Screw connection, in particular for a clamp, and clamp

Patent metadata

Field	Value
Publication number	US-9702491-B2
Application number	US-201414197656-A
Country	US
Kind code	B2
Filing date	Mar 5, 2014
Priority date	Mar 6, 2013
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Screw connection, in particular, a tension clamp, and method of forming the screw connection. The screw connection includes a screw having a screw head and an external thread with a thread turn profile and a thread axis, and a mating thread element having an internal thread, matched to the external thread, with at least one thread groove bordered by thread flanks to screwably receive the screw. A geometrically defined deformation of the external thread is arranged at a predetermined distance from the screw head to collide with at least one thread flank during the screwing of the screw into the mating thread element.

First claim

What is claimed:

1. A screw connection comprising:
a screw having a screw head and an external thread with a thread turn profile and a thread axis;
a mating thread element having an internal thread, matched to the external thread, with at least one thread groove bordered by thread flanks to screwably receive the screw; and
a geometrically defined deformation of the external thread being arranged at a predetermined distance from the screw head to collide with at least one thread flank during the screwing of the screw into the mating thread element,
wherein the external thread and the internal thread are connected to one another by seizing up at at least one connection point in a region of the deformation, and
wherein the mating thread element has a lead-in region on the internal thread in which a depth of the thread groove of the internal thread gradually increases in an insertion direction and the connection point is arranged in the lead-in region,
wherein a length of the lead-in region is one to three times a thread pitch length.

2. The screw connection according to claim 1 , wherein the screw connection is structured and arranged as a tension clamp.

3. The screw connection according to claim 1 , wherein the deformation has at least two deformation regions arranged in a circumferential direction in a distributed manner.

4. The screw connection according to claim 3 , wherein the at least two deformation regions are arranged to diametrically oppose each other in relation to the thread axis.

5. The screw connection according to claim 1 , wherein the deformation is embodied as a shaping.

6. The screw connection according to claim 5 , wherein the shaping is formed as a radial indentation of at least one thread turn profile.

7. The screw connection according to claim 6 , wherein the external thread has a predefined thread depth and the radial indentation has a radial depth of at least 80% of the thread depth.

8. The screw connection according to claim 1 , wherein the external thread has a predefined pitch and the deformation has a width of at least 40% of the pitch.

9. The screw connection according to claim 1 , wherein the screw and the mating thread element comprise, at least in a region of the external thread and internal thread, stainless steel.

10. The screw connection according to claim 1 , wherein the deformation is embodied as a negative shape of a ridge.

11. The screw connection according to claim 10 , wherein the negative shape has one of a rectangular, round, oval, triangular, polygonal or trapezoidal cross section.

12. A tension clamp comprising:
an annularly embodied clamp band having has two tensioning heads,
wherein the two tensioning heads are connectable to one another by the screw connection according to claim 1 .

13. The tension clamp according to claim 12 , wherein only one of the two tensioning heads comprises the mating thread element.

14. The tension clamp according to claim 12 , wherein the deformation comprises a plurality of depression regions arranged at the predetermined distance from the screw head and circumferentially spaced from each other.

15. The tension clamp according to claim 12 , wherein the deformation at the predetermined distance from the screw head prevents the two tensioning heads from contacting each other during a screwing of the screw into the mating thread element.

16. A method of forming a screw connection, comprising:
forming a deformation in at least one deformation region of an external thread of a screw located at a predetermined distance from a screw head of the screw; and
screwing the screw into a mating thread element having an internal thread that matches the external thread so that the external thread and the internal thread are connected to one another until seizing up at at least one location in a region of the deformation,
wherein the mating thread element has a lead-in region on the internal thread in which the depth of the thread groove of the internal thread gradually increases in the insertion direction and the connection point is arranged in the lead-in region, and
wherein a length of the lead-in region is one to three times a thread pitch length.

17. The method according to claim 16 , wherein the at least one deformation region comprises a plurality of deformation regions located at the predetermined distance from the screw head and circumferentially spaced from each other.

18. The screw connection according to claim 1 , wherein the deformation extends in a direction parallel to a line perpendicular to the thread axis.

19. The method according to claim 16 , wherein the deformation extends in a direction parallel to a line perpendicular to the thread axis.

Assignees

• Norma Germany Gmbh

Inventors

• Breitenbach Gerrit V
• Heywood Jonathan
• Sakowski Christian
• Franke Christian
• Baudoin Manuel
• Riyahi Farhad

Classifications

• F26B2200/24

  Wood particles, e.g. shavings, cuttings, saw dust · CPC title

• F16B33/02

  Shape of thread; Special thread-forms ({F16B25/00 takes precedence; used to remove paint or dirt layers F16B35/007, F16B37/002}; used as screw-locking device F16B39/30) · CPC title

• F16L2201/10

  Indicators for correct coupling · CPC title

• Y10T24/1441

  Tangential screw · CPC title

• F16L33/04 Primary

  tightened by tangentially-arranged threaded pin and nut · CPC title