US20100080649A1 - Cable Coupler Having Retained Wedges - Google Patents
Cable Coupler Having Retained Wedges Download PDFInfo
- Publication number
- US20100080649A1 US20100080649A1 US12/632,355 US63235509A US2010080649A1 US 20100080649 A1 US20100080649 A1 US 20100080649A1 US 63235509 A US63235509 A US 63235509A US 2010080649 A1 US2010080649 A1 US 2010080649A1
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- US
- United States
- Prior art keywords
- passageway
- cable
- tapered portion
- retainer
- wedge
- 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.)
- Abandoned
Links
- 230000000717 retained effect Effects 0.000 title description 3
- 230000000712 assembly Effects 0.000 claims abstract description 10
- 238000000429 assembly Methods 0.000 claims abstract description 10
- 238000003780 insertion Methods 0.000 description 5
- 230000037431 insertion Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Images
Classifications
-
- 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
- E21D21/0093—Accessories
-
- 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
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/006—Anchoring-bolts made of cables or wires
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- 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
- F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
- F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
- F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
- F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
- F16G11/048—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by moving a surface into the cable
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- 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
- F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
- F16B2200/69—Redundant disconnection blocking means
- F16B2200/71—Blocking disengagement of catches or keys
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T403/00—Joints and connections
- Y10T403/70—Interfitted members
- Y10T403/7047—Radially interposed shim or bushing
- Y10T403/7051—Wedging or camming
- Y10T403/7052—Engaged by axial movement
- Y10T403/7054—Plural, circumferentially related shims between members
Definitions
- the invention relates generally to cable couplers for joining a pair of cables under tension and, more specifically, to a cable coupler having retained wedges.
- Cable couplers that couple two tensioned cables together are used in many applications.
- a cable roof truss is created in an underground mine passage generally consists of a tensioned cable extending between a pair of embedded roof anchors.
- the tensioned cable is made up of two sections which must be joined by a coupler.
- the construction industry also uses joined cables in a number of applications, such as in column wrapping, ring-tensioning applications, or with barrier cable installations often seen in parking garages.
- a first design for a cable coupler is known as a spacer tube, often rectangular in section that has two barrels extending through the coupler.
- the cables are pulled through the barrels in opposite directions and tensioned.
- a set of wedge pieces are placed in the barrels adjacent the cables and the cables are released.
- the cables pull backward under their own tension, drawing the wedge pieces into the barrel.
- the wedge pieces grip the cables and lock the cables relative to the coupler.
- a second design incorporates a curved path for each of the cables.
- This design commonly known as the “dog bone” coupler due to the distinctive shape of the coupler, is different than the spacer tube in that the passages for the cables are curved to reduce sharp edges and to more evenly distribute the forces along the cable.
- FIG. 1 is an elevational view, partly in section, of a cable truss system incorporating a cable coupler assembled in accordance with the teachings of the present invention and shown disposed in a mine passage.
- FIG. 2 is a perspective view of an exemplary cable coupler for the cable truss system of FIG. 1 shown prior to the insertion of the cables and constructed in accordance with the teachings of the present invention.
- FIG. 3 is an exploded view of the cable coupler of FIG. 2 .
- FIG. 4 is a perspective view of the cable coupler of FIG. 2 and further including a pair of anchored cables.
- FIG. 5 is a partial section view taken along line 5 - 5 in FIG. 4 and illustrating one of the cables being inserted into the cable coupler and about to contact a plug.
- FIG. 6 is a top view of the cable coupler, partially in section, with the first cable being fully inserted through the cable coupler.
- FIG. 7 is a top view of the cable coupler, partially in section, with the first cable being released after being tensioned in the cable coupler.
- FIG. 8 is an enlarged fragmentary isometric view of an alternate embodiment for the retainer.
- FIG. 9 is an enlarged fragmentary isometric view similar to FIG. 8 , but illustrating yet another alternate embodiment for the retainer.
- FIG. 10 is an elevational view, partly in section, of a truss shoe having a tapered bore.
- the cable coupler 10 includes a body 12 that has a first end 14 and a second end 16 and has a first passageway 18 and a second passageway 20 that each extend from the first end 14 to the second end 16 .
- a clip 22 is disposed on the body 12 adjacent the first end 14 .
- a wedge assembly 24 is disposed in the first passageway 18 at the first end 14 and may be engaged by the retaining clip 22 as will be explained in greater detail below.
- a cable truss system 30 incorporates the cable coupler 10 and is used to support a roof 32 of a mine passage 34 .
- a typical mine passage 34 may incorporate one or more of such cable truss systems 30 spaced along the length of the mine passage 34 to help support the roof 32 of the mine passage 34 .
- the cable truss system 30 includes a first cable 36 with a first end 38 and a second end 40 .
- a first bore 42 extends into the roof 32 at an angle outward from the mine passage 34 .
- the second end 40 of the first cable 36 is disposed in the first bore 42 .
- a resin cartridge 44 is also disposed in the first bore 42 and secures the second end 40 of the first cable 36 in the first bore 42 .
- Other known elements and methods can be used to secure the first cable 36 in the first bore 42 .
- the first cable 36 extends through a first ring eye plate 46 and presses the eye plate 46 upward against the roof 32 of the mine passage 34 .
- the cable truss system 30 includes a second cable 48 with a first end 50 and a second end 52 .
- a second bore 54 extends into the mine roof 32 at an angle outward from the mine passage 34 .
- the second end 52 of the second cable 48 is disposed in the second bore 54 .
- a second resin cartridge 56 is also disposed in the second bore 54 and secures the second end 52 of the second cable 48 in the second bore 54 .
- other known elements and methods can be used to secure the second cable 48 in the second bore 54 .
- the second cable 48 extends through a second ring eye plate 58 and presses the eye plate 58 upward against the roof 32 of the mine passage 34 .
- the first end 38 of the first cable 36 and the first end 50 of the second cable 48 are both disposed in the cable coupler 10 , as will be detailed herein.
- the cable coupler 10 maintains both the first cable 36 and the second cable 48 in a state of tension so as to create a compressive force on the roof 32 in the mine passage 34 to help support the roof 32 .
- the cable coupler 10 is depicted in an assembled view ( FIG. 2 ), and an exploded view ( FIG. 3 ), prior to the insertion of either the first or second cables 36 , 48 .
- the cable coupler 10 includes the body 12 with the first end 14 , the second end 16 , and a sidewall 60 extending between the first end 14 and the second end 16 .
- the sidewall 60 takes a generally curved hour glass or dog bone shape.
- the first passageway 18 and the second passageway 20 extend from the first end 14 to the second end 16 .
- the passageways are disposed in a common plane.
- the first passageway 18 includes a tapered portion 62 which forms a seat for the wedges as would be common practice.
- the tapered portion 62 is generally conically shaped and is disposed adjacent the first passageway 18 near the first end 14 .
- the cable coupler 10 includes a cable lock 64 disposed adjacent the first end 14 of the first passageway 18 .
- the cable lock 64 includes the wedge assembly 24 , the clip 22 , and a plug 66 .
- the retaining clip 22 may be positioned to engage the wedge assembly 24 as shown in FIG. 2 , or it may be shifted away from the wedge assembly 24 as is shown at the right side of each of FIGS. 5 and 6 , as well as on both sides of FIG. 7 .
- the wedge assembly 24 includes at least a first wedge piece 68 and a second wedge piece 70 that combine to substantially form a truncated cone with a base 72 and a tip 74 . Three-piece wedge assemblies or other suitable wedge assemblies may also be employed.
- Each of the first wedge piece 68 and the second wedge piece 70 have an engaging face 76 a , 76 b such that when the wedge pieces 68 , 70 are assembled to form the wedge assembly 24 , the engaging faces 76 a , 76 b are in confronting relationship.
- Each of the first and second wedge pieces 68 , 70 also include an internal cylindrical section 78 a , 78 b . When the wedge pieces 68 , 70 are assembled to form the wedge assembly 24 , the internal cylindrical sections 78 a , 78 b form a generally circular passage way 80 within the wedge assembly 24 .
- a set of teeth 82 is disposed on the internal cylindrical sections 78 a , 78 b and is formed in a known way such that an object in the circular passage way 80 may be slid from the tip 74 of the wedge assembly 24 towards the base 72 , but locked with respect to sliding from the base 72 toward the tip 74 .
- a groove or recess 84 is disposed on the outside surface of each of the wedge pieces 68 70 , generally adjacent to the base 72 . The groove 84 encircles the wedge assembly 24 at a generally constant distant from the base 72 .
- the clip 22 includes a first end 86 disposed in a first recess 88 in the sidewall 60 near the first end 14 of the first passageway 18 .
- the clip 22 further includes a second end 90 disposed in a second recess 90 (obstructed in the Fig.) and formed opposite the first recess 88 .
- the clip 22 includes a pair of lateral portions 92 a , 92 b extending away from the first and second ends 86 , 90 , and a pair of side portions 94 a , 94 b extending towards each other from the lateral portions 92 a , and 92 b .
- the clip 22 is generally C-shaped, and may be formed of spring steel or other material, and preferably may be flexible or resilient enough to be detached from the body 12 by withdrawing the ends 86 , 90 from their corresponding recesses 88 .
- a ring 96 is sized to be seated in the groove 84 of the wedge assembly 24 , and may serve to assist in retaining the wedge assembly 24 within the tapered portion 62 , and may also generally maintain the wedge pieces 68 , 70 together as the first cable 36 is pushed through the first passageway 18 and through the wedge assembly 24 .
- the ring 96 is preferably a resilient O-ring formed from, for example, rubber or other suitable material.
- the ring 96 can also be made from plastic or a suitable metal, and is preferably flexible facilitate easy installation of the ring 96 into the groove 84 around the wedge assembly 24 .
- the plug 66 of the cable coupler 10 is disposed in the circular passage way 80 in the wedge assembly 24 .
- the plug 66 maintains the wedge pieces 68 , 70 slightly apart from each other, and the ring 96 maintains the wedge pieces 68 , 70 against the plug 66 .
- the plug 66 assists in holding the wedge assembly 24 in a position to receive the first cable 36 when the cable is inserted as shown in FIG. 5 .
- a second cable lock 100 is disposed adjacent a second tapered portion 102 in the second passageway 20 on the second end 16 .
- the second cable lock 100 can include the same elements as the first cable lock 64 , such as a second wedge assembly 104 with individual wedge pieces 104 a , 104 b , a second clip 22 , a second ring 96 , and a second plug 66 .
- the retaining clip 22 shown to the right of the Figure is shown in an open position as will be explained in greater detail below.
- the cable coupler 10 is shown with first and second cables 36 , 48 disposed in the first and second passageways 18 , 20 , respectively.
- the first end 38 of the first cable 36 extends through the first passageway 18 and the wedge assembly 24 and out the first end 14 of the first passageway 18 .
- the first end 50 of the second cable 48 extends into through the second passageway 20 .
- the wedge assemblies 24 when each of the first and second cables 36 , 48 are under tension, the wedge assemblies 24 , by being pulled into the corresponding tapered portion of the passageways, will apply a gripping force to the cables and thus secure the first and second cables 36 , 48 relative to the coupler 10 and each other.
- the first and second passageway 18 , 20 are each curved to generally follow the hour glass shape of the body 12 and extend generally in the same plane.
- the second end 16 of the first passageway 18 defines a first axis A 1 and the first end 14 of the second passageway 20 defines a second axis A 2 that is generally aligned with the first axis A 1 .
- the second end 16 of the first passageway 18 includes a relief 110 in which the cross section of the first passageway 18 is enlarged. This eases the insertion of the first cable 36 into the first passageway 18 . It further removes sharp corners that may abrade or damage the first cable 36 when it is under tension.
- the second passageway 20 includes a similar relief 112 at the first end 14 .
- the process of inserting the cables 36 , 48 into the cable coupler 10 and locking the cables 36 , 48 in the cable coupler 10 will now be described.
- the first cable 36 is shown as it is being inserted into the first passageway 18
- the second cable 48 is shown already inserted through the second passageway 20 almost to the plug 66 .
- the process of the insertion and locking of the second cable 48 is the same process as for the first cable 36 .
- the first cable 36 is shown inserted partially into the first passageway 18 .
- this step is performed by hand as a user simply holds the anchor 10 in one hand and the first end 38 of the first cable 36 in the other hand and inserts the first cable 36 into the first passageway 18 .
- the clip 22 and the ring 96 cooperate to maintain both wedge pieces of the wedge assembly 24 in the tapered portion of the passageway, thus preventing or minimizing the chances that one or more wedge pieces will be dropped and/or lost.
- the first cable 36 has been inserted to the point where it is in confronting relationship with the plug 66 .
- the first end 38 of the first cable 36 contacts the plug 66 .
- the plug 66 maintains the wedge assembly 24 outwardly such that the wedge assembly 24 is in a first position to receive the first cable 36 .
- the plug 66 can have a diameter slightly larger than the diameter of the first cable 36 to ensure that the wedge assembly 24 is held outwardly far enough to ease the entrance of the first cable 36 into the circular passage 80 of the wedge assembly 24 .
- the tip of the first cable 36 may be sized to ensure that it slides easily into the wedge assembly 24 .
- the first cable 36 is pushed further through the first passageway 18 and pushes the plug 66 through the wedge assembly 24 until the first end 38 of the first cable 36 has been pushed through the wedge assembly 24 and extends out past the first end 14 of the first passageway 18 .
- the teeth 82 of the wedge assembly 24 are oriented to allow the plug 66 and the first cable 36 to slide from the second end 16 to the first end 14 of the first passageway 18 , but to grip and hold the first cable 36 fast as it is placed under tension and tends to slide toward the second end 16 of the first passageway 18 .
- the second cable 48 can be inserted in the same way either before or after the insertion of the first cable 36 .
- the user can tighten the first and second cables 36 , 48 by hand by pulling each of them until they are taut or by suitable machine tensioning.
- the clip 22 maintains the wedge assembly 24 in position generally in the tapered portion 62 as the first cable 36 is inserted through the wedge assembly 24 and the plug 66 is pushed out.
- the wedge assembly 24 has been pulled into the tapered portion 62 .
- the ring 96 is preferably resilient enough so as not to interfere with the motion of the wedge pieces into the tapered portion 62 such that the ring 96 does not interfere with the stressing of the first cable 24 .
- a tensioner is generally employed to pull the first cable 36 through the anchor 10 .
- the tensioner releases the first cable 36 .
- FIG. 7 after the first cable 36 is released, the tension is distributed over both the first cable 36 and the second cable 48 , and the cables 36 , 48 pull back through the body 12 in directions A 3 , A 4 .
- the teeth 82 of the wedge assemblies 24 , 104 engage the first and second cables 36 , 48 as the cables 36 , 48 pull back.
- the wedge assemblies 24 , 104 are pulled back into the body 12 until they engage their respective tapered portions 62 , 102 .
- the wedges assemblies 24 , 104 are pulled back into their tapered portion 62 , 102 , the wedges assemblies 24 , 104 are forced by the tapered portions 62 , 102 to close progressively tighter around the first and second cables 36 , 48 to a second position where the cables 36 , 48 are locked in place.
- the tension in the first cable 36 creates a force F 1 along the first axis A 1 and the tension in the second cable 48 creates a force F 2 along the second axis A 2 . Because the first axis A 1 and the second axis A 2 are generally aligned, the force F 1 and the force F 2 are opposite one another. This may serve to minimize any torque that would be created if the forces F 1 and F 2 were skew. Accordingly, the cable coupler 10 does not twist or twists only at a minimum, and the cables 36 , 48 are not forced against the edges of the passageways 18 , 20 .
- the clip 22 holding the wedge pieces 68 , 70 in the wedge seat allows the user to simply insert the first cable 36 through the first passageway 18 with perhaps less manipulation of the wedge pieces 68 , 70 .
- the user may not have to manually insert the wedge pieces 68 , 70 into the tapered portion 62 after the cable 36 is placed in the first passageway 18 , as in the prior art.
- the disclosed example further alleviates the problem associated with dark working conditions of a mine passage in which the small wedges may become lost.
- the manufacturer may find the disclosed example lessens or eliminates the need to include extra wedge pieces.
- the present design may be faster and easier to use relative to the prior art.
- the wedge assembly 24 can be installed in the tapered portion 62 as follows.
- the plug 66 is positioned between the individual wedge pieces 68 , 70 of the wedge assembly 24 , and the ring 96 is positioned into the groove 84 formed adjacent the ends of the wedge pieces 68 , 70 .
- the retaining clip 22 (as well as the retaining clip 22 at the left of the Fig.) may be pivoted to an open position by pivoting the retaining clip 22 in the direction B about an axis C (extending into the plane of the Figure) formed by the recesses 88 . In the open position, such as is shown to the right of FIG.
- a central portion 23 of the clip 22 is moved away from the opening of the tapered portion, such that the tapered portion is unobstructed by the clip 22 .
- a wedge assembly 24 , plug, and ring assembled as discussed above, may be freely inserted into the corresponding tapered portion of the corresponding passageway.
- the wedge pieces 68 , 70 and the plug 66 held together by the ring 96 , may then be inserted as a single unit into the tapered portion 62 of the passageway.
- the clip 22 may be shifted to a closed position, such as is shown to the left of FIG. 5 .
- the clip 22 may pivot in the direction D about the axis C (the axis C extends into the plane of the Figure).
- the central portion 23 of the clip 22 is positioned to obstruct a portion of the passageway, such that the wedge assembly 24 disposed in the tapered portion is retained in the passage by the clip 22 .
- a retainer 290 takes the form of a U-shaped pin having a pair of prongs 291 and a cross member 292 .
- the body 126 takes the form of a truss shoe 126 A (shown in FIG. 10 ).
- the truss shoe 126 A may be used in the roof truss of FIG. 1 in place of the ring eye plates 46 and 58 .
- the body 126 may be the same or similar to the body 12 of the cable coupler 10 discussed above.
- the body 126 includes a pair of apertures 293 that extend into a bore 140 having a tapered portion similar to the tapered portion discussed above.
- the spacing between the pins 291 is sufficient to permit the plug 185 to pass into the recess 127 .
- the retainer 290 prevents the individual wedge pieces of the wedge assembly 146 from exiting the bore 140 into the recess 127 .
- a retainer 390 takes the form of a disc 391 having an annular flange 392 .
- the retainer 390 of FIG. 26 may generally resemble a bottle-top shape, and may include a central aperture 393 surrounded by an outer portion 394 .
- the body 126 again is in the form of a truss shoe, but alternatively may be the same or similar to the body 12 of the cable coupler 10 discussed above.
- the retainer 390 is disposed in the bore 140 of the truss shoe, such that the outer portion 394 blocks a portion of the bore 140 .
- the central aperture 393 is preferably sized to permit the plug 185 of the wedge assembly 146 (both of which are discussed above in greater detail and are shown in the earlier-described Figs.) to pass through the aperture 393 .
- the flange 392 extends outwardly away from the bore and toward the recess 127 .
- the retainer 390 may be oriented so that the flange 392 extends inwardly into the bore 140 .
- the retainer 390 may be constructed from a rigid material or from a deformable material, such as metal, certain plastics, etc.
- the retainer 390 is positioned to retain the individual wedge pieces of the wedge assembly 146 in the bore 140 , while permitting the plug 185 to be dislodged in a manner similar to that described above.
- the retainer 390 preferably is maintained in the bore 140 by an interference fit between the flange 392 and the inner surface of the bore 140 .
Abstract
A cable coupler includes a body having a first end, a second end, and first and second passageways sized and shaped to receive a cable, with each passageway including a tapered portion. A wedge assembly is disposed in each tapered portion to secure a cable to the body. A clip assembly is attached to the body adjacent the tapered portion of each of the passageways and is shiftable between a closed position in which the clip assembly is positioned to prevent an adjacent one of the wedge assemblies from exiting the corresponding passageway and an open position in which the adjacent wedge assembly is insertable into the tapered portion of the corresponding passageway.
Description
- This application is a continuation in part of U.S. patent application Ser. No. 11/548,170, filed Oct. 10, 2006, and Ser. No. 11/224,492, filed Sep. 12, 2005, which in turn claimed the benefit of provisional application Ser. No. 60/610,370, filed Sep. 16, 2004. The present application incorporates by reference the entire disclosure of each of the prior-filed applications.
- The invention relates generally to cable couplers for joining a pair of cables under tension and, more specifically, to a cable coupler having retained wedges.
- Cable couplers that couple two tensioned cables together are used in many applications. For example, in underground mining operations a cable roof truss is created in an underground mine passage generally consists of a tensioned cable extending between a pair of embedded roof anchors. Many times, the tensioned cable is made up of two sections which must be joined by a coupler. The construction industry also uses joined cables in a number of applications, such as in column wrapping, ring-tensioning applications, or with barrier cable installations often seen in parking garages.
- A first design for a cable coupler is known as a spacer tube, often rectangular in section that has two barrels extending through the coupler. The cables are pulled through the barrels in opposite directions and tensioned. A set of wedge pieces are placed in the barrels adjacent the cables and the cables are released. The cables pull backward under their own tension, drawing the wedge pieces into the barrel. The wedge pieces grip the cables and lock the cables relative to the coupler.
- A second design incorporates a curved path for each of the cables. This design, commonly known as the “dog bone” coupler due to the distinctive shape of the coupler, is different than the spacer tube in that the passages for the cables are curved to reduce sharp edges and to more evenly distribute the forces along the cable. Again, after the cables are tensioned and released, the cables and the retaining wedges are drawn into the tapered passageways of the coupler, drawing the wedge pieces into progressively greater contact with the cables so that the wedge pieces grip and lock the cables relative to the coupler.
- In both of the aforementioned designs, the user must first insert both cables through the barrels of the coupler and then, using a tensioner, place the cables under tension. The wedge pieces must be manually placed adjacent the cables and in the tapered portion of the barrels. Unfortunately, these loose wedge pieces can easily fall to the ground during installation, and the wedge pieces may be lost in the darkness of a mine passage. Valuable time may be lost looking for and recovering any dropped or lost wedge pieces. To alleviate this often-encountered problem, suppliers generally provide extra wedges with the cable coupler. However, even if the wedge pieces are not lost, time and manual dexterity are required to insert the wedges into the coupler, which may have to be accomplished in a cold and/or dark setting.
-
FIG. 1 is an elevational view, partly in section, of a cable truss system incorporating a cable coupler assembled in accordance with the teachings of the present invention and shown disposed in a mine passage. -
FIG. 2 is a perspective view of an exemplary cable coupler for the cable truss system ofFIG. 1 shown prior to the insertion of the cables and constructed in accordance with the teachings of the present invention. -
FIG. 3 is an exploded view of the cable coupler ofFIG. 2 . -
FIG. 4 is a perspective view of the cable coupler ofFIG. 2 and further including a pair of anchored cables. -
FIG. 5 is a partial section view taken along line 5-5 inFIG. 4 and illustrating one of the cables being inserted into the cable coupler and about to contact a plug. -
FIG. 6 is a top view of the cable coupler, partially in section, with the first cable being fully inserted through the cable coupler. -
FIG. 7 is a top view of the cable coupler, partially in section, with the first cable being released after being tensioned in the cable coupler. -
FIG. 8 is an enlarged fragmentary isometric view of an alternate embodiment for the retainer. -
FIG. 9 is an enlarged fragmentary isometric view similar toFIG. 8 , but illustrating yet another alternate embodiment for the retainer. -
FIG. 10 is an elevational view, partly in section, of a truss shoe having a tapered bore. - While the disclosure is susceptible to various modifications and alternative constructions, certain illustrative embodiments thereof have been shown in the drawings and will be described below in detail. It should be understood, however, that there is no intention to limit the disclosure to the specific forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and the equivalents falling within the spirit and scope of the invention as defined by the appended claims.
- Referring now to the drawings, and specifically to
FIG. 5 , acable coupler 10 is depicted. Thecable coupler 10 includes abody 12 that has afirst end 14 and asecond end 16 and has afirst passageway 18 and asecond passageway 20 that each extend from thefirst end 14 to thesecond end 16. Aclip 22 is disposed on thebody 12 adjacent thefirst end 14. Awedge assembly 24 is disposed in thefirst passageway 18 at thefirst end 14 and may be engaged by the retainingclip 22 as will be explained in greater detail below. - Referring back to
FIG. 1 , acable truss system 30 incorporates thecable coupler 10 and is used to support aroof 32 of amine passage 34. Atypical mine passage 34 may incorporate one or more of suchcable truss systems 30 spaced along the length of themine passage 34 to help support theroof 32 of themine passage 34. Thecable truss system 30 includes afirst cable 36 with afirst end 38 and asecond end 40. Afirst bore 42 extends into theroof 32 at an angle outward from themine passage 34. Thesecond end 40 of thefirst cable 36 is disposed in thefirst bore 42. In this example, aresin cartridge 44 is also disposed in thefirst bore 42 and secures thesecond end 40 of thefirst cable 36 in thefirst bore 42. Other known elements and methods can be used to secure thefirst cable 36 in thefirst bore 42. Thefirst cable 36 extends through a firstring eye plate 46 and presses theeye plate 46 upward against theroof 32 of themine passage 34. - The
cable truss system 30 includes asecond cable 48 with afirst end 50 and asecond end 52. Asecond bore 54 extends into themine roof 32 at an angle outward from themine passage 34. Thesecond end 52 of thesecond cable 48 is disposed in thesecond bore 54. In this example, asecond resin cartridge 56 is also disposed in thesecond bore 54 and secures thesecond end 52 of thesecond cable 48 in thesecond bore 54. Again, other known elements and methods can be used to secure thesecond cable 48 in thesecond bore 54. Thesecond cable 48 extends through a secondring eye plate 58 and presses theeye plate 58 upward against theroof 32 of themine passage 34. - The
first end 38 of thefirst cable 36 and thefirst end 50 of thesecond cable 48 are both disposed in thecable coupler 10, as will be detailed herein. Thecable coupler 10 maintains both thefirst cable 36 and thesecond cable 48 in a state of tension so as to create a compressive force on theroof 32 in themine passage 34 to help support theroof 32. - Referring now to
FIGS. 2 and 3 , thecable coupler 10 is depicted in an assembled view (FIG. 2 ), and an exploded view (FIG. 3 ), prior to the insertion of either the first orsecond cables cable coupler 10 includes thebody 12 with thefirst end 14, thesecond end 16, and asidewall 60 extending between thefirst end 14 and thesecond end 16. In this example, thesidewall 60 takes a generally curved hour glass or dog bone shape. - The
first passageway 18 and thesecond passageway 20 extend from thefirst end 14 to thesecond end 16. Preferably, the passageways are disposed in a common plane. Thefirst passageway 18 includes a taperedportion 62 which forms a seat for the wedges as would be common practice. The taperedportion 62 is generally conically shaped and is disposed adjacent thefirst passageway 18 near thefirst end 14. - The
cable coupler 10 includes acable lock 64 disposed adjacent thefirst end 14 of thefirst passageway 18. Thecable lock 64 includes thewedge assembly 24, theclip 22, and aplug 66. - The retaining
clip 22 may be positioned to engage thewedge assembly 24 as shown inFIG. 2 , or it may be shifted away from thewedge assembly 24 as is shown at the right side of each ofFIGS. 5 and 6 , as well as on both sides ofFIG. 7 . Thewedge assembly 24 includes at least afirst wedge piece 68 and asecond wedge piece 70 that combine to substantially form a truncated cone with abase 72 and atip 74. Three-piece wedge assemblies or other suitable wedge assemblies may also be employed. - Each of the
first wedge piece 68 and thesecond wedge piece 70 have an engagingface wedge pieces wedge assembly 24, the engaging faces 76 a, 76 b are in confronting relationship. Each of the first andsecond wedge pieces wedge pieces wedge assembly 24, the internal cylindrical sections 78 a, 78 b form a generallycircular passage way 80 within thewedge assembly 24. A set ofteeth 82 is disposed on the internal cylindrical sections 78 a, 78 b and is formed in a known way such that an object in thecircular passage way 80 may be slid from thetip 74 of thewedge assembly 24 towards thebase 72, but locked with respect to sliding from the base 72 toward thetip 74. A groove orrecess 84 is disposed on the outside surface of each of thewedge pieces 68 70, generally adjacent to thebase 72. Thegroove 84 encircles thewedge assembly 24 at a generally constant distant from thebase 72. - The
clip 22 includes afirst end 86 disposed in afirst recess 88 in thesidewall 60 near thefirst end 14 of thefirst passageway 18. Theclip 22 further includes asecond end 90 disposed in a second recess 90 (obstructed in the Fig.) and formed opposite thefirst recess 88. Theclip 22 includes a pair oflateral portions 92 a, 92 b extending away from the first and second ends 86, 90, and a pair ofside portions 94 a, 94 b extending towards each other from thelateral portions 92 a, and 92 b. As can be seen inFIG. 3 , theclip 22 is generally C-shaped, and may be formed of spring steel or other material, and preferably may be flexible or resilient enough to be detached from thebody 12 by withdrawing theends recesses 88. - A
ring 96 is sized to be seated in thegroove 84 of thewedge assembly 24, and may serve to assist in retaining thewedge assembly 24 within the taperedportion 62, and may also generally maintain thewedge pieces first cable 36 is pushed through thefirst passageway 18 and through thewedge assembly 24. Thering 96 is preferably a resilient O-ring formed from, for example, rubber or other suitable material. Thering 96 can also be made from plastic or a suitable metal, and is preferably flexible facilitate easy installation of thering 96 into thegroove 84 around thewedge assembly 24. - The
plug 66 of thecable coupler 10 is disposed in thecircular passage way 80 in thewedge assembly 24. Theplug 66 maintains thewedge pieces ring 96 maintains thewedge pieces plug 66. Theplug 66 assists in holding thewedge assembly 24 in a position to receive thefirst cable 36 when the cable is inserted as shown inFIG. 5 . - As can be best seen in
FIG. 5 , asecond cable lock 100 is disposed adjacent a secondtapered portion 102 in thesecond passageway 20 on thesecond end 16. Thesecond cable lock 100 can include the same elements as thefirst cable lock 64, such as asecond wedge assembly 104 withindividual wedge pieces 104 a, 104 b, asecond clip 22, asecond ring 96, and asecond plug 66. It will be appreciated that inFIG. 5 , the retainingclip 22 shown to the right of the Figure is shown in an open position as will be explained in greater detail below. - Referring back to
FIG. 4 , thecable coupler 10 is shown with first andsecond cables second passageways first end 38 of thefirst cable 36 extends through thefirst passageway 18 and thewedge assembly 24 and out thefirst end 14 of thefirst passageway 18. Likewise, thefirst end 50 of thesecond cable 48 extends into through thesecond passageway 20. As will be described herein, when each of the first andsecond cables wedge assemblies 24, by being pulled into the corresponding tapered portion of the passageways, will apply a gripping force to the cables and thus secure the first andsecond cables coupler 10 and each other. - Referring now to
FIG. 5 , the configuration of the first andsecond passageway 18, is shown. The first andsecond passageway body 12 and extend generally in the same plane. Thesecond end 16 of thefirst passageway 18 defines a first axis A1 and thefirst end 14 of thesecond passageway 20 defines a second axis A2 that is generally aligned with the first axis A1. Thesecond end 16 of thefirst passageway 18 includes arelief 110 in which the cross section of thefirst passageway 18 is enlarged. This eases the insertion of thefirst cable 36 into thefirst passageway 18. It further removes sharp corners that may abrade or damage thefirst cable 36 when it is under tension. Thesecond passageway 20 includes asimilar relief 112 at thefirst end 14. - The process of inserting the
cables cable coupler 10 and locking thecables cable coupler 10 will now be described. Referring again toFIG. 5 , thefirst cable 36 is shown as it is being inserted into thefirst passageway 18, and thesecond cable 48 is shown already inserted through thesecond passageway 20 almost to theplug 66. As will be understood, due to the symmetry of theanchor 10, the process of the insertion and locking of thesecond cable 48 is the same process as for thefirst cable 36. - The
first cable 36 is shown inserted partially into thefirst passageway 18. In general, this step is performed by hand as a user simply holds theanchor 10 in one hand and thefirst end 38 of thefirst cable 36 in the other hand and inserts thefirst cable 36 into thefirst passageway 18. It will be appreciated that in accordance with the disclosed example theclip 22 and thering 96 cooperate to maintain both wedge pieces of thewedge assembly 24 in the tapered portion of the passageway, thus preventing or minimizing the chances that one or more wedge pieces will be dropped and/or lost. - As shown in
FIG. 5 , thefirst cable 36 has been inserted to the point where it is in confronting relationship with theplug 66. As the user pushes thefirst cable 36 further, thefirst end 38 of thefirst cable 36 contacts theplug 66. Theplug 66 maintains thewedge assembly 24 outwardly such that thewedge assembly 24 is in a first position to receive thefirst cable 36. Theplug 66 can have a diameter slightly larger than the diameter of thefirst cable 36 to ensure that thewedge assembly 24 is held outwardly far enough to ease the entrance of thefirst cable 36 into thecircular passage 80 of thewedge assembly 24. The tip of thefirst cable 36 may be sized to ensure that it slides easily into thewedge assembly 24. - Referring now to
FIG. 6 , thefirst cable 36 is pushed further through thefirst passageway 18 and pushes theplug 66 through thewedge assembly 24 until thefirst end 38 of thefirst cable 36 has been pushed through thewedge assembly 24 and extends out past thefirst end 14 of thefirst passageway 18. Theteeth 82 of thewedge assembly 24 are oriented to allow theplug 66 and thefirst cable 36 to slide from thesecond end 16 to thefirst end 14 of thefirst passageway 18, but to grip and hold thefirst cable 36 fast as it is placed under tension and tends to slide toward thesecond end 16 of thefirst passageway 18. Again, thesecond cable 48 can be inserted in the same way either before or after the insertion of thefirst cable 36. - The user can tighten the first and
second cables first cable 36, theclip 22 maintains thewedge assembly 24 in position generally in the taperedportion 62 as thefirst cable 36 is inserted through thewedge assembly 24 and theplug 66 is pushed out. After thefirst cable 36 has been pulled through the body and the cable has been tensioned, thewedge assembly 24 has been pulled into the taperedportion 62. Thering 96 is preferably resilient enough so as not to interfere with the motion of the wedge pieces into the taperedportion 62 such that thering 96 does not interfere with the stressing of thefirst cable 24. - At this point a tensioner is generally employed to pull the
first cable 36 through theanchor 10. When a predetermined tension has been reached and thefirst cable 36 has been stretched a predetermined distance, the tensioner releases thefirst cable 36. Referring now toFIG. 7 , after thefirst cable 36 is released, the tension is distributed over both thefirst cable 36 and thesecond cable 48, and thecables body 12 in directions A3, A4. Theteeth 82 of thewedge assemblies second cables cables wedge assemblies body 12 until they engage their respective taperedportions wedge assemblies portion wedges assemblies portions second cables cables - The tension in the
first cable 36 creates a force F1 along the first axis A1 and the tension in thesecond cable 48 creates a force F2 along the second axis A2. Because the first axis A1 and the second axis A2 are generally aligned, the force F1 and the force F2 are opposite one another. This may serve to minimize any torque that would be created if the forces F1 and F2 were skew. Accordingly, thecable coupler 10 does not twist or twists only at a minimum, and thecables passageways - In accordance with the disclosed example, the
clip 22 holding thewedge pieces first cable 36 through thefirst passageway 18 with perhaps less manipulation of thewedge pieces wedge pieces portion 62 after thecable 36 is placed in thefirst passageway 18, as in the prior art. The disclosed example further alleviates the problem associated with dark working conditions of a mine passage in which the small wedges may become lost. The manufacturer may find the disclosed example lessens or eliminates the need to include extra wedge pieces. As can be understood, the present design may be faster and easier to use relative to the prior art. - Referring now to
FIG. 5 , thewedge assembly 24 can be installed in the taperedportion 62 as follows. Theplug 66 is positioned between theindividual wedge pieces wedge assembly 24, and thering 96 is positioned into thegroove 84 formed adjacent the ends of thewedge pieces FIG. 5 , the retaining clip 22 (as well as the retainingclip 22 at the left of the Fig.) may be pivoted to an open position by pivoting the retainingclip 22 in the direction B about an axis C (extending into the plane of the Figure) formed by therecesses 88. In the open position, such as is shown to the right ofFIG. 5 , acentral portion 23 of theclip 22 is moved away from the opening of the tapered portion, such that the tapered portion is unobstructed by theclip 22. In the open position, awedge assembly 24, plug, and ring, assembled as discussed above, may be freely inserted into the corresponding tapered portion of the corresponding passageway. Thewedge pieces plug 66, held together by thering 96, may then be inserted as a single unit into the taperedportion 62 of the passageway. - Once the wedge assembly, the plug, and the ring are inserted into the tapered portion as discussed above, the
clip 22 may be shifted to a closed position, such as is shown to the left ofFIG. 5 . Theclip 22 may pivot in the direction D about the axis C (the axis C extends into the plane of the Figure). In the closed position, thecentral portion 23 of theclip 22 is positioned to obstruct a portion of the passageway, such that thewedge assembly 24 disposed in the tapered portion is retained in the passage by theclip 22. - Referring now to
FIG. 8 , another exemplary embodiment for the retainer is shown. In the example ofFIG. 8 , aretainer 290 takes the form of a U-shaped pin having a pair ofprongs 291 and across member 292. In the example ofFIG. 8 , the body 126 takes the form of atruss shoe 126A (shown inFIG. 10 ). Thetruss shoe 126A may be used in the roof truss ofFIG. 1 in place of thering eye plates body 12 of thecable coupler 10 discussed above. The body 126 includes a pair ofapertures 293 that extend into abore 140 having a tapered portion similar to the tapered portion discussed above. The spacing between thepins 291 is sufficient to permit theplug 185 to pass into therecess 127. However, as with the retainer 190 discussed above, theretainer 290 prevents the individual wedge pieces of thewedge assembly 146 from exiting thebore 140 into therecess 127. - Referring now to
FIG. 9 , yet another exemplary embodiment for the retainer is shown, again in a truss shoe. In the example ofFIG. 9 , aretainer 390 takes the form of adisc 391 having anannular flange 392. Theretainer 390 ofFIG. 26 may generally resemble a bottle-top shape, and may include acentral aperture 393 surrounded by anouter portion 394. In the example ofFIG. 9 , the body 126 again is in the form of a truss shoe, but alternatively may be the same or similar to thebody 12 of thecable coupler 10 discussed above. As shown, theretainer 390 is disposed in thebore 140 of the truss shoe, such that theouter portion 394 blocks a portion of thebore 140. Thecentral aperture 393 is preferably sized to permit theplug 185 of the wedge assembly 146 (both of which are discussed above in greater detail and are shown in the earlier-described Figs.) to pass through theaperture 393. When oriented as shown, theflange 392 extends outwardly away from the bore and toward therecess 127. Alternatively, theretainer 390 may be oriented so that theflange 392 extends inwardly into thebore 140. Theretainer 390 may be constructed from a rigid material or from a deformable material, such as metal, certain plastics, etc. Other materials may prove suitable. As with theretainers 190 and 290 discussed above with respect to the previously-discussed examples, theretainer 390 is positioned to retain the individual wedge pieces of thewedge assembly 146 in thebore 140, while permitting theplug 185 to be dislodged in a manner similar to that described above. Theretainer 390 preferably is maintained in thebore 140 by an interference fit between theflange 392 and the inner surface of thebore 140. - The foregoing description is not intended to limit the scope of the invention to the precise form disclosed. It is contemplated that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (5)
1-16. (canceled)
17. A cable coupler comprising:
a body having a first end, a second end, and first and second passageways extending between the first end and the second end, each passageway sized and shaped to receive a cable, each passageway including a tapered portion, the tapered portion of the first passageway and the tapered portion of the second passageway disposed at opposite ends of the body;
a first wedge assembly disposed in the tapered portion of the first passageway and a second wedge assembly disposed in the tapered portion of the second passageway, the first and second wedge assemblies arranged to secure a cable to the body from opposite directions;
a retainer arranged for placement adjacent the first end of the body, the retainer operatively coupled to a pair of cooperating recesses in the body;
wherein the retainer includes a portion sized and positioned to obstruct a portion of the first passageway thereby preventing the first wedge assembly from exiting the first passageway; and
wherein the portion of the retainer is adapted for movement to a position in which the portion of the first passageway is not obstructed.
18. A cable coupler comprising:
a body having a first end, a second end, and first and second passageways extending between the first end and the second end, each passageway sized and shaped to receive a cable, each passageway including a tapered portion, the tapered portion of the first passageway and the tapered portion of the second passageway disposed at opposite ends of the body;
a first wedge assembly disposed in the tapered portion of the first passageway and a second wedge assembly disposed in the tapered portion of the second passageway, the first and second wedge assemblies arranged to secure a cable to the body from opposite directions;
a removable retainer arranged for placement adjacent the first end of the body; and
the retainer including a portion extending into the body, the retainer further sized and positioned to obstruct a portion of the first passageway thereby preventing the first wedge assembly from exiting the first passageway.
19. A body for joining a cable to a mine roof truss component, the body comprising:
a first end, a second end, and first and second passageways, at least the first passageway sized and shaped to receive a cable and including a tapered portion;
a wedge assembly disposed in the tapered portion of the first passageway, the wedge assembly arranged to secure a cable to the body within the tapered portion of the first passageway; and
a retainer arranged for placement adjacent the first end of the body, the retainer comprising a central portion and a pair of lateral portions, the retainer operatively coupled to the body via a pair of apertures in the body, the retainer arranged for placement in a position to obstruct a portion of the passageway thereby preventing the wedge assembly from exiting the first passageway.
20. A body for joining a cable to a mine roof truss component, the body comprising:
a first end, a second end, and first and second passageways, at least the first passageway including a tapered portion sized and shaped to receive a cable;
a first wedge assembly disposed in the tapered portion of the first passageway, the first wedge assembly comprising at least two wedge pieces and arranged to secure a cable to the body;
a retainer arranged for placement adjacent the first end of the body, the retainer having a first portion operatively extending into a pair of cooperating recesses or apertures in the body;
wherein the retainer has a second portion movable into a first position to obstruct at least a portion of the first passageway, thereby preventing the first wedge assembly from exiting the first passageway; and
wherein the second portion of the retainer is movable into a second position in which the portion of the first passageway is not obstructed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/632,355 US20100080649A1 (en) | 2003-12-02 | 2009-12-07 | Cable Coupler Having Retained Wedges |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/725,895 US7118310B2 (en) | 2003-12-02 | 2003-12-02 | Truss shoe for a mine roof and method |
US61037004P | 2004-09-16 | 2004-09-16 | |
US11/224,492 US7384216B2 (en) | 2004-09-16 | 2005-09-12 | Cable coupler having retained wedges |
US11/548,170 US7717650B2 (en) | 2003-12-02 | 2006-10-10 | Roof truss shoe having wedge retention device and method of using the same |
US12/135,907 US7690868B2 (en) | 2003-12-02 | 2008-06-09 | Cable coupler having retained wedges |
US12/632,355 US20100080649A1 (en) | 2003-12-02 | 2009-12-07 | Cable Coupler Having Retained Wedges |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/135,907 Continuation US7690868B2 (en) | 2003-12-02 | 2008-06-09 | Cable coupler having retained wedges |
Publications (1)
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US20100080649A1 true US20100080649A1 (en) | 2010-04-01 |
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US12/135,907 Expired - Fee Related US7690868B2 (en) | 2003-12-02 | 2008-06-09 | Cable coupler having retained wedges |
US12/632,355 Abandoned US20100080649A1 (en) | 2003-12-02 | 2009-12-07 | Cable Coupler Having Retained Wedges |
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Application Number | Title | Priority Date | Filing Date |
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US12/135,907 Expired - Fee Related US7690868B2 (en) | 2003-12-02 | 2008-06-09 | Cable coupler having retained wedges |
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US (2) | US7690868B2 (en) |
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US20130034386A1 (en) * | 2010-04-01 | 2013-02-07 | William James Ekins | Duct grip anchor system |
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US7261494B2 (en) | 2004-02-27 | 2007-08-28 | Jennmar Corporation | Truss shoe |
US6884005B1 (en) | 2004-06-18 | 2005-04-26 | Ben L. Seegmiller | Roof support truss |
US7066688B2 (en) | 2004-08-17 | 2006-06-27 | Dywidag-Systems International Usa | Wedge barrel for a twin cable mine roof bolt |
-
2008
- 2008-06-09 US US12/135,907 patent/US7690868B2/en not_active Expired - Fee Related
-
2009
- 2009-12-07 US US12/632,355 patent/US20100080649A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1501138A (en) * | 1923-10-05 | 1924-07-15 | Horace M Rounds | Line coupling |
US1815165A (en) * | 1929-10-30 | 1931-07-21 | Sparks Withington Co | Control knob for condensers |
US1880356A (en) * | 1931-03-02 | 1932-10-04 | Edward C Noble | Coupling |
US2174624A (en) * | 1938-12-02 | 1939-10-03 | Eureka Metal Products Corp Of | Cable clamp |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130034386A1 (en) * | 2010-04-01 | 2013-02-07 | William James Ekins | Duct grip anchor system |
US9303723B2 (en) * | 2010-04-01 | 2016-04-05 | William James Ekins | Duct grip anchor system |
Also Published As
Publication number | Publication date |
---|---|
US20090022544A1 (en) | 2009-01-22 |
US7690868B2 (en) | 2010-04-06 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: DSI GROUND SUPPORT INC.,UTAH Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WALLSTEIN, ALEXANDER I.;RESCHKE, TONY;WALKER, ROLAND;SIGNING DATES FROM 20080829 TO 20080911;REEL/FRAME:023713/0558 |
|
AS | Assignment |
Owner name: DSI UNDERGROUND SYSTEMS, INC.,WEST VIRGINIA Free format text: MERGER;ASSIGNOR:DSI GROUND SUPPORT INC.;REEL/FRAME:024296/0721 Effective date: 20091222 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |