TWI806741B - Deceleration limit device for roller blinds - Google Patents

Abstract

A deceleration limit device for a roller blind, the deceleration limit device includes a limit deceleration sleeve, a set of A limit deceleration elastic part arranged on one side of the limit deceleration sleeve, a rotator for fixing the other side of the limit deceleration elastic part, a limit stop which is locked with the rotator and drives the rotator to rotate and displace. Swivel, and a fixed shaft for the limit swivel and the rotator to rotate and move inside the limit reduction sleeve; through the fixed shaft, when a roller blind rolls up to the upper limit, the The limit rotating body rotates until it is locked with the rotator and drives the rotator to rotate and displace, so that the rotator drives the limit decelerating elastic member connected and fixed with the rotator to twist the state, so that the roller blind can be rolled up quickly When it reaches the upper limit, it will instantly produce a buffer deceleration effect to reduce impact force and noise.

Description

Deceleration limit device for roller blinds

The invention relates to a deceleration limiting device, in particular to a deceleration limiting device for a roller blind.

There is no suitable upper limit device and lower limit device in the roller blinds in the market. When the curtain of the roller blind is pulled down, it may cause the curtain to be stretched too long; When retracting, the retracting force generated will be too much and turn over to the other side of the upper rail.

Therefore, the industry has designed a roller blind equipped with an upper and lower limit device, and the roller blind can be pulled to the lower limit, especially when the roller blind reaches the upper limit of the retraction, the impact force and noise are large. For example, the Republic of China Patent Publication No. I772122 Roller Blind patent disclosed, please refer to Figure 1 and Figure 2, the roller blind 1 includes an upper rail 11, a roller blind installed on one side of the upper rail 11 Device 12, a limiting device 13 installed on the other side of the upper rail 11, and two fixed brackets 14 for the roller shutter device 12 to be connected to the limiting device 13 and fixed on both sides above the window, respectively. A lower rail 15 arranged below the upper rail 11 at intervals, and a curtain 16 . The user hangs down the lower rail 15 of the curtain 16 to the stop point A of the lower limit, and when the curtain 16 is rolled up, the lower rail 15 of the curtain 16 reaches the stop point A1 of the upper limit. The impact force generated in an instant is large and the noise is also large, and as time passes, the internal parts of the limiting device 13 are damaged.

The main purpose of the present invention is to solve the existing problems arising from the momentary impact force and noise generated when the curtain sheet is rolled up to the upper limit of the lower rail, causing damage to parts inside the limiting device.

In order to achieve the above purpose, the present invention provides a deceleration and limiting device for roller blinds. The deceleration and limiting device includes a limiting and decelerating sleeve, a limiting and decelerating elastic member, a rotator, a limiting swivel, and a fixed shaft parts; wherein the limit reduction sleeve includes a convex cover with a first opening and a protruding rod with a second opening protruding from one side of the convex cover, and the inside of the convex cover and the protruding rod A first chamber communicating with the first opening is formed, a first shaft hole with a first fixing portion is formed in the protruding rod, and a first shaft hole is formed in the protruding rod to communicate with the second opening, the first shaft hole and the first shaft hole. A second chamber with an opening, and a first protrusion protruding from the end of the protruding rod; one side of the limit deceleration elastic member is sleeved on one side of the limit deceleration sleeve, and the other side is fixed on the rotation One side of the device, and telescopic between the limit deceleration sleeve and the rotator; the rotator is fixed on the other side of the limit deceleration elastic member, the rotator includes a protrusion, and relative to the protrusion A locking part on one side of the body, wherein the protrusion has a third opening, and a third chamber communicating with the third opening is formed in the protrusion, and a first chamber is provided at the end of the third chamber. Two protrusions, the second protrusion and the first protrusion are correspondingly locked, and the locking part includes a second shaft hole and an inner part that are separated by a ring protrusion and communicate with the third chamber and the third opening space, a first resisting portion connecting the ring protrusion and the locking portion, and at least one insertion hole formed in the inner space of the locking portion for the other side of the limiting deceleration elastic member to be inserted and positioned, The second shaft hole has a first threaded portion; the limiting swivel is movably screwed to the fixed shaft, the limiting swivel is provided with a third shaft hole having a second threaded portion, and at least one limiting swivel position slot, the two sides of the limit swivel have a second resisting portion and a third resisting portion that are adjacent to the limit slot and are opposite, wherein the second resisting portion of the limit swivel corresponds to the rotation The first resisting portion of the device; the fixed shaft is used for the rotation of the limiting swivel and the rotator and is fixed inside the limiting reduction sleeve. The fixed shaft includes a shaft and a shaft connected to one side of the shaft. The protruding ring body, a third threaded part connected to the protruding ring body and protruding in the opposite direction relative to the shaft rod, and a second fixing part connected to the third threaded part and protruding in the opposite direction relative to the protruding ring body part, wherein the protruding ring body is provided with a fourth resisting part on one side in the direction of the third threaded part, and the fourth resisting part is correspondingly engaged with the third resisting part of the limiting swivel. The three threaded parts engage the second threaded part of the limiting swivel and the first threaded part of the rotator, and the second fixing part engages with the first fixing part correspondingly; through the fixed shaft, a roller blind is provided When the retraction reaches the upper limit position, the limit rotating body rotates to lock with the rotator and drives the rotator to rotate and displace, so that the rotator drives the limit decelerating elastic member connected and fixed with the rotator to twist , so that when the roller blind rolls up to the upper limit, it can instantly produce a buffering and deceleration effect.

Furthermore, the protruding rod has a first rod body connected to one side of the convex cover wall and having an outer diameter smaller than the outer diameter of the convex cover wall, and a first rod body connected to one side of the first rod body and having a screw connection for the position-limiting and decelerating elastic member. A second rod body with an external thread, and a third rod body connected to one side of the second rod body and having an outer diameter smaller than the outer diameter of the second rod body, the outer peripheral edge of the second rod body from one side to the other side The taper is tapered and has an outer diameter larger than that of the first rod.

Furthermore, one side and the other side of the limiting and decelerating elastic member form a first passing space and a second passing space, the first passing space is used for the second rod body to pass through, and the second passing space A space is provided for one side of the rotator to pass through.

Furthermore, a protruding block is provided on the outer periphery of the protruding body of the rotator to form a distance from the engaging portion and limit the position-limiting and decelerating elastic member.

Furthermore, the limiting deceleration elastic member is a spring.

Furthermore, the first resisting portion, the second resisting portion, the third resisting portion and the fourth resisting portion are protrusions.

Furthermore, the first fixing part is a convex body; wherein, the outer surface of the second fixing part has a groove correspondingly engaged and fixed with the first fixing part.

Furthermore, the shaft has a fourth shaft hole and a fixing hole passing through the fourth shaft hole, the fourth shaft hole is a hexagonal hole, and a fixing piece is inserted into the fixing hole on the outer periphery of the shaft to fix .

Through the aforementioned implementation of the present invention, it has the following characteristics compared with the existing ones:

In the present invention, through the fixed shaft of the deceleration and limiting device, when the roller blind rolls up to the upper limit, the limiting swivel rotates to lock with the rotator and drives the rotator to rotate and displace, so that the rotator The device then drives the limit deceleration elastic part connected and fixed with the rotator to twist, and makes the limit deceleration elastic part have a larger torsional elastic force, so that when the roller blind roll is fastened to the upper limit, it can instantly produce buffer deceleration The effect is to reduce impact force and noise, and avoid damage to parts inside the deceleration limiter.

(existing)

1: roller blind

11: On track

12: Roller shutter device

13: Limiting device

14: Fixed bracket

15: Lower rail

16: curtain sheet

A: The stop point of the lower limit

A1: The stop point of the upper limit

(this invention)

2: roller blind

20: on track

21: limit convex body

22: slotting

23: Lower rail

231: channel

3: roller shutter device

30: coil spring

31: fixed column

4: Winding control device

41: The first cam shaft

42: second cam shaft

5: Deceleration limit device

51: Limit reduction sleeve

511: Convex cover wall

512: first opening

513: Convex rod

514: second opening

515: the first rod body

516: second rod body

5161: external thread

5162: The first shaft hole

5163: the first fixed part

517: The third rod body

5171: The first bump

518: The first chamber

519: The second chamber

52: limit deceleration elastic part

521: one side

522: the other side

523: The first wearing space

524:Second Wearing Space

525: Gap

53:Rotator

531:Protrusion

5311: Convex block

5312: Spacing

532: locking part

5321: ring convex body

533: The third opening

534: The third chamber

5341: The second bump

535: Second shaft hole

536: Internal space

5361: jack

537: The first resistance department

538: The first threaded part

54: limit swivel

541: The third shaft hole

542: Second threaded part

543: limit slot

544: The second resistance department

545: The third resistance department

55: Fixed shaft

551: shaft

5511: Fourth shaft hole

5512:Fixer

5513: Fixing hole

552: convex ring body

553: The third threaded part

554: The second fixed part

5541: Groove

555: The Fourth Resistance Department

6: Fixed bracket

61: fixed body

62: stand body

621: Through hole

7: curtain

71: Start end

72: terminal

B: The stop point of the lower limit

C: upper limit

D: The stop point of the upper limit

Figure 1: An exploded perspective view of the roller blind configuration for the Republic of China Patent Publication No. I772122.

Figure 2: It is a three-dimensional schematic diagram of the curtain sheet rolling of the roller blind in Figure 1.

Figure 3: An exploded perspective view of the arrangement of the deceleration and limiting device of the roller blind of the present invention.

Fig. 4: is an assembled perspective view of the roller blind of the present invention.

Fig. 5: is a three-dimensional exploded view of the deceleration limiting device of the present invention.

Figure 6: It is a three-dimensional exploded view of another angle of the deceleration limit device in Figure 5.

Fig. 7: It is a three-dimensional schematic diagram of rolling up the curtain sheet of the roller blind in Fig. 4 .

Fig. 8: It is a schematic diagram showing that the lower rail of the roller blind in Fig. 7 is unfolded to the lower limit position and the limit swivel body is about to rotate.

Figure 9: It is a side view of the engagement of the limiting swivel and the fixed shaft in Figure 8.

Fig. 10: It is the front view of the lower rail of the retracting roller blind in Fig. 7 approaching the upper limit and the limit swivel engaged with the rotator.

Fig. 11: It is a sectional view of engagement of the limiting swivel and the rotator in Fig. 10.

Figure 12: It is a side view of the engagement of the limiting swivel and the rotator in Figure 10.

Fig. 13: It is the front view of the lower rail of the retracting roller blind in Fig. 7 to the upper limit and the engagement of the limit reduction sleeve and the rotator.

Figure 14: It is a cross-sectional view of the engagement of the limit reduction sleeve and the rotator in Figure 13.

Detailed description and technical content of the present invention, now just explain as follows with respect to matching drawing:

Please refer to Fig. 3 and Fig. 4, the present invention provides a deceleration limiting device for a roller blind. In this embodiment, the roller blind 2 includes an upper rail 20, a The side roller blind device 3, one installed in the upper rail 20 and a retraction control device 4 opposite to the side of the roller shutter device 3, one installed in the upper rail 20 and connected to the retraction control device The deceleration limiter 5 on one side of 4, the second is respectively for the roller blind device 3 and the retraction control device 4 to be connected and fixed brackets 6 fixed on both sides above the window, and the first is arranged on the upper rail 20 at intervals. The lower rail 23 below, and a curtain 7. Wherein the upper rail 20 is provided with a limiting convex body 21, the limiting convex body 21 is assembled and fixed for the roller blind device 3, the deceleration limiting device 5 and the retracting control device 4, and on the limiting convex body 21 is provided with a slot 22, and the slot 22 is embedded with a starting end 71 of the curtain 7 and wound on the outer surface of the upper rail 20, so that the curtain 7 is driven by the upper rail 20 to lift. A groove 231 is defined on the surface of the lower rail 23 , and a terminal 72 of the curtain 7 is fixed in the groove 231 .

One side of this roller blind device 3 is provided with a square fixed column 31, and this fixed column 31 is pivoted on this fixed bracket 6 on the left end, and the other side of this roller blind device 3 has a coil spring 30, and this coil The spring 30 will be more and more retracted when the curtain 7 is pulled downward by the rotation of the upper rail 20 . The roller blind device 3 is a known component, and will not be described in detail here.

One side of the retracting control device 4 is provided with a square first protruding shaft 41, the first protruding shaft 41 is pivotally connected to and protrudes from the fixed bracket 6 at the right end, and the other side of the retracting control device 4 is provided with There is a second hexagonal protruding shaft 42. The retraction control device 4 is a known component, and will not be described in detail here.

Referring back to Fig. 3 to Fig. 6 and Fig. 11, the deceleration limiting device 5 includes a deceleration sleeve 51, a set of deceleration elastic parts 52 arranged on one side of the deceleration sleeve 51, a supply for The rotator 53 fixed on the other side 522 of the limit deceleration elastic member 52 forms a lock with the rotator 53 and drives the rotator 53 to rotate. The limit swivel 54 that moves, and a fixed shaft 55 for the limit swivel 54 and the rotator 53 to rotate and to be fixed inside the limit reduction sleeve 51 .

Referring back to Fig. 3 to Fig. 6 and Fig. 11, the limit reduction sleeve 51 includes a convex cover wall 511 with a first opening 512, and a second opening protruding from the side of the convex cover wall 511. A protruding rod 513 of 514, the protruding rod 513 has a first rod body 515 connected to one side of the convex cover wall 511 and whose outer diameter is smaller than the outer diameter of the convex cover wall 511, connected to one side of the first rod body 515 and has A second rod body 516 with an external thread 5161 , and a third rod body 517 connected to one side of the second rod body 516 and having an outer diameter smaller than that of the second rod body 516 . Wherein the convex cover wall 511 and the first rod body 515 form a first chamber 518 communicating with the first opening 512, and the outer peripheral edge of the second rod body 516 tapers from one side to the other side in a tapered shape and The outer diameter is larger than the outer diameter of the first rod body 515, and a first shaft hole 5162 with a first fixing part 5163 is formed in the second rod body 516, and a first shaft hole 5162 with a first fixing part 5163 is formed in the third rod body 517 to communicate with the second rod body. The opening 514 , the first shaft hole 5162 and a second chamber 519 of the first opening 512 , and a first protrusion 5171 protrudes from the end of the third rod 517 . In one embodiment, the first fixing portion 5163 is a convex body.

Referring back to Figures 3 to 6 and cooperating with Figures 11 and 14, one side 521 of the limiting deceleration elastic member 52 is sleeved on the first rod body 515 of the protruding rod 513 and abuts against the protruding rod 513. On the cover wall 511, the other side 522 is fixed on one side of the rotator 53, and expands and contracts between the limit reduction sleeve 51 and the rotator 53, through the one side 521 of the limit deceleration elastic member 52 and the other side 522 to form a first piercing space 523 and a second piercing space 524, the first piercing space 523 for the second rod body 516 to penetrate, the second piercing space 524 for the rotator 53 One side threaded. The limit deceleration elastic member 52 is a spring in this embodiment, and a gap 525 is formed between each coil of the spring. The compression also has the buffering and decelerating force to assist the roller blind 2 when it is rolled up, and makes the position-limiting and decelerating elastic member 52 have a relatively large torsional elastic force. In this embodiment, the limiting and decelerating elastic member 52 is provided with two turns of buffering and decelerating space.

Referring back to Figures 3 to 7 and coordinating with Figures 13 and 14, the rotator 53 is fixed by the other side 522 of the position-limiting and decelerating elastic member 52 . The rotator 53 includes a protruding body 531 and a locking portion 532 opposite to the protruding body 531 . Wherein the protruding body 531 has a third opening 533, and a third chamber 534 communicating with the third opening 533 is formed in the protruding body 531, and a second protruding chamber 534 is provided at the end of the third chamber 534. Block 5341, the second convex block 5341 is correspondingly locked with the first convex block 5171; when the rotator 53 is screwed to the fixed shaft 55 and is driven by the limiting swivel 54 and rotated and displaced, the protruding body 531 penetrates through the second penetrating space 524, so that the third chamber 534 of the protruding body 531 is inserted into the third rod body 517 until the second protrusion 5341 and the third rod body 517 The first protrusion 5171 forms a corresponding lock, which is used for buffering and deceleration when the roller blind 2 is rolled up to the highest point of the lower rail 23, which is the so-called stop point D of the upper limit. On the outer periphery of the protruding body 531 , there is a protruding block 5311 that forms a distance 5312 from the engaging portion 532 and limits the position-limiting and decelerating elastic member 52 . The locking part 532 includes a second shaft hole 535 and an inner space 536 separated by a ring protrusion 5321 communicating with the third chamber 534 and the third opening 533, connecting the ring protrusion 5321 and the locking part A first resisting portion 537 between 532 , and at least one insertion hole 5361 formed in the inner space 536 of the engaging portion 532 . Wherein the second shaft hole 535 has a first threaded portion 538 . There are four jacks 5361 in this embodiment. The insertion hole 5361 is used for inserting and positioning the other side 522 of the limiting and decelerating elastic member 52 (as shown in FIG. 12 ), so that a circle adjacent to the other side 522 of the limiting and decelerating elastic member 52 is inserted into the space 5312 The other side 522 of the position-limiting and decelerating elastic member 52 is resisted and restricted from falling off by the protruding block 5311 .

Referring back to Figures 3 to 6 and coordinating with Figures 10 to 12, the limit swivel 54 is movably screwed to the fixed shaft 55 and combined with the upper rail 20, and the limit swivel 54 Driven by the upper rail 20 , it rotates and moves along the fixed shaft 55 . Wherein the limiting swivel 54 is provided with a third shaft hole 541 having a second threaded portion 542, and at least one limiting groove 543, the limiting groove 543 corresponds to the limiting protrusion 21 of the upper rail 20, so that The upper rail 20 can drive the limiting swivel 54 to cooperate with the limiting protrusion 21 of the upper rail 20 to rotate and move along the fixed shaft 55 . Both sides of the limiting swivel 54 have a second abutment adjacent to the limiting groove 543 and opposite to each other. The blocking portion 544 and a third blocking portion 545 , wherein the second blocking portion 544 of the limit rotation body 54 correspondingly engages with the first blocking portion 537 of the rotator 53 and drives the rotator 53 to rotate and displace.

Referring again to FIG. 3 to FIG. 8 and FIG. 9 , the fixed shaft member 55 is used for the rotational movement of the limiting swivel 54 and the rotator 53 and is fixed inside the limiting reduction sleeve 51 . The fixed shaft member 55 includes a shaft 551, a protruding ring 552 connected to one side of the shaft 551, a third threaded portion 553 connected to the protruding ring 552 and protruding in the opposite direction relative to the shaft 551. And a second fixing part 554 connected to the third threaded part 553 and protruding in the opposite direction relative to the convex ring body 552, the shaft 551 has a fourth shaft hole 5511 and a hole through the fourth shaft hole 5511 The fixing hole 5513, the fourth shaft hole 5511 is a hexagonal hole, for the second protruding shaft 42 of the retracting control device 4 to be embedded, and a fixing piece 5512 is inserted into the fixing hole 5513 on the outer periphery of the shaft rod 551 and The second protruding shaft 42 is fixed. A fourth resisting portion 555 is disposed on one side of the protruding ring 552 in the direction of the third threaded portion 553 , and the fourth resisting portion 555 is correspondingly engaged with the third resisting portion 545 of the limiting swivel 54 . The third threaded portion 553 is engaged with the second threaded portion 542 of the limiting swivel 54 and the first threaded portion 538 of the rotator 53 , the third threaded portion 553 is provided for the limiting swivel 54 and the rotator 53 rotation moves. The outer surface of the second fixing portion 554 has a groove 5541 , and the groove 5541 and the first fixing portion 5163 are convexly engaged and fixed. In one embodiment, the first resisting portion 537 , the second resisting portion 544 , the third resisting portion 545 and the fourth resisting portion 555 are protrusions.

Referring back to Fig. 3 and Fig. 4, these fixing brackets 6 are arranged and fixed on both sides above the window. The fixing brackets 6 respectively include a fixing body 61 mounted on one of the two sides above the window and a stand body 62 connected below the fixing bodies 61 . Wherein, each of the stand bodies 62 is respectively provided with a through hole 621 for the fixing column 31 of the roller blind device 3 and the first protruding shaft 41 of the retraction control device 4 to penetrate and position.

Please refer to Figure 3 and Figure 7 to Figure 12, when the user wants to unfold the curtain 7 of the roller blind 2, the upper rail 20 rotates and lowers the lower rail 23 to the stop point B of the lower limit , the upper rail 20 can drive the roller blind device 3, the retraction control device 4, and the limit slot 543 of the limit swivel 54 along the limit protrusion 21 rotation, the third resisting portion 545 of the limiting swivel 54 engages with the fourth resisting portion 555 of the fixed shaft member 55 to stop (as shown in Figures 8 and 9); on the contrary, the present invention passes through the The third threaded portion 553 of the fixed shaft member 55 is used for the second threaded portion of the limiting swivel 54 when the roller blind 2 is rolled up to the upper limit C of the lower rail 23 (as shown in FIG. 7 ). 542 engages the third threaded portion 553 of the fixed shaft 55 to rotate and move from the direction of the rotator 53, and when the limiting rotator 54 pushes against the rotator 53, the second resisting rotator 54 of the limiting rotator 54 Part 544 engages with the first resisting portion 537 of the rotator 53 to stop and drives the rotator 53 to rotate and displace (as shown in Figures 10 to 12), so that the rotator 53 is then driven to be connected and fixed to the rotator 53 In the torsion state of the limit deceleration elastic member 52, the protruding body 531 of the rotator 53 is driven to rotate and move from the second through space 524 and compress the limit deceleration elastic member 52, then when the limit deceleration elastic member 52 is compressed by the rotator 53 when it rotates and moves, and it also has the buffering and decelerating force to assist the roller blind 2 when it is retracted, and makes the limiting deceleration elastic member 52 have a larger torsional elastic force. When the member 52 is twisted in the buffer deceleration space of the first circle, the second protrusion 5341 of the rotator 53 will not engage with the first protrusion 5171 of the limit deceleration sleeve 51, until the limit deceleration elastic When the member 52 is twisted in the buffer deceleration space of the second turn, the protruding body 531 of the rotator 53 continues to rotate and move from the direction of the third rod body 517, so that the third chamber 534 of the protruding body 531 Insert the third rod body 517 until the second protrusion 5341 of the rotator 53 engages with the first protrusion 5171 of the limit reduction sleeve 51 to stop (as shown in Figures 13 and 14), When the roller blind 2 is rolled up to the highest point of the lower rail 23, that is, the so-called stop point D of the upper limit, a buffer deceleration effect (as shown in Figure 7) is generated instantaneously to reduce the impact force and noise, and avoid the deceleration limit Parts inside device 5 are damaged.

However, the foregoing is only a preferred embodiment of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and is not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications based on the shape, structure and features described in the application scope of the present invention shall be included in the patent application scope of the present invention.

5: Deceleration limit device

51: Limit reduction sleeve

511: Convex cover wall

512: first opening

513: Convex rod

5162: The first shaft hole

5163: the first fixed part

518: The first chamber

52: limit deceleration elastic part

521: one side

522: the other side

523: The first wearing space

53:Rotator

531:Protrusion

5311: Convex block

5312: Spacing

532: locking part

533: The third opening

534: The third chamber

535: Second shaft hole

5361: jack

537: The first resistance department

538: The first threaded part

54: limit swivel

541: The third shaft hole

542: Second threaded part

543: limit slot

544: The second resistance department

545: The third resistance department

55: Fixed shaft

551: shaft

5512:Fixer

5513: Fixing hole

552: convex ring body

553: The third threaded part

554: The second fixed part

5541: Groove

555: The Fourth Resistance Department

Claims (8)

A deceleration and limiting device for roller blinds, the deceleration and limiting device includes a limiting deceleration sleeve, a limiting deceleration elastic member, a rotator, a limiting swivel, and a fixed shaft; wherein the limiting deceleration sleeve It includes a convex cover with a first opening and a protruding rod with a second opening protruding from one side of the convex cover, a side connecting the first opening is formed in the convex cover and the protruding rod A first chamber, a first shaft hole with a first fixing portion is formed in the protruding rod, a second chamber communicating with the second opening, the first shaft hole and the first opening is formed in the protruding rod , and protrude a first bump at the end of the protruding rod; one side of the limit deceleration elastic member is sleeved on one side of the limit deceleration sleeve, and the other side is fixed on one side of the rotator, and on the The limit deceleration sleeve is stretchable between the rotator; the rotator is fixed on the other side of the limit deceleration elastic member, and the rotator includes a protruding body and a locking part opposite to the protruding body , wherein the protruding body has a third opening, and a third chamber communicating with the third opening is formed in the protruding body, and a second protrusion is provided at the end of the third chamber, and the second protrusion The block is correspondingly locked with the first convex block, and the locking part includes a second shaft hole and an inner space separated by a ring convex body to communicate with the third chamber and the third opening, connecting the ring convex body and the third opening. A first resisting portion between the locking parts, and at least one insertion hole formed in the internal space of the locking part for the other side of the limiting deceleration elastic member to be inserted and positioned, the second shaft hole has a first A threaded portion; the limiting swivel is movably screwed to the fixed shaft, the limiting swivel is provided with a third shaft hole having a second threaded portion, and at least one limiting slot, the limiting swivel There are a second resisting portion and a third resisting portion that are adjacent to the limiting groove and opposite to each other on both sides, wherein the second resisting portion of the limiting swivel corresponds to engage with the first resisting portion of the rotator; The fixed shaft is used for the limit swivel and the rotator to rotate and be fixed inside the limit reduction sleeve. The fixed shaft includes a shaft, a convex ring connected to one side of the shaft, and a convex ring connected to the A third threaded part protruding from the ring body in the opposite direction relative to the shaft rod and a second fixing part connected with the third threaded part and protruding in the opposite direction relative to the protruding ring body, wherein the protruding ring body is from A fourth resisting portion is provided on one side of the direction of the third threaded portion, and the fourth resisting portion is correspondingly engaged with the third resisting portion of the limiting swivel, and the third threaded portion engages with the limiting swivel The second threaded part and the first threaded part of the rotator, the second fixing part is engaged with the first fixing part correspondingly; through the fixing shaft, when a roller blind rolls up to the upper limit position, the limiting The rotary body rotates until it is locked with the rotator and drives the rotator to rotate and displace, so that the rotator then drives the limit deceleration elastic member connected and fixed with the rotator to twist the state, so that the roller blind can be retracted as fast as possible. When the upper limit is reached, the buffer deceleration effect is generated instantaneously. The deceleration limiting device for roller blinds as claimed in claim 1, wherein the protruding rod has a first rod connected to one side of the protruding cover with an outer diameter smaller than that of the protruding cover, and the first rod connected to the a second rod on one side and having an external thread for screwing the limiting deceleration elastic member, and a third rod connected to one side of the second rod and having an outer diameter smaller than the outer diameter of the second rod, The outer peripheral edge of the second rod body tapers from one side to the other side to form a cone shape, and the outer diameter is larger than the outer diameter of the first rod body. The deceleration limiting device for roller blinds as described in claim 2, wherein, one side and the other side of the limiting deceleration elastic member form a first passing space and a second passing space, and the first passing space A space is provided for the second rod body to pass through, and the second passing space is provided for one side of the rotator to pass through. The deceleration and limiting device for roller blinds as claimed in claim 3, wherein, the outer periphery of the protrusion of the rotator is provided with a protruding block that forms a distance from the engaging portion and limits the deceleration elastic member. The deceleration and limiting device for a roller blind as claimed in claim 4, wherein the limiting and decelerating elastic member is a spring. The deceleration limiting device for a roller blind according to Claim 1, wherein the first resisting portion, the second resisting portion, the third resisting portion and the fourth resisting portion are protrusions. The deceleration limiting device for a roller blind according to claim 1, wherein the first fixing part is a convex body; wherein, the outer surface of the second fixing part has a groove correspondingly engaged and fixed with the first fixing part. The deceleration limiting device for roller blinds as described in Claim 1, wherein the shaft rod has a fourth shaft hole and a fixing hole passing through the fourth shaft hole, the fourth shaft hole is a hexagonal hole, and The outer peripheral edge of the shaft rod is fixed by passing through the fixing hole with a fixing piece.

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