U.S. patent application number 10/539148 was filed with the patent office on 2006-04-13 for coupling sleeve for connection of a threaded rock bolt to an impact rock drilling machine.
Invention is credited to Morgan Kanflod, Fredrik Oberg, Bertil Stenberg.
Application Number | 20060078372 10/539148 |
Document ID | / |
Family ID | 20290236 |
Filed Date | 2006-04-13 |
United States Patent
Application |
20060078372 |
Kind Code |
A1 |
Kanflod; Morgan ; et
al. |
April 13, 2006 |
Coupling sleeve for connection of a threaded rock bolt to an impact
rock drilling machine
Abstract
Coupling sleeve for connecting a threaded rock bolt (1) to an
impact rock drilling machine (2) comprising a first part (3)
provided with an internal thread (4) for connection of the rock
bolt (1) and a second part (5) provided with an internal thread (6)
for connection of the rock drilling machine (2), whereby the second
part (5) comprises a transversely to a longitudinal axis (9) on the
coupling sleeve arranged locking device (7) which cooperates with a
region (8) on the rock drilling machine (2) for preventing that the
coupling sleeve and the rock drilling machine (2) are
separated.
Inventors: |
Kanflod; Morgan; (Orebro,
SE) ; Oberg; Fredrik; (Orebro, SE) ; Stenberg;
Bertil; (Orebro, SE) |
Correspondence
Address: |
Mark P. Stone
25 Third Street
4th Floor
Stamford
CT
06905
US
|
Family ID: |
20290236 |
Appl. No.: |
10/539148 |
Filed: |
January 26, 2004 |
PCT Filed: |
January 26, 2004 |
PCT NO: |
PCT/SE04/00085 |
371 Date: |
June 16, 2005 |
Current U.S.
Class: |
403/286 |
Current CPC
Class: |
E21B 17/0426 20130101;
E21B 17/03 20130101; Y10T 403/50 20150115; E21B 17/043
20130101 |
Class at
Publication: |
403/286 |
International
Class: |
E21B 17/043 20060101
E21B017/043 |
Foreign Application Data
Date |
Code |
Application Number |
Jan 30, 2003 |
SE |
0300211-0 |
Claims
1. Coupling sleeve for connecting a threaded rock bolt (1) to an
impact rock drilling machine (2), said coupling sleeve comprising a
first part (3) provided with an internal thread (4) for connection
of the rock bolt (1), and a second part (5) provided with an
internal thread (6) for connection of the rock drilling machine
(2), characterized in that the second part (5) comprises a locking
device (7) arranged substantially transversely to a longitudinal
axis (9) of the coupling sleeve, said locking device cooperating
with a region (8) on the rock drilling machine (2) for preventing
separation of the coupling sleeve and the rock drilling machine
(2).
Description
[0001] The present invention relates to a coupling sleeve for
connection of a threaded rock bolt to an impact rock drilling
machine more specifically the invention is about a specific design
of the coupling sleeve which secures that a certain of the two
threaded connections of the coupling sleeve is loosened first when
the rock drilling machine is disconnected from the rock bolt.
[0002] In a previously known solution for securing that a certain
thread connection is loosened first, see SE 433 097, one uses
threads with different pitches, different threads or cones in order
to achieve a thread connection which is substantially more
difficult to loosen than the other. These solutions have the
drawback that one must use nonstandard parts. All the time one also
must check which end is which in order to achieve correct
connection.
[0003] In an attempt to solve the above mentioned problem, see WO
02/057591, a sleeve is clamped on the thread which is to be
difficult to loosen. It has turned out that this solution has the
drawback that it cannot take the shock wave loads to which the
thread connection is exerted during drilling.
[0004] The present invention, which is defined in the subsequent
claim, aims at doing away with the above mentioned drawbacks by
providing the coupling sleeve with a locking device which
cooperates with a region in the shank adapter of the rock drilling
machine in order to prevent that the coupling sleeve and the rock
drilling machine are separated when the rock drilling machine and
the rock bolt are separated.
[0005] An embodiment of the invention is described below with
reference to the accompanying drawing in which FIG. 1 shows a
perspective view of a coupling sleeve according to the invention
and a shank adapter and a rock bolt for cooperation with the
coupling sleeve. FIG. 2 shows a section through the device
according to FIG. 1 with rock bolt and rock drilling machine
connected to the coupling sleeve.
[0006] The coupling sleeve shown in the drawing comprises a first
part 3 provided with an internal thread 4 to which a threaded rock
bolt 1 is connectable. The threaded rock bolt is provided with a
not shown drill bit for drilling of the hole in which the rock bolt
is to be anchored. The coupling sleeve comprises also a second part
5 provided with an internal thread 6 to which a rock drilling
machine 2 is connectable. In the drawing the shank adapter
belonging to the rock drilling machine is shown. The coupling
sleeve has a longitudinal axis 9. The coupling sleeve is in its
second part 5 provided with two transversely to axis 9 arranged
borings 10 in which a locking device 7 in form of two spring pins
is arranged. The locking device 7 cooperates with a region 8 in
order to prevent that the coupling sleeve and the rock drilling
machine 2 are separated.
[0007] When setting a rock bolt 1 the shank adapter belonging to
the rock drilling machine 2 is rotated at the same time as it is
exerted to impacts. Through this a hole is drilled with rock bolt 1
in which hole the rock bolt is to be anchorerd. During drilling the
locking device 7 is unloaded. After drilling the rock bolt 1 is to
be separated from the coupling sleeve and left in the rock. Hereby
the rock drilling machine is rotated for loosening of the thread
connection. Through cooperation between the locking device 7 and
region 8 which has a smaller diameter than the thread of the shank
adapter it is prevented that the rock drilling machine 2 and the
coupling sleeve are separated. After that the drillhole is filled
around the rock bolt with cement or resin for anchoring of the rock
bolt in the borehole.
* * * * *