EP1753582B1 - Screw-driver adapter for a portable tool such as a drill - Google Patents

Abstract

A screw-driver adapter (1) for a portable drill including means for cutting (38) a strip- or blister-type screw reloading member, means for driving (30) said reloading member opposite said cutting means and means for mounting said adapter by clamping (6, 7) same on the rotating drill chuck.

Description

The invention relates to the technical field of automatic portable screwdrivers mounted on drills, see for example the document US-A-4,667,545 .

The portable screwdrivers are to distinguish, of course, screwing machines, known for a long time (see for example document US 873,900 of 1907 ). In these screwing machines, the rotating shaft bearing against the screw heads is carried by a fixed frame and the machine is specifically dedicated to screwing.

The portable screwdrivers mounted on drills, or screwdriver adapters attaching to a drill or portable drill-driver, according to the invention are to distinguish, of course, screwdrivers cabinet as marketed by the company WEBER under the trademark CEDIC, this type of screwdriver with fitted cabinet being described in particular in the documents US 2803274 , US 2886076 , US 3339799 , US 4114663 .

These screwdrivers cabinet arranged, whether said portable or fixed, with or without handle, are all connected by hoses to a power supply box and pneumatic. The screw heads are conventionally adapted to a single screw size and are interchangeable. These heads are typically suspended from a gallows. The set cabinet is large, typically parallelepiped 300 mm about side, and heavy, typically 32 kg. These screwdrivers cabinet are therefore bulky, tiring to move and more expensive.

• brevets américains délivrés sous les numéros 2.009.580 , 2.670.770 , 2.943.652 , 2.982.595 , 3.930.297 , 4.404.877 , 4.428.261 , 4.478.112 , 4.581.964 , 4.625.597 , 4.674.367 , 4.667.545 , 5.027.679 , 5.031.489 , 5.144.870 , 5.167.174 , 5.341.706 , 5.402.695 , 5.473.965 , 5.687.624 , 5.855.151 , 5.927.163 , 5.974.918 , 5.904.079 , 5.988.025 , 6.062.113 ;
• demandes de brevet européen publiées sous les numéros 0.732.177 , 0.757.935 , 0.131.851 , 1.319.474 , 1.293.299 ;
• demandes internationales de brevet publiées sous les numéros 96/00637 , 99/00221 , 99/55494 , 97/24205 , 99/28092 .

The portable screwdrivers or screwdriver adapter charger attaching to a drill or portable drill-driver, according to the invention, are also distinguishable from portable screwdriver tools charger as described in particular in the following documents:

• US patents issued under the numbers 2009580 , 2670770 , 2943652 , 2982595 , 3930297 , 4404877 , 4428261 , 4478112 , 4581964 , 4625597 , 4674367 , 4667545 , 5027679 , 5031489 , 5144870 , 5167174 , 5341706 , 5402695 , 5473965 , 5687624 , 5855151 , 5927163 , 5974918 , 5904079 , 5988025 , 6062113 ;
• European patent applications published under the numbers 0732177 , 0757935 , 0131851 , 1319474 , 1293299 ;
• international patent applications published under the numbers 96/00637 , 99/00221 , 99/55494 , 97/24205 , 99/28092 .

These portable screwdrivers, as described in these prior publications are, for the most part, specifically dedicated to screwing and are not tools adaptable to a drill or portable drill-driver.

In addition, portable screwing tools use flexible strips of screws, tape that the operator must place in a charger.

Such bands have been known in themselves for a long time. In addition to those described in the documents mentioned above, reference may also be made, for example, to US patents published under the numbers 3601168 , 3885669 , 3910324 , 3,967,727 , 4019634 , 4251017 , 4367837 , 4930630 , 5083483 , 5337635 , 5339713 , 5409111 , 5452630 , 5469767 , 5522687 , 5542323 , 5544746 , 5568753 , 5570618 , 5622024 , 5713709 , 5758768 , 5870933 , 6036013 , 6089132 , 6453780 , 6601480 (see EPC B25B23 / 04B).

Automatic screwdrivers available on the market and marketed especially under the brands MAKITA, HOLZER, RYOBI, SENCO, all have the disadvantage that it is difficult to properly position the screw strip in the head of the tool, when charging of the screwdriver.

It is also difficult for some models, in addition, to place the flexible band of screws in the screw reserve housing, barrel. When this housing is not present, as in most existing models (DURASPIN from SENCO, MAKITA 6830 and 6831, SDR401 from RYOBI), the screw strip hangs under the screwdriver. This results in risk of injury to the user, markings and scratches on objects nearby. It also results in discomfort when the user has to work by changing frequently of position: vertical screwing in particular. The screw strip can hide the work area from the view of the user.

The Applicant has sought to solve these technical problems, providing more, unlike the screwdrivers trade mentioned above, a screw adapter suitable for attachment to a drill or a portable drill-driver, means being provided for this The adapter is suitable for all, if not all, of the standard drill or drill driver models.

The plaintiff has indeed noticed that some passionate DIYers, even some professionals, were reluctant to buy a portable automatic screwdriver: the cost of such a device seems disproportionate compared to the occasional uses, even intensive, planned: mounting plates of cladding, plaster, plywood for example.

It has certainly been described in some prior patent documents, the adaptation of a screw head to a drill: see including documents US 6,109,145 , US 5,662,011 or US 3,757,407 . But it turns out that these earlier designs are complex, hardly compatible with a wide variety of drills, and expensive.

In addition, the screwdrivers for drills described in the documents US 3,757,407 , US 5,662,011 and US 6,109,145 provide no solution to the technical problems mentioned above, and that the invention aims to solve: it is difficult in these previous mountings, to put the screws in place in the charger (if it exists) and in the head of the tool, and, when the screwing head is devoid of charger, the flexible screw strip hangs under the tool, with the disadvantages mentioned above.

The refill described in the document US 3,757,407 has particular disadvantages. The user has, first of all, the choice between discarding this refill, complex structure and therefore expensive, or fill it by hand, screw by screw, which is to say the least tedious. Secondly, the refill is not suitable for different shapes and sizes of screws. Third, when a first screw is being driven, the screw which was placed below this first screw is pressed against the rotating axis of the drill, which causes friction and wear of the tool.

Similar observations can be made for the device described in US 4,998,452 .

We can also refer to the documents US 5,101,697 and US5,584,221 which describe screw guns.

• étant pourvu de moyens de montage tels qu'il convient au plus grand nombre, sinon à la totalité des modèles courants de perceuse ou perceuse visseuse ;
• assurant une mise en place rapide et sure des vis dans un chargeur, ce chargeur convenant à différentes formes et longueur de vis ;
• assurant un défilement séquentiel rapide et sans action manuelle (voir US 6.164.170 par contraste) des vis en regard de l'axe tournant de vissage, avec un trajet aussi court que possible des vis lors de ce défilement (voir US 5.239.900 par contraste) ;

cet adaptateur étant de structure robuste, légère, peu encombrante et comportant peu de pièces mécaniques, cet adaptateur étant d'un emploi sûr, aucun organe tournant ou tranchant n'étant laissé apparent lors du vissage (voir par contraste le document US 5.584.221 ).The invention aims to provide a screwdriver adapter for drill or drill screwdriver or other equivalent portable tool, including electrical, this adapter:

• being provided with mounting means such as it is suitable for the greatest number, if not all current models of drill or screwdriver drill;
• ensuring a quick and secure installation of screws in a charger, this charger suitable for different shapes and length of screws;
• ensuring fast sequential scrolling and no manual action (see US 6,164,170 by contrast) screws facing the rotating axis of screwing, with a path as short as possible screws during this scroll (see US5,239,900 by contrast);

this adapter being of robust structure, lightweight, compact and with few mechanical parts, this adapter is a safe use, no rotating or cutting member being left visible when screwing (see by contrast the document US5,584,221 ).

For these purposes, the invention relates, in a first aspect, to a screwdriver adapter for a rotating mandrel portable tool, such as a drill, comprising a sleeve, a magazine and means for the removable assembly of the magazine on the sleeve. .

The sleeve is provided with clamping means on said rotating mandrel so as to enclose the mandrel and a screwdriver, in the mounted position of the adapter.

The charger includes an opening hatch housing for placing a screw refill, the refill being formed of a plurality of screws joined together in a band or contained in a debitable package.

A guillotine is slidably mounted relative to the loader, between a first deployed extended position, rest, and a second retracted position of work, the sliding between these two positions being obtained by pressing a bearing wall of the guillotine against a wall in which a screw must be introduced, the guillotine segmenter screw recharge, during this sliding, to isolate a screw in an internal housing of the charger. Characteristically, this housing opens through the support wall of the guillotine and extends substantially in the direction of slenderness of the sleeve.

• le manchon s'étend suivant cette première direction D1, le chargeur s'étendant suivant une deuxième direction D2, le plan défini par les deux directions D1 et D2 pouvant être placé suivant les besoins de l'utilisateur, dans toute direction radiale par rapport à l'axe de vissage, avant bridage du manchon sur le mandrin ;
• le manchon est pourvu de deux pièces cylindriques coaxiales coulissantes l'une sur l'autre à l'encontre d'un moyen de rappel élastique ;
• une des pièces cylindriques porte les moyens de bridage du mandrin et est monté coulissante à l'intérieur de la deuxième pièce cylindrique, à l'encontre d'un ressort hélicoïdal interne à cette deuxième pièce ;
• la première pièce cylindrique du manchon est pourvue d'une gorge annulaire interne d'appui dudit ressort hélicoïdal, ce ressort étant également en appui, à sa partie extrême opposée, dans une gorge annulaire interne à la deuxième pièce cylindrique du manchon ;
• la gorge annulaire interne est d'une longueur telle qu'elle loge sensiblement toute la longueur du ressort en position extrême rétractée des deux pièces coulissantes du manchon ;
• chacune des deux pièces du manchon comprend une butée, ces butées venant en appui l'une contre l'autre en position extrême rétractée du manchon ;
• une première butée est formée par une surface des moyens de bridage du manchon sur le mandrin, ces moyens de bridage étant montés sur une première pièce cylindrique du manchon ;
• une seconde butée est formée par une surface d'un embout annulaire venant en appui, au jeu fonctionnel près, contre la surface cylindrique externe de la première pièce cylindrique du manchon, cet embout annulaire étant vissé à la deuxième pièce cylindrique du manchon ;
• la deuxième pièce du manchon est pourvue d'un molettage extérieur et est fixée par un montage type queue d'aronde au chargeur ;
• la guillotine comprend une paroi d'appui pourvue d'un trou de passage pour les vis à placer, cette paroi d'appui étant solidaire et sensiblement perpendiculaire à une patte de découpe et à un tube monté coulissant par rapport à un axe interne au chargeur, le coulissement de la guillotine s'effectuant à l'encontre d'un ressort externe à l'axe et interne au tube.

According to various embodiments, the adapter has the following characters, if any combined:

• the sleeve extends in this first direction D1, the charger extending in a second direction D2, the plane defined by the two directions D1 and D2 can be placed according to the needs of the user, in any radial direction relative to the axis of screwing, before clamping the sleeve on the mandrel;
• the sleeve is provided with two coaxial cylindrical pieces sliding one against the other against an elastic return means;
• one of the cylindrical parts carries the clamping means of the mandrel and is slidably mounted inside the second cylindrical part, against a coil spring internal to this second part;
• the first cylindrical part of the sleeve is provided with an internal annular support groove of said helical spring, this spring also bearing, at its opposite end portion, in an annular groove internal to the second cylindrical part of the sleeve;
• the inner annular groove is of a length such that it substantially houses the entire length of the spring in the retracted extreme position of the two sliding parts of the sleeve;
• each of the two parts of the sleeve comprises a stop, these abutments bearing against one another in the retracted extreme position of the sleeve;
• a first stop is formed by a surface of the clamping means of the sleeve on the mandrel, these clamping means being mounted on a first cylindrical part of the sleeve;
• a second stop is formed by a surface of an annular tip abutting, with the functional clearance, against the outer cylindrical surface of the first cylindrical part of the sleeve, this annular tip being screwed to the second cylindrical part of the sleeve;
• the second piece of the sleeve is provided with an external knurling and is fixed by a dovetail assembly to the charger;
• the guillotine comprises a bearing wall provided with a passage hole for the screws to be placed, this support wall being integral and substantially perpendicular to a cutting tab and to a tube slidably mounted relative to an axis internal to the charger , the sliding of the guillotine being effected against a spring external to the axis and internal to the tube.

• la figure 1 est une vue en perspective d'un adaptateur, selon un mode de réalisation de l'invention ;
• la figure 2 est une vue analogue à la figure 1, le manchon et le chargeur étant vus séparés, avec leurs moyens d'assemblage ;
• la figure 3 est une vue en perspective du chargeur ;
• la figure 4 est une vue en perspective éclatée des différentes pièces formant le chargeur vu en figure 3 ;
• la figure 5 est une vue analogue à la figure 4, les pièces formant le chargeur étant représentées suivant un autre angle d'observation ;
• la figure 6 est une vue en coupe longitudinale du chargeur représenté en figures 3 à 5 ;
• la figure 7 est une vue de détail de la partie gauche de la figure 6 ;
• les figures 8 et 9 sont des vues en perspective, suivant deux angles d'observation différents, d'un manchon tel que représenté en figures 1 et 2;
• la figure 10 est une vue en perspective éclatée des différentes pièces formant le manchon représenté en figures 8 et 9 ;
• la figure 11 est une vue en coupe longitudinale du manchon représenté en figure 10.

Other objects and advantages of the invention will become apparent from the following description of embodiments, which description will be made with reference to the accompanying drawings, in which:

• the figure 1 is a perspective view of an adapter, according to an embodiment of the invention;
• the figure 2 is a view similar to the figure 1 , the sleeve and the magazine being seen separated, with their assembly means;
• the figure 3 is a perspective view of the charger;
• the figure 4 is an exploded perspective view of the different parts forming the charger seen in figure 3 ;
• the figure 5 is a view similar to the figure 4 , the parts forming the loader being represented according to another angle of observation;
• the figure 6 is a longitudinal sectional view of the loader represented in Figures 3 to 5 ;
• the figure 7 is a detail view of the left side of the figure 6 ;
• the Figures 8 and 9 are perspective views, according to two different angles of observation, of a sleeve as shown in FIG. figures 1 and 2 ;
• the figure 10 is an exploded perspective view of the various parts forming the sleeve shown in FIG. Figures 8 and 9 ;
• the figure 11 is a longitudinal sectional view of the sleeve shown in FIG. figure 10 .

The adapter 1 comprises a sleeve 2 and a charger 3. The sleeve extends in a first direction D1, the charger 3 extending in a direction D2 substantially perpendicular to the first direction D1.

The sleeve 2 is first described with reference to the figures.

The sleeve 2 is provided with a first cylindrical part 4 slidably mounted inside a second coaxial cylindrical part 5.

The first cylindrical part 4 of the sleeve 2 is intended to be mounted flanged on the mandrel of a drill, not shown. Chuck means here the element of the drill that receives the drill, this chuck being self-tightening or requiring the use of a chuck key.

By flange, here denotes a part as referenced 6 in figure 10 , this piece being in the form of a collar or stirrup and being tightened for example by means of a screw as referenced 7.

Advantageously, the length of the sleeve 2 is such that it covers substantially all the chuck of the drill as well as the screw bit.

When the adapter 1 is mounted on the drill, no rotating member is thus left in free access.

At its extreme end farthest from the mandrel, the first cylindrical part 4 of the sleeve 2 is provided with an internal annular groove 8 for supporting a helical spring 9, this spring also being supported at its opposite end portion, in an inner annular groove 10 to the second cylindrical part 5 of the sleeve 2.

As it will appear more completely later, during screwing, the spring 9, or any other equivalent elastic means, is compressed as a result of sliding in the direction D1 of the first cylindrical part 4 in the second cylindrical part 5 coaxial.

An annular tip 11 abuts, with the functional clearance close, against the outer cylindrical surface of the first part 4, this annular tip 11 being provided with a thread 12 on its outer face, this thread 12 being complementary to a thread 13 internal to the second cylindrical part 5 of the sleeve 2.

The annular tip 11 can thus be mounted screwed onto the second cylindrical part 5, until the transverse annular projection 14 of this endpiece 11 bears against the extreme annular transverse edge 15 of the second cylindrical part 5 of the sleeve 2.

As it appears on the figure 11 , the annular tip 11 defines an inner cylindrical sliding guide surface 16 for the first cylindrical part 4 of the sleeve 2.

The inner annular groove 10 of the second part 5 is of a length, measured in the direction D1, such that substantially all the turns of the coil spring 9 can be housed in the maximum compressed state of this spring 9.

In this extreme position, the annular tip 11 can serve as a bearing abutment of the flange 6.

The second cylindrical part 5 of the sleeve 2 is provided with a through hole 17 arranged in the direction D1, this through hole allowing the passage with functional clearance of the screwdriver tip mounted on the drill mandrel.

The sleeve 2 and the charger 3 are assembled, reversibly, by a dovetail type assembly.

For this purpose, the second cylindrical part 5 is provided in its front end, opposite the first part 4, with a notch 18, this notch being delimited by a transverse rear face 19, two faces. substantially parallel sides 20,21 and two edges falling 22,23 at the front end part of the part 5, these falling edges 22,23 forming tabs housed in corresponding grooves 24,25 of the loader 3, these grooves 24,25 and the falling edges 22, 23 extending substantially along the second direction D2.

The second cylindrical part 5 of the sleeve 2 is provided with a through-hole 26 with internal threading for the establishment of a screw 27, this screw 27 being housed also in a lateral hole 28 of the loader 3, when the sleeve is in the mounted position on the charger.

The outer surface of the second cylindrical part 5 of the sleeve 2 is provided with a knurling or roughness making it easier to hold the adapter 1 in hand while it is being screwed.

The leading end portion of the second piece 5 of the sleeve 2 is frustoconical, thus reducing the weight of the material used and providing a visual cue for the mounting direction of the adapter 1.

The charger is now described more particularly.

The loader 3 comprises two movable parts 29,30, the first movable part 29 being referred to hereinafter as "guillotine" and being slidably mounted in the loader 3 in the first direction D1.

The second moving part 30, hereinafter referred to as "pusher", moves during sliding screwing substantially along the second direction D2.

The guillotine 29 and the pusher 30 are movable with respect to a guiding casing formed of the essentially three-piece assembly, namely a base part 31 and two substantially identical upper parts 32, 33, the assembly thus formed having a symmetry with respect to a longitudinal plane 5 containing the direction D2.

Each of the two upper pieces 32, 33 is provided on its lateral external face with a groove 24, 25 as previously presented.

The upper parts 32, 33 are assembled to the base piece 31, for example by screwing, six screws 34 being shown in FIG. figure 5 these screws 34 through the thickness of the base piece 31 to be housed in the corresponding threaded holes 35 of the upper parts 32,33.

The guillotine 29 comprises an upper support wall 36 provided with a through-hole 37 for the screw and the screw-bit.

This bearing wall is, as it will appear more completely later, intended to come into contact with the wall in which a screw through the hole 37 is to be driven.

The bearing wall 36 extends substantially in a plane perpendicular to the first direction D1.

This support wall is integral or assembled to a tab 38 sliding in a housing 39 defined by two internal grooves 40,41 respectively disposed on the upper parts 32,33 opposite.

The guillotine 29 is assembled for example by a screw 42 to a small tube 43 extending parallel to the tab 38 and the direction D1.

The lower end portion 44 of this small tube 43 has an annular extra thickness sliding in a housing 45 defined by the facing of two grooves 46,47 extending on the inside of the upper parts 32,33 coaxial with the small tube 43 and mounted on the base part 31, an axis 48 substantially placed in the plane of symmetry S of the loader 3 supporting a helical spring 49 or any other equivalent elastic means.

As it appears in figure 6 in particular, this spring 49 is supported inside the small tube 43 and bears against the transverse upper face 50 of the base piece 31, in the housing 45.

When the spring 49 is in its most relaxed position, the support wall 36 is the farthest from the upper face 50 of the base wall 31, this position being that of the adapter, before use.

During screwing, the user plates the bearing wall 36 against the wall in which the screw must be inserted and thus causes firstly the sliding of the guillotine 29 in the loader 3, the leg 38 sliding in its housing 39 while the extra thickness 44 of the tube 43 slides in its housing 45, the coil spring 49, of low stiffness, being compressed.

In the maximum compressed state of this spring 49, the support wall 36 is abutted in a housing 51 of the loader 3. An additional pushing force of the user, on the adapter 1, in the direction D1, causes the compression of the helical spring 9 of the sleeve 2, by sliding of the first cylindrical part 4 in the second cylindrical part 5 of this sleeve 2.

The guillotine being maintained in its compressed state represented in figure 7 , the sliding relative to each other of the two parts 4,5 of the sleeve 2 leads to the passage, in the slot 52, of the screw bit, not shown.

This screwing bit then bears against a screw head, the user thus being able to pass this screw through the opening 37 of the guillotine 29.

When the screwing operation is completed, the relaxation of the effort of the user causes the expansion of the springs 9 and 49, the adapter 1 returning to its initial state as shown in FIG. figure 1 .

As has been said previously, the magazine 3 comprises a pusher 30. This pusher 30 is mounted integral with an inner plate 60 to the magazine 3, via a projection of this plate 60 as it appears in FIG. figure 5 . This protrusion of the plate 60 slides, as and when the screws stored in the charger 3, consume in an oblong slot 61 of a plate 62 slidably mounted in grooves of the base part 31.

The piece 60 and the pusher 30 are constantly biased by an elastic means to push a screw band housed in the feeder 3, in the direction of the guillotine 29.

More specifically, the sliding of the guillotine 29 and more particularly of its lug 38 in its housing 39 causes the cutting of a strip of material joining two screws adjacent to a screw strip placed in the magazine 3.

To fill the magazine 3, the operator slides the plate 62, thus opening a space 63 inside the magazine 3, space in which the operator can place, either, a flexible band of screws, or a blister-type packaging of screw, the only practical condition of use is that the effort to uncouple the package, by the paw 38 sharp, remains modest so as not to unnecessarily tire the operator when sliding the guillotine 29.

The space 63 is advantageously of a large width, so that a large number of different screws can be used, these screws being maintained in strip or blister. It should be noted that the cutting by the guillotine ends substantially simultaneously with the support of the screw bit against the screw head, so it is not necessary that the charger is provided with a housing of shape and dimensions specifically related to a given type of screw, which would be disconnected from his tape or blister, waiting screwing.

Furthermore, the tab 38 of the guillotine 29, during its sliding in its housing 39 and the cutting of the strip or the packaging of the screws, forms a sheath, the screw to be placed and maintained in line according to the direction D1 and can only follow this direction imposed during screwing.

The adapter as just described can be mounted on a very large number of drills or portable tools trade: slots 70 longitudinal in the first cylindrical part 4 of the sleeve 2 allow clamping on different diameters of mandrels.

The mounting of the clamped sleeve 2 clamping the mandrel leads to the fact that no rotating member is left accessible, the tool thus being very safe to use.

The charger and the sleeve may be made of light alloy, such as aluminum alloy or at least partly of polymer material, optionally reinforced with fibers. The adapter is thus of a weight quite bearable by the user.

No screws are left free, hanging under the adapter. Putting the screws into the charger is fast by using screw strips or a blister containing screws, or any other rigid and cutable packaging, placed in the space 63 of the magazine 3.

• d'une guillotine coulissante venant trancher les bandes de clous ou rivets ;
• d'un manchon bridé sur un outil de frappe ;
• de moyens élastiques internes au manchon à pièces coulissantes et de moyens élastiques propres à la guillotine ;

l'ensemble assurant que le clou ou le rivet est successivement et rapidement, voire simultanément :

• isolé de la bande de recharge logée dans le chargeur ;
• placé en regard de l'emplacement où il doit être introduit et en regard de l'outil de frappe.

Although the description has been made with reference to the preferred embodiment of a screw adapter, some of the features described above will find application for a nailing or riveting adapter, particularly with respect to the combination of:

• a sliding guillotine slicing the strips of nails or rivets;
• a flanged sleeve on a striking tool;
• elastic means internal to the sleeve with sliding parts and elastic means specific to the guillotine;

the assembly ensuring that the nail or the rivet is successively and quickly, or simultaneously:

• isolated from the charging strip housed in the charger;
• placed next to the place where it must be introduced and next to the striking tool.

• placer l'extrémité de l'outil, c'est à dire la paroi 36 de guillotine 29 à l'endroit souhaité pour le placement de la vis, puis ;
• exercer une pression sur l'adaptateur, suivant la direction D1, une légère pression provoquant le coulissement de guillotine, et le tranchage de la bande de vis, isolant la vis à placer, une plus grande surface de l'adaptateur étant alors en appui contre la paroi de travail ;
• exercer une pression plus élevée pour aller à l'encontre du ressort de mandrin et provoquer le vissage de la vis isolée.

As has been said above, in fact, by the size and the stiffness of the springs of the mandrel 2 on the one hand and the guillotine 29 on the other hand, the user of the tool goes first of all:

• place the end of the tool, ie the guillotine wall 29 at the desired location for the placement of the screw, then;
• exerting pressure on the adapter, in the direction D1, a slight pressure causing the sliding of the guillotine, and the slicing of the screw strip, isolating the screw to be placed, a larger surface of the adapter then bearing against the working wall;
• exert a higher pressure to counter the chuck spring and cause screwing of the insulated screw.

The risks of mishandling are therefore reduced: the operator can aim with the guillotine wall 36, the desired location to introduce the screw, change in case of misplacement before confirming by pressing more strongly on the tool.

Claims (11)

1. A screwing adaptor for portable tool with rotary chuck, such as a drill, comprising:

   a sleeve (2), and

   a charger (3), and

   means allowing the release assembly of the charger (3) to the sleeve (2),

   the sleeve (2) being provided with flanging means on the rotary chuck, so as to enclose the chuck and a screwing tip, in the mounted position of the adaptor,

   the charger (3) comprising a housing with an opening flap to place therein a screw refill, this refill being constituted with a plurality of screws gathered together in a band or contained in a ready for cutting up packaging,

   a guillotine (29) being slidingly mounted with respect to the charger (3), between a first end extended relaxed position and a second working retracted position, the sliding motion between these two positions being achieved by pressing a support wall (36) of the guillotine (29) on a wall in which the screw must be inserted, the guillotine (29) segmenting the screw refill, during this sliding motion, to separate a screw in an inner housing of the charger (3), characterized in that this housing goes through the support wall (36) of the guillotine (29) and extends substantially according to the slenderness ratio direction of the sleeve (2).
2. A screwing adaptor according to claim 1, characterized in that the sleeve (2) extends according to this first direction (D1), the charger extending according a second direction (D2), the plane defined by both directions (D1 and D2) being able to be positioned according to the needs of the user, in any radial direction with respect to the screwing axis, before the flanging of the sleeve (2) on the chuck.
3. A screwing adaptor according to claim 1 or 2, characterized in that the sleeve (2) is provided with two coaxial cylindrical sliding parts one over the other against an elastic spring-loaded means.
4. A screwing adaptor according to claim 3, characterized in that one of the cylindrical parts carries the flanging means of the chuck and is slidingly mounted inside the second cylindrical part against a helical spring internal to this second part.
5. A screwing adaptor according to claim 4, characterized in that the first cylindrical part (4) of the sleeve (2) is provided with a support inner annular groove (8) of said helical spring (9), this spring (9) being also supported, at its opposed end part, in an inner annular groove (10) at the second cylindrical part (5) of the sleeve (2).
6. A screwing adaptor according to claim 5, characterized in that the inner annular groove (10) has such a length that it houses substantially all the length of the spring (9) in end retracted position of both sliding parts of the sleeve (2).
7. A screwing adaptor according to any one of the claims 3 to 6, characterized in that each of both parts of the sleeve comprises an abutment, theses abutments being supported one against the other in end retracted position of the sleeve (2).
8. A screwing adaptor according to claim 7, characterized in that a first abutment is constituted by a surface of the flanging means of the sleeve (2) on the chuck, this flanging means being mounted on a first cylindrical part of the sleeve (2).
9. A screwing adaptor according to claim 8, characterized in that a second abutment is constituted by a surface of an annular tip (11) being supported, at the right operational clearance, against the outer cylindrical surface of the first cylindrical part (4) of the sleeve (2), this annular tip (11) being screwed in the second cylindrical part (5) of the sleeve (2).
10. A screwing adaptor according to any one of the claims 3 to 9, characterized in that the second part of the sleeve is provided with an outer knurling and is attached through a dovetail-like assembly to the charger (3).
11. A screwing adaptor according to any one of the claims 1 to 10, characterized in that the guillotine (29) comprises a support wall (36) provided with a through-hole (37) for the screws to be placed, this support wall (36) being integral and substantially perpendicular to a cutting leg (38) and to a tube (43) slidingly mounted with respect to an axis (48) internal to the charger (3), the sliding motion of the guillotine (29) being performed against a spring external to the axis (48) and internal to the tube (43).

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