Year: 1896

page_text: Date of Application, 3rd July, 1896
Complete Specification Left, 31st Mar., 1897-Accepted, 8th May. 1897
1, HUGH PERCIVAL HAMILTON, of Stane, Shotts, in the County of Lanark,
Blacksmith, do hereby declare the nature of my invention to be as follows:-
This invention has reference to and comprises improvements in the construction of
boring tools actuated by hand lever and ratchet mechanism, more especially adapted
to that class of boring tools used for boring minerals, rock and the like, whereby
differential motions are communicated to the boring tool and the screwed spindle, so
that the boring tool can be revolved at a different rate from the feeding screw and
thus enable the tool to be used for different classes of work for which at present.
different tools or tools fitted with different screwed spindles are required.
In carrying into practice the improvements of this invention the head or chuck
into which the end of the boring drill is inserted is formed separately from the
screwed spindle which is inserted within one end, and kept in place by a cotter pin
through the head engaging with a groove formed around the spindle. Internally the
head is formed with an annular shoulder on which rests a strong steel or iron disc
to receive the thrust of the screwed spindle. The head is fitted with the ratchet.
wheel keyed or otherwise secured thereon and the hand lever with spring pawl all
much in a usual manner. The screwed spindle, which works in the usual block, is
also fitted with a ratchet wheel keyed or otherwise secured on the plain part of
spindle, beside which ratchet wheel a loose collar is placed, kept in place close to the
ratchet wheel by another collar secured to the spindle by a cotter pin through both.
The loose collar is formed with a radially projecting arm fitted with a spring pawl to
actuate the ratchet wheel, which arm carries on its upper end a quadrant or segmental
shaped plate. This plate is formed at one end with a stop or heel, and has holes
formed in it into which stop pins can be inserted, which may be bolts and thumb
screws. The top of the radial arm is bent over so that the segmental plate lies against
the side of the hand lever actuating the ratchet mechanism of drilling tool. The
action is as follows:-
When it is desired that both drilling tool and feeding screw be revolved at the
same rate, the stop pin would he inserted in the first hole from the stop on end of
segmental plate with the lever held between them. When it is desired to revolve the
drilling tool to a greater extent than the feeding screw the stop pin would be
inserted in a hole at some distance from the end stop. The lever would thus be able
to travel some distance and actuate the drilling tool mechanism before coming into
contact with the end stop on segmental plate which would then be carried along by
the lever and actuate the ratchet mechanism to revolve the feeding screw.
Dated the 2nd July 1896
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.

page_text: Improvements in Boring Tools.
I, HUGH PERCIVAL HAMILTON, of Stane, Shotts, in the County of Lanark,.
Blacksmith, do hereby declare the nature of my invention and in what manner the
is to be performed to be particularly described and ascertained in and by
the following statement in writing, that is to say :-
same
This invention has reference to and comprises improvements in the construction of
boring tools actuated by hand lever.and ratchet mechanism, more especially adapted
to 'that class of boring tools used for boring minerals, rock, and the like, whereby
differential motions are communicated to the boring tool and the screwed spindle, so
that the boring tool can be revolved at a different rate from the feeding screw and
thus enable the tool to be used for different classes of work for which at present
different tools or tools fitted with different screwed spindles are required.
And in order that my invention may be properly understood I have hereunto
appended a sheet of explanatory drawings in which the same reference letters are
used in all the figures where shown, and in which Figure 1 is a side elevation of a
boring tool, the hand lever and feeding screw with its nut shown as broken away
being of ordinary construction, Figure 2 a sectional plan, Figure 3 a sectional view
on the line 1-1 in Figure 1, and Figure 4 an end view showing the screw spindle in
section.
Referring to these drawings:-
In carrying into practice the improvements of my invention the head or chuck A
into which the end of the boring drill is inserted is formed separately from
the screwed spindle B which is inserted within.one end, and kept in place by a cotter
pin or key passed through the head engaging with a groove b' formed around the
spindle B. Internally the head is formed with an annular shoulder A' on
which rests a strong steel or iron disc a to receive the thrust of the screwed spindle B.
The head or chuck A is fitted with the ratchet wheel C keyed or otherwise secured
thereon or as shown it may be cast in one with the head and the hand lever D with
spring pawl D all much in a usual manner. The screwed spindle, which works in
the usual block or nut, not shown in the drawings, is also fitted with a ratchet
wheel E keyed or otherwise secured on the plain part of spindle B, beside which
ratchet wheel a loose collar F is placed, kept in place close to the ratchet wheel E by
another collar F secured to the spindle B by a split pin through both. The loose
collar F is formed with a radially projecting arm F fitted with a spring pawlf to
actuate the ratchet wheel E which arm F carries on its upper end a quadrant
or segmental shaped plate F³. This plate F3 is formed at one end with a stop
or heel F and has holes formed in it into which a stop pin can be inserted which as
shown at G may be in the form of a bolt having a head flat on one side and a thumb
screw to secure it in position. The top of the radial arm F2 is bent over so that the
segmental plate F3 lies against the side of the hand lever D actuating the ratchet
mechanism of drilling tool. The action is as follows:-
When it is desired that both drilling tool and feeding screw be revolved at the
same rate, the stop pin G is inserted in the first hole from the stop F on end of
segmental plate F3 with the lever D held between them. When it is desired to
revolve the drilling tool in the head A to a greater extent than the feeding screw B
the stop pin G is inserted in one of the holes at some distance from the end stop F*
according to the different ratio desired.
The lever is thus enabled to travel some distance and actuate the drilling tool
mechanism before coming into contact with the end stop F on segmental plate F
which is then carried along by the lever D and made to actuate the ratchet mechanism
to revolve the feeding screw.

page_text: 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 :-
First. The general construction or arrangement and combination of the parts of a
drilling tool all substantially as and for the advantages herein described and illustrated
by the accompanying drawings.
Second. In drilling tools the fitting of the chuck or head free to revolve on the
end of the feeding screwed spindle and the use of pawl and ratchet mechanism for
differentially revolving the screwed spindle all substantially as herein described and
illustrated by the accompanying drawings.
Third. In drilling tools the construction and use of the radial arm, the segmental
plate, and pawl and ratchet mechanism, for differentially revolving the feeding screwed
spindle all substantially as herein described and illustrated by the accompanying.
drawings.
W. R. M. THOMSON & Co.,
96 Buchanan Street, Glasgow, Agents.