REINFORCEMENT BAR FASTENER AND TOOL
A reinforcement bar fastener and a tool for securing reinforcement bar members to together to form a metal mesh and a reinforcement bar tool for deforming the reinforcement bar fastener around the reinforcement bar members.
The present application claims priority under 35 U.S.C. §120 and 365(c) to PCT Application No. PCT/2013/020345, filed Jan. 4, 2013, which PCT application claims priority under §119 to U.S. Provisional Application Ser. No. 61/583,686 filed on Jan. 6, 2012. Each of the aforementioned applications is incorporated by reference in their entirety.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a fastener for securing metal bars, such as reinforcement bars (rebar members) together. The present invention also relates to a pneumatic, electronic, gas-combustion or hand-operated tool for bending the fastener around the rebar members and in particular to such a device which is portable and can be used on the ground at construction sites.
2. Description of the Related Art
Steel rebar members generally used in the concrete industry are tied together using wire. The wire is either hand tied or automatically tied using rebar tying tools. In most of the tying operations, the wire is fed around two bars, and then the wire is twisted.
SUMMARY OF THE INVENTIONIn an embodiment of the present invention, a reinforcement bar fastener (rebar fastener) has a substantially T-shaped body with an upper horizontal portion that fauns a crossbar between and is integral with a lower pair of legs.
In an embodiment of the present invention, there is a fastening tool for applying a driving force to the reinforcement bar fastener to bend the fastener around rebar members to secure the rebar members to each other. The fastening tool can have a body including a driver that provides a downward force on the crossbar portion of the rebar fastener while retractable anvil arms bend the lower vertical leg portions of the rebar fastener upward around the arranged rebar members. The fastening tool includes clamping arms that close the fastener around arranged rebar members to join the rebar members together while applying a force to the crossbar portion of the fastener.
In an embodiment described below, a fastener includes a pair of legs arranged parallelly. The pair of legs including a first leg having opposite first and second ends and a second leg having opposite first and second ends. A crossbar is provided having a center section and a pair of projecting ears extending from the center section. The pair of projecting ears include a first ear having a first end connected to the center section and a second end connected to the first end of the first leg and a second ear having a first end connected to the center section and a second end connected to the first end of the second leg.
In an embodiment, a fastening tool for deforming a rebar fastener around arranged rebar members is provided. The tool includes a portable housing assembly and a nosepiece carried by the portable housing assembly. The nosepiece has a drive track and at least a portion of the drive track is defined by a portion of the nosepiece. A fastener driver is movably mounted in the drive track for deforming a first portion of the rebar fastener. A magazine assembly is constructed and arranged to feed successive leading fasteners from a supply of fasteners contained therein along a feed track and into the drive track. A power operated system is constructed and arranged to be actuated so as to move the fastener driver through successive operative cycles. Each cycle includes a drive stroke wherein a fastener in the drive track is deformed around rebar members to be secured together, and a return stroke. An actuating mechanism includes a trigger assembly having a trigger constructed and arranged to actuate the power operated system in response to the trigger being pulled. A carriage is slidably mounted to the nosepiece. A pair of claws is mounted to the carriage for holding one of a plurality of rebar members in position for fastening. A pair of anvil anus are pivotably connected to the nosepiece. Each anvil arm carries an anvil for deforming a second portion of the rebar fastener.
In an embodiment, there is a method of fastening rebar members together using a deformable rebar fastener. The deformable rebar fastener has a generally T-shaped body formed of a pair of legs arranged in parallel to form an open end and a crossbar having an upper portion and a lower portion forming a closed end. The crossbar is arranged to span and be connected to the pair legs. The pair of legs and the crossbar are in the same lateral plane. The method includes arranging the rebar members to form an upper rebar member and a lower rebar member and positioning the rebar fastener open end over the arranged rebar members so that the legs straddle the rebar members and the crossbar spans the upper rebar member. A first force is applied to the upper portion of the crossbar in the direction of the longitudinal axis of the legs, to bend the crossbar toward the legs. A second force is applied to each of the legs in opposing directions perpendicular to the first force. The legs are bent by the forces in a direction extending 45 degrees from the plane of the crossbar with each leg being bent in opposite directions around the arranged rebar members.
In the embodiments of the present invention, the fastening tool can accommodate rebar members arranged perpendicularly, or parallel or a range of angles. Further, joining rebar members with a pneumatic, electronic, gas-combustion or hand-operated tool of the present invention is less demanding on the body of the user than hand-tying. In addition, providing in a single tool the components to secure together both perpendicularly and parallelly arranged rebar members while accommodating tightly collated fasteners and to produce an increased tightness in the connection between the rebar members, results in cost savings and flexibility in constructing rebar that is not present in existing rebar construction tools.
Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure, its application and/or uses in any way.
The numerous advantages of the present invention may be better understood by those skilled in the art by reference to the accompanying figures. In the drawings, like reference numerals designate corresponding parts throughout the several views.
Reference will now be made in detail to the presently preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings.
The rebar fastener 10 of the present invention is an elongated member, such as, for example, a wire having a substantially T-shaped body. The T-shaped body is formed from a leg portions 12 arranged in parallel and a crossbar portion 14 that extends between the pair of legs. The pair of legs includes a first leg 12a having opposite first 12a-1 and second ends 12a-2 and a second leg 12b having opposite first 12b-1 and second ends 12b-2. The pair of legs 12a, 12b can have the same length, such as length L2, substantially the same length, or have different lengths.
The crossbar portion 14 has a looped or folded form such that a lower portion 14b of the crossbar is folded beneath or adjacent to an upper portion 14a of the crossbar. The lower portions 14b of the crossbar are connected to the upper portions of the legs 12a-1, 12b-1 of the rebar fastener 10. The upper portion 14a of the crossbar includes a center section 14c that extends in a direction perpendicular to the legs 12. The crossbar portion 14 also includes a pair of projecting ears 14d, 14e that extend laterally from the center section 14c. The pair of projecting ears 14d, 14e includes a first ear 14d and a second ear 14e. The first ear 14d can be U-shaped and have one end connected to the center section 14c and the other end connected to one of the legs, such as the first leg 12a, for example, at 12a-1. The second ear 14e can also be U-shaped and have one end connected to the center section 14c and the other end connected to the second leg 12b, such, for example, at 12b-1.
The crossbar 14 of the rebar fastener 10 can be integral with the pair of legs 12. For example, the rebar fastener 10 can be formed from a single strand of material, and bent into the shape of the T-shaped body described above. Alternatively, the rebar fastener can be formed from a plurality of strands of the same material. Additionally, a plurality of materials can be used to form the rebar fastener. The intersection of the crossbar and the legs, such as at 12a-1 and 12b-1, can be curved surfaces. Also, the projecting ears can have a curved or arcuate surface such that there are no sharp edges that could break upon deformation of the rebar fastener.
As shown in
In the undeformed state of the rebar fastener 10, as shown in
The center section 14c of the crossbar 14, located between the projecting ears 14d, 14e, can be configured to be perpendicular to the pair of legs 12. In this configuration, the center section 14c is horizontal with respect to the projecting ears 14d, 14e which are angled away from the legs 12. The first ear 14d and second ear 14e can be angled away from the center section 14c at an angle θ greater than zero degrees, for example, at an angle of about 15 degrees.
The rebar fastener 10 is designed to hold rebar members together. In this regard, the legs 12 of the rebar fastener 10 can be deformed around the body of the rebar members and conform to the shape of the rebar members. The crossbar 14 can be flattened across an uppermost surface of the rebar members.
The legs of the rebar fastener provide the principal connection for fastening rebar members together. In an undeformed state, the legs 12 of the rebar fastener are initially in the same lateral plane as the crossbar. As seen in
The rebar fastener is designed to be deformed around sections of rebar to secure the rebar members to each other. The rebar fastener 10 can be deformed by applying forces to different portions of the fastener to bend the fastener around the rebar members. The forces can be applied to the crossbar 14 and the legs 12 with a tool. In an embodiment, the tool can be manual, electrically powered, driven by gas combustion, or pneumatically and apply forces as show in
To secure the rebar members together with the rebar fastener 10, the rebar fastener is positioned over the upper rebar member so that the crossbar 14 spans an upper rebar member 20 and the legs 12 straddle both upper 20 and lower 22 rebar members as shown for example in
The rebar fastener 10 can be deformed by applying a force F1 on the projecting ears 14d, 14e of the crossbar 14 in the longitudinal direction of the legs 12 as shown in
The legs 12 of the rebar fastener 10 can be positioned against a portion of the tool body and deformed by forces applied in laterally opposing directions to the legs.
The tool or device can include articulated arms 24 including a roller portion 26 that rolls the legs 12 upward around the lower rebar member about the Z-axis as shown in
The tool or device that applies forces to the rebar fastener, as shown in
The body of the rebar fastener 10 can be metallic and formed from a strand of steel wire, for example. Alternatively, the body of the rebar fastener can be die-cut or formed from a strip of steel or formed from steel sheets through a progressive stamping operation. Other materials that can be used to form the fastener include plastic or a composite material. Further, a combination of materials or material properties can be used for the fastener.
In order to create a secure rebar joint, springback in the legs must be reduced. If springback in the legs is not reduced, then after being deformed around the rebar members, when the legs relax and loosen, the joint can become weakened. The geometry of the rebar fastener of the present embodiments is such that the length L1 of the crossbar 14 can be greater than the length L3 between the first 12a and second 12b legs, as shown in
The geometry ensures that, upon deformation of the rebar fastener 10, the springback in the crossbar 14 is greater than the springback in the legs 12, which creates a secure joint for holding the rebar members together. In order to create a more secure or tighter joint for holding the rebar members, the crossbar 14 can be heat-treated while the legs remain un-treated. Heat treating the crossbar 14 results in increased compensation for springback in the legs 12. Heat-treating substantially increases the crossbar yield strength over the crossbar yield strength without heat-treating. The higher yield strength produces a greater displacement of the projecting ears 14d, 14e away from the center section 14c and results in the increased compensation for springback in the legs.
The rebar fastener can also be deformed with a reinforcement bar fastening tool (rebar fastening tool).
As shown in
A power operated system 60 is constructed and arranged to be actuated so as to move the fastener driver 34 through successive operative cycles. Each cycle includes a drive stroke wherein the rebar fastener 10 in the drive track 56 is deformed around rebar members 20, 22 to be secured together, and a return stroke. The trigger assembly is part of an actuating mechanism and includes the trigger 33. The trigger assembly is constructed and arranged to actuate the power operated system in response to the trigger 33 being pulled.
The claws 42 of the tool have a shape that corresponds to the shape of the rebar member. For example, as shown in
The anvil anus 38 are spring-biased outward, away from the nosepiece 32, so as to fit over the space around the rebar members. A spring (not shown) can be located between the anvil arms and the nosepiece 32, for example. Alternatively, the spring can be arranged in a position that biases the anvil arms 38 away from the nosepiece 32. The anvil arms 38 have an inner portion that faces the nosepiece and an outer portion that faces away from the nosepiece. The anvil arms 38 are pivotable on pivot point 54. The pivot point 54 for the anvil arms 38 is mounted to the nosepiece 32. The claws 42 of the rebar tool 30 grasp the lower rebar member 22 to hold the rebar member in position for fastening. During the fastening process, the anvil arms 38 of the tool, which carry the anvils 36, rotate toward each other to a position underneath the rebar members as shown in
When the carriage 40 is located at the bottom stroke of a rotation, the tool operator can actuate the tool 30 to move the fastener driver 34 to separate one rebar fastener 10 from a plurality of rebar fasteners stored in the magazine assembly 44 on the tool. The fastener driver 34 forces the rebar fastener 10 into a radiused path inside the anvil arms 38 and underneath the lower rebar member 22, as shown in
In operation, the tool operator can arrange the rebar members in an upper rebar member and a lower rebar member configuration. The rebar members can be arranged parallelly, perpendicularly, or in a range of angles therebetween. The tool operator can position the tool 30 above the rebar members to be fastened. The pusher 50 in the magazine 44 moves successive fasteners to the drive track 56 that is slidably mounted to the nosepiece 32. The open end of the leading rebar fastener 10 can be placed over the arranged pair of rebar members 20, 22 so that the legs 12 straddle the rebar members and the crossbar 14 spans the upper rebar member 20. The nosepiece, which is fixed, can be placed onto the crossbar portion 14 of the rebar fastener 10.
A first force from the fastener driver can be applied to the upper portion of the crossbar in the direction of the longitudinal axis of the legs, to bend the projecting ears 14d, 14e toward the legs 12. A second force can be applied to each of the first 12a and second 12b legs in opposing directions perpendicular to the first force. The first force and second force can be applied serially or simultaneously. The application of the first force and second force can bend the legs in a direction extending 45 degrees from the plane of the crossbar 14 with each leg 12a, 12b being bent in opposite directions around the rebar members 20, 22.
While the rebar fastening tool is illustrated as being pneumatically powered by a suitable power source, such as compressed air, those skilled in the art will appreciate that the invention, in its broader aspects, may be constructed somewhat differently and that aspects of the present invention may have applicability to electrically powered driving tools, powered by a battery pack. In addition, to a pneumatic and electronic powered tool, the tool can also be powered by gas-combustion, or hand-operated with a mechanical advantage.
Furthermore, while aspects of the present invention are described herein and illustrated in the accompanying drawings in the context of a rebar fastening tool, those of ordinary skill in the art will appreciate that the invention, in its broadest aspects, has further applicability. For example, the fastening tool of the present invention includes features such as a clawing motion that may also be applicable for tying land erosion netting, in agricultural applications and in pipe-fitting. Further, the rebar fasteners of the present invention may have applicability for fastening pipes or conduits as typically found in the pipe-fitting and electrical trades.
It will be appreciated that the above description is merely exemplary in nature and is not intended to limit the present disclosure, its application or uses. While specific examples have been described in the specification and illustrated in the drawings, it will be understood by those of ordinary skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure as defined in the claims. Furthermore, the mixing and matching of features, elements and/or functions between various examples is expressly contemplated herein, even if not specifically shown or described, so that one of ordinary skill in the art would appreciate from this disclosure that features, elements and/or functions of one example may be incorporated into another example as appropriate, unless described otherwise, above. Moreover, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular examples illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out the teachings of the present disclosure, but that the scope of the present disclosure will include any embodiments falling within the foregoing description and the appended claims.
Claims
1. A fastener comprising:
- a pair of legs arranged parallelly, the pair of legs including a first leg having opposite first and second ends and a second leg having opposite first and second ends;
- a crossbar having a center section and a pair of projecting ears extending from the center section, the pair of projecting ears including a first ear having a first end connected to the center section and a second end connected to the first end of the first leg and a second ear having a first end connected to the center section and a second end connected to the first end of the second leg.
2. The fastener of claim 1, wherein the pair of legs and the crossbar are formed in the same plane.
3. The fastener of claim 1, wherein the first ear and second ear are angled away from the pair of legs.
4. The fastener of claim 3, wherein the first ear and second ear are angled away from the pair of legs at an angle of about 105 degrees.
5. The fastener of claim 1, wherein the center section is configured to be perpendicular to the pair of legs.
6. The fastener of claim 5, wherein the first ear and second ear are angled away from the center section at an angle of about 15 degrees.
7. The fastener of claim 1, wherein the fastener is formed of a metal wire.
8. The fastener of claim 1, wherein the fastener is formed of a material comprising at least one of steel, plastic, and a composite.
9. The fastener of claim 1, wherein the pair of legs and crossbar are integrally formed of a single wire strand.
10. The fastener of claim 1, wherein the fastener is substantially T-shaped.
11. The fastener of claim 1, wherein the length of the crossbar is greater than the length of each of the legs.
12. A fastening tool comprising:
- a portable housing assembly;
- a nosepiece carried by the portable housing assembly, the nosepiece having a drive track, at least a portion of the drive track being defined by a portion of the nosepiece;
- a fastener driver movably mounted in the drive track;
- a magazine assembly constructed and arranged to feed successive leading fasteners from a supply of fasteners contained therein along a feed track and into the drive track;
- a power operated system constructed and arranged to be actuated so as to move the fastener driver through successive operative cycles, each cycle including a drive stroke wherein a fastener in the drive track is deformed around rebar members to be secured together, and a return stroke;
- an actuating mechanism including a trigger assembly having a trigger constructed and arranged to actuate the power operated system in response to the trigger being pulled;
- a carriage slidably mounted to the nosepiece;
- a pair of claws mounted to the carriage for holding one of a plurality of rebar members in position for fastening; and
- a pair of anvil arms pivotably connected to the nosepiece, each anvil arm carrying an anvil.
13. The fastening tool according to claim 12, wherein the nosepiece is fixed in the tool.
14. The fastening tool according to claim 12, wherein the carriage circumscribes the nosepiece slides along the longitudinal axis of the nosepiece.
15. The fastening tool according to claim 12, wherein the fastener driver slides along the nosepiece.
16. The fastening tool according to claim 12, further comprising a U-shaped channel on a bottom surface of the magazine assembly for holding at least one rebar member to be fastened.
17. The fastening tool according to claim 12, wherein the anvils include a plurality of grooves for guiding portions of a fastener to deform around the rebar members to be secured together.
18. The fastening tool according to claim 12, wherein the carriage comprises rollers for stopping pivotal movement of the anvil arms.
19. The fastening tool according to claim 18, wherein the anvil arms have cam surfaces disposed on an outer portion thereof configured to engage the rollers on the carriage.
20. A method of fastening rebar members together using a deformable rebar fastener, the deformable rebar fastener having a generally T-shaped body formed of a pair of legs arranged in parallel to form an open end and a crossbar having an upper portion and a lower portion forming a closed end, the crossbar being arranged to span and be connected to the pair legs, the pair of legs and the crossbar being in the same lateral plane, the crossbar, the method comprising:
- arranging the rebar members to form an upper rebar member and a lower rebar member;
- positioning the rebar fastener open end over the arranged rebar members so that the legs straddle the rebar members and the crossbar spans the upper rebar member;
- applying a first force to the upper portion of the crossbar in the direction of the longitudinal axis of the legs, to bend the crossbar toward the legs;
- applying a second force to each of the legs, the second force being applied in opposing directions perpendicular to the first force,
- wherein the legs are bent in a direction extending 45 degrees from the plane of the crossbar with each leg being bent in opposite directions around the arranged rebar members.
Type: Application
Filed: Jun 17, 2014
Publication Date: Dec 4, 2014
Inventors: Mustafa KARABAS (Mansfield, MA), Brian C. BURKE (Barrington, RI), Donald R. PERRON (North Smithfield, RI)
Application Number: 14/306,341
International Classification: E04C 5/18 (20060101); E04G 21/12 (20060101);