Improvements in Slide Rests and the like Tool Holders.
Year: 1896

page_text: Date of Application, 17th Dec., 1896-Accepted, 23rd Jan., 1897
COMPLETE SPECIFICATION.
Improvements in Slide Rests and the like Tool Holders.
I, LOUIS COLAS, of 14 Avenue du Midi, Brussels, in the Kingdom of
Belgium, 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 :-
This invention relates to a slide rest or tool holder possessing numerous
advantages lacked by those at present in use and ensuring .considerable solidity
and compactness while at the same time its construction is very simple.
I am aware that swivelling tool holders have already been constructed, such
devices however, do not allow the tool to be moved in all directions. According to
my invention this serious defect is remedied by the combination of two ball and
socket joints.
In order that my invention may be clearly understood I will describe the same
with reference to the accompanying drawing which represents this double jointed
tool holder.
"
The device consists of three principal parts C, T and R as shown in Figure 1;
(sectional elevation).
The part C constitutes the table of the carriage.or slide; this table is concave
at its top, and in the concave recess the convex part T is. located so as to form a
ball joint with the table C:
The part T is at its upper side provided with a spherical recess in which the
convex part R is located. so as to form together with the part T another ball
joint. All these parts CR and T, are freely connected hy. a pin or stud G. which
forms a central pivot for the whole arrangement. It will he evident that when the
tool is to be set, the nut carried by this pin or stud is only tightened to such an
extent as is necessary for holding the said parts in position relatively to each other,
while leaving them sufficient play, for their free movement.
When the tool is set in position applied ready for work, the nut is tightened and
the whole, thus rigidly fixed forms but a single block.
The piece or block T constitutes the part which holds the tool, the latter being
fixed thereto by any suitable means, but so as to form a rigid body therewith.
In the drawings I have shown the tool L held in position by means of set
screws V.
The piece or bleck T is provided with an internal conical recess E which
allows the said block to oscillate, pivot, turn or yield obliquely in all directions.
It is evident from the preceding description that a tool holder so constructed,
permits of placing or setting and applying the tool in any angular position most
suitable for the cutting operation.
In the accompanying drawings I have, apart from the transverse section,
Figure 1. given a similar section in Figure 2, illustrating by means of dotted lines
a few of the positions which may be assigned to the tool.
Figure 3 is a perspective view of the tool-bolder showing it in the working
position.
Figure 4 shows the block T formed by two parts A and B, each of which is
provided with V shaped recesses, so that when the two parts are united, the
recesses form a cavity, in which the tool is located. This is a constructional
modification.

page_text: The respective order of the concavities and convexities of the several constituent
parts of the device may of course be varied, thus for instance, instead of providing
the table with a concave recess, it may be made convex; and in this case the block
instead of being convex, as shown in Figures 1,2, 3, and 4, would be made concave
as shown in Figure 5.
The advantages possessed by this improved tool holder are due to the fact
that the holder is caused to rotate around a small sphere, thereby allowing it
to assume any inclination required for the cut, as well as the up and down
movements and the instantaneous setting in the position required. The device
moreover dispenses with the use of wedges and consequently obviates any seizing
or abrasion.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A tool holder for use with the carriages or slide rests of machine tools,
the constituent parts of the said tool holder being, made concave and convex
relatively to each other so as to turn for the purpose of allowing not only a
vertical movement of the tool, but also horizontal inclined or any other movement,
substantially as hereinbefore described with reference to the accompanying
drawings.
2. In a tool holder and in combination with such tool holder, a table having
either a concave or a convex surface, and serving to hold or carry a block made
in one or several pieces, the said block being provided with either a convex or a
concave surface, as the case may be, which serves to form a ball joint in co-opera-
tion with the table or slide, substantially as hereinbefore described with reference
to the accompanying drawings.
3. In a tool holder and with the tool-holding block, the combination of a
piece or member forming a ball joint at the upper part of the tool holding
block and forming together with the lower arrangement of the tool holder
the whole device substantially as hereinbefore described with reference to the
accompanying drawing.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.