CN217783369U - Venetian blind - Google Patents

Abstract

The embodiment of the utility model provides a venetian blind, which comprises blades, a lower beam, a base, an angle adjusting mechanism assembled on the base and used for adjusting the angle of the blades and a lifting mechanism driving the blades and the lower beam to lift, wherein the angle adjusting mechanism comprises a sleeve pivoted on the base, a power assembly driving the sleeve to rotate and a ladder belt, the top end of the ladder belt is sleeved outside the sleeve, and the bottom end of the ladder belt is connected with the blades to drive the blades to twist in angle; the lifting mechanism comprises a rope winding drum screwed and fixed at one end of the base and a bearing rope which is fixed on the lower beam after penetrating through the blades and the top end of which is wound along the external thread on the rope winding drum in sequence; the sleeve inner wall is equipped with axially extending's transmission sand grip, corresponds on the wiring section of thick bamboo outer wall and is equipped with the recess, and the groove width of recess is greater than the width of transmission sand grip, and the transmission sand grip corresponds with the recess and pegs graft and can drive the rotation of wiring section of thick bamboo when the sleeve is rotatory to the transmission sand grip and supports the lateral wall of recess. In the embodiment, the blade angle adjustment and the curtain lifting adjustment can be realized by controlling the rotating angle of the sleeve.

Description

Venetian blind

Technical Field

The embodiment of the utility model provides a relate to (window) curtain technical field, especially relate to a venetian blind.

Background

A window blind generally includes a plurality of parallel blades, a lower beam disposed below the blades, a base disposed above the blades, an angle adjusting mechanism assembled on the base and connected to the blades to adjust the angle of the blades, and a lifting mechanism assembled on the base to bear the blades and the lower beam and drive the blades and the lower beam to lift.

However, in specific implementation, in order to avoid mutual interference, the angle adjusting mechanism and the lifting mechanism are generally required to be separately and independently disposed on the base, the existing base is difficult to simultaneously bear and assemble two large components of the angle adjusting mechanism and the lifting mechanism due to size limitation, redesigning and manufacturing the large-sized base increases design and material costs, and meanwhile, the angle adjusting mechanism and the lifting mechanism are required to be respectively provided with a driving device, so that the structure is complicated and redundant, and further, the production cost is further increased, and inconvenience in use is also caused.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a technical problem who solves provides a blind, is connected the angle modulation of blade and the lift adjustment transmission of (window) curtain as an organic whole, saves the base space, and the while simplified operation.

In order to solve the technical problem, an embodiment of the utility model provides a following technical scheme: a venetian blind comprises a plurality of blades arranged in parallel, a lower beam arranged below the blades, a base arranged above the blades, an angle adjusting mechanism assembled on the base and connected with the blades to adjust the angle of the blades, and a lifting mechanism assembled on the base to bear the blades and the lower beam and drive the blades and the lower beam to lift, wherein the angle adjusting mechanism comprises a sleeve pivoted on the base and provided with a ladder belt groove on the outer wall, a power assembly used for driving the sleeve to rotate, and a ladder belt of which the top end is sleeved in the ladder belt groove and the bottom end is connected with each blade so as to drive the blades to rotate by corresponding angles when rotating along with the sleeve, the lifting mechanism comprises a rope winding barrel of which the outer side wall is provided with external threads and screwed with screw holes arranged at one end of the base, and a bearing rope of which the bottom end part penetrates through each blade in sequence and then is fixed on the lower beam and the top end part is spirally wound along the thread grooves of the external threads on the rope winding barrel in sequence; the rope winding drum is coaxially inserted into the sleeve, a transmission convex strip extending along the axial direction is arranged on the inner wall of the sleeve, a groove is correspondingly formed in the outer wall of the rope winding drum, the groove width of the groove is larger than the width of the transmission convex strip, the transmission convex strip is correspondingly inserted into the groove, and the rope winding drum can be driven to rotate when the sleeve rotates to the state that the transmission convex strip abuts against the side wall of the groove.

Furthermore, the two opposite sides of the base are respectively provided with elastic clamping arms which are matched with each other to form a clamping space in a protruding mode, the sleeve passes over the tail ends of the elastic clamping arms and is correspondingly clamped in the clamping space and is elastically clamped by the elastic clamping arms so as to be pivoted with the base, and the tail end of at least one elastic clamping arm also protrudes towards the opposite side of the base to form a backstop portion for preventing the sleeve from being pulled out of the clamping space; still the shaping have on the telescopic lateral wall at least one with elasticity card arm looks joint and prevent the sleeve is relative in the axial the joint groove that the base removed, the groove width in joint groove with the width looks adaptation of elasticity card arm, elasticity card arm corresponds the card and establishes the joint inslot.

Furthermore, one side of the elastic clamping arm, which is in contact with the sleeve, is also concave to form a cambered surface recess matched with the outer side wall of the sleeve.

Further, a stopper is further arranged on the side wall of one end, far away from the base, of the rope winding drum in a protruding mode along the radial direction, and a stroke limiting block used for being abutted to the stopper in the circumferential direction to limit the maximum stroke of the rope winding drum inserted into the sleeve in the axial direction is arranged on the base in a protruding mode outside the outer end hole of the screw hole in the protruding mode.

Further, the blind further comprises an upper beam, the base is fixed to the middle section of the upper beam, and the power assembly is fixed to one end of the upper beam.

Furthermore, the power assembly comprises an annular operating rope for being pulled by an operator in two directions, a transmission gear set, a middle rotating shaft and a transmission shaft rod, wherein the input end of the transmission gear set is used for being sleeved with the operating rope to rotate under the driving of the operating rope, one end of the middle rotating shaft is relatively fixed with the outer end of an output shaft of the transmission gear set, the transmission shaft rod is relatively fixed with the other end of the middle rotating shaft, and the transmission shaft rod penetrates through the rope winding barrel and is relatively fixed with one end, far away from the screw hole, of the sleeve in the circumferential direction.

Furthermore, a transmission hole is formed in one end, far away from the screw hole, of the sleeve, the transmission shaft rod penetrates through the transmission hole, the cross sections of the transmission shaft rod and the transmission hole are similar and non-circular, and the transmission shaft rod and the transmission hole are in tolerance fit.

Furthermore, a first inserting portion is formed at the axis of the outer end of the output shaft, a first arc blocking piece coaxial with the first inserting portion is arranged on the outer side of the first inserting portion, a second inserting portion is formed at the axis of one end, butted with the output shaft, of the middle rotating shaft, a second arc blocking piece coaxial with the second inserting portion is further arranged outside the second inserting portion, the output shaft and the middle rotating shaft are correspondingly inserted through the first inserting portion and the second inserting portion, the first arc blocking piece and the second arc blocking piece are arranged in a concentric staggered mode, and a circumferential gap is formed between corresponding side edges of the first arc blocking piece and the second arc blocking piece; the power assembly further comprises a torsional spring, the torsional spring sleeve is arranged between the first arc separation blade and the second arc separation blade, the two positioning feet are arranged outside the first arc separation blade and the second arc separation blade and are respectively inserted into the circumferential gap, the circumferential width of the circumferential gap is larger than the width of the positioning feet of the torsional spring, and one positioning foot of the torsional spring supports the first arc separation blade and the other positioning foot supports the second arc separation blade.

Furthermore, a nut is assembled at one end of the base, a central hole of the nut forms the screw hole, caulking grooves are respectively arranged at two opposite sides of one end of the base, and two opposite sides of the nut are correspondingly fixed in the caulking grooves in a clamping and embedding manner.

Furthermore, a rope threading hole for the bearing rope to pass through and position the bearing rope is further formed in the bottom of the inner wall of the central hole of the nut, a through groove for the bearing rope to pass through is further formed in the base corresponding to the rope threading hole, and a rope head fixing hole for fixing the tail end of the top end portion of the bearing rope is further formed in one end, far away from the base, of the rope winding drum.

After the technical scheme is adopted, the embodiment of the utility model provides an at least, following beneficial effect has: the embodiment of the utility model provides a lateral wall through the wire winding section of thick bamboo in elevating system sets up the external screw thread and supplies to pass each in proper order the blade after-fixing in bear the weight of rope spiral winding in proper order on the underbeam, guarantees the smooth and easy nature of curtain lift, just base one end is provided with the screw, the wire winding section of thick bamboo with one end spiro union in the screw and be fixed in on the base, just the wire winding section of thick bamboo spiro union is passed the part of screw still inserts coaxially in the sleeve, the sleeve inner wall is equipped with along axially extended transmission sand grip, correspond on the wire winding section of thick bamboo outer wall and be equipped with the recess, by the transmission sand grip correspond peg graft in the recess and make the wire winding section of thick bamboo is followed sleeve synchronous revolution, and then the guide bear the rope carry out orderly spiral winding on the wire winding section of thick bamboo and drive the lift of blade and underbeam, and set up again the groove width of recess is greater than the width of transmission sand grip, promptly the transmission sand grip can produce relative movement in the recess, consequently the sleeve slightly rotates and make the transmission sand grip not with the arbitrary lateral wall counterbalance within range of the scope that meets of recess, can carry out blade angle adjustment operation, from this the blade adjustment mechanism, the effective control of the angle that the window curtain that only needs, the effective control blade adjustment structure, the effective cost of the lift control mechanism that the window curtain, the window shutter that realizes.

Drawings

Fig. 1 is a schematic view of an alternative embodiment of the venetian blind of the present invention in a disassembled state.

Fig. 2 is a schematic view of an alternative embodiment of the venetian blind of the present invention.

Fig. 3 is a schematic structural view of a rope drum at the maximum stroke position of an alternative embodiment of the venetian blind of the present invention.

Fig. 4 is a schematic view illustrating a state where the sleeve, the rope reel and the base of the venetian blind of the present invention are detached from each other.

Fig. 5 is a cross-sectional view of a catching groove of a sleeve according to an alternative embodiment of the present invention.

Fig. 6 is a cross-sectional view of an alternative embodiment of the window blind of the present invention through the axial plane of the cord reel.

Fig. 7 is a schematic perspective view of a sleeve according to an alternative embodiment of the present invention.

Fig. 8 is a schematic view of the power assembly of an alternative embodiment of the window blind of the present invention in a disassembled state.

Fig. 9 is a schematic perspective view of an upper beam of an alternative embodiment of the window blind of the present invention.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings and specific examples. It is to be understood that the following illustrative embodiments and description are only intended to illustrate the present invention, and are not intended to limit the present invention, and features in the embodiments and examples may be combined with each other in the present application without conflict.

As shown in fig. 1 to 9, an alternative embodiment of the present invention provides a venetian blind, including a plurality of parallel blades 1, a lower beam 2 disposed below the blades 1, a base 3 disposed above the blades 1, an angle adjusting mechanism 4 assembled on the base 3 and connected to the blades 1 for adjusting the angle of the blades 1, and a lifting mechanism 5 assembled on the base 3 for supporting the blades 1 and the lower beam 2 and driving the blades 1 and the lower beam 2 to lift, wherein the angle adjusting mechanism 4 includes a sleeve 41 pivoted on the base 3 and having a ladder strap slot 410 on the outer wall, a power assembly 43 for driving the sleeve 410 to rotate, and a ladder strap 45 having a top end sleeved in the ladder strap slot 410 and a bottom end connected to each of the blades 1 and driving the blades 1 to rotate by a corresponding angle when rotating along with the sleeve 41, the lifting mechanism 5 includes a rope winding barrel 50 having an outer side wall provided with an external thread 501, a bottom end portion screwed to a screw hole 301 disposed at one end of the base 3, and a spiral rope winding barrel 52 having a bottom end portion sequentially passing through each of the blade 1 and then fixed to the lower beam 2 and winding barrel along the external thread 501; the rope winding drum 50 is coaxially inserted into the sleeve 41, the inner wall of the sleeve 41 is provided with a transmission convex strip 412 extending along the axial direction, the outer wall of the rope winding drum 50 is correspondingly provided with a groove 503, the groove width of the groove 503 is larger than the width of the transmission convex strip 412, the transmission convex strip 412 is correspondingly inserted into the groove 53, and the rope winding drum 50 can be driven to rotate when the sleeve 41 rotates until the transmission convex strip 412 abuts against the side wall of the groove 503.

In the embodiment of the present invention, the outer sidewall of the rope winding drum 50 in the lifting mechanism 5 is provided with the external thread 501 for sequentially passing through the bearing rope 52 fixed on the lower beam 2 after each blade 1 to be spirally wound, thereby ensuring the smoothness of the lifting of the curtain, one end of the base 3 is provided with the screw hole 301, the rope winding drum 50 is fixed on the base 3 by screwing one end into the screw hole 301, the part of the rope winding drum 50 screwed through the screw hole 301 is coaxially inserted into the sleeve 41, the inner wall of the sleeve 41 is provided with the transmission convex strip 412 extending along the axial direction, the outer wall of the rope winding drum 50 is correspondingly provided with the groove 503, the transmission convex strip 412 is correspondingly inserted into the groove 503, so that the rope winding drum 50 follows the sleeve 41 to synchronously rotate, and further, the bearing rope 52 is guided to be orderly spirally wound and retracted on the rope winding drum 50 to drive the blades 1 and the lower beam 2 to ascend and descend, and the groove width of the groove 503 is set to be larger than the width of the transmission convex strip 412, namely, the transmission convex strip 412 can move relatively in the groove 503, so that the angle adjustment operation of the blades 1 can be carried out in the range that the sleeve 41 slightly rotates to ensure that the transmission convex strip 412 is not abutted against any side wall of the groove 503, and the rotation angle of the sleeve 41 in the blade angle adjusting mechanism 4 is driven by only one power assembly 43 to realize the angle adjustment of the blades 1 and the ascending and descending adjustment of the window curtain.

In yet another alternative embodiment of the present invention, as shown in fig. 3-5, two opposite sides of the base 3 are respectively protruded with elastic clipping arms 32 that cooperate with each other to form a clipping space, the sleeve 41 is clipped into the clipping space correspondingly beyond the ends of the elastic clipping arms 32 and elastically clipped by the elastic clipping arms 32 to be pivoted with the base 3, the end of at least one of the elastic clipping arms 32 is protruded toward the opposite side of the base 3 to form a stopping portion 321 that prevents the sleeve 41 from being released from the clipping space; at least one clamping groove 414 is formed on the outer side wall of the sleeve 41, the clamping groove 414 is clamped with the elastic clamping arm 32 to prevent the sleeve 41 from moving relative to the base 3 in the axial direction, the groove width of the clamping groove 414 is matched with the width of the elastic clamping arm 32, and the elastic clamping arm 32 is correspondingly clamped in the clamping groove 414. In this embodiment, the elastic clamping arms 32 protrude from two opposite sides of the base 3 respectively, so that the sleeve 41 is elastically clamped in the clamping space formed by the elastic clamping arms 32 and is pivoted on the base 3, in addition, the stopping portion 321 is arranged at the end of at least one elastic clamping arm 32 to prevent the sleeve 41 from being disengaged, and at least one clamping groove 414 with a groove width matched with the width of the elastic clamping arm 32 is formed on the outer side wall of the sleeve 41 to allow the elastic clamping arm 32 to be clamped and fixed in the groove, so as to prevent the sleeve 41 from moving relative to the base 3 in the axial direction, thereby ensuring the stability of the splicing and matching between the sleeve 41 and the rope winding drum 50. In specific implementation, the elastic clamping arms 32 can be symmetrically arranged on two sides of the base 3, and two sides of the sleeve 41 are uniformly stressed, so that the limiting effect is good; the elastic clip arms 32 may also be disposed asymmetrically, for example, two elastic clip arms 32 are disposed on one side of the base 3, and a third elastic clip arm 32 is disposed in the middle of the two elastic clip arms 32 on the opposite side, so as to also realize the clip fixing of the sleeve 41.

In another alternative embodiment of the present invention, as shown in fig. 4, one side of the elastic latch arm 32 contacting the sleeve 41 is further recessed to form a cambered recess 323 matching with the outer sidewall of the sleeve 41. This embodiment is through contacting at elasticity card arm 32 one side of sleeve 41 still the indent form with the cambered surface 323 of the outer side wall adaptation of sleeve 41 to cambered surface adaptation joint guarantees that the joint gets into the rotatory smooth and easy degree of sleeve 41 in the centre gripping space reduces the loss of power among the power transmission process, improves the transmission efficiency between sleeve 41 and the rope winding section of thick bamboo 50.

In yet another alternative embodiment of the present invention, as shown in fig. 1 and 4, the rope winding drum 50 is further provided with a stopper 505 protruding radially on the side wall of the end far away from the base 3, and the base 3 is further provided with a stroke stopper 34 protruding outside the outer end hole of the screw hole 301 for abutting against the stopper 505 in the circumferential direction to limit the maximum stroke of the rope winding drum 50 inserted axially into the sleeve 41. In the present embodiment, the stopper 505 is provided to protrude from the sidewall of the end of the rope drum 50 away from the base 3 in the radial direction, the base 3 is provided with the stroke stopper 34 protruding from the outside of the threaded hole 301 to abut against the stopper 505 in the circumferential direction, so that the maximum stroke of the rope drum 50 inserted into the sleeve 41 in the axial direction is limited, the rope drum 41 is prevented from being unscrewed from the threaded hole 301 due to over-screwing, and the load-bearing rope 52 can be wound on the rope drum 50 in order.

In yet another alternative embodiment of the present invention, as shown in fig. 1 and 9, the window blind further comprises an upper beam 6, the base 3 is fixed to the middle section of the upper beam 6, and the power assembly 43 is fixed to one end of the upper beam 6. The blind is further provided with an upper beam 6 in the embodiment, the middle part of the upper beam 6 is used for fixedly installing the base 3, and one end part of the upper beam 6 is used for fixedly assembling the power assembly 43, so that the structure is simple, and the installation is convenient. In the specific implementation process, a through hole 61 through which the carrying rope 52 and the ladder tape 45 are threaded is formed in the bottom wall of the upper beam 6.

In another optional embodiment of the present invention, as shown in fig. 1 and 8, the power assembly 43 includes an operation rope 430 that is in a ring shape and is pulled by an operator in two directions, a transmission gear set 432 that an input end 4321 is provided for the operation rope 430 to be sleeved so as to rotate under the driving of the operation rope 430, a middle rotating shaft 433 that one end is fixed relatively to an outer end of an output shaft 4323 of the transmission gear set 432, and a transmission shaft 434 that is fixed relatively to the other end of the middle rotating shaft 433, where the transmission shaft 434 passes through the rope winding drum 50 and is fixed relatively to an end of the sleeve 41 that is far away from the screw hole 301 in a circumferential direction. In the embodiment shown in fig. 8, the transmission gear set 432 is a planetary gear mechanism, one end of a sun gear 4320 in the planetary gear mechanism is coaxially provided with a reel as the input end 4321 for the operation rope 430 to be sleeved, so that the sun gear 4320 can rotate under the pulling of the operation rope 430, and a planet carrier of the planetary gear mechanism for the planet gear 4322 to be pivoted is circumferentially fixed with the middle rotating shaft 433 as an output shaft 4323, so that when the operation rope 430 is pulled, the large sun gear 4320 rotates synchronously, so that the planet carrier 4324 rotates correspondingly, and then the rotary power is transmitted to the transmission shaft 434 through the output shaft 4323, thereby realizing the rotary driving of the transmission shaft 434.

In yet another alternative embodiment of the present invention, as shown in fig. 5-7, a driving hole 416 is formed at an end of the sleeve 41 away from the screw hole 301, the driving shaft lever 434 is inserted into the driving hole 416, the cross sections of the driving shaft lever 434 and the driving hole 416 are similar non-circular, and the driving shaft lever 434 and the driving hole 416 are tolerance fit. In this embodiment, a transmission hole 416 is formed at one end of the sleeve 41 far away from the screw hole 301, so as to allow the transmission shaft 434 to pass through, the cross sections of the transmission shaft 434 and the transmission hole 416 are similar non-circular, so as to realize transmission connection between the sleeve 41 and the transmission shaft 434, and the transmission shaft 434 and the transmission hole 416 are in tolerance fit, thereby improving assembly precision and ensuring transmission connection stability. In particular implementations, the cross-section of the drive shaft 434 and the drive bore 416 can be hexagonal, pentagonal, quadrilateral, elliptical, triangular, etc.

In a further optional embodiment of the present invention, as shown in fig. 1 and 8, a first inserting portion 4323a is formed at an outer end axis of the output shaft 4323, a first circular arc blocking piece 4323b coaxial with the first inserting portion 4323a is disposed outside the first inserting portion 4323a, a second inserting portion 4330 is formed at an axis of one end of the middle rotating shaft 433 abutting against the output shaft 4323, a second circular arc blocking piece 4332 coaxial with the second inserting portion 4330 is further disposed outside the second inserting portion 4330, the output shaft 4323 and the middle rotating shaft 433 are correspondingly inserted through the first inserting portion 4323a and the second inserting portion 4330, the first circular arc blocking piece 4323b and the second circular arc blocking piece 4332 are concentrically disposed in a staggered manner, and a circumferential gap is respectively formed between corresponding side edges of the first circular arc blocking piece 4323a and the second circular arc blocking piece 4332; the power assembly 43 further includes a torsion spring 436, the torsion spring 436 is sleeved outside the first circular arc barrier 4323a and the second circular arc barrier 4332, and two positioning legs 4361 are respectively inserted into the circumferential gap, the circumferential width of the circumferential gap is greater than the width of the positioning leg 4361 of the torsion spring 436, one positioning leg 4361 of the torsion spring 436 abuts against the first circular arc barrier 4323b, and the other positioning leg 4361 abuts against the second circular arc barrier 4332.

In this embodiment, the output shaft 4323 and the middle rotating shaft 433 are respectively butted by a first plugging portion 4323a and a second plugging portion 4330, a first arc blocking piece 4323b at the periphery of the first plugging portion 4323a and a second arc blocking piece 4332 at the periphery of the second plugging portion 4330 are spliced in a staggered and concentric circle, a torsion spring 436 is sleeved at the butted position of the output shaft 4323 and the middle rotating shaft 433 and is positioned by inserting a positioning pin 4361 thereon into the butted gap of the first arc blocking piece 4323b and the second arc blocking piece 4332, the output shaft 4323 and the middle rotating shaft 433 are connected by the torsion spring 436 in a transmission manner, and in the transmission process, the torsion spring 436 can convert a part of kinetic energy into elastic potential energy, thereby preventing the external force from being too violent to damage the spliced position of the output shaft 4323 and the middle rotating shaft 433. In specific implementation, the first inserting portion 4323a may be configured as a circular hole, the second inserting portion 4330 is a circular shaft rod correspondingly inserted into the circular hole, and the circular hole and the circular shaft rod may be configured in an interchangeable manner.

In another alternative embodiment of the present invention, as shown in fig. 1, 3 and 4, a nut 30 is assembled at one end of the base 3, the central hole of the nut 30 forms the screw hole 301, two opposite sides of one end of the base 3 are respectively provided with an embedding groove 36, and two opposite sides of the nut 30 are correspondingly embedded and fixed in the embedding grooves 36. In the embodiment, the nut 30 is assembled at one end of the base 3, the central hole of the nut 30 is used as the screw hole 301 which is in threaded fit with the external thread 501 on the outer side wall of the rope winding drum 50, and the screw hole 301 is independent of the base 3, so that the maintenance and the replacement in the subsequent use process are facilitated; in addition, the two opposite sides of one end of the base 3 are respectively provided with an embedding groove 36, and the nut 30 is fixed at one end of the base 3 by correspondingly clamping and embedding the two opposite sides in the embedding grooves 36, so that the structure is simple and the assembly and disassembly are convenient.

In still another optional embodiment of the present invention, as shown in fig. 4 and fig. 6, a rope threading hole 303 for the bearing rope 52 to pass through and position the bearing rope 52 is further opened at the bottom of the inner wall of the central hole of the nut 30, a through groove 38 for the bearing rope 52 to pass through is further provided on the base 3 corresponding to the rope threading hole 303, and one end of the rope winding drum 50 far away from the base 3 is further provided with a rope end fixing hole 507 for fixing the end of the top end portion of the bearing rope 52. In the embodiment, the bottom of the inner wall of the central hole of the nut 30 is provided with the rope threading hole 303 for the bearing rope 52 to pass through and position, so that the bearing rope 52 is prevented from being wound and knotted below the rope winding drum 50; a through groove 38 for the bearing rope 52 to pass through is further formed in the base 3 corresponding to the rope threading hole 303, so that the bearing rope 52 can be conveniently routed; in addition, a rope end fixing hole 507 for fixing the tail end of the top end portion of the bearing rope 52 is further formed in one end, away from the base 3, of the rope winding drum 50, the bearing rope 52 can be sequentially and spirally wound in the external thread 501 of the outer side wall of the rope winding drum 50 along with the fact that the rope winding drum 50 exits from the screw hole 301, the bearing rope 52 is prevented from being clamped and knotted in the screw hole 301, and the lifting smoothness of the blind is guaranteed.

The embodiments of the present invention have been described with reference to the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, and these forms are within the scope of the present invention.

Claims (10)

1. A venetian blind comprises a plurality of blades arranged in parallel, a lower beam arranged below the blades, a base arranged above the blades, an angle adjusting mechanism assembled on the base and connected with the blades to adjust the angle of the blades, and a lifting mechanism assembled on the base to bear the blades and the lower beam and drive the blades and the lower beam to lift, wherein the angle adjusting mechanism comprises a sleeve pivoted on the base and provided with a ladder belt groove on the outer wall, a power assembly used for driving the sleeve to rotate, and a ladder belt of which the top end is sleeved in the ladder belt groove and the bottom end is connected with each blade so as to drive the blades to rotate corresponding angles when rotating along with the sleeve, and the venetian blind is characterized in that the lifting mechanism comprises a rope winding barrel of which the outer side wall is provided with external threads and is screwed with a screw hole arranged at one end of the base, and a bearing rope of which the bottom end is fixed on the lower beam after sequentially penetrating through each blade and the top end is sequentially and spirally wound along a thread groove of the external threads on the rope winding barrel; the rope winding drum is coaxially inserted into the sleeve, a transmission convex strip extending along the axial direction is arranged on the inner wall of the sleeve, a groove is correspondingly arranged on the outer wall of the rope winding drum, the groove width of the groove is larger than the width of the transmission convex strip, the transmission convex strip is correspondingly spliced with the groove, and the rope winding drum can be driven to rotate when the sleeve rotates to the state that the transmission convex strip abuts against the side wall of the groove.

2. The window shutter as claimed in claim 1, wherein the opposite sides of the base are respectively protruded with elastic clip arms cooperating with each other to form a clip space, the sleeve passes over the ends of the elastic clip arms to be correspondingly clipped in the clip space and elastically clipped by the elastic clip arms to be pivotally connected to the base, the end of at least one of the elastic clip arms is further protruded toward the opposite side of the base to form a retaining portion for preventing the sleeve from being released from the clip space; still the shaping have on the telescopic lateral wall at least one with elasticity card arm looks joint and prevent the sleeve is relative in the axial the joint groove that the base removed, the groove width in joint groove with the width looks adaptation of elasticity card arm, elasticity card arm corresponds the card and establishes the joint inslot.

3. The window shutter as claimed in claim 2, wherein the side of the elastic clip arm contacting the sleeve is further recessed to form a cambered recess adapted to the outer wall of the sleeve.

4. The window shutter as claimed in claim 1, wherein said rope winding drum is further provided with a stopper projecting in a radial direction on a side wall of an end remote from said base, and said base is further provided with a stopper projecting outside an outer end opening of said screw hole for abutting against said stopper in a circumferential direction to limit a maximum stroke of said rope winding drum inserted into said sleeve in an axial direction.

5. The window shutter of claim 1, further comprising an upper beam, wherein the base is secured to a middle section of the upper beam, and wherein the power assembly is secured to one end of the upper beam.

6. The window blind according to claim 1 or 5, wherein the power assembly comprises an operating rope which is in a ring shape and can be pulled in two directions by an operator, a transmission gear set which is sleeved by the operating rope at an input end to rotate under the driving of the operating rope, a middle rotating shaft with one end fixed relative to the outer end of the output shaft of the transmission gear set, and a transmission shaft rod fixed relative to the other end of the middle rotating shaft, wherein the transmission shaft rod penetrates through the rope winding barrel and is fixed relative to one end of the sleeve far away from the screw hole in the circumferential direction.

7. The window shutter as claimed in claim 6, wherein a driving hole is formed at an end of the sleeve away from the screw hole, the driving shaft is inserted into the driving hole, the cross-sections of the driving shaft and the driving hole are similar and non-circular, and the driving shaft and the driving hole are tolerance fit.

8. The window shutter as claimed in claim 6, wherein a first insertion portion is formed at an outer end axis of the output shaft, a first arc baffle coaxial with the first insertion portion is disposed outside the first insertion portion, a second insertion portion is formed at an axis of an end of the middle rotating shaft abutting against the output shaft, a second arc baffle coaxial with the second insertion portion is further disposed outside the second insertion portion, the output shaft and the middle rotating shaft are correspondingly inserted through the first insertion portion and the second insertion portion, the first arc baffle and the second arc baffle are disposed in a concentric and staggered manner, and a circumferential gap is formed between corresponding sides of the first arc baffle and the second arc baffle; the power assembly further comprises a torsional spring, the torsional spring sleeve is arranged between the first arc separation blade and the second arc separation blade, the two positioning feet are inserted into the circumferential gap respectively, the circumferential width of the circumferential gap is larger than the width of the positioning feet of the torsional spring, one positioning foot of the torsional spring supports the first arc separation blade, and the other positioning foot supports the second arc separation blade.

9. The window blind as claimed in claim 1, wherein a nut is assembled at one end of the base, the central hole of the nut forms the screw hole, two opposite sides of one end of the base are respectively provided with an embedding groove, and two opposite sides of the nut are correspondingly embedded and fixed in the embedding grooves.

10. The window shutter as claimed in claim 9, wherein the bottom of the inner wall of the central hole of the nut is further opened with a rope threading hole for the carrying rope to pass through and position the carrying rope, the base is further opened with a through slot for the carrying rope to pass through corresponding to the rope threading hole, and the rope winding drum is further opened with a rope head fixing hole for fixing the end of the top end of the carrying rope at the end far away from the base.

Images