CONNECTING STRUCTURE OF STEEL BAR

• US 20100003074A1
• Filed: 12/21/2007
• Published: 01/07/2010
• Est. Priority Date: 12/21/2006
• Status: Abandoned Application

• Current Assignee: Baro Construction Key-Technology Co., Ltd.
• Original Assignee: Baro Construction Key-Technology Co., Ltd.
• Inventors: Kim, Kwang Man
• Application Number:
  US12/517,756
• Publication Number:
  US 20100003074A1
• Time in Patent Office: Days
• US Class Current: 403/334
• CPC Class Codes: E04C 5/165 Coaxial connection by means of sleeves
• CPC Class Codes: F16B 7/182 for coaxial connections of two rods or tubes
• CPC Class Codes: Y10T 403/556 Section threaded to member
• CPC Class Codes: Y10T 403/7069 Axially oriented

Abstract

A steel bar connecting structure is disclosed. The steel bar connecting structure includes a connecting sleeve having on an inner circumference thereof an internal threaded part, and a steel bar having an external threaded part which engages with the internal threaded part. The steel bar is inserted into the connecting sleeve. Each of the internal threaded part and the external threaded part is formed such that a crest of each of threads thereof is cut. Thereby, when the steel bar is strongly coupled to the connecting sleeve, a neighboring crest and root of the internal threaded part and the external threaded part are not in contact with each other, whereas inclined flanks of the threads of the internal threaded part and the external threaded part are in close contact with each other.

Claims

1. A steel bar connecting structure, comprising:

a connecting sleeve having on an inner circumference thereof a first internal threaded part; and

a steel bar having a second external threaded part which engages with the first internal threaded part, the steel bar being inserted into the connecting sleeve, wherein

each of the first internal threaded part and the second external threaded part is formed such that a crest of each of threads thereof is cut, whereby

when the steel bar is strongly coupled to the connecting sleeve, a neighboring crest and root of the first internal threaded part and the second external threaded part are not in contact with each other, whereas inclined flanks of the threads of the first internal threaded part and the second external threaded part are in close contact with each other.

9. The steel bar connecting structure according to claim 1, wherein an observation hole is provided in the center of the connecting sleeve.

2. A steel bar connecting structure comprising a connecting sleeve which has a cylindrical shape, and has on an inner circumference thereof a first internal threaded part, and is inclined such that an outer diameter of the connecting sleeve is reduced from a center thereof to opposite ends thereof, with first external threaded parts provided on inclined parts of an outer circumference of the connecting sleeve, and a plurality of slits provided in the opposite ends of the connecting sleeve and extending in a longitudinal direction of the connecting sleeve, two nuts fastened to the first external threaded parts, respectively, and a steel bar having on an outer circumference thereof a second external threaded part, which engages with the first internal threaded part, wherein

a circumference of the second external threaded part of the steel bar is smaller than a circumference of the first internal threaded part provided on an inner circumference of the connecting sleeve so that the second external threaded part is not in complete contact with the first internal threaded part, and

a crest of each of threads of the first internal threaded part and the second external threaded part is cut, whereby

when the steel bar is inserted into the connecting sleeve and each of the nuts is fastened to each of the first external threaded parts provided on the outer circumference of the connecting sleeve, so that the slits become narrow and the steel bar is strongly coupled to the connecting sleeve, a neighboring crest and root of the threads of the internal threaded part and the external threaded part are not in contact with each other, and inclined flanks of the threads of the internal threaded part and the external threaded part are in close contact with each other.

3. The steel bar connecting structure according to claim 2, wherein the slits comprise four or more slits arranged radially.

4. The steel bar connecting structure according to claim 3, wherein the slits are alternately arranged on the opposite ends of the connecting sleeve, and extend from the opposite ends of the connecting sleeve through a center thereof to predetermined positions.

5. The steel bar connecting structure according to claim 4, wherein part of a thread, positioned at an end of the steel bar, is eliminated to a depth of a root, and a first end surface is provided on an end thread among the remaining threads, and a filling part having no root is provided at a center in the connecting sleeve.

6. A steel bar connecting structure, comprising:

a connecting sleeve having on an inner circumference thereof first concave parts and first convex parts at regular intervals in such a way as to be perpendicular to a longitudinal direction of the connecting sleeve; and

a steel bar inserted into the connecting sleeve, and having second concave parts and second convex parts in such a way as to be perpendicular to a longitudinal direction of the steel bar, the second concave parts and the second convex parts being coupled to the first concave parts and the first convex parts, wherein

each of the first convex parts of the connecting sleeve is not higher than a corresponding first concave part of the steel bar, and each of the first concave parts of the connecting sleeve is higher than a corresponding second convex part of the steel bar, so that when the steel bar is coupled to the connecting sleeve, apexes of the convex and concave parts of the connecting sleeve and the steel bar are in contact with each other, and inclined side surfaces of the concave and convex parts are in strong close contact with each other, when the steel bar is coupled to the connecting sleeve.

7. A steel bar connecting structure, comprising:

a connecting sleeve comprising a plurality of parts which are divided in a longitudinal direction of the connecting sleeve and are assembled with each other, thus forming a cylindrical shape, an outer circumference of the connecting sleeve being inclined such that a thickness thereof is reduced from a center of the connecting sleeve to opposite ends thereof, with first external threaded parts provided on the outer circumference of the connecting sleeve, the connecting sleeve having on an inner circumference thereof first concave parts and first convex parts at regular intervals in such a way as to be perpendicular to the longitudinal direction of the connecting sleeve;

two nuts fastened to the first external threaded parts, respectively; and

steel bars each having on an outer circumference thereof second concave parts and second convex parts in such a way as to be perpendicular to a longitudinal direction of the steel bar, the second concave parts and the second convex parts being coupled to the first concave parts and the first convex parts, wherein

when the divided parts of the connecting sleeve are positioned between the two steel bars, and the nuts are fastened to first external threaded parts, which are provided on inclined parts of the opposite ends of the connecting sleeve, the divided parts of the connecting sleeve are brought near to each other, and an inner diameter of the connecting sleeve is reduced, and since each of the first convex parts of the connecting sleeve is not higher than a corresponding first concave part of each of the steel bars, and each of the first concave parts of the connecting sleeve is higher than a corresponding second convex part of the steel bar, apexes of the concave and convex parts of the connecting sleeve and each of the steel bars are not in contact with each other, and inclined side surfaces of the concave and convex parts are in close contact with each other, when the steel bar is coupled to the connecting sleeve.

8. The steel bar connecting structure according to claim 7, wherein a stop protrusion protrudes inwards from an inner circumference of each of the divided parts of the connecting sleeve, so that when the two steel bars are inserted into the connecting sleeve, the steel bars do not pass through the center of the connecting sleeve.