CA1109056A - Attachment means for securing a rock bolt dolly to drill steel - Google Patents
Attachment means for securing a rock bolt dolly to drill steelInfo
- Publication number
- CA1109056A CA1109056A CA354,114A CA354114A CA1109056A CA 1109056 A CA1109056 A CA 1109056A CA 354114 A CA354114 A CA 354114A CA 1109056 A CA1109056 A CA 1109056A
- Authority
- CA
- Canada
- Prior art keywords
- dolly
- drill steel
- rock bolt
- attachment means
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 41
- 239000010959 steel Substances 0.000 title claims abstract description 41
- 239000011435 rock Substances 0.000 title claims abstract description 20
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims abstract description 7
- 230000000295 complement effect Effects 0.000 claims abstract description 7
- 238000004804 winding Methods 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 208000027418 Wounds and injury Diseases 0.000 abstract description 5
- 230000006378 damage Effects 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0093—Accessories
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
ABSTRACT
The invention relates to a novel attachment means useful in fixedly interconnecting polygonal drill steel to a rock bolt dolly when the drill steel is inserted into complementary socket means provided at one end of the dolly.
Heretofore, accidental disengagement of the drill steel from the dolly was relatively common often resulting in injury to workers and lost operating time. When in their socketed mode, a length of mild steel rod is welded along one of its end portions to the rock bolt dolly and the other end portion is tightly wound about the drill steel so that this winding abuts a collar on the drill steel intermediate the rock bolt dolly and the winding when the drill steel is socketed to the dolly.
The invention relates to a novel attachment means useful in fixedly interconnecting polygonal drill steel to a rock bolt dolly when the drill steel is inserted into complementary socket means provided at one end of the dolly.
Heretofore, accidental disengagement of the drill steel from the dolly was relatively common often resulting in injury to workers and lost operating time. When in their socketed mode, a length of mild steel rod is welded along one of its end portions to the rock bolt dolly and the other end portion is tightly wound about the drill steel so that this winding abuts a collar on the drill steel intermediate the rock bolt dolly and the winding when the drill steel is socketed to the dolly.
Description
9~5~
This invention relates to a novel attachment means used in fixably interconnecting polygonal drill steel to rock bolt dollys which are used in mining to secure rock bolts in place.
Rock bolts are commonly employed in the mining industry and are commonly used as a means to structurally enhance or support the surrounding walls of undergound exca-vations. These bolts, using conventional drills or jack legs as a power source can be tightened in situ employing different lengths of polygonal drill steel which have been attached to the free end thereof, a rock bolt dolly. One end of the dolly is provided with a polygonal socket receptacle which is adapted to slidingly engage the complementary free end of the drill steel. The other, generally enlarged end of the dolly also includes a socket receptacle so dimensioned as to graspingly engage for tightening the nut portion of a rock bolt. Typical rock bolt dollys to which this invention has application are those currently in use by International Nickel Company of Canada Limited in Sudbury and which are manufactured by Fah Ralloy Canada Ltd. of Orillia, Ontario.
Heretofore, no satisfactory coupling arrangement between the inter-engaging ends of the drill steel and rock bolt dolly has been devised. By its very nature, polygonal drill steel is not susceptible to welding so that it and the dolly can be joined together. Further, due to the hardness of the drill steel, attempts to drill through the common inter-engaging ends of the drill steel and dolly for the purpose of pinning the two together has not proved successful.
Because the socket interconnection between the drill i~
steel and dolly is prone to disengage and the dolly itself is relatively heavy, serious accidents have been occasioned. This may result when the dolly separates from the drill steel during the tightening operation and then hits a nearby operator or miner. The dolly has also been known to separate from the drill steel after bolt tightening and remain stuck to or other-wise jammed on the nut end of a rock bolt. Where located overhead, these separated dollys, can over time, dislodge themselves and cause serious injury to a person underneath.
In addition to the hazard problem inherent in the use of rock bolt dollys as described above, a supply of dollys must always be on hand in situations where they become fastened to and left attached on rock bolts. Indeed, the dolly and drill steel mating components can become separated during stacking or rough handling causing needless annoyance and wasted time.
In accordance with my invention, I have developed a novel way in which to fixably interconnect socketed drill steel or drill steel sections to rock bolt dollys which overcomes the serious and significant disadvantages set out above. The end of the polygonal drill steel which sockets into complementary means in one end of the dolly is provided with or so worked as to include a collar which is adjacent the dolly when the two are coupled together. The attachement means is made up of a length of mild steel rod due to its welding ability. As the dolly itself is also capable of being welded, I then weld one end portion of the rod securely to the side of the dolly and cause the remaining unwelded portion to be at least once tightly wrapped or wound about the drill steel on the side of the collar of the drill steel remote from the dolly so that the wound portion of the rod is in at least partial abutting engagement with the collar. This results in a secure and firm connection between the dolly and drill~teel and one which will not separate during use or through rough handling.
In accordance with a preferred embodiment of my invention, the one end portion of the mild steel rod is welded to the side wall of the dolly so that it is in substantial axial alignment with the dolly and drill steel. This affords a adequate surface area exposure of the rod on the dolly for a secure weld yet minimizes the amount of rod required. The remaining portion of the rod not welded to the dolly is then worked by known means so that it becomes wrapped about the drill steel in a curl or pig-tail. It will also be evident without departing from the scope of my invention that the curled portion of the rod may first be wrapped about the drill steel and the other end then welded to the dolly when the complementary ends of the drill steel and dolly are inter-connected. It will also be apparent that even if there is some axial displacement in the socket coupling, the attachment means engaging the collar component of the drill steel constrains the latter from withdrawal of the dolly socket.
In the accompanying drawing, a working embodiment of my attachment means used in fixedly securing a typical rock bolt dolly to a polygonal section of drill steel is shown.
Rock bolt dolly 1 is in the form of an elongate truncated cone and at its enlarged end is provided with socket
This invention relates to a novel attachment means used in fixably interconnecting polygonal drill steel to rock bolt dollys which are used in mining to secure rock bolts in place.
Rock bolts are commonly employed in the mining industry and are commonly used as a means to structurally enhance or support the surrounding walls of undergound exca-vations. These bolts, using conventional drills or jack legs as a power source can be tightened in situ employing different lengths of polygonal drill steel which have been attached to the free end thereof, a rock bolt dolly. One end of the dolly is provided with a polygonal socket receptacle which is adapted to slidingly engage the complementary free end of the drill steel. The other, generally enlarged end of the dolly also includes a socket receptacle so dimensioned as to graspingly engage for tightening the nut portion of a rock bolt. Typical rock bolt dollys to which this invention has application are those currently in use by International Nickel Company of Canada Limited in Sudbury and which are manufactured by Fah Ralloy Canada Ltd. of Orillia, Ontario.
Heretofore, no satisfactory coupling arrangement between the inter-engaging ends of the drill steel and rock bolt dolly has been devised. By its very nature, polygonal drill steel is not susceptible to welding so that it and the dolly can be joined together. Further, due to the hardness of the drill steel, attempts to drill through the common inter-engaging ends of the drill steel and dolly for the purpose of pinning the two together has not proved successful.
Because the socket interconnection between the drill i~
steel and dolly is prone to disengage and the dolly itself is relatively heavy, serious accidents have been occasioned. This may result when the dolly separates from the drill steel during the tightening operation and then hits a nearby operator or miner. The dolly has also been known to separate from the drill steel after bolt tightening and remain stuck to or other-wise jammed on the nut end of a rock bolt. Where located overhead, these separated dollys, can over time, dislodge themselves and cause serious injury to a person underneath.
In addition to the hazard problem inherent in the use of rock bolt dollys as described above, a supply of dollys must always be on hand in situations where they become fastened to and left attached on rock bolts. Indeed, the dolly and drill steel mating components can become separated during stacking or rough handling causing needless annoyance and wasted time.
In accordance with my invention, I have developed a novel way in which to fixably interconnect socketed drill steel or drill steel sections to rock bolt dollys which overcomes the serious and significant disadvantages set out above. The end of the polygonal drill steel which sockets into complementary means in one end of the dolly is provided with or so worked as to include a collar which is adjacent the dolly when the two are coupled together. The attachement means is made up of a length of mild steel rod due to its welding ability. As the dolly itself is also capable of being welded, I then weld one end portion of the rod securely to the side of the dolly and cause the remaining unwelded portion to be at least once tightly wrapped or wound about the drill steel on the side of the collar of the drill steel remote from the dolly so that the wound portion of the rod is in at least partial abutting engagement with the collar. This results in a secure and firm connection between the dolly and drill~teel and one which will not separate during use or through rough handling.
In accordance with a preferred embodiment of my invention, the one end portion of the mild steel rod is welded to the side wall of the dolly so that it is in substantial axial alignment with the dolly and drill steel. This affords a adequate surface area exposure of the rod on the dolly for a secure weld yet minimizes the amount of rod required. The remaining portion of the rod not welded to the dolly is then worked by known means so that it becomes wrapped about the drill steel in a curl or pig-tail. It will also be evident without departing from the scope of my invention that the curled portion of the rod may first be wrapped about the drill steel and the other end then welded to the dolly when the complementary ends of the drill steel and dolly are inter-connected. It will also be apparent that even if there is some axial displacement in the socket coupling, the attachment means engaging the collar component of the drill steel constrains the latter from withdrawal of the dolly socket.
In the accompanying drawing, a working embodiment of my attachment means used in fixedly securing a typical rock bolt dolly to a polygonal section of drill steel is shown.
Rock bolt dolly 1 is in the form of an elongate truncated cone and at its enlarged end is provided with socket
2 which itself is normally dimensioned so as to receive and grasp the complementary or nut end of a rock bolt (not shown).
The other end of dolly 1 similarly includes a socket 3 outlined in chain-line and is adapted to engage, in complementary fashion, the polygonal outer walls 4 of drill steel 5. Drill steel 5 can of course be of any desired length to meet the job requirements. End 6 is intended to be engaged by and ~3SC ~6 driven by a drill or jack leg (not shown). Collar or abuttment 7 is a common characteristic of drill steel but this is not the case with collar 8 adjacent the dolly which is made using well-known techniques.
Without the benefit of attachment means 9 discussed in greater detail below, it is apparent that drill steel 5 can be withdrawn from socket 3 of dolly l. By welding end 10 of attachment means 9 which is made up of mild steel rod at weldment ll and curling or winding the other end of the rod 12 about drill steel 5 so that at least a portion of this winding or pig-tail abuts collar 8 on its side remote from dolly l, it will be evident that withdrawal of the drill steel 5 from dolly l is inhibited and the two can only be separated by the active removal of the attachment means.
The other end of dolly 1 similarly includes a socket 3 outlined in chain-line and is adapted to engage, in complementary fashion, the polygonal outer walls 4 of drill steel 5. Drill steel 5 can of course be of any desired length to meet the job requirements. End 6 is intended to be engaged by and ~3SC ~6 driven by a drill or jack leg (not shown). Collar or abuttment 7 is a common characteristic of drill steel but this is not the case with collar 8 adjacent the dolly which is made using well-known techniques.
Without the benefit of attachment means 9 discussed in greater detail below, it is apparent that drill steel 5 can be withdrawn from socket 3 of dolly l. By welding end 10 of attachment means 9 which is made up of mild steel rod at weldment ll and curling or winding the other end of the rod 12 about drill steel 5 so that at least a portion of this winding or pig-tail abuts collar 8 on its side remote from dolly l, it will be evident that withdrawal of the drill steel 5 from dolly l is inhibited and the two can only be separated by the active removal of the attachment means.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Attachment means for fixedly interconnecting polygonal drill steel which is coupled to the complementary socket end of a rock bolt dolly and wherein said drill steel includes a collar adjacent the dolly when two are coupled together, said attachment means comprising a length of mild steel rod one end portion of which is welded to the side of the dolly and the other end portion is at least once tightly wound about and in at least partial abutting engagement with the side of the collar of the drill steel remote from said dolly.
2. The attachment means as claimed in claim 1 wherein said one end portion which is welded to the side wall of said dolly is in substantial axial alignment with the dolly and the drill steel.
3. The attachment means as claimed in claim 2, wherein said other end portion of said mild steel rod is wrapped about said drill steel in a pig-tail.
4. A process for fixedly interconnecting a socketed polygonal drill steel section to a rock bolt dolly where said section includes a collar disposed adjacent to said dolly by welding one end portion of a length of mild steel rod to said dolly and snugly winding a portion of the remainder of said rod about said section and in at least partial abutting relationship with that side of the collar remote from the dolly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA354,114A CA1109056A (en) | 1980-06-16 | 1980-06-16 | Attachment means for securing a rock bolt dolly to drill steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA354,114A CA1109056A (en) | 1980-06-16 | 1980-06-16 | Attachment means for securing a rock bolt dolly to drill steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1109056A true CA1109056A (en) | 1981-09-15 |
Family
ID=4117194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA354,114A Expired CA1109056A (en) | 1980-06-16 | 1980-06-16 | Attachment means for securing a rock bolt dolly to drill steel |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1109056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011026180A1 (en) * | 2009-09-01 | 2011-03-10 | Fci Holdings Delaware, Inc. | Dolly |
| AU2012101359B4 (en) * | 2009-09-01 | 2012-11-29 | Fci Holdings Delaware, Inc. | Dolly |
-
1980
- 1980-06-16 CA CA354,114A patent/CA1109056A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011026180A1 (en) * | 2009-09-01 | 2011-03-10 | Fci Holdings Delaware, Inc. | Dolly |
| AU2012101359B4 (en) * | 2009-09-01 | 2012-11-29 | Fci Holdings Delaware, Inc. | Dolly |
| AU2012101360B4 (en) * | 2009-09-01 | 2012-11-29 | Fci Holdings Delaware, Inc. | Dolly and Method |
| AU2010291865B2 (en) * | 2009-09-01 | 2015-05-14 | Fci Holdings Delaware, Inc. | Dolly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |