FR2674281A1 - SAFETY CYLINDER, IN PARTICULAR FOR FURNITURE LOCK. - Google Patents

Abstract

The safety cylinder, capable of being used as a furniture lock cylinder, comprises a key channel into which a key bit is inserted, the profile of which, formed on a reference plane of the key, acts on the locking pins . The separation surface 4 between the barrel 2 and the barrel 3 of the cylinder has a frustoconical shape and forms with the axis 9 of the cylinder an angle of inclination and alpha extraction. The key channel 5 guides the key bit so that the reference plane of the key profile extends parallel to the partition surface 4.

Description

1.

  SAFETY CYLINDER, IN PARTICULAR FOR FURNITURE LOCK

  The subject of the invention is a safety cylinder, capable of

  tible to be used as a furniture lock cylinder.

  Such safety cylinders have a key channel into which a key bit is introduced whose profile,

  placed on a reference plane of the key, acts on govern-

  locking pins each consisting of a pin of

  barrel and a barrel pin, so that they

  put a rotational movement of the barrel in the barrel, in the separation surface between the barrel and the barrel

safety cylinder.

  The costs of manufacturing the safety cylinders

  are still too high, given their use.

  This is due, among other things, to the necessary machining steps, which must be carried out from the casting of the barrel and the barrel until cylindrical precision barrels and barrels are obtained. The reduction in manufacturing costs of safety cylinders for furniture locks by simplifying the closure mechanism has drawbacks, mainly because the increasing use of safety cylinders in the field of furniture is due precisely to their

security.

  One of the aims of the invention is therefore, while preserving

  the security that can be achieved with a given number

  locking pins (number of iron combinations)

  to find a way to reduce manufacturing costs.

  cation of such reliable safety cylinders.

  This goal is achieved by providing that the separation surface

  ration between the barrel and the barrel of the safety cylinder

  has a frustoconical shape and, together with the axis of the cylinder,

  dre, angle of inclination and extraction (angle of

  puille au moulage) a and that the key channel of the cylinder guides the bit of the key so that it cuts

  longitudinal axis in the plane of the locking pins.

  the reference plane of the profile of the key extends

  parallel to the separation surface.

  The immediate advantage of the new safety cylinder lies in the fact that the machining times are considerably reduced for barrels and barrels, which are molded with a general angle of extraction or

  Thus, it is no longer necessary, as

  now in the manufacture of safety cylinders, to remove material to obtain a cylindrical shape of

barrel and cannon.

  It is also necessary to fully benefit from teaching

  in accordance with the invention, provide for compensation

  desired quotation of the separation surface between the barrel and the barrel, otherwise the realization of closure combinations that can be obtained in practice, for example with five locking pins would increase considerably In practice, the important thing is to be able to prefabricating the barrel pins actuated directly by the profile of the key, according to a number of given lengths, which in itself makes it possible to perform certain basic safety combinations, for example by placing a barrel pin of

  length determined in each of the five

  But if, as in the invention, the barrel of

  safety cylinder consists of a cone extending axially

  However, this realization of basic combinations by simple differentiated placement of barrel pins of determined length is excluded; if we do not realize the compensation

  according to the teaching of the invention.

  This compensation is obtained because of the fact that

  longitudinal axis in the plane of the locking pins-, the reference plane of the profile of the key is parallel to the

separation area.

  In practice, the invention is likely to

several embodiments.

  According to another embodiment, it is provided that in longitudinal axial section in the plane of the locking pins the parallel channel wall key channel is provided for a commercially available flat key, and

  that the axis of the canal forms with the axis of the cylinder the angle of

clinching and extraction a.

  According to yet another embodiment, it is expected that the axis of the channel is coaxial with the axis of the cylinder and that

  new longitudinal axial section in the plane of the govern-

  At least one of the latch pins adjacent to the locking pins forms with the cylinder axis the angle of inclination and extraction. Advantageously, in this embodiment, the channel comprises conical channels not only on one side but

  both, because the market prefers the so-called reverse keys.

  easier to use A reversible key for the proposed cone key channel is economically and practically feasible in the form of a flat key whose

  planar sides have a conical orientation, one

port to another.

  An exemplary embodiment of the invention is described below in more detail with reference to the drawing, in which

  FIG. 1 is a longitudinal section showing a cylinder

dre of safety according to the invention.

  It is shown in longitudinal section in a slightly simplified form, a cylinder 2 which is rotatably mounted in a barrel 3 of the cylinder The separation surface 4 between the barrel 2 and the housing constituted by the barrel 3 presents

the shape of a truncated cone.

  The key channel 5 is recognized in the barrel 2, which, in the exemplary embodiment, has, in the plane of the figure, two parallel channel walls 6 and 7.

  channel forms with the axis 9 of the cylinder an angle a

  vention, this angle is the same as the angle of inclination and extraction a (draft angle) which determines the taper

  barrel and barrel on the separation surface 4.

  In addition, five bores 10 made of

  known manner and intended to receive the locking pins

  rusting, each consisting of a barrel pin (not shown) disposed in the bore of the barrel and a barrel pin disposed in the barrel bore The left end and end barrel pins 11 on the right 12 are shown in the figure, to make it clear that, despite the taper of the barrel and barrel,

  the lengths of the barrel pins 11 and 12 are identical

  ticks and therefore both barrel pins can

  come from a single batch, prepared in advance, of govern-

barrel looters.

  Of course, the present invention is not limited to the embodiments described and shown but it is capable of numerous variants accessible to the man of

  art without departing from the spirit of the invention.

Claims (3)

  1. A safety cylinder, which can be used as a furniture lock cylinder, comprising a key channel in which a key bit is introduced whose profile, arranged on a reference plane of the key, acts on   locking pins each consisting of a gudgeon   barrel pin and a barrel pin, so that they allow a rotational movement of the barrel in the barrel, in the separation surface between the barrel and the barrel of the safety cylinder, characterized in that the surface of separation (4) has a frustoconical shape and makes with the axis (9) of the cylinder an angle of inclination and extraction a and in that the key channel (5) of the cylinder guides the key bit of such so that in-cut   longitudinal axis in the plane of the locking pins.   lage the reference plane of the profile of the key extends   parallel to the separation surface (4).   2. Safety cylinder according to claim 1, characterized   characterized in that in longitudinal axial section in the plane of the locking pins the key channel (5) with walls   parallel channel (6, 7) is provided for a reversing key.   commercially available plate, and in that the axis   (8) forms with the axis (9) of the cylinder the angle of clinching and extraction a.   3 Safety cylinder according to claim 1, characterized   characterized in that the axis (8) of the channel is coaxial with the axis of the cylinder and in that in longitudinal axial section in the plane of the locking pins at least the wall (6) of the key channel (5) adjacent to the locking pins (10) forms with the axis (9) of the cylinder the angle of inclination and extraction a.