Padlock with fully integrated dual locking mechanism with reset mechanism

• US 10,221,591 B2
• Filed: 11/02/2015
• Issued: 03/05/2019
• Est. Priority Date: 07/07/2015
• Status: Active Grant

• Current Assignee: The Sun Lock Company Ltd.
• Original Assignee: The Sun Lock Company Ltd.
• Inventors: Lai, Karl
• Primary Examiner(s): Cuomo, Peter M.
• Assistant Examiner(s): McClure, Morgan J
• Application Number:
  US14/929,880
• Publication Number:
  US 20170009488A1
• Time in Patent Office: 1,219 Days
• CPC Class Codes: E05B 37/0034 actuated by either
• CPC Class Codes: E05B 37/0058 by axial disengagement between hub and rim of tumbler discs or rings
• CPC Class Codes: E05B 37/025 in padlocks
• CPC Class Codes: E05B 67/24 with built- in cylinder locks
• CPC Class Codes: H01H 9/20 Interlocking, locking, or latching mechanisms
• CPC Class Codes: H01H 9/287 wherein the operating part is made inaccessible or more difficult to access by a lid, cover or guard, e.g. lockable covers

Abstract

A dual locking padlock having a code locking mechanism and an overriding mechanism is disclosed. The housing has a top body as its top portion, a stack of dials and a stack of clutches mounted on a middle portion and a bottom portion having holes to receive screws from the top body for securing the housing. Dials are engagingly mounted on the clutches and only rotatable relative to the clutch when the lock is in the opened mode for changing the combination code. The housing has a spindle having a channel to store the heel of a shackle. The spindle'"'"'s upward movement allows the shackle to be pulled upward to unlock the padlock. The spindle is allowed to move upward either when a correct combination code is used or when a key activates the overriding mechanism. With the overriding mechanism, the padlock can also be opened with a key.

Claims

1. A padlock operable in a locked mode and in an opened mode, comprising:

a shackle having a heel and a toe;

a lock housing configured to store the heel of the shackle, the lock housing comprising a top portion, a middle portion and a bottom portion, the top portion arranged to engage with the toe, wherein the shackle can be partially released from the lock housing from a first shackle position to a second shackle position;

a spindle disposed inside the lock housing and arranged to provide a code locking mechanism, the code locking mechanism configured to operate the padlock in the locked mode or in the opened mode based on a combination code, the spindle comprising a cylindrical surface;

a plurality of clutches rotatably mounted on the cylindrical surface of the spindle;

a plurality of dials mounted in the middle portion of the lock housing in relationship to the clutches to form the combination code; and

an overriding mechanism disposed in relationship to the spindle, the overriding mechanism activatable to cause the padlock to operate in the opened mode, wherein the shackle is in the first shackle position when the padlock is operated in the locked mode, and the shackle is in the second shackle position when the padlock is operated in the opened mode, wherein each of the clutches comprises an extended outer ring, the extended outer ring having a ring surface facing the top portion of the lock housing, the ring surface having thereon one or more extended fins, and each of the dials has an inner wall defining an inner diameter, each of the dials comprising an extended inner ring extended inward from the inner diameter, the extended inner ring having an upper part and a lower part, the upper part having an upper surface facing the top portion of the housing, the lower part having thereon a plurality of ring gaps arranged to receive said one or more extended fins of a clutch so as to control rotational movement of said clutch relative to the spindle, wherein the bottom portion of the lock housing comprises a bottom body, and wherein the spindle is movably mounted on the bottom body such that the spindle can be caused to move upward toward the top portion of the lock housing in a vertical movement from a first spindle position to a second spindle position, and wherein each of the clutches comprises an extended inner ring having a ring thickness and an opening gap made through the ring thickness, and the spindle comprises a plurality of extended protrusions extended from the cylindrical surface, each extended protrusion associated with a clutch such that the inner ring of the clutch prevents the spindle from moving upward when the extended protrusion is misaligned with the opening gap of the associated clutch.

2. The padlock according to claim 1, wherein the heel of the shackle comprises a neck area, and said padlock further comprises a latch having a fork arranged to engage the neck area of the heel so as to prevent the shackle from moving away from the first shackle position when the padlock is operated in the locked mode.

3. The padlock according to claim 2, wherein the spindle comprises a spindle channel for storing the heel, the spindle channel having a channel portion for storing part of the neck area of the heel, and the latch is disposed in relationship to the channel portion, and wherein the spindle further comprises a cam arranged to engage the latch so as to keep the fork in an engaging relationship with the neck area of the heel.

4. The padlock according to claim 3, wherein the overriding mechanism can be activated by a key, causing the cam to disengage the fork of the latch from the neck area of the heel, allowing the shackle to move from the first shackle position to the second shackle position.

5. The padlock according to claim 1, wherein when the padlock is operated in the locked mode, the dials can be rotated relative to the spindle to change the combination code and the clutches are caused to rotate along with the dials, such that when the combination code matches a predetermined code, the opening gap of each of the clutches aligns with an associated extended protrusion of the spindle, allowing the spindle to move from the first spindle position to the second position when the shackle is pulled upward from the first shackle position to the second shackle position, causing the padlock to operate in the opened mode.

6. The padlock according to claim 5, wherein the plurality of dials form a dial stack comprising a first dial and a last dial, the last dial positioned in contact to the bottom body of the lock housing, and wherein the top portion of the lock housing comprises a top body mounted on the first dial, the top body comprising a locking hole and a top body hole, the locking hole dimensioned to receive the toe of the shackle, the top body hole in communication with the spindle channel for placement of the heel of the shackle, and wherein the top body hole has a first extended notch and a second extended notch, wherein the heel of the shackle comprises a shackle protrusion located inside the lock housing adjacent to the top body hole when the shackle is in the first shackle position such that when the shackle is caused to move upward to the second shackle position, the shackle protrusion is also caused to move outside of the lock housing through the first extended notch.

7. The padlock according to claim 6, wherein the plurality of clutches form a clutch stack having a first clutch associated with the first dial and a last clutch associated with the last dial, and wherein the spindle comprises a spindle edge extended from the cylindrical surface of the spindle, the spindle edge positioned in relationship to the extended inner ring of the first clutch, and wherein when the shackle in the second shackle position is caused to rotate so as to align the shackle protrusion with the second extended notch of the top body hole, the heel of the shackle is allowed to move downward to cause the spindle to move downward in a downward movement, the downward movement of the spindle causing the clutches to disengage from the dials as the spindle edge of the spindle pushes the extended inner ring of the first clutch downward.

8. The padlock according to claim 7, wherein the downward movement of the spindle also causes the extended protrusions of the spindle to engage the opening gaps of the clutches, preventing the clutches from rotation relative to the spindle, and as the clutches are disengaged from the dials, the dials can be independently and individually rotated for changing the pre-determined code in a reset process.

9. The padlock according to claim 7, wherein the bottom portion of the lock housing comprises a spring arranged to provide an urging force to move the clutches upward after the shackle and the spindle are caused to move upward following the downward movement of the spindle.

10. The padlock according to claim 1, wherein each of the clutches comprises a first side and an opposing second side, the first side comprising said one or more extended fins, the opposing second side having a surface having a plurality of surface indents, said padlock further comprising a plurality of ratchet-wave plates, each of the ratchet-wave plates arranged to associate with a clutch, each ratchet-wave plate comprising one or more plate edges arranged to contact different ones of the surface indents as said clutch is caused to rotate relative to the associated ratchet plate.

11. The padlock according to claim 10, wherein the spindle further comprises an elongated slot made into part of the cylindrical surface of the spindle, and wherein each of the ratchet-wave plates comprises a first plate ring having an inner diameter arranged to receive the cylindrical surface of the spindle, wherein each of the ratchet-wave plates further comprises a first plate slot arranged to receive one of the extended protrusions of the spindle, and a first plate tail extended from the first plate ring into the inner diameter, the first plate tail arranged to locate in the elongated slot of the spindle so as to prevent the ratchet-wave plate from rotating relative to the spindle.

12. The padlock according to claim 11, further comprising a plurality of reset-ratchet plates, each reset-ratchet plate positioned adjacent to a ratchet-wave plate, each reset-ratchet plate comprises a second plate ring having an inner diameter arranged to receive the cylindrical surface of the spindle, wherein each of the reset-ratchet plates further comprises a second plate slot arranged to receive one of the extended protrusions of the spindle, and a second plate tail extended from the second plate ring into the inner diameter of the second plate ring, the second plate tail arranged to locate in the elongated slot of the spindle so as to prevent the reset-ratchet plate from rotating relative to the spindle, and wherein each of the reset-ratchet plates comprises a plurality of fingers extended from an outer diameter of the second plate ring and each of the dials comprises an inner surface having a plurality of surface slots arranged to contact the finger of a reset-ratchet plate when said each of the dials is rotated relative to the spindle.

13. The padlock according to claim 1, wherein the extended inner ring of the clutch further comprises a plurality of faulty notches made through a part of the ring thickness.

14. The padlock according to claim 6, wherein the bottom portion of the lock housing comprises a plurality of screw receiving holes, and the lock housing further comprises screws arranged to fasten the top body to the screw receiving holes on the bottom portion, and wherein the top body comprises screw holes configured for insertion of the screws, and the spindle comprises a plurality of screw passing slots on the cylindrical surface to allow the screws to reach the screw receiving holes on the bottom body.