WO1990001096A1 - Detent pin cylinder lock - Google Patents

Detent pin cylinder lock Download PDF

Info

Publication number
WO1990001096A1
WO1990001096A1 PCT/FI1989/000139 FI8900139W WO9001096A1 WO 1990001096 A1 WO1990001096 A1 WO 1990001096A1 FI 8900139 W FI8900139 W FI 8900139W WO 9001096 A1 WO9001096 A1 WO 9001096A1
Authority
WO
WIPO (PCT)
Prior art keywords
detent pin
detent
pin
cylinder
lock
Prior art date
Application number
PCT/FI1989/000139
Other languages
French (fr)
Inventor
Lauri Janhunen
Original Assignee
Turvakonsultit Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from FI883519A external-priority patent/FI883519A/en
Application filed by Turvakonsultit Oy filed Critical Turvakonsultit Oy
Publication of WO1990001096A1 publication Critical patent/WO1990001096A1/en

Links

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
    • E05B27/0003—Details
    • E05B27/0007—Rotors
    • E05B27/001—Rotors having relatively movable parts, e.g. coaxial- or split-plugs

Definitions

  • a typical detent pin cylinder lock known in the art comprises a stationary outer cylinder; an inner cylinder disposed inside the outer cylinder; a plural ⁇ ity of detent pins of mutually different and/or equal lengths, and said inner cylinder comprising a key aper- ture for engaging the key in cooperation with the detent pins with the detent pins, in their locking positions, inhibiting the turning of the inner cylinder relative to the outer cylinder; and a number of press pins e- quivalent to that of the detent pins, said press pins being with spring loading arranged to keep the detent pins in their locking positions.
  • the reference SE-408444 discloses a lock in which the press pin and detent pin, when in interaction with each other, are stiffened in relation to each other so that when the detent pin rotates about its longitudinal direction the press pin will also rotate. Owing to the force of the spring which loads the press pin and to the friction between spring and press pin, rotation of the whole assembly is stiff, and this impedes the operation of opening the lock with the key because the rotation of the detent pin to its opening position is uncertain. This uncertain rotation also impairs the positive lock ⁇ ing feature. It is a further problem with locks of prior art, that they are inconvenient and complicated as to their construction.
  • the object of the invention is to eliminate the drawbacks mentioned. It is a particular object of the invention to provide a lock presenting sensitive and reliable action, and which is light to operate.
  • One further object of the invention is to pro ⁇ vide a lock which is difficult to pick with a skeleton key.
  • the detent pin cylinder lock of the invention is characterized by that which is stated in Claim 1.
  • the detent pin comprises a transversal opening notch which runs paral ⁇ lel to the transversal tangent of the inner cylinder when the detent pin is in its opening position;
  • the outer cylinder comprises a mating member for receiving the opening notch of the detent pin, and on the outer surface of the inner cylinder has been disposed a sup ⁇ porting member for supporting the press pin when the inner cylinder is rotated relative to the outer cylin ⁇ der.
  • the lock compri ⁇ ses sham members which have been arranged to give a misleading impression of the lock's detent pin being in the opening position, for misleading a person trying to pick the lock.
  • the mating member provided on the outer cylinder has been formed as part of a separate shell lying between the outer and inner cylinders and attached to the outer cylinder.
  • the mating member might be formed directly to be a member integral with the outer cylinder, but it is advantageous in view of manufacturing techniques to form said mating member on a separate body, which is a shell-like, cylindrical tubular enclosure.
  • Attachment of the shell to the outer cylinder is here understood to mean that the shell cannot rotate relative to the outer cylinder when the key is turned and is instead anchored in place by an appropriate mode of attachment, e.g. by the aid of a tight fit between the inner sur ⁇ face of the outer cylinder and the outer surface of the shell.
  • a longitudinal aperture for receiving the support ⁇ ing members.
  • the sector angle of this aperture is ad ⁇ vantageously larger than the sector angle of the sup ⁇ porting member so that it is easy to insert the inner cylinder, provided with supporting members, in the shell in such manner that the supporting member enters the longitudinal aperture of the shell.
  • the surfaces facing each other of the detent pin and the press pin are convex. This has particular significance in view of sensitive and positive operation of the lock, implying that the lock will be light to operate and no binding of parts will be encountered.
  • the sup- porting member is an annular rail or flange projecting radially from the outer periphery of the inner cylin ⁇ der.
  • the supporting member extends radially to such height from the surface of the inner cylinder that, when the supporting member receives the press pin to support it, from upon the detent pin, and when the inner cylinder is rotated relative to the outer cylinder, the press pin will not descend any substantial distance toward the inner cylinder and will rather be held sub ⁇ stantially unmoved in unchanged position.
  • the mating member consists of a slot opening onto the inner surface of the shell and defining an annular space, and the supporting member and slot have been fitted to go one inside the other when the inner cylinder is rotated relative to the outer cylinder.
  • the supporting member and slot have been fitted to go one inside the other when the inner cylinder is rotated relative to the outer cylinder.
  • the detent pin comprises two opening notches which have been formed on the upper end of the detent pin, transversally and parallelling each other on both sides of the pin, and the slot has flanges which are disposed to cooperate with the opening notches on the detent pin, whereby the slot will receive the detent pin to travel in the slot only when the detent pin is at a given height and in a given position, rotated about its longitudinal axis, relative to the slot.
  • the cross sec ⁇ tion of the slot and of the supporting member is shaped like the letter T.
  • the sham members comprise two sham notches formed on the detent pin, these notches being formed on the upper end of the detent pin. transversally and parallel to each other on both sides, in the transversal direction under an angle different from that of the opening notches and on the same or different heights in the longitudinal direction of the detent pin, compared with the opening notches; and a sham fit formed on the initial end of the slot, such as a widening or a bevel or the like, whereby when the sham notches of the detent pin are on a given height and in a given position relative to the slot the sham fit will receive the detent pin to proceed in the slot through a distance which is less than the opening turn- ing angle required to open the lock.
  • a person who tries to pick the lock by searching for the correct positions of the opening notches on the detent pins one by one will find this work extremely frustrating owing to said sham notches because they give a misleading impression of the detent pins being in the
  • the circumferen ⁇ tial length of the supporting members is greater than the opening turning angle of the lock. In an embodiment of the lock, the circumferen ⁇ tial length of the supporting members is 90° to 140°, suitably 100° to 130° and advantageously about 120°.
  • the invention presents the advantage that the lock of the invention is particularly reliable and sen- sitive of action, and light to operate.
  • the lock presents a simple construction and is easy to assemble.
  • the invention presents the advan- tage that those uncertainty factors in its function have been eliminated which make the lock easier to pick.
  • FIG. 1 presents schematically and in axonomet- ric exploded view, and partly sectioned, an embodiment of the detent pin cylinder lock of the invention
  • Fig. 2 presents schematically and partly sec ⁇ tioned, the detent pin cylinder lock of Fig. l in assem- bled condition;
  • Fig. 3 presents, in cross section, another embodiment of the detent pin cylinder lock of the in ⁇ vention, in locked position
  • Fig. 4 presents the lock of Fig. 3 with the key to the lock inserted in the key aperture;
  • Fig. 5 presents the lock of Fig. 3, the lock having been turned into the opening position;
  • Fig. 6 shows the partial section VI-VI of the lock of Fig. 5;
  • Fig. 7 presents axonometrically an embodiment of the detent pin of the lock of the invention
  • Figs 8a, 8b and 8c present a second, third and fourth embodiment of the detent pin of the lock of the invention, viewed from below;
  • Fig. 9 presents axonometrically a fifth embod ⁇ iment of the detent pin of the lock of the invention.
  • a detent pin cyl ⁇ inder lock comprising a stationary outer cylinder 1 and an inner cylinder 2 which has been disposed to be ro- tatable inside the outer cylinder.
  • the lock further comprises a plurality of detent pins 3 , 3-, 3 3 , ... of mutually identical and/or different lengths.
  • the lock further comprises press pins 5 1 , 5 2 , 5- , . . .
  • the detent pin 3 , 3 2 , 3 3 , ... their number corresponding to that of the detent pins 3 X , 3 2 , 3 3 , ..., which have been arranged under spring loading to keep the detent pins in their locking positions, the opening of the lock being determined, when the lock is being opened, both by the act of bringing the detent pins of different lengths to appro ⁇ priate height and by rotating the detent pins about their longitudinal direction into appropriate positions by the aid of grooves formed in the key to correspond to each detent pin, and of their angles, to enable the inner cylinder to be turned relative to the outer cyl ⁇ inder, and further to open the lock.
  • the outer cylinder 1 further comprises a mating member 7 to receive the opening notch 6 on the detent pin 3 X , 3 2 , 3 3 , ... Fur ⁇ thermore on the outer surface of the inner cylinder 2 has .been disposed a supporting member 8 for supporting the press pin 5 1 , 5 2 , 5 3 , ... when the inner cylinder 2 is being turned relative to the outer cylinder 1.
  • the lock comprises sham members 9 which have been disposed to give a misleading impression suggesting that the detent pin 3 X , 3 2 , 3 3 , ... of the lock is in its opening position, in order to deceive the person who tries to pick the lock.
  • the mating member 7 belonging to the outer cylinder 1 has been formed on a separate shell 10, which is located between the outer cylinder and the inner cylinder 2, attached to the outer cylinder. Attachment of the shell 10 to the outer cylinder 1 is here under ⁇ stood to mean that the shell cannot rotate relative to the outer cylinder when the key is turned, instead of which it is by some suitable mode of fixing anchored to be stationary, e.g. by means of tight fit between the inner surface of the outer cylinder 1 and the outer surface of the shell 10.
  • the opposing faces of the detent pin 3 X , 3 2 , 3 3 , ... and of the press pin 5 X , 5 2 , 5 3 , ... are convex.
  • the contact between the detent pin and the press pin is therefore punctifor .
  • This punctiform contact has the effect that the detent pin can readily rotate about its longitudinal axis because the friction force counterac ⁇ ting such rotation will be minimal.
  • the supporting member 8 is an annular rail or flange projecting radially from the outer periphery of the inner cylinder 2.
  • the outer surface of the support ⁇ ing member 8 is advantageously part of a cylindrical surface or an outward convex smooth surface, whereby when the lock is being turned the convex surface of the press pin 5 X , 5 2 , 5 3 , ... slides with ease on the sur ⁇ face of the supporting member 8.
  • the mating member 7 consists of a slot 11 opening onto the inner surface of the shell 10 and de ⁇ fining an annular space.
  • the supporting member 8 and the slot 11 are disposed to fit one inside the other with free play when the inner cylinder 2 is being ro- tated relative to the outer cylinder 2.
  • the detent pin 3 X , 3 2 , 3 3 , ... comprises two opening notches 6, which have been formed on the upper end of the detent pin transversally and parallel with each other, on both sides of the pin.
  • the slot 11 has flanges 12 which are disposed to cooperate with the opening notches 6 of the whereby the slot will receive the detent pin to travel in the slot only when the de ⁇ tent pin is positioned on a certain height and in a certain rotated position with reference to its longi- tudinal axis.
  • the cross section of the slot 11 and of the supporting member 8 has the shape of a letter T.
  • the longitudinal section of the detent pin 3 X , 3 2 , 3 3 , ... at right angles against the opening notches 6 has the shape of a letter T.
  • the circumferential length of the supporting member 8 is greater than the opening turning angle of the lock, or advantageously about 120°. The supporting member 8 will then support the press pin 5 , 5 2 , 5 3 , ... when the lock has been turned into its opening position.
  • FIGs 3, 4 and 5 the cross section of an embodiment of the lock of the invention illustrates the operation of the lock.
  • the lock presented in Fig. 3 is similar in principle to that depicted in Figs 1 and 2.
  • the lock In the fig ⁇ ure the lock is shown in closed position, the detent pin 3 X together with the press pin 5 X locking the lock in that it prevents the turning of the inner cylinder 2 relative to the outer cylinder 1.
  • the spring-loaded press pin 5 X urges the 3 X against the mating surface in the key channel.
  • the detent pin 3 is positioned in an arbitrary, rotated position relative to its central axis.
  • the shell 10 Between the inner cylinder 2 and the outer cylin ⁇ der 1 is interposed the shell 10, which is interlocked to be immovable relative to the outer cylinder.
  • Fig. 4 the proper key of the lock has been inserted in the lock.
  • the mating groove on the key has lifted the detent pin 3 X to opening height and rotated the detent pin about its longitudinal axis so that the opening notches 6 have become positioned parallel with the transversal tangent of the inner cylinder 2, where ⁇ by the detent pin has assumed its opening position.
  • the press pin 5 X has receded into its own bore and does not obstruct the turning of the key and opening of the lock.
  • Fig. 5 the key has been turned in order to open the lock, whereby, as the opening notches 6 of the detent pin 3 X were in correct position, the slot 11 suitably formed in the shell 10 has received the top end of the detent pin 3 X and the supporting member 9 into itself.
  • the supporting member supports the press pin 5 X .
  • Fig. 7 is presented a detent pin 3 of a lock according to the invention where opening notches 6 have been provided on the upper end of its cylindrical outer surface.
  • a rounded, chisel-shaped tip 15 which is intended, toge- ther with the angle established in the groove of the key, to rotate the detent pin in such manner that the opening notches 6 become suitably positioned relative to the slot 11 in the shell, whereby the flanges 12 formed on the margins of the slot 11 will fit into the opening notches 6.
  • two sham notches 13 have been provided on the upper end of the detent pin, transversally and parallelling each other on both sides of the pin, in transversal direction at an angle dif- ferent from that of the opening notches, and at a height in the longitudinal direction of the pin differ ⁇ ent from that of the opening notches.
  • a sham fit 14 has been provided, such as a bevel or similar, whereby when the sham notch of the detent pin is at a certain height and in a cer ⁇ tain position relative to the sham fit, the sham fit will accept the detent pin to proceed in the slot a cer ⁇ tain distance, which is less than the opening turning angle required to open the lock.
  • Figs 8a, 8b and 8c are shown various detent pins, viewed from below, where the angular orientation of the tip 15 is different relative to the opening notches 6. These, and the different lengths of the dif ⁇ ferent detent pins of the lock, determine the opening combination of the lock.
  • Fig. 9 is presented an embodiment of the detent pin where the opening notches 6 and the sham notches 13 have been formed on the detent pin 3 on equal heights.
  • the opening notches 6 and the sham notches 13 will then render the cross section of the detent pin that has been taken at their height, rectangular so that the short sides of the rectangle are constituted by the sham notches 13 and the long sides are constitut ⁇ ed by the opening notches 6.
  • the sham fit 14 consists of a widening of the initial end of the slot 11, made by making the flanges 12 narrower.

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  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Abstract

A detent pin cylinder lock comprising a stationary outer cylinder (1); an inner cylinder (2) disposed inside the outer cylinder; a plurality of detent pins (3?1, 32, 33¿, ...) of mutually identical and/or different lengths, and said inner cylinder comprising a key aperture (4) for making a key cooperate with the detent pins, the detent pins in their locking positions preventing rotation of the inner cylinder relative to the outer cylinder; and press pins (5?1, 52, 53¿, ...) in a number equivalent to that of the detent pins, said press pins being under spring loading arranged to keep the detent pins in their locking positions, whereby when the lock is being opened, opening of the lock is determined both by the act of bringing the detent pins of different lengths on a suitable height and on rotation of the detent pins about their longitudinal direction into suitable positions with the aid of grooves corresponding to each detent pin that have been formed on the key, and of their angles, in order to enable the inner cylinder to be rotated relative to the outer cylinder and, further, to open the lock. The detent pin (3?1, 32, 33¿, ...) comprises a transversal opening notch (6) which runs parallel to the transversal tangent of the inner cylinder (2) when the detent pin is in its opening position; the outer cylinder comprises a mating member (7) for receiving the opening notch of the detent pin, and on the outer surface of the inner cylinder has been disposed a supporting member (8) for supporting the press pin (5?1, 52, 53¿, ...) while the inner cylinder is being turned relative to the outer cylinder.

Description

DETENT PIN CYLINDER LOCK
The present invention concerns a detent pin cylinder lock as defined in the preamble to Claim 1. A typical detent pin cylinder lock known in the art comprises a stationary outer cylinder; an inner cylinder disposed inside the outer cylinder; a plural¬ ity of detent pins of mutually different and/or equal lengths, and said inner cylinder comprising a key aper- ture for engaging the key in cooperation with the detent pins with the detent pins, in their locking positions, inhibiting the turning of the inner cylinder relative to the outer cylinder; and a number of press pins e- quivalent to that of the detent pins, said press pins being with spring loading arranged to keep the detent pins in their locking positions. When a lock of this type is being unlocked, its opening is determined both by the act of bringing the detent pins of different lengths to suitable heights and by turning the detent pins about their longitudinal direction into suitable positions with the aid of grooves corresponding each detent pin that have been formed in the key and of their angles, for enabling rotation of the inner cylinder relative to the outer cylinder and, further opening of the lock. Such locks have for instance been disclosed in the Swedish reference SE—408444.
The problem with these devices of prior art is that they are not particularly reliable and sensitive as to their functioning. The reference SE-408444, for instance, discloses a lock in which the press pin and detent pin, when in interaction with each other, are stiffened in relation to each other so that when the detent pin rotates about its longitudinal direction the press pin will also rotate. Owing to the force of the spring which loads the press pin and to the friction between spring and press pin, rotation of the whole assembly is stiff, and this impedes the operation of opening the lock with the key because the rotation of the detent pin to its opening position is uncertain. This uncertain rotation also impairs the positive lock¬ ing feature. It is a further problem with locks of prior art, that they are inconvenient and complicated as to their construction.
The object of the invention is to eliminate the drawbacks mentioned. It is a particular object of the invention to provide a lock presenting sensitive and reliable action, and which is light to operate.
It is a further object of the invention to provide a lock in which the uncertainty factors tending to facilitate the picking of the lock have been elimi¬ nated.
One further object of the invention is to pro¬ vide a lock which is difficult to pick with a skeleton key. The detent pin cylinder lock of the invention is characterized by that which is stated in Claim 1.
As taught by the invention, the detent pin comprises a transversal opening notch which runs paral¬ lel to the transversal tangent of the inner cylinder when the detent pin is in its opening position; the outer cylinder comprises a mating member for receiving the opening notch of the detent pin, and on the outer surface of the inner cylinder has been disposed a sup¬ porting member for supporting the press pin when the inner cylinder is rotated relative to the outer cylin¬ der.
In an embodiment of the lock, the lock compri¬ ses sham members which have been arranged to give a misleading impression of the lock's detent pin being in the opening position, for misleading a person trying to pick the lock.
In an embodiment of the invention, the mating member provided on the outer cylinder has been formed as part of a separate shell lying between the outer and inner cylinders and attached to the outer cylinder. Of course, the mating member might be formed directly to be a member integral with the outer cylinder, but it is advantageous in view of manufacturing techniques to form said mating member on a separate body, which is a shell-like, cylindrical tubular enclosure. Attachment of the shell to the outer cylinder is here understood to mean that the shell cannot rotate relative to the outer cylinder when the key is turned and is instead anchored in place by an appropriate mode of attachment, e.g. by the aid of a tight fit between the inner sur¬ face of the outer cylinder and the outer surface of the shell. In the wall of the shell has advantageously been made a longitudinal aperture for receiving the support¬ ing members. The sector angle of this aperture is ad¬ vantageously larger than the sector angle of the sup¬ porting member so that it is easy to insert the inner cylinder, provided with supporting members, in the shell in such manner that the supporting member enters the longitudinal aperture of the shell.
In an embodiment of the lock, the surfaces facing each other of the detent pin and the press pin are convex. This has particular significance in view of sensitive and positive operation of the lock, implying that the lock will be light to operate and no binding of parts will be encountered.
In an embodiment of the invention, the sup- porting member is an annular rail or flange projecting radially from the outer periphery of the inner cylin¬ der. The supporting member extends radially to such height from the surface of the inner cylinder that, when the supporting member receives the press pin to support it, from upon the detent pin, and when the inner cylinder is rotated relative to the outer cylinder, the press pin will not descend any substantial distance toward the inner cylinder and will rather be held sub¬ stantially unmoved in unchanged position.
In an embodiment of the invention, the mating member consists of a slot opening onto the inner surface of the shell and defining an annular space, and the supporting member and slot have been fitted to go one inside the other when the inner cylinder is rotated relative to the outer cylinder. Of course, there is then a given amount of play between the supporting mem- ber and the slot.
In an embodiment of the invention, the detent pin comprises two opening notches which have been formed on the upper end of the detent pin, transversally and parallelling each other on both sides of the pin, and the slot has flanges which are disposed to cooperate with the opening notches on the detent pin, whereby the slot will receive the detent pin to travel in the slot only when the detent pin is at a given height and in a given position, rotated about its longitudinal axis, relative to the slot.
In an embodiment of the lock, the cross sec¬ tion of the slot and of the supporting member is shaped like the letter T.
In an embodiment of the lock, the sham members comprise two sham notches formed on the detent pin, these notches being formed on the upper end of the detent pin. transversally and parallel to each other on both sides, in the transversal direction under an angle different from that of the opening notches and on the same or different heights in the longitudinal direction of the detent pin, compared with the opening notches; and a sham fit formed on the initial end of the slot, such as a widening or a bevel or the like, whereby when the sham notches of the detent pin are on a given height and in a given position relative to the slot the sham fit will receive the detent pin to proceed in the slot through a distance which is less than the opening turn- ing angle required to open the lock. A person who tries to pick the lock by searching for the correct positions of the opening notches on the detent pins one by one will find this work extremely frustrating owing to said sham notches because they give a misleading impression of the detent pins being in the opening position.
In an embodiment of the lock, the circumferen¬ tial length of the supporting members is greater than the opening turning angle of the lock. In an embodiment of the lock, the circumferen¬ tial length of the supporting members is 90° to 140°, suitably 100° to 130° and advantageously about 120°.
The invention presents the advantage that the lock of the invention is particularly reliable and sen- sitive of action, and light to operate.
It is a further advantage of the invention that the lock presents a simple construction and is easy to assemble.
In addition the invention presents the advan- tage that those uncertainty factors in its function have been eliminated which make the lock easier to pick.
In the following the invention is described in detail, referring to the drawing hereto attached, wherein:- Fig. 1 presents schematically and in axonomet- ric exploded view, and partly sectioned, an embodiment of the detent pin cylinder lock of the invention;
Fig. 2 presents schematically and partly sec¬ tioned, the detent pin cylinder lock of Fig. l in assem- bled condition;
Fig. 3 presents, in cross section, another embodiment of the detent pin cylinder lock of the in¬ vention, in locked position;
Fig. 4 presents the lock of Fig. 3 with the key to the lock inserted in the key aperture;
Fig. 5 presents the lock of Fig. 3, the lock having been turned into the opening position; Fig. 6 shows the partial section VI-VI of the lock of Fig. 5;
Fig. 7 presents axonometrically an embodiment of the detent pin of the lock of the invention; Figs 8a, 8b and 8c present a second, third and fourth embodiment of the detent pin of the lock of the invention, viewed from below; and
Fig. 9 presents axonometrically a fifth embod¬ iment of the detent pin of the lock of the invention. In Figs 1 and 2 is depicted a detent pin cyl¬ inder lock comprising a stationary outer cylinder 1 and an inner cylinder 2 which has been disposed to be ro- tatable inside the outer cylinder. The lock further comprises a plurality of detent pins 3 , 3-, 33, ... of mutually identical and/or different lengths. The inner cylinder comprises a key aperture 4 for causing the key to cooperate with the detent pins 3X, 3=, 33, ..., the detent pins in their locking positions preventing rota¬ tion of the inner cylinder relative to the outer cylin- der. The lock further comprises press pins 51, 52, 5- , . . . r their number corresponding to that of the detent pins 3X, 32, 33, ..., which have been arranged under spring loading to keep the detent pins in their locking positions, the opening of the lock being determined, when the lock is being opened, both by the act of bringing the detent pins of different lengths to appro¬ priate height and by rotating the detent pins about their longitudinal direction into appropriate positions by the aid of grooves formed in the key to correspond to each detent pin, and of their angles, to enable the inner cylinder to be turned relative to the outer cyl¬ inder, and further to open the lock. As taught by the invention, the detent pin 3 , 32, 33, ... comprises a transversal opening notch 6, which parallels the transversal tangent to the inner cylinder when the de¬ tent pin is in the opening position. The outer cylinder 1 further comprises a mating member 7 to receive the opening notch 6 on the detent pin 3X, 32, 33, ... Fur¬ thermore on the outer surface of the inner cylinder 2 has .been disposed a supporting member 8 for supporting the press pin 51, 52, 53, ... when the inner cylinder 2 is being turned relative to the outer cylinder 1.
The lock comprises sham members 9 which have been disposed to give a misleading impression suggesting that the detent pin 3X, 32, 33, ... of the lock is in its opening position, in order to deceive the person who tries to pick the lock.
The mating member 7 belonging to the outer cylinder 1 has been formed on a separate shell 10, which is located between the outer cylinder and the inner cylinder 2, attached to the outer cylinder. Attachment of the shell 10 to the outer cylinder 1 is here under¬ stood to mean that the shell cannot rotate relative to the outer cylinder when the key is turned, instead of which it is by some suitable mode of fixing anchored to be stationary, e.g. by means of tight fit between the inner surface of the outer cylinder 1 and the outer surface of the shell 10.
The opposing faces of the detent pin 3X, 32, 33, ... and of the press pin 5X, 52, 53, ... are convex. The contact between the detent pin and the press pin is therefore punctifor . This punctiform contact has the effect that the detent pin can readily rotate about its longitudinal axis because the friction force counterac¬ ting such rotation will be minimal.
The supporting member 8 is an annular rail or flange projecting radially from the outer periphery of the inner cylinder 2. The outer surface of the support¬ ing member 8 is advantageously part of a cylindrical surface or an outward convex smooth surface, whereby when the lock is being turned the convex surface of the press pin 5X, 52, 53, ... slides with ease on the sur¬ face of the supporting member 8.
The mating member 7 consists of a slot 11 opening onto the inner surface of the shell 10 and de¬ fining an annular space. The supporting member 8 and the slot 11 are disposed to fit one inside the other with free play when the inner cylinder 2 is being ro- tated relative to the outer cylinder 2.
The detent pin 3X, 32, 33, ... comprises two opening notches 6, which have been formed on the upper end of the detent pin transversally and parallel with each other, on both sides of the pin. The slot 11 has flanges 12 which are disposed to cooperate with the opening notches 6 of the whereby the slot will receive the detent pin to travel in the slot only when the de¬ tent pin is positioned on a certain height and in a certain rotated position with reference to its longi- tudinal axis.
The cross section of the slot 11 and of the supporting member 8 has the shape of a letter T. The longitudinal section of the detent pin 3X, 32, 33, ... at right angles against the opening notches 6 has the shape of a letter T.
The circumferential length of the supporting member 8 is greater than the opening turning angle of the lock, or advantageously about 120°. The supporting member 8 will then support the press pin 5 , 52, 53, ... when the lock has been turned into its opening position.
In Figs 3, 4 and 5, the cross section of an embodiment of the lock of the invention illustrates the operation of the lock. The lock presented in Fig. 3 is similar in principle to that depicted in Figs 1 and 2. In the fig¬ ure the lock is shown in closed position, the detent pin 3X together with the press pin 5X locking the lock in that it prevents the turning of the inner cylinder 2 relative to the outer cylinder 1. The spring-loaded press pin 5X urges the 3X against the mating surface in the key channel. The detent pin 3 is positioned in an arbitrary, rotated position relative to its central axis. Between the inner cylinder 2 and the outer cylin¬ der 1 is interposed the shell 10, which is interlocked to be immovable relative to the outer cylinder. The supporting member 8 affixed on the outer surface of the inner cylinder 2, of which the length on the periphery of the inner cylinder is equivalent to a fraction of about 120° of an imaginary circular arc, is located in an aperture provided in the shell 9 and being larger in size than said 120°.
In Fig. 4 the proper key of the lock has been inserted in the lock. The mating groove on the key has lifted the detent pin 3X to opening height and rotated the detent pin about its longitudinal axis so that the opening notches 6 have become positioned parallel with the transversal tangent of the inner cylinder 2, where¬ by the detent pin has assumed its opening position. The press pin 5X has receded into its own bore and does not obstruct the turning of the key and opening of the lock.
In Fig. 5 the key has been turned in order to open the lock, whereby, as the opening notches 6 of the detent pin 3X were in correct position, the slot 11 suitably formed in the shell 10 has received the top end of the detent pin 3X and the supporting member 9 into itself. The supporting member supports the press pin 5X. When the lock is now turned back to the locking position, the supporting member 8 without difficulty releases the press pin 5X to be borne by the detent pin 3X, and the key can be withdrawn, thus restoring the situation of Fig. 3.
It is seen in the partial section VI-VI of Fig. 5, presented in Fig. 6, that the cross section of the slot 11 and of the supporting member 8 has the shape of a letter T, and that the supporting member fits into the slot 11 with free play.
In Fig. 7 is presented a detent pin 3 of a lock according to the invention where opening notches 6 have been provided on the upper end of its cylindrical outer surface. On the other end of the pin has been formed a rounded, chisel-shaped tip 15, which is intended, toge- ther with the angle established in the groove of the key, to rotate the detent pin in such manner that the opening notches 6 become suitably positioned relative to the slot 11 in the shell, whereby the flanges 12 formed on the margins of the slot 11 will fit into the opening notches 6.
On the detent pin 3 two sham notches 13 have been provided on the upper end of the detent pin, transversally and parallelling each other on both sides of the pin, in transversal direction at an angle dif- ferent from that of the opening notches, and at a height in the longitudinal direction of the pin differ¬ ent from that of the opening notches. On the initial end of the slot 11 a sham fit 14 has been provided, such as a bevel or similar, whereby when the sham notch of the detent pin is at a certain height and in a cer¬ tain position relative to the sham fit, the sham fit will accept the detent pin to proceed in the slot a cer¬ tain distance, which is less than the opening turning angle required to open the lock. In Figs 8a, 8b and 8c are shown various detent pins, viewed from below, where the angular orientation of the tip 15 is different relative to the opening notches 6. These, and the different lengths of the dif¬ ferent detent pins of the lock, determine the opening combination of the lock.
In Fig. 9 is presented an embodiment of the detent pin where the opening notches 6 and the sham notches 13 have been formed on the detent pin 3 on equal heights. The opening notches 6 and the sham notches 13 will then render the cross section of the detent pin that has been taken at their height, rectangular so that the short sides of the rectangle are constituted by the sham notches 13 and the long sides are constitut¬ ed by the opening notches 6. The sham fit 14 consists of a widening of the initial end of the slot 11, made by making the flanges 12 narrower.When the detent pin is in a suitable position, owing to the sham fit 14 and the sham notches 13, the detent pin cannot proceed far¬ ther in the slot 11 than its very beginning, yet at the same time it gives the person trying to pick the lock a misleading feeling as if the detent pin were in its opening position.
The invention is not confined to concern mere¬ ly the embodiment examples presented in the foregoing: numerous modifications are feasible as long as one keeps within the scope of the inventive idea defined by the claims.

Claims

1. A detent pin cylinder lock comprising a stationary outer cylinder (1) ; an inner cylinder (2) disposed within the outer cylinder; a plurality of de- tent pins (3X, 32, 33, ...) of mutually equal and/or different lengths, and said inner cylinder comprising a key aperture (4) for making a key cooperate with the detent pins, the detent pins in their locking positions preventing the turning of the inner cylinder relative to the outer cylinder; and press pins (5X, 52, 53, ...) in a number equivalent to that of the detent pins, said press pins being under spring loading arranged to keep the detent pins in their locking positions, whereby the opening of the lock is determined both by the act of bringing the detent pins of different lengths to a suitable height and by rotating the detent pins about their longitudinal direction into suitable positions by the aid of grooves corresponding to each detent pin and of their angles, in order to enable the inner cylinder to be turned and, further, the lock to be opened, c h a r a c t e r i z e d in that the detent pin (3 , 32, 33, ...) comprises a transversal opening notch (6) parallelling the transversal tangent of the inner cylin¬ der (2) when the detent pin is in its opening position; that the outer cylinder comprises a mating member (7) to receive the opening notch of the detent pin, and that on the outer surface of the inner cylinder has been disposed a supporting member (8) to support the press pin (5X, 52, 53, ...) when the inner cylinder is being rotated relative to the outer cylinder.
2. Detent pin cylinder lock according to claim 1, c h a r a c t e r i z e d in that the lock com¬ prises sham members (9) which have been arranged to give a misleading impression of the lock's detent pin (3X, 32, 33, ...) being in its opening position, in order to deceive a person trying to pick the lock.
3. Detent pin cylinder lock according to claim l or 2, c h a r a c t e r i z e d in that the mating member (7) belonging to the outer cylinder (1) has been formed in- a separate shell (10) located between the outer cylinder and the inner cylinder (2) , attached to the outer cylinder.
4. Detent pin cylinder lock according to any one of claims 1-3, c h a r a c t e r i z e d in that the surfaces facing each other of the detent pin (3X, 32, 33, ...) and of the press pin (5 , 52, 53, ...) are convex.
5. Detent pin cylinder lock according to any one of claims 1-4, c h a r a c t e r i z e d in that the supporting member (8) is an annular rail or flange projecting radially from the outer periphery of the inner cylinder (2) .
6. Detent pin cylinder lock according to any one of claims 2-5, c h a r a c t e r i z e d in that the mating member (7) consists of a slot (11) opening onto the inner surface of the shell (10) and defining an annular space, and that the supporting member (8) and the slot have been disposed to fit one into the other when the inner cylinder (2) is being rotated relative to the outer cylinder (1) .
7. Detent pin cylinder lock according to any one of claims 1-6, c h a r a c t e r i z e d in that the detent pin (3X, 32, 33, ...) comprises two opening notches (6) which have been formed on the upper end of the detent pin transversally and parallel to each other on both sides of the pin, and that the slot (11) has flanges (12) which have been arranged to cooperate with the opening notches of the detent pins, whereby the slot will accept the detent pin to travel in the slot only when the detent pin is located on a certain height and is in a certain position rotated with reference to its longitudinal axis, relative to the slot.
8. Detent pin cylinder lock according to claim 7, c h a r a c t e r i z e d in that the cross section of the slot (11) and of the supporting member (8) has the shape of a letter T.
9. Detent pin cylinder lock according to any one of claims 1-8, c h a r a c t e r i z e d in that the longitudinal section of the detent pin (3 , 32, 33, ...) at right angles* against the opening notches (6) has the shape of a letter T.
10. Detent pin cylinder lock according to any one of claims 2-9, c h a r a c t e r i z e d in that the sham members (9) comprise two sham notches (13) formed in the detent pin (3X, 32, 33, ...) which have been formed on the upper end of the pin transversally and parallel to each other on both sides of the pin, in the transversal direction at an angle different from that of the opening notches (6) and on the same or different heights in the longitudinal direction of the detent pin, compared with the opening notches; and a sham fit (14) provided on the initial end of the slot (14) , such as a widening or a bevel or the like, whereby when the sham notches of the detent pin are positioned at a certain height and in a certain position relative to the sham fit, the sham fit will accept the detent pin to travel in the slot a distance which is less than the opening turning angle requisite to open the lock.
11. Detent pin cylinder lock according to any one of claims 1-10, c h a r a c t e r i z e d in that the circumferential length of the supporting member (8) is greater than the opening turning angle of the lock.
12. Detent pin cylinder lock according to any one of claims 1-11, c h a r a c t e r i z e d in that the circumferential length of the supporting member (8) is 90" to 140°, suitably 100° to 130°, and advantageous¬ ly about 120" .
PCT/FI1989/000139 1988-07-26 1989-07-25 Detent pin cylinder lock WO1990001096A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI883519A FI883519A (en) 1988-07-26 1988-07-26 TAPPSPAERRSYLINDERLAOS OCH NYCKEL.
FI883519 1988-07-26
FI892871 1989-01-26
FI892871A FI892871A (en) 1988-07-26 1989-06-12 CYLINDERLAOS MED STIFTTILLHAOLLARE NYCKEL.

Publications (1)

Publication Number Publication Date
WO1990001096A1 true WO1990001096A1 (en) 1990-02-08

Family

ID=26158398

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1989/000139 WO1990001096A1 (en) 1988-07-26 1989-07-25 Detent pin cylinder lock

Country Status (3)

Country Link
AU (1) AU4040789A (en)
FI (1) FI892871A (en)
WO (1) WO1990001096A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5289709A (en) * 1991-10-24 1994-03-01 Medeco Security Locks, Inc. Pin tumblers and corresponding keys for cylinder locks

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499302A (en) * 1967-03-01 1970-03-10 Roy C Spain Cylinder lock
US3837197A (en) * 1972-04-27 1974-09-24 P Lopez Key-operated locks
US4098103A (en) * 1977-03-07 1978-07-04 Walter Kidde & Company, Inc. Cylinder lock
US4103526A (en) * 1975-03-05 1978-08-01 Emhart Industries, Inc. Pin tumbler lock

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3499302A (en) * 1967-03-01 1970-03-10 Roy C Spain Cylinder lock
US3837197A (en) * 1972-04-27 1974-09-24 P Lopez Key-operated locks
US4103526A (en) * 1975-03-05 1978-08-01 Emhart Industries, Inc. Pin tumbler lock
US4098103A (en) * 1977-03-07 1978-07-04 Walter Kidde & Company, Inc. Cylinder lock

Also Published As

Publication number Publication date
FI892871A (en) 1990-07-27
AU4040789A (en) 1990-02-19
FI892871A0 (en) 1989-06-12

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