HUE035562T2 - Key for a lock cylinder - Google Patents

Description

Öes&riptbo [0001] The invention relates to a Key for a cylinder lock with a shaft and a handle and with profile grooves arranged parallel to the shaft and located on mutually opposite broad sides of the shaft, [8002] Such keys are used, for example, sn leaking systems so cyhnder locks and are known. The broad sides of the shaft connect a key back with a key front. Looking notches are often arranged in the key front, and Interact with pin tumblers of the cylinder look, The profile groeves arranged in the broad sides correspond, as a rule, with a profile in a core of the cylinder lock and thus enable the key to be inserted Into the cylinder lock. As a result, It is possible to create the key by varying the variants of the profile grooves, for example for use in main key systems with different hierarchy levels. The broad aides may also be sensed by pin tumblers.

[0003] ÖB 3S 21 030 Ai discloses a key of the type mentioned above, wherein a region with a small distance between the broad sides is arranged near the free end of the shaft, while a regien with a large distance is arranged between the broad sides near to the handle. In addition,, the key in the front region, which is arranged near a key tip, allows an arrangement of profile grooves that Is different from that in the rear regien, which is arranged near the handle, The key may be generated by Joining two elements of different breadth. This increases the security of the key against copying. Furthermore, a different variation of the key, which may be used for main key systems, is made possible through different lengths of the front region relative to the rest of the Insertion length, [0004] A disadvantage of the known key is that the key may nevertheless be copied on conventional copying machines by simply measurtng the differenfiy-broad regions of the shaft. When copying, a front narrow shaft element and a rear wide shaft element are simply produced by conventional copying and the shaft elements are then connected to one another, [$08S] The Invention is based on the problem of developing a key of the type mentioned at the outset in such a way that copying is made more difficult [0888] This problem is solved according to the invention by the shaft having a tapered section wherein the tapered section extending outwards from the handle to the key tip produces o constant réduction h the thickness of the shaft wherein the shaft is thicket-near the handle than near the key tip.

[0007] With this conjuration, the tapered section of the shaft results in a signiScant dilf'icuity In copying the key according to the invention:. Conventional copying maohioes may only scan the profile at a single point. When this scanning Is attempted with the key according to the Invention, the copying machine either produces fee narrow or too wide a key. If the key Is too wide, the shaft can not be Inserted into the icck channel of the cylinder lock. A shaft that is too narrow may fee sensed by pin tumblers in the cylinder look end thus prevent locking with this key. If is not possible to assemble the key according to the present Invention from separate terminal elements produced with the conventional copying machine because of the tapered section.

[POOS] According to an advantageous development of the Invention, scanning of the shaft by means of a conventional copying machine results in different key profiles at different points when the profile grooves have constant depth throughout the entire length of the shaft. Conventional copying machinas are not capable of scanning such profiles. Therefore, a different profile depth is determined at each location of the shaft perpendicular to the longitudinal axis of the shaft during the scanning. However, since the shaft does not change discontinuously, hut according to the Invention, has a thickness which changes continuously, the shaft can not be approximated by conventional scanning machines by repeated scanning and copying. This configuration thus contributes to a partlculedy severe complication for tbs copying of the key according to the invention. [COS] The section tapering to the longitudinal axis could, for example, extend completely over the at least one broad side of the shaft. Thus, the shaft would be wedge-shaped and could be manufactured In an inclined clamping on a milling machine. If at leest one parallel section of the broad sides follows the tapered section, thw further complicates the copying df the key according to the invention. By virtue of this design, the position and the length ci the tapered section must be known by the copier cl the key according to the invention in addition to the type of tapering of the section, in ordes to produce a copy of the key according to the invention As an alternative to the parallel section of the broed sides, a section which lepers differently compared to the tapered section may also be provided [0010] When the tapered section is arranged in the centres region of the shaft,, end sí a parafe! section of the tapered ends adjoins the ends of the tapered section this farther complicates the copying of the key according to the invention.

[0011] The key according to the invention may be designed in a particnleriy high number of hierarchical stages if the tapered section is produced with an Inclination of both broad sides on the respective opposite width sides, in this case, the key may he constructed symrnetncaliy or havo differently inclined sections on he two width sides.

[0012] According to another advantageous development of the invention, the various sections of the shaft may he produced simply by the milling method if the transition of the tapered section to the parallel section of the broad sides has a radios.

[00131 According fa another advantageous development of the invention, the shaft. Is constructed in a particularly simple manner when the tapered section is designed as a bevel.

[0314] When the tapered section has a curvature, this further complicates the copying of the key according to the invention. As a result, the specific shape of the shaft is difficult to determine m the finished key, The difficulty of determining the specific shape of the shaft further restricts the possibility of copying, Preferably, the curvature is concave. The curvature may he produced, for example, by means of a cylindrical cutter with a particularly large radius.

[0015] The invention allows numerous embodiments. To further illustrate their basic principle, several of those era shown in the drawing ano era described below.

Fig. 1 shows a fey according io the invention in a side view,

Fig 2 shows a sectional view through the key according to the invention from Fig, 1 along the lino li t!,

Fig 3 shows a sectional view through the key according to the invention from Flo. 1 along tea line Ill-ill;

Fig. 4a shows a view of the key according to the invention from Fig. 1 on a key ba?:k.

Fig. 4a< 4c show several views on the key beck of further embodiments of the key according to the invention- [0016] Hg, 1 shows o key with &amp; shaft i end a handle 2 in a side view oh a broad side 3 of the shaft 1. The broad side 3 connects a key back 4 with a key front 5 and has a series of prodie grooves 0» The prodie grooves 3, ? extend over the entire shad 1', and: are provided for insertion into a cylinder look (not shown), A plurality of looking notches 3 Is arranged in the key front 5, and Is sensed by pin tumblers upon the Insertion of the key into the cylinder look. The free end of the shaft 1 facing away from the handle 2 Is designated as the key tip 3, (0317} Fig. 2 shows a sectional view through the shaft 1 of the key from Fig, 1 along the line I hl!, wherein profile grooves 6, 7 are arranged in two broad sides 3, 3' ef the shaft 1, Different profile grooves 6, 7,10,11 arranged side by side have a different depth, [001 3} Fig, 3 shews a sectional representation through the shaft 1 of the key from Rg 1 along the line 111411. It may he seen here that the shaft 1 is thicker near the handle 2 than near toe key tip 9, However, profile grooves 3,'7 10, 11 extending ever the length ef the shaft 1, have the same profile depth at each location.

[0013J Fig. 4a shows. In a view of the key hack 4 of the key from Rg,. 1,. that the shaft 1 has a tapered section 12. which is arranged at an angle to the longitudinal axis of the shaft 1, wherein the different thicknesses shown in Fig, 2 and 3 of the shaft 1 are produced. The shaft 1 is symmetrical. In this exemplary embodiment, the longitudinal axis Is formed by the axis of symmetry shown by dashed lines. Thus, the two width sides 3, 3’ of the shaft 1 are constructed identically. The shaft 1 has a parallel section 13 of the broad sides 3, 3· of constant thickness, which extends towards the key tip 9 at the inclined section 12, The transzon of the tapered section 12 to the constant thickness section 13 has a radius. [0020] Fig 4h shows a further embodiment of the key from Fig. 1 in a view of the key back 4 This differs from that of Fig. 4a in that one ef the broad sides 3’ is straight while the other of the broad sides 3 has a tapered section 14 with a curvature for producing the different thicknesses of the shaft 1 shown in Fig, 2 and 3. The tapered section 14 extends over the entire length of the shaft 1 and may be produced, for example, by a cylindrical cutter with a particularly large radius R, [00211 Fig. 4c shows a further embodiment of the key from Rg. 1 irr a view onto the key back 4. in which a tapered section 15 of the shaft 1 is arranged between two sections 13. 17 of constant thickness. Ona of the broad sides 3’ of the shaft 1 is straight, while tire different sections 15 -17 ere produced by the shaping of the other broad side 3. in an eitefnetive embodiment (not shown), the inofined section Id may also extend over the entire iengfh of the shaft 1 -

Claims (8)

SZA 8ADALM I YPONTOK KULK ONE 2! UNDER 1. A key for a locked Under with a stem <1} and a gripper (2) at its wide opposed sides of the shank (1), which is folded away, and disposed parallel to the shaft (1), characterized in that the sledge t 1} has a tapered section (12, 14, 15), and that the tapered section f 12, 14, .15. generates a lateral thinness, and that the stem Π) is thicker than the grip portion 12} than the apex of the key (9). 2. The key according to claim 1, wherein said pro (s, 7, 10, 11), s ^ nt, J! n-hex Ίθ '^ / ao <g {gtuto.> sneakers nto morning tcud, comtek 3. A key according to 1 or 2, characterized in that the thinning UW P is Is <t 'o okiam-e t'bit "dt, to S, S η, P 16, 17) connects 4. The key according to one of the preceding Claims, characterized in that the thin ribbed section (14) is configured for the center passage of the shaft (1), and that the tapering section (14) is in each case the broad sides (3, 3 ') ) is connected to a parallel section (16,1.7}). 5. The knies according to V do / ο tgenxpoutoh cgytko, characterized in that the slope of the echo-ridge section <J2} tntndfct szdcs relative to the opposite side of the opposite wide side □, 3 ') with which it is crushed. A key according to any one of the preceding claims, characterized in that the thinning <RTIgt; n oo ns, o J <transition. The key according to one of the preceding claims, characterized in that the thinning v \ t i L ·, I "· 'as the address of e KulaKítsa 8. One of the preceding claims, characterized in that the tapering <·> ä + <, ZS is a slash. ,>, 1 »Hi {ï 5>