FR2545402A1 - - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A TOOL FOR PROPELLING FASTENING ELEMENTS, SUCH AS NAILS, INCLUDING AN EXPLOSIVE POWDERED CARTRIDGE AS A PROPULSION MEANS. ACCORDING TO THE INVENTION, THIS TOOL IS CHARACTERIZED: A. BY PERFECTED GAS EXHAUST CHANNELS TO EVACUATE HOT COMBUSTION GAS FROM THE INSIDE OF THE TOOL; B. BY AN PERFECTED RELAXATION DEVICE 700 BOTH SIMPLE AND RELIABLE AND WHICH CAN BE EASILY DISASSEMBLED AND BY C. AN ADVANCED CARTRIDGE ADVANCE OR DRIVE MECHANISM 800. THE INVENTION ALSO INCLUDES A DETACHABLE FIXED EXTENSION TO THE TOOL AND WHICH HAS AN ORIGINAL MECHANISM TO ACTUATE THE TOOL FROM A REMOTE.

Description

The present invention relates, in general, to the tools

  propelling fasteners, which will be hereafter referred to as nailing tools and more particularly to tools of this kind

  operated by explosive cartridges containing powder.

  Nailer tools are universally known tools in the technical field considered These tools are generally divided into two major classes, depending on the source of energy generating the propulsion The first class of tools, sometimes called nailing tools to actuation By fluid, relies on the use of pressurized fluids (eg, air) to produce the propulsion energy. Examples of such tools are found in the following US patents: 3,952,398, 4,040,554, 4 122,904, 4,196,833 and 4,346,831 The second class of tools, sometimes referred to as nailing tools powered by explosive powder cartridges, is based on the use of explosive powder cartridges to produce propulsion energy. such tools in the following US patents: 3,168,744, 3,499,590, 3,552,625,

3,554,425, 3,565,313 and 3,743,159.

  Unfortunately, in the tools nails with explosive cartridge

  existing, of the type of those adapted to receive a band of car-

  In general, the construction of these tools tends to be complicated, so that they are relatively expensive to manufacture, rather difficult to assemble and are subject to mechanical failures. Instead, in a large number of explosive cartridge nailing tools, the exhaust channels used to release the hot combustion gases from the inside of the tools are unsuitable for the required operation; As a result, these tools are relatively noisy, are subject to considerable interference, have poor energy efficiency and / or often tend to jam as a result of the accumulation of burnt powder inside the tool. moreover, none of the existing explosive cartridge nailing tools is capable of using what is known as a "red" charge cartridge, also known in the industry as a "power level cartridge" "(Power Level 5), or more simply cartridge 'ln' 5", with a light fastener (for example, with a nail 12.7 mm long) and are still considered "slow" tools A on this subject, it should be noted that a "slow" tool is a tool whose projectile has a maximum speed of 91.5 m / s measured at about 1.8 m from the mouth of the barrel Another problem that arises with a lot of explosive cartridge nailing tools is that they are built in such a way that It is difficult to dismantle them in the field for maintenance purposes. Another limitation common to conventional design tools is that they can not easily be adapted to propel fasteners of different types and sizes. similarly, the existing explosive cartridge nailing tools are generally not adapted to be easily mounted on an extension or similar assemblies of extensions available because these tools are not convenient to handle or

  may be accidentally fired.

  In addition to the aforementioned problems that are common to a large number of existing tools, there is at least one such tool that also uses a relatively complicated relaxation device, so that

  the aforementioned problems of manufacturing cost, difficulty in assembling

  In addition, at least one existing explosive cartridge nailer tool uses, in its mechanism for advancing the cartridge, a cam device that tends to wear out excessively. , which requires increased maintenance or

  can lead to seizure of the tool.

  Accordingly, the main object of the present invention is the design of an explosive cartridge nailing tool which is specially adapted to eliminate the aforementioned drawbacks encountered in tools

of the prior art.

  More specifically, one of the aims of the present invention is to provide a store-type explosive cartridge-type nailing tool which is relatively inexpensive to manufacture, of a relatively easy assembly,

  reliable operation that does not stop.

  The object of the invention is also to provide an explosive cartridge nailing tool: which comprises improved exhaust channels for evacuating the hot combustion gases from the inside of the tool, so that it

  be quieter, less backward, energy efficient

  higher (and thus more powerful) and at least

25454 2

  tendency to clog up as a result of the accumulation of burnt powder residues inside the tool; who is able to use so-called "red" charge cartridges with lightweight fasteners, and can be considered a "slow" tool;

  easy to dismount in the field to facilitate

  yours; which can be easily adapted to the propulsion of fasteners of different types and sizes; which can be easily adapted to a raised extension to form a raised work package; and

  which has a relaxation device that is both simple, relatively

  inexpensive to manufacture, easy to assemble, reliable and not

  tible to cause a jamming of the tool.

  Finally, the invention proposes to provide a nail gun tool

  explosive powder gun which uses an improved cam device in its cartridge feed mechanism, and which is designed to reduce to a

  minimum cam wear, as well as maintenance and risk of jamming.

  The invention achieves the goals it has set for itself and others in

  installing an explosive powder cartridge nailer tool that presents the

  improvements mentioned below on the tools of the prior art.

  First, the present invention utilizes an expansion device that includes a release lever pivotally supported so that it can move toward and away from the firing mechanism of the tool, a torsion spring that resiliently biases the lever. release mechanism to move away from the firing mechanism, a detent, a trigger plunger connecting the trigger to the release lever, to cause the trigger to push the release lever in the desired direction to activate the mechanism

  when triggering the trigger Secondly, the present invention

  In the mechanism of advance of the cartridges, a cam having a

  upper surface rounded, but with a flat intermediate section.

  Third, the present invention utilizes a cylinder which has three raised cylindrical portions, the first portion being disposed near the rear, the second portion near the middle and the third portion near the front of the cylinder. The cylinder also has a rib longitudinal extending

  between the first and second cylindrical parts, this longitudinal rib

  dinal having, at the rear, a substantially widened portion The hole in the bottom of the cylinder, intended to receive a projecting portion of the cylinder of the stop mechanism of the tool, is located in this longitudinal rib, while the groove of the cylinder intended to receive the cam of the cartridge advance mechanism is located in the enlarged rear part of the rib The second cylindrical portion of the cylinder also has a plurality of ventilation holes to evacuate the gases from the inside to the outside of the cylinder.

  These ventilation holes form an acute angle with the longitudinal axis

  dinal of the cylinder and communicate with grooves provided in the outer surface of the second cylindrical portion The third cylindrical portion has two slots for directing the gas to the barrel of the tool, the latter being profiled to allow these gases out of the fourthly, the present invention uses a handguard that replaces the long conventional slot that is normally found in the bottom of known handguards by a short slot and a groove extending this slot, to limit premature escape of gas out of the tool In addition, the hand guard has several circumferential flats disposed on the outer surface of its cylindrical portion, to minimize the risk of seizure between the protègemain and the housing of the tool as a result of the accumulation of

  Powder residues burned in this area of the tool.

  Other features and advantages of the present invention

  come out of the following description, made solely for the purpose of

  nonlimiting example with reference to the accompanying drawings in which Figure 1 is a longitudinal sectional view, with some parts shown in side elevation and some other cutaway, of a powder nailer tool which is the preferred embodiment of the invention. the present invention; FIG. 2 is an exploded perspective view in section of

  parts of the tool housing and the feed advance mechanism.

  FIGS. 2A is a sectional view, with some parts cut away along the line 2A-2A of FIG. 2;

  FIG. 2B is a sectional view taken along the line 2 B-

  2 B of Figure 2; Fig. 3 is a perspective view of the barrel of the tool; Fig. 4 is a perspective view of the barrel of the tool; Fig. 4A is a longitudinal sectional view of the barrel of the tool; Figure 5 is a perspective view of the same cylinder seen from a different angle; Figure 6 is a perspective view, broken away, of the hand guard of the tool; Figure 7 is a perspective view of the percussion mechanism of the tool; Figure 8 is a perspective view, broken away, of the stop mechanism of the cylinder of the tool; Figure 9 is an exploded perspective view, with cutouts of the bolt assembly of the tool; FIG. 10 is an exploded perspective view, partially in section, of the firing mechanism of the tool

  FIG. 11 is a front view of a carrier support strip.

  keys used in conjunction with the tool; Figure 12 is a side view showing several cartridges placed in the same band; Fig. 13 is a cross-sectional view taken along the line 1313 of Fig. 1, showing parts of the tool housing of the breechblock assembly, the cartridge feed mechanism and the detent mechanism; Figure 14 is an exploded perspective view of a fastener propelled by the tool; Figures 15A and 15B are longitudinal sectional views, in which some parts are shown in side elevation and some others broken away, an extension adapted to be fitted on the tool; Figure 16 is a plan view of the trigger actuator provided in this extension; and FIG. 17 is an exploded view of the handle and the device

cams provided in this extension.

  Referring first to FIG. 1, there can be seen an explosive cartridge nailing tool, constituting a preferred embodiment of the present invention. This tool comprises, in general, a body composed in part of a housing 100 and a rear cover 141, a barrel-cylinder assembly 200, a striking mechanism 300, a cylinder stop mechanism 400, a cylinder block assembly 500, a mechanism of setting

  600, an expansion device 700 and a cartridge advance mechanism.

800 meters.

  Referring now to FIGS. 1, 2, 2A and 2B, it can be seen that the housing 100 has a front bore 104, a frontal counter-hole 106

  which communicates with the frontal bore 104 and forms a shoulder 108 at its ridge.

  with it, a rear bore 110, a rear counterboring 112 which communicates with the rear bore 110, a hollow handle 113 and an irregularly shaped transverse chamber 116 which extends from the upper face of the tool to the lower end of the handle 113, intercepting and communicating with the front bore 104 The handle 113 has at the rear an elongate opening 111 which communicates with the chamber 116 and the housing 100 present in its face lower, a recess opening 117 which is an extension of the opening 111 A transverse partition 118 separates the rear bore 110 from the upper part of the chamber 116 The partition 118 is pierced with openings 120, 121, 122 and 123 which extend between the rear bore 110 and

  the chamber 116 The housing 100 also has a groove or a longitudinal channel

  tudinal 124 in the bottom wall of the front bore 104, as well as two parallel vertical channels 125 (see also Figure 13) extending into

  the inner faces of the opposite side walls of the handle 113, a first

  first threaded bore 126 opening into the front bore 104, as well as a second, third and fourth bores 128, 130 and 134 opening into the frontal counterbore 106 The bores 130 and 134 are threaded, while

  the piercing 128 is not pierced 126, 128, 130 and 134 extend per-

  perpendicularly to the front bore 104 and the counterboring 106 The holes 126, 128 and 130 all open into an elliptical recess 132 formed in

  the lower face of the housing 100 The vertical drilling 134 comprises a counter

  Another tapped hole 137 opens at right angles into the counterbore.

  The drilling 137 has a counterbore 138 (FIG. 1). Another threaded hole 139 formed in the lower end of the handle 113 opens into the chamber 116. The piercing 139 has a conical counter-hole (FIG. threaded bore 175 (FIG. 2 B) passes through the casing 100 and

  opens into the front bore 104.

  With reference to FIG. 1, it can be seen that, at the casing 100, a rear cover 141 and a resilient butt 142 are fixed. The rear cover 141 is attached to the posterior end of the carter 100 so as to form the bore 110. my-

  the cover 141 on the housing 100 is provided by a bayonet coupling.

  More specifically, counter-drilling 112 contains several segments or staves

  in relief and mutually spaced 115 (Figure 2) which cooperate with segments

  similar spaced apart portions 154 (FIG. 10) located on the inner end of the

  cover 141, so that the cover and the housing can be coupled and deactivated.

  coupled by a simple rotation of the cover relative to the housing The inner cylindrical surface 143 of the cover coincides with the rear bore 110 to form a single cylindrical chamber whose one end is closed by the end wall of the cover 141 and the The cover 141 is releasably locked in this position by a locking screw 144 which is inserted into a threaded bore 137 and projects into a

locking hole 119 of the cover 141.

  A butt liner 142 cooperates with the handle 113 of the housing to form a handle or a profiled butt that the user of the tool can completely grip to have the tool well in hand The lining 142 has, at its upper end, a tab 150 which covers a lip 147 of the underside of the casing The seal 142 closes the openings 117 and 111 The seal 142 has a central rib 151 which extends into the opening 111 and engages with two ribs 152 disposed on the opposite face of

  the handle 113, which prevents any relative lateral movement of the liner.

  The latter is immobilized by a screw 146 which engages in a hole 139 and

  also in a threaded hole 145 provided in the lower end of the housing.

  niture. The barrel-cylinder assembly 200 is shown in detail on the

  FIGS. 1 and 3 to 6 The barrel-cylinder assembly 200 generally comprises

  a gun 202 (Figure 3), a cylinder 204 (Figure 4, 4a and 5), a collar

  206 (Figure 1) and a handguard 208 (Figure 6).

  Referring now to FIGS. 1 and 3, it can be seen that the barrel 202 has, along its entire length, a coaxial bore 210 having a circular cross-section. The rear end of the bore 210 comprises a

  Outwardly, the barrel 202 has a pre-opening

  first cylindrical region 214 having two diametrically opposed diametrically opposed lips or mating platens 216, a second larger diameter cylindrical region 218, and a third region 219 having a smaller diameter than the first region and having six flats. identical 226

  giving it a hexagonal cross-section The second region 218

  a first pair of diametrically opposed longitudinal grooves 220, a second pair of diametrically opposed longitudinal grooves 222 and a diametrically opposed pair of circumferential grooves 224 which

  open into grooves 220 and 222 It should be noted that only one of the reasons

  220, 222 and 224 of each pair can be seen in Figure 3.

  It should be noted that the grooves 220 extend beyond the opposite ends of the cylindrical region 218 into the first cylindrical region 214 and

  the third hexagonal region 219.

  Referring now to FIGS. 1, 4, 4 a and 5, it can be seen that the cylinder 204 has a small-diameter tubular extension 228 at its rear and that its outer surface, in the cylindrical assembly, is disengaged in

  two zones 229 and 230 so as to form three spaced ranges 231, 232 and 233.

  The cylinder 204 is traversed by a coaxial bore 234 which has a

  first section 235 of small diameter starting at the end of the tubular extension 228, a second section 236 having a slightly smaller diameter

  and extending over the remainder of the tubular extension 228, a trench section

  5, a section 238 having a relatively large diameter which extends over more than half the length of the bore 234, two sections 238 A and 239 having an even larger diameter, a frustoconical shoulder 240 and a counterbore frontal drilling 241 The recess 229 of the outer surface

  does not extend around the cylinder 204, resulting in a longitudinal rib

  242 which extends between the bearing surfaces 231 and 232 and has a rear section 244 of substantially larger width The cylinder 204 is also

  pierced by an elongate opening 246 extending along the rib 242 and

  The rib 242 also has two narrow aligned grooves 247 and 248. Another wider groove 249 extends along the rib 242 and the span 231. The cylinder 204 also has a plurality of circular vent holes 250. which extend radially and open into the central bore 234 The holes 250 are inclined with respect to the central axis of the cylinder, as can be seen clearly in FIG.

  232 has a plurality of slots or longitudinal grooves 252 which

  communicate with the holes 250, at one end, and which open to their other

  end in open or stripped areas 230.

  Continuing to refer to FIGS. 4, 4 A and 5, note

  front span 233 has two diametrically opposed slots 256.

  In addition, the counterbore 241 is disengaged in two zones aligned with the slots 256, as indicated at 258 and the section 239 of the bore is recessed in two diametrically opposed locations, offset by 900 from the recesses 258, as indicated. at 261 The small diameter tubular extension 228 serves as a cartridge holder and, for this purpose, its end is

  split to form a plurality of fingers 254.

  Referring now to FIG. 1, it can be seen that an elastic impact collar 206 is disposed in the cylinder 204.

  cylindrical section and comprises a peripheral rib 260 The outer diameter

  rib 260 is calculated so that it fits tightly into the

  section 239 of the cylinder bore.

  Referring now to FIGS. 6, it will be noted that the protector 208 comprises a cylindrical portion 262 whose outer surface has several longitudinal plates 272, and one end 263 of which has a frustoconical outer surface. The inner surface of the handguard is staggered in sense of its length so as to define two shoulders 264 and 265

  (Figure 1) Two pins 266 are welded to the inner surface of the guard.

  The cylindrical portion 262 is slotted axially over a short distance from its end, and is integrally molded into diametrically opposed points.

  rear, as indicated in 267, and it also has, in its outer surface,

  a shallow axial groove 268 which is aligned with the slot 267

and which opens into it.

  The percussion mechanism 300 is shown in detail in Figures 1 and 7 It comprises a striker 302 formed of a head 304 and a rod 306 connected thereto by an enlarged portion 307 Two metal rings 308 are housed in two peripheral grooves 310 formed in the head 304 As seen in Figure 7, the head 304 also has, at the rear, a blind axial bore 312 which acts as a combustion chamber The mechanism of

  percussion 300 is slidably received in the cylinder 204 in the manner

  shown in Figure 1, so that its head 304 is located in the

  The rings 308 provide close sliding contact with the inner surface of the cylinder 204. The rod 306 passes through the impact collar 206. The rod 306 is undersized with respect to the inside diameter of the collar 206. linkage 307 of the striker is

  dimensioned to fit snugly in the impact collar.

  The striker shaft 306 is long enough to fit snugly

  in the bore 210 of the barrel 202.

  The barrel 202, the cylinder 204, the impact collar 206 and the

  handguard 208 are all designed to be easily and quickly assembled, so as to jointly form the barrel-cylinder assembly 200, associated with the percussion mechanism 300, as shown in Figure 1 The first operation is to introduce the firing pin 302 in the cylinder 204,

  so that its head 304 is housed in the section 238 of the bore.

  Then, the impact collar 206 is introduced into the cylinder 204 so that its peripheral rib 260 comes into contact with the surface delimiting the section 239 of the bore of the cylinder 204. Then, the barrel 202 is inserted into the cylinder 204. so that the impact collar 206 advances in the frustoconical counterboring 212 of the barrel When the barrel is inserted, the lips 216 must first be aligned with the recesses 258, so that they can be advanced axially in contact with the shoulder 270 formed by the section 239 of the bore and the counter-drilling 241 Then, the barrel is rotated 900, allowing it to move far enough in the cylinder so that the lips 216 fit in the recesses 261 against the shoulder 240 At this point, the barrel is immobilized in-rotation

  relative to the cylinder, while keeping the possibility of being displaced axially-

  In this respect, the barrel and the cylinder can be detached by being separated from each other until the lips 216 have been placed in the boring 241, after which one can turn the barrel 90 to align the lips 216 with the clearances 258, and thus be able to pull the barrel out of the cylinder After the barrel 202 has been installed in the cylinder 204, it is connected to the handguard 208 by means

  a bayonet coupling described below.

  For this purpose, a compression spring 269 (FIG. 1) is first provided in the handguard 208 until it is imprisoned between

  the shoulder 265 and the pins 266 of the front end of the protègemain.

  Then, the barrel 202, with its hex end, is introduced into the handguard 208, so that the anterior end of the second cylindrical region 218 of the barrel is stopped by the pins 266. align the grooves 220 of the barrel with the pins 266 of the handguard Then, by pushing the cylinder and the handguard towards each other, the barrel is brought forward in the handguard, to the against the action of the spring 269, and far enough to align the pins 266 with the grooves 224, after which the hand guard is rotated to move the pins 266 in the grooves 222 After that, release the hand guard and the barrel, so that the spring 269 causes telescopic movement of the barrel and the cylinder into one another, to the extent permitted by the relative movement of the pins 266 in the grooves 222, with the result that the barrel is locked on the handguard by the pins 266 housed in the grooves 222, while the spring 269 forces the barrel to deviate axially from the handguard In this situation, can be removed and separate the cylinder 204 and the percussion mechanism to which it is associated with the locked hand proget and barrel, pulling the barrel axially so as to spread it far enough from the hand guard so that the lips 216 are aligned with the counterboring 241 and then rotating the barrel a quarter of a turn so that the lips 216 are aligned with the recesses 258,

  and finally pulling the cylinder and the handguard in opposite directions.

  When the barrel-cylinder assembly 200 has been assembled as described above, the barrel 202 is immobilized in rotation relative to the hand guard 208, while the hand guard 208 and the barrel 202 can be moved one by relative to the other in a telescopic movement against the force of the spring 269, and that the hexagonal end of the barrel 202 extends to the outside

  through the frustoconical frontal end of the handguard 208.

  The barrel-cylinder assembly 200 and the percussion mechanism 300 are received in the casing 100 in the manner shown in FIG.

  specifically, with reference to FIG. 2, it can be seen that the cannula assembly 200 (including the percussion mechanism 300) is positively

  the inside of the housing so that the recessed cylindrical portion 229 of the cylinder 204 is slidably disposed partially in the bore 104 and partially in the counterboring 106 and that the cylindrical portion 262 of the handguard

  208 is slidably disposed in the counterbore 106, the end portion

  front half of the handguard 208 and the hexagonal section 219 of the barrel 202

  extending outward beyond the front end of the casing 100 The di-

  outer diameter of the cylindrical portion 262 is such that the hand guard is tightly fitted to slide in the counter-drilling 106 of the housing, the plates 272 serving to delimit several passages between the protègemain and the adjacent inner surface of the housing, to allow gas escaping from the back of the handguard When setting up the barrel-cylinder assembly

  200 in the housing 100, it shall be ensured that the slot 267 of the guard

  208, the grooves 220 of the barrel 202 and the elongated opening 246 and the aligned slots 256 of the cylinder 204 are in alignment with the vertical bores 126, 128, 130 and 134 of the housing, that the groove 249 of the cylinder 204 is aligned with the channel 124 of the housing and that the grooves 247 and 248 of the

  cylinder 204 are aligned with the tapped hole 175 of the housing (Figure 2 B).

  The installation of the barrel-cylinder assembly 200 in the casing requires that the stop mechanism 400 of the cylinder be operated (FIGS. 1 and 8).

  which serves to limit the amplitude of the back-and-forth movement of the barrel-

cylinder in the housing 100.

  Looking now at Figures 1 and 8, we can see that this mechanism

  The stopper 400 of the cylinder essentially comprises a cylindrical body 402 having an elliptical flange 403 which fits into the elliptical opening 132 of the casing 100, a cylinder stop pin 404 slidably disposed in the body 402 and including at its outer end, an enlarged button 406, and a compression spring 408 The cylinder stop pin 404 is formed

  so as to have, at its apex, an angular tongue 410, two shoulder-

  418, a spring 408 is trapped between the edge 412 and the button 406 This spring urges the locking pin so that the tongue 410 is placed

  projecting beyond the upper end of the body 402.

  The body 402 of the stop mechanism is mounted in the bore 128 of the housing 100, its elliptical flange 403 being received in the recess 132 The cylinder stop mechanism 400 is held in place by screws 416 and 418 which are screwed respectively into the threaded bores 126 and 130 of the casing 100. When the mechanism is thus mounted, the tongue 410 of the locking pin 404 rises sufficiently far in the counter-bending 106 of the casing to prevent the insertion of the cylinder 204 into the casing. As a result, the

  setting up the barrel-cylinder assembly 200 in the casing requires that the opening

  The extended length 246 of the cylinder and the slot 267 of the handguard are aligned with the locking pin 404 and the latter has been retracted sufficiently to allow the cylinder to be inserted far enough so that the rear end of its opening 244 is beyond the locking pin 404 The tongue 410 is narrow enough to fit into the cylinder opening 246, but its shoulders 411 are just wide enough not to fit.

  in opening 246, without being too wide to fit

  not in the slot 267 of the handguard As a result, when the tab

  410 is held in extension by the spring 408, the stroke of the barrel-

  cylinder 200, relative to the housing 100, is limited by the length of the opening 246 of the cylinder 204 by pulling the button 406 with sufficient force to overcome

  the action of the spring 408, the tongue 410 may be entirely out of the

  246 of the cylinder 204, thus releasing the barrel-cylinder assembly 200, which can then be removed by removing it by the front end of the housing 100. It is conceivable that the cooperation of the tongue 410 of the stop mechanism 400 with the elongated opening 246 of the cylinder 204 limits both the longitudinal stroke and the rotation of the barrel-cylinder assembly 200 relative to the casing 100 This same interaction also ensures the alignment of the groove

  249 of the cylinder with the horizontal channel 124 of the housing, the alignment of

  247 and 248 of the cylinder with the housing bore 175 and the alignment of the

  groove 268 of the hand guard with a screw 420 which is received in the tapping

  raud 134 and which is just long enough to advance in the groove 268.

  This cooperation of the groove 268 with the screw 420 ensures that the groove 267 of the hand guard 208 will always be aligned with and ready to receive the tongue.

  410 of the stop mechanism 400 of the cylinder.

  A trimmer 425 is disposed in the threaded hole 175 of the casing (FIG. 2B) in order to ensure limited braking of the movement of the cylinder assembly 200 in the casing 100. This limited braking is sufficient to maintain the barrel-cylinder assembly 200 practically during the normal handling of the tool, for example while being transported to the

  without being sufficient to impede the movement of

  The adjuster 425 comprises a threaded housing 428 which is screwed into the bore 175, a pin 426 slidably mounted in a housing bore, a spring 427 which forces the pin to protrude into the bore. bore 104 of housing 100 and a threaded member 429 mounted in the housing to hold the spring 427. Normally, the leading end of pin 426 is received in either of the grooves 247 and 248 of the cylinder, or comes to apply against the part of the surface

  outer cylinder which extends between the grooves 247 and 248.

  A breech block assembly 500 is disposed in the upper portion

  In view of FIGS. 1, 9 and 13, it will be seen that this breech block assembly 500 essentially comprises a block 502 which has a substantially rectangular horizontal section, two spring cups 504, two compression springs 506, two 508 steel balls, a 510 firing pin casing, two 512 center dowels, a dowel pin

  firing 514 and a compression spring 516 for this pin L'enve-

  loppe 510 of the firing pin is disposed in a rear extension 153 of the chamber 116 In the breechblock 502, is hollowed a cavity or an inner chamber 518 which passes therethrough, from top to bottom, as shown in Figures 1, 9 and 13 The breech block 502 has two slots facing each other 520 which form lateral extensions

  of the cavity 518 The front face of the breech block is pierced by an opening

  519 (FIGS. 9 and 13) which is large enough to accommodate the prolongation

  228 cartridge 204 to support the cartridge Two horizontal drill holes

  Parallel zones 522 and corresponding counterbores 524 extend from one side of breechblock 502, inside thereof and open into slots 520. The inner ends of holes 522 are tapered in spherical form until they have a groove. slightly smaller than the diameter of the balls 508 The balls 508 and the springs 506 are housed in the bores 522 and the cups 504 are fixed in the counterbores 524, as shown in FIGS. 9 and 13, so that the balls 508 partially protruding into

  the slots 520 under the action of the springs 506.

  The breech block 502 also has a tapered bore 526 and two parallel bores 528 which pass through its rear face to the cavity 518. The bores 528 are aligned with two other bores 530 of the casing 510 of the firing pin so that receiving the centering studs 512 extending between the block 502 and the casing 510 of the firing pin (FIGS. 1 and 9) The casing 510 also comprises a bore 532 and a counterboring 534 which, when the casing 510 is in contact with the breech block 502, together with the tapered bore 526 define a chamber for the housing of the firing pin 514 and the compression spring 516 of

  the latter Normally, the firing pin 514 is entirely

  in the aforementioned chamber and, because of the action of spring 516,

  It does not penetrate the cavity 518 of the breech block 502.

  as the force of the spring 516, the firing pin can be made to penetrate by its pointed end, inside the cavity 518 The breech block 502 also has, at the rear, two tapped holes 535 and 536 and a bore 537 which passes therethrough, parallel to the bores 528. The block assembly 500 block is held in place in the chamber 116 by means of two screws (not shown) which pass through the openings 120 and 121 of the partition 118 and are screwed into the holes 535 and 536 of the block 502 When the assembly of the cylinder block 500 is thus fixed in the housing, the vertical slots facing the 520 block 502 are aligned with the

  vertical channels 125 of the housing 100 (FIG. 13) and, in addition, the axis of the governor

  firing pin 514 is misaligned with respect to the axis of the extension 228 of the cartridge holder of the cylinder 204 At the same time, the drilling 532 and the counter-drilling 534 of the envelope 510 of the firing pin are aligned with the openings 122 of the wall 118 of the housing 100, while the bore 537 of the breech block 502 is aligned with the opening 123 of the partition 118

crankcase.

  Looking now at Figures 1 and 10, we see that the mechanism

  The firing pin 600 includes, in general, a casing 602 for the firing pin actuator, three compression springs 604, 610 and 618, a latch or detent 606, two retaining pins 607, an actuator 608 for the firing pin, a spring retaining sleeve 612 provided with an inner front flange 613 and an outer rear flange b 15, a retaining ring 614 and a washer 616 The firing mechanism 600 is disposed in the chamber located in the rear portion of the housing 100, between the partition 118 and the rear cover 141 The sleeve 612 is locked on the cover 141 by the retaining ring 614 which is received in a internal groove of the cover 141 The spring 618 forces the washer 616 to move away from the cover 141,

  applying it against the flange 613 of the retaining sleeve 612 of the spring.

  The spring 610 is placed around it and against the outer surface of the sleeve 612 and extends into an internal groove 619 of the casing 602. The spring 610 forces the casing 602 of the actuator of the firing pin to be closed. 'rule

  rear cover 141 and to be applied against the partition 118 of the housing.

  The actuator 608 of the firing pin is arranged so that its rear end enters the retaining sleeve 612 and its

  shoulder 611 can be applied against the washer 616, while its end

  the anterior portion protrudes through a central opening 620 in the housing.

  actuator loppe 602 actuator 608 of firing pin pre-

  two opposing flat faces 621, each of which is formed to

  define a flat edge 622 (only one of which is visible) presenting in elevation

  a notch, as indicated in 624. The actuator 608 of the pin of

  The firing is contoured to fit snugly in an opening.

  This latch is mounted in a transverse opening 627 of the envelope 602 and is urged by the compression spring 604 which is housed in a depression 629 constituting an extension of the opening 627. latch 606 is held in place in opening 627 by the two retaining pins 607 which intercept shoulders 628 of the latch The shoulders 605 of latch 606 are designed to slide along ridges 622 and notches 624 Notches are arranged

  so that when they come into contact with the shoulders 605, the end

  the front of the actuator protrudes slightly beyond the

  The lower face of the envelope 602 also has a recess, as indicated at 631, to receive the rear extension 720 of a release lever 706, as shown in FIG.

  this will be described in more detail below. The firing mechanism com-

  also takes an axial push rod 630 which is attached to the casing 602 of the firing pin and passes through the opening 123 of the partition 118 and the bore 537 of the breech block 502, as will be described further in

detail thereafter.

  The length of the ridges 622 is calculated to allow the actuator 608 of the firing pin to be propelled forward by the

  spring 618 sufficiently so that its frontal tip 632 protrudes through the opening

  620 sufficiently far to meet and propel the firing pin 514 forward, so as to ignite a cartowlxx disposed in the bracket 228 When the envelope 602 of the actuator is pushed back to the hood 141, against the force of the spring 610, the actuator 608 of the firing pin is also driven backwards, against the force of the spring 618, because the notches 624 of the actuator 608 are in contact with the shoulders 605 of the latch If, while the casing 602 of the actuator compresses the spring 610, the latch 606 is forced to go up inside the casing 602, to the against the force of the spring 604, so as to disengage the shoulders 605 from the notches 624, the actuator 608 is located

  released and the spring 618 propels it forward with a high force.

  The firing pin 600 is specially adapted for this forward movement of the actuator 608 to cause the leading end 632 thereof to pass through the opening 122 of the partition 118 to engage the firing pin 514 and propel it forward so that its tip

  penetrates into the inner cavity 518 of the breech block 502.

  Continuing to observe Figures 1 and 10, it will be noted that the casing 602 of the actuator is adapted to move rearwardly within its chamber in the housing 100, because it is integral with

  push rod 630 This rod, which is fixed to the front face of the casing

  602 of the actuator, is slidably accommodated in the opening 123 of the partition 118 and in the bore 537 of the breech block 502 and extends into the bore 104 so as to come into contact with the rear wall 251 of the cylinder 204 (see Figure ia) The push rod 630 is dimensioned such that when the casing 602 of the actuator is held forward by the

  spring 610 in contact with the partition 118 of the housing 100, as it is normal

  in the absence of any external force, it can meet the wall 251 of the cylinder 204 and, in this case, the fingers 254 provided at the end of the extension 228 which supports the cartridge, advance slightly inside of the cavity 518 of the breech block, while the tongue 410 of the stop mechanism 400 of the cylinder is disposed between the two ends of the opening 246 of the bottom of the cylinder. At the same time, the push rod 630 is dimensioned so that, if the protruding hexagonal portion of the barrel 202 were to be pushed back within the nailing tool with sufficient force to overcome the action of the spring 610, the actuator casing 602 could be pushed far enough toward rearward in its chamber to allow the actuator 608 to positively strike the firing pin 514 in the case where the latch 606 would then be returned to its unlocking position,

  as indicated above.

  The latch 606 of the firing mechanism is designed to be movable upwardly, against the force of the spring 604, in its

  unlocking position by the detent device 700 Now considering

  1 and 13, it can be seen that the expansion device 700 generally comprises a detent 702, an expansion plunger 704, an unlocking lever 706, a torsion spring 708, a first pivot pin 710 and a pin 712 The opposite ends of the pins 710 and 712 are anchored in the side walls of the housing 100 and pass through the bottom opening 117 (Figure 2) which is located directly behind and communicates with

  the chamber 116 The lever 706 is pivotally mounted on the pivot pin 710.

  The torsion spring 708 is mounted on the pivot pin 710, one of its

  ends being blocked by the pivot pin 712 and the other by the lever 706.

  The spring 708 urges the lever 706 counterclockwise (according to FIG. 1) so as to move it away from the envelope 602.

  the actuator The trigger 702 is slidably mounted in a rectangular opening

  703 of the front wall of the handle 113 (Figure 2) The pusher 704 of the trigger has rounded ends, one of which is disposed in a rounded depression formed in the rear extension 711 of the trigger 702,

  and the other is housed in a rounded depression of the lever 706.

  Evening 704 connects the trigger 702 to the release lever 706, so that the trigger 702 is normally biased to its extended position (Figure 1) under the action of the torsion spring 708 The advanced position or extension of the expansion is determined by the contact of a portion thereof with a shoulder 715 formed in the housing 100 (Figure 2) When the trigger 702 is pushed back with sufficient force to overcome the resistance of the torsion spring 708 the unlocking lever 706 pivots upwardly against the casing 602 of the actuator. The various components are suitably sized so that when the barrel-cylinder assembly 200 is pushed back into the casing 100 as far as possible. enabled by the contact of the anterior end of the opening 246 of the cylinder with the locking tongue 410, thus pushing the envelope 602 of the actuator back into its chamber, the latch 606 of the actuator is uve placed directly above the extension 720 of the release lever 706, so that if, at this point, the trigger is pulled back, the lever 706 will rise far enough for its extension 720 to meet the latch 606 and raises it in its unlocking position, thus releasing the actuator 608. As seen in Figures 1 and 13, the transverse rear extension 711 of the trigger 702 is coupled to the trigger by two spaced parallel links 713 which extend through the chamber 116, near the parallel vertical channels 125 The detent 702, its rear extension 711,

  and its links 713 form an opening which can receive a band of car-

  rifle powder keys, as described below.

Such a strip of cartridges 802 is shown in Figures 11 and 12. This strip has a symmetrical configuration, and has a number of uniformly spaced indexing notches 804 along its two side edges. number of openings

  units 808, each of which is in the form of a cross, in order to receive cartridges

  Figure 810, as shown. The four slots defining each opening 808 are sized to receive the fingers 254 of the cylinder 204, so that these fingers can be applied against the underside of the edge of a cartridge, while the end Conical anterior of this one

  in the extension 228 of the cylinder.

  The advance mechanism of the cartridges 800 serves to advance a strip 802 of cartridges 810 so that each cartridge comes in turn to be placed in the firing position The advance mechanism 800, visible in Figures 1, 2 and 13 , comprises, in general, a belt feed cam 812, a pivot 814, a pawl 816 and a spring 818 The pivot 814 is fixed in a bore 815 which cuts the channel 124 of the housing 100 The cam 812 is housed in the channel 124 of the housing and pivots about the pivot 814 The cam 812 has an upper cam surface 820 of generally rounded shape, with a flat intermediate section 821 The surface 820 of the cam is adapted to be housed in the groove 249 of the The rear end of the cam 812 has a finger 822 which extends into a slot 819 (FIG. 13) of the breech block 502 in a position of contact with the underside of the pawl 816 when the cylinder 204 is moving. according to a movement of va-et- comes inside the casing 100, it pivots the cam 812 around the pivot 814 and thus raises and lowers its finger 822 alternatively. As can be seen in FIGS. 9 and 13, the breech block 502 comprises a hanging tongue 817 and also has, on one side, a narrow slot 819 (Figure 13) which extends downwardly around the outer face of the tongue 817 The slot 819 communicates, through an elongated vertical opening, with one of the guide grooves 520

  The ratchet 816 is housed in the slot 819.

  The upper ratchet 816 ends with a pointed finger 824 which extends through the elongate vertical opening to engage the groove 520 when in its raised position, i.e., in the position shown in FIG. The upper end of the spring 818 is housed in a depression of the breech block 502, while its lower end bears against an inclined upper edge of the catch 816. The spring 818 biases the catch (and the cam follower 822) towards When the cylinder is extended, the finger 822 occupies a lower position than that shown in the figures

  1 and 13 and it is the same for the pawl 816 The cam follower 822 applies

  That is, when the finger 822 is raised, it exerts on the pawl a rotational force which urges its finger 824 to engage in the groove 520 Thus, when the finger point 824 of the pawl rises beyond the lower edge of the opening connecting the slot 819 to the groove 520, it engages in one of the notches of the cartridge strip 802 disposed in the grooves 520 and causes the band of a step indexed upward in its movement When the cam follower 822 ceases to be pushed upwards, the spring 818 makes the ratchet come down,

  which drives the cam follower 822 in its movement When the ratchet

  the inclined underside of his finger 824 pushes the ratchet

  Beyond the band that is retained by the spring balls 508 The spring 818 also rotates the pawl so as to move its finger away from the band and

  to allow the ratchet to descend more easily into the slot 819.

  It should be noted that a tape 802 lined with cartridges 810 can be inserted into the open bottom end of the handle of the tool, into the opposite parallel channels 125 and pegged upwardly through the above-mentioned opening formed by elements 711 and 713 (Figs. 1 and 13) of the trigger, within the grooves 520 of the cylinder block 502, until one of the indexing slots 804 has come in contact with the ratchet finger 824 816. After this, each time the cylinder 204 moves back and forth forward and backward in the

  100, the cam 812 pivots to lower and raise respectively

  his finger 822 which, for its part, moves the finger 824 of the ratchet 816

  downwards and upwards thanks to the lower surface incli-

  born from the finger 824 and as a result of the contact between the steel balls 508 of the breech block assembly 500 with the indexing notches 804 formed in the edge opposite the band 802, each movement of back and forth combined forward and then backward of the cylinder 204, has the effect of advancing the cartridge strip 802 by an indexed step. The various members of the mechanism are judiciously sized so that each advance movement brings a new cartridge into the cartridge. the alignment of the support extension 228 of the cylinder 204 In this position, the axis of each cartridge 810 is located slightly below the tip of the firing pin 514, so that

  to allow the cartridge to be fired by its border.

  We will now describe the operation of this nailer tool.

  Assuming that the tool is in its "rest" position, that is

  that is, in the state shown in Fig. 1, it is loaded for use by introducing a strip of cartridges 802 into the nail gun, as described above, such that a cartridge 810 is placed inside the breechblock 502 and is aligned with and

  located immediately behind the cartridge support extension 228.

  Then, a fastener 900, comprising a nail 902 housed in a corrugated elastic support 904, as shown in FIG. 14, is inserted into the end of the central bore 210 of the barrel 202. The support 904 serves to maintain the nail body 902 aligned in the bore 210 of the barrel 202 and also serves to provide sufficient frictional force with the surrounding walls of the barrel 202 to hold the nail 902 in place while changing the nailing tool A this stage, the tool is in its position

"ready to operate".

  However, if at this point, the user of the tool should

  to press on the trigger without doing anything else, that would have no result.

  This is because at this stage the actuator casing 602 is retained by the spring 610 in its advanced position in contact with the casing wall 118, with the result that the release lever 706 is immobilized by the underside of the actuator shell, so that it is unable to activate the firing mechanism 600 to propel the pin

  firing 514 forward against a cartridge 810.

  Similarly, if at this time, the user of the tool had to grasp the handguard 208 and push it back towards the bolt block assembly 500 and then had to press the trigger, this time again, the envelope 602 of the actuator would remain in its advanced position and, again, nothing would happen This is due to the fact that, when the handguard 208 is pushed back, it rolls back the cylinder until the elastic force springs 610 and 618 overcomes the force of the spring 269, whereupon the recoil motion of the cylinder is interrupted and the hand guard simply slides backwards, against the thrust of the spring 269 until its end is stopped by the shoulder 108 of the casing 100. The force of the springs 610 and 618 is sufficient to stop the recoil motion of the cylinder in the casing before the latch 606 is aligned with the extension 720 of the lever 706. The result is that relaxation 702 can not trigger the firing mechanism 500 to propel it

  the firing pin 514 forwards in contact with the cartridge 810.

  If, on the other hand, the tool is in its "ready to operate"

  When the cylinder is in the position shown in FIG. 1, the front end of the barrel 202 is placed against a workpiece and the tool is pressed forward in the "firing" position. , a shot will be produced by the tool as soon as we press the trigger 702 This is due to the fact that when the tool is pressed against a piece to place it in its "firing" position, this has for effect of sliding the barrel-cylinder assembly 200 backwards, inside the tool, far enough for the cylinder 204 to house the cartridge 810 in its support extension 228 and so that, at the same time, at the push rod 630, the actuator shell 602 is pushed back into its firing position in which its latch 606 is aligned with the extension 720 of the lever 706. During this operation, the firing pin 302 is entrained back with the cylinder 204 through the close contact of its retaining rings 308 With the bottom surfaces of the cylinder being depressed 702, the latter releases the unlocking lever 706, which, in turn, pushes the latch 606 upwards, thus releasing the actuator 608 from the locking pin. firing, so that it will move forward under the action of the spring 618, thereby propelling the firing pin 514 in contact with the edge of the cartridge 810 This has the consequence of putting The hot gases that result from this firing propagate inside the extension 228 of the cylinder and, in the combustion chamber 312 of the striker 302, pushing the striker forward to the inside of the barrel-cylinder assembly 200, in contact with the fastening element

  900, so as to propel the latter out of the barrel 202 and into the room.

  When this occurs, virtually all of the hot flue gas present behind striker 302 propagates along the inside of cylinder 204 until it reaches vent holes 250. Gases escape through vent holes 250, long grooves 252 formed in the cylindrical portion 232 of the cylinder, and then relax in the region between

  the outer section 230 of the cylinder 204 and the inner surface of the guard

  From there, the gases propagate along the grooves 256 of the cylinder 204 and penetrate the grooves 220 of the barrel 202. Next, the gases exit the tool through the gaps formed between the hexagonal outer surfaces 226 of the barrel 202 and the barrels 202. It should be noted that by keeping the slot 267 of the protector 208 as short as possible, very little gas, if any, can escape from the tool through this slot. why the slot 267 has a length such that it does not extend beyond the screw 420 when the tool fires. As a result, the tool uses the explosive force of the cartridge 810 of a way

  very effective to propel the striker.

  The forward movement of striker 302 should normally stop when its forward end meets the workpiece; however, in the event that the part does not interrupt the forward movement of the striker (for example, in the case where the part is made of softwood),

  the contact of the striker head 304 with the impact collar 206 stops

  the movement in front of the striker 302 In all cases, the movement

  forward of the striker 302 is stopped before its head 304 can meet

  trer the upper tongue 410 of the locking pin 404 of the cylinder.

  The tool is then prepared for a new shot by proceeding as follows. First of all, the tool is removed in order to release it from its contact with the part, and then the barrel-cylinder unit 200 is released from its contact. of the used cartridge 810 and is brought forward to the limit of the opening 246, either by pulling the handguard 208 forward or by "projecting" the tool by a forward movement caused by a This action has the effect of bringing the head 304 of the striker 302 into contact with the rear portion of the cylinder 204, since the cylinder 204 is moved forwardly within the housing 100 and the striker 302 is prevented from moving further forward by the contact of its head with the tongue 410 of the stop mechanism 400 of the cylinder, so that these two components come again occupy the relative position shown in Figure 1 At the same time, the movement of the cylinder 204 forward in the interior The housing 100 allows the cam 812 to pivot about the pivot 814, thereby allowing the spring 818 to lower the pawl 816 back into the slot 819 to engage another notch 804 of the cartridge strip 802. that, the barrel-cylinder assembly 200 is returned to the position shown in Figure 1, by a thrust to the rear of the handguard 208 When the barrel-cylinder assembly 200 is returned to this position, the striker 302 moves back with it because of the close contact of the retaining rings 308 with the surface

  inside the cylinder 204 The return movement of the canoncylin-

  200 causes the cylinder 204 to once again apply against the stem.

  At the same time, this movement of return of the canoncylin-

  dre 200 rotates the cam 812 again on the pivot 814, thereby moving the pawl 816 upwards, the cartridge belt 802 now advancing one step upwards, so that the used cartridge moves away, while a new cartridge is placed in position near the setting pin

fire.

  From that moment, the nailer tool was brought back into position

  in which it is ready to be used, as described above.

  are made by repetition of the operations indicated above.

  The explosive powder cartridge nailing tool described below

  top offers a number of advantages over existing tools.

  First, this tool is simpler in mechanical structure than most prior art magazine tools, so it is less expensive to manufacture, easier to assemble and more

sure in operation.

  Secondly, the described tool has escape channels permitting

  designed to vent hot combustion gases from the inside of the tool so that it is quieter, is subject to less retreat, has higher energy efficiency, and is therefore more powerful and less likely to cease as a result of the accumulation of residues from

  burnt powder inside the tool.

  Third, the described tool can be loaded with what it is

  agreed to call "red" charge cartridges in combination with a

  light fixation, and can still be considered a "slow" tool.

  Fourth, this tool can be easily dismantled in the field, for easy maintenance. In this regard, it should be noted that

  can extract the entire cylinder-cylinder assembly 200 from the housing by pulling

  the stop button 406 of the stop mechanism 400 of the cylinder, and that the entire expansion device 700 can be discovered by simply removing

  the screw 146 located at the base of the handle 113 and removing the butt 142.

  The detent 702 can be easily removed by pulling the trigger pusher between the trigger and the release lever 706 and then sliding the trigger back out of the handle. Additionally, the firing mechanism 600 can be removed. of the housing 100 by a simple unscrewing of the screw 144 of the rear of the housing and a withdrawal of the rear cover 141 which is connected to the

  housing by a bayonet coupling.

  Fifth, the described tool can be modified to propel fasteners of different types and sizes (eg nails, studs, threaded pins, etc.). For this, simply remove the barrel and the firing pin and replace them with another gun and a

  other striker having different dimensions.

  Sixth, the tool described can be easily adapted to be used together with an elongate, so as to form an extended tool,

  as explained below at the end of the description.

  Seventh, the described tool uses a device

  This is a simple, relatively inexpensive method to manufacture which does not cause the tool to jam. In some prior art tools, it is difficult to remove a cartridge tape that would have jammed because of a defect in manufacture or improper placement in the tool or the fact that the tool would have been used incorrectly The improved detent device of the invention contributes to reducing these jams and

  also facilitates the extraction of a tape that could get stuck.

  Eighth, finally, the described tool uses, in its mechanism for advancing cartridges, an improved cam device in the form of a flattened region located on the top of the cam, in order to minimize

  wear and reduce tool maintenance and jams.

  In addition, the groove 249 of the cylinder ensures that the cam 812 will make proper contact in the cylinder and help to prevent rotation of the cylinder in

the casing 100.

  It should also be noted that the cover 141 is locked on the sleeve 612 such that these elements, plus the spring 618 and the washer 616, form a discrete subassembly. As a result, when the cap 141 is removed from the housing 100, the sleeve 612, the spring 618 and the washer 616

come with him.

  As mentioned above, the cartridge nailing tool

  explosive powder according to the invention is suitable for use by an

  the operator holds the tool in one hand by the handle or crosier of the casing, then operates the trigger 702 with the index finger of this hand However, it may happen that we want to use the tool to plant nails in some inaccessible places, such as ceilings, in which case the tool can be modified to receive an extension 950 having an actuating mechanism

  away from the trigger, as shown in Figures 15-17.

  Referring now to FIGS. 15A and 15B, it can be seen that the modified tool, outlined in dashed lines, under reference A is identical to the powder gun nailing tool described above, except for the bonnet original rear 141 which has been replaced by another rear cover 141 adapted to facilitate attachment to the extension 950 The cover 141 has

  is identical to the cover 141 except that it has at the rear an extension

  hollow cylindrical member 952, sized to receive one of the ends

  an arm 954 which is part of the elongation 950 The arm 954 is attached to the

  long cylindrical 952 by a pin 956, so that the nailer tool

  is firmly attached to the end of the 954 arm.

  The arm 954 is hollow in order to slidably receive a force transmission device 960. The arm 954 has an opening

  Lateral 962 near extension 952, to allow some of the

  positive transmission force 960 to extend outside the arm and be connected to the trigger 702 The force transmission device 960 comprises a solid rod 966 whose anterior end ends with a cap 968 The clevis 968 is slidably received in a guide collar 969 secured in the arm. The forked end of the yoke 968 is hinged to a

  threaded connection on the right and on the left and comprising a first link element

  its 970 provided with a tapped bore in which is screwed the threaded end of a second connecting element 972 The latter has, for its part, a threaded bore in which is screwed the threaded end of a trigger actuator 974 The connection between the connecting elements 970 and 972 is threaded to the right, while that between the connecting element 972 and the actuator 974 is threaded to the left.

  the linking element 972 in one direction, this has the effect of bringing the ac-

  970, while when turned in the opposite direction, it moves away from it. A locknut 976 is provided on the element.

  link 972 to secure the two connecting elements to each other.

  The actuator 974 has a hook-shaped end 978 and is shaped to pass around one side of the handle 113 of the tool, so that its end 978 clings around the front edge of the tool. relaxation

  702 By adjusting the threaded coupling, we can make sure that the action-

  974 tightly surrounds the trigger 702, thereby ensuring that, if the force transmission rod 966 is axially displaced within the arm 954, away from the end cap 141a, the trigger 702 will be pulled well

  rearward in the firing position, by the actuator 974.

  Referring now to FIGS. 15B and 17, it will be seen that the force transmission device is adapted to be approached and remote from the end cap 14a by a cam device. More precisely, the rod 966 is screwed into a rod of 980 plastic insulating pull which is pivotably connected by an axle 982 to the forked end of a cam follower 983 The insulating pull rod 980 has a light

  elongated 984 which receives a guide pin 985 extending transversely

  in the arm 954 and which is attached to the stop collar 998 of the handle.

  A pin 985 locks the stop collar on the arm.

  The cam follower 983 has a cylindrical portion of diameter

  reduced 986 provided with a diametrical bore 987 (Figure 17) which receives a governor

  The camming lug 988 (FIG. 15B) The reduced diameter portion 986 of the cam lug is tightly slidably fitted in a hollow portion of a cylindrical cam 989 disposed within the arm 954. The hollow portion of the cam 989 has, in its side wall, two diametrically opposed holes 990 helical profile, to receive the opposite ends of the pin 988 The length of the pin 988 is equal to or slightly less than the outer diameter of the cam 989 Preferably, the pin 988 It is free to slide axially into the bore 987 and these ends are rounded to facilitate movement relative to the inner surface of the arm. The cam 989 is secured, by means of a pin 992, to a cylindrical handle 991 which surrounds Rotating arm 954 This pin

  through a hole 993 made in the arm 954 which is widened circumferentially.

  The cam 989 has a portion of reduced diameter 994 surrounded by a torsion spring 995. One of the ends of the spring is provided at an angle of about 90 to allow the handle to rotate a quarter of a turn relative to the arm. 995 is anchored in a slot of the cam 989, while its other

  end is trapped in a hole 996 of the side wall of the arm 954.

  The spring 995 urges the cam so that the pin 988 is normally accommodated in the ends of the holes 990 that are closest to the camming lug 983, so that a gap 999 exists therebetween, as shown in FIG. B The threaded coupling to the left and right is adjusted so that, when this interval 999 exists, the actuator

  is located near the trigger 702, but without exerting pressure thereon.

  On the other hand, if the handle 991 is rotated relative to the arm 954, the pin 988 cooperates with the holes 990 to reduce the width of the gap 999 and the force transmission device 960 deviates from the rear cover 141 a and, therefore, depresses the trigger 702 Thus, if a cartridge is placed in the firing assembly block and turning the handle 991 about a quarter of a turn, while pressing the barrel of the tool against a ceiling, the rotation of the handle causes the firing of the

  cartridge and, thus, propels a nail into the ceiling.

  It will be readily understood that the extension 950 can be made in various lengths, depending on the work to be done. In all cases, the operation of the tool by rotation of the handle is advantageous because the operator can grasp the handle, as well as the extension arm to squeeze

  the tool against a piece placed above his head In addition, this method of

  Rotation reduces the risk of accidental ignition of the tool. In addition, the extension has no protruding external parts that could cause accidents.

  means of levers similar to the hand brakes of bicycles, which are

  It is also worth noting that, for reasons of cost and strength, the components of the extension are made of metal, for example, aluminum and steel On the other hand, the arm 954 of the extension

  and the insulating member 980 are made of plastic to insulate electrical

  the actuator of the trigger with respect to the cam device.

Claims (15)

  1 Propeller tool for powder cartridge fasteners explores   which comprises: (a) a housing (100) having a first bore (104); (b) a barrel-cylinder assembly (200) disposed in said first bore (104) and adapted to move in a reciprocating manner; in the housing, this assembly comprising a hollow barrel (202) and a hollow cylinder (204) having first and second longitudinal grooves (247, 248), said barrel (202) being mounted with respect to said cylinder (204) so that the two elements behave as one unit;   (c) a percussion mechanism (300) disposed in said barrel assembly   cylinder (200) and adapted to move reciprocally therein; (d) a cylinder stop mechanism (400) comprising a body (402) and protruding stop means (404) resiliently supported by said body, said cylinder stop mechanism being mounted relative to the housing so that said stop means (404) normally extends into said first groove of said cylinder, so as to limit the longitudinal stroke and rotation of said barrel-cylinder assembly (200) relative to the housing (100); (e) a breech block assembly (500) comprising a breech block (502) having a longitudinal bore and a center chamber (518), a detent pin (514) resiliently mounted in said breech block (502)   so as to be able to penetrate into said central chamber (518) under the applica-   appropriate force; (f) a firing mechanism (600) comprising a firing actuator (608), movable means slidably supporting said actuator resilient means (618) biasing said actuator and said movable means toward said firing block ( 502), locking means (606) releasably locking said actuator (608) to the moving means, and a pusher (630) extending through the bore of said breech block (502) and placed in contact therewith the barrel-cylinder assembly (200), so that a movement of this cylinder-cylinder assembly (200) within the housing (100) towards said cylinder block (507) causes said pusher (630) to move said movable means moving them away from said breechblock (502) so as to accumulate energy in the resilient means (618), whereby said resilient means (618) can propel said actuator (608) forward against said firing pin (514) when said locking means (606) has been released from said actuator (608); (g) detent means (700) for actuating said locking means (606); and, (h) a cartridge feeding mechanism (800) comprising a cam (812), a pawl (816) and a spring (818), said mechanism (800) being adapted to advance a cartridge belt (812). ) so as to place a cartridge in firing position near said cylinder (204) and said firing pin (514) as the barrel-cylinder assembly (200) moves back and forth, characterized in that said detent means (700) comprises an unlocking lever (706), a first pivot pin (710) rotatably supporting said unlocking lever (706) so that it can approach and away from said firing mechanism (600), a torsion spring (708) coupled to said unlocking lever (706) and a second pivot pin (712) for resiliently biasing said unlocking lever (706) away from said firing mechanism (600), a trigger (702), a trigger (704) connecting said trigger (702) at said unlocking lever (706) to cause said detent to force said unlocking lever (706) to move in the direction in which it actuates said locking means when said detent (702) is depressed, which causes the firing mechanism (600) to propel said firing pin (514) forward to engage   a cartridge disposed in line with said cylinder (204).   2 Tool according to claim 1, characterized in that said cylinder (204) comprises a first (231), a second (232) and a third (233) cylindrical parts in relief, said first portion (231) being arranged at the one end of said cylinder (204) near said cylinder block assembly (500), the second portion (232) being disposed in the middle of said cylinder (204), while said third portion (233) is disposed at the opposite end said cylinder (204) remote from said cylinder block assembly (500), said third portion (233) including means for directing gases around said barrel.   3 Tool according to claim 2, characterized in that said cylinder (204) has a longitudinal rib (242) extending between its first and second cylindrical portions (231, 232), said longitudinal rib (242) having a substantially rear portion wider, and in that said first groove (247) is disposed in said longitudinal vein (242) while the second   groove (248) extends into the rear portion of said rib (242).   4 Tool according to claim 3, characterized in that the second cylindrical portion (232) of said cylinder (204) has a number   holes (250) extending at an acute angle to the longitudinal axis   tudinal said cylinder (204), said holes (250) opening into the interior of said cylinder (204) so as to evacuate the gases resulting from the setting   firing the cartridge by said firing mechanism (600).   A tool according to claim 4, characterized in that the second cylindrical portion (232) of said cylinder (204) has a number of grooves, said grooves communicating with said holes (250) and extending along said second portion (232). ) cylindrical to said third cylindrical portion (233), for directing escaping gases   said holes (250) towards the anterior end of said barrel (202).   Tool according to claim 1, characterized in that said   a barrel-cylinder includes a handguard (208), said handguard having a cylindrical sensitflement portion (262) having a slot (267) aligned with said first groove (247), said slot (267) having an inlet which is limited so as to avoid a significant evacuation of gas through her.   7 propellant tool for explosive powder cartridge fasteners, characterized in that it comprises: (a) a casing (100) having a first bore (104) (b) a barrel-cylinder assembly (200) disposed in said first bore (104) and reciprocable in the housing (100), said barrel-cylinder assembly including a hollow barrel (202) and a hollow cylinder (204) detachably attached to said barrel (202) and having longitudinally extending first and second grooves (247, 248), said barrel (202) being attached to said barrel (204) such that both of these members operate as a single unit; (c) a percussion mechanism (300) slidably disposed in said barrel-cylinder assembly (202) (d) a cylinder stop mechanism (400) including projecting means normally extending into said first groove (247) said cylinder (204) so as to limit the longitudinal stroke and the rotation of said barrel-cylinder assembly (200) relative to the casing (100); (e) a breech block assembly (500) mounted in an opening of the housing (100), which assembly (500) comprises a breech block (502) having a central chamber (518), a bore, guide means therein said block for slidably receiving a strip of powder filled cartridges (802), means for releasably retaining said web (802) in said breechblock (502), and means for advancing indexed said web along said web said guide means for feeding each cartridge (810) from the belt in turn to a predetermined firing position in front of a firing pin (514); (f) a casing for the firing pin (514) mounted in said opening behind said breech block (502), a hole in said casing extending parallel to said barrel (202) and intersecting said central chamber (518); ), a firing pin (514) mounted in said hole, and a spring resiliently restraining said firing pin (514) so as to maintain it outside said central chamber (518) an appropriate force has been applied to it (g) a firing mechanism (600) comprising an actuator (608), an actuator support slidably mounted in a support chamber in the housing (100) and supporting said actuator, said support chamber comprising an end wall separating said support chamber from the casing of the firing pin (514), first elastic means urging said actuator towards said end wall, himself elastic means conds urging said actuator to move towards said end wall with respect to said support means, locking means for locking said actuator (608) with respect to said support means, resilient means normally biasing said locking means by locking position with respect to said actuator (608), and a pusher (630) attached to said support means, said pusher extending through said bore of the breech block (502) and coming to   contacting said cylinder (204) so that a movement of said barrel assembly   cylinder (200) rearwardly within the housing (100) causes a movement of said pusher which moves said support means backward, so that the firing actuator (608) can apply some force on the back of said firing pin (514) if said locking means are then released so as to unlock said actuator (608);   (h) detent means (700) for releasing said locking means, said detent means comprising a detent (702) movably mounted in said housing, a lever (706), means (704) connecting said lever to said detent such that, when pressing said trigger (702), said lever (706) encounters and releases said lock, if said actuator support is held back by said cylinder or is in contact and is blocked by said an actuator support while said actuator support is forward against said end wall, and a spring (708) normally biasing said detent (702) to maintain said lever (706) in said first position; and, (i) a cartridge feed mechanism (800) which includes a cam (812), a pawl (816) and a spring (818), said mechanism being adapted to advance a strip of cartridges (802) of placing a cartridge in firing position near said cylinder (204) and said firing pin (514), when said barrel-cylinder assembly (200) moves reciprocatingly;   said expansion device (700) comprising a first pin-   pivot (710) rotatably supporting said lever (706) so that it can approach and move away from said firing mechanism (600),   a torsion spring (708) coupled to said lever (706) and a second pin-   pivot to resiliently urge said lever to move away from said   a firing pin (600), a trigger (702), a trigger plunger (704) connecting said trigger (702) to said lever (706) such that said trigger (702) forces said lever (706) to moving in the proper direction to actuate said locking means when said trigger (700) is depressed, whereby said actuator (608) propels said firing pin (514) forward to fire a cartridge   disposed in line with said cylinder.   8 Tool according to claim 7, characterized in that said cylinder (204) comprises a first (231), a second (232) and a third (233) cylindrical parts in relief, said first portion (231) being arranged at the one end of said cylinder (204) near said cylinder block assembly (500), said second portion (232) being disposed about the middle of said cylinder (204), and said third portion (233) being disposed at the opposite end said cylinder (204), remote from said cylinder block assembly, and means for channeling the gases produced by firing a   cartridge along the outer face of said barrel-cylinder assembly (200).   9 Tool according to claim 8, characterized in that the second portion (232) of said cylinder (204) is pierced with a number of holes (250) extending at an acute angle relative to the longitudinal axis of said cylinder , said holes (250) opening into the interior space of said cylinder to evacuate the gases formed by the firing of a cartridge at   means of said firing mechanism (600).   A tool according to claim 9, characterized in that said second cylindrical portion (232) of said cylinder (204) has a number of grooves, said grooves communicating with said holes (250) and extending along said second cylindrical portion ( 232) to said third cylindrical portion (233) for directing escaping gases   said holes (250) towards the anterior end of said barrel (202).   Tool according to claim 10, characterized in that said   barrel-cylinder assembly (200) includes a hand guard (208), said guard   hand (208) having a substantially cylindrical portion (262) having a slot (267) and a groove (268) extending said slot, said slot and said groove being aligned with each other, said groove terminating at a short distance   a second substantially frustoconical portion (263).   Tool according to claim 11, characterized in that the outer surface of said barrel (202) has flat portions (272) forming   passages for the flow of gases between said barrel (202) and said shield hand (208).   Tool according to claim 12, characterized in that said actuator (608) has two ribs each having a notch (624), and in that said locking means (606) surround said actuator (608) and have two shoulders (605). ) which engage in said notches as long as   said trigger (702) has not been retracted.   14 Tool according to claim 13, characterized in that said detent (702) has a rear portion having a first round depression, said lever having a second round depression, and in that said trigger plunger (704) is constituted by a rod having rounded ends which become lugged in said first and second depressions and are retained therein by the force exerted by said torsion spring (708) on said lever (706).   The tool of claim 14, characterized in that said latch (606) is housed in a cavity of said actuator support, and in that Z 545402   said resilient latch means (618) urges the latch in the proper direction to maintain its shoulders (605) in contact with the latch said ribs.   Tool according to claim 12, characterized in that said cylinder (204) has orifices (250) for discharging the gases resulting from the firing of a cartridge by said firing pin (514), said orifices (250) being arranged around said cylinder (204) along a radial network, each orifice being inclined in order to direct the gases towards the mouth said barrel (202).   An explosive powder cartridge fastener propelling tool which includes (a) a housing (100) (b) a barrel-cylinder assembly (200) disposed to reciprocate within the crankcase (100); (c) a percussion mechanism (300) slidably disposed in said barrel-cylinder assembly (200); (d) a cylinder stop mechanism (400) including projecting means (404) extending normally into a first groove (247) said cylinder (202) so as to limit the longitudinal stroke and rotation of said barrel-cylinder assembly (200) relative to the housing (100); (e) a breech block (502) housed in said housing (100) and having a chamber (518); (f) guide means provided in said block (502) for slidably receiving a strip of powder filled cartridges (802); means for advancing said strip (802) in indexed steps along said guide means; for bringing each cartridge (810) of the belt, in turn, into a predetermined firing position in said chamber (518); (h) a firing pin (514) mounted in a hole intersecting said chamber (518); (i) resilient means resiliently braking said firing pin (514) so as to maintain it out of said chamber (518) until a suitable force has been applied thereto; (j) a firing mechanism (600) for applying a force to said firing pin (514) to propel it forward within said chamber (518) to fire a placed cartridge in said firing position; and, (k) an expansion device (700) for actuating said firing mechanism (600) characterized in that it is associated with an extension (950), attached to said housing (100) for operating said tool and for causing said detent (702) to actuate said firing mechanism (600), said extension (950) comprising a hollow arm (954) having first and second opposite ends, said first end being connected to said housing (100); ), a detent actuator (974) in contact with said detent (702), a force transmission mechanism (960) connected to said detent actuator (974) and extending within said arm (954), means connecting said force transmission mechanism (960) to said trigger actuator (974), a handle (991) rotatably mounted on said arm (954) at said second end thereof, and a camming device connecting said trigger (702) to said transmission mechanism ion of force (960) to cause the latter to pull said trigger (700) when running   said handle (991) with respect to said arm (954).