Secret key square column for mechanical lock and mechanical lock thereof

Abstract

The invention discloses a secret key square column for a mechanical lock and the mechanical lock. The secret key square column comprises an inner square column and an outer square column. The sections of the inner square column and the outer square column are square; the outer end of the inner square column is a first arc surface; the inner end of the outer square column is a second arc surface; the first arc surface is matched with the second arc surface, or the radiuses of the first arc surface and the second arc surface are roughly equal; and the inner square column is shifted by a key to move. The square column cannot rotate in the cross section direction in the square holes of the lock head body and the lock cylinder, it is guaranteed that the arc faces of the inner square column and the outer square column are accurately matched with the arc face of the outer diameter of the lock cylinder, and gaps between the inner square column and the lock cylinder and between the outer square column and the lock cylinder are reduced. The invention aims to overcome the technical defects of the existing pin tumbler lock and blade lock, and provides a safer and more reliable key form of a mechanical lock.

Description

Technical Field

[0001] This invention relates to a mechanical lock, and more particularly to a key for a mechanical lock and the mechanical lock itself. Background Technology

[0002] Existing mechanical locks typically use key types such as pin tumblers and levers. Specifically:

[0003] I. Pin Tumblers. Pin tumbler locks have been around for over 150 years and are still widely used, making them a common type of lock on the market. However, due to the widespread use of pin tumbler lock technology, the disadvantages of pin tumbler locks are becoming increasingly apparent. The disadvantages of pin tumbler locks are as follows: (1) In actual use, cylindrical pins generally rotate radially within the pin hole. To avoid the cylindrical pins colliding with and jamming with the lock cylinder when the lock cylinder rotates, the cylindrical pins and the outer diameter arc of the lock cylinder need to be chamfered. Because the cylindrical pins are chamfered, the gap between the upper and lower cylindrical pins is large, causing the cylindrical pins to slide to the tangent surface of the lock cylinder radius under the pre-tightening rotation and compression of the lock cylinder, thus unlocking the lock.

[0004] (2) General design requirements stipulate that the cylindrical pins should be perpendicular to the key. When the mechanical lock key is designed with double or multiple rows of cylindrical pins, some or all of the cylindrical pins must be positioned away from the lock cylinder diameter (i.e., cylindrical pins parallel to the lock cylinder diameter). The cylindrical pins positioned away from the lock cylinder diameter will inevitably form a large angle with the outer arc surface of the lock cylinder. The farther the cylindrical pins are from the lock cylinder diameter, the larger the angle between the cylindrical pins and the outer arc surface of the lock cylinder. To prevent the cylindrical pins from colliding with and jamming the lock cylinder when it rotates, the arc surface of the cylindrical pins needs to be chamfered with a large radius (i.e., the large radius should be greater than the angle between the cylindrical pins and the outer arc surface of the lock cylinder, see...). Figure 5 Therefore, the gap between the upper and lower cylindrical pins is larger, making it easier to pick the lock using technical means.

[0005] (3) The cross-sectional shape of a ball is generally circular. When the diameter of the circle is equal to the side of the square, the cross-sectional area of ​​the circle is smaller. Under the same material conditions, the shear resistance of the circle is smaller.

[0006] (4) The general design of a pin tumbler lock arranges many pins in a straight line on the lock cylinder. At the same time, in order to increase the shear resistance of the cylindrical pins, the cross-sectional diameter is increased. This reduces the number of possible combinations for the same lock cylinder length. Or, to meet the required number of combinations, the shear resistance is relatively insufficient.

[0007] (5) Existing mechanical locks with key cylindrical pins can be unlocked using tools such as single hooks, vibration unlockers, and tin foil. easy unlock;

[0008] II. Cabinet Locks. Commonly used cabinet lock picking tools include cabinet feeler gauges, cabinet rulers, cabinet key picks, and dedicated cabinet lock screwdrivers. The disadvantages of cabinet locks are generally as follows:

[0009] (1) Existing blade locks (with locking pins) have protrusions for key decoding and corresponding slots for locking pins. When we disassemble the same brand and model, we can find that the blade classification is regular. Basically, only the position of the blade protrusion changes. As long as the blade protrusion is moved so that the blade hits the inner diameter arc surface of the lock head, the relative size of the protrusion can be measured. By analogy, the relative size of all blade protrusions can be measured, and the corresponding password unlocking technology can be known.

[0010] Existing blade locks (without locking pins) all have protrusions for key decoding and corresponding recesses in the lock body. When we disassemble the same brand and model, we can find that the blade grading is regular. Basically, only the position of the blade protrusion changes. By moving the blade protrusion so that the blade is pushed to the bottom of the recess in the lock body, we can measure the relative size of the protrusion. By doing so, we can measure the relative size of all blade protrusions and thus know the corresponding password unlocking technology.

[0011] (2) The blades of the leaf locks on the market are relatively thin, with low shear resistance, and are easy to unlock using shear force.

[0012] (3) For V-shaped notch-type leaf locks, the lock cylinder needs to have leaf grooves cut into the left, right, and top parts, resulting in the lock cylinder being hollowed out, making it more fragile and easily pried open. People can use methods to damage the lock cylinder to achieve the purpose of unlocking;

[0013] (4) Due to their working principle and shape, the blade locks on the market have limited space for blade movement, which means that the blade only slightly jams the lock body, making it weak and easy to pry open, resulting in poor security.

[0014] (5) When all the notches of the blades are aligned, the locking pin falls into the notches of all the blades, thus unlocking. Because the locking pin always exerts downward pressure on the blades, insert the tool into the blades on the left and right sides to find the approximate position. Finally, the locking pin falls into the notches of all the blades, thus unlocking.

[0015] (6) For existing key blade mechanical locks, use an unlocking tool to insert the blank into the blade lock cylinder, gently turn the handle to make the lock cylinder rotate within the free range, the lock head body exerts a certain pressure on the blade, and then move the lever (or hook) to move the blade, separating the blade from the lock head body one by one and allowing them all to enter the blade hole of the lock cylinder, thereby achieving the purpose of unlocking.

[0016] (7) When the key method of the existing mechanical lock is a blade, the lock cylinder needs to have holes on both sides to make the blade work normally. When the lock is locked, the blade only extends into the lock head body on one side and gets stuck. It is easy to be squeezed, slid and sheared, which leads to technical unlocking. Also, because the lock cylinder has holes on both sides, in order to ensure the strength of the lock cylinder, the number of passwords for the blade lock is less under the same length of lock cylinder. Summary of the Invention

[0017] The purpose of this invention is to overcome the shortcomings of existing pin tumbler locks and wafer locks, and to provide a new key post for mechanical locks. Because the key post does not rotate within the cross-sectional direction of the square hole, it allows for precise fit between the inner and outer square posts' arc surfaces, reducing the gap between them. It also increases the number of keys and the shear strength of the keys.

[0018] To achieve the above objectives, the present invention provides the following technical solution:

[0019] A key post for a mechanical lock, wherein the inner post is moved by a key, and the post includes an inner post and an outer post; the cross-section of the inner post and the outer post is square; the outer end of the inner post is a first arc surface; the inner end of the outer post is a second arc surface; the first arc surface and the second arc surface coincide, or the first and second arc surfaces are arc surfaces with approximately equal radii.

[0020] Furthermore, the cross-sectional shape of the square column is square. The cross-sectional shape of the square column is rectangular.

[0021] Furthermore, the inner end of the inner square column is pointed (needle-shaped), round, elliptical, rectangular, square, or polygonal.

[0022] Furthermore, the first arc surface of the inner square column and the second arc surface of the outer square column have a common center.

[0023] The mechanical lock constructed from square posts provided by this invention has the following technical solution:

[0024] A mechanical lock includes a lock cylinder, a lock head body, and a spring; it also includes square posts, which are divided into an inner square post and an outer square post; the cross-section of the inner and outer square posts is square; the spring is installed at the outer end of the outer square post or outside the outer end; the lock cylinder and the lock head body are provided with holes corresponding to the inner and outer square posts; the outer end of the inner square post is a first arc surface; the inner end of the outer square post is a second arc surface; the first arc surface and the second arc surface coincide with the outer diameter arc surface of the lock cylinder, or the first arc surface, the second arc surface, and the outer diameter arc surface of the lock cylinder have approximately equal radii.

[0025] The spring can be a cylindrical spring, a tower-shaped spring, a rectangular spring, or an elliptical spring, etc.

[0026] The mechanical lock uses a combination of cylindrical springs, conical springs, or rectangular springs, and / or a combination of the same type of springs, which differ in wire diameter, outer diameter, pitch, and material. Because the spring constants are different, this increases the difficulty of using a hook-and-lock method to determine whether the square pillars are open or locked. Furthermore, using conical springs can shorten the depth of the square pillar well, thus shortening the diameter of the outer lock core shell.

[0027] The cylindrical spring, tower spring, rectangular spring, or elliptical spring is installed at or outside the outer end of the outer square column.

[0028] The outer square column extends into a spring-fixed column at its outer end.

[0029] The cylindrical spring, tower spring, rectangular spring, or elliptical spring is mounted on the spring fixing post.

[0030] When the mechanical lock is in the locked state, the outer square post extends beyond the lock head body into the lock cylinder under the action of the spring, and is in the locked state.

[0031] When the original key is inserted into the keyhole, the outer and inner square pillars move within the holes of the lock cylinder and lock head body under the action of the spring and the key. The first arc surface of the inner square pillar fits against the second arc surface of the outer square pillar.

[0032] Once the key and the square post are properly aligned, the first and second arc surfaces reach the outer diameter arc surface of the lock cylinder, allowing the lock cylinder to rotate. After the key rotates the lock cylinder, the first arc surface fits into the inner hole arc surface of the lock head, and the second arc surface fits into the outer diameter arc surface of the lock cylinder.

[0033] Once the key and the square post are properly aligned, both the first and second arc surfaces reach the outer diameter arc surface of the lock cylinder, allowing the lock cylinder to rotate. After the key rotates the lock cylinder, the first arc surface fits against the arc surface of the lock head body, and the second arc surface fits against the outer diameter arc surface of the lock cylinder.

[0034] This invention also provides a mechanical lock implemented using a key composed of non-cylindrical cylindrical prisms, the technical solution of which is as follows:

[0035] A mechanical lock includes a lock cylinder, a lock head body, and a spring; it also includes a key post, which is divided into an inner post and an outer post; the cross-sections of the inner post and the outer post are triangular, polygonal, trapezoidal, or other non-cylindrical shapes; the spring is installed on the outer end of the outer post or outside the outer end; the lock cylinder and the lock head body have holes corresponding to the inner and outer posts; the outer end of the inner post is a first arc surface; the inner end of the outer post is a second arc surface; the first arc surface matches the second arc surface and the outer diameter arc surface of the lock cylinder, or the first arc surface, the second arc surface, and the outer diameter arc surface of the lock cylinder are arc surfaces with approximately equal radii.

[0036] Furthermore, the first arc surface, the second arc surface, and the outer diameter arc surface of the lock cylinder are concentric circles.

[0037] The following comparison of the key column of the present invention with the prior art demonstrates the following beneficial effects:

[0038] (1) Cylindrical pins: In practical use, cylindrical pins... generally It will rotate radially within the pin hole. To prevent the cylindrical pin from colliding with and jamming the lock cylinder when it rotates, the corresponding points of the cylindrical pin and the radius arc of the lock cylinder need to be rounded. Because of the rounded corners of the cylindrical pin, the gap between the upper and lower cylindrical pins is large, causing the cylindrical pin to slide to the radius arc surface of the lock cylinder, i.e., the tangential surface, under the pressure of the lock cylinder's pre-tightening rotation, thus technically unlocking the lock.

[0039] Square pillars: During the lock opening and closing process, the inner and outer square pillars will not rotate radially within the square pillar holes. When the lock cylinder rotates, the square pillars will not collide or jam with the lock cylinder. Therefore, the key square pillars only need to be rounded slightly to maintain a precise fit between the inner and outer square pillars and to ensure that the arc surfaces of the inner and outer square pillars are consistent with the arc height of the outer diameter of the lock cylinder. This increases the precision of the key square pillars and enhances the possibility of secure lock use.

[0040] (2) Cylindrical marble:

[0041] To maintain the perpendicularity of the cylindrical pins to the key, when the mechanical lock key is designed with double or multiple rows of cylindrical pins, some or all of the cylindrical pins must be positioned away from the lock cylinder diameter (i.e., cylindrical pins parallel to the lock cylinder diameter). The cylindrical pins positioned away from the lock cylinder diameter will inevitably form a large angle with the outer arc surface of the lock cylinder. The farther the cylindrical pins are from the lock cylinder diameter, the larger the angle between the cylindrical pins and the outer arc surface of the lock cylinder. To prevent the cylindrical pins from colliding with and jamming the lock cylinder during rotation, the arc surface of the cylindrical pins needs to be rounded with a large radius (i.e., the large radius should be greater than the angle between the cylindrical pins and the outer arc surface of the lock cylinder; see appendix). Figure 6 Therefore, the gap between the upper and lower cylindrical pins is larger, making it easier to pick the lock using technical means.

[0042] Square pillars: During the locking and unlocking process, the inner and outer square pillars will not rotate radially within the square pillar holes. When the lock cylinder rotates, the square pillars will not collide or jam with the lock cylinder. Therefore, the square pillars only need to be rounded slightly to maintain a precise fit between the inner and outer square pillars and to ensure that the arc surfaces of the inner and outer square pillars are consistent with the arc height of the outer diameter of the lock cylinder. Thus, regardless of whether the mechanical lock key square pillars are designed in a single row, double row, or multiple rows, the square pillars will not collide or jam with the lock cylinder when it rotates, increasing the possibility of safe lock use.

[0043] (3) Cylindrical ball: The cross-sectional shape of a ball is generally circular. When the diameter of the circle is equal to the side of the square, the cross-sectional area of ​​the circle is smaller. Under the same material, the circular ball has less shear resistance.

[0044] Square Columns: When the side length of the key square column is the same as the diameter of the key cylindrical pin, the cross-sectional area of ​​the key square column is 1.27 times larger than that of the key cylindrical pin. When the side length of the key rectangular column is the same as the diameter of the key cylindrical pin, when the long side of the rectangular column is 1.5 times the width side, the cross-sectional area of ​​the key rectangular column is 1.91 times larger than that of the key cylindrical pin; when the long side of the rectangular column is twice the width side, the cross-sectional area of ​​the key rectangular column is 2.55 times larger than that of the key cylindrical pin. Therefore, when the cross-sectional area of ​​the square column and the pin is equal to the key spacing, the lock body and lock cylinder of the mechanical lock with a key square column can be made smaller, saving materials and reducing costs. When the key shearing force and the key column spacing are equal, the key square column can hold more passwords.

[0045] (4) Cylindrical pin tumblers: Existing pin tumbler locks typically set the combination by varying the length of the inner pins, while the outer pins and springs remain uniform. When we disassemble the same brand and model, we can find that the grading of the inner pins follows a pattern. By simply pushing the inner pin outwards to its designated position (i.e., pressing against the bottom of the pin hole in the lock body), we can measure the length of the inner pin. By doing so, we can measure the length of all the inner pins and thus determine the corresponding combination unlocking technique.

[0046] Square pillar: The combination of the inner square pillar, outer square pillar and spring is used to form the password (all three have variables). That is, when the square pillar holes are of equal depth, even if the inner square pillar is pushed outward to its full position, the length of the inner square pillar cannot be measured, and the corresponding password cannot be known. Therefore, it is impossible to unlock the lock by detecting the password.

[0047] (5) Cylindrical pins: The general design of a pin tumbler lock arranges many pins in a straight line on the lock cylinder. At the same time, in order to increase the shear resistance of the cylindrical pins, the cross-sectional diameter is increased. This reduces the number of possible combinations for the same lock cylinder length. Or, to meet the required number of combinations, the shear resistance is relatively insufficient.

[0048] Square pillars: When the cross-sectional area and spacing of a set of square pillars and a set of pins are equal, the required length of the square pillars is shorter. This allows the lock body and cylinder of the square pillars to be made smaller, saving materials and reducing costs. When the shear force of the square pillars and pins are the same and the spacing between the pillars is equal, the number of possible combinations of square pillars is greater.

[0049] (6) Cylindrical pins: Existing key cylindrical pin mechanical locks are easy to unlock using single hooks, vibration unlockers, tin foil and other unlocking tools.

[0050] Square pillars: Since the key square pillars only need to have small rounded corners and the gap between the inner and outer square pillars is small, the inner and outer square pillars cannot be misaligned, so the outer square pillars will not be stuck by the lock cylinder. Furthermore, the multiple outer square pillars on the mechanical lock are mixed and matched with cylindrical springs, tower springs, or rectangular springs, and / or mixed and matched with the same type of spring. They differ in wire diameter, outer diameter, pitch size, and material. Because the spring coefficients of each spring are different, this increases the difficulty of using the pick hook (single hook) method to determine whether the square pillars are in the open or locked state, and also renders the vibration unlocking device ineffective.

[0051] Because the key post does not rotate and only requires small rounded corners, the gap between the inner and outer posts is small, so the inner and outer posts cannot be misaligned. This prevents the outer post from getting stuck on the lock cylinder, thus eliminating the prerequisite for using tin foil to unlock the lock and preventing tin foil unlocking techniques from being used.

[0052] (7) Leaf ： Existing blade locks (with locking pins) all have protrusions for key decoding and corresponding slots for the locking pins. When we disassemble the same brand and model, we can find that the blade classification is regular. Basically, only the position of the blade protrusion changes. By simply moving the blade protrusion so that the blade hits the inner diameter arc surface of the lock cylinder, we can measure the relative size of the protrusion. By doing so, we can measure the relative size of all blade protrusions and thus know the corresponding password unlocking technology.

[0053] Existing blade locks (without locking pins) all have protrusions for key decoding and corresponding recesses in the lock body. When we disassemble the same brand and model, we can find that the blade grading is regular. Basically, only the position of the blade protrusion changes. By moving the blade protrusion so that the blade is pushed to the bottom of the recess in the lock body, we can measure the relative size of the protrusion. By doing so, we can measure the relative size of all blade protrusions and thus know the corresponding password unlocking technology.

[0054] Square pillar: The combination of the inner square pillar, outer square pillar and spring is used to form the password (all three have variables). That is, when the square pillar holes are of equal depth, even if the inner square pillar is pushed outward to its full position, the length of the inner square pillar cannot be measured, and the corresponding password cannot be known. Therefore, it is impossible to unlock the lock by detecting the password.

[0055] (8) Blade: The blades of the blade locks on the market are relatively thin, with low shear resistance, and are easy to unlock by shearing force.

[0056] Square pillar: The cross-sectional area of ​​a single key square pillar is larger than that of a single key blade. This makes the key square pillar more resistant to shearing, increasing the difficulty of forcefully cutting the key to unlock.

[0057] (9) Blade: For blade locks with V-shaped notches, the lock cylinder needs to have blade slots cut into the left, right, and top parts, which hollows out the lock cylinder, making it more fragile and easy to pry open. People can use methods to damage the lock cylinder to achieve the purpose of unlocking.

[0058] Square key: The key square key only requires a square hole to be made above the lock cylinder, making the lock cylinder stronger and less prone to being pried open.

[0059] (10) Blade: Due to the working principle and shape of the blade lock on the market, the blade has limited space to move, which means that the blade only jams the lock body a little bit, so its bearing capacity is weak and it is easier to pry open, resulting in poor security.

[0060] Square pillar: Due to the working method of the key square pillar, the outer square pillar can penetrate relatively deeply into the hole of the lock cylinder, which makes it more resistant to shearing force, not easy to be pried open, and has high security.

[0061] (11) Blades: When the notches of all blades are aligned, the locking pin falls into the notches of all blades, thus unlocking. Because the locking pin always exerts downward pressure on the blades, insert the tool into the blades to the left and right to find the approximate position. Finally, the locking pin falls into the notches of all blades, thus unlocking.

[0062] Square pillars: The outer and inner square pillars are precisely matched with the lock cylinder, and multiple outer square pillars on the mechanical lock are mixed and matched with cylindrical springs, tower springs, or rectangular springs, and / or mixed and matched with the same type of spring. The wire diameter, outer diameter, pitch size and material are different. Because the spring coefficients of each spring are different, this increases the difficulty of using the pick hook (single hook) method to determine whether the square pillar is in the open or locked state.

[0063] (12) Blade: For mechanical locks with existing key blades, the blank is inserted into the blade lock cylinder using an unlocking tool. The handle is turned gently to allow the lock cylinder to rotate freely. The lock head body exerts a certain pressure on the blade. Then, the lever (or hook) is moved to move the blade, separating the blade from the lock head body one by one and allowing all the blades to enter the blade hole of the lock cylinder, thereby achieving the purpose of unlocking.

[0064] Square pillars: Since the key square pillars only need to have small rounded corners and the gap between the inner and outer square pillars is small, the inner and outer square pillars cannot be misaligned, so the outer square pillars will not be stuck by the lock cylinder. Furthermore, the multiple outer square pillars on the mechanical lock are mixed and matched with cylindrical springs, tower springs, or rectangular springs, and / or mixed and matched with the same type of springs, which differ in wire diameter, outer diameter, pitch size, and material. Because the spring coefficients of each spring are different, this increases the difficulty of using the pick hook (single hook) method to determine whether the square pillars are in the open or locked state.

[0065] (13) Blade: When the existing mechanical lock key method is blade, the lock cylinder needs to have holes on both sides to make the blade work normally; when the lock is locked, the blade only extends into the lock body on one side and gets stuck, which is easy to be squeezed, slid and sheared, resulting in technical unlocking; also, due to the holes on both sides of the lock cylinder, in order to ensure the strength of the lock cylinder, the number of passwords for the blade lock is less under the same length of lock cylinder.

[0066] Square pillars: Due to the working method of the key square pillars, the key outer square pillars can be arranged in multiple directions on the lock cylinder. Therefore, under the same length of lock cylinder, the key square pillars have more possible combinations and greater resistance to shearing. Attached Figure Description

[0067] Figure 1 This is a schematic diagram of the three-dimensional structure of the outer square column according to Embodiment 1 of the present invention;

[0068] Figure 2 This is a schematic diagram of the three-dimensional structure of the inner square column according to Embodiment 1 of the present invention;

[0069] Figure 3 This is a schematic diagram of the three-dimensional structure of the inner square column according to Embodiment 1 of the present invention;

[0070] Figure 4 a is a top view of the mechanical lock according to Embodiment 1 of the present invention;

[0071] Figure 4 b is Figure 4 a. Schematic diagram of the cross section along AA;

[0072] Figure 4 C is Figure 4 a. Cross-sectional view along BB;

[0073] Figure 5 This is a three-dimensional structural diagram of the outer square column (with spring fixing column) of Embodiment 2 of the present invention;

[0074] Figure 6 a is a schematic diagram of a conventional cylindrical pin tumbler lock structure;

[0075] Figure 6 b is Figure 6 A magnified view of part of a;

[0076] Figure 7 This is a comparative diagram of a standard cylindrical ball and a square prism;

[0077] Figure 8 This is a schematic diagram of the construction of a square column with a triangular cross-section, as described in Embodiment 3 of the present invention.

[0078] Figure 9 This is a schematic diagram of the structure of the square column with a polygonal cross-section according to Embodiment 3 of the present invention;

[0079] Figure 10 This is a schematic diagram of the structure of the square column with a trapezoidal cross-section according to Embodiment 3 of the present invention; Detailed Implementation

[0080] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0081] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0082] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0083] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed", "equipped", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or a connection through an intermediate medium; it can be a connection between the internal parts of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0084] Example 1

[0085] See Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a key post for a mechanical lock, the key post comprising an inner square post 2 and an outer square post 1; the cross-sectional shape of the inner square post 2 and the outer square post 1 is square; the outer end 22 of the inner square post is a first arc surface 21; the inner end 13 of the outer square post is a second arc surface 11; the first arc surface 21 and the second arc surface 11 are matched and fitted together, or the radii of the first and second arc surfaces are approximately equal.

[0086] For the preferred solution, please refer to [link / reference]. Figure 3As shown, the center 51 of the first arc surface is the center of the first arc surface 21 corresponding to the outer end 22 of the inner square column; the center 52 of the second arc surface is the center of the second arc surface 11 corresponding to the inner end 13 of the outer square column; the first arc surface 21 and the second arc surface 11 coincide, and the center 51 of the first arc surface and the center 52 of the second arc surface overlap, that is, the first arc surface 21 and the second arc surface 11 coincide, and the first arc surface and the second arc surface have a common center.

[0087] In this embodiment, see Figure 2 As shown, the inner end of the inner square column 2 is square; the inner end 23 of the inner square column 2 can also be simply replaced by a pointed (needle) shape, a circle, an ellipse, a rectangle, a square, or a polygon.

[0088] Example 2

[0089] This embodiment is provided by Figure 1 , 2 Mechanical locks using key-based square pillars, see [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 a, Figure 4 b、 Figure 4 As shown in Figure C, it includes a lock cylinder 5, a lock head body 3, and a spring 33; the square pillars are divided into an inner square pillar 2 and an outer square pillar 1; the cross-sectional shape of the inner square pillar 2 and the outer square pillar 1 is square; the lock cylinder 5 and the lock head body 3 are provided with square holes 31 corresponding to the inner and outer square pillars 1; the inner square pillar 2 is installed in the corresponding square hole 312 of the lock cylinder 5, the outer square pillar 1 is installed in the corresponding square hole 311 of the lock head body 3, the spring 33 is installed at the outer end of the outer square pillar 1, one end of the spring 33 is installed at the outer end 12 of the outer square pillar, and the other end of the spring 33 is sealed in the square hole 311 of the lock head body 3 with a sealing bead 32; the outer end of the inner square pillar 2 is a first arc surface 21; the inner end of the outer pillar 1 is a second arc surface 11; the first arc surface 21 and the second arc surface 22, and the outer diameter arc surface of the lock cylinder 5 are matched and fitted together.

[0090] When the mechanical lock is in the locked state, under the action of the spring 5, the outer square post 1 extends beyond the lock head body 3 into the square hole 312 of the lock cylinder 5, and is in the locked state.

[0091] As the key 4 is inserted into the keyhole, the inner square post 2 and the outer square post 1 move within the holes of the lock cylinder 5 and the lock head body 3, following the rise and fall of the key 4. The first arc surface 21 of the inner square post 2 fits against the second arc surface 11 of the outer square post 1.

[0092] When the key 4 matches the lock cylinder 5 after it is turned, the first arc surface 21 is in contact with the inner arc surface of the lock head body 3, and the second arc surface 11 is in contact with the outer arc surface of the lock cylinder 5.

[0093] In this embodiment, the cross-sectional shape of the inner square column 2 and the outer square column 1 can also be a square, and the corresponding lock cylinder and lock head body 3 are provided with square holes corresponding to the inner and outer square columns.

[0094] Alternatively, the inner square post 2 and the outer square post 1 can also have rectangular cross-sections. The corresponding lock cylinder 5 and lock head body 3 are provided with rectangular holes corresponding to the inner and outer rectangular posts.

[0095] In this embodiment, the outer end of the outer square post 1 can also extend into a spring fixing post 14, which is used to install one end of the spring 33. The other end of the spring 33 is sealed with a sealing bead 32 in the square hole 311 of the lock body 3.

[0096] In this embodiment, the inner end of the inner square column 2 is pointed (needle-shaped), round, elliptical, rectangular, square, or polygonal and matches the key code point.

[0097] Example 3

[0098] See Figures 8-10 As shown, the difference between this embodiment and embodiments one and two is that the cross-sectional shape of the square column is replaced with a triangle 91, a polygon 92, and a trapezoid 93.

[0099] Example 4

[0100] This embodiment compares a conventional cylindrical pin tumbler lock with the square key lock of Embodiment 1.

[0101] Appendix Figure 6 This is a standard cylindrical pin tumbler lock, including upper pins, lower pins, a pin tumbler lock cylinder 63, and a pin tumbler lock head body 6. As shown in the diagram, the gaps between the upper and lower cylindrical pins and the lock cylinder 63 are relatively large. When the mechanical lock key is designed with a double row, to prevent the cylindrical pins from colliding and jamming with the lock cylinder 63 when it rotates, the arc surface of cylindrical pin 1 (61), which is closer to the lock cylinder centerline 64, needs to have a large rounded corner 68. Meanwhile, cylindrical pin 2 (62), which is parallel to and away from the lock cylinder centerline 64, forms an even larger angle with the outer diameter arc surface of the lock cylinder. Therefore, cylindrical pin 2 and the outer diameter arc surface of the lock cylinder need to have an even larger rounded corner 67. This results in a larger gap between the upper and lower cylindrical pins, making it easier to pick using technical means.

[0102] Appendix Figure 7This diagram compares the cross-sectional areas of a standard cylindrical pin 8 and a square pin 7. When the diameter of the cylindrical pin 8 and the side length of the square pin 7 are the same, the ratio of the diameter of the cylindrical pin 8 to the cross-sectional area of ​​the square pin 7 is 0.7854:1. Therefore, when the diameter of the cylindrical pin 8 and the side length of the square pin 7 are the same, the cross-sectional area of ​​the square pin 7 is larger, meaning it has greater shear resistance. With the pin spacing S1 (distance 81) remaining constant, and the diameter of the cylindrical pin 8 and the cross-sectional area of ​​the square pin 7 being equal, the side length of the square pin 7 is shorter, meaning the S2 distance 82 is shorter. Therefore, the lock body and lock cylinder can be made smaller, saving materials and reducing costs.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, should fall within the protection scope of the present invention.

Claims

1. A key post for a mechanical lock, characterized in that: The key column includes an inner column and an outer column; The cross-sections of the inner and outer square columns are square. The outer end of the inner square column is a first arc surface; the inner end of the outer square column is a second arc surface. The first arc surface matches the second arc surface, or the radii of the first and second arc surfaces are approximately equal; the inner square column moves when turned by a key.

2. A key post for a mechanical lock according to claim 1, characterized in that: The first arc surface of the inner square column and the second arc surface of the outer square column have a common center.

3. A key post for a mechanical lock according to claim 1, characterized in that: The cross-section of the square column is square.

4. A key post for a mechanical lock according to claim 1, characterized in that: The cross-section of the square column is rectangular.

5. A mechanical lock according to claim 1, characterized in that: The inner end of the inner square column is pointed (needle-shaped), round, elliptical, rectangular, square, or polygonal.

6. A mechanical lock, comprising a lock cylinder, a lock head body, and a spring; characterized in that... It also includes square pillars, which are divided into inner and outer square pillars; the cross-sections of the inner and outer square pillars are square; the spring is installed at or outside the outer end of the outer square pillar; the lock cylinder and lock head body are provided with holes corresponding to the inner and outer square pillars; the outer end of the inner square pillar is a first arc surface; the inner end of the outer square pillar is a second arc surface; the first arc surface and the second arc surface match the outer diameter arc surface of the lock cylinder, or the radii of the first and second arc surfaces and the outer diameter arc surface of the lock cylinder are approximately equal.

7. A mechanical lock according to claim 6, characterized in that: The outer and inner square columns have square cross-sections.

8. A key post for a mechanical lock according to claim 6, characterized in that: The outer and inner square columns have rectangular cross-sections.

9. A mechanical lock according to claim 6, characterized in that: The inner end of the inner square column is pointed (needle-shaped), round, elliptical, rectangular, square, or polygonal.

10. A mechanical lock according to claim 6, characterized in that: The spring is a cylindrical spring, a tower spring, a rectangular spring, or an elliptical spring; the multiple outer square posts on the mechanical lock use a combination of cylindrical springs, tower springs, or rectangular springs, and / or a combination of the same type of spring, but differ in wire diameter, outer diameter, pitch size, and material.

11. A mechanical lock according to claim 10, characterized in that: The cylindrical spring, tower spring, rectangular spring, or elliptical spring is installed at or outside the outer end of the outer square column.

12. A key post for a mechanical lock according to claim 6, characterized in that: The outer square column extends to the spring fixing part at the outer end of the outer square column; the cylindrical spring, tower spring, rectangular spring, or elliptical spring is installed in the spring fixing part.

13. The mechanical lock according to any one of claims 6-12, characterized in that: When the mechanical lock is in the locked state, the outer square post extends beyond the lock cylinder body into the inner hole of the lock cylinder, and is in the locked state. When the key is inserted into the keyhole, the inner and outer square posts move within the holes of the lock cylinder and lock cylinder body as the key moves. The first arc surface of the inner square post fits against the second arc surface of the outer square post. When the key matches the square post combination, the lock cylinder rotates to the unlocked state, where the first arc surface fits against the arc surface of the inner hole of the lock cylinder body, and the second arc surface fits against the arc surface of the outer diameter of the lock cylinder.

14. A mechanical lock, comprising a lock cylinder, a lock head body, and a spring; characterized in that... It also includes a key column, which is divided into an inner column and an outer column; the cross-section of the inner column and the outer column is triangular, polygonal, trapezoidal or other non-circular; the spring is installed on the outer end of the outer column or outside the outer end; the lock cylinder and lock head body are provided with holes corresponding to the inner and outer columns; the outer end of the inner column is a first arc surface; the inner end of the outer column is a second arc surface; the first arc surface matches the second arc surface and the outer diameter arc surface of the lock cylinder, or the radii of the first arc surface, the second arc surface and the outer diameter arc surface of the lock cylinder are approximately equal.

15. The mechanical lock according to claim 14, characterized in that... The first arc surface, the second arc surface, and the outer diameter arc surface of the lock cylinder are concentric circles.

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