IP Library › Granted Patent US 12698665
Granted Patent B2
US 12698665 · App. 18/698,079 · Granted Aug 4, 2026

Adjustable retraction mechanism

Inventors: Eli Volkun (Kiryat Bialik, IL); Lidor Shalom Elharar (Afula, IL)
Assignee: ELVO LTD
E05F1/16E05D13/00E05D13/1292E05Y2201/26E05Y2201/484E05Y2201/654E05Y2900/132
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Quick Facts
Patent No.
US 12698665
App. No.
18/698,079
Granted
Aug 4, 2026
Kind
B2
Abstract

An adjustable retraction mechanism includes a main housing, the main housing includes a cord wrapped around a torsion spring and rigidly attached thereto at one end thereof. The retraction mechanism further includes an adjustable cord friction mechanism configured for reducing a force applied on the cord. The friction mechanism includes at least one adjustable pressing member which applies a friction force on the cord.

Claims (16)

1 . An adjustable retraction mechanism ( 10 ) comprising:

a main housing ( 20 ), the main housing ( 20 ) comprising:

a cord ( 16 ) wrapped around a torsion spring ( 14 ) and rigidly attached thereto at one end thereof;

an adjustable cord friction mechanism ( 22 ) configured for reducing a pulling force applied on the cord ( 16 ) by the spring ( 14 ), the friction mechanism ( 22 ) comprising at least one adjustable pressing member ( 24 ) applying a friction force on the cord ( 16 ), wherein the at least one adjustable pressing member ( 24 ) comprises a replaceable contact member ( 28 ) which contacts the cord ( 16 );

a spring housing ( 12 ) located between the spring ( 14 ) and the cord ( 16 ), the spring ( 14 ) is located within and attached to the spring housing ( 12 ) and the cord is wrapped around, and attached at one end, to the spring housing ( 12 ), wherein the spring housing ( 12 ) is fully enclosed within the main housing ( 20 ); and

an adjustable preload mechanism ( 32 ), wherein the preload mechanism ( 32 ) comprises a winding member ( 34 ) which comprises at least two fixation interfaces ( 40 ) and a fixation member ( 36 ) located in one of the fixation interfaces ( 40 ).

2 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the winding member ( 34 ) is rigidly and directly connected to the spring ( 14 ) via a winding connector ( 38 ).

3 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the main housing ( 20 ) further comprises at least one fixation interface ( 40 ).

4 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the pressing member ( 24 ) is a male screw which comprises a male thread engaged with an internal female thread of a bushing ( 26 ) rigidly secured within the main housing ( 20 ).

5 . The adjustable retraction mechanism ( 10 ) according to claim 4 , wherein the bushing ( 26 ) is made of metal.

6 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the cord friction mechanism ( 22 ) comprises unscrewing prevention means ( 30 ) configured to prevent rotational movement of the pressing member ( 24 ).

7 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the pressing member ( 24 ) is made of metal.

8 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the cord friction mechanism ( 22 ) comprises exactly two pressing members ( 24 ).

9 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the spring ( 14 ) is made of metal.

10 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the cord ( 16 ) is made of metal.

11 . The adjustable retraction mechanism ( 10 ) according to claim 1 , wherein the main housing ( 20 ) is made of plastic.