GB2216826A - Drill bit holder - Google Patents
Drill bit holder Download PDFInfo
- Publication number
- GB2216826A GB2216826A GB8807879A GB8807879A GB2216826A GB 2216826 A GB2216826 A GB 2216826A GB 8807879 A GB8807879 A GB 8807879A GB 8807879 A GB8807879 A GB 8807879A GB 2216826 A GB2216826 A GB 2216826A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drill bit
- retaining device
- locking
- housing member
- housing
- 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.)
- Granted
Links
- 238000005553 drilling Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 150000001768 cations Chemical class 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/16—Cutting tools of which the bits or tips or cutting inserts are of special material with exchangeable cutting bits or cutting inserts, e.g. able to be clamped
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The holder comprises a housing member 10 arrangeable to surround the butt end of the drill bit 15 and a locking member 18 arrangeable to extend from the housing member to engage the drill bit. The locking member 18 is a U-member with two lateral pin arms extending through the socket and engaging a bit shoulder 17 in either bit side. The member 18 snap fits in the holder and is protected by a sleeve 21. <IMAGE>
Description
RETAINING DEVICES
The Invention relates to retaining devices, and particularly to devices for retaining drill bits in drilling apparatus.
In drilling apparatus, and particularly in apparatus for drilling holes into mine roofs or mine faces, the apparatus has a rotatable drive member which has a socket therein to receive the butt end of an elongate drill bit. The socket and butt end are so shaped that once the drill bit is inserted into the drilling apparatus, it will rotate with the drive member.
The socket and butt end may for example have a square or hexagonal cross sect Ion.
In general, the apparatus will be used to drill a hole horizontally, or vertically upwardly, so there is no tendency for the drill bit to fall out of the drilling apparatus. However, in some circumstances, it may be desired to drill downwardly, but until now, complicated and expensive devices have been necessary to clamp the drill bit into the socket.
We have now developed a very simple means of retaining a drill bit in a drilling apparatus.
According to the invent ion, a retaining device for retaining a drill bit in drilling apparatus comprises a housing member arrangeable to surround the butt end of the drill bit and a locking member arrangeable to extend from the housing member to engage the drill bit.
The housing member may comprise the rotatable drive member of the drilling apparatus.
Preferably the retaining device Is for use with a drill bit having a shoulder or other abutment thereon, and the locking member comprises at least one locking pin movable to extend over the abutment and hence lock the drill bit against removal from the housing member.
Preferably two locking pins are provided, to engage one on each side of the drill bit.
Preferably the two locking pins comprise the arms of a U-shaped member.
Preferably holes are provided In the housing member at each side of a socket to receive the drill bit, so that the locking member can be Inserted through one side of the housing member to extend first through that side then across the abutment, and then out through the other side of the housing member.
Preferably the locking member and housing member are shaped so that the locking member can be snap fitted into Its locking position.
By way of example, a specific embodiment of the invention will now be described, with reference to the accompanying drawings, In which :
Figure 1 is a cross-sectlonal view through an embodiment of retaining device according to the invention;
Figure 2 Is a side elevation of this embodiment of the invention, looking in the direction of arrow A of
Figure 1; and
Figure 3 is a plan view of the retaining device.
The figures show a drive member 10 for a drilling apparatus (not shown). The drive member 10 has a portion 11 by means of which the drive member can be rotated about an axis 12 when in position In the drilling apparatus.
Internally the drive member has a hexagonal cross-section socket 13 for the receipt of the butt portion 14 of an elongate drill bit 15. The drill bit is also of hexagonal cross-section so when the drill bit Is fitted into the socket as shown in Figure 1, the drill bit will rotate with the drive member 10.
As described so far, the device is conventional.
However, unlike conventional apparatus, drive member 10 is provided with a housing port ion 16 which, when the drill bit is fitted into position, surrounds, and extends above, an annular shoulder 17 provided on the drill bit.
Insertable through the housing portion 16, through holes at each side of the housing portion, which are not visible in the drawings, is a locking member in the form of a U-shaped spring clip 18. As can best be seen from Figure 3, the U-shaped clip 18 has two arms 19 and 20 which extend one on each side of the drill bit.
Each arm is curved inwardly slightly, as can be seen from
Figure 3, and the housing portion 16 is simIlarly shaped so that the clip can be snapped into the locking position as shown in Figure 3. In this position each arm passes through a first hole in one side of the housing portion 16, then extends across one side of the shoulder 17, and then extends out through a further hole In the other side of the housing portion 16.
When the clip 18 Is snapped into the position shown In Figures 1 and 3, the drill bit 15 is very simply, but very effectively retained in position in the drive member 10, even if the drilling apparatus Is turned downwardly, for example, to drill a hole in the floor of a mine working. When however it is desired to remove the drill bit, the clip 18 can almost instantaneously be pulled clear to release the drill bit.
If desired, a collar 21 may be provided on the drive member 10, having an annular flange 22 which protects the clip 18 and prevents its accidental removal.
The collar 21 may for example be screw-threaded onto the drive member 10.
The contents of all papers and documents filed concurrently with this specification are incorporated herein by reference.
All of the features disclosed In this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined In any combination, except combinations where at least some of such features and/or steps are mutually exclusive.
The invention is not restricted to the details of the foregoing embodiment(s). The invention extends to any novel one, or any novel combination, of the features d I sc I osed In this spec I f I cat ion (I nc I ud I ng any accompanying claims, abstract and drawings) or to any novel one, or any novel combination, of the steps of any method or process so disclosed.
Claims (11)
1. A retaining device for retaining a drill bit in drilling apparatus, the retaining device comprising a housing member arrangeable to surround the butt end of the drill bit and a locking member arrangeable to extend from the housing member to engage the drill bit.
2. A retaining device as claimed in Claim 1, in which the housing member comprises the rotatable drive member of the drilling apparatus.
3. A retaining device as claimed in Claim 1, or
Claim 2, for use with a drill bit having a shoulder or other abutment thereon, the locking member comprising at least one locking pin movable to extend over the abutment and hence lock the drill bit against removal from the housing member.
4. A retaining device as claimed in Claim 3, In which two locking pins are provided, to engage one or each side of the drill bit.
5. A retaining device as claimed in Claim 4, In which the two locking pins comprise the arms of a Ushaped member.
6. A retaining device as claimed in any one of
Claims 3 to 5, in which holes are provided in the housing member at each side of a socket to receive the drill bit, so that the locking member can be inserted through one side of the housing member to extend first through that side, then across the abutment, and then out through the other side of the housing member.
7. A retaining device as claimed In any one of the preceding Claims, in which the locking member and housing member are shaped so that the locking member can be snap fitted Into its locking position.
8. A retaining device as claimed In any one of the preceding Claims, in which a collar is provided around the housing to protect the locking member.
9. A retaining device constructed and arranged substantially as herein described, with reference to the accompanying drawings.
10. A retaining device as claimed in any one of the preceding Claims, having a drill bit fitted therein.
11. A drilling apparatus having a retaining device as claimed in any one of the preceding Claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807879A GB2216826B (en) | 1988-04-05 | 1988-04-05 | Retaining devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8807879A GB2216826B (en) | 1988-04-05 | 1988-04-05 | Retaining devices |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8807879D0 GB8807879D0 (en) | 1988-05-05 |
| GB2216826A true GB2216826A (en) | 1989-10-18 |
| GB2216826B GB2216826B (en) | 1992-03-04 |
Family
ID=10634549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8807879A Expired - Fee Related GB2216826B (en) | 1988-04-05 | 1988-04-05 | Retaining devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2216826B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB568225A (en) * | 1943-10-01 | 1945-03-23 | Alfred William Beavon | Improvements in taper plug and socket joints |
| US3534640A (en) * | 1968-05-16 | 1970-10-20 | Gen Electro Mech Corp | Tool coupling device |
| GB1242052A (en) * | 1967-05-25 | 1971-08-11 | Wickman Wimet Ltd | Percussive rock drilling apparatus |
| GB1275443A (en) * | 1968-11-29 | 1972-05-24 | Halifax Tool Co Ltd | Improvements in or relating to percussion drills |
| GB1342470A (en) * | 1969-12-22 | 1974-01-03 | Staveley Ind Ltd | Machine-tool spindles or chucks |
| GB2141659A (en) * | 1983-06-20 | 1985-01-03 | Vnii Pk I Mechanizirovannogo | Tool retainer for a percussive tool |
| US4702328A (en) * | 1985-11-22 | 1987-10-27 | Mcsweeney Lawrence H | Roof drilling system |
-
1988
- 1988-04-05 GB GB8807879A patent/GB2216826B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB568225A (en) * | 1943-10-01 | 1945-03-23 | Alfred William Beavon | Improvements in taper plug and socket joints |
| GB1242052A (en) * | 1967-05-25 | 1971-08-11 | Wickman Wimet Ltd | Percussive rock drilling apparatus |
| US3534640A (en) * | 1968-05-16 | 1970-10-20 | Gen Electro Mech Corp | Tool coupling device |
| GB1275443A (en) * | 1968-11-29 | 1972-05-24 | Halifax Tool Co Ltd | Improvements in or relating to percussion drills |
| GB1342470A (en) * | 1969-12-22 | 1974-01-03 | Staveley Ind Ltd | Machine-tool spindles or chucks |
| GB2141659A (en) * | 1983-06-20 | 1985-01-03 | Vnii Pk I Mechanizirovannogo | Tool retainer for a percussive tool |
| US4702328A (en) * | 1985-11-22 | 1987-10-27 | Mcsweeney Lawrence H | Roof drilling system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2216826B (en) | 1992-03-04 |
| GB8807879D0 (en) | 1988-05-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940405 |