Combination fastening tool

Abstract

Fastening tool (1) comprising a nose (9) for guiding fasteners and a striking blade for said fasteners, characterized in that said fastening tool (1) is configured to pull a fastener of a first type and at least one fastener of a second type having dimensional and / or geometric characteristics different from those of said fastener of the first type.

Description

TECHNICAL FIELD

[0001] The invention relates to a fastening tool configured to pull fastening elements of a first type and fastening elements of at least a second type having dimensional and / or geometric characteristics different from those of the fastening elements of the first type. STATE OF THE ART

[0002] Anchoring or fastening tools are tools used to drive a fastener (staple, nail, awl, pin, etc.) into a substrate (particularly wood, concrete, or steel). This is achieved by a moving blade striking the fastener (for example, the head of a nail) within a firing chamber, propelling it so that it anchors itself in the substrate. The blade is set in motion by a drive mechanism that uses, for example, thermal, electrical, and / or pneumatic energy.

[0003] Generally, such a tool comprises a nose (also called a tip guide) and a shear block (also called a connector) that forms the internal boundary of the firing chamber. The shear block is an integral part of a magazine that is removably mounted on the nose of the tool. The fasteners stored in the magazine are fed one by one into the firing chamber through a feed window in the shear block.

[0004] In the case of a nail gun type tool, a refill usually comes in the form of a strip of nails, the nails being placed side by side and held in position by appropriate means such as adhesive strips.

[0005] Depending on the application, nails have different characteristics, particularly with regard to dimensions, geometry and mechanical properties.

[0006] For example, regarding the geometry of a nail, the head can be round or D-shaped. The shank can be centered or off-center relative to the head. The shank can be smooth, serrated, or twisted.

[0007] As an example, in relation to mechanical properties, the nail can undergo various heat treatments (quenching, tempering, annealing) in the mass or on the surface, in particular to increase its mechanical properties (resistance to breaking, elastic limit, hardness).

[0008] It is also noted that depending on the nails, and in particular according to the shape of the head, the strip is more or less dense, and in other words the number of nails varies on a strip of the same size.

[0009] Traditionally, a fastening tool is associated with a specific type of nail. Indeed, depending on the type of nail used, several components of the tool have different designs. These components include the nose, the blade, and the shear block.

[0010] Indeed, regardless of the type of nails, in order to consistently achieve a quality shot, several technical constraints must be respected, including: precise percussion of the nail head by the blade, in particular to avoid a double shot (simultaneous projection of two nails) and to limit friction forces; precise guidance of the nail in the firing chamber, so that the trajectory of the nail exiting the chamber is substantially coincident with the direction of the blade.

[0011] The objective of the present invention is to propose in particular a fastening tool enabling the pulling of fastening elements of different types, namely having in particular different dimensional and / or geometric characteristics. DESCRIPTION OF THE INVENTION

[0012] According to a first aspect, the invention relates to a guide nose for fasteners for a fastening tool, such as a nail gun, characterized in that said nose is configured to pull a fastener of a first type and a fastener of at least a second type having different dimensional and / or geometric characteristics from those of said fastener of the first type, the nose having distinct locations, in particular for heads, of said fasteners of the first and second type.

[0013] Such a nose allows for the precise positioning of the first and second type of fastening elements relative to a firing pin in a firing chamber. This positioning significantly reduces double shots (firing two fastening elements simultaneously) and the frictional forces induced on the fired fastening element, while optimizing firing accuracy.

[0014] The nose according to the invention may comprise one or more of the following features, taken individually or in combination with each other: The geometric and / or dimensional characteristics of the heads of the first and second type fastening elements are different; the relative position of the rod with respect to the head of the first and second type fastening elements is different; the nose delimits at least in part a firing chamber and comprises: a first bearing zone adapted to cooperate with a head of said first type fastening element for the purpose of its positioning before firing; a second bearing zone distant from said first zone and adapted to cooperate with a head of said second type fastening element for the purpose of its positioning before firing; the nose comprises a stepped wall defining said first and second bearing zones; said first and second bearing zones are aligned along an axis of elongation of said wall; the nose comprises a rim adapted to engage in a groove of a percussion blade of a fastening element of a fastening tool;said edge is supported by said wall; said edge defines said first support zone; the first and second support zones are concave, for example cylindrical.

[0015] According to a second aspect, the invention further relates to a percussion blade for a fastener for a fastening tool, such as a nail gun, characterized in that said blade is configured to drive a fastener of a first type and at least one fastener of a second type having dimensional and / or geometric characteristics different from those of said fastener of the first type, the blade comprising a percussion surface configured to strike, in particular, the heads of said fasteners placed respectively in separate locations of a guide nose of said tool.

[0016] This blade design allows for precise striking of both first- and second-type fasteners, adapting to the reloading process and, more specifically, to the relative arrangement of the fasteners. This type of striking minimizes double shots and the frictional forces exerted on the struck fastener, while simultaneously optimizing firing accuracy.

[0017] The blade according to the invention may comprise one or more of the following features, taken individually or in combination with each other: the geometric and / or dimensional characteristics of the heads of the first and second type fixing elements are different; the relative position of the rod with respect to the head of the first and second type fixing elements is different; the blade has a generally elongated shape and is symmetrical along a longitudinal plane, the blade comprising: means for fixing to a drive device, located at a first longitudinal end; the striking surface of a head of said first and second type fixing elements, said striking surface being located at a second longitudinal end opposite to the first end; an elongated body located between the first end and the second end, said body being able to slide in a firing chamber in which is located said first or second type fixing element to be struck;said body comprising at least one longitudinal groove adapted to receive a lip of a guide nose for fastening elements of a fastening tool; the groove is centered with respect to said plane and opens onto both a top face and flush with the striking surface of the blade; the blade comprising at least one first recess opposite said groove, said recess being adapted to receive a projecting tongue of a shear block of a fastening tool; said recess opens onto both a side, a bottom face and said striking surface of the blade; the blade comprising a second recess symmetrical to said first recess along said plane; said top face and said striking surface are connected via at least one top chamfer; said bottom face and said striking surface are connected via at least one bottom chamfer.

[0018] According to a third aspect, the invention relates to a shear block of a magazine mounted to support the nose of a fastening tool along a joint plane, said shear block comprising at least one guide track of said fastening element of the first type and / or of said fastening element of the second type, said track being opposite said first and second support areas.

[0019] Such a shear block allows the fired fastener to be guided precisely so that it does not come into contact with the fastener located just below, while stabilizing the trajectory of the fired fastener for the benefit of firing accuracy.

[0020] The shear block according to the invention may comprise one or more of the following features, taken individually or in combination with each other: said shear block includes a central feed window for said chamber, said window extending along the axis and opening into said chamber; the guide track is formed by two guide notches for said head of the first type fastener and / or said head of the second type fastener, said notches being opposite each other and bordering at least in part said window; said guide track protrudes inside said chamber relative to said joint plane; said shear block includes at least one tab protruding relative to said joint plane and in which one of the two notches is formed, said tab being able to engage in at least one recess of said blade.

[0021] According to a fourth aspect, the invention relates to a fastening tool comprising a nose as described above and / or a blade as described above. This fastening tool is configured to pull a fastening element of a first type and at least one fastening element of a second type having dimensional and / or geometric characteristics different from those of said fastening element of the first type.

[0022] Such a versatile (or combined) fastening tool allows a user to pull fastening elements of different types intended for different applications, notably to the benefit of productivity.

[0023] The tool according to the invention may comprise one or more of the following features, taken individually or in combination with each other: the geometric and / or dimensional characteristics of the heads of the first and second type fixing elements are different; the relative position of the rod with respect to the head of the first and second type fixing elements is different; the nose delimits at least in part a firing chamber, said nose comprising a first support zone capable of cooperating with a head of said first type fixing element for the purpose of its positioning before firing, and at least a second support zone distant from said first zone and capable of cooperating with a head of said second type fixing element for the purpose of its positioning before firing; the blade is movable in translation with respect to said nose along an axis, said blade being capable of striking a head of said first and second type fixing elements;The tool comprises a magazine having a shear block mounted to rest on the nose along a parting line, said shear block comprising at least one guide track for said first-type fastener and / or said second-type fastener, said track being opposite said first and second bearing areas; said shear block comprising a central feed window for said chamber, said window extending along the axis and opening into said chamber; the guide track is formed by two guide notches for said head of the first-type fastener and / or said head of the second-type fastener, said notches being opposite each other and at least partially bordering said window; said guide track protrudes inside said chamber relative to said parting line;said shear block comprises at least one tab projecting from said joint plane and in which one of the two notches is formed, said tab being capable of engaging in at least one recess of said blade; the blade comprises a groove extending along said axis and being capable of receiving a nose flange. BRIEF DESCRIPTION OF THE FIGURES

[0024] The invention will be better understood and other details, features and advantages of the present invention will become more apparent upon reading the following description, given by way of non-limiting example and with reference to the accompanying drawings, in which: there figure 1 is a perspective view of a fastening tool according to the invention, illustrating in particular the mounting of a magazine on a nose of the tool; the figure 2 is a detailed view of the figure 1 ; there figure 3 is a front view of a refill of a first type of nail intended to be inserted into the tool's magazine; the figure 4 is a front view of a refill of a second type of nail intended to be inserted into the tool's magazine; the figure 5 is a view juxtaposing two half-cross-sections of a firing chamber of the fastening tool, namely the left part with a magazine for the first type of nails and the right part with a magazine for the second type of nails; figures 6 et 7 are respectively longitudinal and transverse cross-sectional views of the fastening tool on which the magazine for the first type of nails is mounted, in a so-called "before firing" position; figures 8 à 9 are respectively longitudinal and transverse cross-sectional views of the fastening tool on which the magazine for the first type of nails is mounted, in a so-called "firing" position; figures 10 à 11 are respectively longitudinal and transverse cross-sectional views of the fastening tool on which the magazine for the second type of nails is mounted, in a "before firing" position; figures 12 à 13 are respectively longitudinal and transverse cross-sectional views of the fastening tool on which the magazine for the second type of nails is mounted, in a "firing" position; the figure 14 is a side view of a blade of the fastening tool; the figure 15 is a front view of the blade of the figure 14 . DETAILED DESCRIPTION

[0025] The fastening tool 1 shown on the figure 1 is in the present case a nailer 1. The tool 1 includes a housing 2 in which is a drive device 3 configured to move a blade 4 along a longitudinal axis X. The blade 4 is in this case capable of striking a head 5a, 5b of a nail 6a, 6b, present in a firing chamber 7 and extracted from a feed magazine 8a, 8b, to launch this nail 6a, 6b so that it can anchor itself in a support material.

[0026] At the front of the housing 2, a nose 9 and a shear block 10a, 10b internally delimit the firing chamber 7 and a mouth 11 through which the nail 6a, 6b leaves the chamber 7. The shear block 10a, 10b is an integral part of the magazine 8a, 8b mounted removably on the nose 9 of the tool 1. The nails 6a, 6b stored in the magazine 8a, 8b are introduced one by one into the firing chamber 7 through a feed window 12 made in the shear block 10a, 10b.

[0027] The tool 1 further includes a gripping and handling handle 13 formed by the housing 2. An actuating trigger 14, located in the upper part of the handle 13, allows the user to initiate firing, generally under the condition that a probe 15a, 15b is engaged.

[0028] The feeler 15a, 15b is an integral part of an assembly called the "feeler assembly" mounted in particular mobile in translation relative to the nose 9 of the tool 1. The feeler assembly and the trigger 14 are complementary means enabling the user to initiate firing safely.

[0029] More specifically, the probe 15a, 15b allows the user to aim for the location of the nail 6a, 6b on the backing material by bringing the probe 15a, 15b into contact with it. The probe assembly further includes a frame 16 having a central head 17 movably mounted on the nose 9 of the tool 1 and two arms 18 overlapping the drive device 3, each arm 18 extending from the head 17 and being connected to the drive device 3 at its free end. The probe assembly also includes a device for adjusting the depth of penetration of the probe 15a, 15b. The adjustment device includes a clevis 19 fixed to the head 17 of the frame 16 by means of two rivets 20 and a shaft 21 comprising: a first threaded portion 22 on which the probe 15a, 15b is mounted, and a second portion 23 on which a wheel 24 is pinned, the second portion 23 being mounted movable in rotation relative to the clevis 19.

[0030] The rotation of the knob 24 by the user thus allows the depth of the probe 15a, 15b to be adjusted.

[0031] According to the invention, the tool 1 is configured to pull a nail of a first type 6a (represented on the figure 3 ) and at least one nail of a second type 6b (represented on the figure 4 ) exhibiting dimensional and / or geometric characteristics different from those of the first type 6a nail.

[0032] Thus, as described in the following description, to switch from one application to another (and in other words to switch from the first type of nails 6a to the second type of nails 6b or vice versa), the user only needs to swap at most the supply magazine 8a, 8b and the probe 15a, 15b.

[0033] In the following description and as shown in the figures, the first type of nail 6a, called "B / B nail" for (Wood on Wood), is shown in the figure 3 and the second type of 6b nails, called "M / B nail" for (Metal on Wood), is shown on the figure 4 .

[0034] The B / B 6a nail is designed to fasten one wooden element to another. Examples of wooden elements include battens, slats, counter-battens, boards, etc. The B / B 6a nail shown in the image... figure 3 is a nail known under the registered trademark RounDrive®. Such a B / B 6a nail has the following technical characteristics: a round head 5a; a shank 25a offset from the head 5a and mostly serrated; a point 26a with four inclined sides; the nail 6a is made of steel, for example galvanized.

[0035] Such a B / B 6a nail allows for a large number of B / B 6a nails per 26a refill. As illustrated on the figure 3 A refill pack 26a consists of a strip of nails 6a, the nails 6a being placed side by side with a constant spacing and held in position by adhesive paper strips 28a. The nails B / B 6a are angled relative to the extension direction of the adhesive strips 28a.

[0036] The M / B 6b nail is designed to fasten a metal component to a wooden component. The metal component could be, for example, a connector, a bracket, an angle bracket, etc. As mentioned above, the wooden component could be, for example, a batten, a lath, a counter-batten, a sheathing board, etc. The M / B 6b nail shown in the image... figure 4 It notably features the following technical characteristics: a round head 5b; a shank 25b centered in relation to the head 5b and mostly serrated; a point 26b with four inclined sides; the nail 6b is made of hardened steel, for example galvanized.

[0037] Compared to a 26a refill of B / B 6a nails, the density of M / B 6b nails on a 26b refill is lower. Similar to the B / B 6a nails, the M / B 6b nails are placed close together with a constant spacing and held in position by 28b adhesive paper strips; the M / B 6b nails are also angled relative to the extension direction of the 28b adhesive strips.

[0038] As presented above and illustrated on the figures 3 et 4 A B / B 6a nail and an M / B 6b nail have different dimensional and / or geometric characteristics. In this case, to switch from one application to another (in other words, to switch from the B / B 6a nail to the M / B 6b nail or vice versa), the user only needs to swap the feed magazine 8a, 8b and the probe 15a, 15b.

[0039] Thus, in the following description, for B / B 6a nails, we will refer to the B / B 8a magazine and the B / B 15a probe. Similarly, for M / B 6b nails, we will refer to the M / B 8b magazine and the M / B 15b probe.

[0040] It should also be noted that the mechanical properties of B / B 6a and M / B 6b nails are different. The hardening of the M / B 6b nail allows it to exhibit, in particular, greater tensile strength, yield strength, and hardness than the B / B 6a nail.

[0041] As illustrated on the figures 6 And 8 , the B / B 15a probe includes a U-shaped front end equipped with several pins 29 intended to come into contact with the support material.

[0042] As illustrated on the figures 10 And 12The M / B 15b probe includes a centering element 30 mounted on return means. In use, prior to firing, the user positions the centering element 30 in a hole in the metal component to be fastened. Then, during firing, the centering element 30 retracts to allow the M / B 6b nail to pass through. Such an M / B 15b probe allows the M / B 6b nail to be driven precisely through the desired hole in the metal component.

[0043] The drive device 3 can move the blade 4 along said axis X from thermal and / or pneumatic and / or electrical energy.

[0044] According to the embodiment illustrated in the figures, the drive device 3 is a heat engine. The blade 4 is in this case fixed to a movable piston in a combustion chamber. The piston is set in motion by the combustion of a mixture of air and gas from a cartridge mounted in the tool 1.

[0045] We will now describe the different aspects of the invention that can be integrated, independently of each other or in combination with each other, into tool 1 of the figure 1 .

[0046] In the mounted position, the nose 9, the shear block 10a, 10b and the blade 4 have a common plane of symmetry denoted S passing in particular through the longitudinal axis X.

[0047] By convention, the following directions are defined with respect to tool 1: a longitudinal, horizontal direction, coinciding with the X axis, a transverse, horizontal direction, defined by an axis perpendicular to the plane S, a vertical direction, defined by an axis passing through the plane S and perpendicular to X. Nez (also called a guide-tip)

[0048] One aspect of the invention relates to the nose 9 of tool 1. The nose 9 is configured to pull a B / B 6a nail and an M / B 6b nail. The nose 9 thus has a B / B 79a slot ( figure 6 ) in which the nail B / B 6a is placed before being pulled and a location M / B 79b ( figure 10 ) in which the nail M / B 6b is placed before being pulled, the location B / B 79a being distinct from the location M / B 79b.

[0049] The nose 9 is symmetrical along plane S. The nose 9 partially delimits a firing chamber 7 and includes a first support zone 31a (called support zone B / B) capable of cooperating with the head 5a of the nail B / B 6a for its positioning before firing ( figure 6 ). The nose 9 includes a second support zone 31b (called the M / B support zone) located longitudinally from the first zone 31a and capable of cooperating with a head 5b of the M / B nail 6b for positioning prior to firing ( figure 10 ).

[0050] According to the embodiment illustrated in the figures, the nose 9 comprises a fixing base 32 to the fixed part of the drive device 3 and an extension 33 (or beak) oriented along the X axis, this extension 33 thinning out from the base 32.

[0051] As illustrated on the figure 5 The nose 9 internally comprises a cavity 34 extending along the X axis and partially forming the firing chamber 7. The cavity 34 is delimited vertically by an upper wall 35 and opens inferiorly onto a flat joint surface 36 with the shear block 10a, 10b. The cavity 34 is laterally delimited by two concave edges 37, the cavity 34 flaring out from the upper wall 35 to the flat surface 36.

[0052] As illustrated on the figures 6 , 8 , 10 And 12The upper wall 35 is stepped and defines the support zones B / B 31a and M / B 31b, the support zone M / B 31b being slightly raised relative to the support zone B / B 31a. The support zones B / B 31a and M / B 31b are aligned along an axis of elongation of the wall 35, and in other words along the X axis.

[0053] As illustrated in particular on the figure 5 The wall 35 includes a rim 38 (or lug) projecting vertically into the chamber 7 and centered with respect to plane S, this rim 38 having a rectangular cross-section. The rim 38 extends longitudinally from the base 32 of the nose 9 and is adapted to engage in a groove 39 of the blade 4.

[0054] As illustrated in particular on the figure 6 , the rim 38 defines the support zone B / B 31a.

[0055] The support areas 31a and 31b are concave, and more precisely cylindrical. As illustrated on the figure 7 , the support area B / B 31a has a radius substantially equal to that of the head 5a of the nail B / B 6a so as to position the head 5a precisely in the firing chamber 7. In the same way, the support area M / B 31b has a radius substantially equal to that of the head 5b of the nail M / B 6b.

[0056] The support zones B / B 31a and M / B 31b are connected longitudinally via a sloping connecting zone 40. The support zone B / B 31a is extended from a rear stop to the connecting zone 40. The support zone M / B 31b is extended from the connecting zone 40 to the mouth 11 of the firing chamber 7.

[0057] As illustrated on the figure 7 , each lateral edge 37 of the cavity 34 is connected to the rim 38 and to the M / B support area 31b via a substantially horizontal plane recess 42.

[0058] As illustrated on the figure 2 The nose 9 further comprises two pins 43 projecting from the flat surface 36, positioned on either side of the cavity 34, each of which is adapted to engage in a bore 44 of complementary shape formed in a lug 45 of the shear block 10a, 10b. The nose 9 also has two teeth 46 projecting from the flat surface 36. The teeth 46 extend longitudinally and are positioned on either side of the cavity 34, each tooth 46 being adapted to engage in a notch 47 formed in the shear block 10a, 10b. The pins 43 and the teeth 46 allow the shear block 10a, 10b (magazine 8a, 8b) to be positioned relative to the nose 9.

[0059] As illustrated in particular on the figures 2 And 5, in the front part, the nose 9 includes a guide groove 48 extending longitudinally over each of the lateral parts of the nose 9, each of the grooves 48 being able to receive a lip 49 projecting from the probe 15a, 15b to allow the translational guidance of the latter on the nose 9 of the tool 1.

[0060] As illustrated on the figure 2 In its rear section, the nose 9 comprises a guide rail with two U-shaped edges 50, each bordering the nose 9 and facing outwards. The head 17 of the armature 16 of the probe assembly is mounted for translational movement on the rail of the nose 9. Bloc de cisaillement (also called a "connector")

[0061] One aspect of the invention relates to the shear block 10a, 10b of the magazine 8a, 8b. As a reminder, according to the embodiment illustrated in the figures, depending on the type of nails 6a, 6b to be pulled, the user mounts the magazine B / B 8a or the magazine M / B 8b on the nose 9 of the tool 1.

[0062] A shear block 10a, 10b is symmetrical along the plane S and delimits the lower part of the firing chamber 7. The shear block 10a, 10b includes a flat joint surface 51 with the nose 9. The shear block 10a, 10b includes a central feeding window 12 of the chamber 7, the window 12 extending along the axis X and opening into the firing chamber 7.

[0063] The shear block 10a, 10b further includes at least one guide track 52, 53 of the corresponding nail 6a, 6b, the track 52, 53 being opposite the support areas B / B 31a and M / B 31b of the nose 9. The guide track 52, 53 is formed by two guide notches 54a, 54b of the head 5a, 5b of the corresponding nail 6a, 6b, the notches 54a, 54b being opposite each other and partially bordering the window 12.

[0064] According to the embodiment illustrated in the figures, the window 12 is substantially T-shaped, and includes a rear opening 56 for the passage of the heads 5a, 5b of nails 6a, 6b into the firing chamber 7 and a front opening 57 for the passage of the shanks 25a, 25b of nails 6a, 6b into the firing chamber 7.

[0065] As illustrated on the figures 6 , 8 , 10 And 12The shear block 10a, 10b includes an inclined rear track 53 (comparable to a launching ramp), this rear track 53 rising from a threshold 58 located near the rear opening 56 to a crossing with a front track 52. The front track 52 is substantially straight and extends longitudinally from the crossing with the rear track 53 to the mouth 11 of the firing chamber 7.

[0066] As illustrated in particular on the figures 9 And 13The front notches 54a, 54b of the front track 52 are positioned in the firing chamber 7 and sized so that, during firing, the head 5a, 5b of the fired nail 6a, 6b is guided so that the latter (and in particular the head 5a, 5b) does not come into contact with the nail 6a, 6b located directly below it. The front notches 54 are longitudinal and symmetrical with respect to plane S. The front notches 54a, 54b are concave, and more precisely cylindrical. The front notches 54a, 54b have a radius approximately equal to that of the head 5a, 5b of the corresponding nail 6a, 6b.

[0067] As illustrated on the figures 7 And 9In connection with the shear block B / B 10a, the front notches 54a are each formed in a tongue 59 projecting from the flat surface 51 and extending along the X axis, the tongues 59 thus projecting inside the firing chamber 7. Each tongue 59 is able to engage in a recess 60 of complementary shape made in the blade 4. During firing, the rear track 53 allows, in particular, the head 5a of the nail B / B 6a to be placed in the upper part of the firing chamber 7. In the mounted position, the rear opening 56 is vertically opposite the support area M / B 31b and the rear track 53 is vertically opposite the connection area 40.

[0068] As illustrated on the figures 11 And 13 , in connection with the shear block M / B 10b, the front notches 54b are each formed flush with the flat surface 51.

[0069] As illustrated on the figures 5 , 7 , 9 , 11 And13 , when the magazine 8a, 8b is mounted on the tool 1, the nose 9 and the shear block 10a, 10b are mounted in support along a joint plane P, the flat surfaces 36, 51 of the nose 9 and the shear block 10a, 10b being in contact.

[0070] Magazine 8a, 8b is held in position by a locking button (not visible). Reloads 26a, 26b of nails 6a, 6b are inserted into magazine 8a, 8b through a slot (not visible) in its lower section. A follower 61 raises the 26a, 26b reload after each shot, thus reloading chamber 7 after each shot.

[0071] As illustrated on the figure 6 Before being fired, the head 5a of the nail B / B 6a rests on the bearing area B / B 31a of the nose 9, and the shank 25a, near the point 26a of the nail B / B 6a, rests on the upper wall 35 of the nose 9 (or close to the upper wall 35). The nail B / B 6a is then inclined in the firing chamber 7 at approximately ten degrees relative to the longitudinal direction (eight degrees in the illustrated example).

[0072] Similarly, as illustrated on the figure 10 Before being fired, the head 5b of the M / B 6b nail rests on the M / B 31b bearing area of ​​the nose 9, and the shank 25b, near the point 26b of the M / B 6b nail, rests on the upper wall 35 of the nose 9 (or close to the upper wall 35). The M / B 6b nail is then inclined in the firing chamber 7 by a few degrees relative to the longitudinal direction (three degrees in the illustrated example). Lame

[0073] One aspect of the invention relates to the blade 4 of the tool 1. The blade 4 is configured to pull a nail B / B 6a and a nail M / B 6b. The blade 4 has a percussion surface 63 configured to strike the nails 6a, 6b placed in their respective locations 79a, 79b.

[0074] Blade 4 has a generally elongated shape and is symmetrical along plane S, blade 4 comprising: means for fixing to the moving part of the drive device 3, located at a first longitudinal end called the rear end 62; the percussion surface 63 of the heads 5a, 5b of nails B / B 6a and M / B 6b, the percussion surface 63 being located at a second longitudinal end called the front end 64 opposite the rear end 62; an elongated body 65 located between the rear end 62 and the front end 64, the body 65 being able to slide in the firing chamber 7 in which the nail 6a, 6b to be struck is located;

[0075] The body 65 further includes a longitudinal groove 39 suitable for receiving the rim 38 of the nose 9.

[0076] According to the embodiment illustrated in particular on the figures 14 et 15 , the means of fixing correspond in this case to a threaded stud 66 extending from the rear end 62 to a shoulder 67 made in a collar 68 separating the stud 66 from the body 65 of the blade 4.

[0077] The groove 39 extends longitudinally and is complementary in shape to the rim 38 of the nose 9, namely rectangular in cross-section. The groove 39 is centered with respect to said plane S, and opens both onto an upper face 69 of the blade 4 and is flush with the percussion surface 63.

[0078] The body 65 is laterally delimited by two concave sides 70 of complementary shape to the lateral edges 37 of the cavity 34. In cross-section, laterally, the blade 4 flares out from the upper face 69 to an inferior face 71 vertically opposite the upper face 69.

[0079] The body 65 comprises two longitudinal recesses 60 opposite the groove 39, each recess 60 being suitable for receiving a tongue 59 of the shear block B / B 10a. Each recess 60 is thus complementary in shape to a tongue 59 of the shear block 10a, namely substantially rectangular. Each recess 60 opens onto a flank 70, the lower face 71, and the striking face 63. The body 65 therefore presents a V-shaped profile in cross-section. Each recess 60 has a substantially horizontal upper edge 72 (perpendicular to plane S) and an inclined lateral edge 73 extending from the upper edge 72 towards plane S.

[0080] Near its front end 64, the body 65 includes a reduction in cross-section, and more specifically: two upper chamfers 74 arranged on either side of the groove 39, each chamfer 74 connecting the upper face 69 to the percussion surface 63; a lower chamfer 75 connecting the lower face 71 to the percussion surface 63; two convex cheeks 76 arranged on either side of the percussion surface 63, each cheek 76 connecting a flank 70 to the percussion surface 63.

[0081] The percussion surface 63 is flat and has a T-shaped profile ( figure 15 ).

[0082] The blade 4 further includes an upper fillet 77 for connecting the collar 68 to the upper face 69 of the body 65 and a lower fillet 78 for connecting the collar 68 to the lower face 71 of the body 65.

[0083] The blade 4 has mechanical properties that allow it to withstand repeated shots from B / B 6a and / or M / B 6b nails. The impact surface 63, in particular, has high resilience in order to maintain its geometric (and especially its flatness) and dimensional characteristics shot after shot.

[0084] As illustrated on the figures 6 à 9 During the firing of a B / B 6a nail, the striking face 63 of the blade 4 strikes the exposed portion of the head 5a of the B / B 6a nail (present in the firing chamber 7) in such a way that the blade 4 does not simultaneously drive two overlapping B / B 6a nails. Following the impact, the head 5a of the B / B 6a nail is recentered relative to the striking face 63 of the blade 4 via the rear track 53. This recentering allows the blade 4 to exert a thrust at the center of the head 5a of the B / B 6a nail when the latter is on the front track 52. The trajectory of the fired B / B 6a nail is then stabilized on the front track 52 so as to give the fired B / B 6a nail a substantially longitudinal trajectory upon exiting the muzzle 11, and in other words, a trajectory coinciding with the direction of the blade 4.

[0085] As illustrated on the figures 10 à 13During the firing of an M / B 6b nail, the striking face 63 of the blade 4 strikes the head 5a of the M / B 6b nail at its center. Following the impact, the trajectory of the M / B 6b nail is stabilized on the forward track 52 so as to give the fired M / B 6b nail a substantially longitudinal trajectory upon exiting the muzzle 11, and in other words, a trajectory coinciding with the direction of the blade 4.

[0086] The embodiment illustrated in the figures is in no way limiting; this fastening tool 1 could be used to drive staples, nails, pins, etc.

Claims

1. Percussion blade (4) of a fastener for a fastening tool (1), such as a nail gun (1), characterized in that said blade (4) is configured to drive a fastening element of a first type (6a) and at least one fastening element of a second type (6b) having dimensional and / or geometric characteristics different from those of said fastening element of the first type (6a), the blade (4) having a striking surface (63) configured to strike, in particular heads, said fastening elements (6a, 6b) placed respectively in locations (79a, 79b) distinct from a nose (9) of guide of said tool (1).

2. Blade (4) according to claim 1, characterized in thatIt has a general elongated shape and is symmetrical along a longitudinal plane (S), the blade (4) comprising: • means for attachment to a drive device (3), located at a first longitudinal end (62); • the percussion surface (63) of a head (5a, 5b) of said first type and second type (6a, 6b) fastening elements, said percussion surface (63) being located at a second longitudinal end (64) opposite to the first end (62); • an elongated body (65) located between the first end (62) and the second end (64), said body (65) being adapted to slide in a firing chamber (7) in which is said first type (6a) or second type (6b) fastening element to be struck; said body (65) comprising at least one longitudinal groove (39) adapted to receive a rim (38) of a nose (9) for guiding fastening elements of a fastening tool (1).

3. Blade (4) according to claim 2, characterized in thatthe groove (39) is centered with respect to said plane (S) and opens both onto a top face (69) and flush with the percussion surface (63) of the blade (4).

4. Blade (4) according to claim 2 or 3, characterized in that the blade (4) includes at least a first recess (60) opposite said groove (39), said recess (60) being suitable for receiving a tab (59) projecting from a shear block (10a) of a fastening tool (1).

5. Blade (4) according to claim 4, characterized in that said obviously (60) opens simultaneously onto a flank (70), an underside (71) and said percussion surface (63) of the blade (4).

6. Blade (4) according to claim 5, characterized in that said lower face (71) and said striking surface (63) are connected via at least one lower chamfer (75).

7. Blade (4) according to any one of claims 4 to 6, characterized in thatthe blade (4) includes a second obvious (60) symmetric to the said first obvious (60) along the said plane (S).

8. Blade (4) according to any one of claims 3 to 7, characterized in that said upper face (69) and said striking surface (63) are connected via at least one upper chamfer (74).

9. Fixing tool (1), comprising a blade (4) according to any one of the preceding claims.

10. Fixing tool (1) according to claim 9, characterized in that• the nose (9) delimits at least in part a firing chamber (7), said nose (9) comprising a first support zone (31a) capable of cooperating with a head (5a) of said first type fixing element (6a) for the purpose of its positioning before firing, and at least a second support zone (31b) distant from said first zone (31a) and capable of cooperating with a head (5b) of said second type fixing element (6b) for the purpose of its positioning before firing; • the blade (4) is movable in translation relative to said nose (9) along an axis (X), said blade (4) being capable of striking a head (5a, 5b) of said first type (6a) and second type (6b) fixing elements.

11. Fixing tool (1) according to claim 10, characterized in thatit includes a magazine (8a, 8b) comprising a shear block (10a, 10b) mounted to rest on the nose (9) according to a joint plane (P), said shear block (10a, 10b) comprising at least one guide track (52, 53) of said first type fastening element (6a) and / or said second type fastening element (6b), said track (52, 53) being opposite said first and second bearing areas (31a, 31b).

12. Fixing tool (1) according to claim 11, characterized in that said shear block (10a, 10b) includes a central feed window (12) of said chamber (7), said window (12) extending along the axis (X) and opening into said chamber (7).

13. Fixing tool (1) according to claim 12, characterized in thatthe guide track (52, 53) is formed by two guide notches (54a, 54b) for said head (5a) of the first type fastener (6a) and / or of said head (5b) of the second type fastener (6b), said notches (54a, 54b) being opposite each other and bordering at least in part said window (12).

14. Fixing tool (1) according to any one of claims 11 to 13, characterized in that said guide track (52, 53) protrudes inside said chamber (7) relative to said joint plane (P).

15. Fixing tool (1) according to any one of claims 10 to 14, characterized in that the blade (24) includes a groove (39) extending along said axis (X) and being suitable for receiving a rim (38) of the nose (9).

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