CN111287584A - Novel double-key linkage safe deposit box lock and lock chip design method - Google Patents

Abstract

A design method of a double-key linkage safe deposit box lock and a lock chip comprises an upper lock shell, a lower lock shell, a first key and a second key, wherein a lock tongue and a linkage block are installed in the lower lock shell, the rear end of the lock tongue is positioned at the front end of the linkage block, the backward unlocking of the lock tongue is controlled by the linkage block, a first lock cylinder pulling sleeve and a second lock cylinder pulling sleeve are installed in the upper lock shell, the first lock cylinder pulling sleeve is positioned above the lock tongue, an eccentric cylindrical table at the bottom end of the first lock cylinder pulling sleeve is in linkage with the lock tongue in a matching way, the second lock cylinder pulling sleeve is positioned above the linkage block, and an eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve; the lock core pulling sleeve I is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces I matched with the key I which are sequentially connected, and the lock core pulling sleeve II is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces II matched with the key II which are sequentially connected. The invention adopts a pure mechanical structure that double keys and double lock cylinders are mutually restricted and linked through the lock tongue and the linkage block, has good reliability, meets the requirement of double insurance of users and improves the anti-theft security performance.

Description

Novel double-key linkage safe deposit box lock and lock chip design method

The technical field is as follows:

the invention relates to a lockset, in particular to a novel double-key linkage safe box lock and a design method of a lock chip.

Background art:

the lock core structure of the existing double-key linkage lock of the safe deposit box is complex, and iron lock chips with various structures need to be manufactured in the lock due to the complex structure of the lock core, so that the parts are large in size and poor in rigidity and strength, but the lock core of the lock is very complex in processing, assembling, debugging and using, so that the firmness, confidentiality and reliability of the existing double-key linkage lock of the bank safe deposit box are not ideal, and the existing lock is difficult to meet the use requirement of the high-quality bank safe deposit box.

The invention content is as follows:

the technical problem to be solved by the invention is as follows: the problems in the prior art are solved, the novel double-key linkage safe box lock and the design method of the lock chip are provided, a pure mechanical structure is adopted, the reliability is good, the requirements of double insurance of a user are met, and the anti-theft confidentiality is further improved.

The technical scheme adopted by the invention is as follows: a double-key linkage safe deposit box lock comprises an upper lock shell, a lower lock shell, a first key and a second key, wherein a spring bolt and a linkage block are installed in the lower lock shell, the rear end of the spring bolt is positioned at the front end of the linkage block, the spring bolt retreats to unlock and is controlled by the linkage block, a first lock cylinder pulling sleeve and a second lock cylinder pulling sleeve are installed in the upper lock shell, the first lock cylinder pulling sleeve is positioned above the spring bolt, an eccentric cylindrical table at the bottom end of the first lock cylinder pulling sleeve is matched and linked with the spring bolt, the second lock cylinder pulling sleeve is positioned above the linkage block, and an eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve is matched and linked with; the lock core pulling sleeve I is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces I matched with the key I which are sequentially connected, and the lock core pulling sleeve II is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces II matched with the key II which are sequentially connected.

In the technical scheme, an eccentric cylindrical table is formed at the bottom end of the lock cylinder pulling sleeve, a waist-shaped hole is formed in the lock tongue correspondingly, and the eccentric cylindrical table at the bottom end of the lock cylinder pulling sleeve is sleeved in the waist-shaped hole of the lock tongue to be matched and linked.

In the technical scheme, one end of the linkage block is provided with a rotating hole, a shaft post is formed on the lower lock shell, the rotating hole of the linkage block is sleeved on the shaft post of the lower lock shell, a linkage block pressure spring is additionally arranged between one end of the linkage block and the shaft post of the lower lock shell, the linkage block pressure spring applies counterclockwise pressure to the linkage block, and a limiting block is formed on the lower lock shell close to the other end of the linkage block; and an eccentric cylindrical table is formed at the bottom end of the second lock cylinder pulling sleeve, and the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve is tightly close to the inner side of the linkage block, so that the linkage block is in linkage with the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve in a matching way.

In the technical scheme, the bottoms of the first lock cylinder pulling sleeve and the second lock cylinder pulling sleeve are disc-shaped bases, the upper parts of the first lock cylinder pulling sleeve and the second lock cylinder pulling sleeve are cylinders with notches formed in the left side and the right side, and the disc-shaped bases are assembled in the upper lock shell through large round pads and clamping rings.

In the technical scheme, a first lock cylinder hole sleeved with a first lock cylinder pulling sleeve and a second lock cylinder hole sleeved with a second lock cylinder pulling sleeve are respectively formed in the upper lock shell, a left groove and a right groove corresponding to the left gap and the right gap of the first lock cylinder pulling sleeve are formed in the inner wall of the first lock cylinder hole, and a left groove and a right groove corresponding to the left gap and the right gap of the second lock cylinder pulling sleeve are formed in the inner wall of the second lock cylinder hole.

In the technical scheme, the middle part of the first lock chip is provided with a special-shaped lock hole with a central symmetry point, two ends of the first lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the first lock cylinder pulling sleeve; two ends of the lock core piece can move in the notches on the left side and the right side of the lock core pulling sleeve I and the left groove and the right groove of the inner wall of the lock core hole I; the middle part of the second lock chip is also provided with a special-shaped lock hole with a central symmetry point, two ends of the second lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the second lock core pull sleeve; two ends of the lock core piece II can move in the notches on the left side and the right side of the lock core pulling sleeve II and the left groove and the right groove of the inner wall of the lock core hole II.

In the technical scheme, the front end of the lower lock shell is provided with a bolt outlet hole, the front end of the bolt extends out of or retracts back from the bolt outlet hole, the linkage block is of an arch structure, and the eccentric cylinder at the two bottom ends of the lock cylinder pulling sleeve is positioned and tightly leaned against the inner side of the arch structure of the linkage block.

In the technical scheme, the first lock chip or the second lock chip is designed into a special-shaped long strip, and the thickness of the middle part is smaller than that of the two end parts; the lock chip is provided with a special-shaped lock hole with a central symmetry point in the middle, the left side and the right side of the special-shaped lock hole are provided with a section of mutually parallel sides, an eccentric distance is reserved between the central symmetry point of the special-shaped lock hole and the circle center of the circular arcs at the two ends of the lock chip, and different eccentric values correspond to different lock chips.

In the technical scheme, the cross section of the key blank of the key I or the key II is a special-shaped strip section with two flat ends and a convex circular arc in the middle; the different depth positions of the key I or the key II correspond to different lock cylinders, two sides of the cross section of the different depth positions of the key I or the key II are processed into two parallel bevel edges which are parallel to each other, the distance between the two parallel bevel edges is L, the two parallel bevel edges and the vertical center line of the key form an angle of a degree, an eccentric distance e is arranged between the center line of the two parallel edges and the rotation center point of the key, and the eccentric distances of the different depth positions of the key are different.

In the above technical solution, the design method of the lock chip is as follows:

each lock chip is provided with a special-shaped lock hole, and the size and the shape of the special-shaped lock hole of each lock chip are the same; the special-shaped lock holes of each lock chip are designed into symmetrical patterns with central symmetrical points;

the special-shaped lock holes of each lock chip are provided with two parallel bevel edges which are centrosymmetric, and the distance between the parallel bevel edges is L; the two parallel edges are inclined at an angle b relative to the vertical center line of the lock chip;

the two ends of each lock chip are circular arcs which are concentric, and the diameters of the circular arcs at the two ends of each lock chip are equal;

different offset distances d are arranged between the central symmetry point of the two parallel bevel edges of different lock chips and the concentric circle centers of the circular arcs at the two ends.

The working principle and the advantages of the invention are as follows:

the upper lock shell is provided with two lock core holes, wherein a first lock core pulling sleeve is assembled in the first lock core hole, a second lock core pulling sleeve is assembled in the second lock core hole, a plurality of lock chips, small lock chip round pads and top springs which are sequentially connected from top to bottom are arranged in the first lock core pulling sleeve and the second lock core pulling sleeve, the lower part of the lock core pulling sleeve is assembled in the upper lock shell through a large round pad and a snap ring to prevent falling off, a lock tongue and a linkage block are arranged in the lower lock shell, the linkage block is positioned behind the lock tongue, an eccentric cylindrical table for pulling the lock tongue is integrally formed at the bottom end of the first lock core pulling sleeve, and the eccentric cylindrical table at the bottom end of the first lock core pulling sleeve is sleeved in a kidney-shaped hole; the bottom end of the second lock cylinder pulling sleeve is also integrally formed with an eccentric cylindrical table for pulling the linkage block, the eccentric cylindrical table of the second lock cylinder pulling sleeve abuts against the inner side of the linkage block, one end of the linkage block is provided with a rotating shaft hole, the rotating shaft hole of the linkage block is sleeved on a shaft post of the lower lock shell and is additionally provided with a linkage block pressure spring, and the linkage block rotates anticlockwise under the pressure of the linkage block pressure spring to abut against a limiting block. The plurality of lock chips in the first lock core pulling sleeve are pulled by the first key, and the plurality of lock chips in the second lock core pulling sleeve are pulled by the second key.

When the lock is unlocked, the second key is firstly inserted into the second lock chip, the second key rotates in the forward direction to drive the second lock cylinder pulling sleeve to rotate, the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve rotates to pull the linkage block clockwise, the front end of the linkage block leaves the position behind the lock tongue, and the lock tongue moves backwards without blocking. Then, a first key is inserted into a first lock chip, the first key rotates in the forward direction, the first lock core pulling sleeve is driven to rotate by the first lock chip, an eccentric cylindrical table at the bottom end of the first lock core pulling sleeve is sleeved into a kidney-shaped hole in the lock tongue, and the eccentric cylindrical table pulls the lock tongue to retreat so as to realize unlocking.

When the door is locked, a key I is used for reversely driving a lock chip I and a lock cylinder pulling sleeve I to reversely rotate, and an eccentric cylindrical table at the bottom end of the lock cylinder pulling sleeve I drives a lock tongue to move forward to lock the door; and then a second key is used for reversely rotating a second lock chip to drive a second lock cylinder pulling sleeve to rotate, an eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve rotates anticlockwise and leaves a linkage block, the linkage block resets under the action of a pressure spring of the linkage block and is limited by a limiting block on a lower lock shell, at the moment, the front end of the linkage block reaches the position of the rear end of the lock tongue and props against the rear end of the lock tongue, so that the lock tongue cannot retreat to be unlocked, the complete locking of the door is realized, and then the first key and the second key are pulled out.

The transmission principle of the key and the lock chip is as follows:

because the lock core pulling sleeve I and the lock core pulling sleeve II are both internally provided with a plurality of lock chips, when a key is unlocked, in order to ensure that the key can smoothly enter the special-shaped lock holes of the lock chips, the special-shaped lock holes in the middle of the lock chips in the lock core pulling sleeve must be aligned with the lock holes of the upper lock shell, and the symmetrical center points of the special-shaped lock holes are coincided with the center of the outer cylinder at the upper part of the lock core pulling sleeve. Although the arc diameter of the arcs at the two ends of each lock chip is the same as the diameter of the outer cylinder of the lock cylinder pulling sleeve, because of non-concentricity, one end of each lock chip extends out of the gap of the lock cylinder pulling sleeve and enters the groove on the left or right of the lock cylinder hole of the upper lock shell, and the length of the extending groove is d, so that the lock chip is in a door locking state, and the lock cylinder pulling sleeve can not rotate freely in the upper lock shell. When the lock is unlocked, the key is inserted into the keyhole, as shown in fig. 15 to 17, and the cross sections of the key at different depth positions correspond to the lock chip at different depth positions. When the key is inserted and turned by a certain angle, more specifically, as shown in fig. 18 to 20, after the cross-section of each position with different depth of the key is turned by a positive angle a ° -b °, the cross-section of each position with different depth of the key drives the wafer with different depth of the key to move to the left or to the right by different distances d, which can be derived geometrically, and the distance d has a definite relationship with the corresponding eccentricity e of the cross-section of the key with different depth of the key, and the relationship is:

therefore, when the lock is unlocked, after the key rotates forwards by a-b degrees, the key pushes the lock chip at different depth positions by a certain distance d leftwards or rightwards by utilizing different eccentricities e of the cross sections at different depth positions, and enables the upper and lower parallel inclined edges of the cross sections of the key at different depth positions to rotate by an angle of a-b degrees and then to coincide with the left and right parallel edges of the special-shaped lock hole of the lock chip, so that the lock chip and the lock chip are integrated into a whole to form a whole, thereby ensuring that the circle centers of arcs at two ends of the lock chip at different depth positions are coincident with the center of the outer cylinder at the upper part of the lock core pulling sleeve, at the moment, all the lock chips can not extend out of a gap of the lock core pulling sleeve, and the key can drive the lock core pulling.

When the door is locked, the cross sections of the keys at different depth positions rotate reversely, the upper and lower parallel bevel edges of the cross sections are separated from the left and right parallel edges of the special-shaped lock hole of the lock core piece, the left and right vertical edges in the cross sections of the keys opposite to the upper and lower parallel bevel edges drive the lock core piece to rotate reversely so as to drive the lock core pulling sleeve to rotate reversely, the lock is locked when the lock key rotates reversely for a certain angle to drive the lock core pulling sleeve to rotate for a certain angle to align the left and right notches of the upper cylinder of the lock core pulling sleeve with the grooves at two sides of the lock core hole of the upper lock shell, the lock continues to rotate the lock key for a small angle, the cross sections at different depth positions push the lock core pieces at different depth positions to extend into the left and right inner grooves of the lock core hole by utilizing the eccentricity e of the lock key, at the same time, the key and the lock core pulling sleeve at different depth positions cannot rotate reversely, and the special-shaped lock, the key can be pulled out to complete the door locking.

In conclusion, the safe box lock adopts a double-key and double-lock cylinder structure, and greatly improves the anti-theft performance and the confidentiality performance of the safe box lock through the mutual restriction, mutual linkage and lack of the lock tongue and the linkage block. Especially, the requirement that some users need two persons to be on the spot simultaneously to unlock, supervise and balance each other for important documents, precious articles and financial securities can be met. The lock core pulling sleeve I and the lock core pulling sleeve II in the lock are identical in structure, the lock core I and the lock core II are both provided with ten pieces, but the lock core structures are only a few three or four, the size is small, the structure is simple, the material is brass or bronze, the processing and the production are convenient, the assembly is simple, but different arrangement combinations of a few lock cores with simple structures are very many, the non-multiplicity of the lock is greatly improved, and the safety and the reliability are high.

Description of the drawings:

FIG. 1 is a cross-sectional view of the structure of the present invention;

FIG. 2 is a top view of the lock case and key shown in FIG. 1 with the lock case and key removed;

FIG. 3 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 4 is a top view of the device of FIG. 1, after being rekeyed;

FIG. 5 is a schematic plan view of an embodiment 1 of a locking chip;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is a schematic plan view of an embodiment 2 of a chip lock;

FIG. 8 is a cross-sectional view C-C of FIG. 7;

FIG. 9 is a schematic plan view of an embodiment 3 of a locking chip;

FIG. 10 is a cross-sectional view D-D of FIG. 9;

FIG. 11 is a schematic cross-sectional view of the key blank of the key;

FIGS. 12-14 are schematic cross-sectional views of the key after machining at three different depth positions;

FIGS. 15 to 17 are schematic views showing the cross-sections of keys at different depths in cooperation with key chips at different depth positions after the keys are inserted;

fig. 18 to 20 are schematic diagrams illustrating the cross sections of keys with different depths matching with the lock chip at different depth positions after the key is turned for an angle during unlocking;

fig. 21 is a perspective view of the key.

Description of the reference numerals

1-a key I, 2-a key II, 3-a lower lock shell, 4-a upper lock shell, 5-a lock head cover, 6-a bolt, 7-a lock cylinder pull sleeve I, 8-a linkage block, 9-a lock chip I, 10-a lock chip small round pad, 11-a large round pad, 12-a snap ring, 13-a top spring, 14-a linkage block pressure spring, 15-a lock cylinder pull sleeve II, 16-a lock chip II, 17-a special-shaped lock hole, 18-an eccentric cylinder platform, 19-a limiting block, 20-a kidney-shaped hole, 21-a groove, 22-an upper and lower lock shell fastening screw, 23-a shaft column, 24-a lock cylinder hole I, 25-a lock cylinder hole II, 26-a central symmetry point of a special-shaped lock, 27-two end arcs of the lock chip, 28-centers of two arcs of two ends of the lock chip, 29-a key rotation center and 30-an upper excircle of the lock cylinder.

The specific implementation mode is as follows:

referring to fig. 1 to 21, the double-key linkage safe deposit box lock comprises an upper lock shell, a lower lock shell, a first key and a second key, wherein a spring bolt and a linkage block are installed in the lower lock shell, the rear end of the spring bolt is positioned at the front end of the linkage block, the spring bolt and the linkage block are in clearance fit, a first lock cylinder pulling sleeve and a second lock cylinder pulling sleeve are installed in the upper lock shell, the first lock cylinder pulling sleeve is positioned above the spring bolt, the bottom end of the first lock cylinder pulling sleeve is in linkage with the spring bolt in a matching way, the second lock cylinder pulling sleeve is positioned above the linkage block, and the bottom ends of the second lock cylinder pulling sleeve are in linkage with; the lock core pulling sleeve I is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces I matched with the key I which are sequentially connected, and the lock core pulling sleeve II is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces II matched with the key II which are sequentially connected.

The bottom end of the lock cylinder pulling sleeve is provided with an eccentric cylindrical table, the eccentric cylindrical table corresponds to the lock cylinder pulling sleeve, the lock tongue is provided with a kidney-shaped hole, and the eccentric cylindrical table at the bottom end of the lock cylinder pulling sleeve is sleeved into the kidney-shaped hole of the lock tongue to be matched and linked.

One end of the linkage block is provided with a rotating hole, a shaft post is formed on the lower lock shell, the rotating hole of the linkage block is sleeved on the shaft post of the lower lock shell, a linkage block pressure spring is additionally arranged between one end of the linkage block and the shaft post of the lower lock shell, the linkage block pressure spring applies counterclockwise pressure to the linkage block, and a limiting block is formed on the lower lock shell close to the other end of the linkage block; and an eccentric cylindrical table is formed at the bottom end of the second lock cylinder pulling sleeve, and the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve is tightly close to the inner side of the linkage block, so that the linkage block is in linkage with the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve in a matching way.

The bottom of the first lock cylinder pulling sleeve and the bottom of the second lock cylinder pulling sleeve are both disc-shaped bases, the upper portions of the first lock cylinder pulling sleeve and the second lock cylinder pulling sleeve are cylinders with notches formed in the left side and the right side, and the disc-shaped bases are assembled in the upper lock shell through large round pads and clamping rings.

The upper lock shell is respectively provided with a first lock cylinder hole sleeved with a first lock cylinder pulling sleeve and a second lock cylinder hole sleeved with a second lock cylinder pulling sleeve, the inner wall of the first lock cylinder hole is provided with a left groove and a right groove corresponding to the left gap and the right gap of the first lock cylinder pulling sleeve, and the inner wall of the second lock cylinder hole is provided with a left groove and a right groove corresponding to the left gap and the right gap of the second lock cylinder pulling sleeve.

The middle part of the first lock chip is provided with a centrosymmetric special-shaped lock hole, two ends of the first lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the first lock core pull sleeve; two ends of the lock core piece can move in the notches on the left side and the right side of the lock core pulling sleeve I and the left groove and the right groove of the inner wall of the lock core hole I; the middle part of the second lock chip is also provided with a centrosymmetric special-shaped lock hole, two ends of the second lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the second lock core pull sleeve; two ends of the lock core piece II can move in the notches on the left side and the right side of the lock core pulling sleeve II and the left groove and the right groove of the inner wall of the lock core hole II.

The front end of the lower lock shell is provided with a spring bolt outlet, the front end of the spring bolt extends out of or retracts back from the spring bolt outlet, the linkage block is of an arch structure, and the eccentric cylinder at the bottom end of the two lock cylinder pulling sleeves is positioned at the inner side of the arch structure which is close to the linkage block.

The first lock chip or the second lock chip is designed into a special-shaped long strip, and the thickness of the middle part is smaller than that of the two end parts; the lock chip is provided with a special-shaped lock hole with a symmetrical center, the left side and the right side of the special-shaped lock hole are provided with a section of parallel sides, the distance between the sections of parallel sides is L, and an eccentric distance d is arranged between the central symmetry point of the special-shaped lock hole and the circle centers of arcs at the two ends of the lock chip.

The cross section of the key blank of the key I or the key II is a special-shaped strip section with two flat ends and a convex circular arc in the middle; the different depth positions of the key I or the key II correspond to different lock cylinders, two sides of the cross section of the key I or the key II at the different depth positions are processed into two parallel bevel edges which are parallel to each other, the distance between the two parallel bevel edges is L, the two parallel bevel edges form an angle of a degrees with the vertical center line of the key, and a certain distance e is reserved between the center line of the two parallel edges and the center point of the key.

The top of the lock cylinder hole I and the top of the lock cylinder hole II of the upper lock shell are also covered with a lock head cover, and the lock head cover is provided with a key hole.

Claims (10)

1. A double-key linkage safe deposit box lock is characterized in that: the lock comprises an upper lock shell, a lower lock shell, a first key and a second key, wherein a lock tongue and a linkage block are installed in the lower lock shell, the rear end of the lock tongue is positioned at the front end of the linkage block, the lock tongue retreats to unlock and is controlled by the linkage block, a first lock cylinder pulling sleeve and a second lock cylinder pulling sleeve are installed in the upper lock shell, the first lock cylinder pulling sleeve is positioned above the lock tongue, an eccentric cylindrical table at the bottom end of the first lock cylinder pulling sleeve is matched and linked with the lock tongue, the second lock cylinder pulling sleeve is positioned above the linkage block, and an eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve is matched; the lock core pulling sleeve I is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces I matched with the key I which are sequentially connected, and the lock core pulling sleeve II is internally provided with a top spring, a lock core piece small round pad and a plurality of lock core pieces II matched with the key II which are sequentially connected.

2. The double-key linked safe deposit box lock according to claim 1, wherein: the bottom end of the lock cylinder pulling sleeve is provided with an eccentric cylindrical table, the eccentric cylindrical table corresponds to the lock cylinder pulling sleeve, the lock tongue is provided with a kidney-shaped hole, and the eccentric cylindrical table at the bottom end of the lock cylinder pulling sleeve is sleeved into the kidney-shaped hole of the lock tongue to be matched and linked.

3. The double-key linked safe deposit box lock according to claim 1, wherein: one end of the linkage block is provided with a rotating hole, a shaft post is formed on the lower lock shell, the rotating hole of the linkage block is sleeved on the shaft post of the lower lock shell, a linkage block pressure spring is additionally arranged between one end of the linkage block and the shaft post of the lower lock shell, the linkage block pressure spring applies counterclockwise pressure to the linkage block, and a limiting block is formed on the lower lock shell close to the other end of the linkage block; and an eccentric cylindrical table is formed at the bottom end of the second lock cylinder pulling sleeve, and the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve is tightly close to the inner side of the linkage block, so that the linkage block is in linkage with the eccentric cylindrical table at the bottom end of the second lock cylinder pulling sleeve in a matching way.

4. The double-key linked safe deposit box lock according to claim 1, wherein: the bottom of the first lock cylinder pulling sleeve and the bottom of the second lock cylinder pulling sleeve are both disc-shaped bases, the upper portions of the first lock cylinder pulling sleeve and the second lock cylinder pulling sleeve are cylinders with notches formed in the left side and the right side, and the disc-shaped bases are assembled in the upper lock shell through large round pads and clamping rings.

5. The double-key linked safe deposit box lock according to claim 1, wherein: the upper lock shell is respectively provided with a first lock cylinder hole sleeved with a first lock cylinder pulling sleeve and a second lock cylinder hole sleeved with a second lock cylinder pulling sleeve, the inner wall of the first lock cylinder hole is provided with a left groove and a right groove corresponding to the left gap and the right gap of the first lock cylinder pulling sleeve, and the inner wall of the second lock cylinder hole is provided with a left groove and a right groove corresponding to the left gap and the right gap of the second lock cylinder pulling sleeve.

6. The double-key linked safe deposit box lock according to claim 1, wherein: the middle part of the first lock chip is provided with a special-shaped lock hole with a central symmetry point, two ends of the first lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the first lock cylinder pull sleeve; two ends of the lock core piece can move in the notches on the left side and the right side of the lock core pulling sleeve I and the left groove and the right groove of the inner wall of the lock core hole I; the middle part of the second lock chip is also provided with a special-shaped lock hole with a central symmetry point, two ends of the second lock chip are concentric circular arcs, and the diameter of the concentric circular arcs is equal to the outer diameter of the upper part of the second lock core pull sleeve; two ends of the lock core piece II can move in the notches on the left side and the right side of the lock core pulling sleeve II and the left groove and the right groove of the inner wall of the lock core hole II.

7. The double-key linked safe deposit box lock according to claim 1, wherein: the front end of the lower lock shell is provided with a bolt outlet hole, the front end of the bolt extends out of or retracts back from the bolt outlet hole, the linkage block is of an arch structure, and the eccentric cylinder at the bottom end of the lock cylinder pulling sleeve is positioned at and tightly leans against the inner side of the arch structure of the linkage block.

8. The double-key linked safe deposit box lock according to claim 1, wherein: the first lock chip or the second lock chip is designed into a special-shaped long strip, and the thickness of the middle part is smaller than that of the two end parts; the lock chip is provided with a special-shaped lock hole with a central symmetry point in the middle, the left side and the right side of the special-shaped lock hole are provided with a section of mutually parallel sides, an eccentric distance is reserved between the central symmetry point of the special-shaped lock hole and the circle center of the circular arcs at the two ends of the lock chip, and different eccentric values correspond to different lock chips.

9. The double-key linked safe deposit box lock according to claim 1, wherein: the cross section of the key blank of the key I or the key II is a special-shaped strip section with two flat ends and a convex circular arc in the middle; the different depth positions of the key I or the key II correspond to different lock cylinders, two sides of the cross section of the different depth positions of the key I or the key II are processed into two parallel bevel edges which are parallel to each other, the distance between the two parallel bevel edges is L, the two parallel bevel edges and the vertical center line of the key form an angle of a degree, an eccentric distance e is arranged between the center line of the two parallel edges and the rotation center point of the key, and the eccentric distances of the different depth positions of the key are different.

10. A method for designing a lock chip of a double-key-linked safe deposit box lock according to claim 1, wherein: each lock chip is provided with a special-shaped lock hole, and the size and the shape of the special-shaped lock hole of each lock chip are the same; the special-shaped lock holes of each lock chip are designed into symmetrical patterns with central symmetrical points;

the special-shaped lock holes of each lock chip are provided with two parallel bevel edges which are centrosymmetric, and the distance between the parallel bevel edges is L; the two parallel edges are inclined at an angle b relative to the vertical center line of the lock chip;

the two ends of each lock chip are circular arcs which are concentric, and the diameters of the circular arcs at the two ends of each lock chip are equal;

different offset distances d are arranged between the central symmetry point of the two parallel bevel edges of different lock chips and the concentric circle centers of the circular arcs at the two ends.

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