Abstract:
A control device for a magnetic cylindrical lock having a cylindrical housing and a cylindrical plug disposed for rotational and axial movements in the housing, comprises a longitudinal bore in the plug, magnetic rotary members arranged for rotation across the longitudinal bore, and arresting means for blocking the rotation of the plug in one axial position of the latter and for permitting the rotary movement in another axial position.

Description:
This is a division of application Ser. No. 12,895, filed Feb. 16, 1979. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates generally to an arresting control device and more particularly it relates to a control device for a magnetic cylinder lock having a stationary cylindrical housing and a rotatable plug arranged in the housing. 
     SUMMARY OF THE INVENTION 
     The primary object of this invention is to provide an improved control device which permits the actuation of the plug in a lock with a magnetically coded key, whereby the decoding of the lock is rendered more difficult. 
     In keeping with this object, and others which will become apparent hereafter, one feature of the invention resides in the provision of a cylindrical plug which, in addition to rotational movement is also axially displaceable between two axial positions in the housing whereby arresting means disposed between the plug and the housing are operable for blocking the rotary movement of the plug in one of the axial positions and for unblocking in this rotary movement in another axial position. 
     Preferably, the cylindrical plug cooperates with a cylindrical sleeve which is interposed between the plug and the housing and is provided with an axial groove which engages with a radial extension of the cylindrical plug so that in the unblocking position the sleeve rotates together with the plug. In the blocking position, the extension is guided in an axial groove in the housing so that the rotation of the sleeve and of the plug itself is prevented. 
     The plug has a central key channel and longitudinal bores extending parallel with the central channel and communicating with transverse or radial blind bores. In each blind bore, a magnetic rotary member or rotor is supported for rotation about an axis which extends perpendicularly to the key channel. The magnetic rotary members intersect the longitudinal bores and are provided with diametrical bores which, in a particular angular position of the rotary member are coaxial with the center axis of the longitudinal bore. A plurality of discrete arresting elements are arranged in the longitudinal bore between respective rotary members and also in the diametrical bores of the latter. In the aligned position of the diametrical bores with the longitudinal bore, the arresting elements contact each other and abut against terminal walls of the housing or of the rotary sleeve. The cylindrical plug is axially biased by spring means for example, into an inoperative position in which at least one rotary member is misaligned with the longitudinal bore and the arresting elements of the control device prevent the axial displacement of the plug. If, by the insertion of a properly coded key, the rotary members are turned in such a manner as to have their diametrical bores in alignment with the longitudinal bore, the plug can be axially displaced into an operative position in which it is permitted to rotate about its axis thus activating a locking bolt. 
     In a modification of this invention, instead of slidable arresting elements there are provided longitudinal arresting beams facing longitudinal grooves on the outer surface of the cylindrical plug and being rotatable therewith. A plurality of arresting bolts project in radial direction from the arresting beams into the longitudinal groove and cooperate with matching recesses in the magnetic rotary members to block in one axial position of the plug the axial displacement of the latter and in another axial position to unblock this axial displacement. 
     The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing. 
    
    
     BRIEF DESCRIPTION OF THE DRAWING 
     FIG. 1 is a sectional side view of a magnetically controllable cylindrical lock including the control device of this invention, taken along the line I--I of FIG. 2; 
     FIG. 2 is sectional rear view of the lock of FIG. 1 taken along the line II--II; 
     FIG. 3 is a sectional front view of a cut-away portion of the lock of FIG. 1 taken along the line III--III; 
     FIG. 4 is a sectional side view of a cut-away portion of the lock of FIG. 1 showing another axial position of the control device; 
     FIG. 5 is a sectional side view taken along the line V--V of FIG. 6 showing another embodiment of the device of this invention; 
     FIG. 6 is a sectional rear view taken along the line VI--VI of FIG. 5; and 
     FIG. 7 is a sectional side view of a cut-away portion of the device of FIG. 5, taken along the line VII--VII. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The control device of this invention includes a stationary housing 5 defining a cylindrical passage in which a cylindrical sleeve 1 is rotatably supported. Each end of sleeve 1 is closed by a terminal plate 12 and 13 and in the cylindrical space inside the sleeve 1, a cylindrical plug 2 is arranged for rotation about its center axis and for axial displacement of about a distance indicated by double arrow 18. Plug 2 defines a central key channel 20 into which a magnetically coded key 19 is insertable from the left side. At each side of central key channel 20 a longitudinal bore extends parallel to the latter and communicates with radial blind borings 21 (FIG. 2) in which magnetic rotors or rotary members 9 are supported for rotation. The axis of rotation of each rotary member 9 coincides with the center axis of the assigned blind boring 21. Each rotary member 9 has a diametrical bore 8 which in one angular position of the rotary member is aligned with the longitudinal bore 7. In this embodiment the longitudinal bore 7 has a larger diameter than the diametrical boring. One end of diametrical boring 8 is conically extended to form a funnel-shaped portion 22 opening into the longitudinal bore 7. Cylindrical arresting elements 11 having a length correspondng to the diameter of rotary members 9 are slidably arranged in respective diametrical bores 8 and cooperate with spherical arresting elements 10 arranged in the longitudinal bores 7 between respective rotary members 9. As is apparent from FIG. 1, the dimensions of respective arresting elements 10 and 11 are such that cylindrical pins 11 can freely project from their diametrical bores 8 into the adjoining sections of longitudinal bore 7 but the arresting balls 10 can enter only the funnel-shaped portion 22 of the rotary members 9. 
     The end of plug 2 facing the rear cover plate 13 is provided with a radial extension 3 which projects through a recess 23 in sleeve 1 into an axially directed groove 4 in the inner wall of housing 5. This axial groove 4 communicates with an annular groove 6 provided in the inner wall portion of housing 5 for guiding the extension 3 so that this extension together with plug 2 and sleeve 1 can be rotated by key 19 about a common center axis. This rotary movement, however, is possible only in the position of plug 2 in which the diametrical bores 8 of rotary members 9 are aligned with longitudinal bore 7 and plug 2 is axially displaced to the right as illustrated in FIG. 1. If plug 2 is shifted to the left, the extension 3 is out of alignment with annular groove 6 and axial groove 4 prevents the rotation of the plug. 
     A pressure spring 14 arranged in a central opening of terminal plate 13 urges a spring pin 24 against the center of the base of plug 2 and pushes the latter to the left. To facilitate the movement of plug 2 in sleeve 1, a jacket 25 is interposed between the plug and the sleeve. The jacket reduces friction between the plug and the sleeve and also supports pivot points of rotary members 9. 
     In the inoperative or arresting position of plug 2 in which no key is inserted into the key channel, spring 14 axially displaces plug 2 to the left so that the latter abuts against the front cover plate 12. In this arresting position, radial extension 3 is situated at the left end of axial groove 4 past the annular groove 6. As has been mentioned above, in this left hand position the key 19 cannot rotate the plug 2 and sleeve 1. If a wrong key 19 is inserted into key channel 20, magnetic rotary members 9 have different angular positions in which the diametrical bores 8 are missligned with longitudinal bores 7 (FIG. 4) and consequently plug 2 cannot be shifted relative to arresting balls 10. If an incorrectly coded key is inserted and an axial pressure is exerted against plug 2, this axial pressure is intercepted by the balls 10 and rotary members 9 and plug 2 cannot be axially displaced to the right to resume its operative position. 
     If, however, a correctly coded key is used, the magnetic rotary members are rotated into their aligned position as illustrated in FIG. 1 and by exerting axial pressure by the key 19, the plug is displaced to the right whereby balls 10 partially enter the funnel-shaped portion 22 of diametrical bores 8 of magnetic rotary members 9. 
     By virtue of the arrangement of funnels 22 at one end of diametrical bores 8 only, the full arresting action of bolts 10 is ensured even if rotors 9 are turned through 180°. 
     A modification of this invention is illustrated in FIGS. 5 through 7. Instead of discrete arresting elements 10 and 11 this embodiment employs arresting beams 15 which are provided with arresting pins 17 projecting into the longitudinal passages or grooves 26 on the outer surface of plug 2. Arresting beams 15 extend in axial direction along the exterior flats on opposite sides of plug 2 and are fixedly connected to the rear cover plate 13. Consequently, the arresting beams 15 are not axially displaceable but they can be rotated by key 19 together with adjacent structures, i.e. with plug 2, end plate 13 and sleeve 1. Plug 2 is provided with the longitudinal grooves 26 in which the arresting pins 17 are guided so that plug 2 is only axially displaceable relative to the arresting pins. The cylindrical walls of magnetic rotary members 9 are provided with recesses 16 matching the arresting pins 17 so that the latter in a correctly aligned position of the rotary members can engage these recesses and the unlocking process in this operative position of plug 2 can take place in the same manner as described above in connection with FIG. 1. In other words, by pressing a right key 19 against the front base of plug 2 counter to the pressure of spring 14, the plug is axially shifted to the right so that extension 3 is in alignment with annular groove 6 and plug 2 can be rotated about its axis. 
     It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of constructions differing from the types described above. 
     While the invention has been illustrated in the specific examples of a cylindrical lock, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention. For example, several axial grooves 4 can be provided in the inner wall of housing 5 so as to enable an arresting rotation through 180° or 270°. Also, the annular groove 6 and the corresponding extension 3 can be arranged at different locations between the plug 2 and housing 5. It is possible to employ other rotation blocking means instead of the extension 3 such as for example, spring biased arresting bolts which are axially displaceable relative to the plug, or the plug can be also provided with displaceable plug portions. 
     What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.