CA1158897A - Expansion bolt - Google Patents
Expansion boltInfo
- Publication number
- CA1158897A CA1158897A CA000367138A CA367138A CA1158897A CA 1158897 A CA1158897 A CA 1158897A CA 000367138 A CA000367138 A CA 000367138A CA 367138 A CA367138 A CA 367138A CA 1158897 A CA1158897 A CA 1158897A
- Authority
- CA
- Canada
- Prior art keywords
- shell
- expansion bolt
- plug element
- spacer
- finger elements
- 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
- 125000006850 spacer group Chemical group 0.000 claims abstract description 27
- 230000008878 coupling Effects 0.000 claims abstract description 4
- 238000010168 coupling process Methods 0.000 claims abstract description 4
- 238000005859 coupling reaction Methods 0.000 claims abstract description 4
- 210000000078 claw Anatomy 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B13/00—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose
- F16B13/04—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front
- F16B13/06—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve
- F16B13/063—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander
- F16B13/066—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like
- F16B13/068—Dowels or other devices fastened in walls or the like by inserting them in holes made therein for that purpose with parts gripping in the hole or behind the reverse side of the wall after inserting from the front combined with expanding sleeve by the use of an expander fastened by extracting a separate expander-part, actuated by the screw, nail or the like expanded in two or more places
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dowels (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
This invention provides an expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured to the stud member toward its remote trailing end, an expansible shell on the stud member, a spacer member disposed on the stud member intermediate the shell and the plug element, the spacer member being comprised of a plurality of elongated finger elements which are adapted to transversely flare the shell upon movement of the plug element towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, the deformable means having sufficient strength to ensure the flaring of the shell prior to the transverse flaring of the finger elements of the spacer member. The expansion bolt of this invention is more versatile in that it cna be used in oversize holes in view of the greater degree of expansion provided.
This invention provides an expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured to the stud member toward its remote trailing end, an expansible shell on the stud member, a spacer member disposed on the stud member intermediate the shell and the plug element, the spacer member being comprised of a plurality of elongated finger elements which are adapted to transversely flare the shell upon movement of the plug element towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, the deformable means having sufficient strength to ensure the flaring of the shell prior to the transverse flaring of the finger elements of the spacer member. The expansion bolt of this invention is more versatile in that it cna be used in oversize holes in view of the greater degree of expansion provided.
Description
l 1588~
This invention relates to an expansion bolt.
Conventional rock bolts of the expanding type include a threaded stud member having a complementary threaded conical plug element towards its one end, and an expansible shell formed of two or more leaves on the stud the shell being adapted to be expanded by the plug in use upon rotation of the stud. A problem associated with such bolts is that the degree of expansion of the shell is limited and the bolts cannot be used in oversize holes.
10An object of the present invention is the provision of a novel expansion bolt which it is believed will be more versatile, from an expansion point of view than conventional -bolts.
According to one embodiment of the invention, there is provided an-expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured~to the stud member toward its remote trailing end, an expansible shell on the stud member, a spacer member disposed on the stud member intermediate the shell and the plug element. ~he spacer member being comprised of a plurality of elongated finger elements which are adapted to transversely flare the shell upon movement of the plug element towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, the deformable means having sufficient strength to ensure the flaring of said shell prior to the transverse flaring of said finger elements of said spacer member.
Preferably the expansible shell will comprise two or more longitudinal lcaf elements, with the spacer being .~
- ,, , , ~,, ,; , ~ 1588~7 adapted to engage the inner surfaces of at least some of the leaves of the shell to flare such leaves transversely.
Preferably the spacer will comprise two or more longitudinal finger elements capable of being flared transversely by means of the plug. In a preferred arrangement the spacer will thus take the form of a second expansible shell arranged in tandem with the first shell. It is also within the scope of the invention to provide more than two expansible shells disposed in tandem, if desirable.
In a preferred arrangement the remote ends of the fingers of the spacer will be deformably coupled together by means of a uniting claw forming the remote extremity of the bolt. Alternatively, the fingers could be releasably bound to the stud by means of an encircling spring clip or the like. The leaves of the shell could be likewise bound together. Preferably the means for coupling the fingers of the spacer together will be sufficient strength to ensure that the leaves of the shell open transversely in use prior to the fingers of the spacer.
It is further preferred that the surfaces of the leaves of the shell and the fingers of the spacer, which mate in use, are substantially parallel. It is likewise preferred that the mating surfaces of the fingers and tapered plug be parallel.
In order to illustrate the invention, an example thereof is described hereunder with reference to the accompanying drawing which is a sectioned elevation of an expansion bolt.
Referring to the drawing, an expansion bolt comprises a shaft or stud 10 which is threaded at its remote trailing end lO(a), and in use provides an anchorage at its leading end lO(b). A tapered plug 11 which has a complementary threaded .
' ' ' .
axial bore is screwed onto the threaded portion lO(a) of the stud 10. An expansible shell 12, which preferably comprises three longitudinal segments or leaves is also disposed on the threaded portion lO(a). In use, the shell 12 is prevented from moving towards the leading end of the stud 10 by means of a collar 13, A spacer 14 is disposed co-axially on the stud 10 intermediate the plug 11 and the shell 12. As shown in the drawing, the spacer 14 engages the inner faces of the shell 12 and is adapted to flare it transversely in use.
Preferably the spacer 14 will also comprise three finger or leaf elements which are in turn adapted to be flared transversely by means of the plug 11. In the arrangement illustrated, spacer 14 is thus in the nature of a second expansible shell arranged in tandem with the first shell 12. In circumstances it is envisaged that more than two expansible shells could be provided on the stud 10.
Where the spacer 14 comprises finger elements, these are preferably held together in an expansible fashion by means of a uniting claw 15 of thin sheet material.
Alternatively, a spring clip could be utilised to hold the fingers together. Preferably the leaves of the shell 12 will also be held together in releasable fashion by means of a spring clip (not shown). Preferably the uniting claw 15 or spring clip as the case may be will be of sufficient strength to ensure that the leaves of the shell 12 flare before the fingers flare.
~or efficient operation, it is preferred that the o_ter surface 14(a) of the spacer 14 and the inner surface l-(a) of the shell 12 which mate in use be substantially l 15~897 1l parallel. It is likewise preferred that the inner surface 14(b) of the spacer 14 and the outer tapered surface ll(a) of the plug 11 be parallel.
Clearly many variations of the invention exist which differ in matters of detail only, but do not depart from the principles set out in the consistory clauses.
For example, the outer surface of the shell 12 is illustrated as providing gripping formations and the exposed outer surface of the spacer 14 could likewise be provided with such gripping formations.
~ .
.
This invention relates to an expansion bolt.
Conventional rock bolts of the expanding type include a threaded stud member having a complementary threaded conical plug element towards its one end, and an expansible shell formed of two or more leaves on the stud the shell being adapted to be expanded by the plug in use upon rotation of the stud. A problem associated with such bolts is that the degree of expansion of the shell is limited and the bolts cannot be used in oversize holes.
10An object of the present invention is the provision of a novel expansion bolt which it is believed will be more versatile, from an expansion point of view than conventional -bolts.
According to one embodiment of the invention, there is provided an-expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured~to the stud member toward its remote trailing end, an expansible shell on the stud member, a spacer member disposed on the stud member intermediate the shell and the plug element. ~he spacer member being comprised of a plurality of elongated finger elements which are adapted to transversely flare the shell upon movement of the plug element towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, the deformable means having sufficient strength to ensure the flaring of said shell prior to the transverse flaring of said finger elements of said spacer member.
Preferably the expansible shell will comprise two or more longitudinal lcaf elements, with the spacer being .~
- ,, , , ~,, ,; , ~ 1588~7 adapted to engage the inner surfaces of at least some of the leaves of the shell to flare such leaves transversely.
Preferably the spacer will comprise two or more longitudinal finger elements capable of being flared transversely by means of the plug. In a preferred arrangement the spacer will thus take the form of a second expansible shell arranged in tandem with the first shell. It is also within the scope of the invention to provide more than two expansible shells disposed in tandem, if desirable.
In a preferred arrangement the remote ends of the fingers of the spacer will be deformably coupled together by means of a uniting claw forming the remote extremity of the bolt. Alternatively, the fingers could be releasably bound to the stud by means of an encircling spring clip or the like. The leaves of the shell could be likewise bound together. Preferably the means for coupling the fingers of the spacer together will be sufficient strength to ensure that the leaves of the shell open transversely in use prior to the fingers of the spacer.
It is further preferred that the surfaces of the leaves of the shell and the fingers of the spacer, which mate in use, are substantially parallel. It is likewise preferred that the mating surfaces of the fingers and tapered plug be parallel.
In order to illustrate the invention, an example thereof is described hereunder with reference to the accompanying drawing which is a sectioned elevation of an expansion bolt.
Referring to the drawing, an expansion bolt comprises a shaft or stud 10 which is threaded at its remote trailing end lO(a), and in use provides an anchorage at its leading end lO(b). A tapered plug 11 which has a complementary threaded .
' ' ' .
axial bore is screwed onto the threaded portion lO(a) of the stud 10. An expansible shell 12, which preferably comprises three longitudinal segments or leaves is also disposed on the threaded portion lO(a). In use, the shell 12 is prevented from moving towards the leading end of the stud 10 by means of a collar 13, A spacer 14 is disposed co-axially on the stud 10 intermediate the plug 11 and the shell 12. As shown in the drawing, the spacer 14 engages the inner faces of the shell 12 and is adapted to flare it transversely in use.
Preferably the spacer 14 will also comprise three finger or leaf elements which are in turn adapted to be flared transversely by means of the plug 11. In the arrangement illustrated, spacer 14 is thus in the nature of a second expansible shell arranged in tandem with the first shell 12. In circumstances it is envisaged that more than two expansible shells could be provided on the stud 10.
Where the spacer 14 comprises finger elements, these are preferably held together in an expansible fashion by means of a uniting claw 15 of thin sheet material.
Alternatively, a spring clip could be utilised to hold the fingers together. Preferably the leaves of the shell 12 will also be held together in releasable fashion by means of a spring clip (not shown). Preferably the uniting claw 15 or spring clip as the case may be will be of sufficient strength to ensure that the leaves of the shell 12 flare before the fingers flare.
~or efficient operation, it is preferred that the o_ter surface 14(a) of the spacer 14 and the inner surface l-(a) of the shell 12 which mate in use be substantially l 15~897 1l parallel. It is likewise preferred that the inner surface 14(b) of the spacer 14 and the outer tapered surface ll(a) of the plug 11 be parallel.
Clearly many variations of the invention exist which differ in matters of detail only, but do not depart from the principles set out in the consistory clauses.
For example, the outer surface of the shell 12 is illustrated as providing gripping formations and the exposed outer surface of the spacer 14 could likewise be provided with such gripping formations.
~ .
.
Claims (7)
1. An expansion bolt comprising an elongated stud member which is adapted to provide an anchorage at its leading end in use, a plug element secured to the stud member toward its remote trailing end, an expansible shell on the stud member, a spacer member disposed on the stud member intermediate the shell and the plug element, the spacer member being comprised of a plurality of elongated finger elements which are adapted to transversely flare the shell upon movement of the plug element towards the shell and deformable means coupling the ends of the finger elements adjacent the plug element together, said deformable means having sufficient strength to ensure the flaring of said shell prior to the transverse flaring of said finger elements of said spacer member.
2. The expansion bolt according to claim 1 wherein the expansible shell comprises two or more longitudinal leaf elements.
3. The expansion bolt according to claim 2 wherein the spacer member is adapted to engage the inner surfaces of at least some of said leaf elements of the shell to-flare such leaf elements transversely.
4. The expansion bolt according to claim 1 wherein the remote ends of the finger elements are deformably coupled together by means of a uniting claw forming the remote extremity of the bolt.
5. The expansion bolt according to claim 1 wherein the finger elements are releasably bound to the stud member by means of an encircling spring clip.
6. The expansion bolt according to claim 3 wherein the inner surfaces of the leaf elements of the shell and the outer surfaces of the spacer finger elements which mate in use, are substantially parallel.
7. The expansion bolt according to claim 1 wherein the inner surface of the finger elements of the spacer and the outer surface of the plug element are substantially parallel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA796930 | 1979-12-20 | ||
| ZA79/6930 | 1979-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1158897A true CA1158897A (en) | 1983-12-20 |
Family
ID=25574438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000367138A Expired CA1158897A (en) | 1979-12-20 | 1980-12-18 | Expansion bolt |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1158897A (en) |
| GB (1) | GB2065819B (en) |
| ZW (1) | ZW31380A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH655650B (en) * | 1982-02-23 | 1986-05-15 | ||
| GB2117859B (en) * | 1982-03-31 | 1986-02-19 | Robert Sneddon | Expanding fasteners for bath handles |
| BR8302012A (en) * | 1982-04-20 | 1983-12-27 | Artur Fischer | EXPANSION SHAFT FOR ANCHORAGE IN POROUS CONSTRUCTION MATERIALS |
| CN102140925B (en) * | 2011-03-09 | 2013-03-27 | 安徽佳泰矿业科技有限公司 | Expansion type high-strength anchor rod |
| JP6496305B2 (en) * | 2014-04-23 | 2019-04-03 | 株式会社豊和 | Anchor bolt |
-
1980
- 1980-12-18 ZW ZW313/80A patent/ZW31380A1/en unknown
- 1980-12-18 CA CA000367138A patent/CA1158897A/en not_active Expired
- 1980-12-19 GB GB8040847A patent/GB2065819B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2065819B (en) | 1983-08-24 |
| GB2065819A (en) | 1981-07-01 |
| ZW31380A1 (en) | 1981-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 20001220 |