# Patent

## Title
Padlock

## Abstract

A padlock can be unlocked by an owner dialing an unlocking number or security personnel using a general key. The padlock includes a lock body, a block, a shackle, a general locking device and a private locking device. The lock body includes a first channel and a second channel therein. The block is inserted in the second channel. The block includes a receptacle therein. The shackle includes a long arm movably disposed in the first channel and a short arm for engagement with the receptacle of the block. The general locking device is disposed in the lock body for locking and unlocking the long arm of the shackle. The private locking device is disposed in the lock body for controlling the block so that the block can be engaged with and disengaged from the short arm of the shackle.

## Background
CROSS-REFERENCE
The present application is a divisional application of U.S. patent application Ser. No. 10/671,659 filed on 29 Sep. 2003 of which the disclosure is incorporated herein.


BACKGROUND OF INVENTION
1. Field of Invention
The present invention relates to a padlock and, more particularly, to a padlock including a shackle locked by key-operable locking means at an end and locked by combination locking means at another end so, that the padlock can be unlocked by using a key or dialing the combination locking means to an unlocking number.
2. Related Prior Art
To prevent belongings from missing, travelers usually lock their trunks, suitcases, briefcases, bags or the like. A combination lock is the most common lock installed in a trunk because it takes little space. Each traveler sets up an unlocking number for the combination lock. Thereby, others cannot unlock his trunk without knowing the unlocking number. However, terrorists may use trunks to deliver explosives. In airports, security personnel may have to check travelers' trunks without their presence. In some countries, travelers are required not to lock their trunks. The travelers may lose their belongings if leaving their trunks unlocked. If the travelers lock their trunks, the security personnel are authorized to break the trunks for security check. There is a dilemma between the travelers' rights and the flight safety. Therefore, there is a need for padlocks that can protect the travelers' belongings and allow the security personnel to unlock them.
SUMMARY OF INVENTION
It is therefore an objective of the present invention to provide a padlock that can be unlocked by an owner dialing an unlocking number or security personnel using a general key.
According to the present invention, a padlock includes a lock body, a block, a shackle, general locking means and private locking means. The lock body includes a first channel and a second channel therein. The block is disposed in the second channel. The block includes a receptacle therein. The shackle includes a long arm movably disposed in the first channel and a short arm for insertion in the receptacle of the block. The general locking means is disposed in the lock body for locking and unlocking the long arm of the shackle. The private locking means is disposed in the lock body for controlling the block so that the block can be engaged with and disengaged from the short arm of the shackle.



BRIEF DESCRIPTION OF DRAWINGS
The present invention will be described via the detailed illustration of embodiments referring to the drawings wherein:
FIG. 1 is a perspective view of a padlock according to a first embodiment of present invention;
FIG. 2 is a cross-sectional view of the padlock in a locked position;
FIG. 3 is a perspective view of key-operable locking means used in the padlock;
FIG. 4 is a cross-sectional view of the padlock, showing the key-operable locking means engaged with a flange of a long arm of a shackle;
FIG. 5 is a perspective view of the padlock, showing a block moved downwardly and a short arm of the shackle removed from the block;
FIG. 6 is a cross-sectional view of the padlock, showing the long arm of the shackle released from the key-operable locking means;
FIG. 7 is a cross-sectional view of the padlock, showing the flange of the long arm of the shackle released from the key-operable locking means;
FIG. 8 is a cross-sectional view of a padlock according to a second embodiment of the present invention, showing a shackle locked;
FIG. 9 is another cross-sectional view of the padlock shown in FIG. 8, showing a semi-cylinder engaged with a rectangular bump of a locking block;
FIG. 10 is another cross-sectional view of the padlock shown in FIG. 8, showing the block moved downwardly and a short arm of the shackle disengaged from the block;
FIG. 11 is another cross-sectional view of the padlock shown in FIG. 8, showing a long arm of the shackle released from a hook of the locking block;
FIG. 12 is another cross-sectional view of the padlock shown in FIG. 8, showing a semi-cylinder rotated and pressed against a rectangular bump of the locking block;
FIG. 13 is a perspective view of a padlock according to a third embodiment of the present invention;
FIG. 14 is a cross-sectional view of the padlock shown in FIG. 13, showing a shackle locked;
FIG. 15 is an exploded view of a block of the padlock shown in FIG. 13;
FIG. 16 is another perspective view of the padlock shown in FIG. 13, showing a gap of a receptacle of the block rotated to a position for releasing a short arm of the shackle;
FIG. 17 is a cross-sectional view of the padlock shown in FIG. 13, showing the short arm of the shackle released from the gap of the receptacle of the block;
FIG. 18 is a perspective view of a padlock according to a fourth embodiment of the present invention;
FIG. 19 is a cross-sectional view of the padlock shown in FIG. 18, showing a shackle locked;
FIG. 20 is an exploded view of key-operable locking means and a block of the padlock shown in FIG. 18;
FIG. 21 is a cross-sectional view of the padlock shown in FIG. 18, showing a long arm of the shackle released from combination locking means;
FIG. 22 is another perspective view of the padlock shown in FIG. 18, showing a slot of an engaging portion of the block rotated to a position for releasing a short arm of the shackle;
FIG. 23 is a cross-sectional view of the padlock shown in FIG. 18, showing the slot of the engaging portion of the block rotated by a key and the short arm of the shackle removed from the slot;
FIG. 24 is a perspective view of a padlock according to a fifth embodiment of the present invention;
FIG. 25 is a cross-sectional view of the padlock shown in FIG. 24, showing a shackle locked and a protrusion of a block engaged with a hemi-cylinder for preventing the block from rotation;
FIG. 26 is another perspective view of the padlock shown in FIG. 24, showing the block rotated to allow a short arm of the shackle released from the slot;
FIG. 27 is a cross-sectional view of the padlock shown in FIG. 24, showing the key rotating the hemi-cylinder to a position for allowing the rotation of the block to allow the release of the short arm of the shackle from the slot;
FIG. 28 is a perspective view of a padlock according to a sixth embodiment of the present invention;
FIG. 29 is a cross-sectional view of the padlock shown in FIG. 28, showing a shackle locked;
FIG. 30 is an exploded view of an engaging block and a mounting block of a block of the padlock shown in FIG. 28; and
FIG. 31 is a cross-sectional view of the padlock shown in FIG. 28, showing the block moved downwardly for releasing a short arm of the shackle.



DETAILED DESCRIPTION OF EMBODIMENTS
With reference to FIGS. 1 and 2, a padlock includes a lock body 1, a block 3, a shackle 2, key-operable locking means 4 and combination locking means 5 according to a first embodiment of the present invention. The lock body 1 includes a first channel 10 and a second channel 11 therein.
The block 3 includes a mounting portion 30, an engaging portion 31 formed on the mounting portion 30 and a receptacle 32 defined in the engaging portion 31. The mounting portion 30 is disposed in the second channel 11 of the lock body 1. The engaging portion 31 is located outside the second channel 11 of the lock body 1.
The shackle 2 includes a long arm 20 movably disposed in the first channel 10 and a short arm 21 for insertion in the receptacle 32 of the block 3. The long arm 20 of the shackle 2 includes a flange 23 near an end thereof.
The combination locking means 5 is disposed in the lock body 1 for controlling the block 3 so that the block 3 can be engaged with and disengaged from the shackle 2. The combination locking means 5 includes a stem 51 connected to the mounting portion 30 and plural number wheels 50 rotationally mounted on the stem 51 for controlling the stem 51 and therefore the block 3.
The key-operable locking means 4 is disposed in the lock body 1 for locking and unlocking the long arm 20 of the shackle 2.
Referring to FIGS. 3, 4 and 7, the key-operable locking means 4 includes a body 40, a rotor 41 disposed in the body 40 and a driving rod 44 extended from the rotor 41. The rotor 41 includes a keyhole 43 therein for receiving a key 42. The driving rod 44 includes a notch 441 therein for receiving the flange 23 of the long arm 20 of the shackle 2. The key 42 can rotate the rotor 41 and the driving rod 44 to disengage the notch 441 from the flange 23.
With reference to FIGS. 2 and 5, when the number wheels 50 are dialed to an unlocking number, the stem 51 can be moved vertically. As the stem 51 is connected to the mounting portion 30 of the block 3 formed beneath the engaging portion 31, the engaging portion 31 of the block 3 can be moved downwardly and the short arm 21 of the shackle 2 can be removed from the receptacle 32 of the block 3.
Referring to FIGS. 2 and 6, a first spring 24 is engaged with the flange 23 of the long arm 20 of the shackle 2 for biasing the shackle 2. When the notch 441 is not engaged with the flange 23, the spring 24 ejects the long arm 20 of the shackle 2 automatically. Because the shackle 2 is rigid, the short arm 21 is also moved out of the receptacle 32 of the block 3 when the long arm 20 is ejected.
With reference to FIGS. 2 and 5, a second spring 301 is compressed between the combination locking means 5 and the block 3. The second spring 301 can return the block 3 to its original position so that the receptacle 32 can be engaged with the short arm 21 of the shackle 2 again.
As discussed above, the short arm 21 of the shackle 2 can be removed from the receptacle 32 of the block 3 by using the key 42 to unlock the key-operable locking means 4 or dialing the number wheels 50 to an unlocking number. Padlock manufactures can be requested by governments having security concerns to make padlocks with identical key-operable locking means 4. Thus, these padlocks can be unlocked by the security personnel using the key 42. However, users can set specific unlocking numbers of the combination locking means 5 of these padlocks and unlocking the padlocks by dialing the specific unlocking numbers. Accordingly, the users can prevent belongings from missing and the security personnel can open the padlock when necessary while others cannot open the padlock.
Referring to FIGS. 8 through 11, a padlock according to a second embodiment of the present invention is shown. The second embodiment includes a lock body 1a, a block 3a, a shackle 2a and combination locking means 5a like the lock body 1, the block 3, the shackle 2 and the combination locking means 5 of the first embodiment. However, the block 3a further includes a hood 301a mounted thereon. The hood 301a is movable synchronously with the block 3a. The hood 301a includes plural windows 302a therein, corresponding to the number wheels 50a of the combination locking means 5a. When the padlock is locked, the hood 301a covers the number wheels 50a so that the number wheels 50a cannot be reached. If the padlock is unlocked, the number wheels 50acan be reached through the windows 302a. 
The second embodiment further includes a locking mechanism 6 formed therein. The locking mechanism 6 includes a locking block 60 with a hook 601 on the top thereof for engagement with the flange 23a of the long arm 20a of the shackle 2a, a rectangular bump 602 on the bottom thereof and a spring 61 for biasing the locking block 60 to engage with the flange 23a of the long arm 20a of the shackle 2a. 
The second embodiment further includes key-operable locking means 4a with a body 40a, a rotor 41a in the body 40a and a hemi-cylinder 44a extended from the rotor 41a. The rotor 41a includes a keyhole 43a therein for receiving a key 42a. The hemi-cylinder 44a is engaged with the rectangular bump 602 for releasing the hook 601 of the locking block 60 from the flange 23a of the long arm 20a of the shackle 2a. 
Referring to FIG. 9, when a flat surface of the hemi-cylinder 44a is overlaid with a flat surface of the rectangular bump 602, the hook 601 is engaged with the flange 23a of the long arm 20a. 
Referring to FIGS. 11 and 12, when the key 42a rotates and causes hemi-cylinder 44a is rotated by the key 42a to press against the rectangular bump 602 to move the locking block 60 away from the flange 23a, the hook 601 is disengaged from the flange 23a of the long arm 20a. Then, the long arm 20a is biased upward and the short arm 21a is removed from the receptacle 32a. 
With reference to FIGS. 13 through 17, a padlock according to a third embodiment of the present invention includes a lock body 1b, a shackle 2b, a block 3b, a locking mechanism 6b and key-operable locking means 4b like the lock body 1a, the shackle 2a, the block 3a, the locking mechanism 6a and the key-operable locking means 4a of the second embodiment. The third embodiment further includes combination locking means 5b including a stem 51b with a recess 53 at an upper end thereof. The recess 53 includes a concave 531 in a wall thereof. The block 3b includes a gap 33 in communication with the receptacle 32b of the block 3b. The gap 33 includes a width larger than the diameter of the short arm 21b for receiving the short arm 21b. The mounting portion 30b of the block 3b includes a protrusion 34 thereon for engagement with the concave 531. The mounting portion 30b is disposed in the recess 53. After the combination locking means 5b is dialed to an unlocking number, the gap 33 is rotated to a position where the short arm 21b of the shackle 2b can be removed from the gap 33.
The first, second and third embodiments include similar structures including the key-operable locking means 4, 4a, 4b for locking and unlocking the long arms 20, 20a and 20b of the shackles 2, 2a and 2b and the combination locking means 5, 5a, 5b for controlling the blocks 3, 3a and 3b so that the block 3, 3a and 3b can be engaged with and disengaged from the short arm 21, 21a and 21b of the shackle 2, 2a and 2b. However, other arrangements as follows also work.
With reference to FIGS. 18 through 23, the padlock according to a fourth embodiment of the present invention includes a lock body 70, a block 72, a shackle 71, combination locking means 9 and key-operable locking means 8.
The lock body 70 includes a first channel 701 therein, a second channel 702 therein, a space 703 in a corner thereof and a wall 7031 formed thereon so that the wall 7031 stands by the space 703.
The block 72 includes a mounting portion 721, an engaging portion 722 and a neck 720 formed between the mounting portion 721 and the engaging portion 722. The mounting portion 721 includes two sockets 724 therein. The engaging portion 722 includes a receptacle 723 in the top and a gap 725 in the periphery and in communication with the receptacle 723. The diameter of the neck 720 is smaller than that of the mounting portion 721 and the engaging portion 722.
The mounting portion 721 is disposed in the lock body 70. The neck 720 is disposed in the second channel 702. The engaging portion 722 is disposed in the space 703.
The shackle 71 includes a long arm 711 movably disposed in the first channel 701 and a short arm 712 for insertion in the receptacle 723 of the block 72. The long arm 711 of the shackle 71 includes a stop 714 extending from at an end thereof. The stop 714 is enclosed or grabbed by a head 910 which extends from a stem 90 of the combination locking means 9. The size of the stop 714 is larger than that of an opening of the first channel 701 for preventing the long arm 711 from fully sliding off the first channel 701. The diameter of the short arm 712 is smaller than the width of the gap 725 so that the short arm 712 can be moved through the gap 725.
The combination locking means 9 is disposed in the lock body 70 for locking and unlocking the long arm 711 of the shackle 71. The combination locking means 9 includes the stem 91 and the head 910 for engagement with the stop 714 of the long arm 711 of the shackle 71. The combination locking means further includes plural number wheels 90 rotationally mounted on the stem 91 to control movement of the stem 91.
When the combination locking means 9 is dialed to an unlocking number, the stem 91 together with the head 910 is allowed to move, and thereby the long arm 711 including the stop 714 is allowed to be moved upward with the stem 91 and the head 910 or be biased upwardly. After the long arm 711 is moved up by a user, the short arm 712 is removed from the receptacle 723, as shown in FIG. 21.
The key-operable locking means 8 is disposed in the lock body 70 for controlling the block 72 so that the block 72 can be engaged with and disengaged from the short arm 712 of the shackle 71. The key-operable locking means 8 includes a body 80, a rotor 81 disposed in the body 80, a driving rod 813 extended from the rotor 81 and two plates extended from the driving rod 813. The rotor 81 includes a keyhole 811 therein for receiving a key 82. The plates 812 are disposed in the sockets 724 so that the rotor 81 can rotate the block 72.
As shown in FIG. 18, the block 72 is in a locking position where the gap 725 thereof is completely blocked by the wall 7031 of the lock body 70. Thus, the short arm 712 of the shackle 71 is restrained in the receptacle 723 of the block 72.
The key 82 can rotate the rotor 81. The rotor 81 can in turn rotate the block 72 to an unlocking position where the gap 725 of the locking block 72 is not blocked by the wall 7031 of the body 70. Thus, the short arm 712 of the shackle 71 can be removed from the receptacle 723 of the block 72 through the gap 725.
With reference to FIGS. 24 through 27, a padlock according to a fifth embodiment of the present invention includes a lock body 70a, a block 72a, a spring 724a, a shackle 71a, combination locking means 9a and key-operable locking means 8a. The lock body 70a includes a channel 701a therein.
The block 72a is pivotally disposed in the lock body 70a. The block 72a includes a slot 723a therein. The spring 724a is engaged with the block 72a for returning the locking block 72a to its original position.
The shackle 71a includes a long arm 711a movably disposed in the channel 701a and a short arm 712a for insertion in the slot 723a of the block 72a. 
The combination locking means 9a is disposed in the lock body 70a for locking and unlocking the long arm 711a of the shackle 71a. The combination locking means 9a of the fifth embodiment is identical to the combination locking means 9 of the fourth embodiment.
The key-operable locking means 8a is disposed in the lock body 70a for controlling the rotation of the block 72a so that the block 72a can be engaged with and disengaged from the short arm 712a of the shackle 71a. The block 72a includes a protrusion 721a formed thereon. The key-operable locking means 8a includes a body, a rotor 81a in the body and a hemi-cylinder 812a on the rotor 81a. The rotor 81a includes a keyhole 83a therein for receiving a key 82a. The hemi-cylinder 812a is engaged with the protrusion 721a of the block 72a. 
Referring to FIG. 25, the protrusion 721a is engaged with the hemi-cylinder 812a. Thus, the block 72a is prevented from rotation.
Referring to FIG. 27, the key 82a rotates the rotor 81 a and the hemi-cylinder 812a to a position where the block 72a can be pivoted to allow the removal of the short arm 712a from the slot 723a. 
With reference to FIGS. 28 through 31, a padlock according to a sixth embodiment of the present invention includes a lock body 70b, a shackle 71b, key-operable locking means 8b and combination locking means 9b like their counterparts of the fourth embodiment.
Referring to FIG. 30, a block 72b includes an engaging portion 722b and a mounting portion 77. The engaging portion 722b includes a column 721b at one end thereof, a hole 724b in the column 721b and an inclined surface on the column 721b. The mounting portion 77 includes a column 771 thereon, an inclined surface 773 on the column 771 and a shaft 774 extended from the column 771. The shaft 774 is rotationally and movably inserted in the hole 724b. The inclined surface 773 of the mounting portion 77 is used for contact with the inclined surface 725b of the engaging portion 722b. 
Referring to FIG. 29, when the padlock is locked, only the top of the inclined surface 725b of the engaging portion 722b contacts the top of the inclined surface 773 of the mounting portion 77. The total height of the block 72 is the largest.
Referring to FIG. 31, the padlock is unlocked by the key 82b so that the inclined surface 725b of the engaging portion 722b is aligned with the inclined surface 773 of the mounting portion 77. A spring is used to bias the engaging portion 722b downwards. Thus, the inclined surface 725b of the engaging portion 722b entirely contacts the inclined surface 773 of the mounting portion 77. The total height of the block 72b is the smallest. The engaging portion 722b of the block 72b is retreated into the lock body 70b so that the short arm 712b of the shackle 71b can be released from the receptacle 723b. 
The present invention has been described via the detailed illustration of the embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Therefore, the embodiments shall not limit the scope of the present invention defined in the claims.

## Claims

1. A padlock comprising:
a lock body comprising a first channel and a second channel therein;
a block disposed in said second channel, said block comprising a receptacle therein, a mounting portion disposed in said second channel of said lock body and an engaging portion formed on said mounting portion and located outside said second channel of said lock body so that said receptacle is defined in said engaging portion;
a shackle comprising a long arm movably disposed in said first channel and a short arm for insertion in said receptacle of said block;
a key-operable locking means disposed in said lock body to control axial movement of said long arm of said shackle; and
a combination locking means formed in said lock body and comprising a stem connected to said mounting portion and plural number wheels rotationally mounted on said stem to control movement of said block so that said short arm of said shackle can be confined in or released from said block by said combination locking means.

2. The padlock according to claim 1, wherein said long arm of said shackle comprises a flange near an end thereof, said padlock further comprising: a first spring pressed against said flange of said long arm of said shackle for biasing said shackle; and a second spring compressed between said combination locking means and said block for biasing said block.

3. The padlock according to claim 1 wherein said long arm of said shackle comprises a flange near an end thereof, and said key-operable locking means comprises: a body; a rotor being disposed in said body and comprising a keyhole defined therein for receiving a key; and a driving rod extending from said rotor and comprising a notch therein for engagement with said flange of said long arm of said shackle.

4. A padlock comprising:
a lock body;
a shackle comprising a long arm movably disposed in said lock body and a short arm;
a first locking means disposed in said lock body and configured to lock or unlock said long arm of said shackle to said lock body via a key;
a second locking means disposed in said lock body and operable independent of said key-operable locking means; and
a block connected with said second locking means and configured to engage with or disengage from said short arm of said shackle via said second locking means;
wherein said second locking means is a combination locking means, and comprises a stem connected to an end of said block and plural number wheels rotationally mounted on said stem to control said block.