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Патент USA US2408534

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Oct. l,‘ 1946.
o. J. -SCHORER
LUBRICATING SYSTEM FOR ROCK DRILLS
Filed July :51, '1945
,/ M/17H
2,408,534
2,408,534
Patented Oct. 1, 1946
f AUNITED STATES PATÈNT'OFFICE
Y
2,408,534
,
LÚBRICATING srs'rEr/r- Fon Rooi; DRILLs
Otto J. Schorer,- Holyoke, Mass., assigner- to
Worthington Pump and Machinery Corpora
tion, Harrison, N. J., a corporation of Dela
Wavre
Application July 31, 1945, Serial N0. 607,941 I
l
A Y
This invention relates Vto percussive tools and
'more particularly to an oiling or lubricating struc'
ture for pressure fluid actuated rock drills.
An--obiect of the present invention is to pro
vide a >lubricating system for rock drills or the
like, which will supply the necessary lubricating
' 2
I4- has communication through an opening I5
with theV oil reservoir 6. ÀOne or more grooves I'l
are c_ut in the perimeter ofthe flange I8 Aforrned
on the rear end of the cylinder vfront head I3‘,‘-and
it' or lthey establish communication passages
through which lubricant may pass from the
chamber I4 into the cylinder I forwardly of the
head I9 of the piston 2.
In operation; pressure air is admitted, `when
the throttle valve 3 is open, into the channel 4,
and passes through the passageways I2 and I@
into the felt-containing chamber I I, and through
the orifice 9, chamber 6, and opening I5 into the
oil to the various working parts of the drill, uti-'
lizing the back pressure of the operating pressure
fluid to distribute oil to certain of the surfaces
requiring lubrication and utilizing the direct ac
tion of the pressure ñuid to lubricate other parts
of the drill, soas to insure proper and suiiicient
lubrication of all wearing parts of the drill.
oil chamber I4. This pressure air forces a small
With these and otherr objects in view as may'
appear from the accompanying specification, the 15 amount of oil in vapor form through the groove or grooves Il into the cylinder where it contacts
invention consists of various features of construc- `
the
surfaces of the reciprocating piston 2. This
tion and combination of parts, which will be
ñow of oil or lubricant takes place during the
first described in connection with the accompany
return or rearward movement of the piston 2,
ing drawing showing a longitudinal section
Some of the oil or lubricant which is distributed
through a rock drill constructed in accordance
to the piston 2 through the groove or grooves I1
with the invention, and the features forming the
passes forwardly along the piston 2 during succes
invention will |be specifically pointed out in the
sive operation, and works its way into the chuck
claims.
structure 20 to provide proper lubrication thereof.
Referring more particularly to the drawing,
When the piston is making its forward stroke,
the rock drill of the hammer piston type may be 25 and as it approaches its cushioning position, as
of any approved form and comprises the cylin
shown in the drawing, it builds up a pressure for
der I in which the piston 2 is reciprocated by
wardly of the piston head I9 in excess of the
means of air or other suitable fluid under pres
pressure through the passages Il) and 4 (owing to
sure.
The pressure fluid enters the rock drill through 30 a pressure drop caused in these passages by the
action of the valve 5) and pressure air together
the throttle valve 3 and passes into the annular
with oil vapor is forced through the opening I5
distributing channel 4 from where it passes '
into the chamber 6 through the orifice 9, felt
through suitable ports and passages under con
chamber II, passages In and I2 into the cham
trol of the control valve 5 into the cylinder I
ber
in which the valve 5 operates, thus lubricat
for reciprocating the piston 2 in the usual man
ing the valve. At this time oil vapor is also car
ner of operation of rock drills and other percus
ried or forced into the cylinder I rearwardly of
sive tools of this type. A lubricant chamber 5
the piston head I9 where the oil vapor lubricates
is formed in the wall of the cylinder I and has
the cylinder walls, the riñe bar 2I and all other
a filling opening in one end which is normally
closed by the plug l. An oriñce plate 8 is located 40 moving parts of the drill in the rearward part
thereof.
in the reservoir 6 a suitable distancev inwardly
It will be understood that the invention is not
from the inner end of the plug 1 and has a re
to .be limited to the specific construction or ar
stricting orifice 9 therein. The space between the
rangement of parts shown, but that these may
orifice plate 8 and the inner end of the plug 1
be
widely modiñed within the invention as de
is filled with felt or other absorbent material.
fined by the claims.
An opening or passageway IQ establishes com
What is claimed is:
munication between the felt-containing chamber
1. In a lubricating device for rock drill the
II, which is the space in the reservoir 6 between
combination of a cylinder, a piston reciprocable
the orifice plate 8 and the plug l, and the pas
sage l2 formed in the cylinder I. The passage I2 50 therein and having a head, a valve chamber in>
the rear end of said cylinder, a iront head for
has communication with the annular distributing
the cylinder, said cylinder provided with ports
channel 4 and with the chamber in which the
and passages for the distribution of pressure air,
control valve 5 operates.
said
cylinder provided with an oil chamber, said
The cylinder front head I3 has an annular oil
chamber I4 formed therein, and this chamber 55 front head having an oil chamber therein, a pas
2,408,534
3
sage in the cylinder establishing communication
between the oil chamber in the cylinder and the
oil chamber in said front head, said front head
having a passageway .cut therein opening from
its contained oil chamber into the cylinder _in
front of the forward end of the piston head, and
said cylinder having a passageway therein estab
lishing communication between the cylinder con
tained oil chamber and one of said cylinder con
tained pressure air passageways.
Y
2. In a lubricating device for rock drills Ythe
combination of a cylinder, a piston recîprocable
therein and having a head, a valve chamber, in
the rear end of said cylinder, a front head'for
the cylinder, said cylinder provided with ports
and passages for the distribution of pressure air,
said cylinder provided with an oil chamber, >said
front head having an oil chamber therein, a pas
sage in the cylinder establishing communication
between the o-il chamber in the cylinder and the
oil chamber in said front head, said front head
having a passageway cut therein opening from its
contained oil chamber into the cylinder in front
of the forward end of the piston head, and said
cylinder having a passageway therein establish
ing communication between the cylinder con
tained oil chamber and one of said cylinder con
tained pressure air passageways, and an oriñce
plate having a restricting orifice therein in said
cylinder contained oil chamber.
4
3. In a lubricating device for rock drills the
combination of a cylinder, a. piston reciprocable
therein and having a head, a valve chamber in
the rear end of said cylinder, a front head for the
cylinder, said cylinder provided with ports and
. passages for the distribution of pressure air, said
cylinder provided with an oil chamber, said front
head having an oil chamber therein, a passage
in the cylinder establishing communication be
tween the oil chamber in the cylinder and the oil
chamber in said front head, said front head hav
ing a passageway cut therein opening from its
contained oil _chamber into the cylinder in front
of the forward end of the piston head, and said
cylinder having a passageway therein establish
ing communication between the cylinder con
tained oil chamber and one of said cylinder con
tained pressure air passageways, and an orifice
plate having a restricting orifice therein in said
cylinder contained oil chamber, said oriñce plate
forming a chamber in one end of the oil chamber,
absorbent material in said chamber formed by
said orifice plate, said passageway which estab
lishes .communication between said cylinder con
tained oil chamber and one of said cylinder con
tained air passageways opening into the chamber
for-med by said orifice plate.
OTTO J. SCHORER.
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