DESCRIPTION

The present invention relates to a square driving pin of a lock of a door or window. The devices for opening and closing a door or window, as is known, usually have a lock with a deadbolt and/or latch control mechanism contained in a box recessed in the door or window, a handle and a square pin which connects the handle to the mechanism of the lock to transmit the rotation of the handle to a control cam of the mechanism.

To allow the correct operation of the lock, the square pin must be precisely and stably fixed in a hole of the control cam of the mechanism of the lock.

For the fixing of the square pin, one of its ends is provided with a rotatable fixing anchor for fixing to said hole and an oblique channel for inserting a driving screw of the fixing anchor.

After inserting the end of the square pin inside the hole, the installer inserts the screw by means of the use of a tool, such as a screwdriver or an Allen wrench.

In order to perform the fixing of the square pin it is necessary to create an access opening to the mechanism of the lock on the lateral surface of the door or window. This access opening is then covered by a cover plate applied before fixing the handle to the square pin.

Since the direction of introduction of the screw is inclined with respect to the axial direction of the square pin, this access opening must be fairly wide in order to perform the operation.

An access opening of this size requires an equally wide cover plate.

A lock of this type greatly limits design choices because, for example, a cover plate with a reduced size that would leave the access hole uncovered can never be installed.

The technical task addressed by the present invention is accordingly to realise a square driving pin of a lock of a door or window that enables the decried technical drawbacks of the prior art to be eliminated.

Within this technical task, one object of the invention is to realise a square driving pin of a lock of a door or window which is adaptable in a versatile manner for installation on doors or windows of various type.

Another object of the invention is to realise a square driving pin of a lock of a door or window that can be installed extremely easily, rapidly and precisely.

Another object of the invention is to realise a square driving pin of a lock of a door or window that guarantees the necessary fixing stability and a correct operation of the lock.

The technical task, as well as these and other objects, according to the present invention are achieved by realising a square driving pin of a lock of a door or window comprising a longitudinal body adapted to engage in a hole of a control cam of the mechanism of the lock and a fixing anchor for fixing said pin to said hole, said longitudinal body having at a first end a housing for said fixing anchor, said fixing anchor being rotatable between a release position of said hole in which it is retracted into said housing and a fixing position for fixing to said hole in which it is protracted from said housing, characterised in that it further comprises a driving rod of said fixing anchor positioned in an axial cavity of said longitudinal body.

Preferably, the rod has a thread engaged in a counter-thread of the axial cavity. Preferably, the rod has a head positioned outside a second end of said longitudinal body, said head having a mark for engaging a driving tool of the rod.

Advantageously, the axial cavity leads into the housing to engage the rod with the fixing anchor.

Preferably, the anchor has a first and a second coupling tooth on opposite sides of said hole.

In particular, the pin comprises a hinge axis for hinging the fixing anchor on the longitudinal body, the first and second coupling teeth are positioned opposite said hinge axis.

Preferably, said anchor has a gripping cam of the movement from said rod.

Preferably, the housing is formed by an axial slot of the longitudinal body that extends as far as said first end.

Preferably, the first and the second tooth interfere with stop walls provided in said longitudinal body to limit the rotation of said fixing anchor.

The invention finally discloses a lock which comprises a square pin corresponding to that which is described above.

Further characteristics and advantages of the present invention will more fully emerge from the description of the square driving pin of a lock of a door or window according to the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:

figure 1 shows an exploded perspective view of the square driving pin according to the present invention;

figure 2 shows an exploded perspective view of the square pin of figure 1 completely disassembled; figure 3 shows a perspective view of the square pin of figure 2 completely assembled;

figure 4 and figure 5 show a section view of the square driving pin according to the present invention;

figure 6 shows a detail of the pin of figure 1 after its installation in the square hole of a lock.

With reference to the figures cited, a square driving pin of a lock of a door or window is shown, indicated in its entirety by reference number 1.

The pin 1 comprises a longitudinal body 2 adapted to engage in a hole 3 of a control cam 30 of the mechanism of the lock 4, and a fixing anchor 5 for fixing to the hole 3.

In particular, a first end 6 of the longitudinal body 2 intended to engage in the hole 3 has a housing 7 for the fixing anchor 5.

The fixing anchor 5 is rotatable between a release position of the hole 3 in which it is retracted into the housing 7 and a fixing position for fixing to the hole 3 in which it is protracted from the housing 7. Advantageously, the pin 1 further comprises a driving rod 8 of the fixing anchor 5 positioned in an axial cavity 9 of the longitudinal body 2.

The driving rod 8 has a thread 10 which engages in a counter-thread 11 present in the axial cavity 9.

The rod 8 has a head 12 positioned outside a second end 13 of the longitudinal body 2.

The head 12 has a mark 26 for engaging a driving tool 14 of the rod 8.

The driving rod 8 can be for example, but not limited to, a screw having a head and a threaded stem.

Advantageously, the axial cavity 9 leads into the housing 7, realised in the first end 6 of the longitudinal body 2, for engaging the rod 8 with the fixing anchor 5.

The housing 7 is formed by an axial slot 27 of the longitudinal body 2 which extends from an intermediate position to the first end 6 of the longitudinal body 2. The slot 27 extends linearly through two opposite sides la, lb of the longitudinal body 2 and has a first end portion 24 on one side la and a second end portion 25 on the other side lb of the two opposite sides la, lb of the longitudinal body 2.

The two end portions 24, 25 are positioned at different axial distances from the first end 6 of the longitudinal body 2.

The fixing anchor 5 has a first 15 and a second 16 coupling tooth which are positioned on opposite sides 17, 18 of the hole 3.

The hinge axis 19 of the anchor 5 on the longitudinal body 2 is positioned transversely with respect to the axis of extension of the longitudinal body 2, in particular at the slot 27.

The first and the second coupling tooth 15, 16 are positioned opposite the hinge axis 19.

The first and the second coupling tooth 15, 16 interfere with a first stop wall 21 and a second stop wall 22 provided in the longitudinal body 2 that limit the rotation of the fixing anchor 5.

The fixing anchor 5 advantageously has a gripping cam 20 of the movement from the rod 8.

The method for installing the square pin 1 inside the hole 3 of the lock according to the present invention is described below. After inserting the first end 6 of the longitudinal body 2 in the hole 3, the installer screws the rod 8 which, advancing through the cavity 9 towards the first end 6 of the longitudinal body 2, goes to engage the cam 20.

The rod 8 thus engages the cam 20, as illustrated in figure 4 and 5, rotating the fixing anchor 5 from the initial release position to the fixing position to the hole 3. As is also seen in the figures, in the fixing position the anchor 5 is protracted from the housing 7 and its first 15 and second 16 coupling teeth engage the opposite sides 17, 18 of the hole 3.

In this configuration, the square pin 1 is stably fixed to the hole 3.

The fixing anchor 5 is never completely insertable into the housing 7 thanks to the presence of a first stop wall 21 of the longitudinal body 2 against which the first coupling tooth 15 abuts and a second stop wall 22 of the longitudinal body 2 against which the second coupling tooth 16 abuts.

The first wall 21 and the second wall 22 correspond to the end portions 24, 25 of the slot 27.

It must be noted that thanks to the provision of an axial housing for the control rod in the longitudinal body of the square pin, the access hole can have a smaller size because the installer operates in axis with the square pin.

Consequently, the cover plate of the access hole can be chosen with the maximum freedom, with the desired shape and size.

The square pin as conceived herein is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; furthermore, all the details are replaceable by technically equivalent elements.

In practice the materials used, as well as the size, can be any according to the needs and the state of the art.