Year: 1886

page_text: Date of Application, 15th Mar., 1886.
Complete Left, 15th Dec., 1886.
Complete Accepted, 18th Jan., 1887.
We, ARCHIBALD BAIRD, Steel Manufacturer, and JOHN ALLISON, Commercial
Traveller, both of 67 Robertson Street, in the City of Glasgow, do hereby declare the
nature of this invention to be as follows
-
Our invention, which relates to hand boring machines of the kind employed in
mining operations, consists of improvements in the split screw nuts and containing
casings or boxes provided for the feeding screws of such machines, the main objects of
the improvements being to prevent over-riding of the nut and stripping of the screw
threads which frequently occur owing to one part of the nut being improperly fitted
in relation to the other part, and in some cases to permit of the employment of a
casing of tubular or similar formation in lieu of the usual casing which is adapted to
receive a polygonal nut.
In order that the two portions of the screw nut, which is divided longitudinally as
usual, may be constantly maintained in their proper relative positions to form a
complete nut with a continuous internal screw thread we unite or connect the two
parts of the nut by a hinge or similar joint, the eyes for the joint pin being either cast
on the parts of the nut or the parts being pivotted together by a projecting piece on the
flanged head thereof so that the nut may be opened up when removed from the
containing casing to permit of shifting it upon the feeding screw and be again closed
thereon; or we form upon the face of one part of the nut tongues or feathers which
fit into corresponding grooves in the face of the other part of the nut; or we fit both
parts of the nut within a frame upon the casing said framing being formed with slide
guides wherein by the use of screws the two parts of the nut may be drawn apart in
the guides to free the feeding screw or be pressed together to close upon the screw; or
a jointed form of nut may be employed and be retained in place by means of wings
thereon by which the parts are clamped together and by studs or wings formed on a
frame piece screwed on to the end of the tube casing. Instead of foming a polygonal
end piece in the screw box or casing to receive the ordinary polygonal form of nut we
may form a pocket therein adapted to receive the hinge joint of the nut, the joint piece
then serving to prevent the nut turning in the casing, or in some cases we may use a
simple tube as the casing the nut being retained by forming slits in the end of the
tube to receive projecting wings or feathers formed on the split nut which may be of
cylindrical formation.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Hand Boring Machines.
We, ARCHIBALD BAIRD, Steel Manufacturer, and JOHN ALLISON, Commercial
Traveller, both of 67 Robertson Street, in the City of Glasgow, 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 :-
Our invention which relates to hand boring machines or drills of the kind employed
in mining operations consists of improvements in the split screw nuts and containing
casings or boxes provided for the feeding screws of such machines, the main objects of
the improvements being to prevent overriding of the nut and stripping of the screw
threads which frequently occur owing to one part of the nut being improperly fitted in
relation to the other part, and in some cases to permit of the employment of a casing
of tubular or similar formation in lieu of the usual casing which is adapted to receive
a polygonal nut.
In the accompanying drawings which illustrate our invention, figures 1 and 2 are
longitudinal and cross sections of one form of our improved hand boring machine or
drill. Figures 3 and 4, 5, 6 and 7, and 8 and 9 are views representing modifications
of the same. Figures 10 and 11 are side and end elevations of the ordinary hand
boring apparatus and figures 12, 13, 14 and 15 are views of split nuts adapted for use
with the same.
In order that the two portions of the screw nut, which is divided longitudinally as
usual, may be constantly maintained in their proper relative positions to form a 2
complete nut with a continuous internal screw thread, we unite or connect the two
parts A, A1, of the nut by a hinge or similar joint, the eyes B, for the joint pin 6 being
either cast on the parts of the nut as shown at figures 1 to 7, or the parts A, A', being
pivotted together by a projecting piece B¹, as seen in figures 14 and 15, on the flanged
head a thereof so that the nut may be opened up when removed from the containing 2
casing C, of the drill tube D, to permit of shifting the nut upon the feeding screw E,
and be again closed thereon; or we form upon the face of one part A of the nut tongues
or feathers a¹ of any suitable shape which fit into corresponding grooves in the faces of
the other part A¹, of the nut as seen in figures 12 and 13 or we fit both. parts of the
nut within a frame F, upon the casing C, as shown in figures 9 and 10 said framing 3
being formed with slide guides, wherein by the use of screws f", the two parts A, A,
of the nut may be drawn apart in the guides to free the feeding screw E, or be pressed
together to close upon the screw, or a jointed form of nut may be employed and be
retained in place by means of wings G, by which the parts are clamped together and
by studs or wings formed on a frame piece H, screwed on to the end of the tube 3
casing as shown in figures 5, 6 and 7. Instead of forming a polygonal end piece in
the screw box or casing C, to receive the ordinary polygonal form of nut we may form a
pocket I, therein adapted to receive the hinge joint of the nut as shown by figures 1

page_text: and 2, the joint piece then serving to prevent the nut A, A', turning in the casing C,
or in some cases we may use a simple tube as the casing the nut being retained by
forming slits in the end of the tube to receive projecting wings or feathers b₁ formed
on the split nut which may be of cylindrical formation as shown by figures 3 and 4.
Having now particularly described and ascertained the nature of our said invention,
and in what manner the same is to be performed, we declare that what we claim is
In hand boring apparatus, a split screw nut constructed and secured as under
the several modifications herein described with reference to the annexed drawings.
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.