Title of Invention

ACCESS CONTROL PADLOCK

Abstract

A access control padlock comprises of a housing wherein two chambers open at one end having entry side for key cylinders, a guide bores defined within the said chamber, at opposite end, a shackle rotatably slideable within the said bores, between open and closed position, where it is retracted out of housing and free to rotate about a limb retained into retainer cap and closed position wherein the open end is pushed into the housing and extends inside the cam, a first key cylinder and second key cylinder, means to fix the said key cylinders, the cams moveable by said key cylinders and having abutment projections adapted to be engaged and disengaged with complimentary recesses formed into shackle limb ends, wherein first cam is engaged with shorter limb end in locked position and disengages the same in unlocked position, the said cam is always in locked position wherein the key is removed from the said first key cylinder, when the key is inserted into first key cylinder and rotated through 90° clockwise, the said cam disengages with the shackle thereby allowing the shackle to move to open position of the said lock, a second can fitted partially moveable by the second key cylinder wherein a key can be inserted and removed in both the locked and unlocked positions of the second cam, this locks the second longer limb of the shackle, the said cam is always in disengagement with shackle limb to permit the lock to operate normally with the first key cylinder, when the said second key is inserted into said second cylinder and turned through 360° clockwise thereby rotating the said second cam through 90° clockwise which engages with the complimentary recesses provided on second limb of the shackle thereby providing the locking of second limb and key removed from the locking cylinder, the closing and opening of the shackle by the first key cylinder is prevented, thus the second key cylinder overrides the access of first key cylinder and makes it redundant, a retaining cap mounting means for said retainer cap, shackle retainer pin and fixing means for said retainer pin.

Full Text

FORM 2 THE PATENT ACT 1970 (39 Of 1970) The Patents Rules, 2 003 COMPLETE SPECIFICATION See Section 10, and rule 13) TITLE OF INVENTION ACCESS CONTROL PADLOCK 2. APPLICANT(S) a) Name b) Nationality c) Address GODREJ & BOYCE MFG. CO. LTD, INDIAN Company LOCKS DIVISION PLANT-18 PIROJSHANAGAR, VIKHROLI, MUMBAI - 400 079 PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed : - ACCESS CONTROL PADLOCK FIELD OF INVENTION The invention relates to a padlock more particularly the invention relates to a padlock. Controllable by the owner or master as and when he requires it. The padlock is having two key holes at the bottom to operate two independent cylinders with there respective corns to lock a unlock the shuckle one is master key and another is individual key. The individual keys can be provided to many operators for day to day locking and unlocking where the key rotates the cam by 90o therefore key can not be taken out without locking. The master key on the other hand can operate both the cylinders and therefore locking and unlocking is being controlling by a single person or the owner of the firm he can give access to many operators by providing individual keys to the operators by allowing master key cylinder in open condition by a rotating 360o and thereby allowing the key to take out. In other words the owner of madter key can disallow the access to his operators when he is absent by rotating the master key 360o and the cam locks the shackle wherein the shackle will not come out even if the individual key operates the other cylinder thereby denying the access to operator or individual key. PRIOR ART A padlock is known in Indian patent and is basically single key or dual key operated. Such locks have in the past been sold with lock cylinders operable by single key and / or two keys are required simultaneously to open and close the padlock. This type of padlocks do not have override or access control feature in it, so that one key will have control on other key i.e. one key will allow or disallow opening of the padlock by other key thereby having control on it. The term access control will be understood to mean that if a person (master) suspects the other person (slave or operator) which is regularly operating the padlock with his key or key is lost and it is suspected that it has been acquired by an unauthorised person, it is possible to stop the access by the said key (i.e. lost key or slave key). Often in normal padlocks, nothing can be done to avoid the misuse of lost key and / or we cannot stop / restrict the access of an unwanted person. Usually these locks are required to be replaced by new ones which becomes expensive than the said innovative access control padlock. 2 SUMMARY OF THE INVENTION The principle object underlying the present invention is to provide access control feature / facility in a padlock and indeed to ensure that the lock cannot be opened without someone's consent to ensure that the lock is secured against tampering by an unauthorized person. fnorder to satisfy the above object there are provided two different key cylinders operable by separate keys which further includes cams biased into position of cylinder core, which are adapted to be engaged with complementary recesses on shackle, in locked position. Because the cams are engaged independently with the shackle member they control the opening of shackle independently by the different key cylinders. When the first key cylinder is operated and the second cam is in unlocked condition, the lock behaves as a single key lock i.e. as a normal padlock available in the market. Whereas, when the second cam is rotated into locked position of the other shackle limb end, it overrides the access of the first key i.e. if at all first key cylinder is operated and the cam be rotated to unlocked position, shackle will not come out of the housing as it is held in locked position by the second cam. This means that the access of the first key is controlled by second key thereby providing a access control facility in the padlock. The above and other features of the invention, and advantages deriving there from, will appear evident from the following detailed description of the preferred embodiments made with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWING FIG 1 : Shows the view of the front side of the padlock in accordance with the invention FIG 2 : Shows the basic views of the present invention. FIG 3 Shows the sectional view along the sectional line AA of Fig 2 of present invention. FIG3B : Shows the sectional view along the sectional line AA of Fig 2 when the keys are inserted in the cylinders. FIG3C : Shows the sectional view along the sectional line AA of Fig 2 in open condition of the shackle. FIG 4 : Shows the sectional view along the sectional line BB of Fig 2 in locked condition of the shackle FIG 5 : Shows the exploded view of the present invention. FIG 6 : Shows the exploded view of the key cylinder. FIG 7 : Shows the different views of the housing of said invention. FIG 8 : Shows the different views of the shackle of the present invention. FIG 9 : Shows the different views of the retainer cap of the present invention. FIG 10 : Shows the different views of a cam of the present invention. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Turning now to figure 1 to 10, there can be seen a padlock having a lock housing (1) which is oval shaped and having the open ended chambers (lc & Id) along the cross section to receive key cylinders (3 & 4) and guide bore (la) and cutout (lb) to receive the 'U' Shaped shackle, key cylinders (these are the standard locking cylinders manufactured by M/s. Godrej & Boyce Mfg Co. Ltd, Mumbai, but any other key cylinder with required modifications can be used). The lock can be opened by inserting a key (5) into the key cylinder (4) and turning key 90° in clockwise direction thereby rotating the cam (7) by 90° and aligning the surface (7a) of the cam (7) in orientation with the surfaces (2a) of the shackle (2) thereby allowing the shackle to move out of the cam (7). The groove (2c) and (2d) are provided on the shackle (2) which are adapted to be engaged with the cam surface (7c) when the cam surfaces (7a) is oriented 90° to the shackle surfaces (2a & 2b) respectively. Cams (7 & 8) are rotatably engaged with key cylinder plugs (9 & 10), a recess (7d) is formed on the cam periphery to accommodate a pin (20) rigidly fixed into the cylinder housing (11). This restricts the rotation of a cam 90° clockwise and anti-clockwise. A cam (7) is also provided with a rib (7b) at bottom adapted to be engaged with a recesses (9a & 10a) of locking cylinder (9 & 10). A retaining cap (14) is provided to rotatably retain the shackle (2) with the housing (1) wherein provided a axial bore (14a) to reciprocatively guide the shackle and a bore (14b) to rotateably retain the retainer pin (13), secured to the shackle (2) by the screw means (18) fixed into the threaded recess (2e) of the shackle (2). The said retainer cap is retained with the housing by screw means (19) passing through the bores (le) of the housing (1). A screw means (17) adapted to be engaged with the recess (11a) and inserted through bore (If) is provided to secure the key cylinder (4) with the housing (1). A spring baised plug (15) adapted to be engaged with recess (12e) of the key cylinder housing (12) is provided to secure the another key cylinder (3) with the lock housing (1). A spring (16) housed into the bore (If) is provided to retain a pin (15) in the recess (12e). A recess (10a) is provided on a locking cylinder plug (09) which is adapted to be engaged with a rib (7b) of a cam (7). A key (6) is inserted into locking cylinder (3) and the plug (10) is rotated through 360° thereby rotating a cam (8) through 90° as the projection (10a) has got 270° free rotation before engaging with a rib in clockwise or anti-clockwise direction. Refering to Figure 6a, a key cylinder comprise of plug (9) having bores (9c) to accommodate operating pins (22), a slot (9a) and a groove (9b) to engage with the wedge (21) a housing (11) having corresponding bores (lid) to plug (9) for accommodating driver pins (23) and springs (24), a pin (20) integrally fitted with cylinder housing (11) through a bore (lib), a sleeve (25) 4 having slot (25a) to hold the springs in place and a wedge (21) inserted through a slot (lie) extending into groove (9b) for retaining plug and housing in place. When a key (5) is inserted into key cylinder the pins are aligned along the shear line thereby making cylinder plug free to rotate with respective to cylinder housing wherein in turn it rotates the cam (7), when key is retracted driver pins enter into cylinder plug bores and lock the cylinder plug with respect to cylinder housing. 5 WE CLAIM : 1. A padlock comprising of lock housing generally oval shaped rectangle, two opening chambers formed in said housing having entry side and close side, a concentric guide bores formed at bottom side of one of the said chambers, a cutout formed in bottom side of the other chambers, a screw fixing means guide hole formed across the said chambers, a shackle slideably moveable in the said guide bores between an open position in which said shackle is retracted out of said housing and rotating on one of the limbs thereby allowing the free end to be inserted into lockable object, and closed position in which shackle is partly inserted into a locking cam through a guide bore and closes off the entry side, a key cylinder, means for integrally fixing the key cylinder to said housing, second key cylinder, means to integrally fix the second key cylinder to said housing, a cam rotateably connected to the cylinder and having abutment projection engageable with said shackle to lock the shackle into said housing, a second cam partially rotateable connected to second cylinder and having abutment projection engageable with the second shackle limb, to lock the shackle in said housing, a retaining cap slideably and rotateably guiding the said shackle and retainng the same shackle at the other end when the shackle is in open position, a retainer pin fixed to said shackle and having projecting portion to arrest the shackle against the said retainer cap when retracted out fully to open position of the shackle, mounting means for said retainer cap. 2. A padlock in accordance with claim 1, wherein a first cam member is provided which is aligned with a flat surfaces of shackle at one end in open position, and abutment provided on the cam engages with the complementary recesses provided in the said shackle end when the said cam is in locked position. 3. A padlock provided in accordance with claim 1, wherein a second cam member is provided which is aligned with flat surfaces of shackle at other end and abutment provided on second cam engages with the complementary recesses provided on the other shackle end when the said second cam is in locked position. 4. A padlock in accordance with claim 1, wherein a first key cylinder provided with a engageable portion of a plug which engages with the said first cam thereby turning the cam from locked position to unlocked position and vice versa when the said key is turned through 90° 6 5. A padlock in accordance with claim 1, wherein the second key cylinder provided with a engageable portion of a plug which engages with a said second cam thereby turning the cam from locked position to unlocked position and vice versa when the said key is turned through 360°. 6. A padlock in accordance with claim 4 & 5, wherein said key cylinder has first and second ends with key insertion opening at first end and having dog at second end, wherein said cam member has a complementary rib at inner periphery for engaging with key cylinder for transmitting torque to said cam on rotation of said key wherein a integral pin is fitted which extends into complementary recess in to the said first and second cam thereby restricting the cam rotation to lock and unlocked position. 7. A padlock in accordance with claim 1, wherein a shackle member generally 'U' shaped with 2 limbs having two ends with abutment and recesses, complementary to the abutment on cam members which are arrested with each other when in locked position and get aligned with each other when in unlocked position thereby allowing the shackle to retract out of the housing and closing off the shackle into housing. 8. A padlock in accordance with claim 1, comprising a housing having a fixing means guide holes, a first key cylinder and second key cylinder, shackle member moveable through the said guide bores in between open and closed position, a first cam member and a second cam member mounted on respective key cylinder, retainer cap mounted onto housing through mounting means, mounting means for key cylinders, turning the first cam member, when second cam member is in unlocked position permits the shackle movement through said housing and restricting the said shackle movement when the second cam is turned to its locked position by respective key cylinder, thereby having a control on first key cylinder access. Dated this 18th day of October, 2006 HIRAL GHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. 7 ABSTRACT : A access control padlock comprises of a housing wherein two chambers open at one end having entry side for key cylinders, a guide bores defined within the said chamber, at opposite end, a shackle rotatably slideable within the said bores, between open and closed position, where it is retracted out of housing and free to rotate about a limb retained into retainer cap and closed position wherein the open end is pushed into the housing and extends inside the cam, a first key cylinder and second key cylinder, means to fix the said key cylinders, the cams moveable by said key cylinders and having abutment projections adapted to be engaged and disengaged with complimentary recesses formed into shackle limb ends, wherein first cam is engaged with shorter limb end in locked position and disengages the same in unlocked position, the said cam is always in locked position wherein the key is removed from the said first key cylinder, when the key is inserted into first key cylinder and rotated through 90° clockwise, the said cam disengages with the shackle thereby allowing the shackle to move to open position of the said lock, a second can fitted partially moveable by the second key cylinder wherein a key can be inserted and removed in both the locked and unlocked positions of the second cam, this locks the second longer limb of the shackle, the said cam is always in disengagement with shackle limb to permit the lock to operate normally with the first key cylinder, when the said second key is inserted into said second cylinder and turned through 360° clockwise thereby rotating the said second cam through 90° clockwise which engages with the complimentary recesses provided on second limb of the shackle thereby providing the locking of second limb and key removed from the locking cylinder, the closing and opening of the shackle by the first key cylinder is prevented, thus the second key cylinder overrides the access of first key cylinder and makes it redundant, a retaining cap mounting means for said retainer cap, shackle retainer pin and fixing means for said retainer pin. To The Controller of Patents & Designs, The Patent Office, Mumbai. 8 Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : / / No. of Sheets -.10 Sheet No. :01 FIG 1 HIRAL CHXNDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant Appl. No. GODREJ & BOYCE MFG. / / CO. LTD. No. of Sheets :10 Sheet No. :02 A A ■"T HIRAL CHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : / / No. of Sheets :10 Sheet No. :03 SECT.:-A-A, REF. FIG. 2 SECTIONAL VIEW IN LOCKED CONDITION FIG 3A HIRAL CliANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : / / No. of Sheets :10 Sheet No. :04 SECT.:-A-A, REF. FIG. 2 SECTIONAL VIEW WHEN KEY IS INSERTED FIG 3B HIRAL CKANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : / / No. of Sheets :10 Sheet No. :05 SECT..--A-A, REF. FIG. 2 SECTIONAL VIEW IN UNLOCKED CONDITION FIG 3C HIRAL CHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD, Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. NO. : / / No. of Sheets Sheet No. SECT.:-B-B, REF. FIG. 2 SECTIONAL VIEW IN LOCKED CONDITION FIG 4 HIRAL QHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD, Appl. No. : / / No. of Sheets :10 Sheet No. :07 EXPLODED VIEW FIG 5 HIRAL CHANDRAKANT JOSHI [GENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : II No. of Sheets :10 Sheet No. :08 EXPLODED VIEW FIG 6 HIRAL CHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD, Appl. No. : / / No. of Sheets :10 Sheet No. :09 HIRAL CHANDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD. Applicant : GODREJ & BOYCE MFG. CO. LTD. Appl. No. : / / No. of Sheets :10 Sheet No. :10 FIG 8 FIG 9 FIG 10 HIRAL ChNDRAKANT JOSHI AGENT FOR GODREJ & BOYCE MFG. CO. LTD.

Documents:

1729-MUM-2006-ABSTRACT(8-11-2011).pdf

1729-MUM-2006-ABSTRACT(GRANTED)-(29-10-2012).pdf

1729-mum-2006-abstract.pdf

1729-mum-2006-abstract1.jpg

1729-MUM-2006-CANCELLED PAGE(8-11-2011).pdf

1729-MUM-2006-CLAIMS(AMENDED)-(8-11-2011).pdf

1729-MUM-2006-CLAIMS(GRANTED)-(29-10-2012).pdf

1729-mum-2006-claims.pdf

1729-mum-2006-correspondence(28-9-2007).pdf

1729-MUM-2006-CORRESPONDENCE(IPO)-(29-10-2012).pdf

1729-mum-2006-correspondence-others.pdf

1729-mum-2006-description(complete).pdf

1729-MUM-2006-DESCRIPTION(GRANTED)-(29-10-2012).pdf

1729-MUM-2006-DRAWING(GRANTED)-(29-10-2012).pdf

1729-MUM-2006-FORM 1(8-11-2011).pdf

1729-MUM-2006-FORM 18(28-9-2007).pdf

1729-MUM-2006-FORM 2(GRANTED)-(29-10-2012).pdf

1729-MUM-2006-FORM 2(TITLE PAGE)-(8-11-2011).pdf

1729-MUM-2006-FORM 2(TITLE PAGE)-(GRANTED)-(29-10-2012).pdf

1729-mum-2006-form-1.pdf

1729-mum-2006-form-2.doc

1729-mum-2006-form-2.pdf

1729-mum-2006-form-3.pdf

1729-MUM-2006-REPLY TO EXAMINATION REPORT(8-11-2011).pdf

1729-MUM-2006-SPECIFICATION(AMENDED)-(8-11-2011).pdf