Portable gait booster

Abstract

The utility model discloses a portable gait booster which is applied to the field of walking boosters and comprises a stand column, a sliding cavity is formed in the stand column, holding frames are arranged in the sliding cavity, a locking mechanism is arranged between the holding frames and the sliding cavity, a connecting cross rod is arranged between the two holding frames, and the connecting cross rod is connected with the stand column. During use, firstly, the sliding cavities are formed in the stand columns, then the holding frames slide up and down in the sliding cavities, the holding frames are adjusted to the proper height, then the locking mechanisms are tightened, the holding frames are fixed in the sliding cavities, and then the two holding frames are connected through the connecting cross rod. When the device is not used, the rotating mechanism is loosened, the holding frame rotates in the rotating mechanism, then the holding frame is in contact with the connecting cross rod, and the occupied area of the device is reduced. A user can move through the holding frame at the moment, a supporting effect is provided for the user through the holding frame, and when the device does not need to be used, the rotating mechanism is loosened, so that the holding frame rotates in the rotating mechanism, and the holding frame is in contact with the connecting cross rod.

Description

Technical Field

[0001] The utility model belongs to the technical field of walking boosters, and particularly relates to a light and portable gait booster. Background Art

[0002] A walking aid is a walking support tool for the elderly with limited mobility, certain traumatic patients, hemiplegic patients and disabled people to help them walk or exercise their limbs. People can walk slowly and easily with the help of it, which helps patients recover and train.

[0003] The Chinese utility model patent currently announced as CN220193488U discloses a walking aid for nursing use, which is provided with a gripping tube, mounting frames are fixed on both sides of the gripping tube, and a reinforcement frame is installed on the outside of the mounting frame; the device is provided with a reinforcement device, and the placement feet are rubber sleeves, which are placed on the ground more stably, and the training position can be adjusted by moving the gripping tube and the mounting frame, and continuous walking assistance can be provided, and the connection between the connecting bracket and the mounting frame is stable, and the connection part between the connecting bracket and the mounting frame will not be deformed or damaged, thereby extending the service life of the equipment; by setting a limit device, the shielding block is moved to the outside of the protective shell, and the corresponding surface of the shielding block is fitted with the outside of the handlebar glove, and the outside of the handlebar glove is shielded by the shielding block to ensure that the handlebar glove will not loosen or move when the user holds it, which is conducive to walking assistance.

[0004] This patent helps to assist walking when in use, but it cannot be folded. It takes up a large space when not in use, which is not conducive to storage. Moreover, if it needs to be moved to other places for use, it is inconvenient to carry due to its large size. Utility Model Content

[0005] The utility model aims to provide a light and portable gait booster, which solves the problem that the existing gait booster is large in size, cannot be folded and stored, and is inconvenient to carry when being transferred.

[0006] The above technical purpose of the utility model is achieved through the following technical scheme: a lightweight and portable gait assist device, comprising a column, wherein the number of the columns is four and they are symmetrically arranged, the columns are provided with sliding cavities, the sliding cavities are provided with holding frames, the number of the holding frames is two and they are symmetrically arranged, the holding frames are U-shaped, a locking mechanism is provided between the holding frames and the sliding cavities, a connecting cross bar is provided between the two holding frames, and a rotating mechanism is provided between the connecting cross bar and the holding frames.

[0007] By adopting the above technical scheme, by setting a column, a sliding cavity, a holding frame, a locking mechanism, a connecting cross bar and a rotating mechanism, when in use, the sliding cavity is first set in the column, and then the holding frame is made to slide up and down in the sliding cavity, the holding frame is adjusted to an appropriate height, and then the locking mechanism is tightened, the holding frame is fixed in the sliding cavity, and then the connecting cross bar is used to connect the two holding frames to form a whole. At this time, the user can move through the holding frame, and the holding frame provides support for the user. When the device is not needed, the rotating mechanism is released to make the holding frame rotate in the rotating mechanism, and then the holding frame is brought into contact with the connecting cross bar, thereby reducing the footprint of the device and facilitating storage and carrying.

[0008] The utility model is further configured as follows: the locking mechanism comprises a locking sleeve, an elastic groove, an extrusion sleeve and an extrusion portion, the locking sleeve is arranged at the upper end of the column, the locking sleeve is elastically arranged, the elastic groove is arranged on the locking sleeve, the elastic grooves are several in number and are arranged circumferentially, the extrusion sleeve is threadedly connected to the locking sleeve, the extrusion portion is arranged in the extrusion sleeve, and the extrusion portion is arranged in cooperation with the locking sleeve.

[0009] By adopting the above technical scheme, a locking sleeve, an elastic groove, an extrusion sleeve and an extrusion part are provided. When the holding frame moves to a suitable height in the sliding cavity, the extrusion sleeve is rotated downward. Due to the rotation of the extrusion sleeve and the locking sleeve threads, the extrusion sleeve can move on the locking sleeve. An elastic groove is opened in the locking sleeve so that the upper end of the locking sleeve has elasticity. When the extrusion sleeve moves downward, the extrusion part can squeeze the upper end of the locking sleeve, thereby making the locking sleeve contact with the holding frame and fixing the holding frame. When the extrusion sleeve contacts the bottom of the locking sleeve, the holding frame is fixed in the sliding cavity.

[0010] The utility model is further configured as follows: the rotating mechanism includes a rotating sleeve, a locking column and a fixed sleeve, the rotating sleeve is arranged on the holding frame, both ends of the connecting cross bar are arranged inside the rotating sleeve, the locking column passes through the rotating sleeve and the connecting cross bar, and the fixed sleeve is threadedly connected to the lower end of the locking column.

[0011] By adopting the above technical solution, a rotating sleeve, a locking column and a fixed sleeve are set. When in use, the connecting cross bar is first fixed on the locking column and can rotate in the rotating sleeve. The connecting cross bar is fixed in the rotating sleeve by the locking column and the fixed sleeve. When the holding frame needs to be rotated, the fixed sleeve is loosened, so that the locking column drives the connecting cross bar to rotate in the rotating sleeve, so that the holding frame contacts the connecting cross bar, thereby reducing the space occupied by the device. Then, the fixed sleeve fixes the locking column, and then the connecting cross bar is fixed on the rotating sleeve.

[0012] The utility model is further configured as follows: a clamping block is provided on the holding frame, a clamping groove is provided on the connecting cross bar, the number of the clamping grooves is two and they are symmetrically arranged, a limiting plate is provided inside the clamping groove, a spring is provided on the limiting plate, and the other end of the spring is provided on the inner wall of the clamping groove.

[0013] By adopting the above technical solution, a clamping block, a clamping groove, a limit plate and a spring are set. When the holding frame contacts the connecting cross bar, the clamping block enters into the clamping groove, and the side wall of the clamping block can squeeze the limit plate and then squeeze the spring. When the clamping block completely enters into the clamping groove, the clamping block is fixed in the clamping groove by the force of the spring to restore the deformation.

[0014] The utility model is further configured as follows: a holding handle is provided on the holding frame, and an anti-slip protrusion is provided on the holding handle.

[0015] By adopting the above technical solution, by providing a gripping handle and an anti-skid protrusion, when in use, first the gripping handle can provide a fulcrum for the user, and then the anti-skid protrusion can increase the friction between the user's palm and the gripping handle to avoid hand slippage.

[0016] The utility model is further configured as follows: a reinforcing rib is arranged between the two upright posts, the reinforcing rib is arranged in a U shape, and a latch is arranged between the reinforcing rib and the upright post.

[0017] By adopting the above technical solution, reinforcing ribs and latches are provided. When in use, the reinforcing ribs connect the two columns, which can improve the strength of the columns and prevent the columns from being deformed after long-term use. The reinforcing ribs are then fixed to the two columns by the latches. When the latches are loosened, the reinforcing ribs can rotate. When the latches are tightened, the rotated reinforcing ribs can be re-fixed on the columns.

[0018] The utility model is further configured as follows: an anti-slip pad is provided on the lower surface of the column.

[0019] By adopting the above technical solution, the anti-skid pad is provided. When in use, the anti-skid pad contacts the ground, which can increase the friction between the column and the ground, thereby improving the stability of the column.

[0020] The utility model is further configured as follows: a seat plate is provided on one side of the connecting cross bar, an elastic clamping ring is provided on the seat plate, the elastic clamping rings are four in number and are symmetrically arranged, and the elastic clamping rings can be engaged with the connecting cross bar and the reinforcing ribs.

[0021] By adopting the above technical solution, a seat plate and an elastic clamping ring are provided. When the seat plate is not in use, the seat plate can be fixed to the connecting cross bar by the elastic clamping ring, which is convenient for carrying. When the user needs to rest, the two reinforcing ribs are first set horizontally by the latch, and then the seat plate is removed from the connecting cross bar, and the seat plate is fixed to the two reinforcing ribs by the elastic clamping ring. The user can sit on the seat plate to rest. The seat plate is clamped on the reinforcing ribs by the elastic clamping ring, and the elastic force of the elastic clamping ring to restore the deformation can fix the seat plate to the reinforcing ribs to prevent the seat plate from falling off and affecting the use. In addition, the two reinforcing ribs fix the two ends of the seat plate to make the seat plate horizontal to prevent the seat plate from shaking.

[0022] In summary, the utility model has the following beneficial effects:

[0023] By setting a rotating sleeve, a locking column and a fixed sleeve, when in use, the connecting cross bar is first fixed on the locking column and can rotate in the rotating sleeve, and the connecting cross bar is fixed in the rotating sleeve by the locking column and the fixed sleeve. When the holding frame needs to be rotated, the fixed sleeve is loosened, so that the locking column drives the connecting cross bar to rotate in the rotating sleeve, so that the holding frame contacts the connecting cross bar, thereby reducing the space occupied by the device, and then the fixing sleeve fixes the locking column, thereby fixing the connecting cross bar on the rotating sleeve.

[0024] By setting a clamping block, a clamping slot, a limit plate and a spring, when the holding frame contacts the connecting cross bar, the clamping block enters into the clamping slot, and the side wall of the clamping block can squeeze the limit plate and then squeeze the spring. When the clamping block completely enters into the clamping slot, the clamping block is fixed in the clamping slot by the force of the spring to restore the deformation.

[0025] Based on the above improvements, the overall technical effect achieved by the device is that the gripping rod and the column can be rotated so that the gripping rod and the column are in contact with the connecting cross bar, and the device can be folded for easy storage and carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0027] Figure 2 It is a structural schematic diagram of the latch, seat plate and reinforcing ribs of the utility model;

[0028] Figure 3 It is a structural schematic diagram of the locking mechanism of the utility model;

[0029] Figure 4 It is a structural schematic diagram of the clamping groove, the limiting plate and the spring of the utility model;

[0030] Figure 5 It is a structural schematic diagram of the rotating mechanism of the utility model;

[0031] Figure 6 It is a structural schematic diagram of the column, the sliding cavity and the holding frame of the utility model.

[0032] In the figure, 1, column; 2, sliding cavity; 3, holding frame; 4, locking mechanism; 5, connecting cross bar; 6, rotating mechanism; 7, clamping block; 8, clamping groove; 9, limit plate; 10, spring; 11, holding handle; 12, anti-skid protrusion; 13, reinforcing rib; 14, anti-skid pad; 15, latch; 16, seat plate; 17, elastic snap ring; 401, locking sleeve; 402, elastic groove; 403, extrusion sleeve; 404, extrusion part; 601, rotating sleeve; 602, locking column; 603, fixed sleeve. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0034] Example:

[0035] See also Figure 1-Figure 6 The utility model provides a technical solution: a portable gait booster, comprising a column 1, the number of the columns 1 is four and they are symmetrically arranged, a sliding cavity 2 is arranged on the column 1, a gripping frame 3 is arranged in the sliding cavity 2, the number of the gripping frames 3 is two and they are symmetrically arranged, the gripping frames 3 are U-shaped, a locking mechanism 4 is arranged between the gripping frames 3 and the sliding cavity 2, a connecting cross bar 5 is arranged between the two gripping frames 3, and a rotating mechanism 6 is arranged between the connecting cross bar 5 and the gripping frames 3. By arranging the column 1, the sliding cavity 2, the gripping frame 3, the locking mechanism 4, the connecting cross bar 5 and the rotating mechanism 6, when in use, first slide The dynamic cavity 2 is set in the column 1, and then the holding frame 3 is made to slide up and down in the sliding cavity 2, the holding frame 3 is adjusted to a suitable height, and then the locking mechanism 4 is tightened, the holding frame 3 is fixed in the sliding cavity 2, and then the connecting cross bar 5 is used to connect the two holding frames 3 to form a whole. At this time, the user can move through the holding frame 3, and the holding frame 3 provides support for the user. When the device is not needed, the rotating mechanism 6 is released to make the holding frame 3 rotate in the rotating mechanism 6, and then the holding frame 3 is in contact with the connecting cross bar 5, thereby reducing the footprint of the device and facilitating storage and carrying.

[0036] refer to Figure 3The locking mechanism 4 includes a locking sleeve 401, an elastic groove 402, an extrusion sleeve 403 and an extrusion portion 404. The locking sleeve 401 is arranged at the upper end of the column 1. The locking sleeve 401 is elastically arranged. The elastic groove 402 is arranged on the locking sleeve 401. The number of elastic grooves 402 is several and arranged circumferentially. The extrusion sleeve 403 is threadedly connected to the locking sleeve 401. The extrusion portion 404 is arranged in the extrusion sleeve 403. The extrusion portion 404 is arranged in cooperation with the locking sleeve 401. By arranging the locking sleeve 401, the elastic groove 402, the extrusion sleeve 403 and the extrusion portion 404, when the holding frame 3 is in the sliding When the extrusion sleeve 403 moves to a suitable height in the movable chamber 2, the extrusion sleeve 403 is rotated downward. Due to the threaded rotation of the extrusion sleeve 403 and the locking sleeve 401, the extrusion sleeve 403 can move on the locking sleeve 401. An elastic groove 402 is opened in the locking sleeve 401 to make the upper end of the locking sleeve 401 elastic. When the extrusion sleeve 403 moves downward, the extrusion portion 404 can squeeze the upper end of the locking sleeve 401, thereby making the locking sleeve 401 contact with the holding frame 3 and fixing the holding frame 3. When the extrusion sleeve 403 contacts the bottom of the locking sleeve 401, the holding frame 3 is fixed in the sliding chamber 2.

[0037] refer to Figure 5 The rotating mechanism 6 includes a rotating sleeve 601, a locking column 602 and a fixed sleeve 603. The rotating sleeve 601 is arranged on the holding frame 3. Both ends of the connecting cross bar 5 are arranged inside the rotating sleeve 601. The locking column 602 passes through the rotating sleeve 601 and the connecting cross bar 5. The fixed sleeve 603 is threadedly connected to the lower end of the locking column 602. By setting the rotating sleeve 601, the locking column 602 and the fixed sleeve 603, when in use, the connecting cross bar 5 is first fixed on the locking column 602 and can be rotated. The movable sleeve 601 rotates, and the connecting cross bar 5 is fixed in the rotating sleeve 601 by the locking column 602 and the fixed sleeve 603. When the holding frame 3 needs to be rotated, the fixed sleeve 603 is loosened, so that the locking column 602 drives the connecting cross bar 5 to rotate in the rotating sleeve 601, so that the holding frame 3 is in contact with the connecting cross bar 5, reducing the space occupied by the device, and then the fixed sleeve 603 fixes the locking column 602, thereby fixing the connecting cross bar 5 on the rotating sleeve 601.

[0038] refer to Figure 1 and Figure 4A clamping block 7 is provided on the holding frame 3, and a clamping groove 8 is provided on the connecting cross bar 5. The number of the clamping grooves 8 is two and they are symmetrically arranged. A limiting plate 9 is provided inside the clamping groove 8, and a spring 10 is provided on the limiting plate 9. The other end of the spring 10 is provided on the inner wall of the clamping groove 8. By setting the clamping block 7, the clamping groove 8, the limiting plate 9 and the spring 10, when the holding frame 3 contacts the connecting cross bar 5, at this time, the clamping block 7 enters the clamping groove 8, and the side wall of the clamping block 7 can squeeze the limiting plate 9, and then squeeze the spring 10. When the clamping block 7 completely enters the clamping groove 8, the clamping block 7 is fixed in the clamping groove 8 by the force of the spring 10 to restore the deformation.

[0039] refer to Figure 6 A gripping handle 11 is provided on the gripping frame 3, and an anti-slip protrusion 12 is provided on the gripping handle 11. By providing the gripping handle 11 and the anti-slip protrusion 12, when in use, first the gripping handle 11 can provide a fulcrum for the user, and then the anti-slip protrusion 12 can increase the friction between the user's palm and the gripping handle 11 to avoid hand slippage.

[0040] refer to Figure 1 A reinforcing rib 13 is rotatably arranged between the two columns 1, and the reinforcing rib 13 is arranged in a U shape. A latch 15 is arranged between the reinforcing rib 13 and the column 1. By arranging the reinforcing rib 13 and the latch 15, when in use, the reinforcing rib 13 connects the two columns 1, which can improve the strength of the column 1 and prevent the column 1 from deforming after long-term use. Then the reinforcing rib 13 is fixed to the two columns 1 by the latch 15. When the latch 15 is loosened, the reinforcing rib 13 can be rotated. When the latch 15 is tightened, the rotated reinforcing rib 13 can be fixed to the column 1 again.

[0041] refer to Figure 1 The lower surface of the column 1 is provided with an anti-skid pad 14. By providing the anti-skid pad 14, when in use, the anti-skid pad 14 contacts the ground, which can increase the friction between the column 1 and the ground, thereby improving the stability of the column 1.

[0042] refer to Figure 1 and Figure 2A seat plate 16 is provided on one side of the connecting cross bar 5, and an elastic snap ring 17 is provided on the seat plate 16. There are four elastic snap rings 17 and they are symmetrically arranged. The elastic snap rings 17 can be engaged with the connecting cross bar 55 and the reinforcing ribs 13. By arranging the seat plate 16 and the elastic snap rings 17, when the seat plate 16 is not in use, the seat plate can be fixed to the connecting cross bar 5 by the elastic snap rings 17, which is convenient for carrying. When the user needs to rest, firstly, the two reinforcing ribs 13 are arranged horizontally by the latch 15, and then The seat plate 16 is removed from the connecting cross bar 5 and fixed to the two reinforcing ribs 13 by means of an elastic snap ring 17 so that the user can sit on the seat plate 16 to rest. The seat plate 16 is clamped to the reinforcing ribs 13 by means of the elastic snap ring 17. The elastic force of the elastic snap ring 17 to restore the deformation can fix the seat plate 16 to the reinforcing ribs 13 to prevent the seat plate 16 from falling and affecting the use. In addition, the two reinforcing ribs 13 fix the two sides of the seat plate 16 to keep the seat plate 16 in a horizontal state to prevent the seat plate 16 from shaking.

[0043] Brief description of the use process: When in use, first the sliding cavity 2 is set in the column 1, and then the holding frame 3 is slid up and down in the sliding cavity 2, the holding frame 3 is adjusted to a suitable height, and the extrusion sleeve 403 is rotated downward. Due to the threaded rotation of the extrusion sleeve 403 and the locking sleeve 401, the extrusion sleeve 403 can move on the locking sleeve 401, and an elastic groove 402 is provided in the locking sleeve 401, so that the upper end of the locking sleeve 401 has elasticity. When the extrusion sleeve 403 moves downward, the extrusion part 404 can squeeze the upper end of the locking sleeve 401, so that the locking sleeve 401 contacts the holding frame 3 and the holding frame 3 moves. When the extrusion sleeve 403 contacts the bottom of the locking sleeve 401, the holding frame 3 is fixed in the sliding cavity 2. At this time, the user can move through the holding frame 3, and the holding frame 3 provides support for the user. When the device is not needed, the connecting cross bar 5 is fixed on the locking column 602 and can be rotated in the rotating sleeve 601. The connecting cross bar 5 is fixed in the rotating sleeve 601 through the locking column 602 and the locking sleeve 401. When the holding frame 3 needs to be rotated, the locking sleeve 401 is released, so that the locking column 602 drives the connecting cross bar 5 to rotate in the rotating sleeve 601, so that the holding frame 3 and the connecting cross bar 5 are connected. The cross bar 5 is in contact with each other to reduce the space occupied by the device, and then the locking sleeve 401 is used to fix the locking column 602, thereby fixing the connecting cross bar 5 on the rotating sleeve 601. Then, when the holding frame 3 is in contact with the connecting cross bar 5, at this time, the clamping block 7 enters the clamping groove 8, and the side wall of the clamping block 7 can squeeze the limit plate 9, thereby squeezing the spring 10. When the clamping block 7 completely enters the clamping groove 8, the clamping block 7 is fixed in the clamping groove 8 by the force of the spring 10 to restore the deformation. Then, when the seat plate 16 is not in use, the seat plate can be fixed to the connecting cross bar 5 through the elastic clamping ring 17, which is convenient for When the user needs to take a rest, first, the two reinforcing ribs 13 are set horizontally through the pin 15, and then the seat plate 16 is removed from the connecting cross bar 5, and the seat plate 16 is fixed to the two reinforcing ribs 13 through the elastic snap ring 17, so that the user can sit on the seat plate 16 to rest, and the seat plate 16 is clamped on the reinforcing ribs 13 through the elastic snap ring 17, and the elastic force of the elastic snap ring 17 to restore the deformation can fix the seat plate 16 on the reinforcing rib 13 to prevent the seat plate 16 from falling and affecting the use, and the two reinforcing ribs 13 fix the two sides of the seat plate 16 to make the seat plate 16 in a horizontal state to prevent the seat plate 16 from shaking.

[0044] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A portable gait assist device, comprising a column (1), characterized in that: The number of the upright posts (1) is four and they are symmetrically arranged; the upright posts (1) are provided with a sliding cavity (2); a holding frame (3) is provided in the sliding cavity (2); the number of the holding frames (3) is two and they are symmetrically arranged; the holding frames (3) are U-shaped; a locking mechanism (4) is provided between the holding frames (3) and the sliding cavity (2); a connecting cross bar (5) is provided between the two holding frames (3); and a rotating mechanism (6) is provided between the connecting cross bar (5) and the holding frames (3).

2. A portable gait assist device according to claim 1, characterized in that: The locking mechanism (4) comprises a locking sleeve (401), an elastic groove (402), an extrusion sleeve (403) and an extrusion portion (404); the locking sleeve (401) is arranged at the upper end of the column (1); the locking sleeve (401) is elastically arranged; the elastic groove (402) is arranged on the locking sleeve (401); the elastic grooves (402) are multiple and arranged circumferentially; the extrusion sleeve (403) is threadedly connected to the locking sleeve (401); the extrusion portion (404) is arranged in the extrusion sleeve (403); and the extrusion portion (404) is arranged in cooperation with the locking sleeve (401).

3. A portable gait assist device according to claim 1, characterized in that: The rotating mechanism (6) comprises a rotating sleeve (601), a locking column (602) and a fixed sleeve (603); the rotating sleeve (601) is arranged on the holding frame (3); both ends of the connecting cross bar (5) are arranged inside the rotating sleeve (601); the locking column (602) passes through the rotating sleeve (601) and the connecting cross bar (5); and the fixed sleeve (603) is threadedly connected to the lower end of the locking column (602).

4. A portable gait assist device according to claim 1, characterized in that: The holding frame (3) is provided with a clamping block (7), the connecting cross bar (5) is provided with a clamping groove (8), the number of the clamping grooves (8) is two and they are symmetrically arranged, a limiting plate (9) is arranged inside the clamping groove (8), the limiting plate (9) is provided with a spring (10), and the other end of the spring (10) is arranged on the inner wall of the clamping groove (8).

5. The portable gait assist device according to claim 1, characterized in that: The holding frame (3) is provided with a holding handle (11), and the holding handle (11) is provided with an anti-slip protrusion (12).

6. The portable gait assist device according to claim 1, characterized in that: A reinforcing rib (13) is rotatably arranged between the two upright posts (1), the reinforcing rib (13) is arranged in a U shape, and a latch (15) is arranged between the reinforcing rib (13) and the upright post (1).

7. A portable gait assist device according to claim 1, characterized in that: The lower surface of the column (1) is provided with an anti-slip pad (14).

8. The portable gait assist device according to claim 1, characterized in that: A seat plate (16) is provided on one side of the connecting cross bar (5), and an elastic snap ring (17) is provided on the seat plate (16). The elastic snap rings (17) are four in number and are symmetrically arranged. The elastic snap rings (17) can be engaged with the connecting cross bar (5) and the reinforcing rib (13).

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