Blind cord resistance adjustment structure and blind

1 . A blind cord resistance adjustment structure, comprising a cord-winding shaft assembly, an adjustment block ( 3 ) and a blind cord ( 4 ), wherein the cord-winding shaft assembly comprises a housing ( 21 ), a rotating shaft ( 22 ) and a shaft sleeve ( 23 ), the shaft sleeve ( 23 ) is rotatably mounted in the housing ( 21 ) along a circumferential direction of the shaft sleeve, the shaft sleeve ( 23 ) is sleeved on the rotating shaft ( 22 ) and rotates synchronously with the rotating shaft ( 22 ), an upper end of the blind cord ( 4 ) is connected to the shaft sleeve ( 23 ), and the adjustment block ( 3 ) is slidably arranged on a lower side of the housing ( 21 ) along a horizontal direction or a substantially horizontal direction, a first through-hole ( 210 ) for the blind cord ( 4 ) to pass through is provided on the housing ( 21 ), a second through-hole ( 31 ) for the blind cord ( 4 ) to pass through is provided on the adjustment block ( 3 ), at least one elastically deformable deformation portion ( 32 ) is provided on the adjustment block ( 3 ), first positioning teeth ( 321 ) are provided on the deformation portion ( 32 ), and a plurality of first positioning grooves ( 211 ) corresponding to the first positioning teeth ( 321 ) are provided on the housing ( 21 ), and the plurality of first positioning grooves ( 211 ) are distributed along a sliding direction of the adjustment block ( 3 ).

2 . The blind cord resistance adjustment structure according to claim 1 , wherein a first wear-resistant member ( 5 ) is provided on the housing ( 21 ), a second wear-resistant member ( 6 ) is provided on the adjustment block ( 3 ), the first through-hole ( 210 ) is formed on the first wear-resistant member ( 5 ), the second through-hole ( 31 ) is formed on the second wear-resistant member ( 6 ), and the first through-hole ( 210 ) and the second through-hole ( 31 ) are both arranged to penetrate in a vertical direction.

3 . The blind cord resistance adjustment structure according to claim 2 , wherein a first limiting flange ( 51 ) is provided on an upper part of the first wear-resistant member ( 5 ), and a second limiting flange ( 61 ) is provided on an upper part of the second wear-resistant member ( 6 ); during installation, the first limiting flange ( 51 ) abuts against the housing ( 21 ) and is limited thereby, and the second limiting flange ( 61 ) abuts against the adjustment block ( 3 ) and is limited thereby.

4 . The blind cord resistance adjustment structure according to claim 2 , wherein the housing ( 21 ) is provided with a first mounting groove ( 212 ) for mounting the first wear-resistant member ( 5 ), a plurality of first protrusions ( 213 ) are annularly distributed on an inner wall of the first mounting groove ( 212 ) for tightly fitting against the first wear-resistant member ( 5 ), and an upper end of each first protrusion ( 213 ) is provided with a first guiding bevel ( 214 ) for facilitating insertion of the first wear-resistant member ( 5 ) into the first mounting groove ( 212 ); the adjustment block ( 3 ) is provided with a second mounting groove ( 33 ) for mounting the second wear-resistant member ( 6 ), second protrusions ( 331 ) are annularly distributed on an inner wall of the second mounting groove ( 33 ) for tightly fitting against the second wear-resistant member ( 6 ), and an upper end of each second protrusion ( 331 ) is provided with a second guiding bevel ( 332 ) for facilitating insertion of the second wear-resistant member ( 6 ) into the second mounting groove ( 33 ).

5 . The blind cord resistance adjustment structure according to claim 1 , wherein the deformation portion ( 32 ) is an elastic strip capable of being elastically bent, two deformation portions ( 32 ) are symmetrically arranged, a deformation space ( 320 ) for the deformation portion ( 32 ) to bend and deform is arranged between the two deformation portions ( 32 ), and handle blocks ( 322 ) are integrally formed on a lower side of the deformation portions ( 32 ); when adjusting, the handle blocks ( 322 ) are driven by an external force to force the deformation portions ( 32 ) to be elastically bent.

6 . The blind cord resistance adjustment structure according to claim 1 , wherein a first rotating column ( 231 ) and a second rotating column ( 232 ) are respectively provided on either end of the shaft sleeve ( 23 ), a first insertion hole ( 215 ) corresponding to the first rotating column ( 231 ) and a second insertion hole ( 216 ) corresponding to the second rotating column ( 232 ) are provided on the housing ( 21 ), an elastically deformable mounting plate ( 217 ) is provided on the housing ( 21 ), the second insertion hole ( 216 ) is provided on the mounting plate ( 217 ), and a third guiding bevel ( 218 ) is provided on the mounting plate ( 217 ) for facilitating insertion of the second rotating column ( 232 ) into the second insertion hole ( 216 ).

7 . The blind cord resistance adjustment structure according to claim 1 , wherein a sliding groove ( 8 ) is provided on the lower side of the housing ( 21 ), a slider ( 34 ) slidably engaged with the sliding groove ( 8 ) is provided on the adjustment block ( 3 ), an opening ( 81 ) is provided on a lateral end of the sliding groove ( 8 ), and the slider ( 34 ) slides into the sliding groove ( 8 ) from the opening ( 81 ).

8 . The blind cord resistance adjustment structure according to claim 1 , wherein a first bolt ( 9 ) is detachably arranged on the adjustment block ( 3 ), after the adjustment block ( 3 ) is adjusted, the first bolt ( 9 ) is screwed in by an external force so that one end of the first bolt ( 9 ) is pressed against the housing ( 21 ) to limit a relative sliding between the adjustment block ( 3 ) and the housing ( 21 ); a mounting strip ( 219 ) is provided on the housing ( 21 ), the first positioning grooves ( 211 ) are provided on the mounting strip ( 219 ), a limiting protrusion ( 35 ) for abutting against the mounting strip ( 219 ) and being limited thereby is provided on the adjustment block ( 3 ), a fourth guiding bevel ( 351 ) is provided on the limiting protrusion ( 35 ), and when the second through-hole ( 31 ) is located directly below the first through-hole ( 210 ), the limiting protrusion ( 35 ) abuts against the mounting strip ( 219 ) and is limited thereby.

9 . The blind cord resistance adjustment structure according to claim 1 , further comprising an upper beam bracket ( 1 ), wherein the housing ( 21 ) is arranged on a lower side of the upper beam bracket ( 1 ), a cord winder ( 7 ) connected to the rotating shaft ( 22 ) is arranged on the lower side of the upper beam bracket ( 1 ), and a rotating drum ( 71 ) and a coil spring ( 72 ) are arranged inside the cord winder ( 7 ), the rotating drum ( 71 ) is sleeved on the rotating shaft ( 22 ) and rotates synchronously with the rotating shaft ( 22 ), and a pull-out end of the coil spring ( 72 ) is connected to the rotating drum ( 71 ).

10 . The blind cord resistance adjustment structure according to claim 9 , further comprising a first mounting bracket ( 42 ) and a second mounting bracket ( 43 ), wherein the first mounting bracket ( 42 ) and the second mounting bracket ( 43 ) are respectively arranged at two ends of the upper beam bracket ( 1 ), the first mounting bracket ( 42 ) is threadedly connected with a mounting screw rod ( 44 ), one end of the mounting screw rod ( 44 ) close to an external first wall surface ( 4101 ) is connected with a first fixing block ( 45 ), the mounting screw rod ( 44 ) is circumferentially rotatable relative to the first fixing block ( 45 ), and a first anti-slip pad ( 46 ) is arranged on a side of the first fixing block ( 45 ) close to the first wall surface ( 4101 ); the second mounting bracket ( 43 ) is provided with a second fixing block ( 47 ) and a first elastic member ( 48 ), the second fixing block ( 47 ) is slidably arranged on the second mounting bracket ( 43 ) along an axial direction of the second fixing block, the first elastic member ( 48 ) is arranged between the second mounting bracket ( 43 ) and the second fixing block ( 47 ), and a second anti-slip pad ( 49 ) is provided on a side of the second fixing block ( 47 ) close to an external second wall surface ( 4102 ); during installation, the elastic force of the first elastic member ( 48 ) drives the second fixing block ( 47 ) to slide toward the second wall surface ( 4102 ), so that the second anti-slip pad ( 49 ) abuts against the second wall surface ( 4102 ); the mounting screw rod ( 44 ) is rotated by an external force, so that the mounting screw rod ( 44 ) drives the first fixing block ( 45 ) to move toward the first wall surface ( 4101 ), and the second mounting bracket ( 43 ) moves toward the second fixing block ( 47 ) until the second mounting bracket ( 43 ) abuts against the second fixing block ( 47 ), causing the first anti-slip pad ( 46 ) to press tightly against the first wall surface ( 4101 ) and the second anti-slip pad ( 49 ) to press tightly against the second wall surface ( 4102 ), thereby securing the upper beam bracket ( 1 ) between the first wall ( 4101 ) and the second wall ( 4102 ).

11 . The blind cord resistance adjustment structure according to claim 10 , wherein the first elastic member ( 48 ) is a first compression spring, one end of the first elastic member ( 48 ) abuts against the second fixing block ( 47 ), and the other end of the first elastic member ( 48 ) abuts against the second mounting bracket ( 43 ); before installation, the elastic force of the first elastic member ( 48 ) drives one end of the second fixing block ( 47 ) provided with the second anti-slip pad ( 49 ) to extend out of the second mounting bracket ( 43 ); the second mounting bracket ( 43 ) is provided with a first positioning column ( 431 ) for fitting and positioning the other end of the first compression spring, and the second fixing block ( 47 ) is provided with a second positioning column ( 471 ) for fitting and positioning the one end of the first compression spring; after installation, the first positioning column ( 431 ) abuts against the second positioning column ( 471 ); the mounting screw rod ( 44 ) is provided with an external thread ( 4401 ), and the first mounting bracket ( 42 ) is provided with an internal thread ( 4201 ) matching the external thread ( 4401 ).

12 . The blind cord resistance adjustment structure according to claim 10 , wherein the first fixing block ( 45 ) is provided with a first insertion column ( 4501 ), and the mounting screw rod ( 44 ) is provided with a first insertion recess ( 4402 ) engageable with the first insertion column ( 4501 ); the first mounting bracket ( 42 ) is provided with a limiting block ( 4202 ) for limiting the rotation of the first fixing block ( 45 ); a plane bearing ( 410 ) is provided between the mounting screw rod ( 44 ) and the first fixing block ( 45 ); the first anti-slip pad ( 46 ) is made of silicone, rubber, or foam, and the second anti-slip pad ( 49 ) is made of silicone, rubber, or foam.

13 . The blind cord resistance adjustment structure according to claim 10 , wherein an adjustment block ( 4403 ) is provided at one end of the mounting screw rod ( 44 ), a longitudinal section of the adjustment block ( 4403 ) is in a shape of a regular polygon, a plurality of first recesses ( 4404 ) are provided on the adjustment block ( 4403 ), and the first recesses ( 4404 ) are in an I-shape; the mounting screw rod ( 44 ), the first fixing block ( 45 ), the first anti-slip pad ( 46 ), the second fixing block ( 47 ) and the second anti-slip pad ( 49 ) are all located on the lower side of the upper beam bracket ( 1 ).

14 . The blind cord resistance adjustment structure according to claim 1 , further comprising a cord buckle body ( 52 ) and a rotating component ( 53 ), wherein the rotating component ( 53 ) is arranged on the cord buckle body ( 52 ), one end of the blind cord ( 4 ) is connected to the rotating component ( 53 ), the cord buckle body ( 52 ) and the rotating component ( 53 ) are movably engaged, the rotating component ( 53 ) is switchable between a locked state and an unlocked state, and the rotating component ( 53 ) is rotatable in the unlocked state; a locking mechanism is arranged between the cord buckle body ( 52 ) and the rotating component ( 53 ), and the locking mechanism comprises a second elastic member ( 54 ) arranged between the cord buckle body ( 52 ) and the rotating component ( 53 ); in a normal state, the rotating component ( 53 ) is driven to engage with the cord buckle body ( 52 ) by the elastic force of the second elastic member ( 54 ), so that the rotating component ( 53 ) is in the locked state in which the rotating component ( 53 ) cannot be rotated; during adjustment, the rotating component ( 53 ) is driven by an external force to disengage from the cord buckle body ( 52 ), so that the rotating component ( 53 ) is in the unlocked state; the rotating component ( 53 ) is rotated in a forward direction by an external force to wind the blind cord ( 4 ) onto the rotating component ( 53 ); and the rotating component ( 53 ) is rotated in a reverse direction by an external force to release the blind cord ( 4 ) from the rotating component ( 53 ).

15 . The blind cord resistance adjustment structure according to claim 14 , wherein the rotating component ( 53 ) is slidably arranged on the cord buckle body ( 52 ) along an axial direction of the rotating component ( 53 ), and the locking mechanism further comprises at least one second positioning tooth ( 5301 ) and a second positioning groove ( 5201 ) corresponding to and engageable with the second positioning tooth ( 5301 ), the second positioning tooth ( 5301 ) is arranged on the rotating component ( 53 ), and the rotating component ( 53 ) is arranged on the cord buckle body ( 52 ); in a normal state, the elastic force of the second elastic member ( 54 ) drives the second positioning tooth ( 5301 ) to engage with the second positioning groove ( 5201 ), so that the rotating component ( 53 ) and the cord buckle body ( 52 ) are engaged; during adjustment, the rotating component ( 53 ) is driven to slide along the axial direction by an external force, so that the second positioning tooth ( 5301 ) is disengaged from the second positioning groove ( 5201 ), thereby disengaging the rotating component ( 53 ) from the cord buckle body ( 52 ).

16 . The blind cord resistance adjustment structure according to claim 15 , wherein a plurality of second positioning teeth ( 5301 ) are evenly distributed along a rotation direction of the rotating component ( 53 ), a plurality of second positioning grooves ( 5201 ) are evenly distributed along the rotation direction of the rotating component ( 53 ), and a number of the second positioning grooves ( 5201 ) is greater than or equal to a number of the second positioning teeth ( 5301 ).

17 . The blind cord resistance adjustment structure according to claim 15 , wherein the rotating component ( 53 ) comprises a rotating rod ( 531 ) and an end cover ( 532 ) connected to one end of the rotating rod ( 531 ), the rotating rod ( 531 ) and the end cover ( 532 ) rotate and slide synchronously, the second elastic member ( 54 ) abuts between the rotating rod ( 531 ) and the cord buckle body ( 52 ), the second positioning tooth ( 5301 ) is arranged on the end cover ( 532 ), and a manual knob ( 5302 ) is arranged at one end of the rotating component ( 53 ); during adjustment, the manual knob ( 5302 ) is rotated by an external force to drive the rotating component ( 53 ) to rotate.

18 . The blind cord resistance adjustment structure according to claim 14 , wherein the cord buckle body ( 52 ) is provided with an inner cavity ( 5202 ) for mounting the rotating component ( 53 ), the cord buckle body ( 52 ) is provided with a third through-hole ( 5203 ) and a fourth through-hole ( 5204 ) which are communicated with the inner cavity ( 5202 ), and the rotating component ( 53 ) is provided with a fifth through-hole ( 5303 ); when mounting the blind cord ( 4 ), one end of the blind cord ( 4 ) passes through the third through-hole ( 5203 ), the fifth through-hole ( 5303 ) and the fourth through-hole ( 5204 ) in sequence; a limiting portion ( 5101 ) is provided at a position where the blind cord ( 4 ) passes through the fourth through-hole ( 5204 ), a diameter of the limiting portion ( 5101 ) is greater than a diameter of the fifth through-hole ( 5303 ), and the diameter of the limiting portion ( 5101 ) is smaller than a diameter of the fourth through-hole ( 5204 ), so that the limiting portion ( 5101 ) passes through the fourth through-hole ( 5204 ) and is limited by the fifth through-hole ( 5303 ); and a second recess ( 5304 ) for limiting the limiting portion ( 5101 ) is provided on the rotating component ( 53 ).

19 . The blind cord resistance adjustment structure according to claim 14 , further comprising a lower beam bracket ( 55 ), wherein two cord buckle bodies ( 52 ) and two blind cords ( 4 ) are provided, and the cord buckle bodies ( 52 ) are fixedly connected to the lower beam bracket ( 55 ); each cord buckle body ( 52 ) is provided with a corresponding rotating component ( 53 ); the second elastic member ( 54 ) is a second compression spring, one end of the second elastic member ( 54 ) is in contact with a corresponding cord buckle body ( 52 ), and the other end of the second elastic member ( 54 ) is in contact with the corresponding rotating component ( 53 ).

20 . A blind, comprising the blind cord resistance adjustment structure according to claim 1 .