Simple coded lock

Abstract

The utility model discloses a simple type coded lock which comprises an upper cover, a back plate, a push button, a lock catch assembly, a coded lock assembly and a customs lock assembly, the back plate is installed on the back of the upper cover, the coded lock assembly, the lock catch assembly and the customs lock assembly are sequentially arranged and installed between the back plate and the upper cover, and the push button is arranged on the surface of the upper cover in a horizontally-moving and penetrating mode. The customs lock assembly is installed in the push button, the lock catch assembly comprises a sliding seat, a lock hook, a translation lock block, a first spring and a limiting convex body, the bottom of a rotating lock block of the customs lock assembly is of a D-shaped structure, a lock shaft end plate is arranged at the end, close to the lock catch assembly, of a lock shaft of the coded lock assembly, and the side, close to the lock shaft end plate, of the lock shaft is sleeved with a second spring; and the lock shaft end plate is fixedly clamped in the other side wall of the sliding seat. The lock is simple and compact in structure, reasonable in design, convenient to operate, high in practicability, stable and reliable in operation and low in production cost, and two unlocking modes of the coded lock assembly and the customs lock assembly are arranged.

Description

Technical Field

[0001] The utility model relates to the technical field of luggage locks, and more specifically to a simple password lock. Background Art

[0002] With the development of society, people travel more and more frequently. When people travel, they carry bags to store items. Most bags use zippers as connectors to control opening and closing. In order to prevent the zippers from being opened by others at will, people set bag password locks on the bags. At present, there are bag password locks on the market, such as a zipper password lock disclosed in Chinese patent number CN203420528U, in which each password wheel assembly is arranged in an upright and horizontal parallel arrangement in the lock core accommodating cavity, and the password wheel is sleeved on the inner wheel. An elastic device for pressing and linking the inner wheel with the password wheel is provided at one end of the inner wheel axis, and a code changing mechanism is provided at the other end of the inner wheel axis. The patent technology structure is relatively complex, with many parts, cumbersome assembly, and high production cost. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and to provide a simple password lock with simple and compact structure, small size, convenient operation, stable and reliable operation and low production cost.

[0004] To achieve the above-mentioned purpose, the utility model provides a simple password lock, including an upper cover, a back plate, a push button, a lock catch assembly, a password lock assembly and a customs lock assembly, the back plate is installed on the back of the upper cover, the password lock assembly, the lock catch assembly and the customs lock assembly are all arranged in sequence between the back plate and the upper cover, the push button can be translated through the surface of the upper cover, the customs lock assembly is installed inside the push button, the lock catch assembly includes a sliding seat, a lock hook, a translation lock block, a first spring and a limiting convex body, the sliding seat can be translatedly installed on the back plate, the translation lock block is close to one end of the customs lock assembly is provided with a lock block end plate, the other end of the translation lock block passes through a side wall of the sliding seat and can be translated along the axial direction parallel to the sliding seat, the first spring abuts between the spring limiting column on the inner side of the lock block end plate and the spring limiting part provided on the upper cover and is parallel to the translation lock block, the lock hook is provided with two arranged on the top of one side of the translation lock block away from the lock block end plate, the upper cover is opened The lock member is a bottom portion of a locking member, the bottom portion of the locking member being abutted against the locking member by the locking means and the locking means being able to move in a direction opposite to the locking member when the lock member is unlocked.

[0005] Preferably, the combination lock assembly further comprises at least one combination wheel and at least one bushing, the bushings being respectively located in the center holes of their respective corresponding combination wheels, the combination wheels being sleeved on the lock shaft through the bushings and arranged along the axial direction of the lock shaft, the surface of the upper cover being recessed with a combination wheel hole for the upper end of the combination wheel to pass through, the surface of the lock shaft being provided with at least one first groove, the surface of the lock shaft being recessed with a second groove extending along the axial direction of the lock shaft, the second groove being connected to each first groove, and the inner wall of each bushing being provided with protrusions respectively located in the respective corresponding first grooves.

[0006] Preferably, the outer wall of the sleeve is provided with a plurality of locking blocks distributed along its axial direction, and the inner wall of the cipher wheel is provided with a plurality of annularly distributed locking positions, and the sleeve is inserted into the locking positions through the locking blocks and engaged with the cipher wheel, thereby being connected to the cipher wheel and being able to rotate with the cipher wheel.

[0007] Preferably, the cavity of the upper cover is equipped with a password reset key located at the end of the lock shaft away from the lock shaft end plate, and the password reset key is provided with a accommodating groove on the end face facing the last sleeve, the end of the last sleeve is inserted into the accommodating groove, and the top end of the password reset key passes through the key hole of the upper cover. When the password is correctly unlocked, the password reset key can push the sleeve to move laterally relative to the password wheel, so that the blocking block of the sleeve disengages from the blocking position of the password wheel, and the password wheel can rotate relative to the sleeve to reset the password.

[0008] Preferably, the combination lock assembly also includes at least one positioning spring piece, one end of which is mounted on the back plate, and the other end of which extends toward the direction of the combination wheel and contacts the outer surface of the combination wheel, and a plurality of positioning grooves for the positioning spring piece to be inserted into are recessed between two numbers on the outer surface of the combination wheel.

[0009] Preferably, the customs lock assembly also includes a lock shell and a lock core, the lock shell is fixedly connected to the bottom of the push button, the lock core is installed inside the lock shell, the end of the lock core exposed from the front of the push button can be inserted by the corresponding key, the other end of the lock core is inserted into the top surface of the rotating lock block and can drive the rotating lock block to rotate when unlocking, a limiting notch is provided on one side of the bottom edge of the lock shell, the upper part of the rotating lock block is inserted into the lock shell, and a limiting protrusion is protruded from the upper part of the rotating lock block, which extends out from the limiting notch and can abut against the two side walls of the limiting notch when rotating.

[0010] Preferably, the lock assembly also includes two spring seats, which are respectively arranged in corresponding lock holes, and one end of the translational lock block away from the lock block end plate passes through the central recess of each spring seat, and a third spring is provided between the spring seat and the back plate, and the two side parts of the spring seat are respectively located on both sides of their corresponding lock hooks.

[0011] Preferably, both side edges of the back panel are provided with a plurality of buckles, and both side edges of the upper cover are respectively provided with a snap-in hole corresponding to each buckle, and the back panel is respectively snapped into the respective snap-in holes through the buckles, thereby being installed on the back of the upper cover.

[0012] Preferably, the arc-shaped outer wall on one side of the rotating locking block is in sliding contact with the inner wall of the back plate, and the end surface of the limiting protrusion is arranged in an arc shape.

[0013] Preferably, the upper surface of each locking hook is provided with a guiding arc surface.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model has a simple and compact structure and a reasonable design. It is provided with two unlocking modes, namely, a password lock component and a customs lock component. When the password is correct, the lock shaft can move horizontally, and the lock shaft releases the limit blocking of the sliding seat. Pushing the push button can drive the lock hook to move in the unlocking direction, so that the zipper is separated from the lock hook to unlock. When the password is wrong, the lock shaft can block the sliding seat from moving horizontally in the unlocking direction, so that the lock hook is always inserted horizontally in the lock hole to lock the zipper. When unlocking the customs lock, the lock block is driven to rotate by rotating the lock core, so that a moving space is formed between the rotating lock block and the sliding seat, and then the push button is pushed to drive the sliding seat to move in the unlocking direction to unlock. The utility model has a simple and compact structure, a small volume, convenient operation, strong practicality, stable and reliable operation, and low production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of a simple password lock provided by the embodiment of the utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the internal structure of a simple password lock provided by the embodiment of the utility model. Figure 1 ;

[0019] Figure 3 This is a schematic diagram of the internal structure of a simple password lock provided by the embodiment of the utility model. Figure 2 (sliding seat hidden);

[0020] Figure 4 It is a top view schematic diagram of the internal structure of a simple password lock provided by an embodiment of the utility model;

[0021] Figure 5 It is an exploded schematic diagram of a simple password lock provided by an embodiment of the utility model;

[0022] Figure 6 It is an exploded schematic diagram of a lock assembly of a simple password lock provided by an embodiment of the utility model;

[0023] Figure 7 It is an exploded schematic diagram of a customs lock assembly of a simple password lock provided by an embodiment of the utility model;

[0024] Figure 8It is a partial exploded schematic diagram of a combination lock assembly of a simple combination lock provided by an embodiment of the utility model;

[0025] Fig. 9 It is a partial enlarged view of a simple password lock provided by the utility model when unlocking (lock hook withdrawn). DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Please refer to Figure 1 and Figure 5 The embodiment of the utility model provides a simple password lock, including an upper cover 2, a back plate 3, a push button 4, a lock assembly 5, a password lock assembly 6 and a customs lock assembly 7. The various components of this embodiment are described in detail below in conjunction with the accompanying drawings.

[0028] like Figure 1 and Figure 2 As shown, the back plate 3 can be installed on the back of the upper cover 2, the password lock assembly 6, the lock assembly 5 and the customs lock assembly 7 are arranged in sequence between the back plate 3 and the upper cover 2, the push button 4 can be translated through the surface of the upper cover 2, and the customs lock assembly 7 is installed inside the push button 4. Among them, this embodiment can also include a bottom box 1, and the upper cover 2 is preferably installed in the cavity of the bottom box 1.

[0029] Specifically, both side edges of the back panel 3 may be provided with a plurality of clips 31, and both side edges of the upper cover 2 are respectively provided with a snap-in hole 25 corresponding to each clip 31, and the back panel 3 is respectively inserted into the respective snap-in holes 25 through the clips 31, thereby being installed on the back of the upper cover 2.

[0030] like Figure 2 , Figure 3 and Figure 6As shown, the lock assembly 5 may include a sliding seat 51, a locking hook 52, a translational locking block 53, a first spring 54 and a limiting protrusion 55. The sliding seat 51 can be translationally installed on the back plate 3. A locking block end plate 531 is provided at one end of the translational locking block 53 close to the customs lock assembly 7. The other end of the translational locking block 53 passes through a side wall of the sliding seat 51 and can be translated along an axial direction parallel to the sliding seat 51. The first spring 54 abuts between the spring limiting column 532 on the inner side of the locking block end plate 531 and the spring limiting portion 21 provided on the upper cover 2 and is parallel to the translational locking block 53. The locking hook 52 is provided with two top portions on one side of the translational locking block 53 away from the locking block end plate 531. Two locking holes 22 corresponding to the locking hook 52 are provided on the upper cover 2. The limiting protrusion 55 is fixedly installed on the bottom of the sliding seat 51 on the side close to the customs lock assembly 7.

[0031] Preferably, the upper surface of each locking hook 52 may be provided with a guiding arc surface 521. The setting of the guiding arc surface 521 can play a guiding role when the zipper is inserted.

[0032] In this embodiment, the lock assembly 5 also includes two spring seats 56, and the two spring seats 56 are respectively arranged in the corresponding lock holes 22. The end of the translation lock block 53 away from the lock block end plate 531 passes through the central recess of each spring seat 56. A third spring 57 is provided between the spring seat 56 and the back plate 3, and the two side parts of the spring seat 56 are respectively located on the two sides of their corresponding lock hooks 52.

[0033] When the user unlocks the door, the two lock hooks 52 withdraw from the lock hole 22 and separate from the zipper, and the third spring 53 drives the spring seat 56 to rise, so that the spring seat 56 pushes the zipper out, and the unlocked zipper automatically pops out, without the user manually pulling out the zipper pull tab, which greatly improves the user experience.

[0034] like Figure 5 and Figure 7 As shown, the customs lock assembly 7 may include a rotating lock block 71, a lock shell 72 and a lock core 73. The bottom of the rotating lock block 71 can be arranged in a D-shaped structure. The lock shell 72 is fixedly connected to the bottom of the push button 4, and the lock core 73 is installed inside the lock shell 72. The end of the lock core 73 exposed from the front of the push button 4 can be inserted by the corresponding key, and the other end of the lock core 73 is inserted into the top surface of the rotating lock block 71 and can drive the rotating lock block 71 to rotate when unlocking. A limiting notch 721 is provided on one side of the bottom edge of the lock shell 72, and the upper part of the rotating lock block 71 is inserted into the lock shell 72. A limiting protrusion 711 is convexly provided on the upper part of the rotating lock block 71. The limiting protrusion 711 extends out from the limiting notch 721 and can abut against the two side walls of the limiting notch 721 when rotating.

[0035] In order to make the opening and closing of the customs lock smoother, the arc-shaped outer wall of one side of the rotating lock block 71 can slide in contact with the inner wall of the back plate 3, and the end surface of the limiting protrusion 55 is arranged in an arc shape.

[0036] In specific implementation, when the customs lock assembly 7 is locked, the limiting convex body 55 abuts against the arc-shaped outer wall of the rotating lock block 71, thereby limiting the movement of the push button 4 in the unlocking direction. When the customs lock assembly 7 is unlocked, the rotating lock block 71 rotates to form a moving space between it and the limiting convex body 55, and then the push button 4 is pushed to drive the translation lock block 53 to move in the unlocking direction to achieve unlocking. At this time, regardless of whether the password is correct, the user can unlock by pushing the push button 4.

[0037] like Figure 5 and Figure 8 As shown, the combination lock assembly 6 may include a lock shaft 61, a second spring 62, three code wheels 63 and three sleeves 64, etc., a lock shaft end plate 611 may be provided at one end of the lock shaft 61 close to the lock assembly 5, a second spring 62 is sleeved on one side of the lock shaft 61 close to the lock shaft end plate 611, the lock shaft end plate 611 is fixedly clamped in the other side wall of the sliding seat 51, the sleeves 64 are respectively located in the center holes of their respective corresponding code wheels 63, the code wheels 63 are sleeved on the lock shaft 61 through the sleeves 64 and are arranged along the axial direction of the lock shaft 61, a code wheel hole 23 for the upper end of the code wheel 63 to pass through is recessed on the surface of the upper cover 2, at least one first groove 612 is opened on the surface of the lock shaft 61, a second groove 613 extending along the axial direction of the lock shaft 61 is recessed on the surface of the lock shaft 61, the second groove 613 is connected to each first groove 612, and a protrusion 641 is provided on the inner wall of each sleeve 64, which is respectively located in the corresponding first groove 612.

[0038] Specifically, the outer wall of the sleeve 64 may be provided with a plurality of latching blocks 642 distributed along its axial direction, and the inner wall of the code wheel 63 may be provided with a plurality of annularly distributed latching positions 631. The sleeve 64 is inserted into the latching positions 631 through the latching blocks 642 and is latched with the code wheel 63, thereby being connected to the code wheel 63 and being able to rotate with the code wheel 63.

[0039] In a specific implementation, when the locking block 642 of the shaft sleeve 64 is locked in the locking position 631 of the code wheel 63, the shaft sleeve 64 will be driven to rotate together when the code wheel 63 is rotated.

[0040] Among them, in other embodiments, the number of the code wheel and the related components used therewith can be changed according to the actual needs of the user, which is not limited to this embodiment.

[0041] Preferably, the cavity of the upper cover 2 can be equipped with a password reset key 65 located at the end of the lock shaft 61 away from the lock shaft end plate 611, and a receiving groove 66 is provided on the end surface of the password reset key 65 facing the last sleeve 64, and the end of the last sleeve 64 is inserted into the receiving groove 66, and the top end of the password reset key 65 passes through the key hole 24 of the upper cover 2. When the password is correct and the unlocking state is in progress, the password reset key 65 can push the sleeve 64 to move laterally relative to the password wheel 63, so that the blocking block 642 of the sleeve 64 disengages from the blocking block 631 of the password wheel 63, so that the password wheel 63 can rotate relative to the sleeve 64 to reset the password.

[0042] Furthermore, a support block 21 is provided on the bottom mounting plate 2 and is located below each shaft sleeve 7 , and a code wheel accommodating space is provided between two adjacent support blocks 21 .

[0043] Preferably, the combination lock assembly 6 further includes at least one positioning spring piece 67, one end of which is mounted on the back plate 3, and the other end of which extends toward the direction of the combination wheel 63 and contacts the outer surface of the combination wheel 63. A plurality of positioning grooves 632 for the positioning spring piece 67 to be inserted into are concavely arranged between two numbers on the outer surface of the combination wheel 63. The positioning groove 632 is for preventing the combination wheel 63 from rotating unnecessarily. By inserting the end of the positioning piece 67 into the positioning groove 632, the combination wheel 63 can be positioned to prevent the combination wheel 63 from rotating unnecessarily.

[0044] In specific implementation, when the password is incorrect and the locked state is in progress, the protrusion 641 of the sleeve 64 is offset from the second groove 613 of the lock shaft 61. At this time, the protrusion 641 of the sleeve 64 will block the lock shaft 61, and the lock shaft 61 blocks the sliding seat 51 from moving laterally in the unlocking direction, so that the push button 4 and the customs lock assembly 7 cannot drive the lock shaft 61 and the translation lock block 53 to move in the unlocking direction close to the password reset key 65, and the lock hook 52 cannot withdraw from the lock hole 22.

[0045] like Fig. 9 As shown, when the password is correct and the unlocked state is in progress, each protrusion 641 of the sleeve 64 is aligned with the second groove 613 of the lock shaft 61, and the protrusion 641 releases the limit blockage on the sleeve 64, so that each protrusion 641 of the sleeve 64 is placed in the second groove 613 of the lock shaft 61, and the lock shaft 61 releases the limit blockage on the sliding seat 51. At this time, the user can push the push button 4 so that the lower end of the push button 4 pushes the translation lock block 53 to move in the unlocking direction, and the two lock hooks 52 will follow the translation lock block 53 to move, thereby withdrawing from the lock hole 22. At this time, the spring seat 56 will automatically push the zipper out to unlock it.

[0046] In summary, the utility model has a simple and compact structure, a small volume, is easy to operate, has strong practicality, runs stably and reliably, and has a low production cost.

[0047] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A simple password lock, characterized by: The invention comprises an upper cover (2), a back plate (3), a push button (4), a lock assembly (5), a password lock assembly (6) and a customs lock assembly (7), wherein the back plate (3) is mounted on the back of the upper cover (2), the password lock assembly (6), the lock assembly (5) and the customs lock assembly (7) are sequentially arranged and mounted between the back plate (3) and the upper cover (2), the push button (4) is arranged on the surface of the upper cover (2) in a translational manner, the customs lock assembly (7) is mounted inside the push button (4), the lock assembly (5) comprises a sliding seat (51), a lock hook (52), a translation lock block (53), a first spring (54) and a limiting convex body (55), the sliding seat (5 1) is installed on the back plate (3) in a translational manner, the translational lock block (53) is provided with a lock block end plate (531) at one end close to the customs lock assembly (7), the other end of the translational lock block (53) passes through a side wall of the sliding seat (51) and can be translated along the axial direction parallel to the sliding seat (51), the first spring (54) is abutted between the spring limiting column (532) on the inner side of the lock block end plate (531) and the spring limiting portion (21) provided on the upper cover (2) and is parallel to the translational lock block (53), the lock hook (52) is provided with two sets of the top of the side of the translational lock block (53) away from the lock block end plate (531), the upper cover (2) Two locking holes (22) corresponding to the locking hooks (52) are provided on the sliding seat (51); the limiting convex body (55) is fixedly mounted on the bottom of the sliding seat (51) on the side close to the customs lock assembly (7); the bottom of the rotating lock block (71) of the customs lock assembly (7) is arranged in a D-shaped structure; when the customs lock assembly (7) is locked, the limiting convex body (55) abuts against the arc-shaped outer wall of the rotating lock block (71), thereby limiting the movement of the push button (4) in the unlocking direction; when the customs lock assembly (7) is unlocked, the rotating lock block (71) rotates to form a moving space between it and the limiting convex body (55), and then pushes the push button (4) and drives the translation lock block (53) to move in the unlocking direction. The lock shaft (61) of the combination lock assembly (6) is provided with a lock shaft end plate (611) at one end close to the lock assembly (5), and a second spring (62) is sleeved on one side of the lock shaft (61) close to the lock shaft end plate (611). The lock shaft end plate (611) is fixedly connected to the other side wall of the sliding seat (51). When the password is incorrect and the lock is in a locked state, the lock shaft (61) blocks the sliding seat (51) from moving horizontally in the unlocking direction. When the password is correct and the lock is in an unlocking state, the lock shaft (61) releases the limit block on the sliding seat (51), so that the push button (4) can drive the translation lock block (53) to move in the unlocking direction to achieve unlocking.

2. A simple combination lock according to claim 1, characterized in that: The combination lock assembly (6) further comprises at least one combination wheel (63) and at least one shaft sleeve (64), wherein the shaft sleeves (64) are respectively located in the center holes of the corresponding combination wheels (63), the combination wheels (63) are sleeved on the lock shaft (61) through the shaft sleeves (64) and are arranged along the axial direction of the lock shaft (61), the surface of the upper cover (2) is recessed with a combination wheel hole (23) for the upper end of the combination wheel (63) to pass through, the surface of the lock shaft (61) is provided with at least one first groove (612), the surface of the lock shaft (61) is recessed with a second groove (613) extending along the axial direction of the lock shaft (61), the second groove (613) is connected to each first groove (612), and the inner wall of each shaft sleeve (64) is provided with a protrusion (641) respectively located in the corresponding first groove (612).

3. A simple combination lock according to claim 2, characterized in that: The outer wall of the shaft sleeve (64) is provided with a plurality of latching blocks (642) distributed along its axial direction, and the inner wall of the code wheel (63) is provided with a plurality of annularly distributed latching positions (631). The shaft sleeve (64) is inserted into the latching positions (631) through the latching blocks (642) and is latched with the code wheel (63), thereby being connected with the code wheel (63) and being able to rotate with the code wheel (63).

4. A simple combination lock according to claim 3, characterized in that: The cavity of the upper cover (2) is provided with a password reset key (65) located at one end of the lock shaft (61) away from the lock shaft end plate (611); a receiving groove (66) is provided on the end surface of the password reset key (65) facing the last shaft sleeve (64); the end of the last shaft sleeve (64) is inserted into the receiving groove (66); the top end of the password reset key (65) passes through the key hole (24) of the upper cover (2); when the password is correct and the unlocking state is in progress, the password reset key (65) can push the shaft sleeve (64) to move laterally relative to the password wheel (63), so that the blocking block (642) of the shaft sleeve (64) is disengaged from the blocking block (631) of the password wheel (63), so that the password wheel (63) can rotate relative to the shaft sleeve (64) to reset the password.

5. A simple combination lock according to claim 2, characterized in that: The combination lock assembly (6) further comprises at least one positioning spring piece (67), one end of which is mounted on the back plate (3), the other end of which extends in the direction of the combination wheel (63) and contacts the outer surface of the combination wheel (63), and a plurality of positioning grooves (632) for the positioning spring piece (67) to be inserted into are concavely arranged between two numbers on the outer surface of the combination wheel (63).

6. A simple combination lock according to claim 1, characterized in that: The customs lock assembly (7) further comprises a lock shell (72) and a lock core (73); the lock shell (72) is fixedly connected to the bottom of the push button (4); the lock core (73) is installed inside the lock shell (72); one end of the lock core (73) exposed from the front of the push button (4) can be inserted with a corresponding key; the other end of the lock core (73) is inserted into the top surface of the rotating lock block (71) and can drive the rotating lock block (71) to rotate when unlocking; a limiting notch (721) is provided on one side of the bottom edge of the lock shell (72); the upper part of the rotating lock block (71) is inserted into the lock shell (72); a limiting protrusion (711) is convexly provided on the upper part of the rotating lock block (71); the limiting protrusion (711) extends from the limiting notch (721) and can abut against two side walls of the limiting notch (721) when rotating.

7. A simple combination lock according to claim 1, characterized in that: The lock assembly (5) further comprises two spring seats (56), the two spring seats (56) being respectively arranged in corresponding lock holes (22), one end of the translation lock block (53) away from the lock block end plate (531) passing through a middle recess of each spring seat (56), a third spring (57) being arranged between the spring seat (56) and the back plate (3), and two side portions of the spring seat (56) being respectively located on two sides of the corresponding lock hooks (52).

8. A simple combination lock according to claim 1, characterized in that: A plurality of buckles (31) are provided on both sides of the back plate (3), and a buckle hole (25) corresponding to each buckle (31) is respectively opened on both sides of the upper cover (2), and the back plate (3) is respectively inserted into the respective buckle holes (25) through the buckles (31), thereby being installed on the back of the upper cover (2).

9. A simple combination lock according to claim 1, characterized in that: The arc-shaped outer wall of one side of the rotating lock block (71) is in sliding contact with the inner wall of the back plate (3), and the end surface of the limiting protrusion (55) is arranged in an arc shape.

10. A simple combination lock according to claim 1, characterized in that: The upper surface of each locking hook (52) is provided with a guiding arc surface (521).

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