An escape device that can be hidden under a window

Abstract

This invention discloses an escape device that can be hidden under a window, including an escape basket, a receiving cavity, and a window. The escape basket includes a folded form for storage within the receiving cavity and an unfolded form for escape. The escape basket includes a first frame, a second frame, a folding vertical bar, and a horizontal bar. It also includes a suspension line for suspending the escape basket, a storage mechanism for storing the suspension line within the first frame, a line-releasing mechanism within the first frame, and a balancing support mechanism on the suspension line for smooth descent of the escape basket. The balancing support mechanism includes a lifting component that can pull the horizontal bar upward. In this way, the window appears aesthetically pleasing under normal conditions; when the escape basket is extended, the folding vertical bar unfolds, and the lifting component pulls the horizontal bar upward, thus providing comprehensive protection for personnel entering the escape basket. The suspension line is only located on one side of the first frame, simplifying the structure, and the balancing support component ensures smooth descent of the escape basket.

Description

Technical Field

[0001] This invention relates to the technical field of escape devices, and more particularly to an escape device that can be hidden under a window. Background Technology

[0002] In modern buildings, especially high-rise buildings, the safe evacuation and escape of personnel are crucial issues in emergencies such as fires. Existing escape equipment has some shortcomings. For example, some escape devices are bulky, affecting the aesthetics of the building after installation; others lack stability and safety during use, failing to ensure the safety of personnel during escape. For instance, patent application CN222218448U discloses a glass railing-concealed escape device. While this escape basket can be hidden under a window, its descent mechanism is relatively complex, typically requiring the connection of suspension lines to both the front and rear frames of the basket to achieve the descent function. Summary of the Invention

[0003] Therefore, the purpose of this invention is to provide an escape device with a simple structure that can be hidden under a window without affecting the aesthetic appearance of the building.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows:

[0005] An escape device that can be hidden under a window includes an escape basket, a receiving cavity mounted on a wall for storing the escape basket, and a window mounted on the wall for sealing the receiving cavity. The escape basket has a folded form for storage in the receiving cavity and an unfolded form for escape. The escape basket includes a first frame on the front side, a second frame on the rear side, several folding vertical bars connected to the first and second frames, and several horizontal bars that can move up and down in the first and second frames. The receiving cavity has a suspension line for suspending the escape basket. The first frame has a storage mechanism for storing the suspension line and a line-releasing mechanism on the first frame for releasing the suspension line to lower the escape basket. The suspension line has a balancing support mechanism for smoothly lowering the escape basket, and the balancing support mechanism includes a lifting component that can pull the horizontal bars upward.

[0006] In a preferred embodiment of the present invention, the balancing support mechanism includes a support member disposed above the first frame, a first traction line disposed on the support member with one end disposed on the first frame, a second traction line disposed on the support member with one end disposed on the second frame, and an eighth traction line disposed on the support member with one end disposed on the folding longitudinal bar, wherein the suspension line is wound around the support member at least once.

[0007] In a preferred embodiment of the present invention, the first frame is provided with a first guide groove for the crossbar to move up and down, and the second frame is provided with a second guide groove for the crossbar to move up and down. The crossbar includes a first crossbar disposed on the first frame and a second crossbar disposed on the second frame. The left and right ends of the first crossbar are provided with first plugs that can be inserted into the first guide groove, and the left and right ends of the second crossbar are provided with second plugs that can be inserted into the second guide groove.

[0008] In a preferred embodiment of the present invention, the first frame is provided with a first through hole communicating with the first guide groove, and the second frame is provided with a second through hole communicating with the second guide groove. The lifting assembly includes a third traction line connected to the first traction line and extending into the first guide groove through the first through hole, and a fourth traction line connected to the second traction line and extending into the second guide groove through the second through hole. The first plugs at both ends of the first crossbar are fixed to the third traction line, and there is a certain distance between two adjacent first crossbars. The second plugs at both ends of the second crossbar are fixed to the fourth traction line, and there is a certain distance between two adjacent second crossbars.

[0009] In a preferred embodiment of the present invention, the folding rod includes a first folding rod disposed on the first frame, a second folding rod disposed on the second frame and hinged to the first folding rod, and a hinge shaft that hinges the first folding rod and the second folding rod together, and the eighth traction line is connected to the hinge shaft of the uppermost folding rod.

[0010] In a preferred embodiment of the present invention, a fifth traction line is provided on the hinge shaft between the adjacent connecting folding rods to connect the two; a sixth traction line connected to the hinge shaft is provided on the first frame above the first folding rod; and a seventh traction line connected to the hinge shaft is provided on the second frame above the second folding rod.

[0011] In a preferred embodiment of the present invention, a first limiting plate is provided on the first frame and below the first folding rod to limit the downward swing position of the first folding rod, and a second limiting plate is provided on the second frame and below the second folding rod to limit the downward swing position of the second folding rod.

[0012] In a preferred embodiment of the present invention, the bottom of the first frame is provided with a first storage slot, the bottom of the second frame is provided with a second storage slot, and the bottom of the escape basket is provided with a rollable support net assembly. The support net assembly includes a first support column disposed in the first storage slot, a second support column disposed in the second storage slot, and a support net disposed between the first support column and the second support column and capable of being rolled up on the first support column and the second support column.

[0013] In a preferred embodiment of the present invention, the suspension line includes a first suspension line disposed on the left side of the first frame and a second suspension line disposed on the left side of the second frame. The storage mechanism includes a first storage cavity disposed on the left side of the first frame, a first winding shaft disposed in the first storage cavity, a second storage cavity disposed on the right side of the first frame, a second winding shaft disposed in the second storage cavity, and a coupling disposed between the first winding shaft and the second winding shaft and drivingly connecting the two. The first frame is provided with a first wire hole communicating with the first storage cavity, and the first frame is provided with a second wire hole communicating with the second storage cavity. The first winding shaft is provided with a first threaded groove for winding the first suspension line, and the second winding shaft is provided with a second threaded groove for winding the second suspension line. The rotation direction of the first threaded groove is opposite to the rotation direction of the second threaded groove.

[0014] In a preferred embodiment of the present invention, the wire feeding mechanism includes a housing disposed on the first frame and located at the coupling, a manual wire feeding structure disposed on the housing for synchronously feeding the first suspension wire and the second suspension wire, and a damper for limiting the feeding speed of the first suspension wire and the second suspension wire. The manual wire feeding structure includes a first limiting block disposed on the coupling, a threaded shaft disposed in the housing, a rotating handle disposed on the housing and driving the threaded shaft to rotate, and a second limiting block disposed on the threaded shaft and capable of reciprocating along the axial direction of the threaded shaft to engage with the first limiting block.

[0015] The beneficial effects of this invention are as follows: The escape device includes an escape basket, a receiving cavity for storing the escape basket, and a window for sealing the receiving cavity. The escape basket includes a folded form for storage within the receiving cavity and an unfolded form for escape. The escape basket includes a first frame, a second frame, a folding vertical bar, and a horizontal bar. A suspension line for suspending the escape basket is provided within the receiving cavity, and a storage mechanism for storing the suspension line is provided within the first frame. A line-releasing mechanism is provided on the first frame for releasing the suspension line to lower the escape basket. A balancing support mechanism is provided on the suspension line to ensure a smooth descent of the escape basket. The balancing support mechanism includes a lifting component that can pull the horizontal bar upwards. Thus, under normal conditions, the escape basket is in a folded form and stored within the receiving cavity, and the window is surrounded by a protective frame to conceal the receiving cavity, making the escape basket hidden within the receiving cavity invisible from the outside. This results in a simpler and more aesthetically pleasing overall appearance of the window, without affecting the building's exterior. When an escape basket is needed for evacuation during a fire, the folding vertical bar unfolds after the basket is deployed, and the lifting component pulls the horizontal bar upwards to the appropriate position, transforming the escape basket from a folded to an unfolded state. This provides comprehensive protection for those entering the basket. The suspension line is only located on one side of the first frame, simplifying the structure. Furthermore, the included balance support component prevents the escape basket from tipping over during descent due to concentrated force on one side of the first frame, ensuring its safety and allowing for a smooth descent. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the escape basket of the present invention in its unfolded state for escape.

[0017] Figure 2 This is a schematic diagram of the escape basket of the present invention being folded and stored in the receiving cavity;

[0018] Figure 3 This is a schematic diagram of the escape basket in this invention;

[0019] Figure 4 This is a cross-sectional view of the escape basket in this invention;

[0020] Figure 5 This is a schematic diagram of the support mesh component in this invention;

[0021] Figure 6 This is a partial schematic diagram of the balancing support mechanism in this invention;

[0022] Figure 7 This is a schematic diagram of the support member in this invention;

[0023] Figure 8 This is a cross-sectional view of the present invention located inside the upper part of the first frame;

[0024] Figure 9 This is a partial schematic diagram of the storage mechanism in this invention;

[0025] Figure 10 This is a cross-sectional view of the present invention located at the wire feeding mechanism. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0027] Reference Figures 1 to 10 An escape device that can be hidden under a window includes an escape basket 1, a receiving cavity 2 mounted on a wall for storing the escape basket 1, and a window 3 mounted on a wall for sealing the receiving cavity 2. The escape basket 1 includes a folded form for storage in the receiving cavity 2 and an unfolded form for escape. The escape basket 1 includes a first frame 11 on the front side, a second frame 12 on the rear side, and several folding vertical bars 1 connected to the first frame 11 and the second frame 12. 3. The window 3 includes several horizontal bars 14 that are movable up and down and are located within the first frame 11 and the second frame 12. The receiving cavity 2 contains a suspension line 4 for suspending the escape basket 1. The first frame 11 contains a storage mechanism 5 for storing the suspension line 4. The first frame 11 also has a line-releasing mechanism 6 for releasing the suspension line 4 to lower the escape basket 1. The suspension line 4 has a balancing support mechanism 7 for smoothly lowering the escape basket 1. The balancing support mechanism 7 includes a lifting component 71 that can pull the horizontal bars 14 upwards. In this way, the escape basket 1 is folded and stored in the receiving cavity 2 under normal conditions. Furthermore, the window 3 is surrounded by a protective frame to conceal the receiving cavity 2, making the escape basket 1 hidden inside the receiving cavity 2 invisible from the outside. This results in a simpler and more aesthetically pleasing overall appearance of the window 3, without affecting the building's exterior. When an escape basket 1 is needed to escape during a fire, the window 3 can be opened and the escape basket 1, stored in the receiving cavity 2, can be pushed out. After the escape basket 1 is pushed out, the folding vertical bar 13 will unfold, and the lifting component 71 will pull the horizontal bar 14 upward to the corresponding position, so that the escape basket 1 changes from a folded state to an unfolded state. Then, the hanging line 4 will be released through the line-releasing mechanism 6, so that the escape basket 1 will descend, thereby allowing for a quick escape from a floor or ground that has not yet caught fire. At the same time, the hanging line is only set on one side of the first frame 11, making the structure simpler. And through the provided balance support component, the escape basket 1 will not be able to overturn due to the force being concentrated on only one side of the first frame 11 during the descent, thus ensuring the safety performance of the escape basket 1 during the descent and allowing it to descend smoothly.

[0028] Reference Figure 6 and Figure 7In this solution, the balancing support mechanism 7 includes a support member 72 disposed above the first frame 11, a first traction line 73 disposed on the support member 72 with one end disposed on the first frame 11, a second traction line 74 disposed on the support member 72 with one end disposed on the second frame 12, and an eighth traction line 75 disposed on the support member 72 with one end disposed on the folding vertical rod 13. The suspension line 4 is wound around the support member 72 at least once. Specifically, the support member 72 includes a support block 721 and a pulley 722 disposed on the upper end of the support block 721. The first traction line 73, the second traction line 74, and the eighth traction line 75 are all disposed on the lower end of the support block 721, and the suspension line 4 is wound around the pulley 722 at least once. In this way, the force received by the escape basket 1 in the horizontal direction is balanced by the first traction line 73 and the second traction line 74, preventing the escape basket 1 from overturning. At the same time, the height position of the support member 72 is limited by the eighth traction line 75, so that the first traction line 73 and the second traction line 74 are both in a straight state, avoiding uneven force on one side. It also facilitates the release of the hanging line 4 without causing jamming.

[0029] Reference Figure 3 and Figure 4 In this design, the first frame 11 is provided with a first guide groove 111 for the horizontal bar 14 to move up and down, and the second frame 12 is provided with a second guide groove 121 for the horizontal bar 14 to move up and down. The horizontal bar 14 includes a first horizontal bar 141 disposed on the first frame 11 and a second horizontal bar 142 disposed on the second frame 12. The left and right ends of the first horizontal bar 141 are provided with first plugs 1411 that can be inserted into the first guide groove 111, and the left and right ends of the second horizontal bar 142 are provided with second plugs 1421 that can be inserted into the second guide groove 121. The first plugs 1411 and the second plugs 1421 are T-shaped and are respectively engaged in the first guide groove 111 and the second guide groove 121 for up and down movement.

[0030] Reference Figure 4In this solution, the first frame 11 is provided with a first through hole 112 communicating with the first guide groove 111, and the second frame 12 is provided with a second through hole 122 communicating with the second guide groove 121. The lifting assembly 71 includes a third traction line 711 connected to the first traction line 73 and extending into the first guide groove 111 through the first through hole 112, and a fourth traction line 712 connected to the second traction line 74 and extending into the second guide groove 121 through the second through hole 122. The first plugs 1411 at both ends of the first crossbar 141 are fixed to the third traction line 711. The third traction line 711 and the fourth traction line 712 are respectively fixed to the bottom of the first frame 11 and the second frame 12, and there is a certain distance between two adjacent first crossbars 141. The second plugs 1421 at both ends of the second crossbar 142 are fixed to the fourth traction line 712, and there is a certain distance between two adjacent second crossbars 142. After the escape basket 1 is pushed out, the support member 72 will be pulled upward to the corresponding position. Depending on the length of the eighth traction line 75, the first traction line 73 and the second traction line 74 will be pulled upward, and then the third traction line 711 and the fourth traction line 712 will be pulled upward, thereby pulling the crossbar 14 upward to the corresponding position.

[0031] Reference Figure 3 In this design, the folding rod 13 includes a first folding rod 131 mounted on the first frame 11, a second folding rod 132 mounted on the second frame 12 and hinged to the first folding rod 131, and a hinge shaft 133 that hinges the first folding rod 131 and the second folding rod 132. The third traction line 711 is connected to the hinge shaft 133 of the uppermost folding rod 13. Furthermore, each hinge shaft 133 between adjacent folding rods 13 is provided with a fifth traction line 134 connecting the two. A sixth traction line 135 connected to the hinge shaft 133 is provided on the first frame 11 above the first folding rod 131, and a seventh traction line 136 connected to the hinge shaft 133 is provided on the second frame 12 above the second folding rod 132, thereby enabling each folding rod 13 to fold upwards or unfold downwards synchronously.

[0032] Reference Figure 3 In this solution, a first limiting plate 137 is provided on the first frame 11 and below the first folding vertical bar 131 to limit the downward swing position of the first folding vertical bar 131, and a second limiting plate 138 is provided on the second frame 12 and below the second folding vertical bar 132 to limit the downward swing position of the second folding vertical bar 132, so that the first folding vertical bar 131 and the second folding vertical bar 132 are in a horizontal state after being unfolded, which better supports the escape basket 1.

[0033] Reference Figure 4 and Figure 5 In this design, the bottom of the first frame 11 is provided with a first storage slot 113, the bottom of the second frame 12 is provided with a second storage slot 123, and the bottom of the escape basket 1 is provided with a rollable support net assembly 15. The support net assembly 15 includes a first support column 151 disposed in the first storage slot 113, a second support column 152 disposed in the second storage slot 123, and a support net 153 disposed between the first support column 151 and the second support column 152 and capable of being rolled up on the first support column 151 and the second support column 152. Thus, during the unfolding of the escape basket 1, the support net 153 at the bottom is also pulled open, thereby supporting the personnel entering the escape basket 1.

[0034] Reference Figure 8 and Figure 9 In this design, the suspension line 4 includes a first suspension line 41 disposed on the left side of the first frame 11 and a second suspension line 42 disposed on the left side of the second frame 12. The storage mechanism 5 includes a first storage cavity 51 disposed on the left side of the first frame 11, a first winding shaft 52 disposed in the first storage cavity 51, a second storage cavity 53 disposed on the right side of the first frame 11, a second winding shaft 54 ​​disposed in the second storage cavity 53, and a mechanism between the first winding shaft 52 and the second winding shaft 54. The coupling 55 connects the two components. The first frame 11 has a first wire hole 114 communicating with the first storage cavity 51, and the first frame 11 has a second wire hole 115 communicating with the second storage cavity 53. The first winding shaft 52 has a first threaded groove 521 for winding the first suspension wire 41, and the second winding shaft 54 ​​has a second threaded groove 541 for winding the second suspension wire 42. The rotation direction of the first threaded groove 521 is opposite to that of the second threaded groove 541. This arrangement organizes and stores the first and second suspension wires 41 and 42, allowing for smooth unwinding without jamming.

[0035] Reference Figure 8 and Figure 10In this solution, the wire feeding mechanism 6 includes a housing 61 disposed on the first frame 11 and located at the coupling 55, a manual wire feeding structure 62 disposed on the housing 61 for synchronously feeding the first suspension wire 41 and the second suspension wire 42, and a damper 63 for limiting the feeding speed of the first suspension wire 41 and the second suspension wire 42. The manual wire feeding structure 62 includes a first limiting block 621 disposed on the coupling 55, a threaded shaft 622 disposed in the housing 61, a rotating handle 623 disposed on the housing 61 and driving the threaded shaft 622 to rotate, and a second limiting block 624 disposed on the threaded shaft 622 and capable of reciprocating along the axial direction of the threaded shaft 622 to engage with the first limiting block 621. Further, the first limiting block 621 is teardrop-shaped, and the second limiting block 624 includes a recessed portion that abuts against the protruding portion of the first limiting block 621. This manual control of the first and second suspension lines 41 and 42 ensures a smooth descent of the escape basket 1, making the operation simple and convenient, avoiding the use of electrical control components, and thus enhancing safety and reliability. Furthermore, the inclusion of a damper 63 prevents the escape basket 1 from descending too quickly, further improving safety performance.

[0036] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An escape device that can be hidden under a window, comprising an escape basket (1), a receiving cavity (2) disposed on a wall and capable of storing the escape basket (1), and a window (3) disposed on a wall and capable of sealing the receiving cavity (2), wherein the escape basket (1) includes a folded form for storage within the receiving cavity (2) and an unfolded form for escape, characterized in that, The escape basket (1) includes a first frame (11) on the front side, a second frame (12) on the rear side, several folding vertical bars (13) connected to the first frame (11) and the second frame (12), and several horizontal bars (14) that are located in the first frame (11) and the second frame (12) and can move up and down. The receiving cavity (2) is provided with a suspension line (4) for suspending the escape basket (1). The first frame (11) is provided with a storage mechanism (5) for storing the suspension line (4). The first frame (11) is provided with a line-releasing mechanism (6) for releasing the suspension line (4) to lower the escape basket (1). The suspension line (4) is provided with a balance support mechanism (7) for smoothly lowering the escape basket (1). The balance support mechanism (7) includes a lifting component (71) that can pull the horizontal bar (14) upward. The balance support mechanism (7) includes a support member (72) disposed above the first frame (11), a first traction line (73) disposed on the support member (72) and with the other end disposed on the first frame (11), a second traction line (74) disposed on the support member (72) and with the other end disposed on the second frame (12), and an eighth traction line (75) disposed on the support member (72) and with the other end disposed on the folding vertical bar (13). The suspension line (4) is wound around the support member (72) at least once. The suspension line (4) includes a first suspension line (41) disposed on the left side of the first frame (11) and a second suspension line (42) disposed on the left side of the second frame (12). The storage mechanism (5) includes a first storage cavity (51) disposed on the left side of the first frame (11), a first winding shaft (52) disposed in the first storage cavity (51), a second storage cavity (53) disposed on the right side of the first frame (11), a second winding shaft (54) disposed in the second storage cavity (53), and a shaft disposed between the first winding shaft (52) and the second winding shaft (54) and holding... The coupling (55) that connects the two parts in transmission, the first frame (11) is provided with a first wire hole (114) communicating with the first storage cavity (51), the first frame (11) is provided with a second wire hole (115) communicating with the second storage cavity (53), the first winding shaft (52) is provided with a first threaded groove (521) for winding the first suspension wire (41), and the second winding shaft (54) is provided with a second threaded groove (541) for winding the second suspension wire (42). The rotation direction of the first threaded groove (521) is opposite to the rotation direction of the second threaded groove (541).

2. The escape device that can be hidden under a window according to claim 1, characterized in that, The first frame (11) is provided with a first guide groove (111) for the crossbar (14) to move up and down, and the second frame (12) is provided with a second guide groove (121) for the crossbar (14) to move up and down. The crossbar (14) includes a first crossbar (141) disposed on the first frame (11) and a second crossbar (142) disposed on the second frame (12). The left and right ends of the first crossbar (141) are provided with a first plug (1411) that can be inserted into the first guide groove (111), and the left and right ends of the second crossbar (142) are provided with a second plug (1421) that can be inserted into the second guide groove (121).

3. The escape device that can be hidden under a window according to claim 2, characterized in that, The first frame (11) is provided with a first through hole (112) communicating with the first guide groove (111), and the second frame (12) is provided with a second through hole (122) communicating with the second guide groove (121). The lifting assembly (71) includes a third traction line (711) connected to the first traction line (73) and extending into the first guide groove (111) through the first through hole (112), and a third traction line (711) connected to the second traction line (74) and extending into the first guide groove (111) through the first through hole (112). The second through hole (122) extends into the fourth traction line (712) in the second guide groove (121). The first plugs (1411) at both ends of the first crossbar (141) are fixed on the third traction line (711), and there is a certain distance between two adjacent first crossbars (141). The second plugs (1421) at both ends of the second crossbar (142) are fixed on the fourth traction line (712), and there is a certain distance between two adjacent second crossbars (142).

4. The escape device that can be hidden under a window according to claim 1, characterized in that, The folding rod (13) includes a first folding rod (131) disposed on the first frame (11), a second folding rod (132) disposed on the second frame (12) and hinged to the first folding rod (131), and a hinge shaft (133) that hinges the first folding rod (131) and the second folding rod (132). The eighth traction line (75) is connected to the hinge shaft (133) of the uppermost folding rod (13).

5. An escape device that can be hidden under a window according to claim 4, characterized in that, A fifth traction line (134) connecting the two is provided on the hinge shaft (133) between adjacent connecting folding vertical bars (13). A sixth traction line (135) connected to the hinge shaft (133) is provided on the first frame (11) above the first folding vertical bar (131). A seventh traction line (136) connected to the hinge shaft (133) is provided on the second frame (12) above the second folding vertical bar (132).

6. An escape device that can be hidden under a window according to claim 5, characterized in that, A first limiting plate (137) is provided on the first frame (11) and below the first folding vertical bar (131) to limit the downward swing position of the first folding vertical bar (131). A second limiting plate (138) is provided on the second frame (12) and below the second folding vertical bar (132) to limit the downward swing position of the second folding vertical bar (132).

7. An escape device that can be hidden under a window according to claim 6, characterized in that, The bottom of the first frame (11) is provided with a first storage slot (113), the bottom of the second frame (12) is provided with a second storage slot (123), and the bottom of the escape basket (1) is provided with a rollable support net assembly (15). The support net assembly (15) includes a first support column (151) disposed in the first storage slot (113), a second support column (152) disposed in the second storage slot (123), and a support net (153) disposed between the first support column (151) and the second support column (152) and which can be rolled up on the first support column (151) and the second support column (152).

8. An escape device that can be hidden under a window according to claim 1, characterized in that, The wire feeding mechanism (6) includes a housing (61) disposed on the first frame (11) and located at the coupling (55), a manual wire feeding structure (62) disposed on the housing (61) for synchronously feeding the first suspension wire (41) and the second suspension wire (42), and a damper (63) for limiting the feeding speed of the first suspension wire (41) and the second suspension wire (42). The manual wire feeding structure (62) includes a first limiting block (621) disposed on the coupling (55), a threaded shaft (622) disposed in the housing (61), a rotating handle (623) disposed on the housing (61) and driving the threaded shaft (622) to rotate, and a second limiting block (624) disposed on the threaded shaft (622) and reciprocating along the axial direction of the threaded shaft (622) to engage with the first limiting block (621).

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