A lock mechanism of a combination of a padlock and a lock box

Abstract

The present application belongs to the technical field of intelligent lock, and provides a lock mechanism of padlock and lock box integration, which comprises a lock box, a padlock assembly, a lock box locking assembly and an electric control assembly. The lock box comprises a lock box body and a lock box cover, the lock box body is connected with the lock box cover, the lock box cover covers the lock box body to form a storage space, and the storage space is exposed after the lock box cover is opened from the lock box body; the padlock assembly is assembled at one end of the lock box cover to lock or open the lock box and a fixed body; the lock box locking assembly is assembled at one end of the lock box cover and comprises a spring front locking tongue mechanism, a motor and a double eccentric gear rack transmission mechanism; the electric control assembly comprises a signal input module and a main control board, the main control board is connected with the signal input module and the motor through electric signals, the motor is driven to move the double eccentric gear rack transmission mechanism to drive the spring front locking tongue mechanism to enter or exit the recess of the lock box cover, so that the lock box cover is opened or closed. The lock mechanism can improve the safety performance against accidental unlocking and reduce the risk of motor jam.

Description

Technical Field

[0001] This invention belongs to the field of intelligent lock technology, and in particular relates to a lock mechanism that integrates a padlock and a lock box. Background Technology

[0002] Typically, padlocks and security boxes are two distinct products, serving the functions of padlocking and secure storage, respectively. They are used independently in their respective application scenarios. When users need to use both padlocks and security storage simultaneously, a single padlock or security box cannot meet their needs. Therefore, existing technologies have proposed various integrated padlock and security box solutions to create a smart lock that combines the functions of both. This type of integrated smart lock can function as a padlock in situations where only padlocks are suitable, and also as a miniature security box to store items. However, a common problem with this type of integrated smart lock is that it is prone to accidental unlocking upon impact, posing a security risk. Furthermore, it is susceptible to motor jamming, and the lock body has poor waterproofing.

[0003] In summary, existing integrated smart locks have technical problems such as being prone to accidental unlocking when impacted, posing security risks, easily causing motor jamming, and having poor waterproof performance.

[0004] Application content

[0005] To address the shortcomings of the existing technology, this invention provides a lock mechanism that integrates a padlock and a lock box, thereby improving security against accidental unlocking, enhancing the waterproof performance of the lock body, and reducing the risk of motor jamming.

[0006] A padlock and lock box integrated locking mechanism, comprising:

[0007] A lock box includes a lock box body and a lock box cover; the lock box body is connected to the lock box cover, and the lock box cover covers the lock box body to form a storage space; the lock box cover is opened from the lock box body to reveal the storage space;

[0008] A padlock assembly is fitted to one end of the lock box cover to lock or open the lock box to the fixing body.

[0009] A lock box locking assembly, assembled at one end of the lock box cover, includes a spring-loaded front locking tongue mechanism, a motor, and a double eccentric wheel rack and pinion transmission mechanism, wherein the double eccentric wheel rack and pinion transmission mechanism connects the motor and the spring-loaded front locking tongue mechanism;

[0010] An electronic control assembly includes a signal input module and a main control board. The signal input module is mounted on the outside of the lock box body, and the main control board is mounted inside the lock box body. The main control board is connected to the signal input module and the motor via electrical signals, and controls the motor to drive the double eccentric wheel rack and pinion transmission mechanism to move, so as to drive the spring-loaded front locking tongue mechanism to move in and out of the recess of the lock box cover, so as to open or close the lock box cover.

[0011] Furthermore, the signal input module includes a fingerprint recognition module. After the fingerprint recognition module recognizes the user's fingerprint, it transmits the fingerprint to the main control board. The main control board sends an open cover signal based on the valid fingerprint to control the motor to drive the double eccentric wheel rack and pinion transmission mechanism to move.

[0012] Furthermore, the signal input module includes a button module. After the button module recognizes a button signal, it transmits it to the main control board. The main control board sends an open cover signal based on the valid button signal to control the motor to drive the double eccentric wheel rack and pinion transmission mechanism to move.

[0013] Furthermore, the padlock assembly includes a hook mechanism and a ball-stopping mechanism; the ball-stopping mechanism is located on one side of the hook mechanism and is used to limit the hook mechanism to lock or release the limit on the hook mechanism to unlock.

[0014] Furthermore, the locking mechanism includes a U-shaped locking hook, a locking hook spring, and a locking hook fixing cover; the locking hook fixing cover is connected to one end of the U-shaped locking hook, and the other end of the U-shaped locking hook is fixed to the lock box cover; the locking hook spring is located on one side of the locking hook fixing cover and is connected to the U-shaped locking hook.

[0015] Furthermore, the steel ball limiting mechanism includes a steel ball, a steel ball pressure plate, and a steel ball pressure plate retaining spring; the steel ball is located at one end of the steel ball pressure plate, and the steel ball pressure plate is connected to the steel ball pressure plate retaining spring, which drives the steel ball to move; when the locking hook mechanism receives the locking pressure force, the steel ball extends and enters the limiting groove of the U-shaped locking hook to lock; when the U-shaped locking hook unlocks, it compresses the steel ball and the steel ball pressure plate to retract, compresses the steel ball pressure plate retaining spring, and the limiting groove of the U-shaped locking hook disengages from the steel ball.

[0016] Furthermore, the spring-loaded front locking tongue mechanism includes a locking tongue and a front locking tongue spring; the front locking tongue spring is sleeved on the front end of the locking tongue; one end of the double eccentric wheel rack and pinion transmission mechanism is connected to the front locking tongue spring, and the other end of the double eccentric wheel rack and pinion transmission mechanism is connected to the motor; when locked, the front locking tongue spring drives the locking tongue to move under the drive of the double eccentric wheel rack and pinion transmission mechanism.

[0017] Furthermore, a waterproof gasket is provided inside the lock box. When locking, the front spring of the lock tongue drives the rear end of the lock tongue to move toward the position of the waterproof gasket under the drive of the double eccentric wheel rack and pinion transmission mechanism, thus squeezing the waterproof gasket.

[0018] Furthermore, the double eccentric wheel rack transmission mechanism includes a double eccentric wheel and a rack. The double eccentric wheel is connected to the torque output end of the motor and the far locking tongue end of the rack, and the near locking tongue end of the rack is connected to the locking tongue front spring.

[0019] Furthermore, the end of the rack near the latch is connected to the latch front spring via an E-shaped buckle, and the E-shaped buckle is fitted to the front end of the latch.

[0020] Furthermore, an inner groove is provided on the inner side of the lock box cover. When the lock box cover covers the lock box body, the inner groove is opposite to the interior of the lock box body to form the storage space.

[0021] Compared with the prior art, the beneficial effects of this invention are as follows:

[0022] The present invention provides a padlock and lock box integrated locking mechanism, including a lock box, a padlock assembly, a lock box locking assembly, and an electronic control assembly. The lock box includes a lock box body and a lock box cover; the lock box body is connected to the lock box cover, and the lock box cover covers the lock box body to form a storage space; the lock box cover opens from the lock box body to reveal the storage space; a padlock assembly is mounted on one end of the lock box cover to lock or open the lock box to a fixed body; a lock box locking assembly is mounted on one end of the lock box cover and includes a spring-loaded front locking tongue mechanism, a motor, and a double eccentric wheel rack and pinion transmission mechanism, the double eccentric wheel rack and pinion transmission mechanism connecting the motor and the spring-loaded front locking tongue mechanism; the electronic control assembly includes a signal input module and a main control board, the signal input module is mounted on the outside of the lock box body, and the main control board is mounted inside the lock box body; the main control board is electrically connected to the signal input module and the motor, controlling the motor to drive the double eccentric wheel rack and pinion transmission mechanism to move, thereby causing the spring-loaded front locking tongue mechanism to move in and out of the recess of the lock box cover, thus opening or closing the lock box cover. This locking mechanism can improve security against accidental unlocking and reduce the risk of motor jamming. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. Some specific embodiments of the invention will be described in detail below with reference to the accompanying drawings in an exemplary and non-limiting manner. The same reference numerals in the drawings designate the same or similar parts or components. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0024] Figure 1 This is a cross-sectional structural schematic diagram of a lock mechanism integrating a padlock and lock box according to an embodiment of the present invention;

[0025] Figure 2 This is another cross-sectional structural schematic diagram of the integrated padlock and lock box locking mechanism according to an embodiment of the present invention;

[0026] Figure 3 This is another cross-sectional structural schematic diagram of the integrated padlock and lock box locking mechanism according to an embodiment of the present invention;

[0027] Figure 4 This is another cross-sectional structural schematic diagram of the integrated padlock and lock box locking mechanism according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of a structure of a double eccentric wheel and rack according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of another structure of the double eccentric wheel and rack according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of an assembly structure of a padlock and lock box integrated lock mechanism according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Lock box; 10. Lock box body; 11. Lock box cover;

[0033] 2. Padlock assembly; 20. Hook mechanism; 200. U-shaped hook; 201. Hook spring; 202. Hook fixing cover; 21. Steel ball limiting mechanism; 210. Steel ball; 211. Steel ball pressure plate; 212. Steel ball pressure plate retaining spring;

[0034] 3. Lock box locking assembly; 30. Spring-loaded front lock tongue mechanism; 300. Lock tongue; 301. Lock tongue front spring; 31. Motor; 32. Double eccentric wheel rack and pinion transmission mechanism; 320. Double eccentric wheel; 321. Rack; 322. E-shaped buckle;

[0035] 40. Signal input module; 41. Main control board;

[0036] 5. Waterproof rubber mat. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0038] See Figures 1-7 This invention provides an integrated padlock and lock box mechanism, comprising a lock box 1, a padlock assembly 2, a lock box locking assembly 3, and an electronic control assembly. The lock box 1 includes a lock box body 10 and a lock box cover 11; the lock box body 10 is connected to the lock box cover 11, and the lock box cover 11 covers the lock box body 10, forming a storage space; the lock box cover 11 opens from the lock box body 10 to reveal the storage space; the padlock assembly 2 is mounted on one end of the lock box cover 11, locking or unlocking the lock box 1 to a fixed body; the lock box locking assembly 3 is mounted on one end of the lock box cover 11 and includes a spring-loaded front latch mechanism 30, a motor 31, and a double eccentric gear rack transmission mechanism 32. The motor 31 and the spring-loaded front locking tongue mechanism 30 are connected; the electronic control component includes a signal input module 40 and a main control board 41. The signal input module 40 is mounted on the outside of the lock box body 10, and the main control board 41 is mounted inside the lock box body 10. The main control board 41 is connected to the signal input module 40 and the motor 31 via electrical signals, and controls the motor 31 to drive the double eccentric wheel rack and pinion transmission mechanism 32 to move, so as to drive the spring-loaded front locking tongue mechanism 30 to move in and out of the recess of the lock box cover 11, so that the lock box cover 11 is opened or closed.

[0039] It should be noted that in this embodiment, the spring-loaded front latch mechanism 30 can improve the overall anti-pry level of the lock. When an external force strikes or impacts the lock body, the vector direction of the impact force must be parallel to the spring extension direction for the latch 300 to move. Simultaneously, the energy of the impact must completely equal the spring's deformation displacement to cause accidental unlocking. If either condition is missing, accidental unlocking will not occur, thus greatly improving the security of the lock mechanism. It is important to note that in this embodiment, the spring-loaded front latch mechanism 30 is not directly connected to the motor 31, but rather through a double eccentric wheel rack and pinion transmission mechanism 32. Therefore, the transmission stroke is longer, and compared to a single eccentric wheel transmission, the stroke avoids the diameter constraint of a single eccentric wheel, resulting in stable and smooth transmission and a higher security level for the latch 300. Understandably, when the single eccentric wheel reaches its maximum travel distance, the motor 31 will restart under maximum load, making it prone to jamming. Furthermore, the starting torque of the motor 31 must equal the maximum stall torque, placing high demands on the motor and increasing costs. In this embodiment, however, the double eccentric wheel rack and pinion transmission mechanism 32 does not have this problem of starting under maximum load.

[0040] It should be noted that the inner side of the lock box cover 11 may be provided with an inner groove. When the lock box cover 11 covers the lock box body 10, the inner groove is opposite to the interior of the lock box body 10 to form the storage space.

[0041] In some preferred embodiments, the signal input module 40 may include a fingerprint recognition module. After recognizing a user's fingerprint, the fingerprint recognition module transmits the information to the main control board 41. The main control board 41 then sends an open-cover signal based on a valid fingerprint to control the motor 31 to drive the double eccentric rack and pinion transmission mechanism 32 to move. Alternatively, the signal input module 40 may include a button module. After recognizing a button signal, the button module transmits the information to the main control board 41. The main control board 41 then sends an open-cover signal based on a valid button signal to control the motor 31 to drive the double eccentric rack and pinion transmission mechanism 32 to move.

[0042] It should be noted that the signal input module 40 may include a fingerprint recognition module alone, a button module alone, or both. When the signal input module 40 includes both a fingerprint recognition module and a button module, the fingerprint recognition module may be located above or below the button module. Furthermore, the user input interfaces for both the fingerprint recognition module and the button module are located on the surface of the lock box body 10.

[0043] In some preferred embodiments, the padlock assembly 2 includes a hook mechanism 20 and a ball-limiting mechanism 21. The ball-limiting mechanism 21 is located on one side of the hook mechanism 20 and is used to limit the hook mechanism 20 to lock or release the limit to unlock. The hook mechanism 20 may include a U-shaped hook 200, a hook spring 201, and a hook fixing cover 202. The hook fixing cover 202 is connected to one end of the U-shaped hook 200, and the other end of the U-shaped hook 200 is fixed to the lock box cover 11. The hook spring 201 is located on one side of the hook fixing cover 202 and connected to the U-shaped hook 200. The ball limiting mechanism 21 may include a ball 210, a ball pressure plate 211, and a ball pressure plate retaining spring 212. The ball 210 is located at one end of the ball pressure plate 211, and the ball pressure plate 211 is connected to the ball pressure plate retaining spring 212, which drives the ball 210 to move. When the locking hook mechanism 20 receives the locking pressure, the ball 210 extends and enters the limiting groove of the U-shaped locking hook 200 to lock. When the U-shaped locking hook 200 unlocks, it compresses the ball 210 and the ball pressure plate 211 to retract, compresses the ball pressure plate retaining spring 212, and the limiting groove of the U-shaped locking hook 200 disengages from the ball 210.

[0044] It should be noted that the steel ball limiting mechanism 21 limits the locking hook mechanism 20 to achieve locking, or releases the limiting of the locking hook mechanism 20 to achieve unlocking. Since the locking hook mechanism 20 locks or opens the lock box 1 to the fixed body, for example, locks or opens the lock box 1 to the door bolt or other objects that need to be locked, it achieves security control of the lock box 1. The locking hook mechanism 20 may include a U-shaped locking hook 200, and the U-shaped locking hook 200 may be provided with a limiting groove. The limiting groove is used to cooperate with the steel ball 210, the steel ball pressure plate 211, and the steel ball pressure plate holding spring 212 in the steel ball limiting mechanism 21 to achieve limiting or releasing the limiting.

[0045] In some preferred embodiments, the spring-loaded front locking tongue mechanism 30 includes a locking tongue 300 and a front locking tongue spring 301; the front locking tongue spring 301 is sleeved on the front end of the locking tongue 300; one end of the double eccentric wheel rack and pinion transmission mechanism 32 is connected to the front locking tongue spring 301, and the other end of the double eccentric wheel rack and pinion transmission mechanism 32 is connected to the motor 31; when locked, the front locking tongue spring 301 drives the locking tongue 300 to move under the drive of the double eccentric wheel rack and pinion transmission mechanism 32.

[0046] It should be noted that in this embodiment, since the front spring 301 of the latch is sleeved on the front end of the latch 300, one end of the double eccentric gear rack transmission mechanism 32 is connected to the front spring 301 of the latch, and the other end of the double eccentric gear rack transmission mechanism 32 is connected to the motor 31, the front spring 301 of the latch drives the latch 300 to move under the drive of the double eccentric gear rack transmission mechanism 32 when locking. Therefore, the front spring 301 of the latch and the latch 300 are not directly connected to the motor 31, but are connected to the motor 31 through the double eccentric gear rack transmission mechanism 32. This can improve the anti-pry level of the entire lock. When an external force strikes or impacts the lock body, the vector direction of the impact force must be parallel to the extension and contraction direction of the spring in order to cause the latch 300 to move. At the same time, the energy of the impact must completely make the deformation displacement of the spring equal to the unlocking stroke of the latch 300 in order to cause accidental unlocking. If either of these two conditions is missing, there will be no accidental unlocking, thereby greatly improving the security of the lock mechanism.

[0047] In some improved embodiments, a waterproof gasket 5 is provided inside the lock box 1. When locking, the front spring 301 of the lock tongue drives the rear end of the lock tongue 300 to move toward the position of the waterproof gasket 5 under the drive of the double eccentric wheel rack and pinion transmission mechanism 32, thus squeezing the waterproof gasket 5.

[0048] It should be noted that in this embodiment, the front spring 301 and the latch 300 are not directly connected to the motor 31, but are connected to the motor 31 through a double eccentric rack and pinion transmission mechanism 32. This improves the overall anti-pry level of the lock and enhances the security of the lock mechanism. When locking, the double eccentric rack and pinion transmission mechanism 32 drives the rear end of the latch 300 to move towards the waterproof gasket 5, compressing the waterproof gasket 5. When locking, the front spring 301, which is fitted onto the latch, presses the rear end of the latch 300 against the waterproof gasket 5, providing waterproof protection for the lock mechanism. If rainwater sprays, the water pressure must be greater than the energy that causes the spring to displace before the water can penetrate the protection of the waterproof gasket 5, thus ensuring the IPX66 waterproof rating of the lock mechanism.

[0049] In some preferred embodiments, the double eccentric wheel and rack transmission mechanism 32 includes a double eccentric wheel 320 and a rack 321. The double eccentric wheel 320 connects the torque output end of the motor 31 to the far end of the locking tongue 300 of the rack 321, and the near end of the locking tongue 300 rack 321 is connected to the locking tongue front spring 301. The near end of the locking tongue 300 rack 321 can be connected to the locking tongue front spring 301 via an E-shaped buckle 322, which is fitted onto the front end of the locking tongue 300.

[0050] It should be noted that in this embodiment, since the double eccentric wheel 320 connects the torque output end of the motor 31 and the far end of the rack 321 (lock tongue 300), and the near end of the rack 321 (lock tongue 300) connects to the front spring 301, the spring-front locking tongue mechanism 30 is not directly connected to the motor 31. The double eccentric wheel rack transmission mechanism 32 has a longer transmission stroke. Compared to the single eccentric wheel transmission, the stroke avoids the diameter constraint of the single eccentric wheel, resulting in stable and smooth transmission and a higher safety level for the lock tongue 300. It is understandable that when the single eccentric wheel reaches its maximum stroke distance, the motor 31 will start under maximum load, making it prone to jamming. Furthermore, the starting torque of the motor 31 must equal the maximum stall torque, placing high demands on the motor and increasing costs. In this embodiment, the double eccentric wheel rack transmission mechanism 32 does not have the problem of starting under maximum load.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lock mechanism integrating a padlock and lock box, characterized in that, The application relates to a lock box. The lock box comprises a lock box body and a lock box cover; the lock box body is connected with the lock box cover, the lock box cover covers the lock box body to form a storage space, and the lock box cover exposes the storage space after being opened from the lock box body. A padlock assembly is arranged at one end of the lock box cover to lock or open the lock box and a fixed body. A lock box locking assembly is arranged at one end of the lock box cover and comprises a spring pre-arranged lock tongue mechanism, a motor and a double eccentric wheel rack transmission mechanism; the double eccentric wheel rack transmission mechanism is connected with the motor and the spring pre-arranged lock tongue mechanism. An electric control assembly comprises a signal input module and a main control board; the signal input module is arranged outside the lock box body, and the main control board is arranged in the lock box body; the main control board is connected with the signal input module and the motor through electric signals to control the motor to drive the double eccentric wheel rack transmission mechanism to move, so that the spring pre-arranged lock tongue mechanism is driven into or out of the recess of the lock box cover to open or close the lock box cover. The spring pre-arranged lock tongue mechanism comprises a lock tongue and a lock tongue pre-arranged spring. The lock tongue pre-arranged spring is sleeved at the front end of the lock tongue. One end of the double eccentric wheel rack transmission mechanism is connected with the lock tongue pre-arranged spring, and the other end of the double eccentric wheel rack transmission mechanism is connected with the motor; the lock tongue pre-arranged spring is driven by the double eccentric wheel rack transmission mechanism to move when locking; the double eccentric wheel rack transmission mechanism comprises a double eccentric wheel and a rack; the double eccentric wheel is connected with the torque output end of the motor and the far lock tongue end of the rack; the near lock tongue end of the rack is connected with the lock tongue pre-arranged spring; the near lock tongue end of the rack is connected with the lock tongue pre-arranged spring through an E-shaped buckle; the E-shaped buckle is arranged at the front end of the lock tongue. The inside of the lock box is provided with a waterproof rubber pad; the rear end of the lock tongue is driven by the double eccentric wheel rack transmission mechanism to move towards the position of the waterproof rubber pad and press the waterproof rubber pad when locking.

2. The combination lock and lockbox lock mechanism of claim 1, wherein, The signal input module comprises a fingerprint identification module; the fingerprint identification module transmits a legal fingerprint to the main control board after identifying the fingerprint; the main control board sends an opening signal to control the motor to drive the double eccentric wheel rack transmission mechanism to move according to the legal fingerprint.

3. The combination lock and lockbox lock mechanism of claim 1, wherein, The signal input module comprises a key module; the key module transmits a legal key signal to the main control board after identifying the key signal; the main control board sends an opening signal to control the motor to drive the double eccentric wheel rack transmission mechanism to move according to the legal key signal.

4. The combination lock and lockbox lock mechanism of claim 1, wherein, The padlock assembly comprises a lock hook mechanism and a steel ball limiting mechanism; the steel ball limiting mechanism is arranged at one side of the lock hook mechanism and is used for limiting the lock hook mechanism to realize locking or releasing the limitation of the lock hook mechanism to realize unlocking.

5. The combination lock and lockbox lock mechanism of claim 4, wherein: The lock hook mechanism comprises a U-shaped lock hook, a lock hook spring and a lock hook fixing cover; one end of the lock hook fixing cover is connected with the U-shaped lock hook, the other end of the U-shaped lock hook is fixed with the lock box cover, and the lock hook spring is arranged at one side of the lock hook fixing cover and connected with the U-shaped lock hook.

6. The combination padlock and lockbox lock mechanism of claim 5, wherein: The steel ball limiting mechanism comprises a steel ball, a steel ball pressing plate and a steel ball pressing plate retaining spring; the steel ball is located at one end of the steel ball pressing plate, the steel ball pressing plate is connected with the steel ball pressing plate retaining spring to drive the steel ball to move; when the lock hook mechanism receives a locking pressing force, the steel ball extends into the limiting groove of the U-shaped lock hook to be locked; when the U-shaped lock hook is unlocked, the steel ball and the steel ball pressing plate are compressed to retract, the steel ball pressing plate retaining spring is compressed, and the limiting groove of the U-shaped lock hook is separated from the steel ball.

7. The combination lock mechanism of any one of claims 1-6, wherein the shackle is a cylindrical shackle. An inner groove is arranged on the inner side of the lock box cover, and the inner groove is opposite to the inside of the lock box body to form the storage space when the lock box cover covers the lock box body.

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