MXPA97008843A - Removable nucleo of cilin lock - Google Patents

Abstract

The present invention relates to a removable cylinder lock core, with a cylinder lock cover and a removable cylinder lock core (20) inserted in the cover. The lock core has a solid upper part (22) with a row (25) of holes for receiving the tumblers and mobilizers (26, 66) and a lower part (23) defining a cylindrical bore (24), in which the cylinder (60) of the key, rotatable, is placed. The lower part (23) defines a cylinder bore (24) of the cylinder lock core (20), which is partially offset so as to form an axially elongated chamber (30) accommodating a member (40) movably retained transversely. and which leaves a portion (23a) of continuous bottom wall. The retaining member has an axial length, which corresponds to at least half of the axial length of the row (25) of the holes in the upper solid part, and a limited circumferential extension, which is substantially supplementary to the lower continuous wall portion so as to define a cylindrical perforation (24)

Description

REMOVABLE NUCLEUS CYLINDER LOCK DESCRIPTION OF THE INVENTION The present invention relates to a removable cylinder lock core, comprising a cylinder lock cover having an axially extending cavity, a removable cylinder lock core which can be inserted axially into the cavity, the core The lock has a solid upper part with a row of holes for housing immobilizing tumblers, and a lower part defining a cylindrical bore extending axially therethrough, a cylindrical, rotatable wrench cylinder located in the cylindrical bore and having slot for longitudinal key, for receiving a key cooperating with the immobilized tumblers, a retaining member that can move transversely between a first position in which positively immobilizes the lock core in its axially inserted position, and a second position, in which the lock core can be retracted, the member or retainer has a transversely extending attachment projection, which engages with the cover when the retention member is in its first position.

REF: 26219 Such a cylinder lock with a removable core is previously known from US Patent No. 4,328,690 and the corresponding reissued patent No. RE 31910 (Medeco Security Locks Inc.). High safety is obtained by means of the side bar or pin, which moves between a release position within a groove in the cylindrical outer surface of the rotatable key cylinder, and a fixing position which engages a recess adjacent to the cylindrical perforation of the lock core. Normally, the side bar is placed in its fixation position, whereby both the pivotable key cylinder and the retaining member are prevented from moving. Only when the six immobilized tumblers are lifted and rotated in specific elevational and rotational positions, immobilized tumblers will be placed with their end surfaces in the cutting line defined by the outer cylindrical surface of the key cylinder and will rotate to such rotational positions. so that the side bar is allowed to enter with its projections in the vertical grooves in the tumblers, so that the side bar can be driven to its release position and the key cylinder can be rotated by means of a wrench. proper operation inserted into the key cylinder key slot. During such normal operation, the retaining member will remain in place in its first position, in which it positively retains or fixes the lock core axially in the cavity of the lock cylinder of the cover. The retaining member is formed as a ring or a sleeve, which encompasses the key cylinder circumferentially rotatable around it, and is provided with several holes in alignment with some of the holes that fit the upper portions of the tumblers immobilized. The latter will be partially placed in a hole in the lock core and partially in a corresponding hole in the retaining sleeve. In addition, the retaining sleeve constitutes a moving middle section of the lower part of the core. lock that defines a cylindrical bore extending axially therethrough. It is provided with a recess extending axially on its inner cylindrical surface, the recess being aligned with corresponding recess portions, extending axially and longitudinally on the inner cylindrical surface of the lower part of the lock core. When the removable cylinder of the lock core is to be removed from the lock cover of the cylinder, a special control key is used, by means of which the immobilized tumblers are raised in positions with their end surfaces located in the line of cutting between the retaining sleeve and the upper solid part of the lock core. further, to allow rotation of the retaining sleeve, the six tumblers must be rotated to positions that allow the lateral bar to move laterally in its groove, on the outer surface of the rotatable key cylinder. Otherwise, the side bar will be retained in its fixing position, in which it engages with the axial recess of the retaining sleeve and prevents the key cylinder and the retaining sleeve from rotating. Although the lock of the prior art provides high security, there are certain disadvantages involved in its structure. In particular, the cylindrical perforation is axially divided by the retaining sleeve which forms a movable middle section located between two stationary end sections of the lock core. Therefore, it is difficult to obtain an accurate, well-defined guide to the rotatable key cylinder and maintain structural strength and wear resistance. In addition, the retention sleeve will only be held in place by some immobilized tumblers (normally two), which prevent rotation of the holding sleeve, during normal operation of the lock (when turning the key cylinder with the appropriate key). In addition, the division of the longitudinal recess for the side bar or pin in the two end portions located in the lower part of the lock core and the middle portion placed inside the retaining sleeve may present problems of proper alignment and such recess longitudinal split does not provide a good and accurate support for the side bar in its retention position as a longitudinal recess formed in a unitary wall portion. Based on the above, the main objective of the present invention is to provide a removable core for improved cylinder lock of the general class indicated in the opening paragraph, in which the key cylinder, and the retainer member are maintained in a manner secure in place, rotation of the same by the holding tumblers is avoided during the normal operation of the lock. At the same time, the structure must be robust and wear resistant, with relatively thick walls of the lock core and the retaining member, and the manufacture and assembly of the various parts must be simple and inexpensive. In addition, the lock must allow the use of a lock system that has a large number of variation possibilities for the control keys.

A secondary objective of the invention is to obtain a structure that includes a side bar, in which the side bar is held in a better way and more precisely in its retention position inside the core of the lock. The main objective is obtained by means of a removable cylinder lock core of the present invention, in which the lower part defines the cylinder bore of the cylinder lock core which is partially cut off so as to form a housing chamber the retaining member transversely movable and leaving a continuous bottom wall portion, which partially encircles the rotatable key cylinder and extends axially along substantially the entire length of the cylindrical bore, and in which the member The retainer has an axial length, which preferably corresponds to at least half of the axial length of the row of holes in the upper solid part, and a limited circumferential extension which is substantially complementary to the continuous lower wall of way they define cylindrical perforation. Compare claims 1, 2 and 3. Therefore, the retaining member is not formed as a sleeve which completely surrounds the key cylinder. Instead, the chamber houses a retention member, and the retention member itself has a limited circumferential extension, for example of approximately 180 °. The remaining continuous bottom wall portion of the cylinder lock core is dimensioned so as to partially surround the key cylinder and hold the key cylinder along substantially the entire length thereof. The axial length of the retaining member allows at least half of the tumblers in the row to fix the retaining member in its first position in which they positively retain the lock core in the cover. Normally, or four tumblers (of a total of six in the row) participate in this fixing action. The various parts are easy to manufacture and the overall structure is robust and resistant. In addition, because the number of tumblers involved in the attachment coupling of the retention member, typically three or four such tumblers, the number of variation possibilities for the control keys is relatively large. When the key cylinder includes a side bar, the latter can cooperate directly with the tumblers immobilized in the central row of holes in the key cylinder, or can cooperate with separate lateral tumblers housed in associated cavities formed in the key cylinder on one or both sides of the key slot. In a preferred embodiment, the retaining member comprises a base portion, which is substantially formed as a cylindrical part cover with external and internal cylindrical surfaces, and a radially outwardly projecting portion that constitutes the fixation projection. Compare claims 4 and 5. In principle, the retention member can be displaceable by translational movement laterally between the first and second positions. However, it is preferable that the holding member is rotatable between the first and second positions, an upper convex cylindrical surface is in sliding contact with the concave cylindrical surface in the upper solid part of the lock core. Compare claim 6. Then, the retaining member can be moved to its second position, in which the lock core can be retracted by means of a control key cooperating with the portions of tumblers partially placed in the holes in the body. retention member.

Additional advantageous features are set forth in claims 7 to 14. The invention will be explained more fully in the following, with reference to the accompanying drawings which illustrate a preferred embodiment. Figure 1 shows a perspective view of a cylinder lock cover and a removable cylinder lock core to be inserted in the cover, - Figure 2 illustrates, likewise in a perspective view, the basic parts of the core Removable cylinder lock shown in Figure 1, these parts are partially separated from each other for clarity; Figure 3 is a side view of the core body shown in Figures 1 and 2; Figure 4 is an opposite side view of the core body; Figure 5 is a cross-sectional view taken along the line V-V, in Figure 3; Figure 6 is a cross-sectional view taken along the line VI-VI, in Figure 4; Figure 7 is a perspective view of the retention member shown on the other side in Figure 2; Figures 8 and 9 are end views of the lock core illustrating the movement of the retention member in its second release position; Figures 10 and 11 are corresponding end views illustrating the normal operation of the cylinder lock. In Figure 1, a conventional cylinder lock cover 10 is shown having an axially extending cavity 11 for receiving a removable cylinder lock core 20 with a rotatable key cylinder 60 and a key 99. The cover 10 is designed to be mounted permanently on a door (not shown) or some other object to be fixed in relation to the frame or some other stationary structure. Alternatively, the cover 10 may constitute a padlock or some other lock device. The removable cylinder lock core 20 is inserted axially into the cavity 11 of the cover 10 and retained in the cover by means of a retaining member 40 which will be described further below. Upon insertion of the lock core 20 into the cover 10, the rear end of the key cylinder 60 cooperates, for example, by means of an axially projecting member (not shown), with a secondary fixing mechanism of any type.

In the illustrated embodiment, the cavity 11 has a cross-sectional shape substantially similar to an "8", corresponding to the cross-sectional shape of the lock core 20, so that the latter fits slidably into the cavity 11. The inner bore defining the cavity 11 has a recessed portion 14 (indicated by dashed lines in Figure 1) with which the fixing projection 50 extends transversely of the retaining member and engages to retain the lock core 20 in its inserted position. In the exploded view of Figure 2, the various parts of the cylinder lock removable core 20 are easily visible. The core body 21 (cf. also Figures 3, 4, 5 and 6), comprises a solid upper part 22, a lower part 23 defining a cylindrical bore 24 extending axially therethrough. In the vertical central plane of the upper part 22, there is a row 25 of six perforations 25a, 25b, 25c, 25d, 25e and 25f to accommodate the upper portions 26 of the immobilized tumblers, which are diverted in a conventional manner by springs 27 helical associated. The rotatable key cylinder 60 has a corresponding row of holes 65a, 65b, 65c, 65d, 65e and 65f which are in alignment with the corresponding holes 25a-25f in a holding or fastening condition. The lower portions 66 of the immobilized tumblers are placed in the holes 25a to 25f. The retaining member 40, which is slightly shorter in its axial length, has a corresponding row 55 of four holes 55c, 55d, 55e and 55f, likewise in alignment with the corresponding holes in the rows 25 and 65. In the cylinder 60 of rotatable key there is also a row 67 of lateral tumblers, for example, sic such side tumblers, located in corresponding cavities inside the key cylinder 60 so that they can be moved elevationally in a vertical plane B in parallel and can be moved slightly laterally in relation to the vertical plane A through the slot 68 of key and row 65 of perforations for tumblers. As known per se, the side tumblers are specifically raised by the appropriate key 99 and cooperate with the side key 80, which is located in a longitudinal groove 69 in the cylindrical outer surface of the rotatable key cylinder 60. In its retaining or fixing position, the side bar 80 projects transversely outwards and engages the corresponding longitudinal recess 29 in the lower part 23 of the lock core 20. When all the side tumblers 67 are suitably raised, the side bar 80 can be driven laterally into the slot 69 while allowing the projections 81 to fit within the corresponding recesses 70 in the side surface of each side tumbler 67. Such operation of the side bar between the fixing position and the releasing position is previously known per se, for example, from WO 94/01643 (Widén). According to the present invention, the member The retainer 40 has a special structure that allows the associated core body 21 to include a lower wall portion 23a, which extends axially along the entire length of the cylindrical bore 24. Along an axial length, which corresponds to the axial length of the retaining member 40, the lower part 23 of the core body 21 is partially repeated by cutting or exploding, as evidenced in Figures 2, 3, 4 and 6, so as to form a chamber 30 that houses the retaining member 40. The exploded portion extends from the trailing end of the core body 21 and has a circumferential extension of approximately 180 ° and extends upwardly in the upper bulk portion 22 of the core body 21. Here, the housing chamber 30 is defined by a concave cylindrical surface 31 which is joined to an axially limited recess 39 dimensioned to receive the radially projecting fixing projection 50 of the retaining member. On one side (to the left in Figure 6) of the continuous lower wall portion 23a, the wall portion extends upward to form a longitudinal edge surface 32 located vertically above the central axis C of the cylindrical perforation 24. . The longitudinal edge surface 32 constitutes an abutting surface, which defines a first position of the retaining member that fixes the lock core 20 in its axially inserted position. On the other side (to the right in Figure 6), the continuous lower wall portion 23a has a longitudinal edge surface 33 with tooth portions 34 spaced approximately at the level of the central axis C. Compare figure 3. The edge surface 33 constitutes abutting surface portions defining a second position of the retaining member, in which the projecting rod 50 is completely housed in the upper recess 32 so as to allow axial retraction of the lock core 20 as a unit. The retaining member 40 comprises a base portion 41, which is substantially formed as a cylindrical part cover with external and internal cylindrical surfaces 42 and 43, respectively, the retaining projection 50 projecting radially outward from the portion 41 of base. On one side (to the left of Figure 7), the partially cylindrical base portion 41 has a substantially straight longitudinal edge 44 which abuts the longitudinal edge 32 in the first position of the retaining member 40. On the other side (to the right in Figure 7), the partially cylindrical base portion 41 has a longitudinal edge 45 with downward projecting fingers 46, which fit between the teeth 34 at the longitudinal edge 33. When the retaining member is located in its second position, the edge portions 45 abut the surface portions 33. The upper outer cylindrical surface 42 corresponds to the curvature of the concave cylindrical surface 31 in its upper solid portion 22 of the core body 21. Therefore, the retention member can rotate between its first and second positions and at the same time maintain a sliding contact between the cylindrical surfaces 42 and 31. Further, through such rotational movement, the inner cylindrical surface 43 of the retainer member will define a wall portion of the cylindrical bore 24 as a supplement to the interior surface of the continuous bottom wall portion 23a of the core body 21. The circumferential dimensions of the continuous wall portion 23a in the base portion 41 of the retaining member 40 are such that the retaining member 40 can rotate between the first and second positions through an angle so that the attachment projection 50 it moves from a first retention or fixation position (compare Figure 8) to a second release position (compare Figure 9) in which it is fully accommodated in the recess 39. In the illustrated embodiment, as is evident from Figure 7, the projecting projection 50 is formed as a fin, and has portions 50a, 50b of large opposing surfaces (compare Figure 2) which can make contact with the corresponding surface portions of the recesses 39 in the core body 21 and the recess 14 in the cover 10, respectively, when the retaining member 40 is rotated to its first fixing position. During the rotary movement, fingers 46 and teeth 34 overlap each other circumferentially. The recess 29 (or the separate recess portions) for engaging the side bar 80 is completely formed on the interior surface of the continuous bottom wall portion 23a. This makes possible the fact that the wall portion 23a extends axially, substantially along the entire length of the cylindrical perforation 24 in the region corresponding to the normal position of the lateral bar 80 projecting outwards. In the illustrated example, the side bar 80 is normally located at the same level as the central axis C, therefore, the interior wall portion 23a continuous, as a whole, is inclined in relation to a transverse plane D, which is perpendicular to the vertical plane A through the central axis C (which defines the cylindrical perforation 24) and the row 25 of perforations in the solid upper part 22 of the core body 21. The operation of the lock will become apparent from FIGS. 8 to 11. By using a control key, the side tumblers 67 and the tumbler bolt portions 66 and 26 are raised to the positions in which the ends The upper portions of the lower tumbler pin portions 66 are all located in the cutting line between the cylindrical surfaces 31 and 42, whereby the key cylinder 60 together with the retaining member 40 can be rotated to the position that shown in Figure 9. Then, the retaining projection 50 is received in the recess 39, so that the lock core 20 can be retracted axially as a unit of the cover 10 (with the proviso that all the tumblers are properly aligned). Figures 10 and 11 illustrate the normal operation of the lock by means of an operation key. Then, the portions 66 of lower tumbler bolts are raised only to the cutting line corresponding to the interior surface 43 of the retaining member 40. Therefore, the retaining member will remain in its first position, in which it positively immobilizes the lock core 20 in its axially inserted position. The upper immobilizer tumbler bolt portions 26, which extend through the holes 25c, 25d, 25e and 25f, as well as the holes 55c, 55d, 55e and 55f (Figure 2), prevent the retainer member from rotating. . Therefore, only the key cylinder 60 can be rotated by means of a suitable operating key. The removable cylinder lock described above can be modified by those familiar with the art within the scope of the appended claims. In the illustrated embodiment, the housing chamber 30 is cut away from an axial end of the lock core 20. This will facilitate the machining of the walls of the chamber and the assembly of the retaining member 40. However, alternatively, the housing chamber can be confined to the middle section of the lock core 20. It is advantageous if the retaining member 40 has a substantially axial length, preferably approximately half the axial length of the bore 24 or even larger. Thus, many orifices (usually 3 or 4) can be provided in the retention member in a row, whereby the latter is held securely and accurately in position by the tumblers. The holding projection of the retaining member 40 can alternatively be shaped as a tangential (and possibly slightly radial) projection as well., especially in the case where the movement of the retention member is not strictly rotational, but at least partially translational. The recess 29 for coupling the side bar does not necessarily have to be longitudinal and continuous. Instead of this, it can be constituted by several separate recess portions in a row. In addition, naturally, there may be two side bars on the key rod and the corresponding recesses in the continuous bottom wall portion.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which it relates. Having described the invention as above, property is claimed as contained in the following:

Claims (10)

1. A removable core for cylinder lock, comprising a cylinder lock cover having an axially extending cavity, a removable cylinder lock core which is axially insertable into the cavity, the lock core has a solid upper part , with a row of holes for housing immobilized tumblers, and a lower part defining a cylindrical bore extending axially therethrough, a cylindrical, rotatable key cylinder, located in the cylindrical bore and having a key slot longitudinal, to receive a key that cooperates with the tumblers, immobilized, and a retaining member, which moves transversely between a first position, in which positively immobilizes or fixes the lock core in its axially inserted position, and a second position, in which the lock core can be retracted, the retention member has a salt a transversely extending retention member, which engages with the cover when the retention member is in the first position, in which the lower part defines a cylinder bore of the cylinder lock core that is partially separated by cutting or sliding so as to form an axially extending chamber, which houses the retaining member transversely movable and which leaves a continuous lower wall portion, which partially encircles the pivotable key projection extending axially along substantially the entire of the length of the cylindrical perforation; and the retaining member has a limited circumferential extension, which is substantially supplementary to the continuous lower wall portion so as to define the cylindrical perforation, - the core is characterized in that: the housing chamber is cut off from an axial end of the core of lock and extends upwardly in an adjacent recess in the upper solid part of the cylinder lock core, the recess is axially limited between the opposing surface portions of the upper solid part and is sized to receive the fixing or retaining projection; the retaining member is axially elongated and comprises a base portion, which is located in the receiving chamber and from which the retaining projection projects radially outwardly in the form of a fin having large surface portions, which correspond to the opposite surface portions of the upper solid part; and the fin-shaped retention projection is fully received in the recess when the retention member is located in the second position.

2. The removable core for cylinder lock, according to claim 1, characterized in that the retaining member has an axial length, which corresponds to at least half the axial length of the row of holes in the upper solid part.

3. The removable core for cylinder lock, according to claim 1 or 2, characterized in that the housing chamber is cut out or cut by cutting the rear end of the lock core.

4. The removable core for cylinder lock, according to any of claims 1 to 3, characterized in that the base portion is substantially formed as a cylindrical part cover with internal cylindrical surfaces.

5. The removable core for cylinder lock, according to claim 4, characterized in that the housing chamber is defined upward by a concave cylindrical surface and in that the retaining member has a corresponding convex upper cylindrical surface, the retaining member is rotatable between the first and second positions with a sliding contact between the concave and convex surfaces.

6. The removable core for cylinder lock, according to claim 5, characterized in that the circumferential dimension of the base portion is smaller than the circumferential dimension of the housing chamber and why the base portion and the bottom wall portion It has longitudinal butt surface portions defining the first and second positions of the retaining member.

7. The removable core for cylinder lock, according to claim 6, characterized in that the abutting surface portions are formed in circumferentially superimposed, but longitudinally displaced edge portions of the retaining member, and the lower wall portion, respectively.

8. The removable core for cylinder lock, according to any of claims 1 to 7, wherein the key cylinder has a side bar, the side bar can be moved between a release position within a groove in the outer surface cylindrical of the rotatable key cylinder, and a fixing or retaining position engaging a recess adjacent to the cylindrical bore of the lock core, the core is characterized in that the recess for coupling the side bar is formed completely on the inner surface of the portion lower continuous wall.

9. The removable core for cylinder lock, according to claim 8, characterized in that the continuous lower wall portion of the lower part of the lock core has a circumferential extension of approximately 180 °.

10. The removable core for cylinder lock, according to claim 9, characterized in that the continuous lower wall portion is inclined in relation to a transverse plane (D), which is perpendicular to a plane (A) through the row of tumblers immobilized in the solid part of the lock core, the recess engages the side bar which is located substantially at the same level as the rotational axis (C) of the rotatable key cylinder.