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(11) | EP 2 083 139 A2 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Mutual-constraint safety multi-drawer locking mechanism |
| (57) The present invention relates to a mutual-constraint safety multi-drawer locking
mechanism, consisting of a mounting bracket (1) formed by a main bottom plate (4),
an upper top plate (5), a lower bottom plate (6), a limit cover plate (7) and a curved
baffle plate (8), and a driving mechanism formed by a "L-type" base plate (21), a
lock-plate (22), a shaft pin (23) and a compression spring (24), and an action actuating
mechanism which formed by an optional-one model including a spindle and several sets
of shaft sleeve and a an all-drawer locked model including a lack lever, a fixed lock
piece and a sliding lock piece. The length of spindle is the sum of that of assembled
shaft sleeve components and the height of tilted surface on one rotary shaft sleeve,
so, only one rotary shaft sleeve has the rotary gap, thus only one drawer may be opened
each time. When the lock lever controls the lock head to block up the gap, all-drawer
may be locked up. Under only one drawer opened conditions, the other drawers shall
be never opened, thus it have high applicability.
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Technical field
[0001] The present invention relates to a mechanical locking mechanism, especially a mutual-constraint safety multi-drawer locking mechanism with a function of locking all-drawer each time, however, during using, only one drawer can be opened each time.
Background of the Invention
[0002] At present, the multi-drawer locking mechanism only has the function of locking all-drawer and unlocking all-drawer simultaneously. During opening one drawer for taking work pieces, all the other drawers shall be in the unlocked openable state, causing mutual interference and making several drawers simultaneously slide out. Especially when dealing with the multi-drawer toolbox and cabinet in a vibration or shaking conditions, the operator must be careful, otherwise it is easier to cause several other drawers to slide out simultaneously. Then the toolbox shall lose its gravity center, causing collapse, and the tools spilling on the ground or safety accidents happening. So the existing multi-drawer locking mechanism is unreasonable, it is necessary to improve it.
Summary of the invention
[0003] The purpose of present invention is to provide a mutual-constraint safety multi-drawer locking mechanism with the function of locking all-drawer, but during using, only one drawer can be opened each time, and that only after the opened drawer closed and reset, another drawer can be selected to open.
[0004] The main body of this mutual-constraint safety multi-drawer locking mechanism consists of a mounting bracket, a driving mechanism and an action actuating mechanism. It is characterized in that the mounting bracket is formed by a main bottom plate, an upper top plate, a lower bottom plate, a limit cover plate and a curved baffle plate. The main body of this main bottom plate is the strip "the right open box" shaped which shape like the figure of "⊏", formed by a middle bottom plate and left and right side rods. The left side plate is arranged with a shaft pin limit concave hole and a limit cover plate mounting hole. The right side plate is arranged with the shaft pin working hole at the place symmetrical to that of limit concave hole on the left side plate and limit mounting hole of curved baffle plate, the upper top plate is symmetrical and matched with the shape of the main body of the lower bottom plate, in "the right open box" shape matched with the main bottom plate, formed by the middle mounting surface with the spindle assembly hole and standby mounting hole and the left and right mounting supports with the assembly holes. The limit cover plate is arranged with a working hole and an assembly hole corresponding to the shaft pin limit concave hole and mounting hole on the left side plate. The curved baffle plate may prevent the deformation of the spindle, with the assembly hole corresponding to the limit mounting hole on the right side plate. The driving mechanism has a "L-type" base plate, a lock-plate, a shaft pin and a compression spring. The "L-type" base plate is arranged with a spring salient seat. The lock-plate is formed by the left and right bent side brims with the assembly hole on it, and top bent brim and middle supporting plate with the spring salient seat. The lower edge of the left bent side brim is arranged with the lock hook with the locking notch, the near-lower edge of the right bent side brim is extended with one hump limit clamping strip, one end of the shaft pin has the limit shoulder, under the assembled mode, the shaft pin is protruded into the assembly hole on the left and right bent side brim, and welded on the lock-plate. The action actuating mechanism consists of the optional-one drawer open actuating mechanism and all-drawer lock actuating mechanism. The optional-one drawer open actuating mechanism is formed by a spindle and several sets of shaft sleeve assemblies with the quantity matched to that of the drawers. The spindle is arranged with a longitudinal limit lead rail, with assembly screw holes at both ends, each set of shaft sleeve assembly includes a spring setting shaft sleeve, a rotary shaft sleeve, a driven shaft sleeve, a torsion spring and a spacing shaft sleeve. The inner of the spring setting shaft sleeve is arranged with the limit guide groove matched with the longitudinal guide rail on the spindle, and its outer is arranged with the spring salient seat. The inner of the rotary shaft sleeve has the sector radian limit guide groove with the depth matched with the longitudinal guide rail on the spindle, permitting the rotary shaft sleeve to rotate 90°on the spindle, and its outer has the limit salient strip with the spring mounting hole, and its top end surface has the upper salient working surface formed by the tilted surface and the flat and straight sliding surface. The inner of the driven shaft sleeve has the limit guide groove matched with the longitudinal guide rail on the spindle, the lower end face has the concave-down working surface matched with the upper salient working surface formed by the tilted surface and the flat and straight sliding surface on the rotary shaft sleeve top end surface. The spacing shaft sleeve is mounted between the spring setting shaft sleeve and the driven shaft sleeve, which inner has the limit guide groove matched with the longitudinal limit lead rail on the spindle.
[0005] Moreover, the length of the shaft sleeve assembled on the spindle depends on the actual thickness of drawers. If the height of spring setting shaft sleeve, rotary shaft sleeve, driven shaft sleeve are basically specified, adjust the length of spacing shaft sleeve to meet with the requirements. The length of spindle equals to the sum of assembled length of all shaft sleeve assemblies and the height of tilted surface on one rotary shaft sleeve.
[0006] The all-drawer locked action actuating mechanism consists of a lock lever, a fixed lock piece and a sliding lock piece. The main body of the fixed lock piece is "L-type" curved shaped, consisting of a horizontal mounting surface with the matched standby mounting hole on the upper top plate and vertical supporting surface with a lock lever working hole, with the included angle 90°. The main body of sliding lock piece is "L-type" curved shaped, consisting of a horizontal sliding working surface with a strip kidney-type assembly hole and one side extended lock head with 180° bend brim and a vertical supporting surface with a vertical strip kidney-type hole, with the included angle 90°. The main body of lock lever is long rod type, consisting of straight rod end and curved shape control actuating end arranged near the tail end.
[0007] Under the assembled conditions, the main bottom plate is fixed on the base plate behind the cabinet body opposite to the top of the drawer, both the upper top plate and the lower bottom plate are respectively arranged on the upper and lower ends of main bottom plate, the "L-type" base plate is welded on the middle bottom plate of the main bottom plate. The main body of shaft pin is welded on the lock-plate; one end is flexibly protruded in the working hole on the right side plate of main bottom plate; the other end is placed in the limit concave hole of left side plate, and assembled and limited by the limit cover plate. One end of the compression spring is inserted on the spring salient seat of "L-type" base plate; the other end is inserted on the spring salient seat at the top bent brim of lock-plate. Through the spindle assembly holes on the upper top plate and lower bottom plate, the spindle with the longitudinal limit lead rail may be assembled between the upper top plate and lower bottom plate, which shall be assembled with several sets of shaft sleeve assemblies formed with spring setting shaft sleeve, rotary shaft sleeve, driven shaft sleeve, and spacing shaft sleeve as necessary. The torsion spring is inserted on the spring setting shaft sleeve, one end is installed on the spring salient seat of spring setting shaft sleeve, the other is installed on the spring mounting hole of limit salient strip on the rotary shaft sleeve. The upper surface of upper top plate is installed with the fixed lock piece, and its lower surface is flexibly installed with the sliding lock piece. The straight rod end of lock lever is connected with the lock core, after passed through the vertical strip kidney-type hole on the sliding lock piece, the control actuating end is protruded into the lock lever working hole on the fixed lock piece.
[0008] When the mutual-constraint safety multi-drawer locking mechanism of this invention is used for the multi-drawer cabinets, all latches on the top of drawers are limited by the lock hook, all located in the locking notch of lock-plate on the shaft sleeve assembly, and kept in locked state, all hump limit clamping strips on the lock-plate may contact with the limit salient strips on the rotary shaft sleeve, all sleeves on the spindle are tightly connected in successive mode, a gap equal to the height of tilted working surface on one rotary shaft sleeve is maintained on the upper part of the spindle. So when pulling one of the drawers and driving the lock-plate to deflect, the lock-plate may push the rotary shaft sleeve to deflect 90°through the hump limit clamping strip on it and the relevant limit salient strip on the rotary shaft sleeve, while driving its tilted surface to make the relative displacement, ensure the sum of its height and that of driven shaft sleeve to add the height of one tilted surface, just then occupy the free sliding gap of all shaft sleeves on the spindle, so, under this condition, other drawers can't be opened, only after this drawer closed and reset, rotate the shaft sleeve, and return under the function of the torsion spring, and the gap on the spindle recovered, another drawer can be opened. When needing to lock all the drawers, the rotation of the lock lever may be controlled through a key to drive the movable lock piece to slide to the spindle and to let the end lock head at the horizontal sliding working surface of movable lock piece protrude into the gap on the upper part of spindle in order to realize the locking of all the drawers.
[0009] Moreover, in theory, with one of the drawers opened, the other drawers can't be opened simultaneously, however, in practice, it is not equivalent that other drawers can't be pulled out. Once an external force pulls out the other drawers, a deflection force may be formed on the relevant lock-plates of other drawers, which may also form a torsion force for the spindle through the limit salient strip on the rotary shaft sleeve. Therefore a curved baffle plate is added on the relevant position of right side plate on the main bottom plate to prevent the deformation and bending of spindle, ensure the high reliability and long service life.
[0010] Based on the design concept mentioned above, this mutual-constraint safety multi-drawer locking mechanism may ensure only the free gap for one drawer's being opened on the spindle under the non-locked state. So under the conditions of one drawer opened, none of the second or more drawers can be opened simultaneously, thus ensuring the operator to open the specified drawer and improve the working efficiency, avoiding confusion of things among drawers, with easier management, and locking all the drawers through a key. So the toolbox or cabinet with this mutual-constraint safety multi-drawer locking mechanism have high convenience and reliability in complex working environment. The mechanism can thoroughly solve the problems of existing technologies of multiple drawers sliding out simultaneously, the cabinet or toolbox collapsing due to the lose of gravity center, the tools spilling on the ground or safety accidents. Thus it has the high practicability and brilliant market foreground.
Brief description of the drawings
[0011]
Fig.1 illustrates the overall structural diagram of this invention embodiment;
Fig.2 illustrates the structural diagram of upper top plate and lower bottom plate in this invention embodiment;
Fig.3 illustrates the structural diagram of shaft pin pinch plate in this invention embodiment;
Fig.4 illustrates the structural diagram of spindle in this invention embodiment;
Fig.5 illustrates the structural diagram of spring setting shaft sleeve in this invention embodiment;
Fig.6 illustrates the structural diagram of rotary shaft sleeve in this invention embodiment;
Fig.7 illustrates the structural diagram of driven shaft sleeve in this invention embodiment;
Fig.8 illustrates drawer locked in this invention embodiment;
Fig.9 illustrates the drawer unlocked in this invention embodiment;
Fig.10 illustrates the structural diagram of movable lock piece in this invention embodiment;
Fig.11 illustrates the diagram of all-drawer locking mechanism installed in this invention embodiment;
[0012] In which:
1. Mounting bracket 2. Driving mechanism 3. Action actuating mechanism
4. Main bottom plate 5. Upper top plate 6. Lower bottom plate 7. Limit cover plate 8. Curved baffle plate 9. Middle bottom plate
10. Left side plate 11. Right side plate 12. Limit concave hole
13. Mounting hole 14. Spindle assembly hole 15.Standby mounting hole
16. Middle mounting surface 17. Assembly hole 18. Left and right mounting supports
19. Working hole 20. Assembly hole 21. "L-type" base plate
22. Lock-plate 23. Shaft pin 24. Compression spring
25. Spring salient seat 26. Assembly hole 27. Assembly hole
28. Left bent side brim 29. Right bent salient seat 30.
Spring salient seat
[0013]
31. Top bent brim 32. Middle supporting plate 33. Locking notch
34. Lock hook 35. Near-lower part position 36. Hump limit clamping strip
37. Limit shoulder 38. Spindle 39.Shaft sleeve assembly
40. Longitudinal limit lead rail 41. Assembly hole 42. Spring setting shaft sleeve
43. Rotary shaft sleeve 44. Driven shaft sleeve 45. Spacing shaft sleeve
46.Torsion spring 47.Limit guide groove 48. Spring salient seat
49. Sector radian 50. Limit guide groove 51. Spring mounting hole
52. Limit salient strip 53. Tilted surface 54. Flat and straight sliding surface
55.Upper salient working surface 56. Concave-down working surface 57.Latch
58. Optional-one drawer open actuating mechanism
59. All-drawer locked actuating mechanism 60. Lock lever
61.Fixed lock piece 62.Sliding lock piece 63. Horizontal mounting surface
64.Lock lever extrusion hole 65. Vertical supporting surface 66. Kidney-type assembly hole
67.Lock head 68. Horizontal sliding working surface 69. Vertical strip kidney-type hole
70. Vertical supporting surface 71. Straight rod end 72. Control actuating end
Detailed description of the embodiment
[0014] The following is the further description of this invention combined with the attached figures and typical embodiment.
[0015] In Fig. 1, Fig. 2 and Fig. 3, the main body of this mutual-constraint safety multi-drawer locking mechanism consists of a mounting bracket 1, a driving mechanism adjustment 2 and an actuating mechanism3. It is characterized in that the mounting bracket 1 consists of the main bottom plate 4, the upper top plate 5, the lower bottom plate 6, the limit cover plate 7and the curved baffle plate 8. The main body of the main bottom plate 4 is strip "the right open box" shaped which shape like the figure of "⊏", and formed by the middle bottom plate 9, left side plate 10 and right side plate 11. The left side plate 10 is arranged with the shaft pin limit holes 12 and the mounting holes 13 of the limit cover plate 7. The right side plate 11 is arranged with the shaft pin working hole which is symmetrical to the limit concave hole 12 on the left side plate 10 and the limit mounting hole of curved baffle plate 8. The shape of upper top plate 5 is symmetrical and matched with that of the main body of lower bottom plate 6, with which the main bottom plate 4 matched "the right open box" shape. Both of the upper and lower plate consists of middle mounting surface 16, on which respectively arranged with spindle assembly hole 14 and standby mounting hole 15, and left and right mounting supports 18 with the assembly hole 17. The limit cover plate 7 is arranged with the working hole 19 and assembly hole 20 corresponding to the shaft pin limit concave hole 12 and limit mounting hole 13 on the left side plate 10. The curved baffle plate 8 is arranged with the assembly hole corresponding to the mounting hole on the right side plate 11. The drive mechanism 2 consists of "L-type" base plate 21, lock-plate 22, shaft pin 23 and compression spring 24. The "L-type" base plate 21 is arranged with the spring salient seat 25 on it. The lock-plate 22 consists of the left and right bent side brim 28 and 29 with the assembly hole 26 and 27, top bent brim 31 with spring salient seat 30 and middle supporting plate 32. The lower brim of left bent side brim 28 has one lock hook 34 with the locking notch 33, the near lower part 35 of right bent side brim 29 is extended with one hump limit clamping strip 36. One end of the shaft pin 23 is arranged with the limit shoulder 37, under assembled mode, the shaft pin 23 is stretched and welded in the assembly holes 26 and 27 on the left and right bent side brim 28 and 29 of lock-plate 22.
[0016] In Fig. 1, Fig. 4, Fig. 5, Fig. 6 and Fig. 7, the action actuating mechanism 3 consists of optional-one drawer open actuating mechanism 58 and all-drawer lock actuating mechanism 59. The optional-one drawer open actuating mechanism 58 is arranged with the spindle 38 and several sets of shaft sleeve assemblies 39 which quantity matched with the drawers. The spindle 38 is arranged with the longitudinal limit lead rail 40, with assembly screw holes 41 at its both ends. The shaft sleeve assembly 39 is formed by the spring setting shaft sleeve 42, rotary shaft sleeve 43, driven shaft sleeve 44, spacing shaft sleeve 45 and torsion spring 46. Inside the spring setting shaft sleeve 42 is arranged with the limit guide groove 47, which is matched with the longitudinal limit lead rail 40 on the spindle 38, and on outside is arranged a spring salient seat 48. Inside the rotary shaft sleeve 43 is arranged with the sector radian 49 limit guide groove 50 which permit the rotary shaft sleeve 43 rotating 90°on the spindle 38, and which depth matched with the longitudinal limit lead rail 40 on the spindle 38, and on outside is arranged a limit salient strip 52 with spring mounting hole 51, and on the top end surface is arranged with the upper salient working surface 55 formed by the tilted surface 53 and flat and straight sliding surface 54. Inside the driven shaft sleeve 44 is arranged the limit guide groove 47 matched with the longitudinal limit lead rail 40 on the spindle 38, and on the lower end face is arranged the concave-down working surface 56 matched with the upper salient working surface 55, which formed by the tilted surface 53 and flat and straight sliding surface 54 on the top end surface of rotary shaft sleeve 43. The spacing shaft sleeve 45 is arranged between the spring setting shaft sleeve 42 and the driven shaft sleeve 44,inside of which is arranged with the limit guide groove 47 matched with the longitudinal limit lead rail 40 on the spindle 38. Moreover, the length of the shaft sleeve assembly 39 mounted on the spindle 38 depends on the actual thickness of drawers. Under the height of spring setting shaft sleeve 42, rotary shaft sleeve 43, driven shaft sleeve 44 are basically specified, adjust the length of spacing shaft sleeve 45 to meet with the requirements. The length of spindle 38 equals to the sum of assembled length of all shaft sleeve assemblies 39 and the height of tilted surface 53 on one rotary shaft sleeve 43.
[0017] In Fig. 1, Fig. 10 and Fig. 11, the all-drawer lock actuating mechanism 59 consists of lock lever 60, fixed lock piece 61 and sliding lock piece 62. The main body of fixed lock piece 61 is "L-type" curved shaped, consisting of horizontal mounting surface 63 with the matched standby mounting hole 15 on the upper top plate 5 and vertical supporting surface 65 with the lock lever working hole 64, with the included angle 90°. The main body of sliding lock piece 62 is "L-type" curved shaped, consisting of horizontal sliding working surface 68 with strip kidney-type assembly hole 66 and one side extended lock head 67 with 180° bend brim and vertical supporting surface 70 with vertical strip kidney-type hole 69, with the included angle 90°. The main body of lock lever 60 is long rod type, consists of straight rod end 71 and curved shape control actuating end 72 arranged near the tail end.
[0018] In Fig. 1, Fig. 8, Fig. 9 and Fig. 11, under the assembled mode, the main bottom plate 4 is fixed on the base plate behind the cabinet body opposite to the top of the drawer, both the upper top plate 5 and lower bottom plate 6 are respectively arranged on the upper and lower ends of main bottom plate 4, the "L-type" base plate 21 is welded on the middle bottom plate 9 of the main bottom plate 4. The main body of shaft pin 23 is welded on the lock-plate 22, one end of it is flexibly protruded in the working hole on the right side plate 11 of main bottom plate 4, the other end is placed in the limit concave hole 12 of left side plate 10 and is assembled and limited by the limit cover plate 7. One end of the compression spring 24 is inserted on the spring salient seat 25 of "L-type" base plate 21, the other end is inserted on the spring salient seat 30 at the top bent brim 31 of lock-plate 22. Through the spindle assembly holes 14 on the upper top plate 5 and lower bottom plate 6, the spindle 38 with the longitudinal limit lead rail 40 may be assembled between the upper top plate 5 and lower bottom plate 6,, on which shall be assembled with several sets of shaft sleeve assemblies 39 formed with spring setting shaft sleeve 42, rotary shaft sleeve 43, driven shaft sleeve 44, and spacing shaft sleeve 45 as necessary. The torsion spring 46 is inserted on the spring setting shaft sleeve 42, one end of it is installed on the spring salient seat 48 which is on the spring setting shaft sleeve 42, the other end is installed on the spring mounting hole 51 of limit salient strip 52 on the rotary shaft sleeve 43. Moreover, the upper surface of upper top plate 5 is installed with the fixed lock piece 61, and its lower surface is flexibly installed with the sliding lock piece 62. The straight rod end 71 of lock lever 60 is connected with the lock core, after passed through the vertical strip kidney-type hole 69 on the sliding lock piece 62, the control actuating end 72 is protruded into the lock lever working hole 64 on the fixed lock piece 61.
[0019] During operating, all latches 57 on the top of the drawers are limited by the lock hook 34, all located in the locking notch 33 of the lock-plate 22 on the shaft sleeve assembly 39, all hump limit clamping strips 36 on the lock-plate 22 may contact with the limit salient strips 52 on the rotary shaft sleeve 43, all sleeves on the spindle 38 are tightly connected in successive mode, a gap equal to the height of tilted working surface 53 on one rotary shaft sleeve 43 is maintained on the upper part of the spindle 38. So when pulling one of the drawers and driving the lock-plate 22 to deflect, the lock-plate 22 may push the rotary shaft sleeve 43 to deflect 90°, through the hump limit clamping strip 36 on it and the relevant limit salient strip 52 on the rotary shaft sleeve 43. While driving its tilted surface 53 to make the relative displacement, the lock-plate 22 can add the height of one tilted surface 53 base on the sum of its height and that of driven shaft sleeve 44, so, it occupy the free sliding gap of all shaft sleeves on the spindle. Under this conditions, other drawers can't be opened, only after this drawer closed and reset, rotate the shaft sleeve, and return under the function of the torsion spring, the lock hook 34 re-protruded into the latch 57 to limit and lock this drawer, and the gap on the spindle recovered, the other drawer may be opened. When needing to lock all the drawers, the rotation of lock lever 60 may be controlled through a key, then drive the movable lock piece 62 to slide to the spindle 38, and then let the end lock head 67 at the horizontal sliding working surface 68 of movable lock piece 62 protrude into the gap on the upper part of spindle 38 to realize the locking of all drawers.
a. the mounting bracket (1) consists of a main bottom plate (4), an upper top plate (5), a lower bottom plate (6), a limit cover plate (7) and a curved baffle plate (8), said main body of the main bottom plate (4) is strip "the right open box" shaped which shape like the figure of "⊏" , formed by a middle bottom plate (9), a left side plate (10) and a right side plate (11), the left side plate (10) is arranged with a shaft pin limit hole (12) and a mounting hole (13) of the limit cover plate (7), the right side plate (11) is arranged with a shaft pin working hole of the left side plate (10) symmetrical to the limit concave hole (12) and a limit mounting hole of the curved baffle plate (8), said shape of the upper top plate (5) is symmetrical and matched with that of the main body of the lower bottom plate (6), "the right open box" shape matched with that of the main bottom plate (4), consists of a middle mounting surface (16) respectively arranged with a spindle assembly hole (14) and a standby mounting hole (15) on it and the left and right mounting supports (18) with an assembly hole (17), said limit cover plate (7) is arranged with a working hole (19) and an assembly hole (20) corresponding to the shaft pin limit concave hole (12) and the limit mounting hole (13) of the left side plate (10), said curved baffle plate (8) is arranged with the assembly hole corresponding to the mounting hole on the right side plate (11);
b. the driving mechanism (2) consists of an "L-type" base plate (21), a lock-plate (22), shaft pin (23) and a compression spring (24), said "L-type" base plate (21) is arranged with a spring salient seat (25) on it, said lock-plate (22) consists of left and right bent side brims (28) and (29) with an assembly hole (26) and (27), top bent brims (31) with a spring salient seat (30) and a middle supporting plate (32), the lower brim of left bent side brim (28) has a lock hook (34) with a locking notch (33), the near lower part (35) of the right bent side brim (29) is extended with a hump limit clamping strip (36), in case of assembled mode, the shaft pin (23) which arranged with a limit shoulder (37) on one end is welded in the assembly holes (26) and (27) on the left and right bent side brim (28) and (29) of the lock-plate (22);
c. the action actuating mechanism (3) consists of an optional-one drawer open actuating mechanism (58) and an all-drawer locked actuating mechanism (59), said optional-one drawer opened actuating mechanism (58) is arranged with a spindle (38) and several sets of shaft sleeve assemblies (39) with the quantity matched with that of drawers, said spindle (38) is arranged with a longitudinal limit lead rail (40), with assembly screw holes (41) at its both ends, said shaft sleeve assembly (39) is formed by a spring setting shaft sleeve (42), a rotary shaft sleeve (43), a driven shaft sleeve (44), a spacing shaft sleeve (45) and a torsion spring (46), inside the said spring setting shaft sleeve (42) is arranged with a limit guide groove (47) which is matched with the longitudinal limit lead rail (40) on the spindle (38), and on outside is arranged a spring salient seat (48), inside the said rotary shaft sleeve (43) is arranged with the sector radian (49) limit guide groove (50) which permit the rotary shaft sleeve (43) rotating 90° on the spindle (38), and which depth matched with the longitudinal limit lead rail (40) on the spindle (38), and on outside is arranged a limit salient strip (52) with spring mounting hole (51), and on the top end surface is arranged with the upper salient working surface (55) formed by the tilted surface (53)and flat and straight sliding surface (54), inside the said driven shaft sleeve (44) is arranged the limit guide groove (47) matched with the longitudinal limit lead rail (40) on the spindle (38), and on the lower end face is arranged a concave-down working surface (56) matched with the upper salient working surface (55), which formed by the tilted surface (53) and flat and straight sliding surface (54) on the top end surface of rotary shaft sleeve (43), inside the said spacing shaft sleeve (45) is arranged with the limit guide groove (47) matched with the longitudinal limit lead rail (40) on the spindle (38), said all-drawer locked actuating mechanism (59) consists of lock lever (60), fixed lock piece (61) and sliding lock piece (62), the main body of fixed lock piece (61) is "L-type" curved shape, consists of horizontal mounting surface (63) with the matched standby mounting hole (15) on the upper top plate (5) and vertical supporting surface (65) with the lock lever working hole (64), with the included angle 90°, said main body of sliding lock piece (62) is "L-type" curved shape, consists of horizontal sliding working surface (68) with strip kidney-type assembly hole (66) and one side extended lock head (67) with 180° bend brim and vertical supporting surface (70) with vertical strip kidney-type hole (69), with the included angle 90°, said main body of lock lever (60) is long rod type, consists of straight rod end (71) and curved shape control actuating end (72) arranged near the tail end.