Lock cylinder mechanism
The lock cylinder mechanism addresses liquid infiltration issues by using a hermetically fitted sealing pad and protective shroud, along with a pusher element and limiting pins, to maintain drive connection stability and prevent destructive lock bypass, ensuring enhanced security.
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- WENZHOU JINFU LOCK LTD
- Filing Date
- 2025-02-27
- Publication Date
- 2026-05-20
AI Technical Summary
Existing lock cylinder mechanisms fail to effectively prevent destructive lock bypass due to liquid infiltration causing the sliding locking pin to freeze, leading to self-lock failure and compromised security.
A lock cylinder mechanism with a sealing pad hermetically fitted between the exterior cylinder body and securing block, secured by a protective shroud to the cylinder spindle, enhances stability and prevents liquid infiltration, and a pusher element with limiting pins to ensure drive connection integrity.
The mechanism effectively blocks liquid infiltration, maintains drive connection stability, and prevents destructive lock bypass, enhancing security by ensuring the lock cylinder remains operational even after compromise.
Smart Images
Figure IMGAF001_ABST
Abstract
Description
FIELD
[0001] The disclosure relates to locks, and more particularly relates to a lock cylinder mechanism.BACKGROUND
[0002] To prevent protection failure of a door lock after its cylinder is destructively compromised, a blocking element, which can actively block a turnpiece of the destructively compromised cylinder from being turned to open, is generally provided in the cylinder of the door lock. For example, the patents CN203939302U and CN205000743U disclose a cylinder structure which comprises a left cylinder body and a right cylinder body that are connected via a connecting lever; a turnpiece is provided between the left cylinder body and the right cylinder body, the turnpiece being in drive connection with a left unlocking lever handle via a left drive block passing through the turnpiece; a linked tab is formed at a front end of the left drive block; a right cylinder spindle is interlinked with a right drive block; a linked snap-in recess is formed at a front end of the right drive block, the linked snap-in recess being fitted with the linked tab; a sliding locking pin is radially, vertically arranged in the turnpiece, one end of the sliding locking pin being connected to a pressure spring, the other end thereof being fitted with the right drive block; an annular groove is arranged on a peripheral surface of the sliding locking pin; two blocking slots are arranged in the turnpiece in a radially upper- lower manner, in each blocking slot being mounted a blocking spring and a blocking pin, the blocking pin being fitted with the annular groove. This cylinder structure may actively limit the turnpiece from being turned to unlock by virtue of movement of the sliding locking pin when the left cylinder body (at the exterior side of the door) is destructively compromised and offers advantages such as a compact structure, a strong anti-theft property, a wide array of applications, and a high reliability. However, in a case of quick-freeze compromising, water or a quick-freezer would infiltrate into the turnpiece, causing the sliding locking pin to be frozen and unable to move outwardly; as the sliding locking pin is immobilized, the annular groove cannot be fitted with the blocking slot so that the blocking element cannot be inserted into the annular groove to perform a blocking function, causing self-lock failure of the turnpiece; consequently, the turnpiece is tunable to unlock the door lock, resulting in anti-theft failure.
[0003] To overcome the above issues, the Chinese Patent CN221298845U describes a solution of arranging, between the securing block and the exterior cylinder body, a sealing pad for sealing the through hole, the exterior drive block passing through the sealing pad in a manner of hermetically fitting therewith, so as to prevent failure of the sliding locking pin due to being frozen at the initial position. However, in that patent literature, the sealing pad is accommodated in an accommodation recess formed on the inner end face of the exterior spindle, and a rigid backing plate is applied to block the sealing pad from migrating out of the accommodation recess; since the rigid backing plate only abuts against the inner end face of the exterior spindle, the stability between the rigid backing plate and the inner end of the exterior cylinder spindle is undesirable, so that the sealing pad likely migrates out of the accommodation recess, affecting sealing effect of the sealing pad.SUMMARY
[0004] A lock cylinder is provided herein, which overcomes an issue that a sealing pad has a deteriorated sealing effect due to poor stability between a rigid backing plate and an exterior cylinder spindle, thereby improving connection stability between a protective shroud and the cylinder spindle so as to enhance the sealing effect of the sealing pad.
[0005] The disclosure describes a technical solution infra: a lock cylinder mechanism, comprising: an interior cylinder body, an exterior cylinder body, and a connecting lever securely connected to both of the interior cylinder body and the exterior cylinder body, the interior cylinder body being provided with an unlocking lever handle, the exterior cylinder body being provided with a cylinder spindle, a turnpiece being arranged between the unlocking lever handle and the cylinder spindle, the unlocking lever handle being provided with an interior drive block, the cylinder spindle being provided with an exterior drive block, the turnpiece being in drive connection respectively with the interior drive block and the exterior drive block, the connecting lever being provided with a securing block, the securing block being provided with a through hole configurable for the exterior drive block to pass through, a sealing pad configurable to seal the through hole being arranged between the securing block and the exterior cylinder body, the exterior drive block passing through the sealing pad in a hermetical fitting manner, wherein a protective shroud is arranged between the exterior cylinder body and the securing block, the protective shroud peripherally envelops the sealing pad, the protective shroud is secured to an inner end of the cylinder spindle to dispose the sealing pad to abut against an inner end face of the cylinder spindle.
[0006] The technical solution noted supra contributes the disclosure the following benefits: by arranging, between the securing block and the exterior cylinder body, the sealing pad which seals the through hole, where the exterior drive block passes through the sealing pad in a manner of hermetically fitting therewith and the sealing pad hermetically covers the through hole, substantial liquid infiltration to the turnpiece rear to the securing block can be effectively blocked, which prevents the exterior drive block and the interior drive block from maintaining drive connection with the turnpiece due to liquid freezing in a case of quick-freeze destructively compromising, further preventing the exterior drive block from being turned by a tool leading to rotation of the turnpiece and destructive lock bypass after the cylinder spindle is destructively compromised; to prevent the sealing pad from migrating from the cylinder spindle affecting sealing effect of the sealing pad, a protective shroud is mounted at an inner end of the cylinder spindle, the protective shroud peripherally enveloping the sealing pad to avoid the excessively squeezed sealing pad from stretching radially outwardly affecting the sealing effect of the sealing pad; by securing the protective shroud to the inner end of the cylinder spindle and disposing the sealing pad to abut against the inner end face of the cylinder spindle, the cylinder spindle would not be detached from the protective shroud causing instability of the sealing pad, which further prevents affecting the sealing effect of the sealing pad; as the secured protective shroud abuts against the sealing pad, the sealing pad squeezed between the cylinder spindle and the protective shroud becomes more conformingly fitted with the outer peripheral wall of the exterior drive block, thereby enhancing sealing effect of the sealing pad; by securing the protective shroud to the inner end of the cylinder spindle, the protective shroud is contributed an enhanced stability, and the sealing pad is also contributed an enhanced stability, whereby sealing effect of the sealing pad is enhanced.
[0007] Furthermore, a limiting portion is provided at an outer side of the protective shroud, and a limiting face is formed at an outer peripheral wall of the inner end of the cylinder spindle, the limiting portion abutting against the limiting face to axially secure the sealing pad.
[0008] With the technical solution noted supra, by securing the protective shroud to the inner end of the cylinder spindle, fitting between the limiting portion and the limiting face of the outer peripheral wall of the cylinder spindle allows for the sealing pad to be axially secured, which enhances stability of the protective shroud in the axial direction of the cylinder spindle and prevents the protective shroud from migrating from the cylinder spindle affecting stability of the sealing pad, further ensuring sealing effect of the sealing pad.
[0009] Furthermore, an internal diameter of the limiting portion is gradually shrunk outwards so that a tapered section that is larger inwards than outwards is formed at an inner sidewall of the limiting portion, the limiting face being fitted with an inner sidewall of the tapered section.
[0010] With the technical solution noted supra, by arranging the internal diameter of the limiting portion to be gradually shrunk outwards so as to form a tapered section and then fitting the limiting face with the inner sidewall of the tapered section, the protective shroud and the sealing pad is driven to move synchronously as the cylinder spindle moves axially, which further enhances connection stability between the protective shroud and the cylinder spindle, thereby preventing the protective shroud from migrating from the cylinder spindle affecting sealing effect of the sealing pad.
[0011] Furthermore, the turnpiece comprises a drive connection portion at its inner end and a socketing portion at its outer end, the interior drive block being in drive connection with the drive connection portion, the exterior drive block projecting into the socketing portion so as to be in drive connection with the interior drive block.
[0012] With the technical solution noted supra, due to drive connection between the interior drive block and the turnpiece via the drive connection portion, when the unlocking lever handle is turned, the interior drive block drives the turnpiece to rotate to thereby lock or unlock the door; the exterior drive block projected in the socketing portion is in drive connection with the interior drive block so that when unlocking with a key, the cylinder spindle is rotated to bring rotation of the exterior drive block, which further drives the interior drive block and the turnpiece to rotate, thereby enhancing rotation stability of the turnpiece driven by the cylinder spindle and the unlocking lever handle, further facilitating a user to lock or unlock the door.
[0013] Furthermore, an outer end of the exterior drive block is in drive connection with the cylinder spindle, an inner end of the exterior drive block is provided with a snap-in recess, an outer end of the interior drive block projects into the snap-in recess so that the interior drive block and the exterior drive block are connected in a transmission manner, and the drive connection portion is provided with a pusher element that is operable to push the exterior drive block after the cylinder spindle is destructively compromised so that the exterior drive block migrates from the interior drive block to prevent destructive lock bypass.
[0014] With the technical solution noted supra, drive connection between the exterior drive block and the interior drive block is enabled via insertion-fitting between the outer end of the interior drive block and the inner end of the exterior drive block; after the cylinder spindle is destructively compromised, since the outer end of the exterior drive block is unblocked, the pusher element on the drive connection portion pushes the exterior drive block outwards, causing the outer end of the interior drive block to migrate from the snap-in recess, so that drive connection between the exterior drive block and the interior drive block is interrupted, which prevents destructive lock bypass when the exterior drive block is turned by a tool.
[0015] Furthermore, the pusher element comprises a first push rod and a first limiting pin, the drive connection portion is formed with a first chamber, the first push rod is disposed slidingly in the first chamber, and the first push rod abuts against the exterior drive block so as to be contributed a tendency of pushing the exterior drive block to slide outwards to migrate from the interior drive block; a first anti-destructive-bypass recess is provided at an outer peripheral wall of an inner end of the first push rod, and the first limiting pin, which is arranged at the drive connection portion, has an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the first limiting pin disposed at the blocked position projecting into the first anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
[0016] With the technical solution noted supra, after the cylinder spindle is destructively compromised, the first push rod pushes the exterior drive block outwards, so that the turnpiece cannot be turned by a tool; to prevent the exterior drive block from being destructively pushed inwards leading to resumption of the drive connection between the interior drive block and the exterior drive block, the pusher element is arranged with a first push rod and a first limiting pin; if the cylinder spindle is uncompromised, the first limiting pin is disposed at the initial position, which does not affect drive connection between the exterior drive block and the interior drive block, so that the turnpiece can be normally turned to lock or unlock the door; after the cylinder spindle is destructively compromised, the first push rod pushes the exterior drive block to slide outwards; after the exterior drive block has migrated from the interior drive block, the first limiting pin changes from the initial position to the blocked position; now, the first limiting pin projects into the first anti-destructive-bypass recess, resulting in detachment between the exterior drive block and the interior drive block; when the exterior drive block is destructively pushed inwards, since the first limiting pin is inserted in the first anti-destructive-bypass recess, the first push rod maintains abutting against the exterior drive block, so that the exterior drive block cannot slide inwards to engage the interior drive block, which prevents unlocking if the turnpiece is destructively pushed, thereby enhancing security performance of the lock cylinder.
[0017] Furthermore, the outer end of the interior drive block is eccentrically arranged with respect to an outer end of the drive connection portion so that an abutting stage is formed at an inner wall of the outer end of the drive connection portion, a second anti-destructive-bypass recess is arranged at an outer peripheral wall of the inner end of the first push rod, a second limiting pin is provided for the abutting stage, and the second limiting pin has an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the second limiting pin disposed at the blocked position projecting into the second anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
[0018] With the technical solution noted supra, since the outer end of the interior drive block is eccentrically arranged with respect to the drive connection portion, a torque is formed between the outer end of the interior drive block and the drive connection portion, which facilitates driving the turnpiece to turn to unlock; in addition, by forming an abutting stage at an inner sidewall of the outer end of the drive connection portion, arranging a second limiting pin on the abutting stage, arranging a second anti-destructive-bypass recess for the first push rod, and disposing the second limiting pin to project in the second anti-destructive-bypass recess, the first limiting pin and the second limiting pin allow for simultaneously locking the first push rod, which further prevents destructive push-induced resumption of the drive connection between the exterior drive block and the interior drive block and thusly further enhances anti-destructive-bypass security of the lock cylinder.
[0019] Furthermore, the drive connection portion is formed with a second chamber, the second chamber being provided with a second push rod abutting against an inner end face of the exterior drive block, the second push rod having a tendency of pushing the interior drive block to abut outwards.
[0020] With the technical solution noted supra, during the process of the exterior drive block sliding outwards, the second push rod pushes the exterior drive block from a position different from the first push rod, which prevents the exterior drive block from being deflected due to one-sided push causing jamming-induced detachment failure between the exterior drive block and the interior drive block during the process of sliding outwards, whereby the anti-destructive-bypass effect of the lock cylinder mechanism is not affected.
[0021] Furthermore, a third anti-destructive-bypass recess is arranged at an outer peripheral wall of an inner end of the second push rod, and a third limiting pin is provided for the drive connection portion, the third limiting pin having an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the third limiting pin disposed at the blocked position projecting into the third anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
[0022] With the technical solution noted supra, after the second push rod assists the first push rod to push the exterior drive block outwards, the third limiting pin projects into the third anti-destructive-bypass recess, whereby the second push rod is locked in the axial direction of the turnpiece, so that the second push rod and the first push rod both abut against the exterior drive block upon destructive compromising, which further enhances anti-destructive-bypass security of the lock cylinder; since the first push rod and the second push rod abut against the exterior drive block simultaneously, the security is further enhanced, which prevents the exterior drive block from being destructively pushed to slide inwards leading to drive connection with the interior drive block.
[0023] Furthermore, the third limiting pin is disposed sliding in a radial direction of the drive connection portion, and a recess is arranged at a side of the third limiting pin facing away from the second push rod, an elastic member projecting into the recess to push the second push rod to abut against the third limiting pin so that the third limiting pin is contributed a tendency of being insertion-fitted into the third anti-destructive-bypass recess.
[0024] With the technical solution noted supra, the elastic member pushes the third limiting pin in a radial direction of the drive connection portion, so that after the second push rod pushes the exterior drive block outwards, the elastic member pushes the third limiting pin so that the third limiting pin projects into the third anti-destructive-bypass recess, which enhances locked stability of the second push rod; by disposing the elastic member to project into the recess, detachment between the elastic member and the third limiting pin is prevented without affecting the anti-destructive-bypass effect of the second push rod.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Hereinafter, the disclosure will be further explained with reference to the accompanying drawings: Fig. 1 is a schematic diagram of a lock cylinder mechanism according to the disclosure; Fig. 2 is an exploded view of the overall mechanism according to the disclosure; Fig. 3 is a sectional view of the overall mechanism of the disclosure; Fig. 4 is an enlarged view of part A in Fig. 3 according to the disclosure; Fig. 5 is an enlarged view of part B in Fig. 3 according to the disclosure; Fig. 6 is a schematic diagram illustrating a first limiting pin, a second limiting pin, and a third limiting pin disposed at blocking positions according to the disclosure; Fig. 7 is a schematic diagram illustrating mounting of the first limiting pin, the second limiting pin, and the third limiting pin according to the disclosure. DETAILED DESCRIPTION OF EMBODIMENTS
[0026] To make the objectives, technical solutions, and advantages of the embodiments of the disclosure more apparent, the technical solutions in the embodiments of the disclosure will be described in a clear and comprehensive manner with reference to the accompanying drawings; it is apparent that the example embodiments described herein are only part of the embodiments of the disclosure, not all of them.
[0027] The terms such as "first" and "second" (if existent) referred to in the specification and claim of the disclosure are used for distinguishing like objects, not necessarily used for describing a specific sequence or priority. Even if a technical feature is modified with "second," it does not necessarily indicate that there surely exists a "first" such feature. It will be understood that the terms "comprise" and "have," as well as any of their variants, intend for a non-exclusive inclusion. It will be understood that in the disclosure, the term "plurality" refers to two or more. The term "and / or" only describes an association relationship between associated objects, which indicates that there may exist three relationships, e.g., X and / or Y may indicate three circumstances: X individually, or both X and Y together, or Y individually. The character " / " generally indicates a relationship of "or" between the former and latter associated objects. The term "comprising X, Y, and Z" or "comprising X, Y, Z" refers to comprising all of X, Y, and Z; the term "comprising X, Y, or Z" refers to comprising one of X, Y, and Z; the term "comprising X, Y and / or Z" refers to comprising any one, or any two, or three of X, Y, and Z.
[0028] Hereinafter, the technical solution of the disclosure will be described in detail through specific implementations. The specific implementations described infra may be combined or interchanged with each other dependent on actual circumstances, and same or similar concepts or processes may be omitted in some implementations.
[0029] As illustrated in Fig. 1, a lock cylinder mechanism according to the disclosure comprises: an interior cylinder body 2, an exterior cylinder body 1, and a connecting lever 3 securely connected to both of the interior cylinder body 2 and the exterior cylinder body 1; as illustrated in Fig. 2, the interior cylinder body 2 is provided with an unlocking lever handle 21, the exterior cylinder body 1 is provided with a cylinder spindle 11, and a turnpiece 4 is arranged between the unlocking lever handle 21 and the cylinder spindle 11; as illustrated in Fig. 3, the unlocking lever handle 21 is provided with an interior drive block 22, the cylinder spindle 11 is provided with an exterior drive block 14, the turnpiece 4 being in drive connection with both of the interior drive block 22 and the exterior drive block 14; the connecting lever 3 is provided with a securing block 31, the securing block 31 being formed with a through hole 311 configurable for the exterior drive block 14 to pass through; and a sealing pad 12 configurable to seal the through hole 311 is arranged between the securing block 31 and the exterior cylinder body 1, the exterior drive block 14 passing through the sealing pad 12 in a hermetical fitting manner.
[0030] In this implementation, to enhance stability and sealing effect of the sealing pad 12, as illustrated in Figs. 3 and 4, a protective shroud 13 is arranged between the exterior cylinder body 1 and the securing block 31, the protective shroud 13 peripherally enveloping the sealing pad 13 to prevent the sealing pad 12, after being squeezed, from stretching excessively outwards in the radial direction affecting the sealing effect of the sealing pad 12 with respect to the through hole 311; the protective shroud 13 is secured to an inner end of the cylinder spindle 11 to dispose the sealing pad 12 to abut against the inner end face of the cylinder spindle 11. By securely mounting the protective shroud 13 to the inner end of the cylinder spindle 11, the protective shroud 13 is prevented from a possibility of migrating from the inner end face of the cylinder spindle 11 affecting the sealing effect of the sealing pad 12. Since the sealing pad 12 disposed abutting is also peripherally enveloped by the protective shroud 13, it will stretch inwardly to become more conformingly fitted with the outer peripheral wall of the exterior drive block 14.
[0031] To enhance stability of the protective shroud 13, as illustrated in Figs. 3 and 4, a limiting portion 131 is arranged at an outer side of the protective shroud 13. In some implementations, an internal diameter of the limiting portion 132 is gradually shrunk outwards so that a tapered section that is larger inwards than outwards is formed at an inner sidewall of the limiting portion 131; a limiting face 111 is formed at the outer peripheral wall of the inner end of the cylinder spindle 11; the inner sidewall of the limiting portion 131 is conformingly fitted with the limiting face 111 to secure the sealing pad 12 in the axial direction, which enhances stability of the secured protective shroud 13 and ensures that the protective shroud 13 abuts against the sealing pad 12, allowing for the sealing pad 12 to seal the through hole 311, further reducing liquid infiltration to the turnpiece 4 and the interior drive block 22 via the through hole 311; otherwise, the interior drive block 22 would be frozen at its initial position leading to destructive lock bypass. This also ensures the sealing effect of the sealing pad 12 and prevents destructive lock bypass. In another implementation, the inner wall of the limiting portion 131 may be formed of a corrugated or serrated shape, so that the limiting face 111 is fitted with the inner peripheral wall of the limiting portion 131 to enhance stability of the secured protective shroud 13, further ensuring stability of the sealing pad 12 to enhance its sealing effect.
[0032] To enhance unlocking smoothness of the lock cylinder mechanism, as illustrated in Figs. 3 and 5, the turnpiece 4 comprises a drive connection portion 41 at its inner end and a socketing portion 42 at its outer end, the interior drive block 22 being in drive connection with the drive connection portion 41, an outer end of the interior drive block 22 extending till the socketing portion 42, the exterior drive block 14 projecting into the socketing portion 42; a snap-in recess 141 is arranged on the inner end face of the exterior drive block 14, the outer end of the interior drive block 22 being inserted in the snap-in recess 141, allowing for the exterior drive block 14 to be in drive connection with the interior drive block 22, so that when a user unlocks from the outside by turning the cylinder spindle 11 with a matched key, the turned cylinder spindle 11 brings the exterior drive block 14 to rotate; since the exterior drive block 14 is in insertion-fitted connection with the interior drive block 22, the interior drive block 22 is brought to rotate, and then the turnpiece 4 is driven to rotate via the drive connection portion 41, whereby the lock is unlocked or locked; when the user unlocks from the inside by turning the unlocking lever handle 21, the interior drive block 22 is brought to rotate, which drives, via the drive connection portion 41, the turnpiece 4 to rotate, whereby the lock is unlocked or locked.
[0033] As illustrated in Figs. 3 and 5, to avoid a circumstance that after the cylinder spindle 11 is destructively compromised, the interior drive block 22 and the exterior drive block 14 still maintain a drive connection leading to destructive lock bypass, the drive connection portion 41 is provided with a pusher element 5 which is configurable to push the exterior drive block 14 after the cylinder spindle 11 is destructively compromised so that the exterior drive block 14 is detached from the interior drive block 22 to prevent destructive lock bypass.
[0034] As illustrated in Figs. 3 through 7, specifically in Fig. 3 and Fig. 5, the pusher element 5 comprises a first push rod 51; the drive connection portion 41 is provided with a first chamber 411 that is eccentrically arranged relative to the interior drive block 22, a lengthwise direction of the first chamber 411 being parallel to an axial direction of the turnpiece 4; the first push rod 51 is disposed slidingly in the first chamber 411; the first push rod 51 abuts against the inner end face of the exterior drive block 14 so as to be contributed a tendency of pushing the exterior drive block 14 to slide outwards to migrate from the interior drive block 22. As illustrated in Fig. 5 and Fig. 6, a first spring 513 is provided between the first push rod 51 and the outer end face of the unlocking lever handle 21, the first spring 513 maintaining pushing the first push rod 51 outwards. After the cylinder spindle 11 is destructively compromised, the outer end face of the exterior drive block 14 is unblocked such that the first push rod 51 pushes the exterior drive block 14 to slide outwards, resulting in complete detachment of the outer end of the interior drive block 22 from the snap-in recess 141, which interrupts the drive connection between the exterior drive block 14 and the interior drive block 22 and thusly prevents, after the cylinder spindle 11 is destructively compromised, the exterior drive block 14 from being turned by a tool to drive the turnpiece 4 to rotate to unlock. To further prevent the exterior drive block 14 from being destructively pushed inwards so that the exterior drive block 14 and the interior drive block 22 resume drive connection leading to destructive lock bypass, as illustrated in Fig. 5, the pusher element 5 further comprises a first limiting pin 52, while a first anti-destructive-bypass recess 511 is arranged at an outer peripheral wall of the inner end of the first push rod 51, the first limiting pin 52 being slidingly arranged at the drive connection portion 41, the axial line of the first limiting pin 52 being perpendicular to the axial line of the first push rod 51; the first limiting pin 52 has an initial position where the turnpiece 4 is unblocked for unlocking and a blocked position where the turnpiece 4 is blocked after the cylinder spindle 11 is destructively compromised. In some implementations, the drive connection portion 41 is provided with a second spring 521 at a side of the first limiting pin 52 facing away from the first push rod 51. As illustrated in Fig. 6, when the first push rod 51 pushes the exterior drive block 14 so that the first limiting pin 52 is disposed at the blocked position, the second spring 521 pushes the first limiting pin 52 towards the first push rod 51, causing the first limiting pin 52 projected into the first anti-destructive-bypass recess 511 so as to lock the first push rod 51 in the axial direction of the turnpiece 4, which prevents the exterior drive block 14 from being destructively pushed inwards leading to resumption of the drive connection between the exterior drive block 14 and the interior drive block 22, thereby ensuring that the exterior drive block 14 and the interior drive block 22 maintain detached till the turnpiece 4 is blocked, further preventing the exterior drive block 14 from being destructively pushed to resume drive connection between the exterior drive lock 14 and the interior drive block 22 leading to destructive lock bypass, whereby security of the lock cylinder mechanism is enhanced.
[0035] To further enhance anti-destructive-bypass security of the first push rod 51, as illustrated in Figs. 5 and 6, the outer end of the interior drive block 22 is disposed eccentrically with the outer end of the drive connection portion 41 so that an abutting stage 413 is formed at the inner wall of the outer end of the drive connection portion 41; the eccentric connection manner allows for the eccentric distance to form a torque when the interior drive block 22 drives the turnpiece 4 to rotate, which facilitates the user to turn the unlocking lever handle 21 or use a key to lock or unlock the door. A first abutting face 221 is arranged at the outer peripheral wall of the interior drive block 22, the abutting stage 413 is formed by protrusion of the inner wall of the outer end of the drive connection portion 41 towards the axial center, and a second abutting face 4131 is formed at the inner sidewall of the abutting stage 413, so that when the turnpiece 4 is assembled with the interior drive block 22, the first abutting face 221 abuts against the second abutting face 4131, which prevents, when the cylinder spindle 11 is destructively compromised, the interior drive block 22 from also sliding outwards to maintain insertion-fitted with the exterior drive block 14 leading to destructive lock bypass. A second anti-destructive-bypass recess 512 is provided at the outer peripheral wall of the inner end of the first push rod 51, and a second limiting pin 53 is provided for the abutting stage 413, the axial line of the second limiting pin 53 being parallel to the axial line of the first limiting pin 52, both axial lines being perpendicular to the axial direction of the first push rod 51. The second limiting pin 53 has an initial position where the turnpiece 4 is unblocked for unlocking and a blocked position where the turnpiece 4 is blocked after the cylinder spindle 11 is destructively compromised; as illustrated in Fig. 6, when the second limiting pin 53 is disposed at the blocked position, the second limiting pin 53 projects into the second anti-destructive-bypass recess 512 to lock the first push rod 51, whereby the exterior drive block 14 maintains detached from the interior drive block 22 till the turnpiece 4 is blocked, further preventing destructive lock bypass. In some implementations, a third spring 531 is arranged between the abutting stage 413 and the second limiting pin 53, the third spring 531 having a tendency of pushing the second limiting pin 53 to project into the second anti-destructive-bypass recess 512; as illustrated in Fig. 7, the first limiting pin 52 and the second limiting pin 53 are distributed in an upper-lower manner and configurable to lock the first push rod 51 from two parallel directions, respectively, whereby the first push rod 51 is contributed an enhanced anti-destructive-bypass security.
[0036] In the implementations described supra, although the first limiting pin 52 and the second limiting pin 53 both serve to block the first push rod 51, as far as the exterior drive block 14 is concerned, it is only pushed outwards by the first push rod 51, so that the exterior drive block 14 receives an unbalanced stress during the process of sliding outwards, which easily causes the exterior drive block 14 to be deflected and jammed.
[0037] To prevent the exterior drive block 14 from being jammed due to one-sided stress, as illustrated in Figs. 5, 6 and 7, a second chamber 412 is provided for the drive connection portion 41, an axial direction of the second chamber 412 being parallel to the axial direction of the turnpiece 4, the second chamber 412 and the first chamber 411 being circumferentially distributed uniformly at two lateral sides of the interior drive block 22; the second chamber 412 is provided with a second push rod 54 abutting against the inner end face of the exterior drive block 14, a fourth spring 541 being arranged between the second push block and the outer end face of the unlocking lever handle 21, the fourth spring 541 having a tendency of pushing the second push rod 54 outwards so that the second push rod 54 is contributed a tendency of pushing the interior drive block 22 to abut outwards. As the first push rod 51 and the second push rod 54 abut against the exterior drive block 14 from two lateral sides of the axial line of the turnpiece 4, the exterior drive block 14 is stressed from two lateral sides during the process of sliding outwards after the cylinder spindle 11 is destructively compromised, without being jammed like the one-sided stress circumstance, which prevents occurrence of a jamming-induced drive connection between the exterior drive block 14 and the interior drive block 22 leading to destructive lock bypass after the cylinder spindle 11 is destructively compromised.
[0038] In this implementation, as illustrated in Figs. 5, 6, and 7, a third anti-destructive-bypass recess 542 is arranged at an outer peripheral surface of the inner end of the second push rod 54, and a third limiting pin 543 is provided for the drive connection portion 41, the third limiting pin 543 being perpendicular to the axial direction of the second push rod 54, the third limiting pin 543 having an initial position where the turnpiece 4 is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle 11 is destructively compromised; the third limiting pin 543 disposed at the blocked position projects into the third anti-destructive-bypass recess 542 so that the exterior drive block 14 maintains detached from the interior drive block 22 causing the turnpiece 4 to be blocked. In some implementations, the third limiting pin 543 is disposed sliding along the radial direction of the drive connection portion 41, a recess 5431 is arranged at a side of the third limiting pin 543 facing away from the second push rod 54, and an elastic member 544 is arranged in the recess 5431, the elastic member 544 being socketed by the recess 5431, which prevents the elastic member 544 from migrating from the limiting pin 543 so that the third limiting pin 543 would not be affected in blocking the second push rod 54; the opposite end of the elastic member 544 abuts against the inner wall of the housing of the lock cylinder mechanism. The third limiting pin 543 disposed at the initial position abuts against the outer peripheral wall of the second push rod 54. When the third limiting pin 543 is disposed at the blocked position, the elastic member 544 drives the third limiting pin 543 to project into the third anti-destructive-bypass recess 542 to lock the second push rod 54, which further prevents destructive lock bypass and thus enhances security of the lock cylinder mechanism.
[0039] Besides the example implementations described supra, the disclosure further has other implementations. All other implementations derived by a person of normal skill in the art based on the example implementations described herein fall within the scope of protection as sought in the disclosure.
Claims
1. A lock cylinder mechanism, comprising: an interior cylinder body, an exterior cylinder body, and a connecting lever securely connected to both of the interior cylinder body and the exterior cylinder body, the interior cylinder body being provided with an unlocking lever handle, the exterior cylinder body being provided with a cylinder spindle, a turnpiece being arranged between the unlocking lever handle and the cylinder spindle, the unlocking lever handle being provided with an interior drive block, the cylinder spindle being provided with an exterior drive block, the turnpiece being in drive connection respectively with the interior drive block and the exterior drive block, the connecting lever being provided with a securing block, the securing block being provided with a through hole configurable for the exterior drive block to pass through, a sealing pad configurable to seal the through hole being arranged between the securing block and the exterior cylinder body, the exterior drive block passing through the sealing pad in a hermetical fitting manner, wherein a protective shroud is arranged between the exterior cylinder body and the securing block, the protective shroud peripherally envelops the sealing pad, the protective shroud is secured to an inner end of the cylinder spindle to dispose the sealing pad to abut against an inner end face of the cylinder spindle.
2. The lock cylinder mechanism of claim 1, wherein a limiting portion is provided at an outer side of the protective shroud, and a limiting face is formed at an outer peripheral wall of the inner end of the cylinder spindle, the limiting portion abutting against the limiting face to axially secure the sealing pad.
3. The lock cylinder mechanism of claim 2, wherein an internal diameter of the limiting portion is gradually shrunk outwards so that a tapered section that is larger inwards than outwards is formed at an inner sidewall of the limiting portion, the limiting face being fitted with an inner sidewall of the tapered section.
4. The lock cylinder mechanism of any of claims 1 to 3, wherein the turnpiece comprises a drive connection portion at its inner end and a socketing portion at its outer end, the interior drive block being in drive connection with the drive connection portion, the exterior drive block projecting into the socketing portion so as to be in drive connection with the interior drive block.
5. The lock cylinder mechanism of claim 4, wherein an outer end of the exterior drive block is in drive connection with the cylinder spindle, an inner end of the exterior drive block is provided with a snap-in recess, an outer end of the interior drive block projects into the snap-in recess so that the interior drive block and the exterior drive block are connected in a transmission manner, and the drive connection portion is provided with a pusher element that is operable to push the exterior drive block after the cylinder spindle is destructively compromised so that the exterior drive block migrates from the interior drive block to prevent destructive lock bypass.
6. The lock cylinder mechanism of claim 5, wherein the pusher element comprises a first push rod and a first limiting pin, the drive connection portion is formed with a first chamber, the first push rod is disposed slidingly in the first chamber, and the first push rod abuts against the exterior drive block so as to be contributed a tendency of pushing the exterior drive block to slide outwards to migrate from the interior drive block; a first anti-destructive-bypass recess is provided at an outer peripheral wall of an inner end of the first push rod, and the first limiting pin, which is arranged at the drive connection portion, has an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the first limiting pin disposed at the blocked position projecting into the first anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
7. The lock cylinder mechanism of claim 6, wherein the outer end of the interior drive block is eccentrically arranged with respect to an outer end of the drive connection portion so that an abutting stage is formed at an inner wall of the outer end of the drive connection portion, a second anti-destructive-bypass recess is arranged at an outer peripheral wall of the inner end of the first push rod, a second limiting pin is provided for the abutting stage, and the second limiting pin has an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the second limiting pin disposed at the blocked position projecting into the second anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
8. The lock cylinder mechanism of any of claims 4 to 7, wherein the drive connection portion is formed with a second chamber, the second chamber being provided with a second push rod abutting against an inner end face of the exterior drive block, the second push rod having a tendency of pushing the interior drive block to abut outwards.
9. The lock cylinder mechanism of claim 8, wherein a third anti-destructive-bypass recess is arranged at an outer peripheral wall of an inner end of the second push rod, and a third limiting pin is provided for the drive connection portion, the third limiting pin having an initial position where the turnpiece is unblocked for unlocking and a blocked position where the turnpiece is blocked after the cylinder spindle is destructively compromised, the third limiting pin disposed at the blocked position projecting into the third anti-destructive-bypass recess so that the exterior drive block maintains detached from the interior drive block to thereby block the turnpiece.
10. The lock cylinder mechanism of claim 9, wherein the third limiting pin is disposed sliding in a radial direction of the drive connection portion, and a recess is arranged at a side of the third limiting pin facing away from the second push rod, an elastic member projecting into the recess to push the second push rod to abut against the third limiting pin so that the third limiting pin is contributed a tendency of being insertion-fitted into the third anti-destructive-bypass recess.