Improvements in or relating to Tool-holders for Slotting, Planing, Shaping, and similar Machines.
Year: 1899

page_text: Improvements in or relating to Tool-holders for Slotting, Planing,
Shaping, and similar Machines.
-
I, JOHN HOLDING, of Union Forge, Saville Street, Sheffield, in the County of
York, Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to tool-holders for slotting, planing, shaping, and similar
machines, whereby when the tool or tools are fixed they release themselves on
their return motion, so as to cause less friction or wearing.
According to this invention I construct on an ordinary ram for say for example
a slotting machine a bracket preferably in two parts which is secured to the
ram by Theaded or other bolts. This bracket carries a tool-holder which is
allowed to oscillate on its spindle or trunnions in the usual manner.
When cutting the work laid out on the slotting machine a lever with a wedge
shaped point enters fully into the bottom of the tool-holder and keeps it rigid to
its work, but on finishing the stroke the lever with its wedged point is withdrawn
and the pressure of a spring on either the top or bottom of the holder forces back
the tool out of action so that it is entirely free from the work on its return
stroke.
For shaping or planing machines the action is the reverse.
The movement of the lever with the wedge shaped point is obtained from the
On the return
ram by tappets, arms, connecting rods, springs or the like.
stroke of the ram, a tappet on a connecting rod attached to the lever with the
wedge shaped point is operated by the ram and coming in contact with a fixed
arm slightly releases the lever, a spring attached to an upper lever on the con-
necting rod pulling it out and releasing the tool-holder. Whilst on the down
stroke, the ram acts on another tappet on the connecting rod and forces the lever
with its wedge shape point up behind and under the tool-holder preventing it and
the tool from receding and keeping it perfectly rigid to its work.
The fixed arm or arms may be placed in any suitable position and the tappets
arranged so as to be moved to any position according to the motion or stroke
of the machine.
Any suitable arrangement of gearing may be adopted to move the lever with
ts wedge shaped point.
Doted this 10th dor of June 1899
BOULT & WADE.
Agents for the Applicant.

page_text: improvements in or relating to Tool-holders for Slotting, Planing,
Shaping, and similar Machines.
: )
I, JOHN HOLDING, of Union Forge, Saville Street, Sheffield, in the County of
York, Engineer, 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:-
4. F
This invention relates to tool-holders for slotting, planing, shaping, and similar
machines, whereby when the tool or tools are fixed they release themselves on
their return motion, so as to cause less friction or wearing.
According to this invention I construct on an ordinary ram for say for example
a slotting machine a bracket preferably in two parts which are secured to the
ram by T-headed or other bolts. This bracket carries a tool-holder which is
allowed to oscillate on its spindle or trunnions in the usual manner.
When cutting the work laid out on the slotting machine a lever with a wedge
shaped point enters fully into the bottom of the tool-holder and keeps it rigid to
its work, but on finishing the stroke the lever with its wedged point is withdrawn
and the pressure of a spring on either the top or bottom of the holder forces back
the tool out of action so that it is entirely free from the work on its return
stroke, or the tool holder may be hung on its trunnions or weighted so that gravity
will hold the tool normally free.
For shaping or planing machines the action is the reverse.
The movement of the lever with the wedge shaped point is obtained from the
ram by tappets, arms, connecting rods, springs or the like. On the return
stroke of the ram, a tappet on a connecting rod attached to the lever with the
wedge shaped point is operated by the ram and coming in contact with a fixed
arm releases the lever. Whilst on the down stroke, the ram acts on
another tappet on the connecting rod and forces the lever with its wedge shape
point up behind and under the tool-holder preventing it and the tool from reced-
ing and keeping it perfectly rigid to its work.
The fixed arm or arms may be placed in any suitable position and the tappets
arranged so as to be moved to any position according to the motion or stroke
of the machine.
In the accompanying drawings:-
Figures 1 and 2 are a front and side elevation respectively showing a con-
venient construction of my invention as applied to a slotting machine.
Like letters indicate like parts throughout the drawings.
A is a ram of ordinary construction; on its head A¹, I fasten brackets B and B₁
preferably by T headed bolts B2 the heads of which engage in slots B³. The
brackets B and B are each provided with a suitable hole B forming the bearing
to receive the trunnions or spindles of the tool holder C which is capable of
oscillation therein.
At the back of the tool-holder C, I place a lever D carrying at one end a wedge
shaped construction D' arranged between the tool-holder and the ram head. The
lever D is pivotted at D² to the bracket B, and at the opposite end to that which
carries the wedge is pivotted one end of a connecting rod E. The other end of
the rod E is pivotally connected by a link E¹, to a bracket F fixed on the ram A.
The connecting rod E carries two tappets E³ E³.
Carried in brackets G G on the frame of the machine, so as to be parallel with
and adjacent to the connecting rod E, is a rod H.
The rod H carries a tappet H¹, placed between, and so as to be capable of

page_text: engaging with either of the tappets on the connecting rod E, as the latter rod
reciprocates with the ram, and are set so that the tappet H¹, engages the tappet E³.
just before the completion of the up stroke of the ram, and the tappet E³ just
before the completion of the down stroke of the same.
The tappets are capable of adjustment on their respective rods being preferably
secured thereon as shown by means of set screws, and it is evident that their
relative positions will require to be altered, as the stroke of the ram is varied.
The operation is as follows:-
Just before the completion of the up stroke of the ram the tappet engages
the tappet H and the connecting rod E being prevented from accompanying the
ram in its upward movement, the lever D is vibrated and raises the wedge 1)¹
forcing it between the tool holder and the ram head and swinging the former
so as to bring its tool into operative position. The wedge holds the tool rigid
to its work during the down stroke until the tappet E engages the tappet H'
when the connecting rod E being again arrested the wedge is lowered and releases
the tool holder, which falls back freeing its tool from the work and preventing
the friction which would otherwise take place during the up or idle stroke of
the ram.
In order to ensure the falling back of the tool holder, a spring may be employed
arranged in any convenient fashion. Or the tool-holder may be so supported on
its trunnions that its tool will be normally held in an inoperative position by the
action of gravity. Or a second wedge may be provided inclined and operating
inversely to the first to which it may be connected by a thin strip of metal.
The above construction is adapted to existing machines but if desired the
brackets may be dispensed with and the ram head itself arranged to carry the tool
holder trunnion.
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. In a slotting shaping or similar machine the combination with an oscillat-
ing tool-holder carried on the ram of a lever carrying a wedge, and means, sub-
stantially as described to cause the wedge to oscillate the tool-holder and hold
its tool in operative position during one stroke of the ram and to withdraw and
hold the wedge free from the tool-holder during the reverse stroke.
2. In a slotting shaping or similar machine the combination with a tool-holder
arranged to oscillate on the ram of a lever carrying a wedge, means substantially
as described to cause the wedge to oscillate the tool-holder and place its tool in
operative position during one stroke of the ram and to withdraw and hold the
wedge free from the tool holder during the reverse stroke, and means to hold the
tool-holder so that its tool is inoperative when the wedge is withdrawn.
3. In a slotting shaping or similar machine the combination with the ram of
movable brackets such as B B¹, a tool-holder such as C. capable of oscillation
therein, a wedge ended lever such as D D¹, and tappets such as H1 H2 H3 operated
by the ram to vibrate the lever and bring its wedge into and out of operative
connection with the tool holder, substantially as and for the purpose described.
4. In a slotting shaping or similar machine the combination and arrangement
of parts forming an oscillating device for the tool-holder substantially as described
or illustrated in the accompanying drawings.
Dated this 6th day of March 1900.