Stone working – Splitting – shearing – and punching
Reexamination Certificate
2000-08-10
2003-01-07
Eley, Timothy V. (Department: 3723)
Stone working
Splitting, shearing, and punching
C125S041000
Reexamination Certificate
active
06502569
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a rock splitter of oil hydraulic piston type, and more particularly, a rock splitter of oil hydraulic piston type, in which a piston inserted into a hole perforating through rock rises and falls depending on a supply of oil.
2. Description of Prior Art
In general, a rock splitter of oil hydraulic piston type splits rock through a procedure by which a housing is inserted into a hole perforating through the rock and a piston rises and falls to split the rock when oil is supplied to the housing.
Referring to the drawings, the conventional rock splitter will be described hereinafter.
FIG. 1
is an exploded perspective view of the conventional rock splitter.
FIG. 2
is a sectional view of an assembled state of the conventional rock splitter before operation.
FIG. 3
is a sectional view of an assembled state of the conventional rock splitter after operation.
As shown in the drawings, The rock splitter
100
includes a housing
110
for inserting into a hole perforating through rock.
The housing
110
has an arch-shaped surface at the lower portion thereof for preventing the formation of gaps between the hole formed in the rock and the housing
110
. The housing
110
further has a plurality of cylinder chambers
111
formed in the upper portion of the housing
110
at prescribed intervals, and has first and second paths
114
and
115
formed at one side portion thereof for supplying and discharging oil.
When the first path
114
is supplied with oil, a piston
130
, which will be described hereinafter, is extended, and when the second path
115
is supplied with oil, the piston
130
is retracted.
Each of the cylinder
111
of the housing
110
includes a folding and unfolding means
120
capable of folding and unfolding to prevent excessive oil from being supplied inside the cylinder chamber
111
of the housing
110
, thereby preventing damage to the housing
110
by overload. The folding and unfolding means
120
includes a fixing member
121
coupled with piston
130
, a locking member
123
having a threaded portion
124
formed on the outer surface of the locking member
123
for engaging to a threaded portion
113
formed on the inner surface of the cylinder chamber
11
, and a connecting member
122
for connecting the fixing member
121
to locking member
123
.
The piston
130
is located on the folding and unfolding means
120
which is inserted into the cylinder chamber
111
. The piston
130
includes a stepped portion
132
formed on a lower portion of the outer circumference thereof, a pair of grooves
133
formed on the outer surface of the stepped portion
132
, first and second O-shaped rings
134
and
135
inserted into grooves
133
for preventing the outflow of oil from the cylinder chamber
111
, and a hole
131
formed upper center portion of the piston
130
in which a screw
140
is inserted for connecting the piston
130
to the fixing member
121
of the folding and unfolding means
120
.
In order to seal the hole
131
after screw
140
is inserted therein, a sealing member
150
is mounted on the end of the hole
131
.
In order to prevent separation of the rising piston
130
from the cylinder chamber
111
, a threaded portion
161
of a cylinder chamber
160
is engaged to a threaded connecting portion
112
of the cylinder chamber
111
.
The cylinder chamber
160
includes a sealing member
162
which is inserted into the upper end portion from the lower end portion preventing the inflow of alien substances into the cylinder chamber
111
and a third O-shaped ring
163
inserted within the cylinder cover
160
for preventing the outflow of oil from cylinder chamber
111
.
The piston
130
is formed in an arc shape at the upper end surface to facilitate maximum contact with the rock.
The conventional rock splitter
100
with the above structure is assembled into the configuration depicted in FIG.
2
through the following procedure.
The folding and unfolding means
120
comprised of the fixing member
121
, the connecting member
122
and locking member
123
is inserted into cylinder chamber
111
of housing
110
. The threaded portion
124
of the folding and unfolding means
120
engages the threaded portion
113
formed on the inner surface of cylinder chamber
111
. The screw
140
is inserted into hole
131
of the piston in which the first and second 0-shaped rings
134
and
135
are inserted. The screw
140
is fixed to the fixing member
121
of the folding and unfolding means
120
, so that the piston
130
is connected with the folding and unfolding means
120
. The hole
131
of the piston
130
is sealed by this sealing member
150
. After that the sealing member
162
and the third 0-shaped ring
163
fasten to the cylinder cover
160
. The threaded portion
161
of the cylinder cover
160
connects to the threaded connecting portion
112
of the cylinder chamber
111
, which is located on its inner circumference.
FIG. 2
a sectional view of the assembled state of the conventional rock splitter before operation.
FIG. 3
a sectional view of the assembled state of the conventional rock splitter after extension of the piston
130
from the cylinder chamber
111
.
When oil is supplied through the first path
114
of the housing
110
, the supplied oil flows into cylinder chamber
111
through gaps formed between the members
121
,
122
and
123
of the folding and unfolding member
120
.
The piston
130
inserted into the cylinder chamber
111
extends due to the rising oil pressure and the extending piston
130
discharges the oil supplied inside the cylinder chamber
111
between the piston
130
and the cylinder cover
160
through the second path
115
of the housing
110
.
Meanwhile, the pressure on the rock caused by the extending piston
130
splits the rock. After that, the folding and unfolding means
120
(including the fixing member
121
, the connecting member
122
and the locking member
123
) is expanded by the fixing member
121
connected to the piston
130
as shown in FIG.
3
.
In the expanded state of the folding and unfolding means
120
, as shown in
FIG. 3
, the gaps
125
(See
FIG. 2
) formed between members
121
,
122
and
123
are sealed, so that oil supplied through the first path
114
is no longer supplied to cylinder chamber
111
, thereby limiting the amount of oil supplied inside the cylinder chamber
111
.
After splitting the rock, when oil is supplied to the second path
115
of the housing
110
, the oil flows into the cylinder chamber
111
between the cylinder cover
160
and the piston
130
, and thereby the rock splitter
100
is returned to its original condition. At this time, the expanded folding and unfolding means
120
is folded by retraction of the piston
130
such that the gaps
125
are again formed between the members
121
,
122
and
123
. The oil, which is supplied within the cylinder
111
of the lower end of the piston
130
through the first path
114
, is discharged through the gaps
125
to the first path
114
, so that the rock splitter
100
is returned to its original condition.
However, because the piston
130
of the conventional rock splitter
100
extends inside the cylinder chamber
111
of the housing
110
by virtue of the high pressure of the oil supplied through the first and second paths
114
and
115
, the piston
130
often deviates from its original position inside the cylinder chamber
111
due to the repetitive extension and retraction operation. The deviated piston
130
scratches the inner surface of the cylinder chamber
111
when the piston extends, and thereby the cylinder chamber
111
is damaged and oil leakage occurs through the gap
125
formed between the cylinder
111
and the piston
130
. Therefore, the rock splitter
100
cannot perform its function, at which time the housing
110
must be replaced. Therefore, there are several disadvantages which decrease efficiency of work, while component expenses and maintenance fees increase.
It was explained that the piston
13
Eley Timothy V.
Gisul Nara Co., Ltd.
Grant Alvin J
Schweitzer Cornman Gross & Bondell LLP
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