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Патент USA US2114132

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April'lZ, 1938.
E. MERRILL
2,114,132
HOLE SPOTTER
Filed April 7, 1957
6 J B
2 Sheets-Sheet 1
7
Everett Merrill '
INVENTOR
BY
ATTORNEY
' April 12, 1938.
E. MERRXLL '
2,114,132
HOLE SPOTTER
Filed April '7, 1-937
'
2 Sheets-Sheet 2
Everett Merrill
IN ENTOR
'BY
ATTORNEY
Patented Apr. 12, 1938
2,114,132
UNITED STATES
PATENT OFFICE
2,114,132
HOLE SPOTTER
Everett Merrill, North Arlington, N. J., assignor
to Worthington Pump and Machinery Corpo
ration, New York, N. Y., a corporation of Dela
ware
Application April 7, 1937, Serial No. 135,374
5 Claims.
This invention relates to rock drilling equip
ment and more'particularly to a hole spotter or
centering device for holding and guiding drill
steels during the starting of a drill hole.
5
ure 4.
Figure 7 is a horizontal section through the hole
spotter taken on the line 1-4 and showing a part
In drilling rock with rock drills of the hammer
of the drilling machine frame in top plan.
piston percussive type, it has been the general
'
practice in starting drill holes for the drill run
ner’s helper or helpers to hold the drill steel man
the improved hole spotter forming the present
invention is particularly adapted for attachment
ually to steady it and get the drill hole started.
1 O This is not only expensive in that it requires the
Referring more particularly to the drawings,
to various types of rock drilling machines em
bodying feeding means and guiding frames for ‘10
services of one or more helpers, but due to the
the movement of the rock drill proper, such as
vibration of the drill steel and the force of its
vibration and movement taken together with the
irregularity of the rock surface in which the drill
the machines shown in Patents Numbers 914,737
to Leyner, 709,022 to Leyner, and 1,690,359 to Gil
man. The patents just quoted show rock drilling
machines of certain types to which the hole spot- ‘16
hole is started is hazardous, often resulting in seri
ous injury to the helper.
The present invention comprehends the provi
sion of a hole spotter which is readily attachable
to or detachable from a drilling machine, and
which will hold a drill steel steady and true during
the starting or spotting of a drill hole, thereby
not only resulting in a savings due to ‘the dis
pensing of the helper in such work, but removes
the hazards to the helper.
An object of the present invention is to provide
a hole spotter as speci?ed which is simple in con
struction, may be used in connection with ap
proved types of drilling machines now on the
30 market, one which is inexpensive to manufacture,
and one which may be easily and quickly moved
out of drill steel guiding position after the drill
hole has been started.
With these and other objects in View, as may
appear from the accompanying speci?cation. the
invention consists of various features of construc
tion and combination of parts, which will be ?rst
described in connection with the accompanying
drawings, showing a hole spotter of the preferred
40 form embodying the invention, and the features
forming the invention will be speci?cally pointed
out in the claims.
In the drawings:
Figure 1 is a side elevation of the improved hole
45 spotter showing it attached to a fragment of a
drilling machine.
Figure 2 is a vertical section through the hole
spotter and a part of the drilling machine and
taken on the line 2-2 of Figure 4.
Figure 3 is a detail section through the hole
spotter and a part of the drilling machine frame
taken on the line 3—3 of Figure 2.
Figure 4 is an end elevation of the hole spotter.
55
(Cl. 255—45)
showing the end opposite to that shown in Fig
Figure 5 is a top plan of the hole spotter.
Figure 6 is an end view of the hole spotter
ter is particularly adaptable, but it is to be under
stood that it may be used in connection with
any approved type of drilling machine to which
it is applicable without departing from the spirit
of the present invention.
The improved hole spotter comprises a stand
ard I which has a pair of oppositely disposed drill
steel guiding members 2 and 3 formed integrally
therewith. The drill steel guiding members are
spaced laterally so as to engage upon opposite 52-5
sides of a drill steel, indicated at A, and they are
spaced longitudinally from each other a distance
greater than the diameter of the drill steel A so
that when it is desired to remove the hole spotter
from drill steel guiding position it may be rotated r31)
a quarter turn and moved downwardly off or from
about the drill steel. The inner sides 4 of the
drill steel guiding members 2 and 3 are prefer
ably curved as clearly shown in Figures 4 and 6 of
the drawings to conform to the curvature of the 535
drill steel and to provide a ?rm holding guide for
the drill'steel during the spotting or starting of a
drill hole.
The hole spotter is readily attachable to or
detachable from a drilling machine of any ap_ 40
proved type, only a fragment of which is shown
in certain of ‘the drawings, and the lower end of
the standard ,I is provided with an opening 5 ex
tending therethrough which ?ts over a lug or pin
6 formed upon and extending forwardly from the ‘45
forward end of the section 1 of the frame B of
the rock drilling machine. The section 7 of the
frame B of the rock drilling machine as shown in
the drawings forms the support for the forward
end of the feed screw 8 by means of which the 50
rock drill proper indicated at C is manually fed
to its work. The drawings show a rock drilling
machine in which the rock drill C is fed manually
to its work by means of the feed screw 8 as for
instance the type of drilling machine shown in 55
2,114,132
2
the two Leyner patents above referred to but it
is to be understood that the hole spotter may be
the combination with a rock drilling machine
used with drilling machines embodying pneumatic
feeds such as that shown in the Gilman patent
above cited or any other approved types of drill
ing machines without departing from the spirit
including a frame, of a lug on the forward end
of said frame, a standard, drill steel guiding
members on said standard, said standard pro
vided with an opening for receiving said lug, said
frame provided with spaced recesses therein and
of the present invention.
The standard I has its lower end flattened, and
it has laterally projecting extensions or lugs 9
and 10 formed thereon and which engage in re
cesses l l and I2 respectively cut in the member ‘I
of the frame B below and on opposite sides of
the lug or pin 6. These extensions 9 and I0‘
engaging in the recesses I l and I2 prevent pivotal
15 movement or wobbling of the hole spotter during
lugs on said standard for engagement in said
recesses to prevent pivotal movement of the
standard relative to the frame.
2. In a hole spotter for rock drill machines, the 10
the spotting or starting of a drill hole.
The standard i has a lug Ill formed thereon to
which a handle I5 is connected. The handle [5
is provided to facilitate the connection of and
20 disconnection from a drilling machine of the
hole spotter and also to permit an operator to
grip it and hold the hole spotter steady during
-.30
the starting of a drill hole.
When it is desired to mount the hole spotter
on a drilling machine, the hole spotter is posi
tioned forwardly of the bracket 1 and is moved
so that the drill steel guiding members 2 and 3
are positioned at a substantially quarter turn
from the position shown in Figure 5 of the draw
ings after which the hole spotter is rotated a
quarter turn to move the members 2 and 3 into
the drill steel guiding position as shown in Fig
ures 1, 4, 5, and 6 of the drawings and the hole
spotter is then moved rearwardly towards the
35 rock drill C and upon the lug 6 with the exten
sions 9 and I0 engaging in the recesses I l and I2
at which time the hole spotter is in position for
use.
After the drill hole has been drilled to a suffi
cient distance to remove the need of the hole
spotter, it is moved forwardly off the pin 6, ro
tated a quarter turn to permit the members 2
and 3 to clear the drill steel, and then moved
downwardly and away so as not to interfere with
45 the continued drilling operation of the drilling
machine.
The vibration of the drilling machine during
operation may cause the hole spotter or drill steel
guide to move off the lug 6, and to prevent such
50
action a locking spring or member 20 is pro
vided which is attached to the standard I in any
suitable manner as at 2| and extends outwardly
from the standard. The outer free end of the
?at locking spring 20 is bent downwardly as
shown at 22 for engagement over and against
55
the end of the boss 8’ which supports the end of
the feed screw 8. A releasing thumb piece 23 is
provided on the locking spring for releasing it
from locking engagement with the boss 8' when
60 it is desired to remove the hole spotter from
attachment to the drilling machine.
t will be understood that the invention is not
to be limited to the speci?c construction or ar
rangement of parts shown but that they may be
65 widely modi?ed’ within the invention de?ned by
the claims.
What is claimed is:
1. In a hole spotter for rock drilling machines,
combination with a drilling machine including a
frame having recesses in its forward end, a lug
on the forward end of the frame between said
recesses, a standard, drill steel guiding members
on said standard, said standard provided with 15
an opening for receiving said lug, means on said
standard for engagement in said recesses to pre
vent pivotal movement of the standard relative
to the frame, and means for locking said stand
ard against accidental movement relative to said 20
frame.
3. In a hole spotter for a rock drilling machine,
the combination with a drilling machine includ
ing a frame having recesses in its forward end,
a lug on the forward end of the frame between 25
said recesses, a standard, drill steel guiding mem
bers on said standard, said standard provided
with an opening for receiving said lug, exten
sions formed on said standard for engagement in
said recesses to prevent pivotal movement of said 30
standard relative to the frame, said drill steel
guiding members being formed integrally with
said standard and spaced laterally for engage
ment on opposite sides of a drill steel and spaced
longitudinally from each other a distance in ex» .35
cess of the diameter of a drill steel to permit
them to be moved clear of a drill.
4. In a hole spotter for rock drilling machines,
the combination with a rock drilling machine in
cluding a frame, of a lug on the forward end of
said frame, a standard, drill steel guiding mem—
bers on said standard, said standard provided with
an opening for receiving said lug, means on said
standard for engagement with said frame to pre
vent pivotal movement of the standard relative 45
to the frame, and a spring latch carried by said '
standard for engagement with said frame.’
5. In a hole spotter for a rock drilling machine,
the combination with a drilling machine includ
ing a frame having spaced recesses in its forward 50
end, a lug on the forward end of the frame be
tween said recesses, a standard, drill steel guid
ing members on said standard, said standard pro
vided with an opening for receiving said lug,
extensions formed on said standard for engage 55
ment in said recesses to prevent pivotal move
ment of said standard relative to the frame, said
drill steel guiding members being formed inte
grally with said standard and spaced laterally
for engagement on opposite sides of a drill steel 60
and space-d longitudinally from each other a dis
tance in excess of the diameter of a drill steel
to permit them to be moved clear of a drill, and
a spring latch carried by said standard for en
65
gagement with said frame.
EVERETT MERRILL.
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