Folding support frame and folding table

Abstract

A folding type supporting frame and a folding table comprise two supporting rods and two folding supporting leg assemblies, each folding supporting leg assembly comprises two supporting legs, two upper connecting rods, two lower connecting rods, an upper connecting base, a lower connecting base, a pull rod, two reinforcing rods and a sliding base, the upper ends of the two supporting legs are rotationally connected with the corresponding ends of the two supporting rods respectively, and the lower ends of the two supporting legs are rotationally connected with the corresponding ends of the two supporting rods respectively. One ends of the two upper connecting rods are rotationally connected with the upper ends of the supporting legs on the same side respectively, the other ends of the two upper connecting rods are rotationally connected with the two ends of the upper connecting base respectively, one ends of the two lower connecting rods are rotationally connected with the lower ends of the supporting legs on the same side respectively, and the other ends of the two lower connecting rods are rotationally connected with the two ends of the lower connecting base respectively; one end of each reinforcing rod is rotatably connected with the upper connecting rod on the same side or the supporting leg on the same side, and the other end of each reinforcing rod is rotatably connected with the two ends of the sliding base which sleeves the pull rod in a sliding mode and can slide up and down along the pull rod. The folding chair is high in supporting stability when unfolded for use, easy to fold and easy and labor-saving to operate.

Description

Technical Field

[0001] The utility model relates to the field of daily necessities, in particular to a foldable support frame and a foldable table. Background Art

[0002] Folding tables are commonly used equipment in outdoor activities. They can be unfolded when in use and folded up when not in use without taking up too much space. They are deeply loved by consumers.

[0003] For example, Chinese utility model patent CN217937505U discloses a folding table, including a panel and a support frame, wherein the support frame includes two support rods and two support assemblies, the support assembly includes a connecting assembly and two support legs, the upper ends of the two support legs are rotatably connected to the two support rods respectively, the connecting assembly includes a group of connecting rods, the group of connecting rods includes two connecting rods that are cross-arranged and rotatably connected, the upper ends of the two connecting rods are respectively rotatably connected to a support rod, and the lower ends of the two connecting rods are respectively rotatably connected to the lower end of a support leg. When this folding table is folded and stored, after the two support legs are rotated inward and folded, the two support rods need to be pushed toward each other so that the two cross-arranged connecting rods can be folded and retracted, so the folding operation is not easy and labor-saving enough. In addition, the support stability of the folding table when it is unfolded and used needs to be improved. Utility Model Content

[0004] The utility model aims to provide a foldable support frame and a foldable table which have high support stability when unfolded and are easy to fold and operate with ease and labor saving.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] The foldable support frame comprises two support rods arranged in parallel and spaced apart in the front-to-back direction and two foldable leg assemblies respectively arranged at the left and right lower ends of the two support rods; each foldable leg assembly comprises two support legs, two upper connecting rods, two lower connecting rods, an upper connecting seat, a lower connecting seat, a pull rod, two reinforcing rods and a sliding seat; the upper ends of the two support legs are rotatably connected to the corresponding ends of the two support rods, so that the two legs can be rotated inwardly and folded or rotated outwardly and unfolded relative to the two support rods in the left and right directions; the two upper connecting rods are arranged front-to-back between the upper ends of the two support legs, and one end of the two upper connecting rods is rotatably connected to the upper end of the leg on the same side, and the other end of the two upper connecting rods is rotatably connected to the two ends of the upper connecting seat; the two lower connecting rods are arranged front-to-back between the lower ends of the two support legs, and the One end is rotatably connected to the lower end of the leg on the same side, and the other ends of the two lower connecting rods are rotatably connected to the two ends of the lower connecting seat; the upper end of the pull rod is connected to the upper connecting seat, and the lower end of the pull rod is connected to the lower connecting seat; the two reinforcing rods are arranged between the two legs in a front-to-back manner, and one end of the two reinforcing rods is rotatably connected to the upper connecting rod or the leg on the same side, and the other ends of the two reinforcing rods are rotatably connected to the two ends of the sliding seat, and the sliding seat is slidable on the pull rod and can slide up and down along the pull rod; when the pull rod is lifted, the two upper connecting rods, the two lower connecting rods and the two reinforcing rods can be expanded or folded, and the two upper connecting rods, the two lower connecting rods and the two reinforcing rods make the two legs and the two support rods move away from each other when expanded, and the two upper connecting rods, the two lower connecting rods and the two reinforcing rods make the two legs and the two support rods move closer to each other when folded.

[0007] Furthermore, when the two reinforcing rods are in the unfolded position, the upper end of the slide seat abuts against the lower end of the upper connecting seat, and when the two reinforcing rods switch from the unfolded position to the folded position, the slide seat slides in a direction close to the lower connecting seat.

[0008] Furthermore, when the two reinforcing rods are in the deployed position, they are respectively inclined downward from one end rotatably connected to the upper connecting rod or the support leg on the same side to one end rotatably connected to the sliding seat, and when the two reinforcing rods switch from the deployed position to the folded position, one end of the two reinforcing rods rotatably connected to the sliding seat moves along with the sliding seat toward the direction approaching the lower connecting seat, and the ends of the two reinforcing rods rotatably connected to the upper connecting rod or the support leg on the same side approach each other.

[0009] Furthermore, when the two upper connecting rods are in the expanded position, they are respectively inclined upward from one end rotatably connected to the upper end of the support leg on the same side to the other end rotatably connected to the upper connecting seat, and when the two upper connecting rods switch from the expanded position to the folded position, the one end of the two upper connecting rods rotatably connected to the upper connecting seat moves along with the upper connecting seat in the direction away from the lower connecting seat, and the one ends of the two upper connecting rods rotatably connected to the upper end of the support leg on the same side approach each other.

[0010] Furthermore, when the two lower connecting rods are in the expanded position, they are respectively inclined upward from one end rotatably connected to the lower end of the same-side support leg to the other end rotatably connected to the lower connecting seat, and when the two lower connecting rods switch from the expanded position to the folded position, one end of the two lower connecting rods rotatably connected to the lower connecting seat moves along with the lower connecting seat toward the direction approaching the upper connecting seat, and the ends of the two lower connecting rods rotatably connected to the lower end of the same-side support leg approach each other.

[0011] Furthermore, the two reinforcing rods are respectively located on the inner sides of the two upper connecting rods.

[0012] Furthermore, a connecting piece is fixedly provided on the inner side of the upper end and the inner side of the lower end of the two legs, one end of the two upper connecting rods is rotatably connected to the connecting piece on the inner side of the upper end of the two legs, and one end of the two lower connecting rods is rotatably connected to the connecting piece on the inner side of the lower end of the two legs.

[0013] Furthermore, each foldable leg assembly has a limit pin protruding outward at the upper end of the two legs, and the limit pin includes a rod portion and a stop cap portion located outside the rod portion. The left and right ends of the two support rods are rotatably connected to a locking plate, and the free end of the locking plate is provided with a limit snap-in. By clamping the limit snap-in of the locking plate onto the rod portion of the limit pin, the corresponding leg can be locked in the unfolded state.

[0014] A folding table, comprising a table top assembly and a folding support frame as described above, wherein the two support rods are respectively provided with first shoulders extending to both ends along their respective length directions on the inner sides facing each other, the table top assembly comprises a left end plate, a right end plate, a front end plate, a rear end plate and a middle plate, the left end plate is placed on the left end of the first shoulders of the two support rods, the right end plate is placed on the right end of the first shoulders of the two support rods, the front end plate is placed on the first shoulder of the support rod at the front end and the left end plate and the right end plate, and the rear end plate is placed on the support rod at the rear end The first shoulder of the rod and the left and right end plates, the front and rear end plates are respectively provided with second shoulders extending to both ends along their respective length directions on the inner sides facing each other, the front and rear sides of the middle plate are respectively placed on the second shoulders of the front and rear end plates, the left and right ends of the middle plate are respectively stopped by the left and right end plates, the middle plate is a foldable plate structure formed by a plurality of plate units connected in sequence by rotation, and the left and right ends of the two support rods are also respectively provided with stoppers for preventing the left and right end plates from sliding outwards.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] Firstly, after the folding support frame and folding table of the utility model are unfolded, on the one hand, the two upper connecting rods, two lower connecting rods, upper connecting seat, lower connecting seat and pull rod arranged between the two legs at each end form a support frame that is roughly I-shaped; on the other hand, the arrangement of the two reinforcing rods and the sliding seat can play a certain locking role on the I-shaped support frame; on still another hand, the two legs arranged at each end are locked by a locking plate, thereby effectively improving the stability of the support and ensuring safe use.

[0017] Secondly, when the foldable support frame and foldable table of the utility model are folded and stored, after the two legs at each end are rotated inward and folded, it is only necessary to pull the pull rod to fold the I-shaped support frame and bring the two legs and the two support rods closer to each other, so the folding operation is easier and more labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a foldable support frame according to an embodiment of the utility model.

[0019] Figure 2 yes Figure 1 A partial enlarged view of middle A.

[0020] Figure 3 yes Figure 1 A partial enlarged view of B.

[0021] Figure 4 yes Figure 1 A partial enlarged view of C in the middle.

[0022] Figure 5 It is a schematic diagram of the disengagement of the locking plate and the limiting pin in the utility model.

[0023] Figure 6 It is a side view of a foldable support frame of an embodiment of the utility model, and illustrates a structure in which one end of two reinforcing rods are rotatably connected to the upper connecting rods on the same side.

[0024] Figure 7 It is a side view of a foldable support frame of another embodiment of the utility model, and illustrates a structure in which one end of two reinforcing rods are rotatably connected to the supporting legs on the same side.

[0025] Figure 8 This is a diagram of the folding state of the foldable support frame of the utility model.

[0026] Fig. 9 The utility model is a three-dimensional diagram of a folding table.

[0027] Fig.10 The utility model is an exploded view of a folding table. DETAILED DESCRIPTION

[0028] The utility model is further described in detail below with reference to the embodiments given in the accompanying drawings.

[0029] like Figures 1 to 8 As shown, the utility model provides a foldable support frame, comprising two support rods 11, 12 arranged in parallel and spaced apart in the front-to-back direction and two foldable leg assemblies 2a, 2b respectively arranged at the left and right lower ends of the two support rods 11, 12.

[0030] Each foldable leg assembly 2a, 2b includes: two legs 211, 212, two upper connecting rods 221, 222, two lower connecting rods 231, 232, an upper connecting seat 24, a lower connecting seat 25, a pull rod 26, two reinforcing rods 271, 272, and a sliding seat 28.

[0031] The upper ends of the two legs 211, 212 are rotatably connected to the corresponding ends of the two support rods 11, 12, so that the two legs 211, 212 can be rotated inwardly and folded or rotated outwardly and unfolded relative to the two support rods 11, 12 along the left and right directions. The two upper connecting rods 221, 222 are arranged front and back between the upper ends of the two legs 211, 212, and one end of the two upper connecting rods 221, 222 is rotatably connected to the upper ends of the legs 211, 212 on the same side, and the other ends of the two upper connecting rods 221, 222 are rotatably connected to the two ends of the upper connecting seat 24. The two lower connecting rods 231, 232 are arranged front and back between the lower ends of the two legs 211, 212, and one end of the two lower connecting rods 231, 232 is rotatably connected to the lower ends of the legs 211, 212 on the same side, and the other ends of the two lower connecting rods 231, 232 are rotatably connected to the two ends of the lower connecting seat 25. The upper end of the pull rod 26 is connected to the upper connecting seat 24, and the lower end of the pull rod 26 is connected to the lower connecting seat 25. The two reinforcing rods 271, 272 are arranged between the two legs 211, 212 in a front-to-back manner, and one end of the two reinforcing rods 271, 272 is respectively rotatably connected to the upper connecting rods 221, 222 or the legs 211, 212 on the same side, and the other ends of the two reinforcing rods 271, 272 are respectively rotatably connected to the two ends of the slide 28, and the slide 28 is slidably sleeved on the pull rod 26 and can slide up and down along the pull rod 26.

[0032] When the pull rod 26 is lifted, the two upper connecting rods 221 and 222, the two lower connecting rods 231 and 232 and the two reinforcing rods 271 and 272 can be expanded or folded, and the two upper connecting rods 221 and 222, the two lower connecting rods 231 and 232 and the two reinforcing rods 271 and 272 make the two legs 211, 212 and the two support rods 11, 12 move away from each other when they are expanded, and make the two upper connecting rods 221 and 222, the two lower connecting rods 231 and 232 and the two reinforcing rods 271 and 272 move the two legs 211, 212 and the two support rods 11, 12 move closer to each other when they are folded.

[0033] In a preferred example of the present invention, when the two reinforcing rods 271 and 272 are in the expanded position, the upper end of the slide 28 abuts against the lower end of the upper connecting seat 24, and when the two reinforcing rods 271 and 272 switch from the expanded position to the folded position, the slide 28 slides toward the direction close to the lower connecting seat 25.

[0034] In a preferred example of the utility model, when the two reinforcing rods 271, 272 are in the expanded position, they are respectively inclined downward from one end rotatably connected to the upper connecting rod 221, 222 on the same side or the supporting legs 211, 212 on the same side to one end rotatably connected to the slide 28, and when the two reinforcing rods 271, 272 are switched from the expanded position to the folded position, one end of the two reinforcing rods 271, 272 rotatably connected to the slide 28 moves along with the slide 28 toward the direction approaching the lower connecting seat 25, and one end of the two reinforcing rods 271, 272 rotatably connected to the upper connecting rod 221, 222 on the same side or the supporting legs 211, 212 on the same side approach each other.

[0035] In a preferred example of the utility model, when the two upper connecting rods 221, 222 are in the expanded position, they are respectively inclined upward from one end rotatably connected to the upper end of the support legs 211, 212 on the same side to the other end rotatably connected to the upper connecting seat 24, and when the two upper connecting rods 221, 222 are switched from the expanded position to the folded position, the one end of the two upper connecting rods 221, 222 rotatably connected to the upper connecting seat 24 moves along with the upper connecting seat 24 in a direction away from the lower connecting seat 25, and the one end of the two upper connecting rods 221, 222 rotatably connected to the upper end of the support legs 211, 212 on the same side approaches each other.

[0036] In a preferred example of the utility model, when the two lower connecting rods 231, 232 are in the expanded position, they are respectively inclined upward from one end rotatably connected to the lower end of the same-side supporting legs 211, 212 to one end rotatably connected to the lower connecting seat 25, and when the two lower connecting rods 231, 232 are switched from the expanded position to the folded position, one end of the two lower connecting rods 231, 232 rotatably connected to the lower connecting seat 25 moves along with the lower connecting seat 25 toward the direction approaching the upper connecting seat 24, and the ends of the two lower connecting rods 231, 232 rotatably connected to the lower ends of the same-side supporting legs 211, 212 approach each other.

[0037] In a preferred embodiment of the present invention, the two reinforcing rods 271 , 272 are located on the inner sides of the two upper connecting rods 221 , 222 , respectively.

[0038] In a preferred example of the present invention, a connecting piece 3 is fixedly provided on the inner side of the upper end and the inner side of the lower end of the two legs 211, 212, one end of the two upper connecting rods 221, 222 is rotatably connected to the connecting piece 3 on the inner side of the upper end of the two legs 211, 212, and one end of the two lower connecting rods 231, 232 is rotatably connected to the connecting piece 3 on the inner side of the lower end of the two legs 211, 212.

[0039] In a preferred example of the utility model, a limit pin 4 is protruding outward from the upper ends of the two legs 211, 212 of each foldable leg assembly 2a, 2b, and the limit pin 4 includes a rod portion 41 and a stop cap portion 42 located on the outside of the rod portion 41. The left and right ends of the two support rods 11, 12 are rotatably connected to a locking plate 5, and the free end of the locking plate 5 is provided with a limit snap-in 51. By clamping the limit snap-in 51 of the locking plate 5 on the rod portion 41 of the limit pin 4, the corresponding leg can be locked in the unfolded state. Conversely, the locking plate 5 can be rotated in the opposite direction to allow its upper limit snap-in 51 to disengage from the rod portion 41 of the limit pin 4, so that the corresponding leg can be unlocked.

[0040] As described above, the folding process of the foldable support frame of the utility model is as follows: first, release the lock of each locking plate 5 on the corresponding support leg, then, the two foldable leg assemblies 2a, 2b are respectively rotated inward and folded until they are close to the two support rods 11, 12, and then, the pull rod 26 is pulled outward to make the two upper connecting rods 221 and 222, the two lower connecting rods 231 and 232 and the two reinforcing rods 271 and 272 rotate and fold, so that the two legs 211, 212 and the two support rods 11, 12 are brought closer to each other.

[0041] like Fig. 9 and Fig.10 As shown, a folding table provided by the utility model comprises a table top assembly 7 and the folding support frame 9 as described above, wherein the inner sides of the two support rods 11 and 12 facing each other are respectively provided with first shoulders 111 and 121 extending to both ends along their respective length directions, and the table top assembly 7 comprises a left end plate 71, a right end plate 72, a front end plate 73, a rear end plate 74 and a middle plate 75, the left end plate 71 is placed on the left ends of the first shoulders 111 and 121 of the two support rods 11 and 12, the right end plate 72 is placed on the right ends of the first shoulders 111 and 112 of the two support rods 11 and 12, and the front end plate 73 is placed on the first shoulder 111 of the support rod 11 located at the front end and the left end plate 71 and the right end plate 72 The rear end plate 74 is placed on the first shoulder 121 of the support rod 12 located at the rear end and the left end plate 71 and the right end plate 72, and the front end plate 73 and the rear end plate 74 are respectively provided with second shoulders 731 and 741 extending to both ends along their respective length directions on the inner sides facing each other, and the front and rear sides of the middle plate 75 are respectively placed on the second shoulders 731 and 741 of the front end plate 73 and the rear end plate 74, and the left and right ends of the middle plate 75 are respectively stopped by the left end plate 71 and the right end plate 72, and the middle plate 75 is a foldable plate structure formed by a plurality of plate units connected in sequence by rotation, and the left and right ends of the two support rods 11 and 12 are also respectively provided with stoppers 8 for preventing the left end plate 71 and the right end plate 72 from sliding outward.

[0042] As described above, when the folding table of the utility model is stored, the middle plate 75, the front end plate 73, the rear end plate 74, the left end plate 71, and the right end plate 72 can be removed from the folding support frame 9 in turn, and then the middle plate 75 and the folding support frame 9 can be folded respectively, and finally the folded middle plate 75 and the folding support frame 9 can be stored together with the front end plate 73, the rear end plate 74, the left end plate 71, and the right end plate 72 that have been removed above, thereby reducing the space occupied by the folding table when it is stored.

[0043] The above is only a preferred embodiment of the present utility model, and it cannot be used to limit the scope of the present utility model. That is, all simple equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the utility model description are still within the scope of the present utility model patent.

Claims

1. A foldable support frame, comprising two support rods arranged in parallel and spaced apart in the front-to-back direction and two foldable leg assemblies respectively arranged at the left and right lower ends of the two support rods; characterized in that: Each foldable leg assembly includes two legs, two upper connecting rods, two lower connecting rods, an upper connecting seat, a lower connecting seat, a pull rod, two reinforcing rods and a sliding seat; The upper ends of the two legs are rotatably connected to the corresponding ends of the two support rods, so that the two legs can be rotated inwardly and folded or rotated outwardly and unfolded relative to the two support rods in the left and right directions; The two upper connecting rods are arranged front and back relative to each other between the upper ends of the two supporting legs, and one end of the two upper connecting rods is rotatably connected to the upper end of the supporting leg on the same side, and the other end of the two upper connecting rods is rotatably connected to the two ends of the upper connecting seat; The two lower connecting rods are arranged front and back relative to each other between the lower ends of the two supporting legs, and one end of the two lower connecting rods is rotatably connected to the lower end of the supporting leg on the same side, and the other end of the two lower connecting rods is rotatably connected to the two ends of the lower connecting seat; The upper end of the pull rod is connected to the upper connecting seat, and the lower end of the pull rod is connected to the lower connecting seat; The two reinforcing rods are arranged between the two legs in a front-to-back manner, and one end of the two reinforcing rods is rotatably connected to the upper connecting rod or the leg on the same side, and the other end of the two reinforcing rods is rotatably connected to the two ends of the sliding seat, respectively. The sliding seat is slidably sleeved on the pull rod and can slide up and down along the pull rod; When the pull rod is lifted, the two upper connecting rods, the two lower connecting rods and the two reinforcing rods can be expanded or folded, and the two upper connecting rods, the two lower connecting rods and the two reinforcing rods make the two legs and the two support rods move away from each other when the two upper connecting rods, the two lower connecting rods and the two reinforcing rods are expanded, and the two legs and the two support rods move closer to each other when the two upper connecting rods, the two lower connecting rods and the two reinforcing rods are folded.

2. A foldable support frame according to claim 1, characterized in that: When the two reinforcing rods are in the unfolded position, the upper end of the slide seat abuts against the lower end of the upper connecting seat, and when the two reinforcing rods switch from the unfolded position to the folded position, the slide seat slides towards the direction close to the lower connecting seat.

3. A foldable support frame according to claim 1, characterized in that: When the two reinforcing rods are in the expanded position, they are respectively inclined downward from one end rotatably connected to the upper connecting rod or the support leg on the same side to the other end rotatably connected to the sliding seat, and when the two reinforcing rods switch from the expanded position to the folded position, the one end of the two reinforcing rods rotatably connected to the sliding seat moves with the sliding seat toward the direction approaching the lower connecting seat, and the one ends of the two reinforcing rods rotatably connected to the upper connecting rod or the support leg on the same side approach each other.

4. A foldable support frame according to claim 1, characterized in that: When the two upper connecting rods are in the expanded position, they are respectively inclined upward from one end rotatably connected to the upper end of the support leg on the same side to the other end rotatably connected to the upper connecting seat, and when the two upper connecting rods switch from the expanded position to the folded position, the one end of the two upper connecting rods rotatably connected to the upper connecting seat moves along with the upper connecting seat in the direction away from the lower connecting seat, and the one ends of the two upper connecting rods rotatably connected to the upper end of the support leg on the same side approach each other.

5. The foldable support frame according to claim 1, characterized in that: When the two lower connecting rods are in the expanded position, they are respectively inclined upward from one end rotatably connected to the lower end of the leg on the same side to the other end rotatably connected to the lower connecting seat, and when the two lower connecting rods switch from the expanded position to the folded position, one end of the two lower connecting rods rotatably connected to the lower connecting seat moves along with the lower connecting seat toward the direction approaching the upper connecting seat, and the other ends of the two lower connecting rods rotatably connected to the lower end of the leg on the same side approach each other.

6. The foldable support frame according to claim 1, characterized in that: The two reinforcing rods are respectively located on the inner sides of the two upper connecting rods.

7. A foldable support frame according to any one of claims 1 to 6, characterized in that: A connecting piece is fixedly provided on the inner side of the upper end and the inner side of the lower end of the two legs, one end of the two upper connecting rods is rotatably connected to the connecting piece on the inner side of the upper end of the two legs, and one end of the two lower connecting rods is rotatably connected to the connecting piece on the inner side of the lower end of the two legs.

8. A foldable support frame according to any one of claims 1 to 6, characterized in that: The upper ends of the two legs of each foldable leg assembly are provided with a limit pin protruding outward, and the limit pin includes a rod portion and a stop cap portion located outside the rod portion. The left and right ends of the two support rods are rotatably connected to a locking plate, and the free end of the locking plate is provided with a limit snap-in. By clamping the limit snap-in of the locking plate onto the rod portion of the limit pin, the corresponding leg can be locked in the unfolded state.

9. A folding table, characterized in that: The foldable support frame comprises a table top assembly and any one of claims 1 to 8, wherein the two support rods are respectively provided with first shoulders extending to both ends along their respective length directions on the inner sides facing each other, the table top assembly comprises a left end plate, a right end plate, a front end plate, a rear end plate and a middle plate, the left end plate is placed on the left end of the first shoulders of the two support rods, the right end plate is placed on the right end of the first shoulders of the two support rods, the front end plate is placed on the first shoulder of the support rod at the front end and the left end plate and the right end plate, and the rear end plate is placed on the The first shoulder of the support rod and the left and right end plates, the front and rear end plates are respectively provided with second shoulders extending to both ends along their respective length directions on the inner sides facing each other, the front and rear sides of the middle plate are respectively placed on the second shoulders of the front and rear end plates, the left and right ends of the middle plate are respectively stopped by the left and right end plates, the middle plate is a foldable plate structure formed by a plurality of plate units connected in sequence by rotation, and the left and right ends of the two support rods are also respectively provided with stoppers for preventing the left and right end plates from sliding outwards.

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