Improvements in and connected with Miners' Picks.
Year: 1893

page_text: Date of Application, 17th Mar., 1893
Complete Specification Left, 15th Dec., 1893-Accepted, 20th Jan., 1894
PROVISIONAL SPECIFICATION.
Improvements in and connected with Miners' Picks.
I, ROBERT ELSE MELLOR, of 2 Grove Place, Brampton, Chesterfield, in the
County of Derby, Engine Wright, do hereby declare the nature of this invention
to be as follows:-
The object of this invention is to construct the heads and blades of miners picks
in such a manner that the blade may be securely attached to the head and
longitudinal and lateral movement avoided.
Now according to this invention 1 form grooves or recesses in that portion of the
blade of the pick which passes through the head of any suitable cross section other
than a rectangle and form therein grooves or recesses to receive cross bars or
projections formed on the inside of the slot in the head through which the blade
passes.
The grooves in the blades may be somewhat shallower than the depth of the
projections which are preferably wedge shaped and parallel to the upper side of
the blade slot in the head so that when the key is driven home the blade is held
by the projections and key alone without coming in contact with the top of the
said slot.
The key is provided with a spring catch which engages with a rack or cross bars
in the key-bed and so prevents it from shaking loose.
The shaft socket is contracted in the middle and the shaft so formed that when
it is driven in it exactly fits the outer portion of the socket and the portion of the
shaft in the space between the contraction and the keybed is expanded to fit
the socket by means of wedges which are inserted through openings formed in the
sides of the head thereby dispensing with rivets which are the chief cause of shafts
breaking.
Dated this 16th day of March 1893.
COMPLETE SPECIFICATION.
Improvements in and connected with Miners' Picks.
I, ROBERT ELSE MELLOR, of 2 Grove Place, Brampton, near Chesterfield, in
the County of Derby, Engine Wright, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:―
The object of this invention is to construct the heads and blades of miners picks
in such a manner that the blade may be securely attached to the head and
longitudinal and lateral movement avoided.
Now according to this invention I make the blade of the pick where it passes
through the head of any suitable cross section other than a right angle and I form
therein grooves or recesses to receive cross bars or projections formed on the inside
of the lot in the head through which the blade passes.
The grooves in the blade may be somewhat shallower than the depth of the
projections which are preferably wedge shaped so that when the key is driven home
D27

page_text: the blade is held by the projections and key alone without coming in contact with
the top of the said slot.
The key is provided with a spring catch which engages with a rack or cross bars
in the key bed and so prevents it from shaking loose or the catch may engage with
the edge of the blade slot.
The shaft socket is contracted in the middle and the shaft so formed that when
it is driven in it exactly fits the outer portion of the socket and the portion of the
shaft in the space between the contraction and the key bed is expanded to fit
the socket by means of wedges which are inserted through openings formed in the
side of the head thereby dispensing with rivets which are the principal cause of
bruken shaft-.
And in order that my said invention may be fully understood I will proceed
to explain the same with reference to the accompanying sheet of drawings in
which:-
Figure 1 represents side view of the head of a pick constructed according to this
invention.
Figure 2 section of same.
Figure 3 section of same on line A. B. with shaft removed.
Figure 4 section on C. D.
Figure 5 view of bottom of socket.
Figure 6 is plan of key.
Figure 7 is side view of same.
Figure is end view of same.
Figure 9 is section of blade through groove.
The same letters denote the same parts in all the figures.
"
a is the metal head formed of malleable iron steel or any other suitable material
the blade the key or cutter to secure the blade in the head d is the shaft or
handle is a slot in the head through which the blade passes the upper portion of
the said slot having tapered or wedge shaped crossbars or projections gggg
formed thereon which projections fit into corresponding tapered grooves in the
Blale A.
The grooves in the blade are so formed that the blade does not touch the top of
the slot in the head thus when the key is driven home the blade is held by the key
and cross bars only as shown at Figure 2.
The cross bars and grooves are deeper on one side than on the other as shewn in
the section of the blade at Figure 9 so that when the key is driven in the blade is
held firmly against one side of the slot in the head and all longitudinal and lateral
motion of the blade avoided.
The key or cotter is split lengthwise as shown at Figure 6 and is provided
with a gib head to prevent it from becoming detached from the head when in
work.
The socket which receives the shaft or handled is contracted at and the shaft
shaped to fit the portion a' when driven in.
Longitudinal saw cuts ii are made in the end of the shaft through which pass
wood wedges inserted through holes 77 in the head a. Through each wood
wedge is passed a metal wedge m preferably of wrought iron the thin end of which
is turned over as shewn at Figure 4 the metal wedges m m being inserted in the
thin end of the wooden wedges and clinched over the thick end thereof thus
preventing the wedges & from becoming displaced. The wooden wedges expand
the end of the shaft so as to fill the portion all of the henda and cause it to be
firmly held therein without the aid of rivets which latter give great trouble owing
to the shafts breaking across the rivet holes.
Although I have shewn the wedges inserted through the shaft at right angles to
the blade I do not bind myself to this particular method as the head may be
tapered sideways and a wedge or wedges inserted parallel to the blade of the pick
(as shown by dotted lines Figures 2 and 3) which method of fastening may be
preferred by some persons.

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 1
claim is
1. In a miners pick the metal head a having tapered cross bars or projections 99 99
in the blade slot substantially as described.
2. In a miners pick the blade 6 having tapered grooves therein the said grooves
being preferably deeper on one side than the other all substantially as described
and for the purposes stated.
3. The improved method of attaching the heads of miners picks to the shafts
thereof by cans of wedges inserted through holes in the head substantially as
described.
4. In a miners pick the key chaving a longitudinal slit therein and a gib head c¹
substantially as described and for the purposes stated.
5. In a miners pick the combination of a metal head a having a slot to receive
the blade and a series of cross bars or projections in the top of the said slot with
a blade having tapered grooves therein corresponding to the said cross bars and a
key or cotter to secure the said blade in the head all substantially as hereinbefore
described and shewn by the accompanying drawings.
Dated this 15th day of December 1893.
FREDK. WALKER,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.