US20230383780A1 - Snap nut concrete anchor assembly - Google Patents
Snap nut concrete anchor assembly Download PDFInfo
- Publication number
- US20230383780A1 US20230383780A1 US18/447,825 US202318447825A US2023383780A1 US 20230383780 A1 US20230383780 A1 US 20230383780A1 US 202318447825 A US202318447825 A US 202318447825A US 2023383780 A1 US2023383780 A1 US 2023383780A1
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- United States
- Prior art keywords
- support member
- outer housing
- jaws
- jaw assembly
- threaded
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- 239000004567 concrete Substances 0.000 title description 19
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 239000000758 substrate Substances 0.000 description 11
- 238000009434 installation Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 238000009415 formwork Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004308 accommodation Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000007787 solid 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
- F16B13/12—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like
- F16B13/124—Separate metal or non-separate or non-metal dowel sleeves fastened by inserting the screw, nail or the like fastened by inserting a threaded element, e.g. screw or bolt
-
- 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
- F16B37/00—Nuts or like thread-engaging members
- F16B37/08—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut
- F16B37/0807—Nuts engaged from the end of the bolt, e.g. axially slidable nuts
- F16B37/0857—Nuts engaged from the end of the bolt, e.g. axially slidable nuts with the threaded portions of the nut engaging the thread of the bolt by the action of one or more springs or resilient retaining members
Definitions
- the present invention relates to anchors for use in concrete substrates.
- the general concept disclosed herein could be used in any application in which a threaded male shaft is to be secured in a threaded female receptacle to another the shaft or the receptacle.
- Concrete structures are typically formed from concrete substrates, being either the type made off site (commonly known as pre-cast concrete substrates) or the type made on site (commonly known as cast in place (CIP) concrete substrates). Both types of concrete substrates may be reinforced with metal of other suitable materials depending on their intended application. It is often necessary to attach fixtures and fittings to concrete substrates, the nature of which might vary according to the type of structure. For instance, many buildings have floors or walls made from concrete panels from which ducts or other items may be suspended, bridges may include concrete portions from which signage and other items must be hung, and so on. This often requires an anchor to be secured to or within the concrete substrate such that the fixtures and fittings can be mechanically fastened to the anchor.
- the anchors of interest here are those which are installed during production of the substrate, rather than those retrofitted to the concrete substrate after production.
- the general process for installing these anchors includes the steps of setting out a form board, mounting the anchor in the desired position on the form board, securing the anchor to the form board, pouring concrete over the form board and the anchor, removing the form board from the set concrete so as to reveal at least a portion of the anchor adjacent the now removed form board.
- the revealed portion of the anchor may expose a receptacle into which a threaded rod may be received and secured.
- these anchors comprise an anchor point accessible from the underside of the concrete substrate and which typically take the form of a threaded bore into which a bolt or threaded shaft can be fastened.
- threaded bore anchor structure which a threaded bore includes at least two separable threaded parts or portions. The parts are able to be forced apart radially from a central longitudinal axis of the rod or bolt and then are biased back together so that interior female threads of the bore portions complementarily engage the external male threads of the rod or bolt.
- U.S. Pat. Nos. 4,368,606 and 5,468,105 teach the biased split nut concept embodied in an anchor that is attachable to formwork (e.g., wooden formwork).
- U.S. Pat. No. 4,007,563 discloses an anchor for setting in metal decking. The present application also contemplates replacement of the female thread receptacle disclosed therein with the snap locking system described below. All three patents are incorporated by reference herein in their entirety.
- split nut designs provide a certain flexibility with axial installation and even accommodation of multiple thread sizes, this structure can also present some reliability challenges. Specifically, mating between the threads of the rod and nut portions is important, so it is best when the alignment of the separate bore portions is maintained and it would be preferred if the user could have assurances that proper alignment of the portions and complete collapse of portions onto the rod or bolt has occurred. Furthermore, assurances that a user has inserted a rod or bolt a sufficient distance into the anchor is beneficial.
- a base member connectable to a support member to form an anchor assembly mountable to a form board or metal decking on which wet concrete may be poured during formation of a concrete substrate
- the base member includes a mounting portion for mounting the anchor assembly to the form board.
- the base member may also include a main guide having first and second generally opposed ends, the first end being open to facilitate insertion of the support member into the main guide.
- the main guide may also including a generally tubular body upstanding from the mounting portion. The tubular body may have an internal cross-section sized and shaped to correspond closely with the cross-section of the support member so as to create a snug fit between the main guide and the support member.
- the base member includes at least one reinforcement member to improve the rigidity and or strength of the main guide.
- the reinforcement member may comprise at least one web arranged between the main guide and the mounting portion and preferably spaced equidistantly around the main guide.
- One type of reinforcement member may include at least one rib arranged axially and projecting inwardly.
- the at least one rib may add increased stiffness and lateral support between the main guide and the support member to resist inadvertent deformation and/or disassembly of those parts.
- the plurality of ribs circumferentially spaced around the main guide and each disposed between two neighboring channels.
- a cast in place anchor assembly comprising a base member as described above and a support member located in the main guide of the base member.
- the support member may include attachment means accessible through the second end of the main guide.
- the support member may comprise a shank having opposed first and second ends.
- the support member includes an outer housing, the outer housing being defined by a longitudinal axis, the outer housing including a wall, the outer housing also including a connector opening at a first end thereof for receiving the threaded shaft/shank, the outer housing further including an assembly opening at a second end opposite the first end thereof, the housing wall including an inner surface defining a inner space.
- the support member further includes a jaw assembly disposed in the inner space, the jaw assembly including at least one threaded jaw the threads of which selectively engage threads of the shaft, the jaw assembly further including a bias member for biasing the at least one thread jaw toward the longitudinal axis.
- a holding member is provided that prevents the bias member from moving the at least one threaded jaw toward the longitudinal axis.
- the jaw assembly may take two different configurations.
- the holding member prevents the at least one threaded jaw from moving toward the central longitudinal axis.
- the threaded shaft is inserted into the connector opening, to contact the holding member to release the at least one threaded jaw to move toward the central longitudinal axis and into biased contact with the threaded shaft to define a second jaw assembly configuration.
- FIG. 1 A is a first perspective view of an anchor assembly of the present invention
- FIG. 1 B is a side perspective cutaway view of the anchor assembly of FIG. 1 in a pre-snap configuration receiving a threaded shaft;
- FIG. 1 C is a side perspective cutaway view of the anchor assembly of FIG. 1 in a post-snap configuration
- FIG. 1 D is a side cross-sectional view of the anchor assembly of FIG. 1 in a pre-snap configuration with a separable support member;
- FIG. 2 A is top perspective view of the jaw assembly of FIG. 1 B in a first pre-snap configuration
- FIG. 2 B is top perspective view of the jaw assembly of FIG. 1 B in a first pre-snap configuration with the resilient member and upper guide removed;
- FIG. 2 C is top perspective view of the jaw assembly of FIG. 1 B in a second post-snap configuration
- FIG. 3 is an exploded perspective view of the individual elements of the jaw assembly of FIG. 1 B .
- FIG. 4 are top views and top perspective views of the support member of FIG. 1 B including a portion of the jaw assembly of FIG. 1 B .
- FIGS. 5 A and 5 B are side cross-sectional views of the support member of FIG. 1 B in the pre-snap configuration.
- FIGS. 6 A and 6 B are side cross-sectional views of the support member of FIG. 1 B in the post-snap configuration.
- FIG. 7 A is a side perspective cutaway view of a second embodiment of the present invention.
- FIG. 7 B is an exploded view of the jaw assembly of FIG. 7 A of the present invention.
- FIG. 7 C are top views and top perspective views of the support member of FIG. 1 B including a portion of the jaw assembly of FIG. 1 B .
- FIGS. 1 A and 1 B show an embodiment of an anchor assembly of the present invention, which is generally indicated as 100 .
- Anchor assembly 100 includes a support member 210 to be supported within a base member 150 .
- FIG. 1 B shows a threaded shaft 50 which may be inserted into anchor assembly 100 in a direction D.
- Base member 150 may be mounted to a form board (not shown) for defining a perimeter of a poured concrete structure.
- Base member 150 may include a form engagement support 154 and a raised main guide 158 for receiving and positioning support member 210 relative to the form after assembly.
- Raised main guide 158 may be further reinforced by ribs or structural aids 160 that hold raised main guide 158 securely relative to base member 150 .
- Structural aids may come in various forms and may include channels 164 through which fasteners (e.g., nails) pass and then enter the form for securing anchor assembly 100 to the form. Also shown in FIGS. 1 A and 1 B is a plug or cover 260 to be discussed in more detail below.
- fasteners e.g., nails
- FIGS. 1 B- 1 D show perspectives cross-sectional view of the support member 210 of FIG. 1 A .
- FIG. 1 B has an axis A-A.
- Support member 210 includes an outer housing 230 and a jaw assembly 250 .
- Outer housing 230 includes side walls 232 and a flange 238 which extends radially outward from side wall 232 .
- An underside of flange 238 provides a bearing surface for resisting pull out of support member 210 from the concrete.
- Plug 260 may serve as a cover that locks (e.g., threadably) into flange 238 for access to an interior of support member 210 .
- Side wall 232 includes and inner surface 240 that defines an inner space 244 .
- side wall 232 may also include upper and lower portions 233 and 234 respectively. Furthermore, upper portion 233 and lower portion 234 may connect at respective female and male threads 235 and 236 .
- Inner surface 240 may also include an incline surface portion 237 that narrows in diameter toward an insertion end 212 of support member 210 .
- jaw assembly 250 When assembled, jaw assembly 250 is located within inner space 244 as shown in FIGS. 1 B & 1 C .
- FIGS. 2 A- 2 C show jaw assembly 250 assembled outside of support member 210 .
- FIG. 3 shows individual elements of Jaw assembly 250 in perspective.
- Jaw assembly 250 includes a first jaw 300 A and second jaw 300 B.
- Each of jaws 300 A and 300 B include interior threads 302 , inclined surfaces 304 , biasing notches 306 and alignment holes 308 .
- Jaws 300 A and 300 B are assembled into a generally cylindrical arrangement as shown in FIGS. 2 A- 2 C .
- a resilient bias member 310 surrounds jaws 300 A, 300 B and bias jaws 300 A, 300 B toward central axis A-A. Openings 308 simultaneously receive an alignment pin 320 .
- Alignment pin 320 links jaws 300 A, 300 B to limit the relative movement (e.g., relative axial movement) between jaw 300 A and jaw 300 B during operation.
- Jaw assembly 250 also includes a holding member 340 .
- Holding member 340 can assume at least two positions within jaw assembly 250 (discussed in further detail below).
- Holding member 340 includes a bottom surface 342 , lower members 343 , resilient legs 344 , and a spring guide 346 .
- Lower member 343 of holding member 340 extends at a bottom of holding member 340 to surround or trap pin 320 within holding member 340 .
- a resilient member 350 is disposed in inner space 244 between cover 260 of outer housing 230 and holding member 340 to bias holding member 340 downward toward and against or around alignment pin 320 .
- An upper guide 360 is also disposed in inner space 244 between outer housing 230 and holding members 340 .
- Upper guide 360 includes an inner wall 362 that defines an opening 364 . Opening 364 serves as a means of accommodating and confining or guiding resilient member 350 radially such that inner wall 362 restricts radial movement of holding member 340 .
- FIG. 4 shows an anti-rotational feature of the present invention.
- FIG. 4 A shows a perspective view of jaws 300 A and 300 B assembled together with alignment pin 320 passing through alignment holes 308 .
- Alignment pin 320 extends past a radial extent of jaws 300 A and 300 B.
- Side wall 232 includes an axially extending slots 370 .
- a portion of jaw assembly 250 is inserted into inner space 244 .
- cantilevered portions of alignment pin 320 extend into slots 370 so that alignment pin 320 cannot rotate relative support member 210 .
- jaws 300 A and 300 B are also unable to rotate relative to alignment pin 320
- jaws 300 A, 300 B are also unable to rotate relative to support member 210 .
- Alignment pin 320 therefore limits and/or resists relative axial misalignment of jaws 300 A and 300 B as well as limits and/or resists rotation (R, see FIG. 4 ) of jaws 300 A, 300 B relative to support member 210 in a plane through pin 320 and through central longitudinal axis A-A or about an axis perpendicular to both A-A and a longitudinal axis of alignment pin 320 . Said another way, alignment pin 320 limits rotational R misalignment of jaws 300 A, 300 B relative to central axis A-A. Such limits allow rotation, but maintain jaws 300 A, 300 B generally symmetrical relative to central axis A-A.
- FIGS. 1 B, 1 D, 2 A, 2 B, 5 A and 5 B each show jaw assembly 250 in a first pre-snap configuration.
- FIGS. 1 C, 2 C, 6 A, and 6 B each show jaw assembly 250 in a second post-snap configuration.
- FIGS. 5 A and 5 B show jaw assembly 250 in the pre-snap configuration with a bottom 342 of holding member 340 still positioned below a bottom surface 309 of slot 307 .
- FIGS. 6 A and 6 B show jaw assembly 250 in the post-snap configuration with a bottom 342 of holding member 340 above or clearing a bottom surface 309 of slot 307 .
- jaw assembly 250 can take two configurations.
- a user desires to secure a threaded rod 50 to and in a jaw assembly 250 disposed in a support member 210 that has been encased in cured concrete.
- support member 210 is secured in a ceiling slab so that an end 212 of holding member 210 is at a lower edge of the ceiling slab exposing access opening 214 .
- a user may then, for example, look up from a lower floor, extend the threaded rod 50 into access opening 214 , and secure the rod to jaw assembly 250 in the following manner.
- FIGS. 1 B, 1 D, 2 B, 2 C, 5 A and 5 B which display the pre-snap configuration
- radial biasing member 310 biases each jaw 300 A, 300 B toward central axis A-A.
- holding member 340 is located between and separates or stops jaws 300 A and 300 B against a biasing force of biasing member 310 .
- holding member 340 is disposed between jaws 300 A, 300 B so that bias member 310 biases jaws 300 A and 300 B against holding member 340 .
- FIGS. 2 A & 2 B also show the notch 307 in an upper portion of each of jaws 300 A and 300 B.
- each notch 307 includes a bottom surface 309 .
- a portion of holding member 340 extends below bottom surface 309 and is therefore, in the pre-snap configuration, is positioned between jaws 300 A and 300 B.
- longitudinal biasing member 350 forces holding member 340 downward and in contact with alignment pin 320 . Specifically holding member 340 is forced by longitudinal biasing member 350 so that resilient legs 344 remain extended around alignment pin 320 . Side walls 362 of upper guide 360 surround and are generally adjacent to bias member 350 and holding member 340 and so keep them aligned during any axial movement.
- rod 50 is extended into inner space 244 until it engages lower member 343 of holding member 340 .
- jaws 300 A, 300 B are kept in alignment (e.g., axial) by alignment pin 320 .
- alignment pin permits, but limits relative axial miss alignment between jaws 300 A and 300 B.
- the user then continues to insert rod 50 by pushing holding member 340 upward in direction D away from and relative to jaws 300 A, 300 B and against the biasing force of longitudinal resilient member 350 . Also overcome by the pushing force is the friction between holding member 340 and jaws 300 A and 300 B generated by bias member 310 .
- Lower member 343 may also limit any upward movement of holding member 340 as rod 50 moves holding member 340 upward relative to jaws 300 A and 300 B.
- Resilient legs 344 which initially surround alignment pin 320 now flex outward to release alignment pin 320 and then back inward as holding member 340 is pushed away from alignment pin 320 . While resilient legs 344 are flexible, they possess sufficient strength such that a significant and noticeable rod 50 force must be exerted on holding member 340 by rod 50 of a user to overcome alignment pin 320 /holding member 340 locking forces.
- At least a biasing force of legs 344 , a frictional force between holding member 340 and jaws 300 A and 300 B, and a biasing force of biasing member 350 must be overcome to suddenly release alignment pin 320 from the lock of legs 344 .
- holding member 340 When holding member 340 is pushed up sufficiently so that bottom surface 342 of holding member 340 is above bottom surface 309 of notch 307 , holding member 340 has cleared jaws 300 A and 300 B and resilient member 310 suddenly biases internal threads 302 of jaws 300 A, 300 B together until internal threads 302 engage external threads of rod 50 with a sudden impact.
- alignment pin 320 minimizes or limits the possible misalignment (e.g., axial) of jaws 300 A, 300 B so that internal threads on both jaw 300 A and jaw 300 B effectively engage external jaws of rod
- holding member 340 is then accommodated in notch 307 as shown best in FIG. 2 B .
- FIGS. 2 C, 6 A and 6 B show the configuration of jaw assembly 250 in the post-snap configuration.
- jaws 300 A and 300 B prevent axial removal of rod 50 from support member 210 except by rotation.
- FIG. 5 A shows rod engaging holding member 340 pre-snap
- FIG. 6 A shows rod 50 secured in jaws 300 A, 300 B post-snap.
- inclined surface 304 of jaws 300 A, 300 B engages inclined surface 237 of inner space 244 .
- jaws 300 A and 300 B do not engage rod 50 until threaded rod 50 is inserted completely into the threads promotes a maximum thread engagement in the post-snap configuration.
- the present invention which triggers engagement only if at least a minimum predetermined rod insertion length is achieved lessens the possibility of an inadequate thread engagement during installation.
- a sudden impact of jaws 300 A and 300 B on rod 50 transfers energy to and along rod 50 to a hand of an installer to indicate to the installer that jaws 300 A and 300 B have engaged and rod 50 has been inserted sufficiently into opening 214 .
- the sudden release of legs 344 can be an indication to an installer that a minimum insertion length has been achieved.
- the snap-nut assembly described above may be utilized in any anchoring system in which it is desired to axially secure a shaft such as a threaded shaft to a support structure. Therefore, the snap-nut assemblies disclosed herein may be integrated into various anchoring or connection systems including metal deck anchoring systems such as described in U.S. Pat. No. 4,007,563 to Nakagawa and which is incorporate herein by reference in its entirety.
- FIG. 7 A- 7 C show an alternate embodiment of the anchor assembly of FIGS. 1 A and 1 B .
- the anchor assembly is generally shown at 700 and is similarly to anchor assembly 100 as it also includes adjustable position locking threaded jaws.
- Anchor assembly 700 includes a support member 710 .
- Support member 710 includes a flange 738 at an upper end or assembly end.
- Support member 710 also includes a lower end or insertion end 712 with an insertion opening 714 , and an inner space 744 for receiving a jaw assembly 750 .
- Flange 738 includes a central cover 760 that defines an upper flange end of inner space 744 .
- Cover 760 is removable and lockable (e.g., with threads) to offer access to inner space 744 for assembly.
- Inner space 744 includes an inward facing inclined surface 737 .
- Inclined surface 737 slants downward from flange 738 toward a central longitudinal axis A-A of anchor assembly 700 .
- Jaw assembly 750 includes jaws 700 A and 700 B. Jaws 700 A and 700 B each include inner threads 702 , a radially inward inclined outer surface 704 , and an alignment passage 708 . Jaw assembly 750 also includes an alignment pin 720 , an alignment stop 740 , and a biasing member 755 .
- Biasing member 755 may be any resilient object such as a coil, leaf or wave spring that compresses to generate a continuous reactive biasing force.
- Biasing member 755 could also be a resilient solid member such as a piece of rubber (e.g., tube shaped).
- Alignment stop 740 includes a bottom surface 742 , an opening or passage 745 that could be a through passage, and a sidewall 746 .
- jaws 700 A and 700 B are positioned in inner space 744 such that outer surface 704 complementarily engages inclined surface 737 .
- Alignment pin 720 passes through openings 708 in jaws 700 A and 700 B and through stop 740 .
- Biasing member 755 is compressed between cover 780 and a top of each jaw 700 A and 700 B. The compressed biasing member 755 reacts to, forces, or urge jaws 700 A and 700 B longitudinally toward insertion end 712 . Because the inclined surfaces 737 are slanted or inclined inward, biasing member 755 ultimately also urges jaws 700 A and 700 B radially inward toward central longitudinal axis A-A.
- Alignment pin 720 passes through stop 740 which at least in part serves to stabilize pin 720 .
- the arrangement of pin 720 relative to stop 740 avoids any direct contact between rod 50 and pin 720 .
- Alignment pin 740 also passes through jaws 700 A and 700 B such that alignment pin 720 limits any possible axial misalignment between jaws 700 A and 700 B.
- Alignment pin 720 may also be sized in openings 708 of jaws 700 A and 700 B to allow jaws 700 A and 700 B a limited freedom to pivot during insertion of rod 50 in order to most effectively accommodate rod 50 .
- Rod 50 urges jaws 700 A and 700 B radially toward an assembly end and axially apart against the biasing force of biasing member 755 .
- Rod 50 is inserted into support member 710 until an end of rod 50 engages a bottom 742 of stop 740 .
- Bias member 775 continuously biases jaws 700 A, 700 B toward central axis A-A until rod 50 contacts a bottom 742 of alignment stop 740 .
- Rod 50 can then no longer be axially removed from support member 710 , but can only be removed from support member 710 by thread rotation.
- the present invention disclosure may include written description and drawings that describe features in one embodiment that are not disclosed in another embodiment.
- the present invention contemplates interchanging such features.
Abstract
The present disclosure describes an anchor device for receiving and securing a shaft thereto. The device includes an outer housing within which a jaw assembly is secured. The outer housing of the device may in turn be secured to or within a support structure such as a building component. Jaw components of the jaw assembly may be threaded. Furthermore, the jaw assembly has at least two configurations. In a first configuration, at least one jaw component is positioned away from a central shaft axis against the biasing force of a biasing member. A removable or reconfigurable holding member or stop member selectively secures the at least one jaw component in this position. A second configuration is the result of the holding member being reconfigured by the inserted shaft. The shaft triggers movement of the at least one jaw component toward the central shaft axis and into contact with the shaft.
Description
- This is a continuation application of US non-provisional application US non-provisional application U.S. Ser. No. 17/173,321 filed Feb. 11, 2021, which is a continuation of US non-provisional application U.S. Ser. No. 15/923,052 filed Mar. 16, 2018 and the disclosure of which is incorporated herein by reference in its entirety.
- The present invention relates to anchors for use in concrete substrates. However, the general concept disclosed herein could be used in any application in which a threaded male shaft is to be secured in a threaded female receptacle to another the shaft or the receptacle.
- Concrete structures are typically formed from concrete substrates, being either the type made off site (commonly known as pre-cast concrete substrates) or the type made on site (commonly known as cast in place (CIP) concrete substrates). Both types of concrete substrates may be reinforced with metal of other suitable materials depending on their intended application. It is often necessary to attach fixtures and fittings to concrete substrates, the nature of which might vary according to the type of structure. For instance, many buildings have floors or walls made from concrete panels from which ducts or other items may be suspended, bridges may include concrete portions from which signage and other items must be hung, and so on. This often requires an anchor to be secured to or within the concrete substrate such that the fixtures and fittings can be mechanically fastened to the anchor. The anchors of interest here are those which are installed during production of the substrate, rather than those retrofitted to the concrete substrate after production. The general process for installing these anchors includes the steps of setting out a form board, mounting the anchor in the desired position on the form board, securing the anchor to the form board, pouring concrete over the form board and the anchor, removing the form board from the set concrete so as to reveal at least a portion of the anchor adjacent the now removed form board. The revealed portion of the anchor may expose a receptacle into which a threaded rod may be received and secured. In other words, these anchors comprise an anchor point accessible from the underside of the concrete substrate and which typically take the form of a threaded bore into which a bolt or threaded shaft can be fastened.
- Because different structural designs may require different diameter bolts or threaded shafts, numerous anchor designs have been proposed such that a single threaded bore anchor structure mentioned above is able to accommodate different sized/diameter bolts or threaded rods. Typically, such threaded bore structures embody some sort of separable split nut concept in which a threaded bore includes at least two separable threaded parts or portions. The parts are able to be forced apart radially from a central longitudinal axis of the rod or bolt and then are biased back together so that interior female threads of the bore portions complementarily engage the external male threads of the rod or bolt. Many of these designs allow a rod or bolt to be installed by simply forcing the rod or bolt axially into the bore portions spreading the bore portions apart and then allowing the bore portions to be axially biased radially back inward (e.g., by a flexible biasing member) onto the rod or bolt.
- At least U.S. Pat. Nos. 4,368,606 and 5,468,105 teach the biased split nut concept embodied in an anchor that is attachable to formwork (e.g., wooden formwork). U.S. Pat. No. 4,007,563 discloses an anchor for setting in metal decking. The present application also contemplates replacement of the female thread receptacle disclosed therein with the snap locking system described below. All three patents are incorporated by reference herein in their entirety.
- While split nut designs provide a certain flexibility with axial installation and even accommodation of multiple thread sizes, this structure can also present some reliability challenges. Specifically, mating between the threads of the rod and nut portions is important, so it is best when the alignment of the separate bore portions is maintained and it would be preferred if the user could have assurances that proper alignment of the portions and complete collapse of portions onto the rod or bolt has occurred. Furthermore, assurances that a user has inserted a rod or bolt a sufficient distance into the anchor is beneficial.
- It is therefore an object of the present invention to provide an anchor which is easy to install and whose integrity is not affected by careless installation.
- According to a first aspect of the invention, there is provided a base member connectable to a support member to form an anchor assembly mountable to a form board or metal decking on which wet concrete may be poured during formation of a concrete substrate, the base member includes a mounting portion for mounting the anchor assembly to the form board. The base member may also include a main guide having first and second generally opposed ends, the first end being open to facilitate insertion of the support member into the main guide. The main guide may also including a generally tubular body upstanding from the mounting portion. The tubular body may have an internal cross-section sized and shaped to correspond closely with the cross-section of the support member so as to create a snug fit between the main guide and the support member.
- Advantageously the base member includes at least one reinforcement member to improve the rigidity and or strength of the main guide. The reinforcement member may comprise at least one web arranged between the main guide and the mounting portion and preferably spaced equidistantly around the main guide.
- One type of reinforcement member may include at least one rib arranged axially and projecting inwardly. The at least one rib may add increased stiffness and lateral support between the main guide and the support member to resist inadvertent deformation and/or disassembly of those parts. The plurality of ribs circumferentially spaced around the main guide and each disposed between two neighboring channels.
- According to a second aspect of the invention, there is provided a cast in place anchor assembly comprising a base member as described above and a support member located in the main guide of the base member. The support member may include attachment means accessible through the second end of the main guide. For instance, the support member may comprise a shank having opposed first and second ends.
- Specifically, the support member includes an outer housing, the outer housing being defined by a longitudinal axis, the outer housing including a wall, the outer housing also including a connector opening at a first end thereof for receiving the threaded shaft/shank, the outer housing further including an assembly opening at a second end opposite the first end thereof, the housing wall including an inner surface defining a inner space.
- The support member further includes a jaw assembly disposed in the inner space, the jaw assembly including at least one threaded jaw the threads of which selectively engage threads of the shaft, the jaw assembly further including a bias member for biasing the at least one thread jaw toward the longitudinal axis. A holding member is provided that prevents the bias member from moving the at least one threaded jaw toward the longitudinal axis.
- The jaw assembly may take two different configurations. In a first jaw assembly configuration, the holding member prevents the at least one threaded jaw from moving toward the central longitudinal axis. Furthermore, in the first configuration the threaded shaft is inserted into the connector opening, to contact the holding member to release the at least one threaded jaw to move toward the central longitudinal axis and into biased contact with the threaded shaft to define a second jaw assembly configuration.
- By way of example only, embodiments of the present invention will now be described in detail, with reference being made to the accompanying drawings, in which:
-
FIG. 1A is a first perspective view of an anchor assembly of the present invention; -
FIG. 1B is a side perspective cutaway view of the anchor assembly ofFIG. 1 in a pre-snap configuration receiving a threaded shaft; -
FIG. 1C is a side perspective cutaway view of the anchor assembly ofFIG. 1 in a post-snap configuration; -
FIG. 1D is a side cross-sectional view of the anchor assembly ofFIG. 1 in a pre-snap configuration with a separable support member; -
FIG. 2A is top perspective view of the jaw assembly ofFIG. 1B in a first pre-snap configuration; -
FIG. 2B is top perspective view of the jaw assembly ofFIG. 1B in a first pre-snap configuration with the resilient member and upper guide removed; -
FIG. 2C is top perspective view of the jaw assembly ofFIG. 1B in a second post-snap configuration; -
FIG. 3 is an exploded perspective view of the individual elements of the jaw assembly ofFIG. 1B . -
FIG. 4 are top views and top perspective views of the support member ofFIG. 1B including a portion of the jaw assembly ofFIG. 1B . -
FIGS. 5A and 5B are side cross-sectional views of the support member ofFIG. 1B in the pre-snap configuration. -
FIGS. 6A and 6B are side cross-sectional views of the support member ofFIG. 1B in the post-snap configuration. -
FIG. 7A is a side perspective cutaway view of a second embodiment of the present invention; -
FIG. 7B is an exploded view of the jaw assembly ofFIG. 7A of the present invention. -
FIG. 7C are top views and top perspective views of the support member ofFIG. 1B including a portion of the jaw assembly ofFIG. 1B . -
FIGS. 1A and 1B show an embodiment of an anchor assembly of the present invention, which is generally indicated as 100.Anchor assembly 100 includes asupport member 210 to be supported within abase member 150.FIG. 1B shows a threadedshaft 50 which may be inserted intoanchor assembly 100 in a directionD. Base member 150 may be mounted to a form board (not shown) for defining a perimeter of a poured concrete structure.Base member 150 may include aform engagement support 154 and a raisedmain guide 158 for receiving andpositioning support member 210 relative to the form after assembly. Raisedmain guide 158 may be further reinforced by ribs orstructural aids 160 that hold raisedmain guide 158 securely relative tobase member 150. Structural aids may come in various forms and may includechannels 164 through which fasteners (e.g., nails) pass and then enter the form for securinganchor assembly 100 to the form. Also shown inFIGS. 1A and 1B is a plug or cover 260 to be discussed in more detail below. -
FIGS. 1B-1D show perspectives cross-sectional view of thesupport member 210 ofFIG. 1A .FIG. 1B has an axis A-A.Support member 210 includes anouter housing 230 and ajaw assembly 250.Outer housing 230 includesside walls 232 and aflange 238 which extends radially outward fromside wall 232. An underside offlange 238 provides a bearing surface for resisting pull out ofsupport member 210 from the concrete. Plug 260 may serve as a cover that locks (e.g., threadably) intoflange 238 for access to an interior ofsupport member 210.Side wall 232 includes andinner surface 240 that defines aninner space 244.FIG. 1D shows howside wall 232 may also include upper andlower portions upper portion 233 andlower portion 234 may connect at respective female andmale threads Inner surface 240 may also include anincline surface portion 237 that narrows in diameter toward aninsertion end 212 ofsupport member 210. - When assembled,
jaw assembly 250 is located withininner space 244 as shown inFIGS. 1B &1C .FIGS. 2A-2C show jaw assembly 250 assembled outside ofsupport member 210. In addition,FIG. 3 shows individual elements ofJaw assembly 250 in perspective.Jaw assembly 250 includes afirst jaw 300A andsecond jaw 300B. Each ofjaws interior threads 302,inclined surfaces 304, biasingnotches 306 and alignment holes 308.Jaws FIGS. 2A-2C . Aresilient bias member 310 surroundsjaws bias jaws Openings 308 simultaneously receive analignment pin 320.Alignment pin 320links jaws jaw 300A andjaw 300B during operation. -
Jaw assembly 250 also includes a holdingmember 340. Holdingmember 340 can assume at least two positions within jaw assembly 250 (discussed in further detail below). Holdingmember 340 includes abottom surface 342,lower members 343,resilient legs 344, and aspring guide 346.Lower member 343 of holdingmember 340 extends at a bottom of holdingmember 340 to surround ortrap pin 320 within holdingmember 340. Aresilient member 350 is disposed ininner space 244 betweencover 260 ofouter housing 230 and holdingmember 340 to bias holdingmember 340 downward toward and against or aroundalignment pin 320. Anupper guide 360 is also disposed ininner space 244 betweenouter housing 230 and holdingmembers 340.Upper guide 360 includes aninner wall 362 that defines anopening 364.Opening 364 serves as a means of accommodating and confining or guidingresilient member 350 radially such thatinner wall 362 restricts radial movement of holdingmember 340. Inturn spring guide 346 of holdingmember 340 confinesresilient member 350 to axial movement. -
FIG. 4 shows an anti-rotational feature of the present invention. Specifically,FIG. 4A shows a perspective view ofjaws alignment pin 320 passing through alignment holes 308.Alignment pin 320 extends past a radial extent ofjaws Side wall 232 includes anaxially extending slots 370. During assembly, a portion ofjaw assembly 250 is inserted intoinner space 244. As this insertion occurs cantilevered portions ofalignment pin 320 extend intoslots 370 so thatalignment pin 320 cannot rotaterelative support member 210. Sincejaws alignment pin 320,jaws member 210.Alignment pin 320 therefore limits and/or resists relative axial misalignment ofjaws FIG. 4 ) ofjaws member 210 in a plane throughpin 320 and through central longitudinal axis A-A or about an axis perpendicular to both A-A and a longitudinal axis ofalignment pin 320. Said another way,alignment pin 320 limits rotational R misalignment ofjaws jaws -
FIGS. 1B, 1D, 2A, 2B, 5A and 5B eachshow jaw assembly 250 in a first pre-snap configuration. On the other hand,FIGS. 1C, 2C, 6A, and 6B eachshow jaw assembly 250 in a second post-snap configuration.FIGS. 5A and 5B showjaw assembly 250 in the pre-snap configuration with abottom 342 of holdingmember 340 still positioned below abottom surface 309 ofslot 307.FIGS. 6A and 6B showjaw assembly 250 in the post-snap configuration with abottom 342 of holdingmember 340 above or clearing abottom surface 309 ofslot 307. - The operation of
jaw assembly 250 insupport member 210 will now be described with reference to the Figures. As mentioned above,jaw assembly 250 can take two configurations. In operation, a user desires to secure a threadedrod 50 to and in ajaw assembly 250 disposed in asupport member 210 that has been encased in cured concrete. For example,support member 210 is secured in a ceiling slab so that anend 212 of holdingmember 210 is at a lower edge of the ceiling slab exposingaccess opening 214. A user may then, for example, look up from a lower floor, extend the threadedrod 50 into access opening 214, and secure the rod tojaw assembly 250 in the following manner. - Referring to
FIGS. 1B, 1D, 2B, 2C, 5A and 5B which display the pre-snap configuration,radial biasing member 310 biases eachjaw member 340 is located between and separates or stopsjaws member 310. In other words, holdingmember 340 is disposed betweenjaws bias member 310biases jaws member 340.FIGS. 2A & 2B also show thenotch 307 in an upper portion of each ofjaws notch 307 includes abottom surface 309. A portion of holdingmember 340 extends belowbottom surface 309 and is therefore, in the pre-snap configuration, is positioned betweenjaws - Furthermore, in the pre-snap configuration,
longitudinal biasing member 350forces holding member 340 downward and in contact withalignment pin 320. Specifically holdingmember 340 is forced by longitudinal biasingmember 350 so thatresilient legs 344 remain extended aroundalignment pin 320.Side walls 362 ofupper guide 360 surround and are generally adjacent tobias member 350 and holdingmember 340 and so keep them aligned during any axial movement. - During rod installation,
rod 50 is extended intoinner space 244 until it engageslower member 343 of holdingmember 340. Asrod 50 passes throughjaws jaws alignment pin 320. In other words, alignment pin permits, but limits relative axial miss alignment betweenjaws rod 50 by pushing holdingmember 340 upward in direction D away from and relative tojaws resilient member 350. Also overcome by the pushing force is the friction between holdingmember 340 andjaws bias member 310.Lower member 343 may also limit any upward movement of holdingmember 340 asrod 50moves holding member 340 upward relative tojaws Resilient legs 344 which initially surroundalignment pin 320 now flex outward to releasealignment pin 320 and then back inward as holdingmember 340 is pushed away fromalignment pin 320. Whileresilient legs 344 are flexible, they possess sufficient strength such that a significant andnoticeable rod 50 force must be exerted on holdingmember 340 byrod 50 of a user to overcomealignment pin 320/holdingmember 340 locking forces. Specifically, at least a biasing force oflegs 344, a frictional force between holdingmember 340 andjaws member 350 must be overcome to suddenly releasealignment pin 320 from the lock oflegs 344. - When holding
member 340 is pushed up sufficiently so thatbottom surface 342 of holdingmember 340 is abovebottom surface 309 ofnotch 307, holdingmember 340 has clearedjaws resilient member 310 suddenly biasesinternal threads 302 ofjaws internal threads 302 engage external threads ofrod 50 with a sudden impact. Again,alignment pin 320 minimizes or limits the possible misalignment (e.g., axial) ofjaws jaw 300A andjaw 300B effectively engage external jaws of rod After snapping, holdingmember 340 is then accommodated innotch 307 as shown best inFIG. 2B . -
FIGS. 2C, 6A and 6B show the configuration ofjaw assembly 250 in the post-snap configuration. Afterholder 340 is displace from betweenjaws jaws rod 50,jaws rod 50 fromsupport member 210 except by rotation.FIG. 5A shows rod engaging holdingmember 340 pre-snap andFIG. 6A showsrod 50 secured injaws rod 50 is loaded in a direction opposite direction D,inclined surface 304 ofjaws surface 237 ofinner space 244. The result of the interaction of these inclined surfaces is that a downward loading ofrod 50 in a direction opposite D results in a force onjaws jaws rod 50. - The fact that
jaws rod 50 until threadedrod 50 is inserted completely into the threads promotes a maximum thread engagement in the post-snap configuration. In other words, the present invention which triggers engagement only if at least a minimum predetermined rod insertion length is achieved lessens the possibility of an inadequate thread engagement during installation. Furthermore, a sudden impact ofjaws rod 50 transfers energy to and alongrod 50 to a hand of an installer to indicate to the installer thatjaws rod 50 has been inserted sufficiently intoopening 214. Furthermore, the sudden release oflegs 344 can be an indication to an installer that a minimum insertion length has been achieved. - The snap-nut assembly described above may be utilized in any anchoring system in which it is desired to axially secure a shaft such as a threaded shaft to a support structure. Therefore, the snap-nut assemblies disclosed herein may be integrated into various anchoring or connection systems including metal deck anchoring systems such as described in U.S. Pat. No. 4,007,563 to Nakagawa and which is incorporate herein by reference in its entirety.
-
FIG. 7A-7C show an alternate embodiment of the anchor assembly ofFIGS. 1A and 1B . The anchor assembly is generally shown at 700 and is similarly to anchorassembly 100 as it also includes adjustable position locking threaded jaws.Anchor assembly 700 includes asupport member 710.Support member 710 includes aflange 738 at an upper end or assembly end.Support member 710 also includes a lower end orinsertion end 712 with aninsertion opening 714, and an inner space 744 for receiving ajaw assembly 750.Flange 738 includes a central cover 760 that defines an upper flange end of inner space 744. Cover 760 is removable and lockable (e.g., with threads) to offer access to inner space 744 for assembly. Inner space 744 includes an inward facinginclined surface 737.Inclined surface 737 slants downward fromflange 738 toward a central longitudinal axis A-A ofanchor assembly 700.Jaw assembly 750 includesjaws Jaws inner threads 702, a radially inward inclinedouter surface 704, and analignment passage 708.Jaw assembly 750 also includes analignment pin 720, analignment stop 740, and a biasingmember 755.Biasing member 755 may be any resilient object such as a coil, leaf or wave spring that compresses to generate a continuous reactive biasing force.Biasing member 755 could also be a resilient solid member such as a piece of rubber (e.g., tube shaped).Alignment stop 740 includes abottom surface 742, an opening orpassage 745 that could be a through passage, and asidewall 746. - When
jaw assembly 750 is assembled,jaws outer surface 704 complementarily engages inclinedsurface 737.Alignment pin 720 passes throughopenings 708 injaws stop 740.Biasing member 755 is compressed between cover 780 and a top of eachjaw compressed biasing member 755 reacts to, forces, or urgejaws insertion end 712. Because theinclined surfaces 737 are slanted or inclined inward, biasingmember 755 ultimately also urgesjaws -
Alignment pin 720 passes throughstop 740 which at least in part serves to stabilizepin 720. In addition, the arrangement ofpin 720 relative to stop 740 avoids any direct contact betweenrod 50 andpin 720.Alignment pin 740 also passes throughjaws alignment pin 720 limits any possible axial misalignment betweenjaws Alignment pin 720 may also be sized inopenings 708 ofjaws jaws rod 50 in order to most effectively accommodaterod 50. - During installation, an installer inserts a
rod 50 intoinsertion opening 714.Rod 50 urgesjaws member 755.Rod 50 is inserted intosupport member 710 until an end ofrod 50 engages a bottom 742 ofstop 740. Bias member 775 continuouslybiases jaws rod 50 contacts abottom 742 ofalignment stop 740.Rod 50 can then no longer be axially removed fromsupport member 710, but can only be removed fromsupport member 710 by thread rotation. - The present invention disclosure may include written description and drawings that describe features in one embodiment that are not disclosed in another embodiment. The present invention contemplates interchanging such features.
Claims (9)
1. A support member of an anchor assembly, the support member for receiving and securing a threaded shaft thereto, the anchor assembly further including a base member that is connectable with the support member, the support member comprising: an outer housing, the outer housing being defined by a central longitudinal axis, the outer housing including an outer wall, the outer housing also including an insertion opening at a first end thereof for receiving the threaded shaft, the outer housing including an upper portion that is separable from a lower portion, the outer wall defining an inner space, a jaw assembly disposed in the inner space, the inner space further includes a tapered surface with a lessening inner surface diameter toward the insertion opening, the jaw assembly including at least two threaded jaws the threads of which selectively engage threads of the shaft, the jaw assembly further including a bias member for biasing the at least two thread jaws toward the longitudinal axis.
2. The support member of claim 1 , wherein the upper portion is connectable to the lower portion via a threaded connection.
3. The support member of claim 1 , wherein the biasing member is a coil spring or leaf spring.
4. The support member of claim 1 , wherein the tapered surface is disposed on the lower portion.
5. The support member of claim 1 , wherein the biasing member urges the at least two threaded jaws toward the tapered member surface.
6. The support member of claim 3 , wherein the biasing member is disposed in the inner space to bias the at least two threaded jaws against the jaw assembly.
7. The support member of claim 1 , wherein one of the upper and lower portions including a male thread and the other of the upper and lower portions including a female thread, the male and female threads connectable complementarily together to form the outer housing.
8. The support member of claim 7 , wherein the lower portion includes a tapered seat for engagement with a complementarily tapered seat of the jaw assembly.
9. A support member of an anchor assembly, the support member for receiving and securing a threaded shaft thereto, the anchor assembly further including a base member that is connectable with the support member, the support member comprising: an outer housing, the outer housing being defined by a central longitudinal axis, the outer housing including an outer wall, the outer housing further including an upper portion and a lower portion, the outer housing also including an insertion opening at a first end thereof for receiving the threaded shaft, the outer wall defining an inner space, a jaw assembly disposed in the inner space, the inner space further includes a tapered surface with a lessening inner surface diameter toward the insertion opening, the jaw assembly including at least two threaded jaws the threads of which selectively engage threads of the shaft, the jaw assembly further including a bias member for biasing the at least two thread jaws toward the longitudinal axis, wherein one of the upper and lower portions including a male thread and the other of the upper and lower portions including a female thread.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US18/447,825 US20230383780A1 (en) | 2018-03-16 | 2023-08-10 | Snap nut concrete anchor assembly |
Applications Claiming Priority (3)
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US15/923,052 US10927874B2 (en) | 2018-03-16 | 2018-03-16 | Snap nut concrete anchor assembly |
US17/173,321 US11754108B2 (en) | 2018-03-16 | 2021-02-11 | Snap nut concrete anchor assembly |
US18/447,825 US20230383780A1 (en) | 2018-03-16 | 2023-08-10 | Snap nut concrete anchor assembly |
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US17/173,321 Continuation US11754108B2 (en) | 2018-03-16 | 2021-02-11 | Snap nut concrete anchor assembly |
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US20230383780A1 true US20230383780A1 (en) | 2023-11-30 |
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US15/923,052 Active US10927874B2 (en) | 2018-03-16 | 2018-03-16 | Snap nut concrete anchor assembly |
US17/173,321 Active 2038-08-03 US11754108B2 (en) | 2018-03-16 | 2021-02-11 | Snap nut concrete anchor assembly |
US18/447,825 Pending US20230383780A1 (en) | 2018-03-16 | 2023-08-10 | Snap nut concrete anchor assembly |
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US15/923,052 Active US10927874B2 (en) | 2018-03-16 | 2018-03-16 | Snap nut concrete anchor assembly |
US17/173,321 Active 2038-08-03 US11754108B2 (en) | 2018-03-16 | 2021-02-11 | Snap nut concrete anchor assembly |
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US11951600B2 (en) * | 2018-07-03 | 2024-04-09 | Hilti Aktiengesellschaft | Setting tool system for anchoring systems |
US10689841B2 (en) * | 2018-11-09 | 2020-06-23 | Anchor Ring Solutions, Llc | Construction anchoring system, apparatus and methodology |
USD946127S1 (en) * | 2019-04-05 | 2022-03-15 | Comalander Fabrication and Services, LLC | Platform and insert set for a pipe support system |
US20200325924A1 (en) * | 2019-04-12 | 2020-10-15 | Black & Decker Inc. | Cast-in place anchor with multi-use jaws and removable nose-piece |
US11608630B2 (en) * | 2019-04-12 | 2023-03-21 | Black & Decker Inc. | Cast-in place anchor with lockable jaw assembly |
EP3783234A1 (en) * | 2019-08-21 | 2021-02-24 | Hilti Aktiengesellschaft | Threaded rod connector with rotationally locked collar |
US20220178135A1 (en) * | 2020-12-03 | 2022-06-09 | UNIVERSITé LAVAL | Snap joint and method of use |
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Also Published As
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US20190285105A1 (en) | 2019-09-19 |
US10927874B2 (en) | 2021-02-23 |
EP4063672A1 (en) | 2022-09-28 |
EP3540245A1 (en) | 2019-09-18 |
EP3540245B1 (en) | 2022-06-22 |
US11754108B2 (en) | 2023-09-12 |
US20210164509A1 (en) | 2021-06-03 |
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