An Improved Device or Means for Gripping and Releasing the Screws of Miners' Drills and the like.
Year: 1894

page_text: Date of Application, 17th Feb., 1894
Complete Specification Left, 16th Nov., 1894-Accepted, 29th Dec., 1894
PROVISIONAL SPECIFICATION.
An Improved Device or Means for Gripping and Releasing the
Screws of Miners' Drills and the like.
I, JOHN MARRIOTT of Blackwell in the County of Derby, Mechanical
Engineer do hereby declare the nature of this invention to be as follows:-
The objects of my invention is to provide a simpler form of device for gripping
and releasing the screws of miners' drills and the like and in carrying out my said
invention I provide a box of malleable iron or other suitable metal or material.
through which passes the drill screw, inside this box I place a nut in sections, the
said box being sufficiently large internally to allow the nut to open and close as
desired and capable of being fitted to different kinds of drilling machines or
standards; inside the cover of this box I arrange a cam operated by a lever or
handle from the outside the said cam being formed with curved slots to engage
studs fixed or formed on the different sections of the nut so as to open and close it
at will upon turning the lever or handle on the outside and thus release or grip the
screw of the drill or the like.
Dated this 16th day of February 1894.
W. SWINDELL,
Agent for the Applicant.
2
An Improved Device or Means for Gripping and Releasing the
Screws of Miners' Drills and the like.
1, JOHN MARRIOTT of Blackwell in the County of Derby, Mechanical
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 :-
In drilling coal, stone and the like the drills are generally fitted into a socket on
the end of the drill screw or connected therewith in some suitable manner, the drill
screw passes through a nut or the like fixed on or to a "standard" or other firm
support, the said drill screw being operated by a ratchet brace or other suitable
means and when it is wished to change the drill for a longer one it is necessary to
move the "standard" further back or to reverse the motion of the screw until it
is brought back sufficiently far to accommodate the different drills; it is to obviate
this necessity that my invention is designed and in describing the same reference
will be had to the figures and letters indicating the various parts upon the
accompanying sheet of drawings, upon which :-
Figure 1 is a plan on line 'b.' 'b.' of Figure 2 with the cover and handle or lever
removed.
Figure 2 is a section of the same on line 'a.' 'a' of Figure 1 with cover and
handle or lever fixed.
Figure 3 is a section of the same on line 'c.' 'c.' of Figure 1.

page_text: In carrying out my said invention I provide a box A of malleable iron or other
suitable metal or material the said box being provided with any suitable means
such as the arms B or spigot C for fixing to the standard, the latter not being
shewn upon the drawings. This box has a hole bored or otherwise formed in the
ends or sides thereof through which passes the drill screw H, inside the box is a
nut in sections D, D', each section being provided with a stud E, E' adapted to
engage curved slots F, F', in the cam or circular, slotted plate G, the internal
surfaces of the sections of the nut being threaded to engage the threads of the
drill screw H, the circular slotted plate or cam G fits into a corresponding recess
in the cover J of the box A the said cam carrying a spindle or shaft K passing
through the cover J and being provided with any suitable handle or lever L for
operating the same; the apparatus or device being fitted together and the cover J
firmly bolted or screwed down to the box A, is operated as follows when it is desired
to change the drills -The handle or lever L is turned and by means of the
studs E, E, passing along the curved slots F, F1, the sections D, D', of the nut
are opened, the box being made sufficiently large for the purpose, and the drill
screw may then be drawn back to any desired length and a fresh drill affixed
thereto, it is again adjusted forward to any desired position and the handle or
lever L is turned in the opposite direction, the thread of the sections D, D', of the
nut engaging that of the drill screw and the drilling continued without unnecessary
screwing backwards and forwards of the drill screw or altering the position of the
standard.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
In an apparatus for drilling into coal, stone or the like the improved device for
gripping and releasing the drill screw consisting of a box A with spigots C, arms B,
or other suitable means of affixing to the drilling standards or supports, the said
box having a cover J recessed internally to receive a circular slotted plate or
cam G operated by a handle or lever L from the outside, the said slots F, F¹,
engaging studs E, E', on the sections D, D', of a nut, the thread of which is
adapted to engage the thread of the drill screw H substantially as and for the
purposes herein described and illustrated.
Dated this 15th day of November 1894.
W. SWINDELL,
Agent for the Applicant.