Title of Invention

CIRCULAR SHACKLE PADLOCK

Abstract

A Circular Shackle Padlock comprises of a solid lock housing of a barrel shape, having locking cylinder entry side at bottom and shackle retainer entry side at top along with shackle guiding cutouts on the periphery; a shackle moveable within said guide cutouts between open position & closed position, when a shackle retainer is in retracted position in said housing which frees the guiding cutouts, a lock cylinder, means to fix said lock cylinder in said lock housing, a cam moveable by said lock cylinder in said housing having an abutment portion engageable with a complimentary recess on locking bolt which is pivotally secured with said shackle retainer and moveable in the axial cavity out made into the said housing, to lock the shackle with the said housing, a holder plate secured to said housing to retain a locking bolt within the said housing when the said bolt is unlocked condition, means to secure retainer plate with said housing, a shackle member moveable into said shackle retainer through said guide recesses when in retracted position and disallowing the said shackle movements when is in locked position.

Full Text

FORM 2 THE PATENT ACT 197 0 (39 of 1970) The Patents Rules, 2003 COMPLETE SPECIFICATION (See Section 10, and rule 13) 1. TITLE OF INVENTION CIRCULAR SHACKLE 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 MAHARASHTRA PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner in which it is to be performed : - CIRCULAR SHACKLE PADLOCK FIELD OF INVENTION The present invention relates to a pin tumbler padlock comprising a barrel shaped lock housing and having a shackle guide cut out defined within the housing, a shackle moveable within said cutout between open position in which shackle is rotated so as to bring the shackle opening out of the housing and close position in which the shackle opening is rotated inside the housing and closes off the opening cutout, a lock cylinder, means to securely fix the cylinder in said housing, a cam moveable by said cylinder and having a recess engageable with a complementary recess of a locking bolt to prevent the rotation of said shackle with respect to a said housing. PRIOR ART The padlock available nowadays have a typical disc, square, rectangular or elliptical shaped housing and 'U' shaped shackle which is reciprocable or pivotly held with the said housing. These are generally single locking or double locking type. These locks have sheet metal or solid construction with welding or rivets visible from outside thereby restricting the construction material to stainless steel or brass to avoid additional finishing processes. This also limits various finishes to be imparted on to the lock. Further more the initial assembly is rather complicated which increases the cost of manufacturing and all the locks look more or less similar in aesthetic. SUMMARY OF THE INVENTION The principle object of the invention is to provide an alternative way of making known padlocks aesthetically appealing and with solid jointless, rivetless construction and to ensure that the lock is easy to assemble during manufacturing to ensure that a lock can be made in any desirable finishes without any restriction on material used such as brass or stainless steel, to ensure that the lock is secured against tampering by an unauthorized person. 2 The invention is particularly directed to overcome the limitations of finish of the padlock. Another object of the invention is to overcome the limitations of materials to be used for construction of a padlock. Further object of the invention is to avoid joints, rivets, welded joints which are present in the existing padlock construction, which often gives the feeling of weak construction and also put limits on the finish to be imparted on outside of the padlock. BRIEF DESCRIPTION OF THE DRAWING FIG 1 : Shows the perspective view of the lock of present invention FIG 2 : Shows the basic views of the present invention. FIG 3A : Shows the sectional view of the lock of present invention along the sectional line AA of Fig 2 of present invention in locked condition of a shackle. FIG3B : Shows the sectional view of the lock of present invention along the sectional line AA of Fig 2 when the key is inserted in the cylinder and shackle is in locked condition. FIG3C : Shows the sectional view of the lock of present invention along the sectional line AA of Fig 2 in unlocked condition of the shackle. FIG 4 : Shows the exploded view of the lock of present invention FIG 5 : Shows the different views of shackle of padlock of present invention. FIG 6 : Shows the different views of locking bolt of padlock of present invention. FIG 7 : Shows the different views of shackle retainer of padlock of present invention. FIG 8 : Shows the different views of cam of padlock of present invention. FIG 9 : Shows the different views of housing of padlock of present invention. 3 DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring to Fig 1 to 9, a padlock of present invention comprises of the lock housing (1), the said housing can be made from any desired material such as brass, steel, stainless steel, plastic, mazak etc, which is rigid, strong and resistant to tampering or external attack. In addition it will have sufficient structural strength to resist such tampering and to support and house the mechanism and operative elements of the padlock due to its solid construction. The lock housing is made in barrel shape and comprises of a opening (la) at the bottom side and another opening (lb) at the top side to receive locking cylinder assembly (100) and shackle retainer (2) respectively, it also comprises of a central cutout (lh ) to house and guide the locking bolt member (3), the bores (lc & Id) to receive the fixing means (4a & 4b) to secure a bolt retainer plate (5) with the said housing, a bore (le) across the housing axis to receive fixing means (6 & 7) to secure the locking cylinder assembly (100) to the said housing (1), the peripheral cutouts (If & lg) to guide the shackle member (8) when rotated from open condition to close condition as shown in Fig 3b & 3c. The padlock of the present invention having shackle member (8) which comprises of a opening (8a) for engaging the object/ objects to be locked, the abutment (8b & 8c) adapted to be engaged with the inner surface (li) of the said housing at the bottom edge of the cutouts (If & lg) when the bolt member (3) is in locked position. The padlock of the present invention having shackle retainer (2) which comprises of a recess (2a) to retain the rotatably moveable shackle (8), a bore (2b) to receive a pivoting means (9) which pivotably connects the locking bolt member (3) with the said shackle retainer, the recesses (2c & 2d) to accommodate the retainer plate (5) when in locked condition. The padlock of the present invention having locking bolt member (3) which comprises of recess (3a) to guide the shackle member (8) when rotated from open condition to closed condition, a hole (3b) to receive the pivoting means (9), a groove (3c) adapted to be engaged with the cam (10), the profiled surfaces (3d & 3f) which are oriented with the cam surfaces (l0d & l0e) to facilitate the movement of the bolt into the said cam (10). 4 The padlock of the present invention having retainer plate (5) which comprises of a cutout (5a) to receive the said locking bolt profiled end, the plate is inserted into said profiled bolt end and turned by 90° so that the said bolt end will not come out in this position, the threaded holes (5b & 5c) to receive fastening means (4a & 4b) to securely fasten the said retainer plate to said lock housing so that the bolt member will not come out but can only move inside and outside of the cam within desired displacement through the axial cutout (lc). The padlock of the present invention having a cam (10) which comprises of a recess (10a) to accommodate a locking bolt member (3), a counterbore (10b) which is adapted to engage with profiled end of the locking bolt (3) and also receives the locking cylinder end, a recess (10c) to accommodate the stopper pin (11) integrally fitted to locking cylinder housing (12) when the cylinder is rotated by key member (14), the pin (11) restricts its rotation to 90° so as to orient the surfaces (l0d & l0e) of cam (10) with the profiled end of the locking bolt thereby allowing its movement in an out of the said cam, a dog (l0f) adapted to be engaged with the cutout provided in the cylinder (13 ) of locking cylinder assembly (100). The padlock of the present invention having the locking cylinder assembly (100) [this is a standard component of M/s. Godrej & Boyce Mfg Co Ltd, Mumbai, India used in many Ultra Locks], which comprises of the components such as housing (12), cylinder (13), key member (14), operating pins (17), driver pins (15), springs (16) and sleeve (18). This works in a general manner wherein the pin pairs are aligned across the shear line of cylinder and housing shown in Fig 3b & 3c as per the indents (dimples) made on the key member at specified positions. A unique key is made by changing the positions of the indents (dimples) of different depths and the locking cylinders are made by filling the corresponding pin pair into corresponding bores of the housing and cylinder. When a key is inserted into a cylinder as shown in Fig 3b pin pair gets aligned along the shear line thereby allowing the cylinder (13) to rotate with respect to housing (12) within desired angular displacement of 90° which in turn rotates the cam (10) as shown in Fig 3c which is a unlocked position of locking bolt (3) wherein it is pulled out of a cam which allows shackle retainer (2) to move through the 5 desired displacement thereby making shackle member free to rotate from its closed position to open position and vice versa. From the foregoing, it will be seen that this invention is one well adapted attain all of the ends and objects herein above set forth together with other advantages which are obvious-and inherent in the lock. It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims. As many possible embodiments may be made of the invention without departing from the scope thereof. It is shown in the accompanying drawings is to be interpreted as illustrative and not in limiting sense. 6 WE CLAIM : 1 Padlock comprising the barrel shaped housing, an interior cavity is formed in said housing and having an entry side at both ends; a guide cutouts defined in periphery of top cavity formed within said housing, a shackle moveable within the said guide cutout between open position in which the said shackle is rotated to move the shackle opening out of the said housing to insert into the object/s to be locked and closed position in which the shackle is rotated into the guide cutouts to move the shackle opening inside the housing thereby enabling the locking of said shackle with the said housing, a lock cylinder, means to securely mount the said lock cylinder in said housing, a cam moveable by said lock cylinder having an abutment projection to engage with locking bolt complimentary recess provided on a profiled end, a lock bolt member oriented with the said cam and moveable within said housing interior cavity is locked when pushed inside the said cam which is rotated by 90° with the said cylinder by a key and vice versa, and means pivotly connecting the said locking bolt member with the shackle retainer, a shackle retainer moveably housed into interior cavity at top side which rotateably holds the said shackle, a retainer plate secured to said housing to hold lock bolt member in its unlock condition to retain the shackle retainer with the said housing and allowing to move inside it by a determined displacement so as to enable the shackle retainer to lift as the shackle is rotated in the said guide cutouts, means to secure the said retainer plate to said housing. 2 A padlock of barrel shaped housing having top opening for skackle retainer, locking bolt and retainer plate screwably fitted to the housing from the bottom opening; a cam with locking cylinder is fitted from the bottom which is fixed to the housing by a spring loaded retainer pin provided inside the barrel; said locking cylinder is operable by a key. 3 A padlock as claimed in claim 1 wherein said shackle of circular shape having a cutout to facilitate the entry of the shackle into object to be locked. 7 4 A padlock as claimed in claim 1 wherein the locking bolt is pivotably connected with shackle retainer. 5 Padlock as claimed in Claim 1, wherein a shackle is provided with a circular notch at the ends which is adapted to be engaged against the inner surface of the housing cavity in top side when pushed inside the housing along with the shackle retainer thereby preventing the movement of the shackle with respect to said housing. 6 Padlock as claimed in Claim 1, wherein said lock cylinder is provided with a recess to receive the said mounting means thereby preventing it from being removed out of the said housing and retain permanently inside the housing. 7 Padlock as claimed in Claim 6, wherein said lock cylinder has first and second ends with key insertion opening at said first end and having a cut out at the second end adapted to be engaged with a dog provided on a the inner surface of a axial counter bore of a cam to make it rotate along with the cylinder. 8 Padlock as claimed in Claim 7, wherein said cam member has a axial counter bore formed at one end and a cross recess at other end to create a cavity for the profiled end of locking bolt end and parallel recess formed at the other end to guide the said profile end of the locking bolt only if oriented with the flat faces of cam and locking bolt, wherein the profiled end gets locked inside the cam ones the locking bolt is inserted into it and cam is turned through 90° wherein the flat surfaces are perpendicular to each other thereby preventing the axial movement of the locking bolt thus providing the locked condition and vice versa. 9 Padlock as claimed in Claim 1, wherein said a shackle retainer is provided with a recess which allows the shackle to move freely when in open position and retains the shackle with it. 8 10 Padlock as claimed in Claim 9, wherein the shackle retainer is provided with a radial bore to receive pivotally connecting fixing means and recess is also provided on the open end of said recess to accommodate a retainer plate when the locking bolt is in locked position. 11 Padlock as claimed in Claim 1, wherein a locking bolt is provided with a profiled end adapted to be engaged with the complementary recess of the said cam member in locked position and facilitates its movement in unlocked position thereby making shackle and shackle retainer to move by predetermined displacement thereby making shackle disengaged from the notches of housing at top recess thus allowing the shackle to rotate in the shackle retainer from closed position to open position and vice versa. 12 Padlock as claimed in Claim 11, wherein a locking bolt is profiled at the bottom end to move in and out of the said cam when oriented with the cam surfaces. 13 Padlock as claimed in Claim 1, wherein the said shackle, shackle retainer, locking bolt are retained by the said retainer plate with the said housing in both locked and unlocked condition. THOTTUVAI SIVASUBRAMANI MURALI GENERAL MANAGER DESIGN & ENGINEERING LOCKS DIV. GODREJ & BOYCE MFG. CO. LTD. 9 Dated this 21st day of March, 2007. ABSTRACT A Circular Shackle Padlock comprises of a solid lock housing of a barrel shape, having locking cylinder entry side at bottom and shackle retainer entry side at top along with shackle guiding cutouts on the periphery; a shackle moveable within said guide cutouts between open position & closed position, when a shackle retainer is in retracted position in said housing which frees the guiding cutouts, a lock cylinder, means to fix said lock cylinder in said lock housing, a cam moveable by said lock cylinder in said housing having an abutment portion engageable with a complimentary recess on locking bolt which is pivotally secured with said shackle retainer and moveable in the axial cavity out made into the said housing, to lock the shackle retainer with the said housing, a holder plate secured to said housing to retain a locking bolt within the said housing when the said bolt is unlocked condition, means to secure the retainer plate with said housing, a shackle member moveable into said shackle retainer through said guide recesses when in retracted position and disallowing the said shackle movement when is in locked position. To, The Controller of Patents, The Patent Office, Mumbai. 10

Documents:

706-MUM-2007-ABSTRACT(23-11-2012).pdf

706-MUM-2007-ABSTRACT(29-3-2011).pdf

706-MUM-2007-ABSTRACT(GRANTED)-(14-1-2013).pdf

706-mum-2007-abstract.doc

706-mum-2007-abstract.pdf

706-MUM-2007-CANCELLED PAGES(29-3-2011).pdf

706-MUM-2007-CLAIMS(AMENDED)-(23-11-2012).pdf

706-MUM-2007-CLAIMS(AMENDED)-(29-3-2011).pdf

706-MUM-2007-CLAIMS(GRANTED)-(14-1-2013).pdf

706-mum-2007-claims.doc

706-mum-2007-claims.pdf

706-mum-2007-correspondence(19-9-2007).pdf

706-MUM-2007-CORRESPONDENCE(23-10-2012).pdf

706-MUM-2007-CORRESPONDENCE(23-11-2012).pdf

706-MUM-2007-CORRESPONDENCE(IPO)-(14-1-2013).pdf

706-mum-2007-correspondence-received.pdf

706-mum-2007-description (complete).pdf

706-MUM-2007-DESCRIPTION(GRANTED)-(14-1-2013).pdf

706-MUM-2007-DRAWING(29-3-2011).pdf

706-MUM-2007-DRAWING(GRANTED)-(14-1-2013).pdf

706-mum-2007-drawings.pdf

706-MUM-2007-FORM 13(23-11-2012).pdf

706-MUM-2007-FORM 18(19-9-2007).pdf

706-MUM-2007-FORM 2(GRANTED)-(14-1-2013).pdf

706-MUM-2007-FORM 2(TITLE PAGE)-(GRANTED)-(14-1-2013).pdf

706-MUM-2007-FORM 26(23-11-2012).pdf

706-mum-2007-form-1.pdf

706-mum-2007-form-2.doc

706-mum-2007-form-2.pdf

706-mum-2007-form-3.pdf

706-MUM-2007-GENERAL POWER OF ATTORNEY(29-3-2011).pdf

706-MUM-2007-MARKED COPY(23-11-2012).pdf

706-MUM-2007-REPLY TO EXAMINATION REPORT(29-3-2011).pdf

706-MUM-2007-REPLY TO HEARING(23-11-2012).pdf

706-MUM-2007-SPECIFICATION(AMENDED)-(23-11-2012).pdf

706-MUM-2007-SPECIFICATION(AMENDED)-(29-3-2011).pdf