US2625071A - Expansion bolt - Google Patents
Expansion bolt Download PDFInfo
- Publication number
- US2625071A US2625071A US193170A US19317050A US2625071A US 2625071 A US2625071 A US 2625071A US 193170 A US193170 A US 193170A US 19317050 A US19317050 A US 19317050A US 2625071 A US2625071 A US 2625071A
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- US
- United States
- Prior art keywords
- stud
- sections
- shell
- expander
- hole
- 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 - Lifetime
Links
- 210000002105 tongue Anatomy 0.000 description 7
- 229910001369 Brass Inorganic materials 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910001296 Malleable iron Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D21/008—Anchoring or tensioning means
Definitions
- This invention relates to expansion bolts. More particularly, it relates to the type of expansion bolts used for supporting the roof of a mine tunnel or the like.
- the bolts are installed in holes drilled into the roof of the mine and with the efficient drilling apparatus now available the installation of these bolts is a very simple and inexpensive matter as compared with the former practice of shoring the roof and sides of a mine tunnel with large timbers.
- the improved expansion bolt of this invention includes a relatively long rod or stud on which the expansible portion of the bolt is assembled.
- the bolt is inserted into a hole drilled into the mine roof, with the expansible portion deep in the hole.
- the lower end of the stud which is at the mouth of the hole supports means such as a plate or the like which covers the mouth of the hole and holds in place a relatively large area of the surface of the mine surroundin the hole.
- the expansible portion of the bolt is composed essentially of a multi-section shell, the several sections of which are positioned axially around the stud and held in place by an expansible ring or the like.
- the stud is rotated and these shell sections are forced apart and pressed tightly against the sides of the hole by an expander which is threaded onto the stud.
- the inner ends of the sections are engaged with a portion of the stud which is threaded reversely to the portion onto which the expander is screwed so that the shell and the expander are moved relatively toward one another when the stud is rotated. Consequently, the expansion action is very rapid.
- continued rotation of the stud forces the parts of the shell laterally as the thread on the shell rides up on the thread on the stud.
- the retaining means which holds the sections in assembled relation yields to the pressure exerted by the expander.
- the sections may be moved outwardly away from the studsufficiently to separate them from their threaded engagement with the stud.
- FIG. 1 is a view showing the expansion bolt when it is initially positioned in a hole drilled into a mine roof;
- Fig. 2 is a view similar to Fig. 1 but showing the bolt after it has been partially expanded;
- Fig. 3 is a view similar to Fig. 1 but showing the bolt further expanded and in tight engagement with the sides of the hole;
- Figs, 4 and 5 are cross sectional views taken on the lines l4 and 5-5, respectively, of Fig. 1;
- Fig. 6 is a cross-sectional view taken on the line 66 of Fig. 2.
- the preferred form of the expansion bolt includes a stud l which is relatively long; usually the stud will be from two to six or seven feet long.
- a substantially flat plate 2 encircles the lower end of the stud and is supported by the head 3 of the stud. When the bolt is put in the drilled hole 4, as shown in Fig. 1, the plate 2 covers the mouth of the hole. Ihe plate 2 will be tightened against the roof 5 of the mine as the bolt is expanded.
- the opposite end of the stud is provided with a right-hand thread 6 onto which the threaded central opening 1 of the expander 8 is threaded.
- the expander is of the conventional type. It is shaped like a cone frustrum except for the ribs 9 which prevent rotation between the expander and the expansible sections of the bolt, as described below.
- the outer, smooth surface N3 of the expander tapers from a smaller diameter at end I l to a larger diameter at end l2. The smaller end ll of the expander points towards the head or lower end of the stud.
- the expansible portion of the bolt is formed in two sections [3 and M which are assembled around the stud to form a shell below the expander.
- Each of the shell sections l3 and M has two tongues l5 and I5, respectively (see Fig. 4), which are spaced by longitudinal slots [6 and l 6', respectively.
- the adjacent tongues I5 and I5 on the two sections are separated by the slots ll which are the same size as the slots l6 and [6.
- Half of each slot H is formed on each section of the shell so that when the sections are assembled these halves mate to form the slots I 1 on opposite sides of the shell.
- Two or more sections may be used, but no one section will extend more than 180 around the stud since the sections are adapted to be moved radially away from the stud.
- the tongues I5, [5 of the shell sections each cover no more than of the surface of the stud. They are relatively thin at their tips and gradu- 4 3 ally become thicker towards the bottom of the slots I8 ,I 6' and I1.
- the outer surfaces of the shell sections are substantially cylindrical.
- then taper gradually inward to the location being spaced farthest from the stud at their tips. The angle of this taper is less than the angle atwhich the outer surface of the expander tapers.
- the wall [0 of the expander may slope outwardly at an angle of eight degrees, and the inner wall of the tongues may slope at an angle of four degrees.
- the sections of the shell are pressed outwardly and embedded in the wall of the hole 4 in the roof of the mine.
- the outer surface is advantageously provided with fiutes 22 to get a better grip on the material in which the hole 4 is located.
- each shell section below the slots is provided with a segment of a left-hand thread.
- the threaded portions of the several sections cooperate to form a complete left-hand, internal thread which is engaged with the lefthand thread 25 on the stud, below the righthand thread 5.
- the bolt is inserted in a hole, sections are heldin engagement with this thread 25 by the ring (it in the groove 3! in the outside of the lower end of the sections.
- This ring Sil may be of a pliable wire or rubber
- the ring shown is not continuous. The ends abut each other as indicated at numeral 33. The ring is sufficiently elastic to be snapped into place in the groove 31 after the sections are properly positioned.
- the sections are assembled so that the lower end it of the expander fits against the inner surface 2i 'of the tongues, near their tips, as shown in Fig. 1.
- Ribs 9 fit into the slots 11 between the shell sections in the manner shown in Fig. l.
- the sections may equally well be assembled with the ribs 9 in the slots l6 and IS.
- the ribs 9 prevent any relative rotation between the shell sections and the expander when the stud l is rotated.
- the stud is rotated in a clockwise direction.
- the expander and shell sections move relatively toward each other along their respective threads.
- the expander simultaneously presses the shell sections outwardly, starting at their tips. This flares the tips outwardly as shown in Fig. 1.
- the ring 3-8 yields and the sections are moved further from the stud (Fig. 2) until eventually the internal threads on the shell become completely disengaged from the threads 25 on the stud (-Fig. 3). Thereafter there is no further longitudinal movement of the shell with respect to the stud.
- the expander Upon rotation of the stud, after the threads have become disengaged, the expander continues to move along the thread 6 and, as it is drawn further and further into the shell it presses the shell sections farther and farther from the stud and embeds them more tightly in the sides of 4 the hole.
- the expander is capable of exerting extremely high pressure on the tongues and the ultimate position to which the expander will be moved will depend on the hardness of the stratum into which the hole is drilled.
- the plate -2 As the expander is drawn into the shell, the plate -2 is drawn up tightly against the surface of the mine roof, covering the hole. The plate may become embedded in the surface somewhat as shown in Fig. 3.
- the thread 6 may bind against thethread through the opening I of the expanderfso that the expander will have a tendency to rotate with the stud as the stud is turned. If this occurs the ribs 9 will press against the edges of their respective slots and tend to rotate the shell sections also. This does no harm.
- the expander can produce an enormous outward pressure on the shell sections.
- the sections are preferably made of malleable iron so that the tongues will bend under the pressure of the expander.
- This expansion bolt is particularly eificient and is easily manufactured and installed.
- the threads on the stud. may be rolled or cut in any suitable manner.
- an expansion bolt composed of a plurality of independent shell sections, a stud threaded at its outer end, yieldable retaining means around the inner end of the shell sections and holding them to the stud, and an expander threaded on the outer end of the stud with at least a part thereof within the outer end of the shell sections and adapted to spread the shell sections as the expander is turned further on to the stud
- the improvement which consists 'in the provision of 'a thread on the stud located inwardly from the -aforementioned thread and threaded in the reverse direction from the aforementioned thread, and threads on the inner surface of the shell sections near their inner end which cooperate with said reverse threads 'on the stud whereby when the stud is turned and the expander enters sr'uliciently far into the shell sections the reverse threads spread the inner ends of the shell sections laterally against the yieldable retaining means.
Description
Jan. 13, 1953 w. J. LEWIS 2,625,071
EXPANSION BOLT Filed Oct. 51, 1950 2 SHEETS SHEET 1 I: ggxwgsa up I IN V EN TOR.
WARREN J. LEWIS ATTORNEY Jan. 13, 1953 W. J. LEWIS EXPANSION BOLT Filed Oct. 51, 1950 HH I [ll 2 SHEETS-SHEET 2 IINVENTOR.
WARREN J. LEWIS i9? Z/hd' ATTORNEY Patented Jan. 13, 1953 EXPANSION BOLT Warren J. Lewis, Mansfield, Ohio, assignor to The Ohio Brass Company, Mansfield, Ohio, a corporation of New Jersey Application October 31, 1950, Serial No. 193,170
1 Claim.
' This invention relates to expansion bolts. More particularly, it relates to the type of expansion bolts used for supporting the roof of a mine tunnel or the like. The bolts are installed in holes drilled into the roof of the mine and with the efficient drilling apparatus now available the installation of these bolts is a very simple and inexpensive matter as compared with the former practice of shoring the roof and sides of a mine tunnel with large timbers.
,The improved expansion bolt of this invention includes a relatively long rod or stud on which the expansible portion of the bolt is assembled. The bolt is inserted into a hole drilled into the mine roof, with the expansible portion deep in the hole. The lower end of the stud which is at the mouth of the hole supports means such as a plate or the like which covers the mouth of the hole and holds in place a relatively large area of the surface of the mine surroundin the hole. The expansible portion of the bolt is composed essentially of a multi-section shell, the several sections of which are positioned axially around the stud and held in place by an expansible ring or the like. After the expansion bolt has been properly located in a hole the stud is rotated and these shell sections are forced apart and pressed tightly against the sides of the hole by an expander which is threaded onto the stud. The inner ends of the sections are engaged with a portion of the stud which is threaded reversely to the portion onto which the expander is screwed so that the shell and the expander are moved relatively toward one another when the stud is rotated. Consequently, the expansion action is very rapid. When resistance occurs to the movement of the shell and stud toward one another, continued rotation of the stud forces the parts of the shell laterally as the thread on the shell rides up on the thread on the stud.
As the stud is rotated to press the shell sections against the wall of the hole, the retaining means which holds the sections in assembled relation yields to the pressure exerted by the expander. The sections may be moved outwardly away from the studsufficiently to separate them from their threaded engagement with the stud.
Further rotation of the stud causes the expander to advance along its thread to press the shell sections tightly against the sides of the hole without any further movement of the sections into the hole, and at the same time the stud is drawn upwardly into the hole so that the plate is pressed tightly against the surface of the mine roof.
A preferred form of the invention is illustrated in the drawing. In the drawing-- Fig. 1 is a view showing the expansion bolt when it is initially positioned in a hole drilled into a mine roof;
Fig. 2 is a view similar to Fig. 1 but showing the bolt after it has been partially expanded;
Fig. 3 is a view similar to Fig. 1 but showing the bolt further expanded and in tight engagement with the sides of the hole;
Figs, 4 and 5 are cross sectional views taken on the lines l4 and 5-5, respectively, of Fig. 1; and
Fig. 6 is a cross-sectional view taken on the line 66 of Fig. 2.
The preferred form of the expansion bolt includes a stud l which is relatively long; usually the stud will be from two to six or seven feet long. A substantially flat plate 2 encircles the lower end of the stud and is supported by the head 3 of the stud. When the bolt is put in the drilled hole 4, as shown in Fig. 1, the plate 2 covers the mouth of the hole. Ihe plate 2 will be tightened against the roof 5 of the mine as the bolt is expanded.
The opposite end of the stud is provided with a right-hand thread 6 onto which the threaded central opening 1 of the expander 8 is threaded. The expander is of the conventional type. It is shaped like a cone frustrum except for the ribs 9 which prevent rotation between the expander and the expansible sections of the bolt, as described below. The outer, smooth surface N3 of the expander tapers from a smaller diameter at end I l to a larger diameter at end l2. The smaller end ll of the expander points towards the head or lower end of the stud.
The expansible portion of the bolt is formed in two sections [3 and M which are assembled around the stud to form a shell below the expander. Each of the shell sections l3 and M has two tongues l5 and I5, respectively (see Fig. 4), which are spaced by longitudinal slots [6 and l 6', respectively. When the sections are assembled, the adjacent tongues I5 and I5 on the two sections are separated by the slots ll which are the same size as the slots l6 and [6. Half of each slot H is formed on each section of the shell so that when the sections are assembled these halves mate to form the slots I 1 on opposite sides of the shell. Two or more sections may be used, but no one section will extend more than 180 around the stud since the sections are adapted to be moved radially away from the stud.
The tongues I5, [5 of the shell sections each cover no more than of the surface of the stud. They are relatively thin at their tips and gradu- 4 3 ally become thicker towards the bottom of the slots I8 ,I 6' and I1. At the start of any operation .(Fig. 1) the outer surfaces of the shell sections are substantially cylindrical. The inner surfaces 2| then taper gradually inward to the location being spaced farthest from the stud at their tips. The angle of this taper is less than the angle atwhich the outer surface of the expander tapers. For instance, the wall [0 of the expander may slope outwardly at an angle of eight degrees, and the inner wall of the tongues may slope at an angle of four degrees. Then as the expander is drawn down into the multi-section shell, the sections of the shell are pressed outwardly and embedded in the wall of the hole 4 in the roof of the mine. The outer surface is advantageously provided with fiutes 22 to get a better grip on the material in which the hole 4 is located.
The end 23 of each shell section below the slots is provided with a segment of a left-hand thread. When the sections are assembled on the stud the threaded portions of the several sections cooperate to form a complete left-hand, internal thread which is engaged with the lefthand thread 25 on the stud, below the righthand thread 5. When the bolt is inserted in a hole, sections are heldin engagement with this thread 25 by the ring (it in the groove 3! in the outside of the lower end of the sections.
This ring Sil may be of a pliable wire or rubber,
or may be of any expansible construction. The ring shown is not continuous. The ends abut each other as indicated at numeral 33. The ring is sufficiently elastic to be snapped into place in the groove 31 after the sections are properly positioned.
The sections are assembled so that the lower end it of the expander fits against the inner surface 2i 'of the tongues, near their tips, as shown in Fig. 1. Ribs 9 fit into the slots 11 between the shell sections in the manner shown in Fig. l. The sections may equally well be assembled with the ribs 9 in the slots l6 and IS. The ribs 9 prevent any relative rotation between the shell sections and the expander when the stud l is rotated.
, To tighten the expansion bolt in the hole 4 the stud is rotated in a clockwise direction. As the stud is rotated the expander and shell sections move relatively toward each other along their respective threads. The expander simultaneously presses the shell sections outwardly, starting at their tips. This flares the tips outwardly as shown in Fig. 1. As the expander enters further and further into the shell, the ring 3-8 yields and the sections are moved further from the stud (Fig. 2) until eventually the internal threads on the shell become completely disengaged from the threads 25 on the stud (-Fig. 3). Thereafter there is no further longitudinal movement of the shell with respect to the stud. Upon rotation of the stud, after the threads have become disengaged, the expander continues to move along the thread 6 and, as it is drawn further and further into the shell it presses the shell sections farther and farther from the stud and embeds them more tightly in the sides of 4 the hole. The expander is capable of exerting extremely high pressure on the tongues and the ultimate position to which the expander will be moved will depend on the hardness of the stratum into which the hole is drilled.
As the expander is drawn into the shell, the plate -2 is drawn up tightly against the surface of the mine roof, covering the hole. The plate may become embedded in the surface somewhat as shown in Fig. 3.
After the plate is in pressure contact with the roof of the mine the thread 6 may bind against thethread through the opening I of the expanderfso that the expander will have a tendency to rotate with the stud as the stud is turned. If this occurs the ribs 9 will press against the edges of their respective slots and tend to rotate the shell sections also. This does no harm.
The deeper the expander is drawn into the shell, the greater the outside diameter of the shell becomes, and the tighter the bolt is held in the hole. The expander can produce an enormous outward pressure on the shell sections. The sections are preferably made of malleable iron so that the tongues will bend under the pressure of the expander.
This expansion bolt is particularly eificient and is easily manufactured and installed. The threads on the stud. may be rolled or cut in any suitable manner.
The invention is in the appended claim.
What I claim'is:
In an expansion bolt composed of a plurality of independent shell sections, a stud threaded at its outer end, yieldable retaining means around the inner end of the shell sections and holding them to the stud, and an expander threaded on the outer end of the stud with at least a part thereof within the outer end of the shell sections and adapted to spread the shell sections as the expander is turned further on to the stud, the improvement which consists 'in the provision of 'a thread on the stud located inwardly from the -aforementioned thread and threaded in the reverse direction from the aforementioned thread, and threads on the inner surface of the shell sections near their inner end which cooperate with said reverse threads 'on the stud whereby when the stud is turned and the expander enters sr'uliciently far into the shell sections the reverse threads spread the inner ends of the shell sections laterally against the yieldable retaining means.
WARREN J. LEWIS.
REFERENCES CITED The following references are of record in the file of this patent:
uNf'rED STATES PATENTS Number Name Date 13,177 London 'et al. July 3, 1855 691,921 Wheeler Jan. 28, 1902 927,064 Mower July 6, 1909 1,372,291 Jacobs Mar. 22, 1921 1,434,394.- 'Matthes Nov. 7, 1922 2,521,065 Kempton Sept. 5, 1950
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US193170A US2625071A (en) | 1950-10-31 | 1950-10-31 | Expansion bolt |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US193170A US2625071A (en) | 1950-10-31 | 1950-10-31 | Expansion bolt |
Publications (1)
Publication Number | Publication Date |
---|---|
US2625071A true US2625071A (en) | 1953-01-13 |
Family
ID=22712504
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US193170A Expired - Lifetime US2625071A (en) | 1950-10-31 | 1950-10-31 | Expansion bolt |
Country Status (1)
Country | Link |
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US (1) | US2625071A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3000254A (en) * | 1957-10-04 | 1961-09-19 | Bethlehem Steel Corp | Expansion bolt means with thread means to couple the expansion shell to the bolt |
US3124030A (en) * | 1964-03-10 | Hxle established in rock | ||
US3227031A (en) * | 1962-07-05 | 1966-01-04 | Chester I Williams | Rock bolt anchor assembly |
US3304829A (en) * | 1964-04-27 | 1967-02-21 | Edward M Citron | Blind fasteners |
US3381567A (en) * | 1966-05-09 | 1968-05-07 | Torque Tension Bolt Company Pr | Mine roof bolt |
US3400627A (en) * | 1967-01-03 | 1968-09-10 | Edward M Citron | Blind fasteners with split deformable sleeve |
US3851560A (en) * | 1972-10-02 | 1974-12-03 | Deane C | Self-drilling expansion roof bolt |
US3858479A (en) * | 1973-09-14 | 1975-01-07 | Hi Shear Corp | Blind fastener set by rotary stud having threads of opposite hand |
US4481702A (en) * | 1982-09-30 | 1984-11-13 | The Boeing Company | Method of assembling threaded insert bushing within a working material |
US4940372A (en) * | 1987-02-21 | 1990-07-10 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Anchoring plug |
US5746556A (en) * | 1995-03-13 | 1998-05-05 | Kabushiki Kaisha Youma Kohboh | Anchor unit with expansive anchor member expanded by utilizing turning force of bolt |
US10113578B2 (en) * | 2014-08-04 | 2018-10-30 | Bernd Siegmund | Bolt for clamping adjoining parts |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US13177A (en) * | 1855-07-03 | John loudon and otto ahlstkom | ||
US691921A (en) * | 1901-03-30 | 1902-01-28 | Seth Wheeler | Expansion-bolt. |
US927064A (en) * | 1908-11-14 | 1909-07-06 | Herbert W Mower | Expansion-bolt. |
US1372291A (en) * | 1920-05-03 | 1921-03-22 | Benjamin F Jacobs | Expanding screw |
US1434394A (en) * | 1921-09-12 | 1922-11-07 | Ohio Brass Co | Expansion bolt |
US2521065A (en) * | 1946-04-23 | 1950-09-05 | Henry F Kempton | Anchor bolt |
-
1950
- 1950-10-31 US US193170A patent/US2625071A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US13177A (en) * | 1855-07-03 | John loudon and otto ahlstkom | ||
US691921A (en) * | 1901-03-30 | 1902-01-28 | Seth Wheeler | Expansion-bolt. |
US927064A (en) * | 1908-11-14 | 1909-07-06 | Herbert W Mower | Expansion-bolt. |
US1372291A (en) * | 1920-05-03 | 1921-03-22 | Benjamin F Jacobs | Expanding screw |
US1434394A (en) * | 1921-09-12 | 1922-11-07 | Ohio Brass Co | Expansion bolt |
US2521065A (en) * | 1946-04-23 | 1950-09-05 | Henry F Kempton | Anchor bolt |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124030A (en) * | 1964-03-10 | Hxle established in rock | ||
US3000254A (en) * | 1957-10-04 | 1961-09-19 | Bethlehem Steel Corp | Expansion bolt means with thread means to couple the expansion shell to the bolt |
US3227031A (en) * | 1962-07-05 | 1966-01-04 | Chester I Williams | Rock bolt anchor assembly |
US3304829A (en) * | 1964-04-27 | 1967-02-21 | Edward M Citron | Blind fasteners |
US3381567A (en) * | 1966-05-09 | 1968-05-07 | Torque Tension Bolt Company Pr | Mine roof bolt |
US3400627A (en) * | 1967-01-03 | 1968-09-10 | Edward M Citron | Blind fasteners with split deformable sleeve |
US3851560A (en) * | 1972-10-02 | 1974-12-03 | Deane C | Self-drilling expansion roof bolt |
US3858479A (en) * | 1973-09-14 | 1975-01-07 | Hi Shear Corp | Blind fastener set by rotary stud having threads of opposite hand |
US4481702A (en) * | 1982-09-30 | 1984-11-13 | The Boeing Company | Method of assembling threaded insert bushing within a working material |
US4940372A (en) * | 1987-02-21 | 1990-07-10 | Fischerwerke Artur Fischer Gmbh & Co. Kg | Anchoring plug |
US5746556A (en) * | 1995-03-13 | 1998-05-05 | Kabushiki Kaisha Youma Kohboh | Anchor unit with expansive anchor member expanded by utilizing turning force of bolt |
US10113578B2 (en) * | 2014-08-04 | 2018-10-30 | Bernd Siegmund | Bolt for clamping adjoining parts |
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