FR2787489A1 - Lock with plastic body for clipping into support opening has radial cavity with inwards directed lug - Google Patents

Abstract

Lock (1) has cylindrical plastic body (2) clipped into circular opening (6) in support (5). Body has front flange supported against external edge of opening. Opening has radial cavity (7) and inwards directed lug (8). Body is fitted with locking pair with resilient locking tongue (11) and stop (12) projecting radially outwards. In installed position, resilient tongue is housed in radial cavity.

Description

1) Lock with plastic body clipable into an opening of a support La

  present invention relates to a lock with a plastic body

  clip into an opening of a support.

  2 () Locks of this type have the advantage of quick assembly but often have the disadvantage of clipping

insufficiently reliable.

  The present invention aims to ensure secure fixing of a lock of the type in question without increasing its cost price. To this end, the subject of the present invention is a lock with a cylindrical plastic body arranged to be clipped into a circular opening of slightly larger diameter made in a support, said body having a front flange in abutment around the outer edge of said opening. in the mounting position, characterized in that said circular opening of the support comprises at least one radial recess and at least one lug directed inwards, said recesses and said lugs being angularly spaced apart in pairs, said body of the lock being equipped with '' at least one locking torque each comprising an elastic locking tab and a stop projecting radially outwards, the circumferential dimension of the legs and stops allowing their accommodation in a radial recess of the opening of the support, the circumferential distance between the edges spaced from each other by a tab and a torque stop corresponding to the circumferential distance in a couple, between the edge of the tab separated from the stop and the face of the stop turned towards the tab, the angle between the recess-lug pairs of the opening and the pairs of elastic tabs-stops of the lock body being equal, the arrangement being such that, in the mounting position, the elastic tabs of the body are each housed in a radial recess in the opening of the support. The lock according to the invention provides, in the mounting position, high security in rotation by the housing of the elastic tabs each in a recess and by the support of each stop against a lug of the support. Safety in the insertion is ensured by the support of the flange on the support around the opening while the safety in the removal results from the support of the stops on the inner face of the

support.

  The invention will be clearly understood on the following reading of an exemplary embodiment, with reference to the appended drawing in which: FIG. 1 is a schematic perspective view of the lock mounted on a support, the assembly being seen from the inside, FIG. 2 is a plan view of the opening in the support, seen from the inside, FIG. 3 is a sectional view along line III-II of FIG. 2, the lock being mounted and FIG. 4 is a sectional view along line IV-IV of Figure 2, without the lock. The lock 1 comprises a cylindrical body 2 made of plastic material in which the rotor 3 carries a cam

interlock thresher 4.

  I (The support 5 has a circular opening 6 whose diameter is slightly greater than that of the body 2 housed therein. According to the invention, the circular opening 6 of the support 5 has two radial recesses 7, 7 ′ trapezoidal and diametrically opposite in the example shown, as well as two lugs 8, 8 ′ turned inwards and also diametrically opposite, angularly offset with respect to

2) the associated recess 7, 7 ′.

  The body 2 of the lock 1 is provided with a flange 9 forming a shoulder 10 for external support around the circular opening 6 of the support 5, on the front face 5 '

of it.

  The body 2 further comprises two elastic tabs 11, 11 'in radial projection suitable for being each engaged in a recess 7, 7' respectively, as well as two stops 12, 12 '3) in axial projection on the rear or interior face 5 "of the support 5. The legs 11, 11 'and the stops 12, 12' form two pairs, diametrically opposite, having the

following features.

  The stops 12, 12 'can each be housed in one of the recesses 7, 7' and the circumferential distance between the edge of a tab 11, 11 'separated from the associated stop 12, 12' and the edge of the stop 12, 12 'apart from the tab 11, 11' associated corresponds, apart from the mounting clearances, to the circumferential distance between the edge of a recess 7, 7 'separated from the lug 8, 8' associated and the face of the lug 8, 8 'turned

towards the associated tab 11, 11 ′.

  These characteristics allow the mounting of lock 1

as following.

  I0 We bring the body 2 of the lock on the front face 5 'of the

  support 5, opposite the opening 6 and in the axis thereof

  ci, the stops 12, 12 'being aligned with the recesses 7, 7'. Lock 2, thus oriented in the direction A-A

(figure 2).

  The lock 1 is pushed axially into the circular opening 6. The stops 12, 12 'slide in the recesses 7, 7' respectively and the elastic tabs 11, 11 'are pushed towards the inside of the body 2 by the edge of) the opening 6. When the flange 9 of the body 2 of the lock 1 abuts against the outer face 5 ′ of the support 5, it suffices to rotate the lock anti-clockwise (in FIG. 2 ) until the stops 12, 12 'come to bear on the lugs 8, 8' respectively, the tabs 11, 11 'then being respectively opposite the recesses 7, 7' in which they come to snap. To ensure a unique mounting position of the lock, it is 3) possible to associate it, in a manner known per se, with a keying system. According to an extremely simple embodiment, this keying system is obtained by the fact that the lock has two tabs 11, 11 '- pins 12, 12' of different widths cooperating with two

  recesses 7, 7 'of the support of corresponding widths.

Claims (4)

  1. Lock (1) with cylindrical body (2) of plastic material arranged to be clipped into a circular opening (6) of slightly larger diameter formed in a support (5), said body (2) having a front flange (9) resting around the outer edge of said opening (6) in the mounting position, characterized in that said circular opening (6) of the support (5) comprises at least one radial recess (7, 7 ') and at least one lug ( 8, 8 ') directed inwards, said recesses (7, 7') and said lugs (8, 8 ') being angularly spaced apart in pairs, said body (2) of the lock (1) being equipped with minus a locking torque comprising an elastic locking tab (11, 11 ') and a stop (12, 12') projecting radially outwards, the circumferential dimension of the legs (11, 11 ') and stops (12 , 12 ') allowing their accommodation in a radial recess (7, 7') of the opening (6) of the support (5), the distance circ reference between the edges spaced from each other of a tab (11, 11 ') and of a stop (12, 12') of a pair (11, 12; 11 ', 12') corresponding to the circumferential distance in a pair (11, 12; 11 ', 12'), between the edge of the tab (11, 11 ') spaced from the stop (12, 12') and the face of the stop (12, 12 ') turned towards the tab (11, 11'), the angle between the pairs of recesses (7, 7 ') - pins (8, 8') of the opening (6) and the pairs of elastic tabs (11, 11 ') - stops (12, 12') of the lock body (2) being equal, the arrangement being such that, in the mounting position, the elastic tabs (11, 11 ') of the body (2) are each housed in a radial recess (7, 7 ') of the opening (6) of the support (5).   2. Lock according to claim 1, characterized in that the support comprises two couples   recesses (7, 7 ') - diametrically opposed lugs (8, 8').   3. Lock according to one of claims 1 and 2,   characterized in that it comprises a threshing cam (4).   4. Lock according to one of claims 1 to 3,   characterized in that the lock has two tabs (11, 11 ') - pins (12, 12') of different widths cooperating with two recesses (7, 7 ') of the support of corresponding widths.