A LOCK DEVICE

Abstract: A lock device is described. It comprises a first (2) and a second (3) lock element, concentric around a first symmetry axis, mutually turnable, at least partly in the form of a straight circular cylinder (6), embracing a second straight cylinder (10), at least two cooperating radial channels (18, 19) being provided, guiding two radially inwardly spring (21) loaded lock pins (24, 25), in a certain radial position releasing the mutual rotation of the lock elements (2, 3), and a key means (4). The key means (4) is designed like a straight pipe (28), provided with an opening (31) arranged and dimensioned to take up a first ball element (26) when the opening (31) stands just in front of the second channel (17). The opening (31) is provided, at one of its sides perpendicular to the symmetry axis (1), with a radially outwardly sloping recess (32) so that when the key means (4) led downwardly, is turned in one direction, the first ball element (26) grabs in the opening (31) so that the second lock element (3) can be turned by the key means (4) in relationship to the first lock element (2), as far as the lock pins (25, 26) admit this, the pipe (28) being locked axially by the fourth pin (23) and the first ball element (26).

Description: A lock device The present invention relates to a lock device comprising a first and a second lock element, concentric around a first symmetry axis, mutually turnable, not axially displaceable, at least partly in the form of a first straight circular cylinder, embracing a second straight cylinder, at least two cooperating radial channels being provided, guiding two radially inwardly spring loaded lock pins, in a certain radial position releasing the mutual rotation of the cylinders, and a key means. There is demand for such a lock device, that is safe against picking but is yet relatively simple in construction. According to the invention such a lock device is characterised by the feature given in the enclosed patent claim. The invention will be described in the following, reference being made to the attached schematic figures, of which: figure 1 shows a side view in an axial section of a first embodiment of a lock device, figure 2 shows a key means, figure 3 shows an enlarged detail of the key means in figure 2, figure 4 shows, in an enlarged scale, the lock means in figure 1, figure 5 shows a plane view of cross sections of a second embodiment of a lock device, and figure 6 shows a corresponding side view, partly in axial section. In the figures 1 - 4, showing a first embodiment of the lock device according to the invention, first and second lock elements, mutually turnable around a first symmetry axis 1, are marked by 2 and 3 and a key means by 4. The first lock element 2 comprises a disk 5, rotationally symmetrical around the symmetry axis 1, with a first relatively large radius rl, a ring body or cylinder 6, standing up axially from the disk, the inner wall 7 of which cylinder is parallel to the symmetry axis 1, with a radius r2, r2 being > rl, so that the ring body has a relatively thick wall, an inner straight cylindrical rotationally symmetrical body 8, the outer mantle 9 of which is parallel to the symmetry axis 1, with a relatively small radius r3. The second lock element 3 comprises a ring 10 with an inner wall 11 parallel to the symmetry axis, with a radius r4, a ring slot 12 with the radial thickness r4 - r3 = d being formed between the body 8 and the ring 10. This shows an outer wall 13, parallel to the symmetry axis 1, with a radius r5, somewhat smaller than r2. The ring 10 is provided, at the upper portion, with a ring flange 14, which is provided to glide over the upper limiting surface 15 of the ring body 6. The first and second lock elements are formed with two cooperating radial channels 18 and 19, guiding two lock pins 24, 25, radially inwardly spring loaded by a spring 21, in a certain radial position releasing the mutual rotation of the lock elements. The lock pins 24 and 25 press against a ball element 27, which in the locked position of the lock elements rests at the outer mantle 9 of the body 8. There are provided two more cooperating radial channels 16 and 17, guiding two third and fourth pins 22 and 23, radially inwardly loaded, by a spring 20, which pins function as driver pins. They act, in the radially inner end, upon a ball element 26, the movement inwardly of which being limited by the mantle surface 9 of the body 8. The key means 4 is formed like a straight pipe 28, with such a dimension, that it may be led parallelly with the symmetry axis 1 downwardly in said ring slot 12 to gliding contact with the upper wall 29 of the disk 5, the pipe 28 being provided, in its lower, outer end with an axially extending recess 30, the bottom of which is located at such a radius r6 from the symmetry axis 1, that the recess 30 via the second ball element 27 brings the lock pins 24 and 25 in a such a radial position, that the first and second lock elements may be turned freely mutually. The pipe 28 is also provided with an opening 31 dimensioned to take in half of the first ball element 26 when the opening 31 stands just in front of the second channel 17. The opening 31 is, at one side perpendicular to the symmetry axis 1, provided with a radially outwardly sloping recess 32, see figure 3, in such a way, that when the key means 4, led downwardly, is turned in one direction, the first ball element 26 grabs the opening 31 so that the second lock element 3 can be turned by the key means 4 in relationship to the first lock element 2, as the lock pins 24 and 25 admit this due to the radial displacement of them. The pipe 28 is thereby locked axially by the second pin 23 and the first ball element 26. When the key means contrarily is turned in the other direction, till the first and second pins 22 and 23 stand just in front of each other, the pipe 28 can be turned free from the first ball element 26, which by the recess 32 when turned is brought to be radially pressed outwardly so that the key means can be removed from the lock device. With this design the key means can only be drawn from the lock means when this is in a locked position, otherwise not. It is suitable to provide a lock ring with the grooves marked by 33, in order to prevent an axial movement between the lock elements 2 and 3. It may also be suitable to provide a flexible sealing ring in the groove marked by 34, preventing impurities from entering the lock device, but admitting the pipe 28 to be led downwardly into the ring slot 12. Of course the device can be provided with many more lock pins than those shown, 24 and 25, and corresponding longitudinal recesses at the pipe 28. Furthermore more than one pair of driver pins 22 and 23 may be provided. In the figures 5 and 6 there is shown a lock device with one pair of driver pins 22 and 23 and 8 pairs of lock pins, in three groups, of which only the lock pins 24 and 25 are shown. As is obvious from figure 6 the driver pins and lock pins are provided at three axial levels, I, II and III. A bow groove 35 and an axial protrusion 36 are provided at the first and second lock elements to prevent too large mutual turning movement between the first and second lock elements.

Claims: Patent claim A lock device, comprising a first (2) and a second (3) lock element, concentric around a first symmetry axis, mutually turnable, not axially displaceable, at least partly in the form of a first straight circular cyHnder (6), embracing a second straight cylinder (10), at least two cooperating radial channels (18, 19) being provided, guiding two radially inwardly spring (21) loaded lock pins (24,25), in a certain radial position releasing the mutual rotation of the lock elements (2,3), and a key means (4), characterised in that a central straight cylindrical body (8) with an outer mantle surface (9) is provided, so that there is a straight cylindrical ring slot (12) between the body (8) and the cylinder (10), ball element (27) being provided in the channel (19), spring (21) loaded, supported by the mantle surface (9), at least two more cooperating channels (16, 17) being provided, guiding two radially inwardly spring (20) loaded third and fourth pins (22,23) in the radially inner end acting upon a ball element (26), the movement of which inwardly is prevented by the mantle surface (9), the key means (4) being designed like a straight pipe (28) with such a dimension, that it may be led parallelly to the symmetry axis (1) downwardly into said ring slot (12), the pipe at its lower outer end being provided with at least one axial longitudinal recess (30), the bottom of which is located at such a radius (r6) from the symmetry axis (1), that the recess (30) via the second ball element (27) brings the lock pins (24,24) into such a radial position, that the first and second lock elements (2,3) can be turned mutually freely, the pipe (28) being provided with an opening (31) arranged and dimensioned to take up the first ball element (26) when the opening (31) stands just in front of the second channel (17), the opening (31) being provided, at one of its sides perpendicular to the symmetry axis (1), with a radially outwardly sloping recess (32) so that when the key means (4) led downwardly, is turned in one direction, the first ball element (26) grabs in the opening (31) so that the second lock element (3) can be turned by the key means 4 in relationship to the first lock element (2), as far as the lock pins (24,25) admit this, the pipe (28) being locked axially by the fourth pin (23) and the first ball element (26), whereas, when contrarily the key means (4) is turned in the other direction until the third and fourth (23,24) stand just in front of each other, the pipe (28) may be turned free from the first ball element (26), which by the recess (32) at the turning is brought to be pressed radially outwardly.

Inventors: DYHLEN KENNETH, DYHLEN, KENNETH
Applicants: DYHLEN KENNETH, SAHLEN ANITA, DYHLEN, KENNETH, SAHLEN, ANITA
Application year: 1998
Main classification: E05B21
IPC codes: E05B11, E05B19, E05B27, E05B35