Safety Device

Abstract

The present invention relates to a safety device for locks including a casing with a system for entering an opening code, a cylinder for activating the lock, and a dial, fixed to the casing with capacity of rotation, and firmly attached to a tab which blocks opening based on the position in which it is located by means of a connecting part and the cylinder, the tab being firmly fixed to the cylinder. The dial includes a drive bushing firmly fixed to the cylinder by means of a connecting part, and a cover bushing including a flange, for fixing to the inside of the casing, and a gripping area projecting from the casing to activate the tab, wherein the cover bushing is fixed to the drive bushing by pressure.

Claims

1. A safety device for locks comprising a casing which incorporates a system for entering an opening code, a cylinder for activating the lock, and a dial, fixed to the casing with capacity of rotation, and firmly attached to a tab which blocks opening based on the position in which it is located by means of a connecting part and the cylinder, the tab being firmly fixed to the cylinder, wherein the dial of the safety device comprises: a drive bushing firmly fixed to the cylinder by means of a connecting part, and a cover bushing comprising a flange, for fixing to the inside of the casing, and a gripping area projecting from the casing to activate the tab, wherein the cover bushing is fixed to the drive bushing by pressure.

2. The safety device of claim 1 wherein the drive bushing is configured by means of a ring which incorporates an extension intended to be fitted into a recess of the connecting part such that the rotation of the two parts is simultaneous.

3. The safety device of claim 1 wherein in that the cover bushing has a hollow cylindrical configuration, wherein the gripping area has discontinuities to facilitate gripping and the flange is an edge on one of the bases with a larger diameter and a specific height.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0016] The terms FIG., FIGS., Figure, and Figures are used interchangeably in the specification to refer to the corresponding figures in the drawings.

[0017] To complete the description of the invention, and for the purpose of helping to make the features thereof more readily understandable, according to a preferred exemplary embodiment thereof, a set of drawings is included wherein, by way of illustration and not limitation, the following figures have been represented:

[0018] FIG. 1 depicts a top front perspective view of the safety device of the invention installed in a lock.

[0019] FIG. 2 depicts a front view of the safety device of the invention installed in a lock.

[0020] FIG. 3 depicts a side view according to the section marked in FIG. 2.

[0021] FIG. 4 depicts an exploded perspective view of the main elements forming the lock with the safety device of the invention.

[0022] FIGS. 5A and 5B depict rear and front perspective views, respectively, of the dial assembled in a connecting part.

[0023] A list of the references used in the figures is provided below: [0024] 1. Lock. [0025] 2. Drive bushing. [0026] 3. Cover bushing. [0027] 4. Connecting part. [0028] 5. Cylinder. [0029] 6. Casing. [0030] 7. Tab. [0031] 8. Shaft. [0032] 9. Extension. [0033] 10. Ring. [0034] 11. Flange. [0035] 12. Gripping area. [0036] 13. Recess. [0037] 14. Stop. [0038] 15 Projections.

DESCRIPTION OF THE INVENTION

[0039] The object of the present description consists of a safety device the configuration and design of which protect the lock (1) where it is installed against acts of vandalism of tampering.

[0040] To prevent the aforementioned problems, the dial of the conventional lock described above has been modified, being configured by two parts: a drive bushing (2) and a cover bushing (3) which is what the user will see and use like a knob to open the lock (1) upon rotating it.

[0041] The drive bushing (2) is a part which is coupled to the cylinder (5) of the lock (1) by means of a connecting part (4) and which is also attached to the tab (7) for blocking the lock (1). The tab (7) blocks the opening of the lock by interfering with the structure of the cabinet or locker to be closed.

[0042] Once the correct opening code has been entered in the lock (1), the dial is activated by means of a rotation of the cover bushing (3) and the drive bushing (2) transfers the rotational movement to the tab (7) which, when rotated, releases the interference and allows opening the door where the lock (1) is located.

[0043] The cover bushing (3) is a part which is installed by pressure on the drive bushing (2). In this way, upon rotating the cover bushing (3), the drive bushing (2) is also rotated.

[0044] In the event of an attempt to tamper with the lock (1), exerting an excessive force on the cover bushing (3) to rotate it will cause the cover bushing to slide over the drive bushing (2), protecting the lock (1) and preventing the unauthorized opening thereof.

[0045] The device, as well as its operation, will be described in more detail below.

[0046] FIG. 1 depicts a lock (1) viewed from the front or external area of the space to be closed, with the safety device of the invention incorporated. The lock (1) can be opened by means of a combination or also by means of a key which, once access is authorized, allows rotating the cover bushing (3) in order to rotate the blocking tab (7), to release the interference, and to enable opening the door where the lock is located.

[0047] FIG. 2 depicts a front view of the lock of FIG. 1 in which a section line is shown.

[0048] FIG. 3 depicts a sectional side view of the lock depicted in FIG. 2 according to the section line.

[0049] It can be seen in this figure how all the main components of the lock are coupled with the protective device of the invention. In that sense, the tab (7) is firmly attached to a hollow shaft (8) where an element for attaching to the cylinder (5) of the lock (1) is housed. It can also be seen that the cover bushing (3) incorporates a flange (11) and a gripping area (12). The flange (11) abuts with the casing (6), preventing the possibility of removing the dial from the outside by pulling on the gripping area (12) of the cover bushing (3) emerging outwardly.

[0050] It can also be seen in FIG. 3 how the cover bushing (3) is coupled to the drive bushing (2) simply by pressure, without any retaining element. In turn, the drive bushing (2) is coupled to a connecting part (4) firmly coupled to the cylinder (5). In this way, the cover bushing (3) is directly connected to the tab (7) such that, with the tab (7) having freedom of movement, a rotation of the cover bushing (3) means a rotation of the tab (7).

[0051] FIG. 4 depicts an exploded view of the lock (1) in which the position of the components depicted in FIG. 3 before being coupled can be seen.

[0052] In particular, it can be seen that the drive bushing (2) is formed by a ring (10) which incorporates an extension (9).

[0053] On the other hand, the connecting part (4) incorporates projections (15), a stop (14), and a recess (13).

[0054] To couple the drive bushing (2) in the connecting part (4), the projections (15) are inserted into the ring (10) until contacting the stop (14). The drive bushing (2) must be positioned radially so that the extension (9) fits into the recess (13) of the connecting part (4), such that the rotation of one part can be transmitted to another part.

[0055] The attachment of these two parts (2, 4) can be seen more clearly in FIGS. 5A and 5B.

[0056] Lastly, it must be taken into account that the present invention must not be limited by the embodiment described herein. Other configurations may be carried out by those skilled in the art based on the present description. Accordingly, the scope of the invention is defined by the following claims.