Improvements in Machines for Grinding Thread Cutting Tools.
Year: 1893

page_text: Date of Application, 29th Aug., 1893-Accepted, 28th Oct., 1893
COMPLETE SPECIFICATION.
[Communicated from abroad by CHARLES P. R. THIEL, of 5, Exchange Street,
and Max M. AUST, of 11, Bunker Hill Street, both of Lawrence, in the
County of Essex and State of Massachusetts, United States of America,
Weavers.]
Improvements in Machines for Grinding Thread Cutting Tools.
I, HENRY HARRIS LAKE, of the Firm of Haseltine, Lake, & Co., Patent
Agents, 45 Southampton Buildings, in the County of Middlesex 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 machines for grinding tools to be used particularly in
cutting screw-threads to standard, or worms, although it may be arranged to cut
other angles, and it consists in the novel construction and arrangement of parts
hereinafter described, whereby the adjustments are rendered more perfect, and a
greater degree of accuracy and efficiency obtained.
In the accompanying drawings,
Figure 1 is a side elevation of my improved machine.
Figure 2 is a plan view of the same.
Figure 3 is a plan view with the carriage moved into a position to gauge the
work, and
Figure 4 is a view partly in vertical section, and partly in side elevation.
A is a frame or upright supported by a base A', and sustained by this upright is
a shaft a driven by a pulley a¹ and having fixed on it a cupped emery wheel B
which is furnished with a brass flange B₁ for purposes of safety. b, bare ordinary
oil-cups. C is a horizontally sliding saddle-block moving on the slide-bed C
supported by the frame of the machine, said saddle-block sliding on a line which
is beneath and parallel with the face of the emery wheel, and being adapted to be
held in any desired position by set screws C A vertical tube d extends up
through this saddle-block, as shown in Figure 4 and its lower end extends into a
slot or groove e extending longitudinally and centrally in the slide-bed C', a
flange di preventing it from vertical movement. Mounted on the saddle-block
and swivelled on the tube is a substantially circular block or plate D, whose
periphery is provided with notches or recesses spaced off at the angle required to
grind the tool square such as the standard thread .tools require. A nut dis
placed on the upright tube d and set against the upper surface of the swivelled
block D. E is a catch or stop-finger pivotally secured at g to the slide C and
adapted to engage in one of the notches by means of its projection E¹ (Figure 3),
and to be disengaged by its handle E" (Figures 1 and 2).
F is a slide-bed or carriage, integral with the hub F fitted between two lips H
extending up from the swivelled plate or block D, said lips, and hub in connection
with the bolt H', constituting a joint whereby vertical adjustment of the carriage is
had, useful in grinding the front clearance of tools. H" is the adjusting nut actuated
by the handle H. The end wall F" of this carriage or slide-bed is perforated to
receive the plain portion of the horizontal screw h, provided with annular
shoulders and adapted to be rotated by the counterweighted handle ¹¹. This
screw engages a downward projection or nut I' integral with the split bearing I,
which rests and slides on the slide-bed F and sustains adjustably the sliding feed J,
to which is fitted the tool-post fork K, within whose bifurcation is set the tool-post
or holder L provided with the opening L' and set-screw L", by means of which
the tool, as x, for cutting the thread, is held adjustably.

page_text: N is a vertical spindle (Figure 4), fitting within the tube d, and provided with a
V-shaped groove N' comprising an angle of about sixty degrees. This spindle is a
centre-indicator whereby the proper position of the point of the tool is indicated.
The spindle is adapted to be raised and lowered and held in any desired position by
means of the collar n, and screws n' and n", the latter of which is forced into the
V shaped groove.
P is a lever or handle slotted at P" (Figure 3,) and pivotally secured thereby to
the base at its inner end by means of a bolt P¹. This lever engages a bolt / which
extends from the saddle-block C down through the slide-bed C¹, and thus the
saddle-block is moved on said slide-bed, the slot P" allowing the necessary play to
the lever at its fulcrum.
R is an indicator or finger secured to the carriage or slide-bed F and extending
over the graduation scale S on the lip H of the swivelled plate D, whereby the
amount of front clearance of the tool is determined.
The adjustments whereby the tool is ground at the proper angles and places are
as follows by the horizontal movement of the saddle-block C on the slide-bed C¹
by means of the lever P, the line of such movement being under and parallel with
a line drawn horizontally across the face of the emery wheel; by the rotary
movement of the swivelled block in a horizontal plane; by the rotary movement of
the slide-bed F in a vertical plane; by the sliding of the split bearing I and feed J
by means of the screw by the transverse sliding of the tool holder in the forked
tool-post K; and by the adjustment of the tool in the slot in the tool-holder.
7+...
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondents, I declare that what I claim is
1. In a thread tool grinding machine, the combination of the frame having the
grinding tool mounted thereon and set to grind with its face, the slide-bed C¹
secured to the frame, the saddle-block C sliding on said bed on a line beneath and
parallel with a horizontal line drawn across the face of the grinding wheel, the plate
or block D swivelled on the saddle-block and adapted to make a partial rotation
horizontally thereon and provided with peripheral openings for engagement with a
stop-finger secured to the slide C, the carriage or slide-bed F integral with the
hub F¹ and moving in an arc in a vertical plane and supported by said hub which
is adjustably held between the lips H extending from the plate D, said slide-bed
being provided with the perforated outer end wall F, the horizontal screw h
provided with the annular shoulders h¹¹¹, the plain portion of said screw lying in
said end wall, the handle 4 for actuating said screw, the split bearing I provided
with the integral nut or projection 1 sliding on the slide-bed F, and the sliding
feed J supporting the tool-post fork and tool-holder, substantially as set forth.
2. In a thread-tool grinding machine, the combination of the frame having the
grinding wheel mounted thereon and set to grind with its face, the vertical tubular
post d having its lower end secured in the horizontal slot or groove e in the slide-
bed C' and adapted to move in said slot or groove horizontally beneath and parallel
with a line drawn horizontally across the face of the grinding wheel, said tube
constituting a pivot for the block or plate D, the vertical spindle or centre-
indicator N fitting and sliding vertically in said groove and provided with the
V shaped groove N', the collar n on said tube near its upper end and provided with
screws n¹ and n", the former securing the centre-indicator in the desired position in
the tube and the latter extending into the said ✓ shaped groove, substantially as
described.
3. In a thread tool grinding machine, the combination of the frame having the
grinding wheel mounted thereon and set to grind with its face, the inclined sliding
feed J, the substantially horizontally bifurcated tool-post fork K fitted to the
sliding feed, the tool-post or tool-holder L set within the bifurcation in the fork
and provided with the opening L' and set screw L" for adjustably holding the

page_text: tool, the slide-bed or carriage F having a swinging connection with the swivelled
plate D and sustained by the hub F¹ fitted between the lips H extending up from
the said swivelled plate D, said lips being provided with a graduated scale and said
slide-bed being provided with an indicating finger, the block or plate D swivelled
on the saddle-block C and the slide-bed C, substantially as set forth.
Dated this 29th day of August 1893
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.