Improvements in паспцев пог
Year: 1898

page_text: Improvements in паспцев пог DOVETA
We, ROBERT CARLYLE, Junior, of 4, Brewery Street, Ardwick, Manchester, Builder,
and RICHARD DONALD SHANNON, of. 52, Thomson Street, Ardwick, Manchester,
Foreman, do hereby declare the nature of this invention to be as follows:-
The improvements relate to machines for cutting dovetails in the edges of wood or
other material, and have for object to enable the operation of dovetailing. to be
accomplished in a more simple and effective manner, and by automatic means.
In dovetailing machines, as hitherto for the most part employed, the blocks of
material to be subsequently dovetailed together are secured in position upon the
machine in such manner that, at one operation of the cutting tool, a recess may be
cut in one block and the space between two teeth formed in the other.
The blocks are placed together at right angles to each other, and one is clamped to
the table of the machine, but overlaps the same to meet the other, in order that the
necessary cutting may be effected clear of the table; the second block being clamped
to the first after being vertically adjusted so that the lower edges of both inay
coincide, an operation requiring considerable care and entailing much trouble as well
as being unsatisfactory in result.
:
The traverse of the table, and the forward movement thereof are effected by
levers or other hand mechanism, to bring the material tooth by tooth to the cutting
tool.
To obviate the above described drawbacks and to carry out our improvements we
form the operating table of the machine with the whole or a portion of the length of
the cutting side thereof slotted, or toothed, so that the cutting tool may be capable
of freely working within each of the slots in turn, as the table advances.
.:
By this means, it is not necessary for the wood or other blocks to overlap the table,
as the cutting tool operates within the area of the same, and, consequently, the
vertical adjustment already referred to is at once effected by both blocks or boards
being clamped in the required position to the flat surface of the table itself.
We mount upon the bed plate or other part of the machine a horizontal shaft,
suitably driven from any source of power, and connected to a second shaft; by
preference vertical, and so as to be capable of driving the latter in reverse directions
at the will of the operator in any well known manner.
'
The second shaft has keyed or otherwise attached to it a cam or wiper which, at
every revolution of the shaft, forces the operating table, along with its clamps and
connections, towards and away froin the cutting tool, alternately, in order that the
desired cutting may be fully accomplished.
Upon the cain shaft is also attached a pinion, cr crank arm, which, once in every
revolution, comes in contact with a rack in connection with the table, and so moves
the latter to the extent of one tooth in a direction at right angles to the forward
3:

page_text: movement herein before described, whereby, on the next approach of the table to the
cutting tool, the blocks or boards of wood have been moved laterally the requisite
distance for a fresh cut to take place: by which means a succession of dovetail slots
may be cut in both blocks, automatically.
The main shaft may be supported on suitable bearings external to or in connection
with the machine, and the reversing may be effected by sliding such shaft along a key
to bring different gear wheels in action, or in any other convenient manner, and
variations may be made in the dimensions, material and form of the different parts of
the machine, without departing from the peculiar character of the invention.
T
·
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester, Agent for Applicant.
$
Improvements in machines for Dovetailing.
We, ROBERT CARLYLE, Junior, of 4, Brewery Street, Ardwick, Manchester,
Builder, and RICHARD DONALD SHANNON, of 52, Thomson Street, Ardwick, Manchester,
Foreman, 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:-
F
The improvements relate to machines for cutting dovetails in the edges of wood
or other material, and have for object to enable the operation of dovetailing to be
accomplished in a more simple and effective manner, and by automatic means.
In dovetailing machines, as hitherto for the most part employed, the blocks of
material to be subsequently dovetailed together are secured in position upon the
machine in such manner that, at one operation of the cutting tool, a recess may be
cut in one block and the space between two teeth formed in the other.
The blocks are placed together at right angles to each other, and one is clamped to
the table of the machine, but overlaps the same to meet the other, in order that the
necessary cutting may be effected clear of the table; the second block being clamped
to the first after being vertically adjusted so that the lower edges of both may
coincide, an operation requiring considerable care and entailing much trouble as well
as being unsatisfactory in result.
The traverse of the table, and the forward movement thereof are effected by
levers or other hand mechanism, to bring the material tooth by tooth to the cutting
tool.
To obviate the above described drawbacks and to carry out our improvements, we
form the operating table of the machine with the whole or a portion of the length
of the cutting side thereof slotted, or toothed, so that the cutting tocl may be capable
of freely working within each of the slots in turn, as the table advances."
By this means, it is not necessary for the wood or other blocks to overlap the
table, as the cutting tool operates within the area of the same, and, consequently,
the vertical adjustment already referred to is at once effected by both blocks or
boards being clamped in the required position to the flat surface of the table
itself.
We mount upon the bed plate or other part of the machine a horizontal shaft,
suitably driven from any source of power, and connected to a second shaft, by
preference vertical, and so as to be capable of driving the latter in reverse directions
at the will of the operator in any well known manner.

page_text: desired cutting may be fully accomplished.
Upon the cam shaft is also attached a pinion, or crank arm, which, once in every
revolution, comes in contact with a rack in connection with the table, and so moves
the latter to the extent of one tooth in a direction at right angles to the forward
movement herein before described, whereby, on the next approach of the table to the
cutting tool, the blocks or boards of wood have been moved laterally the requisite
distance for a fresh cut to take place by which means a succession of dovetail slots
may be cut in both blocks, automatically.
But that the improvements may be better understood we will, with the aid
of the accompanying drawings, proceed more fully to describe means employed
by us.
DESCRIPTION OF DRAWINGS.
Fig. 1 represents a plan view of the dovetailing machine with a portion of the
operating table at one extremity of its travel longitudinally; Fig. 2 is a front elevation
thereof; and Fig. 3 is an end view with a portion of the base framing broken away
for the sake of clearness. The whole is clamped or bolted to a bed plate or made to
form part thereof, which bed plate carries the cutting tool and the requisite gear for
driving the same. Fig. 4 is an elevation, enlarged, of the tool or cutter used for
cutting the dovetails in the wood or other material to be operated upon. Fig. 5 is
an end elevation, partly in section, of the same end of the machine to that shown in
Fig. 3, but with the cutting tool mounted in position.
The saine letters indicate corresponding parts wherever they occur.
a, a¹, together form the operating table, (the support for which is clamped or
bolted to the bed plate, or otherwise connected thereto) of which a¹, in this case, is
provided with only one slot or gap b, and within which the cutting tool c is to be
capable of freely working as the table advances towards the same.
This cutting
tool may be mounted in position by being attached to and within a sleeve in or
upon the bed plate c¹ and rotated by gearing in connection with a shaft driven by
power; or by other ordinary means.
The blocks or boards c², c³, (which are shown in Fig. 5) to be operated upon are
clamped at right angles to each other by means of the clamps d, d, one board being
firmly held in a horizontal position on table a, a¹, by clamps d, and the second board
being firmly held in a vertical position against the edge of the first by clamps d'.
Part a of the operating table is mounted upon longitudinal slides or guides e,
which in their turn, along with part al of the table, are mounted upon lateral slidės
or guides e¹ and forming part of the framing f.
g is a horizontal shaft which is here shown capable of being rotated by hand,
and is connected to a second shaft g¹ by bevel gearing. This second shaft has
attached to it a cam or eccentric h, the face of which is always in contact with
the parts f2 of the fixed or non-moving frame f.
Upon the shaft g¹ is also attached a wheel; provided with one tooth or projection, and
which projection once in every revolution, comes in contact with a rack attached to
part a of the operating table, and so moves the latter to the extent of one tooth
of the rack in a longitudinal direction. In order to prevent the part a of the table
moving longitudinally when the wood or other material is being operated upon,
we may attach to the shaft g₁ a grooved wheel k, into which groove there projects
the pin of a bolt, such bolt being capable, when required, of entering a hole
in the perforated plate 2 attached to part of the table; but a ratchet and
pawl, or other spacing motion, may be used in lieu of this.
The operation is as follows:-
The cutting tool c having been mounted in or upon the bed plate c¹ and

page_text: in position within or near the gap b of the table, and with the cutting end of
such tool projecting above the level of the table al to the required extent, the
boards of wood c², care clamped at right angles to each other in the manner
described. It will then be seen that by turning the band wheel on shaft g in a
right handed direction, such shaft 3, along with the bevel gearing, shaft g' and
its connections, slides e, and table a, a¹, will be moved laterally towards the
cutting tool, by reason of the shaft g being eccentrically mounted. When the
table has been advanced towards the tool to the requisite extent and the onė
dovetail completely cut, the further turning of the hand wheel will bring the
table back and advance the part a another notch until it arrives at the position
shown, when it will require to be turned in the opposite direction for cutting
purposes, or to bring it again to the starting point. By reason of the shape of the
groove in wheel k, the bolt is allowed to fall out of the hole in plate 2 by gravity,
(and be raised in position in turn,) so that the apparatus can be worked in either
direction longitudinally.
The motion of the hand wheel causes the table to advance to and recede from the
tool c, and as it approaches the further limit of its travel in a lateral direction, the
projection or tooth on wheel; engages with a tooth of the rack ', and by this means
draws forward the part a of the operating table. During this latter process the
parts a, a, of the table have commenced to approach the cutting tool again, but
before reaching the position for the commencement of the cutting of the dovetail,
the tooth on wheel has disengaged with the rack ji, and the bolt k has been forced
into the locking position by the rise of the groove in wheel k. Thus for one direction
of longitudinal travel, the continuous turning of the hand wheel automatically
presents the boards to the cutter in such a way that the dovetails can be cut at
regular intervals along the length thereof, without the necessity of altering the
relative positions of such boards.
As variations, the main shaft may be supported on suitable bearings external to
or in connection with the machine, and shafts g, g, need not necessarily he geared
at right angles, and the reversing may be effected by sliding the main shaft along a
key to bring different gear wheels in action, or in any other convenient manner, and
variations may be made in the dimensions, material, and form of the different
parts of the machine, without departing from the peculiar character of the
invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
1. In hand or power driven dovetailing machines in which the material or boards
of wood are automatically presented to the cutter, the operating, by the continuous
motion of the shaft g, of one part of a table, having the wood or other material
clamped thereto, in the lateral and longitudinal directions, and of a second part of
such table, having a slot or gap therein for the cutter to work within, in the lateral
direction only, for the purpose and in manner substantially as herein shown and
described.
2. In hand or power driven dovetailing machines in which the material or
boards of wood are automatically presented to the cutter, the operating, by the
continuous motion of the shaft g, and in the lateral and longitudinal directions,
of a single table, to which is clamped the wood or other material, and having
slots or gaps along its length for the cutter to work within, for the purpose and in
manner substantially as herein shown and described.
3. In hand or power driven dovetailing machines in which the material or
• boards of wood are automatically presented to the cutter, the operating, by the
continuous motion of the shaft g, and in the lateral and longitudinal directions,
of a single table from which projects the wood or other material clamped thereto,
for the purpose and in manner substantially as herein shown and described.

page_text: 4. In hand or power driven dovetailing machines in which the material or boards
of wood are automatically presented to the cutter, the combination of parts forming
the apparatus, for the purpose and in manner substantially as herein shown and
described.
Dated the 1st day of November 1898
WILLIAM GADD, C.E.,
64, Barton Arcade, Manchester, Agent for Applicant.