ES2397153B1 - Inner protector for lock cylinders - Google Patents

Abstract

Inner protector (21) for lock cylinders (20) of which have their front part of the outer side of the door with, sometimes, an outer shield (32), and a rear part of the inner side of the door, in the that the inner protector (21) is a hollow body that completely surrounds the cylinder (20) with its inner part being the silhouette corresponding to the contour of the cylinder (20) being operatively located in front of the rotary cam (30), and which has at least a blind channel (22) of the rear side arranged longitudinally to the cylinder (20), which acts in conjunction with at least one corresponding protuberance (23), existing on the lower side of the cylinder (20).

Description

INTERIOR PROTECTOR FOR LOCK CYLINDERS OF THE INVENTION FIELD

This invention concerns a device for providing security against attempts to violate by aggressive methods the cylinder of a lock that employs sets of pythons to establish the opening key.

In general, the methods of violation of lock cylinders are intended to cancel in some way, destructive or not, the opening key established by the pythons, and thus act on the rotary cam that drives the mechanism of the lock until its opening, or also act on the fastening drilling of the lock cylinder, specifically through the buckling attack in which a pliers type tool is introduced to make continuous movements from left to right.

STATE OF THE PREVIOUS TECHNIQUE

Due to geometric and functional limitations, the cylinders of the so-called "pear profile" or "European profile" have a weak central area, since they combine the removal of material from the block body of the lock cylinder, necessary to accommodate the cam Rotary which will then act on the lock, and a drilling (at least 5mm in diameter) to accommodate the screw that will finally fix the lock cylinder to the door.

The resistant section of material that finally results is very weak against the vandalism consisting of gripping the cylinder by the front with a pliers-like tool and exerting a force from right to left until the lock cylinder breaks through said central part.

As security elements against this vandalism action are the structural reinforcing bars. The solution of the structural steel bar in principle is logical and simple since it simply replaces the material of the weak zone that passes from brass to steel, multiplying by three the torsional strength of this zone. The drawback presented by this solution is that the weak zone is now transferred to the fastening system applied to support this structural bar to the rotor: the system applied consists of the fixation by transverse pins between bar and rotor, but ultimately, these pins return to be embedded in a brass section, so the junction is again a weak zone.

EXPLANATION OF THE INVENTION AND ADVANTAGES

Faced with this state of affairs, the invention that concerns us now advocates an inner protector for lock cylinders that have their front part of the outer side of the door with, sometimes, an outer shield, and a rear part of the inner side of the door, characterized in that it is a hollow body that completely surrounds the cylinder, its internal part being the silhouette corresponding to the contour of the cylinder being operatively located in front of the rotary cam, and which has at least one blind channel of the rear side arranged longitudinally to the cylinder , which acts in conjunction with at least one corresponding protuberance, existing on the lower side of the cylinder.

This configuration allows the inner protector to be located at the front of the weak central area where the rotary cam and the clamping hole are located, completely surrounding the contour of the cylinder in this area. By means of the blind channel that is arranged longitudinally in the inner protector with respect to the cylinder, the housing of the protuberance is achieved by determining the correct position of the inner protector on the cylinder. In this way, a considerable increase in high hardness material and a blockage in the passage of any destructive tool are provided in the conflict zone of the cylinder. By means of this over thickness, the professional thief can prevent access to the clamping of the cylinder or the rotating cam on the outside with a grip tool of the pliers type to exert a force from right to left until it is broken by said part central.

In this same line, another feature of the invention is that said protuberance is an insert with a body that resembles a mushroom and a stem, housed in a blind hole of the cylinder, so that its incorporation and manufacturing is simple and economical.

This protuberance is inserted in a blind hole by means of pressure in front of the weak central zone of the cylinder, at the optimum point to act on the blind channel and thus fully fix the inner protector on the cylinder which prevents the extraction from outside the shield of internal protection by invaders. Thus, the inner protector is completely fixed in the front part of the weak central zone, which is where the rotary cam and the clamping hole are housed. The outgoing arrangement of the lock mechanism prevents the inner guard from moving towards the rear. In addition, the mushroom shape of the protuberance allows it to be housed in the cylinder without

perform

a drilling deep but guaranteeing the

immobility of it.

DRAWINGS and REFERENCES

For

better understand the nature of invention, in the

The accompanying drawings represent an industrial embodiment that is merely illustrative and not limiting.

Figure 1 shows an exploded perspective of the invention, that is, the inner protector (21) outside the cylinder (20), and with an arrow indicating the insertion maneuver therein for assembly. It is also observed by an arrow of the insertion of the protuberance (23) that resembles a mushroom (24) and a stem (25) in the blind hole (27) made in the cylinder (20).

Figure 2 is a perspective of the inner protector (21) installed in the cylinder (20), but not in its final position.

Figure 3 is a section of a side view of the frame of a door and as it is finally the inner protector (21) located in the cylinder (20).

Figure 4 is a plan representation of the inner protector (21).

Figure 5 shows a section of the cylinder (20) where the bolt (26) and the through hole (28) are located.

The following references are indicated in these figures:

20.-Cylinder.

21.-Interior protector.

22.-Blind channel.

23.-Protuberance.

24.-Mushroom

25.-Stem.

26.-Bolt.

27.-Blind hole.

28.-Through hole.

29.-Lock mechanism.

30.-Rotary cam.

31.-Clamping drilling.

32.-Outer shield.

EXHIBITION OF A PREFERRED EMBODIMENT

With regard to the drawings and references listed above, a preferred embodiment of the object of the invention is illustrated in the attached drawings, referring to an inner protector (21) for lock cylinders (20) of which have their front part of the outer side of the door with, sometimes, an outer shield (32), and a rear part of the inner side of the door. As illustrated in Figures 1, 2 and 3, this invention has the peculiarity that it is a hollow body that completely surrounds the cylinder (20), its inner part being the silhouette corresponding to the contour of the cylinder (20) being operatively placed in front of it. of the rotary cam (30), and having at least one blind channel (22) of the rear side longitudinally disposed to the lock cylinder (20), which acts in conjunction with at least one corresponding protuberance (23), existing in the lower side of the cylinder (20).

This configuration allows the inner protector (21) to be located in the front of the weak central zone, completely enveloping the contour of the cylinder (20), since by the longitudinal arrangement of the blind channel (22) with respect to the cylinder (20), the extrusion housing is achieved

(2. 3)

determining the proper position of the inner protector (21), that is, in front of the rotary cam (30) and the clamping hole (31). This contributes to the weak zone of the cylinder

(twenty)

a considerable increase of resistant material and the blocking of the passage to any type of invasive tool is guaranteed. By means of this over thickness it is prevented that the thief can attack the cylinder (20) on the outside with a tool of the pliers type to exert a buckling force until it breaks through said central part, and attack the rotary cam (30 ) to rotate and activate the lock mechanism (29).

In addition, the internal protector (21) advocated is compatible in its use together with the outer shield (32), but its use is indicated in those cases that it is necessary to protect the cylinder (20) against vandalism and the configuration of the cylinder assembly (20) on the door they make the outer shield (32) impossible or difficult to install, such as in cases where they reinstall handle plates.

According to the invention, it can be seen in Figure 1, that the inner protector (21) for lock cylinders (20) is characterized in that said protuberance (23) is an insert with a body that resembles a mushroom (24) Y a stem (25), housed in a blind hole (27) of the cylinder (20). This mushroom-shaped protuberance (23) is inserted in a blind hole (27) in front of the weak central area of the lock cylinder (20), at the appropriate point to act on the blind channel (22) and thus secure the protector inside (21) on the cylinder (20), at the optimum point, that is, as a shield of the rotary cam (30) and of the clamping hole (31). Thanks to the blind channel (22), it is avoided that the inner protector (21) can be removed from outside the building, since the perpendicular wall of the blind channel (22) will exert such removal. On the other hand the outgoing provision of the

lock mechanism (29) prevents the inner protector (21) from moving towards the rear. As clearly illustrated in Figure 4, the inner protector (21) for lock cylinders (20) is differentiated

5 because there are two blind channels (22) capable of accommodating two corresponding protuberances (23) in the lock cylinder (20).

As can be seen in Figure 5, the inner protector

(21) for lock cylinders (20) is characterized in that

10 said protuberance (23) is provided to be a bolt (26) of sufficient length, housed in a through hole (28) that crosses the cylinder body (20) and is retained by pressure difference in diameters between buIon (26) and through hole (28), or by riveting the cylinder material (20) surrounding the

15 through hole (28) where said bolt (26) is housed.

The function of the bolt (26) is not only to retain the inner protector (21) in an attempt to remove it to the outside, but it behaves as an element that adds difficulty to the grip of the cylinder (20) with the vandal tool in those

20 installations where the door housing arranged to accommodate the cylinder (20) is not of sufficient size to house the inner protector (21).

Claims (1)

1 ".- Inner protector (21) for lock cylinders (20) of which have their front part of the outer side of the door with, sometimes, an outer shield (32), and a rear part of the side 5 inside the door, characterized in that it is a hollow body that completely surrounds the cylinder (20) with its inner part being the silhouette corresponding to the contour of the cylinder (20) being operatively located in front of the rotary cam (30), and having the minus a blind channel (22) on the rear side arranged 10 longitudinally to the cylinder (20), which acts in conjunction with at least one protuberance (23) which is an insert with a body that resembles a mushroom (24) and a stem (25), housed in a blind hole (27) existing on the lower side of the cylinder (20). 2 "._ Inner protector (21) for lock cylinders (20), 15 according to the first claim, characterized in that said protuberance (23) is provided to be a buIon (26) of sufficient length, housed in a through hole (28) that crosses the cylinder body (20) and is retained by pressure difference of diameters between bolt (26) and through hole (28). 20 3 "._ Inner protector (21) for lock cylinders (20), according to any of the preceding claims, characterized in that there are two blind channels (22) capable of accommodating two corresponding protrusions (23) in the cylinder (20) of lock.