Classifications

• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B27/00—Cylinder locks or other locks with tumbler pins or balls that are set by pushing the key in
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B17/00—Accessories in connection with locks
  • E05B17/0004—Lock assembling or manufacturing
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B17/00—Accessories in connection with locks
  • E05B17/0054—Fraction or shear lines; Slip-clutches, resilient parts or the like for preventing damage when forced or slammed
• • E—FIXED CONSTRUCTIONS
  • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
  • E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
  • E05B17/00—Accessories in connection with locks
  • E05B17/0054—Fraction or shear lines; Slip-clutches, resilient parts or the like for preventing damage when forced or slammed
  • E05B17/0062—Fraction or shear lines; Slip-clutches, resilient parts or the like for preventing damage when forced or slammed with destructive disengagement

Definitions

• Prior cylinder locks have included a plurality of tumbler pins and aligned driver pins urged by springs against the key.
• the pins are separately manufactured to selected lengths prior to lock assembly.
• the present invention comprises a cylinder having a body, a turnable plug, a shear line therebetween, and a plurality of selectively weakened assembly pins for initial positioning by a notched key.
• the assembly pins are sheared by the manufacturer or locksmith using special machinery to thereafter function as both driver and tumbler pins.
• Such assembly pins are strong enough so that torquing or otherwise forcing with an insertable key by the lock user or person with an unauthorized key or similar tool will not shear them.
• the assembly pins have a plurality of selectively weakened portions or zones to control shearings at selected points provided sufficient shearing force is applied.
• driver and tumbler pins are strong enough so that torquing of a key by hand or with a tool will cause the key or tool to fail before the pins shear.
• Fig. 1 is a side elevational cutaway view of the lock of the present invention including shell, plug and key-positioned assembly pins;
• Fig. 2 is a side elevational view of an assembly pin of the present invention
• Fig. 3 is a view similar to Fig. 1 in which the pins have been sheared by relative lateral movement between the shell and plug;
• Fig. 4 is a plan view of the apparatus for shearing the assembly pins and crimping the shell and plug together;
• Fig. 5 is an elevational view of the apparatus of Fig. 4;
• Fig. 6 is a partial sectional view along line 6-6 of Fig. i;
• Fig. 7 is a partial sectional view along line 7-7 of Fig. 6;
• Fig. 8 is an elevational view of the pin of a second embodiment
• Fig. 8a is an enlarged view of a pin groove of the pin of Fig. 8;
• Fig. 9 is a sectional view perpendicular to the horizontal axis of the plug without pins
• Fig. 9a is a sectional view similar to Fig. 9 with pins and with the plug slightly turned;
• Fig. 10 is a plan view of a second shearing mechanism, with a longitudinal axis A, for use at retail locations;
• Fig. 11 is a sectional view taken at ll-ii through longitudinal axis A of the mechanism of Fig. 10;
• Fig. 12 is a front elevational view of a key-operated padlock which is a further embodiment of the invention with the plug of the shell-plug assembly protruding;
• Fig. 13 is a side elevational view of the shell-plug assembly removed from the padlock of Fig. 12;
• Fig. 13a is a sectional view along 13a-13a of Fig. 13;
• Fig. 14 is a view similar to Fig. 13 in which the plug has been translated in direction Y;
• Fig. 15 is a view similar to Fig. 12 in which the shell- plug assembly, after translation, has been placed in the padlock;
• Fig. 16 is an enlarged sectional view along line 16-16 of Fig. 14.
• lock 10 includes a shell-plug assembly comprised of a cylinder shell 11, turnable cylinder plug 13, with plug collar 13c, and five (5) vertical pin passageways 14a-e extending up into shell as shell passageways 11 and down into plug 13 as plug passageways. Also shown are five assembly pins 15a-e, plug tail 12, brass key 16, cylinder shear line 18 and pin springs 20a-e for the assembly pins 15a- e.
• Each assembly pin 15a-e has eight (8) circumferential weakened zones defined by notches or grooves 17.
• Pins 15a-e are made of selected material and their grooves 17 are shaped and proportioned to accomplish assembly pin shearing by the manufacturer or locksmith while preventing compromise in security while the lock is in service through use of an unauthorized key or other instrument.
• Different manufacturers have differing non-notch key configurations which allow the keys of a given manufacturer to be inserted in locks of that manufacturer.
• Assembly pins of the invention are notched or otherwise selectively weakened to reduce the force taken to shear such pins; however, they are not weakened such that an insertable key (a key with the same keyway configuration on the lock key) with a different cut could be torqued by hand or by a tool to cause the driver and tumbler pins to shear prior to key or tool failure.
• the pin notches have a depth and shape such that only the force of factory or locksmith equipment applied to portions of the plug, and not applied to the key, can shear the pins. Forces applied to the key or directly to plug collar 13c in a direction parallel to the axis of rotation of plug 13 are resisted and absorbed by collar 13c engaging shell 11.
• Inner notch diameter (ND) was less than overall diameter or outside diameter D (see Fig. 2) .
• An inner notch diameter of 0.062 inch is preferred for padlock pins.
• D was 0.094 inch.
• Notch angle (C) was 20° (degrees) (Fig. 2) .
• the ratio of ND to D is preferably in the range 63%-74%.
• the present invention also includes door hardware pins where an inner notch diameter of 0.074 inch is preferred for pins having an outside diameter (D) of 0.114 inch.
• assembly pins 15a-e each with eight (8) weakened zones defined by circumferential grooves 17, are fabricated for use in making a quantity of locks.
• keys have eight (8) different cut depths and five pin cylinders, creating thirty- two thousand (32,000) combinations.
• Each groove 17 has a width w (Fig. 2) of about .0060-0.010 inches and the series of grooves 17 are spaced vertically (as shown in Fig. 2) about 0.0156 inch apart.
• assembly pins 15a-e (each of which is the same within a tolerance of + 0.0005) are placed into passageways 14a-e and then sheared.
• the series of spaced-apart grooves 17 are located in the assembly pins 15a-e such that they are positioned at the shear line 18 by a family of insertable keys.
• Fig. 3 illustrates plug 13 being driven to the right to shear pins 15a-e as further explained below.
• each assembly pin 15a-e breaks into an upper drive section 15u to function as a driver pin and aligned lower tumbler section 151 to function as a tumbler pin.
• Cylinder shell 11 has end ring portion 20 and plug 13 has angled portion 13a (Fig. 1) .
• a segment 2Op (Figs. 6 and 7) of ring portion 20 is crimped against portion 13a as later described.
• the pin shearing and crimping apparatus 30 includes lock fixture 31 with a configured aperture defining a lock holder recess 32.
• Lock 10 with its shell 11 and plug 13 and unsheared assembly pins 15a-e, is placed in aperture 32 with shell 11 abutting wall 32w.
• Plug tail 12 is engageable with shiftable shear pin 41.
• Shift shear pin 41 is shown in its rest position biased to the right as viewed in Fig. 4 by spring 42.
• shearing plunger 36 mounted in a cylindrical opening 37 of a stationary mount block 38, spaced from fixture 31.
• Apparatus 30 further includes a crimper unit 50 including a crimping ram 52 driven by a solenoid unit E.
• Crimp shift pin 54 is shown in its rest position biased away from the cylinder shell 11 by crimp pin spring 55.
• lock 10 including shell 11, plug 13, plug tail 12 and key 16, as an assembly, is placed in aperture 32 of fixture 31.
• Shear pin 41 is hit by shearing plunger 36 to apply force F to cylinder plug tail 12 to move plug 13 in direction Y.
• Pins 15a-e are thereby sheared (Fig. 3).
• Plug 13 is pushed back by hand, using key 16, to the original position.
• crimper unit 50 drives crimp shift pin 54 to crimp ring portion segment 20p of shell 11 against plug portion 13a (see Figs. 1, 6 and 7).
• each pin 60 of this embodiment has grooves or notches 61, for example, the ten (10) circumferential grooves 61a-j (shown in Fig. 8) .
• Each groove 61 has beveled surface areas or chamfers 63 to facilitate plug rotation and to make picking of the lock more difficult.
• Each chamfer 63 is sloped at angle C to a plane perpendicular to pin 60's longitudinal axis LA (Fig. 8a) .
• chamfer 63 is parallel to tangent line T which is perpendicular to radius R of plug 64 of shell-plug assembly 65 at the entrance edge of the plug pin passageway 71u (Fig. 9) .
• the selection of such a chamfer slope optimizes the ease of plug rotation.
• Distances from the bottom key-engaged end 60b of pin 60 to the center of each groove is set out in Table 1 (see also Fig. 8) .
• Each notch 61 is comprised of a portion of a notch a above plane Z perpendicular to longitudinal pin axis LA and a notch portion b below line Z.
• Plug 64 of shell-plug assembly 65 has a flat surface 66 positioned adjacent the upper shell section 67u of shell 67 to define a plug shear line. After shearing, and with the key (not shown) inserted, the formed tumbler pin 60t is raised which in turn raises the driver pin 60d. As plug 64 is turned in either direction (such as the counterclockwise direction; Fig. 9a) , groove chamfer surfaces 63 assist in free turning when the lower tumbler pin 60t is too high or the bottom of the upper driver pin 60d too low. Chamfer surfaces 63 reduce the likelihood that pins will catch the sides of shell and plug passageways 71u, 711 in either the shell or in the plug.
• a pin shearing mechanism 78 having body 79, housing cavity 81, a turnable drive unit 82 mounted in cavity 81 for rotation about the longitudinal axis A (Fig. 11) .
• Turnable unit 82 includes hand wheel 83 and nut 84 mounted in rotatable drive body 80.
• Nut 84 is turnable by a wrench (not shown) to turn drive unit 82.
• drive unit 82 As drive unit 82 is turned it translates plunger 87 through mating threads 88 on body 80 of unit 82 and threads 89 on plunger 87.
• Plunger 87 moves linearly in direction AA.
• Mechanism 78 includes lock holder recess 94 including shell support wall 94 which holds the shell-plug assembly 65 against translation in direction AA.
• the shell-plug assembly 65 is placed in holder recess 94, plunger 87 is advanced until it touches the plug 64 and a wrench is then used to turn nut 84 to translate plug 64 relative to its shell until the assembly pins 60 shear.
• handwheel 83 can be turned in the appropriate direction to rotate drive unit 82 and thereby translate plunger 87 in a direction opposite direction AA. This releases the shell-plug assembly 65 for removal from the mechanism 78.
• Example A door lock constructed of five (5) assembly pin passageways 71u, 711, defined by aligned shell and plug passageways and assembly pins 60 will, as explained, have each pin 60 sheared to form a pin set (a tumbler pin 60t and driver pin 60d in tandem) .
• Each assembly pin 60 has an outside diameter D of .114 inches and a reduced weakened notch diameter (ND) in the grooves of .076 inches (see Fig. 8).
• Each assembly pin 60 has ten (10) grooves 61a-j prior to shearing to create the tumbler-driver pin sets.
• the pin notch diameter ND of each of the grooves is selected to provide sufficient strength so that the assembly pins 60 will not fail when a key (or tool of cross section to permit penetration into the keyhole) is torqued.
• the key (or tool) will fail through breaking, shearing or twisting before the pins 60 shear.
• a hardened steel key was inserted into the keyhole of a lock of the present invention and a torque of 240 lb/in was applied to the key. The tool broke without shearing the pins 60.
• the pin grooves 61a-j are also shaped to create fracture or shear surfaces on both tumbler and driver pins which are non-flat and which facilitate lock operation.
• grooves 61a-j are shaped so that upon fracturing during manufacture or customizing by a locksmith, tumbler and driver pins 60 having end configurations including chamfer surfaces 63 are formed which assist in plug rotation during subsequent operation.
• padlock 103 includes lock body 104 having shell-plug assembly 104a comprised of plug 105 and shell 106. Also shown is shackle 107, key 108 and serrated assembly pins 110.
• Plug 105 includes collar 105c, plug circumferential undercut 109, plug surface 105s, and plug tail 111. Undercut 109, having bottom 109b and sides 109s, circumscribes plug 105 (see Fig. 13a) .
• Shell 106 includes upper housing portion 113 and lower housing portion 114. Upper housing portion 113 includes five shell pin passageways 116. Plug pin passageways 117 in the lower housing portion are aligned with shell passageways 116. The serrated pins 110 are disposed in these passageways.
• Key 108 includes four (4) notches 108a, which are aligned with the bottoms of the pins 110 when the key is inserted into the keyway of the plug 105.
• plug 105 has been translated in direction Y by a force necessary to shear pins 110 at selected serrations 115 along shear line (SL) .
• upper driver pins 119a-e and lower tumbler pins 121a-e are formed.
• the four lower tumbler pins 121a-d nearest the keyhole entrance are each moved a distance X to align with the four upper driver pins 119b-e.
• Upper driver pin 119a drops down into plug undercut 109 where it is held against undercut bottom 109b by spring 112a.
• plug 105 With upper driver pin 119a so positioned, plug 105 can turn but cannot be withdrawn from shell 106 because sides 109s engage upper driver pin 119a. This anti-withdrawal feature adds to the security of padlock 103.
• Lower tumbler pin 121e becomes inactive in its plug passageway 117, which serves as pin section entrapment hole.
• passageways 116 and 117 have diameter dimensions of d.
• Pins 110 are substantially the same but slightly less in diameter than the passageways.
• the spacing between the passageways is small enough so that an adjacent pin, such as tumbler pin 121a supports an upper driver pin such as driver pin 119b before tumbler pin 121b has moved out from under driver pin 119b (see Fig. 14) .
• the anti-withdrawal feature of the present invention is also useful in conventional pin tumbler locks where tumbler and driver pins are first formed and then assembled.
• an additional shell passageway and aligned plug passageway are formed into which is placed a shearable pin.
• the plug includes an undercut. When the plug and a shell are assembled, the pin is sheared and a portion enters the plug undercut to prevent plug withdrawal while permitting plug rotation in the shell.

Landscapes

• Lock And Its Accessories (AREA)
• Shearing Machines (AREA)
• Conveying And Assembling Of Building Elements In Situ (AREA)
• Automatic Assembly (AREA)
• Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=23536202

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (3)

Citations (5)

Family Cites Families (1)

• 1996
  • 1996-02-06 EP EP96906284A patent/EP0809742A4/en not_active Withdrawn
  • 1996-02-06 CN CNB961932937A patent/CN1170999C/zh not_active Expired - Fee Related
  • 1996-02-06 WO PCT/US1996/001519 patent/WO1996025574A1/en not_active Application Discontinuation
  • 1996-02-06 BR BR9607338A patent/BR9607338A/pt not_active Application Discontinuation
  • 1996-02-06 CA CA002213126A patent/CA2213126C/en not_active Expired - Fee Related
  • 1996-02-06 AU AU49716/96A patent/AU693327B2/en not_active Ceased
  • 1996-02-15 TW TW085101911A patent/TW368542B/zh not_active IP Right Cessation

Patent Citations (5)

Non-Patent Citations (1)

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