates to a tool which is adapted for grinding the interior of tubos,

page_text: pipes, flues, etc., the said tool being expansible and possessing other advantages, and
the invention comprises the improvements hereafter described.
In the accompanying drawing-
Figure 1 is a perspective view; and
Figure 2 is a longitudinal section of a grinding tool embodying my invention.
Figure 3 is a detached perspective view of a portion of the tool.
Figure 4 is a cross section taken on the line of figure 2.
Similar letters of reference indicate corresponding parts in the several figures.
A is a mandrel which is intended to be connected with a lathe or other suitable
means for giving it a rotary motion. It is divided for a portion of its length into
two separate and detachable segments or sections B and C, constituting, when placed
together and in contact, a cylinder, as seen in figures 1 and 4, the segment B, as will
be seen, being integral with the body of the mandrel.
The inner face of the segment C is formed with a longitudinal groove D, which
is oblique in the direction of the length of the tool, and the inner surface E of the
segment B is parallel with the axis and periphery of the mandrel; the groove D is
adapted to receive a key F.
Encircling the segments B, C, is a sleeve G which is split or slotted for a portion
of its length as shewn at H, and also slotted transversely as shewn at J, thus forming
a T-shaped slot; the inner end of the said sleeve which is left unslotted, forming a
collar K, which is interiorly screw-threaded to engage with the screw-threaded
portion L of the mandrel.
A jam-nut M, fitted over the mandrel and engaging with the threaded portion L
thereof, abuts against the collar K and thereby serves to hold the same in
position.
The inner faces of the segments B and C are tongued and grooved respectively,
as shewn at N, for preventing lateral displacement of the loose segment B from the
segment C.
In order to make use of a grinding-tool of this construction, it must be inserted
in the tube or the like to be ground; the key F is then forced into the groove D,
whereby the segment. B is forced away from the segment C parallel therewith from
end to end, thus uniformly expanding the sleeve G and causing it to assume an
oval shape the tube or the like to be ground is held while the tool is revolved by
the lathe or the like, so that the wall of the bore of the tube is uniformly worked
by the tool the slot H of the said sleeve serving to hold emery or other
grinding material, and to supply it to the surface of the tool as the operation
progresses.
The split sleeve G will, of course, in grinding the tube or the like gradually
become loose therein, and in order to expand it to the proper size to continue
the grinding operation the key F must be forced further into the groove D.
When the split sleeve G becomes worn too small, it must be unscrewed and a fresh
sleeve screwed on.
The segment C has a pin or stud P which fits in a recess in the section B, thus
preventing longitudinal displacement of the sections.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. A mandrel having detached and fixed segments, a split sleeve encircling the
said segments, and a key which is movable between the said segments, whereby the
sleeve can be uniformly expanded, the said parts being combined and operating
substantially as described.
2. In a grinding-tool, substantially as described, the segments B and C, having a
groove D and face E respectively, the said groove receiving the key F, whereby the
encircling sleeve G may be uniformly expanded, as set forth.
3. A mandrel having detached and fixed segments, a key movable between the
segments, and an expansible sleeve encircling the said segments, in combination with

page_text: the jam-nut M, against which the sleeve abuts, the said parts being combined and
operating substantially as described.
4. In a grinding tool, the segments B and C of the mandrel having a tongue and
a groove respectively, as set forth and for the purpose described.
5. In a grinding tool, the sections B and C, provided respectively with a pin and
a recess, substantially as herein before described.
Dated the 12th day of May 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.