A New or Improved Hand Apparatus for Drilling and Tapping Holes, Facing Up and Recessing Around Holes, and for Facing and Mitering Valve Seats, and the like.
Year: 1895

page_text: Date of Application, 28th May, 1895
Complete Specification Left, 24th Oct., 1895-Accepted, 18th Jan., 1896
PROVISIONAL SPECIFICATION.
A New or Improved Hand Apparatus for Drilling and Tapping
Holes, Facing Up and Recessing Around Holes, and for Facing
and Mitering Valve Seats, and the like.
I, GEORGE BROOKE of 15 London Street, Maindee, Newport, in the County of
Monmouthshire, Marine Engineer, do hereby declare the nature of this invention
to be as follows:-
(1) I use a crosshead, secured to two uprights, so as to be adjustable according
to the nature & size of work to be done.
The feel
(2) I use a mandril suspended from the crosshead by a feed screw.
screw being connected to the mandril with a box nut, (the friction of mandril being
reduced to a minimum by turning on centre point of feed screw).
The cutters I secure by passing them through a slot in mandril. (The cutter
being reversible for either flat or bevel work, thus obviating the necessity of
employing two cutters.)
The cutter end of mandril I hold in true position by means of a disc. The disc
being made to different sizes according to the work required. Where a disc is
not applicable, I use a leg, both being secured in the same manner to end of
mandril.
The mandril I operate with an open jawed spanner. When the valve seats
are refaced in their place the uprights are secured to the valve box by means of
bolts.
A New or Improved Hand Apparatus for Drilling and Tapping
Holes, Facing Up and Recessing Around Holes, and for Facing
and Mitering Valve Seats, and the like.
I GEORGE BROOKE of 15 London Street, Maindee Newport Monmouthshire
Marine 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 :-
(1) I use a crossbead (A) secured by lock-nuts (S) to either side of uprights (B)
so as to be adjustable according to nature and size of work to be done.
(2) I use a mandril (C) suspended from the crossbead (A) by a feed screw (D)
being connected to the mandril (C) with a box-nut (E). (The friction of mandril
being reduced to a minimum by turning on centre point (F) of feed screw.)
(3) The lock-nut (N) holds the feed screw rigid when required.
(4) The cutters (G) I secure by passing them through a slot in mandril (C). (The
cutter being reversible for either flat or bevel work, thus obviating the neccessity of
employing two cutters. I construct my cutters as follows,
A flat piece of steel made to width of slot in mandril, with sufficient clearance in
LP 71

page_text: depth to admit wedges for tightening; one corner being bevelled (as indicated by
letter (P) for mitring. The opposite corner (indicated by letter (R) is straight for
facing.
(5) The cutter end of mandril I hold in true position by means of a disc (H) the
discs being made to different sizes according to the work required.
(6) Where a disc is not applicable I use a leg (J) both being secured in the
same manner to end of mandril. The discs and legs also act as guides to steady
end of mandril. The mandril I operate with an open jawed spanner.
(7) When valve seats are refaced in their places the uprights (B) are secured to
valve box by means of bolts or other mechanical equivalents. In facing or mitring
large valve seats 1 fit a washer (K) over end of mandril, the cutter (G) resting in
slot (M) to prevent the cutter springing.
(8) In drilling and tapping holes I disconnect mandril (B) from box-nut (E) and
screw in the socket (L).
(9) To operate this machine to perform the work required, the machine must be
placed in position, which is done by securing the uprights to valve box or where
required. Place on end of mandril the size of disc or leg required also cutter.
Connect mandril to feed screw with box nut. The mandril is worked by the
open jawed spanner specified being raised or lowered by the feed screw (D).
When changing cutters it is not neccessary to remove the machine from the valve
box, but unscrew the box nut (E) and take mandril out.
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.) The centre point (F) of feed screw (D) working on end of mandril (C)
enclosed in a box nut (E) as specified.
(2.) Lock nut (N) as specified.
(3.) Reversible cutter as specified.
(4.) Disc (H) & leg (J) for setting cutter end of mandril in true position as
specified.
(5.) The washer (K) with slot as specified.
(6.) The attachment (socket) (L) as specified.
(7.) Adjustable croshead (A) and uprights (B) with lock nuts (S) as specified.
(8.) The above combination comprising the machine as indicated in the title.
23rd October 1895
GEORGE BROOKE.