A combination lock

Abstract

The utility model belongs to the technical field of lockset, specifically disclose a kind of combination lock, including a kind of combination lock, including fixed seat, fixed seat is equipped with connecting rope, and the one end of connecting rope away from fixed seat is equipped with buckle head;Lock shell, lock shell is equipped with the accommodating cavity of opening, and the password mechanism is equipped in accommodating cavity;Pressing mechanism, including button and first spring, and the button is equipped with clamping hole, and the one end of button passes through the lateral wall of lock shell, and the other end of button is abutted on first spring, and the one end of first spring away from button is abutted on the inner wall of accommodating cavity;Password mechanism can be extruded by button, to make buckle head can pass through the through-hole of lock shell lateral wall, clamping hole on button in turn, and make buckle head and button mutually lock or mutually separate. Since the one end of button passes through the lateral wall of lock shell, button can be directly pressed, and password mechanism can be extruded only by button and first spring, so that only a few parts are needed, so that the cost of raw materials can be saved, and assembly is also facilitated.

Description

Technical Field

[0001] This utility model relates to the field of lock technology, and in particular to a combination lock. Background Technology

[0002] A combination lock is a type of lock that uses a series of numbers or symbols to open or lock.

[0003] For example, Chinese utility model patent with publication number CN213510010U discloses a convenient combination lock. According to its disclosure, its working principle is as follows: by installing the fixed base on the door or window and installing the lock shell on the door or window frame, the door or window can be opened and closed by tightening and loosening the lock rope. When unlocking, first rotate the combination toggle mechanism and input the set password. At this time, the elastic column is in a free state. By pressing the button, the rotating part rotates around the rotating column. At the same time, the rotating part exerts pressure on the elastic column through the compression block. At this time, the elastic column is compressed and contracted. At the same time, the lever of the rotating part rotates in the lock notch and toggle the lock. The movement of the lock compresses the spring. At this time, the end of the lock rope moves to the end of the lock notch (see paragraph

[0021] of the patent specification).

[0004] However, in actual use, the button needs to be pressed, the rotating part rotates around the rotating column, the rotating part squeezes the stop block to exert pressure on the elastic column, and at the same time the lever of the rotating part rotates in the locking notch to move the locking part. It can be seen that this structure not only requires more parts, making production and assembly troublesome, but also has higher raw material costs. At the same time, because the rotating part rotates around the rotating column, the spring's reaction force on the locking part is completely reflected by the rotating part to the button (lever principle). In addition, the reaction force of the elastic column on the rotating part and the button makes it difficult to press the button, which requires a relatively large pressing force. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a combination lock.

[0006] The technical solution adopted by this utility model to solve its technical problem is: a combination lock, comprising...

[0007] A fixing base, wherein a connecting rope is provided on the fixing base, and a buckle is provided at the end of the connecting rope away from the fixing base;

[0008] A lock case, wherein the lock case has an open receiving cavity, and a combination mechanism is provided inside the receiving cavity;

[0009] The pressing mechanism includes a button and a first spring. The button has a locking hole. One end of the button passes through the side wall of the lock case, and the other end of the button abuts against the first spring. The end of the first spring away from the button abuts against the inner wall of the receiving cavity.

[0010] The combination mechanism can be pressed by the button so that the buckle can pass through the through hole on the side wall of the lock case and the locking hole on the button in sequence, and the buckle and the button can be locked or disengaged from each other.

[0011] As a further embodiment, the button includes an integrally formed sliding part and a pressing part. A first placement groove is provided in the receiving cavity. The sliding part and the first spring are placed in the first placement groove. One end of the sliding part passes through the side wall of the lock shell. The pressing part is provided at the other end of the sliding part and is located outside the first placement groove. The through hole is located on one side of the first placement groove. The locking hole is provided on the sliding part, and the password mechanism can be pressed through the pressing part.

[0012] As a further embodiment, the locking hole is a gourd-shaped hole with a large hole and a small hole communicating with each other. The small hole is close to the first spring, and the large hole is far away from the first spring. The buckle is provided with a locking part.

[0013] As a further embodiment, a groove is provided between the sliding part and the pressing part to cooperate with the side wall of the first placement groove.

[0014] As a further option, a protective cap is fitted onto one end of the sliding part that passes through the side wall of the lock housing.

[0015] As a further embodiment, the sliding part has a protrusion at one end near the pressing part, and one end of the first spring is sleeved on the protrusion.

[0016] As a further embodiment, the combination lock also includes an ejection mechanism. The receiving cavity is provided with a second placement slot for placing the ejection mechanism. The second placement slot communicates with the first placement slot and corresponds to the through hole. The ejection mechanism includes an ejector and a second spring. The ejector is a cylindrical structure. One end of the second spring is placed inside the ejector, and the other end of the second spring abuts against the inner wall of the second placement slot. The pressing part can abut against the outer wall of the second placement slot. The combination mechanism can be pressed by the pressing part so that the buckle can pass through the through hole and the locking hole in sequence on the side wall of the lock case and abut against the ejector.

[0017] As a further embodiment, the cryptographic mechanism includes a push rod, a third spring, several bushings, and a number of cryptographic wheels matching the number of bushings. The push rod is movably mounted within the receiving cavity, and one end of the push rod has a protrusion. The third spring and several bushings are sequentially sleeved on the push rod, with the third spring close to the protrusion. The cryptographic wheels are sleeved on the bushings, and the cryptographic wheels and bushings are toothed to each other. The push rod has key blocks spaced along the axial direction in a number matching the number of bushings. The inner wall of the bushing has a through groove through which the key blocks can pass, so that the pressing part can press the protrusion.

[0018] The centerline of the third spring is perpendicular to the centerline of the first spring, and the side of the sliding part abuts against the inner wall of the receiving cavity where the through hole is located.

[0019] As a further solution, a back cover is provided at the opening position, and a limiting plate, a first positioning plate, a second positioning plate and a third positioning plate are respectively provided on the back cover.

[0020] This utility model has one of the following beneficial effects:

[0021] 1. Since one end of the button passes through the side wall of the lock case, the button can be pressed directly, and only the button and the first spring are needed to compress the password mechanism. Therefore, fewer parts are required, which can save the cost of raw materials and facilitate assembly.

[0022] 2. The centerline of the third spring is perpendicular to the centerline of the first spring. Since the side of the sliding part abuts against the inner wall of the receiving cavity where the through hole is located, the force of the third spring on the protrusion is further applied to the inner wall of the receiving cavity where the through hole is located through the squeezing part and the sliding part. In other words, most of the force of the third spring on the protrusion is distributed on the inner wall of the receiving cavity, reducing the force on the button, thus making it easier to press the button. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model (I);

[0024] Figure 2 This is a three-dimensional structural diagram (I) of an embodiment of the present utility model (with the fixing base and connecting rope removed);

[0025] Figure 3 This is a three-dimensional structural diagram (II) of an embodiment of the present utility model (with the fixing base and connecting rope removed);

[0026] Figure 4 This is a three-dimensional structural diagram (three) of an embodiment of the present utility model (with the fixing base and connecting rope removed);

[0027] Figure 5This is a three-dimensional structural diagram (fourth) of an embodiment of the present utility model (with the fixing base and connecting rope removed, and the back cover opened);

[0028] Figure 6 This is a three-dimensional exploded view (first) of an embodiment of the present utility model;

[0029] Figure 7 This is a three-dimensional exploded view (II) of an embodiment of the present utility model;

[0030] Figure 8 This is an exploded view of the cryptographic mechanism in an embodiment of this utility model;

[0031] Figure 9 This is a perspective view of the bushing in an embodiment of the present utility model;

[0032] Figure 10 This is a schematic diagram of the button structure in an embodiment of the present utility model;

[0033] Figure 11 This is a schematic diagram of the button structure in an embodiment of the present utility model;

[0034] Figure 12 This is a schematic diagram (one) illustrating the application of an embodiment of the present utility model.

[0035] Figure 13 This is a schematic diagram (II) illustrating the application of an embodiment of this utility model.

[0036] In the diagram, 1-fixed base, 11-connecting rope, 12-buckle, 121-locking part, 2-lock case, 21-accommodating cavity, 211-first placement groove, 212-second placement groove, 213-through hole, 214-perforation, 3-rear cover, 31-limiting plate, 32-first positioning plate, 33-second positioning plate, 34-third positioning plate, 4-pressing mechanism, 41-button, 411-locking hole, 4111-large hole, 4112-small hole, 412-sliding groove, 413-protrusion, 414-sliding part, 415-pressing part, 41 51-Arc surface, 42-Protective cap, 43-First spring, 5-Mounting base, 51-Receiving groove, 52-Limiting protrusion, 53-Observation window, 54-Mounting hole, 55-Card slot A, 56-Card slot B, 57-Insertion hole, 6-Password mechanism, 61-Push rod, 611-Key block, 62-Third spring, 63-Hole sleeve, 631-Limiting protrusion ring, 632-Marking part, 633-Through groove, 64-Password wheel, 65-Protrusion, 66-Washer, 67-Code changing part, 7-Ejection mechanism, 71-Ejection part, 72-Second spring. Detailed Implementation

[0037] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0038] It should be noted that the combination lock of this utility model can be applied between two parts that need to be opened and closed, such as windows, drawers, toilets, washing machines, refrigerators, etc. For example, the fixing base 1 can be fixed to the window sash with screws or double-sided tape, and the lock shell 2 can be fixed to the window frame with screws or double-sided tape; conversely, the fixing base 1 can also be fixed to the window frame with screws or double-sided tape, and the lock shell 2 can be fixed to the window sash with screws or double-sided tape.

[0039] As attached Figure 1-5 As shown, the present invention provides a combination lock, including...

[0040] A fixing base 1 is provided, on which a connecting rope 11 is installed. A buckle 12 is provided at one end of the connecting rope 11 away from the fixing base 1. Specifically, a locking block can be provided at the other end of the connecting rope 11, thereby confining the other end of the connecting rope 11 within the fixing base 1. By opening the rear cover of the fixing base 1, the other end of the connecting rope 11 can be easily passed through the outer shell of the fixing base 1 and then connected to the locking block, so that the other end of the connecting rope 11 is installed in the inner cavity of the fixing base 1.

[0041] Specifically, the connecting rope 11 can be made of a rope that is not easily broken, such as a steel rope. Its function is to connect the fixing seat 1 and the lock housing 2, thereby allowing the two parts to be separated or not separated. At the same time, the connecting rope 11 can also allow the two parts to open to a certain degree, such as between the window sash and the window frame, which is conducive to ventilation without being fully opened or closed.

[0042] The lock housing 2 has an integrally formed receiving cavity 21 with an opening. The receiving cavity 21 is equipped with a combination mechanism 6, and a back cover 3 is provided at the opening. Specifically, a threaded post can be integrally formed in the receiving cavity 21. By connecting the back cover 3 to the threaded post with a screw, the back cover 3 can be fixed at the opening of the receiving cavity 21.

[0043] The pressing mechanism 4 includes a button 41 and a first spring 43. The button 41 has a locking hole 411. One end of the button 41 passes through the side wall of the lock housing 2, and the other end of the button 41 abuts against the first spring 43. The end of the first spring 43 away from the button 41 abuts against the inner wall of the receiving cavity 21. The combination mechanism 6 can be pressed by the button 41 so that the buckle 12 can pass through the through hole 213 in the side wall of the lock housing 2 and the locking hole 411 on the button 41 in sequence, and the buckle 12 and the button 41 can be locked or disengaged from each other.

[0044] Specifically, when the combination mechanism 6 is set to the correct combination, the button 41 can press the combination mechanism 6, thereby pressing one end of the button 41 that passes through the side wall of the lock case 2. This allows the buckle 12 to pass through the through hole 213 on the side wall of the lock case 2 and the locking hole 411 on the button 41 in sequence. Under the force of the first spring 43, the button 41 is reset. Then, the combination of the combination mechanism 6 is scrambled, so that the button 41 can no longer press the combination mechanism 6. This locks the buckle 12 and the button 41 together, and the combination lock is locked. When the combination mechanism 6 is set to the correct combination again, the button 41 can press the combination mechanism 6, thereby pressing one end of the button 41 that passes through the side wall of the lock case 2. This disengages the buckle 12 and the button 41. The buckle 12 can then exit through the locking hole 411 on the button 41 and the through hole 213 on the side wall of the lock case 2, and the combination lock is unlocked.

[0045] In this invention, since one end of the button 41 passes through the side wall of the lock shell 2, the button 41 can be pressed directly. Only the button 41 and the first spring 43 are needed to compress the password mechanism 6. Therefore, fewer parts are needed and no extra parts such as the rotating column, rotating parts, and levers in the prior art are required. This saves the cost of raw materials and facilitates assembly.

[0046] As a further detailed description, see attached Figure 6 , 10 As shown in Figure -11, button 41 includes an integrally formed sliding part 414 and a pressing part 415. A first placement groove 211 is provided within the receiving cavity 21. The sliding part 414 and the first spring 43 are placed within the first placement groove 211, serving to accommodate, guide, and limit the sliding part 414 and the first spring 43, preventing their displacement and making it easier to press button 41. One end of the sliding part 414 passes through the side wall of the lock housing 2. The pressing part 415 is located at the other end of the sliding part 414 and is positioned outside the first placement groove 211, allowing the pressing part 415 to be closer to and press against the keypad mechanism 6. A through hole 213 is located on one side of the first placement groove 211, and a locking hole 411 is provided on the sliding part 414, facilitating the sequential passing of the buckle 12 through the through hole 213 and the locking hole 411.

[0047] For details, see attached. Figure 1 , 6 As shown in Figures 10-11, the aforementioned locking hole 411 is a gourd-shaped hole in which the large hole 4111 and the small hole 4112 communicate. The small hole 4112 is close to the first spring 43, and the large hole 4111 is far away from the first spring 43. The buckle 12 is provided with a locking part 121, which can be a limiting flange at the end of the buckle 12 or an annular groove on the side of the buckle 12.

[0048] When the locking part 121 is a limiting flange, in terms of diameter, the buckle 12 < small hole 4112 < limiting flange < large hole 4111. In this way, after the buckle 12 is inserted into the large hole 4111, the buckle 12 is further moved to the small hole 4112. The limiting flange is outside the small hole 4112, thereby locking and locking the buckle 12.

[0049] When the locking part 121 is an annular locking groove, as shown in the attached... Figure 1 As shown, in terms of diameter, the small hole 4112 < the buckle head 12 < the large hole 4111. Thus, after the buckle head 12 is inserted into the large hole 4111, the small hole 4112 is further engaged in the annular groove, thereby locking and positioning the buckle head 12. This embodiment is preferred.

[0050] When locking, press button 41 first to align the large hole 4111 of the locking hole 411 with the through hole 213. Insert buckle 12 into the through hole 213 and the large hole 4111 in sequence. Then release button 41. Under the force of the first spring 43, button 41 returns to its original position, so that the small hole 4112 of the locking hole 411 is locked in the locking part 121, and buckle 12 cannot be released. Alternatively, when unlocking, press button 41 first to align the large hole 4111 of the locking hole 411 with the through hole 213. The small hole 4112 of the locking hole 411 disengages from the locking part 121, and buckle 12 is removed from the locking hole 411 and the through hole 213 in sequence.

[0051] As an improvement to the above scheme, see the attached document. Figure 10 As shown, a sliding groove 412 is provided between the sliding part 414 and the pressing part 415 to cooperate with the side wall of the first placement groove 211, which serves to limit and guide the button 41, making it easier and less effort to press the button 41, and preventing the button 41 from loosening or shifting.

[0052] In some embodiments, as shown in the appendix Figure 2 As shown, a protective cap 42 is fitted onto one end of the sliding part 414 that passes through the side wall of the lock housing 2. The protective cap 42 can increase the pressing area, reduce finger pain caused by the small force area, and make it easier to press the button 41.

[0053] Further details are attached. Figure 10 As shown, the sliding part 414 has a protrusion 413 at one end near the pressing part 415. One end of the first spring 43 is sleeved on the protrusion 413, which serves to fix the first spring 43 and prevent the first spring 43 from being loosened by force when pressed.

[0054] Additionally, in some embodiments, as shown in the appendix Figure 5-6As shown, the combination lock also includes an ejection mechanism 7. The receiving cavity 21 is provided with a second placement groove 212 for placing the ejection mechanism 7. The second placement groove 212 communicates with the first placement groove 211 and is located on one side of the first placement groove 211. The second placement groove 212 corresponds to the through hole 213 (the center line of the second placement groove 212 and the center point of the through hole 213 are on the same straight line). The ejection mechanism 7 includes an ejector 71 and a second spring 72. The ejector 71 has a cylindrical structure. One end of the second spring 72 is placed inside the ejector 71, and the other end of the second spring 72 abuts against the inner wall of the second placement groove 212. Thus, when unlocking, the buckle 12 can be automatically ejected from the locking hole 411 and the through hole 213 through the ejector 71. Meanwhile, as an improvement, a first limiting protrusion (not shown in the figure) is integrally formed on the side wall of the ejector 71, and a second limiting protrusion (not shown in the figure) is integrally formed at the point where the second placement groove 212 communicates with the first placement groove 211. The first limiting protrusion can abut against the second limiting protrusion, thereby limiting the movement stroke of the ejector 71 and preventing the ejector 71 from disengaging from the second placement groove 212.

[0055] As attached Figure 7 As shown, a limiting plate 31, a first positioning plate 32, and a second positioning plate 33 are respectively provided on the rear cover 3. After the rear cover 3 is connected to the threaded post by screws passing through it, the rear cover 3 can be fixed at the opening of the receiving cavity 21. At this time, the limiting plate 31 and the first positioning plate 32 are in sequence close to the pressing mechanism 4 and the ejection mechanism 7. The limiting plate 31 plays a limiting role on the button 41, which can limit the pressing stroke of the button 41 and ensure that the through hole 213 and the large hole 4111 of the locking hole 411 are accurately aligned each time the button 41 is pressed, which is convenient for removing the buckle 12 and also convenient for the ejection mechanism 7 to push the buckle 12 out of the through hole 213. The first positioning plate 32 can fix the ejection mechanism 7 to prevent the ejection mechanism 7 from loosening from the second placement groove 212. The second positioning plate 33 is used to fix the password mechanism 6 to prevent the password mechanism 6 from loosening.

[0056] As attached Figure 12-13 As shown, when the pressing part 415 presses the combination mechanism 6, the buckle 12 can pass through the through hole 213 and the locking hole 411 in sequence through the side wall of the lock case 2, and the buckle 12 abuts against the ejector 71, so that the ejector 71 can automatically push the buckle 12 out of the locking hole 411 and the through hole 213 when unlocking. In addition, the pressing part 415 can abut against the outer wall of the second placement groove 212, thereby limiting the reset stroke of the button 41, so that the through hole 213 corresponds to the small hole 4112 of the locking hole 411, and further stabilize the button 41 after reset.

[0057] As one example, as shown in the appendix Figure 7-9As shown, the aforementioned password mechanism 6 includes a push rod 61, a third spring 62, several bushings 63, and a number of password wheels 64 matching the number of bushings 63. The push rod 61 is movably installed within the receiving cavity 21 (the push rod 61 can move along its axial direction), and one end of the push rod 61 has an integrally formed protrusion 65. The third spring 62 and several bushings 63 are sequentially sleeved on the push rod 61, with the third spring 62 close to the protrusion 65. The password wheels 64 are sleeved on the bushings 63, and the password wheels 64 and bushings 63 are toothed to each other. The push rod 61 has key blocks 611 spaced at intervals along its axial direction, with a number matching the number of bushings 63. The inner wall of the bushing 63 has through grooves 633 through which the key blocks 611 can pass. When multiple key blocks 611 are provided, the distance between adjacent key blocks 611 is equal, and the multiple key blocks 611 are aligned in a straight line.

[0058] Specifically, the third spring 62 can reset the protrusion 65. A toothed block is provided on the circumferential surface of the bushing 63, and a toothed groove is provided on the inner wall of the combination wheel 64. When the combination wheel 64 is fitted onto the bushing 63, the toothed block corresponds to the toothed groove, so that turning the combination wheel 64 will drive the bushing 63, thereby aligning the through groove 633 on the inner wall of the bushing 63 with the key block 611 on the push rod 61. Meanwhile, as shown in the attached... Figure 8 As shown, the number of combination wheels 6464 can be set as needed; it can be 4, 3, 2, or 1. The more combination wheels 6464 there are, the more complex the combination, and the harder the lock is to open. Each combination wheel 6464 has 10 numbers from 0 to 9 on its circumference, and the combination can be adjusted by moving the wheels to get the correct combination.

[0059] First, a third spring 62 and several bushings 63 are fitted onto the push rod 61. Then, a combination wheel 64 is fitted onto the bushings 63. Next, the push rod 61 is movably installed in the receiving cavity 21, allowing it to move along its axis. The combination wheel 64 is turned to set the combination to the correct combination. When the key block 611 on the push rod 61 aligns with the through groove 633 on the inner wall of the bushing 63, pressing the button 41 causes the pressing part 415 to press against the protrusion 65 (the parts where the pressing part 415 and the protrusion 65 abut against each other are both curved surfaces 4151, which can reduce friction and resistance). The protrusion 65 can then approach the shaft. Move the buckle 63, and the sliding part 414 will move. The locking part 121 of the buckle 12 will disengage from the small hole 4112 of the locking hole 411 and align with the large hole 4111 of the locking hole 411. The buckle 12 can then be removed, and the combination lock will be unlocked. Alternatively, press the button 41 first, and pass the buckle 12 through the through hole 213 on the side wall of the lock case 2 and the large hole 4111 of the locking hole 411 in sequence. Then release the button 41, so that the locking part 121 of the buckle 12 and the small hole 4112 of the locking hole 411 are locked together. Then scramble the combination wheel 64, and the combination lock will be locked.

[0060] Among them, as attached Figure 5As shown, the centerline of the third spring 62 is perpendicular to the centerline of the first spring 43. For example, the force between the sliding part 414 and the first spring 43 is in the Y-axis direction, and the force between the third spring 62 and the protrusion 65 is in the X-axis direction. Since the side of the sliding part 414 abuts against the inner wall of the receiving cavity 21 where the through hole 213 is located, the force of the third spring 62 on the protrusion 65 is further acted on the inner wall of the receiving cavity 21 where the through hole 213 is located through the pressing part 415 and the sliding part 414. That is, most of the force of the third spring 62 on the protrusion 65 is distributed in the X-axis direction, reducing the component force in the Y-axis direction, thus making it easier to press the button 41.

[0061] Additionally, in some embodiments, as shown in the appendix Figure 8 As shown, the combination mechanism 6 also includes a mounting base 5, which is placed inside the receiving cavity 21. The mounting base 5 has a receiving groove 51. One end of the push rod 61 is engaged with a slot at one end of the receiving groove 51 via a protrusion 65, and the other end of the push rod 61 is installed in a mounting hole 54 on the end wall of the other end of the receiving groove 51. The push rod 61, the third spring 62, the bushing 63, and the combination wheel 64 can be installed on the mounting base 5 first, and then the mounting base 5 can be placed inside the receiving cavity 21. Compared to assembling directly inside the receiving cavity 21 of the lock case 2, this increases the worker's operating space, improves operating efficiency, facilitates assembly, and thus improves production efficiency.

[0062] Furthermore, in the aforementioned mounting base 5, at least two sets of spaced-apart limiting protrusions 52 are provided on the inner walls of both sides of the receiving groove 51, and the combination wheel 64 is located between at least two sets of limiting protrusions 52. By limiting the combination wheel 64 with the two sets of limiting protrusions 52, the problem of the combination wheel 64 disengaging from the bushing 63 due to shaking during the process of being turned is reduced.

[0063] Additionally, as attached Figure 5-8 As shown, the aforementioned password mechanism 6 also includes a gasket 66 and a code-changing component 67. The gasket 66 is fitted onto the push rod 61 and located between the third spring 62 and the bushing 63, which can reduce the friction between the third spring 62 and the bushing 63 and reduce the wear of the bushing 63. One end of the code-changing component 67 is fitted onto the push rod 61 and located between the bushing 63 and the end wall of the other end of the receiving groove 51. The other end of the code-changing component 67 can be engaged with the locking position A55 or locking position B56 at the bottom of the receiving groove 51. Locking position A55 and locking position B56 are connected. Locking position A55 corresponds to the straight line where the push rod 61 is located, and locking position B56 is offset from the straight line where the push rod 61 is located. In the direction of the straight line where the push rod 61 is located, the distance from locking position A55 to the bushing 63 is greater than the distance from locking position B56 to the bushing 63. This facilitates the manufacturer to uniformly change the factory initial password.

[0064] The principle behind the manufacturer's unified change of the initial password: Under normal circumstances, the other end of the password changer 67 is engaged in slot A55. When the initial password needs to be changed, since the current password is correct, the other end of the password changer 67 is moved to slot B56. At this time, the key block 611 of the push rod 61 corresponds to the through groove 633 of the bushing 63 on a straight line and is located on the same straight line. Since the distance from slot A55 to bushing 63 is greater than the distance from the slot to bushing 63, the password changer 67 will push the bushing 63 towards the protrusion 65 and compress the third spring 62. At this time, the key block 611 of the push rod 61... Within the through groove 633 of the bushing 63, the bushing 63 cannot rotate, and the combination wheel 64 remains in its original position. However, at this time, the combination wheel 64 disengages from the bushing 63 and can be moved to a new combination. Then, the other end of the code-changing component 67 is moved to the locking position A55, the bushing 63 moves away from the protrusion 65 and resets, and the combination wheel 64 engages with the bushing 63. At this time, the key block 611 of the push rod 61 disengages from the through groove 633 of the bushing 63, and the new combination is the factory default combination. This method facilitates assembly, eliminates the need for prolonged pressing of the code-changing component 67, saves effort, and allows for a unified factory default combination.

[0065] To facilitate users changing their passwords, please see the attached document. Figure 7-8 As shown, a socket 57 can be made below the mounting hole 54. The position of the socket 57 corresponds to the position of the code-changing component 67. A pin can be inserted into the socket 57, so that the pin can push against the code-changing component 67, thereby causing the code-changing component 67 to push the bushing 63 towards the protrusion 65 and compress the third spring 43. If the code is correct, the code can also be changed according to the principle described above. However, this method requires the pin to be kept pushing against the code-changing component 67, and the mounting base 5 needs to be removed from the lock housing 2. Alternatively, a through hole 214 can be made on the side wall of the lock housing 2, with the position of the through hole 214 corresponding to the position of the socket 57. A pin can be inserted into the through hole 214 and then the socket 57 in sequence, so that the pin can push against the code-changing component 67. Similarly, according to the principle described above, the code can also be changed. This method does not require removing the mounting base 5 from the lock housing 2. (See attached image) Figure 6-8 As shown, a third positioning plate 34 is provided on the rear cover 3. The third positioning plate 34 can fix the other end of the code changer 67, so that it can only move along the axis of the push rod 61. In this way, the other end of the code changer 67 will not move from the locking position A55 to the locking position B56.

[0066] In some embodiments, when a user forgets their password, they need to open the back cover 3 and remove the mounting bracket 5, as shown in the attached document. Figure 6 As shown, the bottom of the receiving groove 51 is provided with an observation window 53, and the side wall of the bushing 63 is provided with a limiting protrusion 631, as shown in the attached figure. Figure 9As shown, the limiting protrusion 631 has a marking portion 632. The marking portion 632 can be a rectangular plane on the limiting protrusion 631. Setting the limiting protrusion 631 allows for gaps between two or more combination wheels 64. Thus, the marking portion 632 can be seen through the observation window 53 and the gaps. Since the push rod 61 does not rotate, turning the combination wheel 64 drives the bushing 63. Through the observation window 53, it can be seen that the marking portion 632 or the marking portions 632 of several bushings 63 are aligned in a straight line. That is, when the through groove 633 of the bushing 63 is adjusted to correspond to the key block 611 on the push rod 61, it proves that the combination wheel 64 has been turned to the current correct combination, making it convenient for the user to find the current correct combination if they forget it.

[0067] A brief description of the working principle of this utility model: as shown in the attached document. Figure 13 As shown, when the combination wheel 64 is turned to the correct combination, pressing the button 41 at one end through the side wall of the lock housing 2 causes the pressing part 415 to press the protrusion 65 towards the bushing 63. This allows the locking part 121 to disengage from the locking hole 411, and the buckle 12 is released sequentially from the locking hole 411 on the button 41 and the through hole 213 on the side wall of the lock housing 2, thus unlocking the combination lock. When locking the combination lock, the combination mechanism 6 is turned to the correct combination. Pressing the button 41 at one end through the side wall of the lock housing 2 causes the pressing part 415 to press the protrusion 65 towards the bushing 63. This allows the buckle 12 to pass sequentially from the through hole 213 on the side wall of the lock housing 2 and the locking hole 411 on the button 41. After releasing the pressing hand, the button 41 returns to its original position under the action of the first spring 43, locking the locking part 121 and the locking hole 411. Figure 12 As shown, then scramble the combination on wheel 64, and the combination lock will be locked.

[0068] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A combination lock, characterized by: include A fixed base (1) is provided with a connecting rope (11), and a buckle (12) is provided at one end of the connecting rope (11) away from the fixed base (1). Lock case (2), the lock case (2) is provided with an open receiving cavity (21), and the receiving cavity (21) is provided with a password mechanism (6); The pressing mechanism (4) includes a button (41) and a first spring (43). The button (41) has a locking hole (411). One end of the button (41) passes through the side wall of the lock shell (2), and the other end of the button (41) abuts against the first spring (43). The end of the first spring (43) away from the button (41) abuts against the inner wall of the receiving cavity (21). The key mechanism (6) can be squeezed by the button (41) so that the buckle (12) can pass through the through hole (213) on the side wall of the lock case (2) and the locking hole (411) on the button (41) in sequence, and the buckle (12) and the button (41) can be locked or disengaged from each other.

2. A combination lock according to claim 1, characterized in that: The button (41) includes an integrally formed sliding part (414) and a pressing part (415). The receiving cavity (21) is provided with a first placement groove (211). The sliding part (414) and the first spring (43) are placed in the first placement groove (211). One end of the sliding part (414) passes through the side wall of the lock shell (2). The pressing part (415) is provided at the other end of the sliding part (414) and is placed outside the first placement groove (211). The through hole (213) is located on one side of the first placement groove (211). The locking hole (411) is provided on the sliding part (414). The password mechanism (6) can be pressed through the pressing part (415).

3. A combination lock according to claim 2, characterized in that: The locking hole (411) is a gourd-shaped hole with a large hole (4111) and a small hole (4112) communicating with each other. The small hole (4112) is close to the first spring (43), and the large hole (4111) is far away from the first spring (43). The buckle (12) is provided with a locking part (121).

4. A combination lock according to claim 2, characterized in that: A groove (412) is provided between the sliding part (414) and the pressing part (415) to cooperate with the side wall of the first placement groove (211).

5. A combination lock according to claim 2, characterized in that: The sliding part (414) is fitted with a protective cap (42) at one end that passes through the side wall of the lock housing (2).

6. A combination lock according to claim 2, characterized in that: The sliding part (414) has a protrusion (413) at one end near the pressing part (415), and one end of the first spring (43) is sleeved on the protrusion (413).

7. A combination lock according to claim 2, characterized in that: The combination lock also includes an ejection mechanism (7). The receiving cavity (21) is provided with a second placement groove (212) for placing the ejection mechanism (7). The second placement groove (212) communicates with the first placement groove (211) and the second placement groove (212) corresponds to the through hole (213). The ejection mechanism (7) includes an ejection member (71) and a second spring (72). The ejection member (71) is a cylindrical structure. One end of the second spring (72) is placed inside the ejection member (71), and the other end of the second spring (72) abuts against the inner wall of the second placement groove (212). The pressing part (415) can abut against the outer wall of the second placement groove (212). The combination lock can be pressed by the pressing part (415) so that the buckle (12) can pass through the through hole (213) and the locking hole (411) of the side wall of the lock shell (2) in sequence, and the buckle (12) abuts against the ejection member (71).

8. A combination lock according to claim 3, characterized in that: The cryptographic mechanism (6) includes a push rod (61), a third spring (62), several bushings (63), and a number of cryptographic wheels (64) matching the number of bushings (63). The push rod (61) is movably installed in the receiving cavity (21), and one end of the push rod (61) is provided with a protrusion (65). The third spring (62) and several bushings (63) are sequentially sleeved on the push rod (61), and the third spring (62) is close to the protrusion (65). The cryptographic wheels (64) are sleeved on the bushings (63), and the cryptographic wheels (64) and bushings (63) are toothed to each other. The push rod (61) is provided with a number of key blocks (611) at intervals along the axial direction matching the number of bushings (63). The inner wall of the bushing (63) is provided with a through groove (633) through which the key blocks (611) can pass, so that the pressing part (415) can press the protrusion (65). The centerline of the third spring (62) is perpendicular to the centerline of the first spring (43), and the side of the sliding part (414) abuts against the inner wall of the receiving cavity (21) where the through hole (213) is located.

9. A combination lock according to claim 7, characterized in that: The opening is provided with a rear cover (3), and the rear cover (3) is provided with a limiting plate (31), a first positioning plate (32), a second positioning plate (33), and a third positioning plate (34).

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