FR2551689A1 - PERFECTIONAL SILENCER SEALING GUN - Google Patents

Abstract

THE INVENTION RELATES TO A BUILDING SEALING GUN. THIS SEALING GUN INCLUDES A SILENCER7 PLACED IN THE CARCASS1 MONOBLOC OF THE TOOL, PARALLEL TO THE AXIS OF THE CANNON3, IN WHICH THE LAUNCHER PISTON4 WORKS. THIS SILENCER7 IS IN THE FORM OF A RELAXATION CHAMBER6 WHICH COMMUNICATES WITH THE GAS CHAMBER BEHIND THE LAUNCHER PISTON, WHEN THE LATTER IS PLACED IN ITS WORKING POSITION, AND OF A PLUG11 ASSOCIATED WITH A SUCCESSION OF DISCS13, 14, 15 SERVING TO FRACTION THE INTERIOR VOLUME OF THE SAID RELAXATION CHAMBER AND WHICH PRESENT PERFORATIONS OF WHICH THE NUMBER AND THE OVERALL SECTION GROW FROM THE DISK CLOSE TO THE GAS INTAKE SLOT8, TO THE DISC15 NEAREST TO THE EXIT BY WHERE GASES ARE RELEASED INTO THE ATMOSPHERE. MAIN APPLICATION: GUNS INTENDED TO DRIVE NAILS OR OTHER SEALING OBJECTS INTO MASONRY.

Description

Silent sealing gun.

  Various embodiments of sealing tools for planting nails or equlivallents, in the form of pistols comprising a launching piston guided in a barrel and positively actuated by the gases generated by the firing of a cartridge propulsion, percussion means controlled by a trigger to control the firing of the cartridge and a silencer provided for the relaxation of the gases after the actuation of the launcher piston and to reduce the

noise of the tool.

  According to a previously known embodiment, the silencer is constituted by a body-shaped body, attached to the carcass of the tool, to delimit a chamber 15 for receiving gases to be released, and by a plurality of elements splitter or baffles, disposed in said chamber to divide the interior volume and reduce the pressure and velocity of the gases before they

  are discharged into the atmosphere.

  The boot-shaped body is generally arranged and fixed perpendicularly to the axis of the barrel, below it, or parallel to the butt of the tool, which has a significant effect on the overall size of the barrel. the tool on the other hand, the mounting and fixing of the silencer boot-shaped body on the carcass of the tool and the inclusion of several splitting elements, besides making the silencer complicated,

  have a negative impact on assembly times and costs.

  According to another embodiment of the sealing pistol, the silencer is incorporated in the butt of the tool itself and also comprises, in this case, several fractional elements of the internal volume.

of the relaxation room.

  This has the disadvantage of considerably increasing the size of the stock and reducing the workability of the tool, in addition to having a further 2 m

  several splitting elements.

  The subject of the present invention is a sealing tool, comprising a throwing piston guided axially in a barrel and positively actuated by the gases engendered by the firing of a propulsion cartridge, means of percussion controlled by a detent for controlling the firing of the propulsion cartridge and a silencer placed in the carcass of the tool, parallel to the axis of said barrel, characterized by a silencer 10 placed in the carcass, below the barrel and parallel thereto , to receive, relax, cool and evacuate gases when the throwing piston is brought

at his work position.

  The object of the invention is therefore to propose and produce a sealing gun of a particularly simple and compact structure and which is devoid of the

  disadvantages and advantages enumerated in connection with the known and above-mentioned sealing gun embodiments.

  Another object of the invention is to provide a sealant pis20 comprising a one-piece carcass, in which are formed both, the housing of the barrel, the expansion chamber of the silencer, and wherein the splitting of the interior volume of the relaxation chamber is obtained by a single element which includes a closure cap of this chamber and, jointly,

  to this stopper, a succession of discs presenting.

different perforations.

  An embodiment of the invention will now be described by way of non-limiting example with reference to the accompanying drawings in which: Figure 1 is a perspective view of the sealing gun with its silent plug shown separately; Figure 2 is a side view and partly in section of the completed tool of its silencer; Figure 3 is a section taken along arrows III-III of Figure 2; and FIG. 4 is a longitudinal partial section

  silencer plug, on an enlarged scale.

  In the drawings, I generally denoted by I the carcass of the tool provided with its grip handle or butt 2 and which carries, in a manner known per se: a barrel 3, a starter piston 4, which one has only shown the rod, which is axially guided in said barrel and can be pushed positively forward to plant the nails under the action of the gases generated by firing a propellant cartridge; and unrepresented striking means controlled by a trigger 5 and for controlling the firing of said cartridge and, consequently, the actuation of the launcher piston. According to the present invention, there is provided in the carcass 1, which is constituted by a single piece, a gas expansion chamber 6 intended to receive a silent element 7 More precisely, said chamber 6 is formed in the carcass 1 to be located below the barrel and, therefore, the starter piston 4,

  with its axis parallel to that of the barrel.

  The expansion chamber 6, see FIG. 2, communicates at its rear part with the sliding surface of the launcher piston 4, through a slot 8 serving to allow the gases to enter this chamber. At its front end, the chamber 6 is open. and has an intermediate portion and, more specifically, in the vicinity of said

  9, the chamber 6 communicates with the atmosphere through one or more exit hole (s) 10, see figu30 re 3.

  The silencer 7 housed in the expansion chamber 6 is constituted by a screw cap 11 integral with a small coaxial rod 12 which in turn bears a succession of disks 13, 14, 15, spaced from each other and which present an outer diameter corresponding to the internal diameter of the chamber 6 The screw cap 11 is intended to cooperate with the internal thread 9 to close the front end of the chamber 6 and support the

255 1639

  -4 discs in the chamber itself via the rod 12 Thanks to the reciprocal connection established between the aforementioned parts of the silencer, the simple screwing of the screw cap 10 in the threaded portion 9 determines the correct disposition of the discs 13, 14, 15 in the expansion chamber and a fractionation of the interior volume of this chamber by the discs These discs 13, 14, 15 also have holes or passages 13 ', 14', 15 'respectively, which are in number and / or present incremental total sections gradually decreasing

  from the disc 13 closest to the gas inlet slot 8 in the chamber 6 to the disc 15 closest to the screw cap 1, that is to say the closest to the hole or holes output 10.

  In this way, the gases that pass from the barrel 3 into the chamber 6 after the firing of each cartridge used for the propulsion of the pistonlanceur 4 at the time of the driving of the nails, are forced to pass through the holes or passages 13 ', 14', 15 'of the disks 20 of the silencer This causes a rolling of the gases, with

  consecutive fractionation of the wavefront and reduction of the temperature of these gases before they are released to the atmosphere with a suitably reduced energy through the radial hole or radial holes 10.

  The description given below is therefore

  obviously, both the simplicity of implementation and mounting of the silencer, the characteristics of compactness and practice of the tool, which describe the fact that the silencer is placed directly in the carcass parallel to the barrel and, preferably, in minimal congestion conditions and without influencing

on the holding of the tool.

  It goes without saying that we will be able to make various modifications to the device which has just been described, solely as a non-limiting example without thereby going out

of the scope of the invention.

-5-S

Claims (3)

  1. Sealing tool, presented in the form of a pistol, comprising a carcass (1), a barrel (3) mounted on the carcass, a throwing piston (4) guided axially in said barrel and positively actuated by the gases generated by the firing of a propulsion cartridge, and percussion means controlled by a detent (5) to determine the firing of said cartridge, characterized by a silencer (7) placed in the carcass below the barrel and parallel to the barrel, to receive, relax, cool and evacuate the gases when the starter piston is brought to its working position. 2. Sealing tool according to claim 1, characterized in that it comprises an expansion chamber (6) formed in the carcass (1) with its axis parallel to the axis of the barrel (3), and which communicates with the latter through a slot (8) for entering the gas into the chamber and with the outside through one or more radial holes (10) and in that there is provided a silent element (7) housed and enclosed in said chamber (6) and comprising a succession of disks (13, 14, 15) spaced apart from each other and serving to split the interior volume of said chamber, said disks having holes or passages (13, 14 ', 151) whose number and / or sections decrease from the disk closest to said gauze inlet slot to the disk closest to the radial hole or   radial exit holes (10) through which the gases exit the chamber and disperse into the atmosphere.   3. sealing tool according to one of claims 1 and 2, characterized in that said silent element (7) is constituted by a single piece and comprises   a screw cap (11), intended to be assembled to a threaded portion (9) provided at the end of said chamber (6) which is opposed to that which communicates with the barrel (3) through the slot (8); ), a coaxial rod (12) integral with said screw cap (11) and a plurality of 2 5 5 1 6 8 9   discs (13, 14, 15) integral with said rod (12) and spaced along the length thereof, these discs being provided with holes (13 ', 14', 15 ') for the passage of gases.