FR2828227A1 - Lock with body that can be fixed through hole in sheet metal has fixing ring of synthetic material and deformable projecting rib - Google Patents

Abstract

The lock has a body (1) that can be fitted through a hole in sheet metal and receive a barrel (2) that turns a cam (3) when a key is inserted. It is fixed in place by a ring (4) of a synthetic and elastically deformable material with a projecting rib on its inner surface that engages with a shoulder on the lock body. The ring also has lugs on its inner surface that fit into cavities in the end of the lock body, and fingers (5) that extend axially from the lugs and fit against the surface of the sheet metal to fix the lock body in the hole, while a collar (1a) presses against the opposite surface.

Description

<Desc / Clms Page number 1>

The present invention relates to a lock composed of a body which can be fixed in a perforation of a sheet metal such as for example a front of a piece of furniture, a cover of box, etc., said body receiving a barrel journalled under the control of a key for actuating a cam.

In general, the lock body has, at one end, abutment means such as a protruding flange which, when the lock body is introduced into a sheet metal opening through the front face of the sheet, abuts against the periphery of the aperture while elements, for example projecting from the flange, cooperate with the periphery of the aperture to block the body in rotation in the aperture.

The fixing of the lock body can be carried out on the side of the rear face of the sheet with a fixing member such as a fork cooperating with two diametrically opposite grooves in the lock body or with a nut screwing onto a threaded area of the lock body.

<Desc / Clms Page number 2>

It has also been proposed to fix the lock body with the aid of a metal clip which is clipped by deformation to the lock body to fix the latter in the aperture. Metal clips have the disadvantage of not being easy to install, which increases the assembly time and, consequently, also the assembly cost.

Plastic locks have been proposed with an integrated clip. However, the body and the passage of glitter, in particular, do not allow sufficient retention of the barrel in the lock body. In addition, these all-plastic locks offer a low-end appearance.

Locks comprising a metal body and a plastic clip have also been proposed. The clip is mounted between the lock cam and the body so that the clip is not attached to the lock body but only interposed between the cam and the body. As a result, the forces for fixing the lock have a direct impact on the cam and the operation of the lock is thereby affected.

The object of the present invention is to overcome these drawbacks by proposing a lock composed of a body which can be fixed in an opening in a sheet metal such as, for example, a furniture front, a box cover, etc., said receiving body. a journal barrel for actuating a cam under the control of a key, said lock body being fixed in the aperture by means of a fixing member, characterized in that the fixing member consists of a ring made of elastically deformable synthetic material having, on its inner face, a projecting rib which, when the ring is engaged on the end of the lock body opposite to that comprising the key entry, is deformed and then positioned behind a shoulder formed on said end of the lock body, the ring further comprising

<Desc / Clms Page number 3>

 on its inner face projecting lugs which are housed in housings arranged in correspondence on the end of the lock body so that the ring is indexed in rotation on the lock body while the legs extending axially in the extension of the pins come into abutment against the sheet to axially lock the lock body in the aperture.

Thus, advantageously, the elastic deformation of the rib of the ring allows the positioning of said ring on the lock body and the retention of said ring on the lock body, the rib returning to its initial shape behind the shoulder. of the lock body, the tabs tightening the body in the aperture.

Thus, the fixing means constituted by the ring according to the invention is simple to implement and, therefore, of an advantageous cost.

The invention will now be described in more detail with reference to the accompanying drawing in which: FIG. 1 represents a side plan view of a lock according to the invention FIG. 2 represents a sectional view along line AA of the figure 1; Figure 3 shows a top plan view of the lock of Figure 1; Figure 4 shows a sectional view along line B-B of Figure 3; FIG. 5 represents a side perspective view of a lock according to the invention without the cam;

<Desc / Clms Page number 4>

 FIG. 6 represents an exploded perspective view of the lock of FIG. 5.

A lock according to the invention is composed of a body 1 which can be fixed in an opening in a sheet.

This body 1 receives a barrel 2 journalling to actuate a cam 3 under the control of a key, said body 1 of lock being fixed in the aperture using a fixing member.

The lock body 1 has at one end abutment means such as a projecting flange which, when the lock body 1 is introduced into a sheet metal cutout by the front face of the sheet, come into abutment against the periphery of the aperture while elements 1b, for example projecting from the flange la, cooperate with the periphery of the aperture produced in a complementary shape to block the body 1 in rotation in this aperture.

The lock body 1 is fixed in the aperture using a fixing member positioned behind the sheet.

This fixing member consists of a ring 4 of elastically deformable synthetic material provided with tabs 5 extending in axial projection. This ring 4 has at the base of the legs 5 projecting lugs 6 and has a rib 8 over its entire periphery which, when the ring 4 is forcibly engaged on the end of the lock body 1 opposite to that comprising the flange la, deforms and then positions itself behind a shoulder 7 formed on said end of the lock body 1, the pins 6 being housed in housings 9 provided for this purpose on the lock body to block the ring 4 rotating on the lock body 1.

Claims (2)

CLAIMS 1. Lock composed of a body (1) which can be fixed in a perforation of a sheet metal such as a furniture front, a box cover, said body (1) receiving a barrel (2) journalled to actuate a cam (3) under control of a key, said lock body (1) being fixed in the aperture using a fixing member, characterized in that the fixing member consists of a ring (4) in elastically deformable synthetic material having, on its inner face, a projecting rib (8) which, when the ring (4) is engaged on the end of the lock body (1) opposite to that comprising the key entry, deforms and is then positioned behind a shoulder (7) formed on said end of the lock body (1), the ring (4) further comprising on its inner face projecting lugs (6) which are housed in housings (9) formed in correspondence on the end of the lock body (1) of such a te that the ring (4) is indexed in rotation on the lock body (1) while legs (5) extending axially in the extension of the lugs (6) abut against the sheet to axially block the body of lock (1) in the aperture. 2. Lock according to claim 1, characterized in that the lock body (1) has at one end abutment means such as a protruding flange (la) which, when the lock body (1) is introduced into a sheet metal aperture by the front face of the sheet, abuts against the periphery of the aperture while elements (1b) projecting from the flange (la), cooperate with the periphery of the aperture produced in a complementary shape to block the body (1) in rotation in this opening.