EP0064087B1 - Cylinder lock resistant to picking - Google Patents
Cylinder lock resistant to picking Download PDFInfo
- Publication number
- EP0064087B1 EP0064087B1 EP81103287A EP81103287A EP0064087B1 EP 0064087 B1 EP0064087 B1 EP 0064087B1 EP 81103287 A EP81103287 A EP 81103287A EP 81103287 A EP81103287 A EP 81103287A EP 0064087 B1 EP0064087 B1 EP 0064087B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lock
- key
- cylinder
- locking means
- ward
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 235000014676 Phragmites communis Nutrition 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000007246 mechanism Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B35/00—Locks for use with special keys or a plurality of keys ; keys therefor
Definitions
- the present invention concerns a cylinder lock and a key for unlocking this lock, comprising a body with a hook, and locking means to prevent the hook from being pulled out from locked position to unlocked position; a rotatable cylinder with its upper end structured so as to co-operate with the locking means to allow the hook to be pulled out when the cylinder is turned to a certain position; a bush with one of its ends forming a tortuous entrance into which the key can be screwed, said bush being fixedly secured in the body.
- conventional cylinder keys comprise substantially a planar key with an indented edge, a cylinder, and a body internally provided with a plurality of pin tumblers resiliently retained in a tunnel orienting to the keyway.
- the resilient means generally springs, which urge the pin tumblers against the notches of a key at a specific level to discriminate if the key is the correct one, are hair-spring thin. After some use accumulation of rust or dirt may lead to failure of such fine parts, thus reducing the life of the lock.
- a preferred feature of this invention is that the resilient means can be economically a thick metal reeds instead of the springs fabricated by extremely fine wire, thus enhancing the durability and reducing the cost of the manufacture thereof.
- the cylinder lock according to the invention includes a body, a cylinder, a bush and a key, generally designated by reference numerals (10), (20), (30), and (40) respectively.
- the body has a bore (11) which receives cylinder (20) and bush (30), the former being rotatable therein, whereas the latter being immovably secured in place, for example by passing a pin (15) through hole (151).
- Hook (12) has a recess (121), the dimension and the position of which allow one part of ball (13) retained within a hole (14) to enter when the hook is in locked position in blind hole (16) so that it cannot be pull up.
- Like structure may be formed at the other leg of hook (12). (See Figure 2).
- cylinder (20) At one end of cylinder (20) there are provided with two opposite recesses (26), each of which is formed by a cutout defined by two intersecting faces (261) (262).
- face (261) directly opposite to ball (13), i.e. normal to the long axis of hole (14) the clearance between the inner wall of body (10) and the upper end of cylinder is broadest and enough to allow the ball to totally leave recess (121) to free hook (12) so that the latter can be unlocked (see Figure 2).
- the non-recessed portion (27) urges ball (13) back into recess (121) to lock hook (12).
- the outer end of bush (30) is provided with a spiral entrance (31) which is structured so that only an object with spiral structure of which the pitch and lead angle substantially coincides with that of the entrance is allowed to be screwed thereinto. Further, to discriminate whether or not the key thus enters is the correct one, the lower end (21) of cylinder (20), which is nested in the upper end of bush (30), forms a plurality of slots (22) spaced apart from each other around the periphery of end (21) and extending along the length of cylinder (20).
- the end of key (40) forms an enlarged end (42) provided with a plurality of projectors (41) arranged around the periphery thereof, the dimension and position of which projections substantially coincide with the slots (22), and at the site the upper end of bush corresponding to each slot (22) there is a hole (32), through which a ward piece (33) is resiliently urged inwardly to reach one of said slots (22).
- the projections are preferably ridged extending along the length of said key.
- ward piece (33) is inseparably fixed to one end of a spring reed (34), the other end of the latter being secured to the outer wall of bush (30) by, for example, welding or by a screw (not shown).
- spiral groove (43) extending across the projections (41), which spiral groove (43) is bitten into by the helical edge (31 1 ) of spiral entrance (31), thereby allowing the key to be screwed into the bush to reach cylinder.
- the enlarged end (42) of the key looks like a gear.
- the width of each projection and the distance between any two adjacent projections may differ greatly at random, depending on the design of the slots (22). As all of the pitch and the lead angle of the spiral entrance, and the position and number of the slots may vary arbitrarily, the probability that a lock happened to be unlocked by the key of another such lock is extremely low, thus ensuring high security and reliability of this invention.
- An alternative modification of the key (40), designated by (40'), is also feasible. It has a spiral shank (43'), with a length of its front forming a plurality of projections at the outer side.
- the slots (22) of cylinder (20) and the ward pieces (33) and holes (32) of bush (30) must be arranged in a spiral trajectory instead of a circumference. This is easy to understand, and therefore not illustrated in the drawing.
- the spiral shank must be structured so that it, before reaching the slots, can be pushed inwardly a short distance in axial direction to fit its projection into mating slots.
Landscapes
- Lock And Its Accessories (AREA)
- Gates (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
- Centrifugal Separators (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
Description
- The present invention concerns a cylinder lock and a key for unlocking this lock, comprising a body with a hook, and locking means to prevent the hook from being pulled out from locked position to unlocked position; a rotatable cylinder with its upper end structured so as to co-operate with the locking means to allow the hook to be pulled out when the cylinder is turned to a certain position; a bush with one of its ends forming a tortuous entrance into which the key can be screwed, said bush being fixedly secured in the body.
- Basically conventional cylinder keys comprise substantially a planar key with an indented edge, a cylinder, and a body internally provided with a plurality of pin tumblers resiliently retained in a tunnel orienting to the keyway. When a key with a contoured profile on one edge is inserted into the keyway from the keyhole, the pins will be contacted by these undulation, and once the correct key is inserted thereinto, then the pin tumblers will all be arranged in such a position as to allow the cylinder to be turned. Straight in structure, the keyway of such conventional lock are liable to be picked by probing a wire therein. Moreover, the resilient means, generally springs, which urge the pin tumblers against the notches of a key at a specific level to discriminate if the key is the correct one, are hair-spring thin. After some use accumulation of rust or dirt may lead to failure of such fine parts, thus reducing the life of the lock.
- Still further, traditional locks are complicated in their construction which means that these are difficult to assemble and to manufacture and which also means that the cost of production is high.
- There is known a lock of this kind according to the generic motion of the main claim (US-A-1 849 070) which, however, is not only difficult to manufacture but, in addition, does not offer reliable protection against picking.
- Finally, it is known (US-A-1 526 728) to provide a spiral entrance with locks into which the key can be screwed.
- it is the main object of this invention to provide a cylinder lock which obviates the above defects in that the lock is more secure against unauthorised unlocking without the use of the correct key and also that the use of spring loaded wards is obviated. Thus the life of the lock is increased.
- In a cylinder lock and a key of the type indicated in the prior art portion of claim 1 this object in conformity with the present invention is reached in that:
- the tortuous entrance in the bush has a spiral shape having pitch and lead angle corresponding to the spiral provided on the key;
- the bush is provided with a plurality of ward means receivable in a plurality of female locking means, to prevent the rotation of the cylinder;
- the key is provided with a plurality of male locking means receivable in corresponding said female locking means, when the key is screwed into the spiral entrance of the lock and pushed into the lock, said male locking means acting on the ward means engaged into the female locking means so as to relieve the effect of the ward means and allow the rotation of the cylinder.
- A preferred feature of this invention is that the resilient means can be economically a thick metal reeds instead of the springs fabricated by extremely fine wire, thus enhancing the durability and reducing the cost of the manufacture thereof.
- Other and important objects of this invention will be apparent from the following description, claims and accompanying drawing.
- Figure 1 is an exploded perspective view of a cylinder lock constructed in accordance with the invention;
- Figure 2 is a longitudinal cross-sectional view of the assembled lock of Figure 1 with the key in position;
- Referring now to the drawings, the cylinder lock according to the invention includes a body, a cylinder, a bush and a key, generally designated by reference numerals (10), (20), (30), and (40) respectively.
- In the preferred embodiment of Figure 1, the body has a bore (11) which receives cylinder (20) and bush (30), the former being rotatable therein, whereas the latter being immovably secured in place, for example by passing a pin (15) through hole (151).
- Hook (12) has a recess (121), the dimension and the position of which allow one part of ball (13) retained within a hole (14) to enter when the hook is in locked position in blind hole (16) so that it cannot be pull up. Like structure may be formed at the other leg of hook (12). (See Figure 2).
- At one end of cylinder (20) there are provided with two opposite recesses (26), each of which is formed by a cutout defined by two intersecting faces (261) (262). When the cylinder is turned to a position such that face (261) directly opposite to ball (13), i.e. normal to the long axis of hole (14), the clearance between the inner wall of body (10) and the upper end of cylinder is broadest and enough to allow the ball to totally leave recess (121) to free hook (12) so that the latter can be unlocked (see Figure 2). Similarly, when cylinder (20) is turned in reverse direction, the non-recessed portion (27) urges ball (13) back into recess (121) to lock hook (12).
- To allow only selective entry of specific keys, the outer end of bush (30) is provided with a spiral entrance (31) which is structured so that only an object with spiral structure of which the pitch and lead angle substantially coincides with that of the entrance is allowed to be screwed thereinto. Further, to discriminate whether or not the key thus enters is the correct one, the lower end (21) of cylinder (20), which is nested in the upper end of bush (30), forms a plurality of slots (22) spaced apart from each other around the periphery of end (21) and extending along the length of cylinder (20). Complementary to these slots, the end of key (40), in a preferred embodiment, forms an enlarged end (42) provided with a plurality of projectors (41) arranged around the periphery thereof, the dimension and position of which projections substantially coincide with the slots (22), and at the site the upper end of bush corresponding to each slot (22) there is a hole (32), through which a ward piece (33) is resiliently urged inwardly to reach one of said slots (22). The projections are preferably ridged extending along the length of said key. Preferably ward piece (33) is inseparably fixed to one end of a spring reed (34), the other end of the latter being secured to the outer wall of bush (30) by, for example, welding or by a screw (not shown).
- To allow key (40) to be screwed into the lock through the spiral entrance (31), there is provided a spiral groove (43) extending across the projections (41), which spiral groove (43) is bitten into by the helical edge (31 1 ) of spiral entrance (31), thereby allowing the key to be screwed into the bush to reach cylinder. When the whole length of spiral groove passes through the spiral entrance, the key can be directly pushed axially so that the projections fit into their corresponding slots.
- With the projections, the enlarged end (42) of the key looks like a gear. However, unlike the gears, the width of each projection and the distance between any two adjacent projections may differ greatly at random, depending on the design of the slots (22). As all of the pitch and the lead angle of the spiral entrance, and the position and number of the slots may vary arbitrarily, the probability that a lock happened to be unlocked by the key of another such lock is extremely low, thus ensuring high security and reliability of this invention.
- An alternative modification of the key (40), designated by (40'), is also feasible. It has a spiral shank (43'), with a length of its front forming a plurality of projections at the outer side. To adapt to such modification, the slots (22) of cylinder (20) and the ward pieces (33) and holes (32) of bush (30) must be arranged in a spiral trajectory instead of a circumference. This is easy to understand, and therefore not illustrated in the drawing. However, the spiral shank must be structured so that it, before reaching the slots, can be pushed inwardly a short distance in axial direction to fit its projection into mating slots.
Claims (12)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT81103287T ATE11317T1 (en) | 1981-04-30 | 1981-04-30 | DETECTIVE CYLINDER LOCK. |
EP81103287A EP0064087B1 (en) | 1981-04-30 | 1981-04-30 | Cylinder lock resistant to picking |
DE8181103287T DE3168256D1 (en) | 1981-04-30 | 1981-04-30 | Cylinder lock resistant to picking |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP81103287A EP0064087B1 (en) | 1981-04-30 | 1981-04-30 | Cylinder lock resistant to picking |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0064087A1 EP0064087A1 (en) | 1982-11-10 |
EP0064087B1 true EP0064087B1 (en) | 1985-01-16 |
Family
ID=8187693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81103287A Expired EP0064087B1 (en) | 1981-04-30 | 1981-04-30 | Cylinder lock resistant to picking |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0064087B1 (en) |
AT (1) | ATE11317T1 (en) |
DE (1) | DE3168256D1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0189147A1 (en) * | 1985-01-18 | 1986-07-30 | John F. Masoncup | Padlock with tamper-actuated audible and/or inaudible alarm |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007030942A1 (en) * | 2005-09-15 | 2007-03-22 | Pinhead Components Inc. | Locking system with hidden keyed access |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE179910C (en) * | ||||
DE593541C (en) * | 1934-02-28 | Emil Gross | Key for security lock | |
US1526728A (en) * | 1923-11-23 | 1925-02-17 | Wagner Julius Stanley | Lock |
US1849070A (en) * | 1928-10-15 | 1932-03-15 | Buehner Christian | Padlock |
US2460551A (en) * | 1945-06-16 | 1949-02-01 | Gunnar E Swanson | Unitary tumbler cylinder lock |
US3320783A (en) * | 1966-12-09 | 1967-05-23 | Chicago Lock Co | Key for an axial tumbler type lock |
US4138868A (en) * | 1977-08-19 | 1979-02-13 | Richards Sr Frederick F | Replaceable cylinder padlock |
-
1981
- 1981-04-30 EP EP81103287A patent/EP0064087B1/en not_active Expired
- 1981-04-30 DE DE8181103287T patent/DE3168256D1/en not_active Expired
- 1981-04-30 AT AT81103287T patent/ATE11317T1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0189147A1 (en) * | 1985-01-18 | 1986-07-30 | John F. Masoncup | Padlock with tamper-actuated audible and/or inaudible alarm |
Also Published As
Publication number | Publication date |
---|---|
DE3168256D1 (en) | 1985-02-28 |
EP0064087A1 (en) | 1982-11-10 |
ATE11317T1 (en) | 1985-02-15 |
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