Improvements in Tools or Appliances to be used in the Boring or Finishing of Hollow or Tubular Metallic Articles.
Year: 1898

page_text: Date of Application, 15th Feb., 1898-Accepted, 30th Apr., 1898
COMPLETE SPECIFICATION.
Improvements in Tools or Appliances to be used in the Boring or
Finishing of Hollow or Tubular Metallic Articles.
I, ANDREW WILLIAM STOREY, of No. 13, York Road, Erdington, in the County
of Warwick, Mechanical Engineer, do hereby declare the nature of my 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 consists of the construction and arrangements or combinations
of the parts hereinafter described of tools or appliances to be used in the boring
or finishing of hollow or tubular metallic articles such for example as the bottom
brackets, hubs and lugs of velocipedes; and has for its object, in part, to effect
the boring or finishing of the interiors of the said bottom brackets and lugs or
the like and, in part, to effect the holding and self-centring of the articles to
be operated upon.
The boring tool or appliance constituting the first part of my invention has
especial reference to the finishing of articles such for example as bottom brackets
and hubs where the internal diameter of the middle portion is required to be
somewhat larger than the internal diameter at the ends.
Articles of the said description have heretofore been finished by the process of
turning in a lathe but this process is slow and can only be effected by the aid of
skilled labour.
By the use of the boring tool or appliance constituting the principal part of my
invention the said articles may be finished in an ordinary drilling machine the
tool coming into action automatically at the place where the undercut or shoulder
is to be formed by which the smaller upper end part is to pass into the larger
middle part; but the boring tool or appliance may be operated otherwise than
in a drilling machine.
The said tool or appliance may be combined with an ordinary boring tool by
which the ends or smaller parts may be finished simultaneously with the enlarg-
ing of the internal diameter of the middle portion; and, further, there may be
combined with the said tool a face milling cutter or tool by which the upper end
of the article under operation may be faced or finished.
The tool or appliance constituting the second part of my invention has for its
object the firm holding or securing and self-centring of articles to be operated
on in drilling and like machines.
I will describe the under-cutting or internal-diameter enlarging tool constituting
the principal part of my invention in combination with an ordinary boring tool
and face milling cutter and in connection with the finishing of the interior of a
bottom bracket reference being had to the accompanying drawings of which;-
Figure represents partly in elevation and partly in section the combination
tool or appliance referred to;
Figure 2 is a side elevation of the same in conjunction with the "jig" or work
holder constituting the second part of my invention, the boring or finishing tool
heing represented at the end of its work on the bottom bracket in the said "jig"
or holder.
33.
Figure 3 represents a portion of the said Figure 2 partly in side elevation and
nartly in vertical section.
:

page_text: Figure 3 is a cross section on the line x, x Figure 3.
Figures 4 and 5 are plans (the latter partly in horizontal section) of the work
holder or "jig" and a bottom bracket in the same showing the gripping appliance
in and out of action respectively.
The same letters of reference indicate the same parts in the several figures of
the drawings.
I will first describe the construction and action of the combination tool repre-
sented in Figures 1, 2, 3 and 3*.
In a vertical spindle a, which is fixed at top to the boring spindle or bar of an
ordinary drilling automatic or capstan machine, a slot is made the said slot
extending at its lower end cross-wise right through the spindle. In the said slot
I pivot, by means of a screw pin c, a cutter lever d the lower or short arm of
which is made with a cutting edge, or is provided with an adjustable steel cutter d¹
as is represented in Figures 1 and 3. By the length or distance the steel cutter <¹
is made to project from the short arm of the cutter lever d the depth or extent of
the undercutting in the article to be operated on is determined.
The steel cutter d' is adjusted with respect to the cutter lever d as follows.
The cutter lever d is first withdrawn from the slot b in the spindle a, by the with-
drawal of the screw or pivot pin c, when the set or fixing screw d² (see Figure 3)
may be relaxed and the steel cutter d' moved in the hole which it occupies by
the advancing or withdrawing of the adjusting screw pin d³, the steel cutter d¹
being fixed in its re-adjusted position by the tightening of the set screw d² again,
when the cutter lever d is replaced in the slot 6 of the spindle a.
The upper end or arm of the cutter lever d is pressed outwards by a spring_e.
At a convenient distance below the cutter lever d is a ring or collar f the
exterior of which resembles an ordinary boring or milling cutter. The said boring
collar f is fixed to, so as to be incapable of turning on, the spindle a by a cross pin g
in the spindle engaging in depressions at opposite sides of the upper edge of the
collar and the said collar is kept in place by the sleeve h, washer i and screw
nut on the lower screwed end of the spindle a. Above the cutter lever d a face
milling cutter is fixed to the spindle a by the screw pin m.
<
The
The distance apart of the boring collar f and cutter lever d and the distance
apart of the face milling cutter 7 and the said cutter lever are determined by the
size or length of the bottom bracket to be operated upon.
The action of the tool or appliance described is as follows:-
The bottom bracket n having been fixed axially in a tool holder or
ably of the construction hereinafter described, secured to the table or rest of a drill-
jig," prefer-
ing machine, the tool is brought down by the boring bar or spindle of the drilling
machine in the ordinary way. As soon as the boring collar f comes in contact
with the upper end of the bottom bracket the work of the tool commences.
boring collar bores or finishes the interior of the bottom bracket to the size or
internal diameter which the ends of the bottom bracket are to have. When by
the descent of the tool in the bottom bracket n the projecting long arm of the
cutter lever d comes in contact with the edge of the hole in the bottom bracket n
the further descent of the tool causes the pressing inwards of the long arm of the
lever d and the bringing into action of the cutter d' of the said lever at the point
where the undercutting or shoulder is to be formed. The continued descent of
the tool is accompanied by the simultaneous operation of boring or finishing by
the cutter and the enlargement of the internal diameter of the middle portion
of the bottom bracket by the cutter of the lever d.
When the enlargement of the internal diameter of the bottom bracket has pro-
ceeded to the desired length the face milling cutter / comes into action as represen-
ted in Figures 2 and 3 of the drawings.
The work having been completed the withdrawal of the tool is effected by revers-
ing the action of the drilling machine in the ordinary way.
I wish it to be understood that the cutter lever d may be used apart from the
boring collar f and face milling cutter / where the preliminary, boring of the
5

page_text: bottom bracket and facing of the ends are effected separately or in independent
machines.
Further, that the enlarging of the internal diameter of the article operated upon
may be carried to any desired length in the said article. Or the cutter lever d
may be combined with one only of the said tools.
"2
The holder or "jig" represented in Figures 2, 3, 4 and 5 consists essentially
of a base plate p having a hole r which is placed coincident with and axially over
the central hole in the table or rest of the drilling machine, to which table or
rest the holder or jig" is bolted. The said base plate p has an upright p¹ one
part of which is shaped so as to constitute one jaw of the grip for the article
(bottom bracket) to be fixed in the holder (see Figure 5). The other part of the
upright p¹ has a horizontal spindle p² on which the movable jaws of the grip
slides. Where as in the case of the bottom bracket the article to be gripped and
held has a series of lugs or projections the movable jaws has a hole or recess for
taking on one of the said lugs or projections. The movable jaws is moved into
the gripping position Figure 5 by a hand levert pivoted to a vertical pin or stud p³
on the base plate p. The inner or acting end of the said levert has an eccentric
curved surface which bears preferably against a plate u introduced between the
acting end of the lever and the movable jaw s.
66
By the use of the said holder or jig" an article introduced therein may be
readily gripped and securely held with its axis in line with the axis of the drill
spindle and when desired the article may be as readily released and removed and
replaced by a fresh article, the operation of gripping and releasing an article being
effected with a speed unattainable by the use of work holders or "jigs" of the
ordinary construction.
Having now particularly described and ascertained the nature of my inven-
tion and in what manner the same is to be performed I declare that I
claim as my invention:-
First: A tool or appliance for enlarging the internal diameter of hollow or
tubular articles at a short distance from one or both ends, the said tool consisting
essentially of a spindle carrying a lever the short arm of which has a cutting edge,
or carries a separate and adjustable cutter, the long arm of the lever being forced
outwards by a spring the said tool being constructed and acting substantially as
herein before described and illustrated in the accompanying drawings.
Secondly: The combination with the undercutting or internal diameter
enlarging tool claimed in the prior claim of a preliminary boring tool or cutter and
a face milling cutter or one or other of the last named tools, the several parts of
the combination tool being constructed, combined or arranged and acting sub-
stantially as herein before described and illustrated in the accompanying drawings.
Thirdly: A work holder or "jig" for a drilling or like machine consisting
essentially of a base plate with fixed upright one part of which upright constitutes
one of the jaws of the grip the other part of the said upright carrying a horizontal
spindle on which the other or movable jaw of the grip is capable of sliding and the
combination therewith of a lever pivoted to the base plate so as to effect the grip-
ping and release of the article introduced into the holder substantially as herein-
before described and illustrated in Figures 2, 3, 4 and 5 of the accompanying
drawings.
Dated the Fourteenth day of February 1898.
ANDREW WILLIAM STOREY.