US 3613409 A
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Oct. 19, 1971 J. PAIOLETTI 3,613,409
PADLOCKS Filed Jan. 5, 1970 2 Shoots-Sheet 1 IIIIIII gj INVENTOR JOSE PAIOLETTI ATTORNEY Oct. 19, 1971 Filed Jan.
J. PAIOLETTI PADLOCKS 2 Sheets-Sheet 2 INVENTOR. JOSE PAOLETTI ATTORNEY United States Patent 3,613,409 PADLOCKS Jose Paioletti, Av. Alcantara Machado, 884-886 Sao Paulo, Brazil Filed Jan. 5, 1970, Ser. No. 561 Int. Cl. E05!) 67/22 US. CI. 70-38 A 1 Claim ABSTRACT OF THE DISCLOSURE A lock having a casing provided with two parallel recesses for receiving the legs of a U-shaped shackle, and a locking block which controls the positioning of a locking bolt. Each of the shackle legs is provided with a slot having at least one surface which is oblique with respect to the longitudinal axis of the parallel recesses. The positionable loeking bolt has a portion which complements the slot in the shackle legs to selectively and securely lock the shackle against undesired movement with a double locking effect.
The present invention relates to a lock having outstanding security features, and in particular relate to an improved padlock which is provided with predetermined shaped internal slots which complement a movable and positionable locking bolt.
BACKGROUND OF THE INVENTION It is known that conventional padlocks have U-shaped shackle members with two parallel legs. One of the legs normally rests on a spring positioned in a longitudinal side lodgment. The other of the legs is permitted to be fastened in a short opposite recess or lodgment. Both legs of the shackle member are provided with internal rectangular indentations which, by means of turning of a key for a lock, accommodate rectangular prismatic bolts which are driven or moved by an eccentric shaft provided into the locking block.
Such conventional padlocks, in spite of the apparent double locking effect, are readily violable by tapping the side of the casing at a point where the locking bolts are located. Such tapping causes the axial displacement of the locking bolts one after another until the shackle member is free to move and unlock.
The improved padlock provided by the present invention was designed specifically and purposely to eliminate once and for all the possibility of an unauthorized opening of the look. In accordance with the present invention, once the lock has been locked, that is to say, when the locking bolts are driven or moved by the locking block and into the pre-established and predetermined shaped internal slots on the inside of the lower extremity of the shackle leg, then the actual removal of the locking bolt is not possible by tapping the outside of the locked casing. On the contrary, if the casing is tapped, the fastening stem will undergo a stronger blockage or locking.
SUMMARY OF THE INVENTION The present invention provides a lock having a casing provided with two parallel recesses and at least one positionable locking bolt. A selectively movable locking block controls the positioning of the locking bolt. There is also provided a shackle member having a first leg which may be introduced into one of said parallel recesses and having a second leg which may be introduced into the other of said two parallel recesses. At least one of the shackle legs is provided with a slot having at least one surface which is oblique with respect to the respective longitudinal axis of the two parallel recesses. The positionable locking bolt has a portion shaped to mate or complement with the slot 3,613,409 Patented Oct. 19, 1971 in the shackle leg to selectively and securely lock the shackle against movement.
BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION OF SOME PREFERRED EMBODIMENTS With reference to FIGS. 1 and 2 of the drawings, the improved padlock according to the present invention includes a casing 1 which is provided with two side lodgments or recesses 2 and 3, one of which is longer or deeper than the other. The look is also provided with a U-shaped shackle member 5. The longer leg of the shackle member 5 is rotatably and resiliently supported by a helicoidal spring 4 disposed in the deeper side lodgement or recess 2. The other leg of the shackle member 5 fits in the other side lodgement or recess 3. Both legs of the shackle member 5 may be provided with slots 8 on their internal sides within which slots 8 movable prismatic locking bolts 9 may fit. The locking bolt 9 may be driven through axial movement by a locking block 6 operated by means of a key 7.
A vital and very important feature of the present invention resides in the internal slots 8 provided at the lower end of the U-shaped shackle member 5. It is important to note that each slot 8 has an L-shaped or figured longitudinal section with the longer side substantially arcuate, and the shorter side forming an acute angle with the longer side.
The prismatic locking bolts 9 mate or -fit into the internal slots 8. The registering surface of the prismatic locking bolts 9 has a trapezoidal section with its bottom side having an angular inclination which is complementary to that of the shorter side of the internal slot 8 in the shackle legs. This produces a double fastening lock.
An important feature of the invention resides in the fact that the internal slots 8 in the shackle member 5 have at least one surface which is oblique to the longitudinal axis of the recesses or lodgments 2 and 3. In other embodiments of the invention, it is possible for this oblique surface to be inclined at any angle relative to the longitudinal axis of the recess 2 or 3, and in other embodiments may form acute or even obtuse angles with the longer side of the slot 8.
It is also possible to achieve the advantages of the present invention by placing the predetermined shaped slots 8 on opposite sides of the shackle member 5. For example, one slot 8 may be placed facing the internal portion of the U-shaped shackle member 5, and the other slot 8 on the opposite leg of the shackle member 5 may be placed on the external surface of the shackle member 5. In another possible embodiment of the invention, the slots 8 may both be placed on the outer surfaces of the legs of the shackle member 5 to face in opposite directions and not face each other.
It should be noted that the locking and opening of the lock according to this invention is identical to the opening and closing of conventional locks. In other words, to lock or close the locking according to the present invention, the U-shaped shackle member 5 is pressed downwardly which forces the locking bolts 9 inwardly until registration of the end of the locking bolt 9 takes place with the slot 8, and at that point the prismatic locking bolts 9 fit or snap into the slots 8 to securely close the padlock.
1. A padlock comprising, in combination:
a casing provided with two parallel recesses;
two positionable locking bolts;
a selectively movable locking block which controls the positioning of both of said positionable locking bolts;
21 shackle member having a first leg which may be introduced into one of said two parallel recesses and having a second leg which may be introduced into the other of said two parallel recesses;
said first leg of said shackle member being provided with a slot having at least one surface which is disposed obliquely with respect to the respective longitudinal axis of said two parallel recesses;
said second leg of said shackle member being provided with a slot having at least one surface which is disposed obliquely with respect to the respective longitudinal axis of said two parallel recesses;
said slot provided in said first leg of said shackle member includes an acute dihedral angle, and its associated obliquely disposed surface forms part of said acute dihedral angle;
said slot provided in said second leg of said shackle member includes an acute dihedral angle, and its obliquely disposed surface forms part of said acute dihedral angle;
a helicoidal spring disposed in one of said two parallel recesses;
said shackle member is a U-shaped shackle element which is freely supported on said helicoidal spring disposed in one of said two parallel recesses;
each of said two parallel recesses being cylindrical in shape;
ROBERT L. WOLFE,
said two positionable locking bolts each being constrained to slide in a straight line path which is substantially perpendicular to said longitudinal axis of said two parallel recesses and each having a registering portion in the shape of a trapezoidal section with its lowermost side having an angular inclination which is complementary to that of said obliquely disposed surface of its respective associated one of said slots;
each of said positionable locking bolts being prismatic in shape and being constrained to slide parallel to its longitudinal axis;
said slots in said shackle legs face each other and mate with said positionable locking bolts;
said facing slots each having a substantially L-shaped longitudinal section consisting of said oblique surface which is inclined toward the opposite leg and a second surface which is arcuated;
whereby said slots are designed to match the positionable prismatic axially sliding bolts to produce a double locking effect.
References Cited UNITED STATES PATENTS 421,966 2/1890 Peacock 70-38 957,033 5/1910 Bruyckar 70-38 991,796 5/1911 Murawski 7038 1,246,287 11/1917 Lemon 7038 2,691,288 10/1954 Childs 70-38 2,726,531 12/1955 Vile 7038 3,254,516 6/1966 Tornoe 7038 Primary Examiner