FR3039448A1 - MAGNETIC SCREW SLEEVE. - Google Patents

Abstract

The invention relates to a sleeve (10) for screwing a screw (11), comprising: - a body (13) extending longitudinally along an axis (X10) provided, in a front portion (31), with a face bearing (36); - A bit holder (14) for rotating a screw bit (16), integral in axial rotation of the body; and magnets (44), arranged around the axis (X10), designed to hold the head of the screw (11) in abutment against the bearing face.

Description

The present invention relates to a device for implementing screws, in particular for fixing and assembling wooden elements using long screws.

To fix such elements, the operator moves upright, and uses a screwdriver. This screwdriver includes a magnetic tip on which is placed the screw which is thus maintained, avoiding the operator to bend to position and maintain the each screw posed.

However, the screws used are often of great length, when they are intended for the assembly of thick wood purlins or for sarking, that is to say to bind a counter-batten on a chevron. Now, the magnetization of the screwdriver tip is not sufficient to hold the screw securely; many screws fall, which forces the operator to stoop often which is very tiring and significantly reduces the yield.

There are no satisfactory means suitable for laying large screws. The object of the invention is to propose means to make it possible to guarantee the good behavior of such a screw during the positioning and screwing operation; these means must, however, allow easy grip of the screw by the screwdriver and their separation without significant effort at the end of screwing.

To achieve its purpose, the invention proposes a socket for screwing a screw, comprising: a body extending longitudinally along an axis, this body being provided, in an anterior portion, with a bearing face; means for rotating a screwdriver tip about the axis; - Means for securing in axial rotation the body with the drive means; and - means for holding a screw head in abutment against the bearing face; characterized in that the holding means comprise at least one magnet disposed longitudinally at the rear of the bearing face, preferably several magnets, preferably five, arranged regularly around the axis, their foremost poles being all the same polarity.

The drive means are advantageously movable longitudinally in the body and the sleeve comprises means for limiting their longitudinal movement in the body.

The drive means may comprise a bit holder, the body comprising a housing for housing therein, disposed at the rear of its front portion, the body further comprising an axial hose between said housing and the bearing face. , for the passage of the mouthpiece.

Several embodiments of the invention will be described below, by way of non-limiting examples, with reference to the accompanying drawings in which: - Figure 1 is an elevational view of a socket according to a first embodiment of the invention and a screw that it carries; - Figure 2 is an elevational view in axial section, the sleeve of Figure 1, a double scale; FIG. 3 is an exploded perspective view of the socket of FIG. 1; FIG. 4 is an exploded and perspective view according to a second embodiment of the invention; - Figure 5 is an axial sectional view of the body of the sleeve of Figure 4; and, - Figure 6 is an axial sectional view of a protective cover adaptable to the bushings of Figures 1 and 4.

Figures 1 to 4 illustrate a socket 10 according to the first embodiment of the invention. In Figures 1 and 2, a screw 11 is removably attached to an anterior end of the sleeve 10. Arbitrarily, is called anterior and posterior, which is respectively close to the screw or remote from the screw, as shown in FIG. In this position, the sleeve is substantially of revolution about an axis X10, and the screw 11 is substantially aligned with the sleeve, along the axis XI0.

Such a socket mainly comprises: a body 13; a bit holder 14; a ring 15; and, a tip 16.

The bit holder 14 comprises from front to back: a driving head 21 comprising a hollow impression intended to come into rotary engagement with the posterior end of the endpiece 16; a cylindrical central portion 22 of smaller diameter than that of the head; a receptacle 23 of polygonal cross-section intended to engage with the mandrel of a screwdriver.

The transverse dimensions of the socket 23 are smaller than the diameter of the central portion, a rear shoulder 24 thus being formed between the central portion 22 and the socket 23. A central shoulder 29 is thus formed between the central portion 22 and the head of training 21.

The ring is fitted around the central portion 22 of the bit holder. It comprises an annular bottom 25, pierced axially to allow the plug 23 to pass, mounted to bear against the shoulder 24. The ring 15 is mounted integral with the bit holder 14. In the example shown, the ring is secured by means of a needle screw 26 screwed into a thread through a wall of the ring, so that the needle screw 26 protrudes radially outwards when it is screwed fully against the central portion 22 of the bit holder; the needle screw 26 thus forms a lug 27.

The body 13 essentially comprises, from front to rear: an anterior portion 31; a central portion 32; and, a posterior portion 33.

The anterior portion 31 houses means 34 for holding the head of the screw 11 to be placed against a bearing face 36 of the body 13. The face 36 is disposed in front of the anterior portion and perpendicular to the axis XI0, so that the support of the head of the screw against this face allows to position the screw so that it extends substantially parallel to this axis.

The central portion 32 and the rear portion 33 are hollow cylinders respectively forming a central cylindrical housing 37 and a rear cylindrical housing 38. The central cylindrical housing 37 houses the drive head 21 of the bit holder. It has a diameter smaller than the diameter of the posterior housing 38, so that they form between them a shoulder 39.

The rear housing 38 forms with the ring 15 a sliding bearing. It is open at the rear, so as to allow the introduction, axially and from the rear, of the bit holder and the ring. An opening 41, longitudinally oblong, is formed in a wall of the rear housing 33. It allows the passage of the needle screw, to screw it into the wall of the ring into the central portion 22 of the bit holder. In addition, the opening 41 and the lug 27 together form: a guide in axial translation for the bit holder 14 relative to the body 13; and - a rotary drive for the body 13 by the bit holder 14.

Thus, the bit holder 14 can move axially relative to the body 13, within the limits imposed by the length of the oblong opening 41, while being integral in rotation. Thus, the whole of the sleeve 10 rotates integrally with bit holder, at the same speed as the mandrel of the screwdriver.

The anterior portion 31 comprises an axial hose 43, cylindrical, allowing the passage of the tip 16, from the central housing 37 to the front face. The dimensions of the sleeve 10 are such that when the lug 27 abuts the rear of the opening 41, the tip still protrudes forward of the bearing face, so as to remain engaged with the cavity 42 hollow, the head of the screw 11. The possibility of axial translation of the bit holder, and therefore the endpiece that is engaged, allows to adapt to different depths of impression 42; the tip can be advanced to take advantage of a large depth of impression, or back to adapt to a shallower depth, within the limits imposed by the longitudinal dimension of the opening 42, while ensuring a contact head of the screw 11 with the bearing face 36. The tip 16 is not necessarily part of the sleeve according to the invention. In the illustrated example, it is interchangeable; it is chosen as a function of the dimensions and the cross section of the imprint 42 of wash 11.

In the first embodiment, the means for holding the screw against the bearing face comprise magnets 44. In the example illustrated, the magnets 44 are five in number, cylindrical and identical to each other. The magnets are each arranged in a respective cylindrical housing 45, extending longitudinally in the anterior portion 31 of the body 13. The five housings 45 are evenly distributed around the hose 43.

Each magnet is arranged longitudinally, that is to say that one of the poles of the magnet is at the front and the other at the rear. The front poles of the set of magnets are all the same polarities, the rear poles being of opposite polarity. The magnets are mounted substantially flush with the bearing face 36, so that they together with the support surface constitute the same bearing surface for the head of the screw 11.

A peripheral groove 46 is formed at the rear of the anterior portion, so that it forms with the rear end of each housing 45, at their intersection, a vent 47. Thus, when introducing a magnet 44 in its respective housing 45, the air is expelled from the housing through the respective vent 47. Both pressed against the bearing surface 36 by the action of the magnets 44 and centered on the tip 16, the screw 11 is held substantially coaxially with the axis X10.

The socket further comprises a protective cover 51. The cover 51 comprises a split cylinder 52 and an annular rim 53. It further comprises, near the rear end of the cylinder 52, an annular bead 56 extending radially from an inner face of this cylinder. The annular flange 53 extends radially towards the axis XI0 from a front end of the split cylinder 52.

The split cylinder 52 is split by slots 54 which extend longitudinally from the rear end of the cylinder, open at the rear, closed at the front. They give flexibility to the cylinder 52, so that when the cover 51 is introduced from the front onto the anterior portion 31 of the body 13, the end of the split cylinder 52 elastically spreads to allow the passage of the bead 56 around of the anterior portion. The annular rim 53 and the bead 56 are arranged so that when the rim abuts against the bearing face 36, the bead snaps into the annular groove 46. The cover 51 is thus held pressed against the face of the rim. support by the taking of the bead 56 with the groove 46. In addition, the annular flange 53 is dimensioned to protrude radially to the front of each housing 43. Thus, the rim prevents a magnet can escape its housing, under the action of vibrations and shocks due to the use of the socket.

A window 58 is also provided in the cylindrical wall of the central housing 27. A tool, for example a screwdriver, can be introduced through this window to exert pressure or impact against the central shoulder 29; thus, one can advance the bit holder 14 to disengage the screw 11 of the holding means 34, if necessary.

We will now describe a second embodiment for a socket according to the invention, with reference to Figures 4 to 6, in that it differs from the embodiment of Figures 1 to 3. In the figures, similar elements have the same reference numbers in both embodiments.

This embodiment is particularly suitable for the installation of stainless steel screws, generally non-magnetizable. Thus, this embodiment differs essentially by the holding means 34 employed. These holding means are disposed at the front of the bearing face 36 so that the bearing face is recessed, at the rear of a front face 61 of the body 13. Thus, the bearing face 36 forms the annular bottom of a front housing 62 open in the front face 61, and adapted to receive the head of the screw 11 to be installed.

An anterior peripheral groove 63, open radially outwardly of the body, is provided in the peripheral wall of the front housing 62. Several cups 66 are provided in the bottom of the groove 63, so that they open radially into the front housing. 62, through an orifice 67. The maximum diameter of each cuvette is substantially equal to the width of the groove 63. The diameter of the orifice 67 is smaller than that of the bowl, so that a peripheral edge 38 is preserved around of the orifice.

In the illustrated example, the cuvettes are three in number, evenly distributed around the axis X10.

In this second embodiment, the means 34 for holding the head of the screw 11 against the bearing face comprise: - the anterior groove 63, and the three cuvettes 66; three balls 69, each housed in a respective bowl; and, an elastic ring 70.

The relative diameters of each ball and the orifice 67 are such that the ball can rest on the peripheral edge while protruding inside the front housing 62. The elastic ring is disposed in the anterior groove so that tends to repel the balls radially, towards the axis X10, until they rest on the edge 68 of the orifices 67.

The diameter of the front housing is substantially equal to that of the head of the screw 11. Thus, when the screw head is introduced into this housing 62, it pushes the balls radially in the groove 63. When the widest part of the screw is passed in front of the balls, they are elastically pushed radially towards the axis X10, under the head of the screw, so that the latter is kept pressed against the bearing face 36.

In the second embodiment, the cover 51 does not include slots. It is made of plastic material, so that the cylinder 52 can deform during its implementation, without having to be split.

A socket 10 according to this second embodiment is generally adapted to a screw head of specific dimensions, while a socket according to the first embodiment is more versatile.

In the first embodiment, the body is made of aluminum and the ring is made of brass. In the second embodiment, the body and the ring are made of plastic.

Of course, the invention is not limited to the preferred embodiments which have just been described but, on the contrary, the invention is defined by the following claims.

It will be apparent to those skilled in the art that various modifications can be made to the embodiments described above, in the light of the teaching that has just been disclosed.

Thus, in the illustrated examples, the bit holder is a type of trade, reference 894/4/1 of the WERA ™ brand. Nevertheless, it is possible to use another specific bit holder, which can be made in one piece with the ring.

Claims (3)

claims A socket (10) for screwing a screw (11), comprising: a body (13) extending longitudinally along an axis (X10) provided, in an anterior portion (31), with a bearing face (36); ); means (14) for rotating a screw bit (16) about the axis; means (27, 41) for securing in axial rotation the body (13) with the drive means (14); and, means for holding a screw head (11) in abutment against said bearing face; characterized in that said holding means comprise at least one magnet arranged longitudinally at the rear of the bearing face, preferably several magnets (44), preferably five, arranged regularly about the axis (XI0), their most forward poles are all the same polarity. 2. Bushing according to claim 1, characterized in that the drive means are movable longitudinally in the body (13) and the bushing comprises means for limiting the longitudinal displacement of said drive means in said body (13). 3. Bushing according to claim 2, characterized in that the drive means comprise a bit holder (14), the body comprising a housing (37,38) for said bit holder (14) disposed at the back of the anterior portion (31) of said body, the body further comprising a hose (43) axially between said housing and the bearing face, for the passage of the tip (16).