US3895752A - Explosive powder driven setting gun with silencing device - Google Patents

Explosive powder driven setting gun with silencing device Download PDF

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Publication number
US3895752A
US3895752A US355666A US35566673A US3895752A US 3895752 A US3895752 A US 3895752A US 355666 A US355666 A US 355666A US 35566673 A US35566673 A US 35566673A US 3895752 A US3895752 A US 3895752A
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US
United States
Prior art keywords
barrel
bore
ring
shaped slot
passages
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US355666A
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English (en)
Inventor
Shigefumi Hatayama
Masao Tsunekawa
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Hilti AG
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Hilti AG
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25C—HAND-HELD NAILING OR STAPLING TOOLS; MANUALLY OPERATED PORTABLE STAPLING TOOLS
    • B25C1/00—Hand-held nailing tools; Nail feeding devices
    • B25C1/08—Hand-held nailing tools; Nail feeding devices operated by combustion pressure
    • B25C1/10—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge
    • B25C1/18—Details and accessories, e.g. splinter guards, spall minimisers
    • B25C1/188—Arrangements at the forward end of the barrel, e.g. splinter guards, spall minimisers, safety arrangements, silencers, bolt retainers

Definitions

  • the present invention is directed to a silencing device for an explosive powder driven setting gun for driving bolts, studs, nails and the like into a target material and, more particularly, it is directed to the ar rangement of passageways located within the barrel of the setting gun for discharging the gases generated when the setting gun is fired.
  • the operator When a setting gun is being used, the operator holds at least one hand on the pipe section forming the outer jacket of the setting gun. After the setting gun is fired, hot gases generated in the firing operation, which are laden with combustion residues, flow at high pressure through the outflow openings in the outer jacket of the gun and strike the hand of the operator. The hot gases tend to burn the hand of the operator as well as soiling it.
  • the outflow openings not covered by the operators hand have the effect that the sound waves, which are perceived as an explosion, propagate from the setting gun into the surrounding open space.
  • Setting guns are frequently used in the heavy construction industry and, naturally, receive rather rough handling.
  • the setting guns are placed, for example, in dirty tool chests or are thrown on dirty surfaces.
  • the laterally located outflow openings are clogged and particles, for example, sand grains, find their way into the interior of the setting gun and cause considerable operating difficulties.
  • the present invention is directed to the problem of providing a simple silencing means for use on explosive powder driven setting guns utilized on construction sites.
  • a silencing device is afforded with gas outlet passages opening into the bore in the barrel and the passages are located closer to the muzzle end of the barrel than the connecting passages which initially remove the explosive gases from the bore.
  • Good results have been obtained with a silencer arrangement in which three connecting passages are arranged equiangularly spaced apart about the surface of the bore.
  • the connecting passages are located in the rearward portion of the barrel or piston guide and are located forwardly of the section within the barrel which forms the combustion chamber.
  • the barrel or the combination of the barrel and a pipe sleeve form an axially extending ring-shaped slot which receives the explosion gases from the connecting passages and in which they contact the inwardly directed surface of the slot for deflecting the gases through gas outlet passages connecting the ring-shaped slot to the bore within the barrel.
  • the gases again change direction and flow out of the muzzle end of the barrel.
  • Each change in direction of the gas flow causes a deceleration and expansion of the gases and, thus, contributes considerably to the silencing effectv
  • the hot gases instead of issuing laterally from the gun jacket, flow out of the muzzle end of the barrel in the driving direction and, as a result, are completely harmless with respect to the operator handling the gun.
  • the gun jacket is formed by an outer pipe section preferably detachably connected in a known manner about the barrel, for example, by a screw thread.
  • Increased stability for the setting gun is achieved by providing a large diameter muzzle flange at the forward end of the pipe section.
  • the connecting passages leading the gases from the bore are directed forwardly at an acute angle to the longitudinal axis of the gun so that the gas is not aimed directly at the surface of the pipe section.
  • the gas outlet passages are located in radial planes staggered angularly with regard to the radial planes containing the connecting passages.
  • the individual explosion gas currents entering the ring-shaped slot from the connecting passages impinge at a high velocity against the inner surface of the pipe section defining the outer surface of the slot and are separated into partial currents.
  • the partial currents bounce off the inner surface of the pipe section and start to whirl about until they flow through the closest gas outlet passage into the bore within the barrel.
  • the gas outflow passages can be arranged and designed differently to correspond to the different outflows based on the strength of the charge used and this factor is of decisive importance in providing the silencing effect.
  • Gas outflow passages in the form of slots extending in the longitudinal direction parallel to the axis of the barrel have proved particularly effective.
  • bores arranged in series The explosion gases flowing into the bore from the gas outflow passages tend to pass to the exterior ofthe gun through its muzzle, that is, in the firing direction, regardless of whether the gun uses a driving piston.
  • the piston shaft seals off the muzzle bore in the driving direction so that the gases tend to accumulate in the bore under certain circumstances and have difficulty in being discharged.
  • one or a number of outflow openings are provided which extend from the bore to the outside of the barrel and they are arranged in the forward end of the barrel to facilitate the discharge flow of the gases. It is irrelevant whether the outflow openings are provided in the barrel itself or, for example. in the bore of a pipe section designed as a muzzle flange. It is particularly effective if the number of outflow openings correspond to the number of gas outflow passages from the ring-shaped slot into the bore.
  • the outflow openings are arranged in the same radial planes with the gas outflow passages.
  • a direct deflection of the expanded but still dirtladen gases from the gas outflow passages through the bore to the exterior ofthe gun is achieved. Any further deflection of the gases would have only a minor silencing effect and would result in the deposition of considerable amounts of residue within the interior of the gun.
  • the cross sectional form of the outflow openings can be selected at random.
  • the outflow openings are designed as grooves formed in the surface of the bore and extending parallel to its axis for increasing the cross sectional area of the bore at the gun muzzle.
  • Such an arrangement is advantageous for maintenance purposes as well as for operating and manufacturing purposes. Accordingly, the cleaning of the outflow openings is very simple, since the muzzle bore and the outflow openings can be cleaned of any residue from the explosion gases in a single cleaning step with a circular brush.
  • a gaspermeable insulating material acoustically inert to explosive powder gases and temperatures, such as mineral wool, is positioned within the ring-shaped slot.
  • the insulating material affords additional sound absorption and the filtration of solid substances.
  • the filtering effeet is obtained, since the bulk of the combustion residue adheres to the relatively large surfaces of the insulating material.
  • the ring-shaped slot For increasing the silencing effect, it is preferable to divide the ring-shaped slot with fins or other dividing elements so that several silencing chambers are formed interconnected with one another.
  • the higher pressure ofthe gases entering the ringshaped slot is throttled in the resulting intervals, which can be segment-shaped, and, as a result, leads to considerable silencing of the explosion within the setting gun.
  • a filtering effect is provided in such an arrangement. In this arrangement it is only necessary to remove the outer enclosing pipe section from the barrel for cleaning the silencing chambers. There is no replacement of parts necessary.
  • FIG. 1 is a partial longitudinal sectional view of the forward part of an explosive powder driven setting gun, embodying the present invention
  • FIG. 2 is a transverse sectional view of the gun shown in FIG. I taken along the line IIII;
  • FIG. 3 is a transverse sectional view of the gun shown in FIG. 1 taken along the line III-III;
  • FIG. 4 is a partial longitudinal sectional view of another embodiment of the setting gun illustrated in FIG.
  • FIG. 5 is a transverse sectional view, similar to FIG. 2, of another embodiment of the setting gun.
  • FIG. 6 is a partial longitudinal sectional view of still another embodiment of the setting gun shown in FIG. 1.
  • the setting gun includes a barrel 1 forming an axially elongated bore 2.
  • a driving piston 3 is axially displaceably positioned within the bore, and as shown in FIG. 1, is in its forward position within the bore having driven a fastening element 4 into the receiving material 5.
  • the piston 3 is displaced axially rearwardly through the bore 2, relative to its position in FIG. I, so that its head 9 is located within the rearward section 11 of the bore 2.
  • a pipe section 7 is secured to the barrel by means of a thread 8 and has a muzzle flange 6 which extends radially outwardly from the barrel and the pipe section and also extends forwardly of the muzzle end of the barrel into contact with the receiving material 5.
  • the bore extending rearwardly from the muzzle end of the barrel, forms a guide for the driving piston 3 which has a diameter substantially the same as that of the forward or leading end of the driving piston.
  • an enlarged diameter section I3 is provided which also has a larger diameter than the rearward section 11.
  • the forward end of the section 13 within the bore 2 is connected to the ring-shaped slot by three connecting passages 14, equiangularly spaced apart from one another.
  • three gas outlet passages 18 are formed communicating between the ring-shaped slot and the bore within the barrel.
  • the gas outlet passages have a slot like configuration extending in the longitudinal direction of the barrel.
  • outlet openings 19 are provided which extend in the longitudinal direction of the barrel parallel to its axis and terminate at the muzzle end of the barrel.
  • a propellent or explosive powder charge is ignited at the rearward end of the bore, that is, the end opposite the muzzle end of the barrel.
  • the driving piston has its head 9 located in the section 11 of the bore and this section has the same diameter as the head. Accordingly, the trailing end face 12 of the piston head 9 forms a wall of closed combustion chamber within the barrel.
  • the explosion gases generated when the gun is fired exert a pressure on all of the surfaces within the closed combustion chamber and drive the axially displaceable piston 3 and the fastening element 4 in the direction of the receiving material 5.
  • the piston 3 accelerates within the barrel, its head 9 enters the larger diameter section 13 of the bore 2 and the explosion gases are then free to flow forwardly between the lateral surfaces of the head 9 and the surface of the bore 2 under a relatively high pressure into the connecting passages 14.
  • the connecting passages extend generally in the direction of the axis of the barrel, however, they diverge outwardly at an acute angle to the longitudinal axis of the barrel into the ring-shaped slot 17 defined by the inner surface 15 of the pipe section and the recessed outer surface 16 of the barrel. Due to the orientation of the connecting passages 14, the explosion gases flow generally in the axial direction of the bore and are directed at an acute angle against the inner surface 15 of the pipe section 7.
  • each of the connecting passages 14 and impinge against the inner surface lS of the pipe section they are divided into separate flow currents. These flow currents of the gases begin to whirl within the ring slot 17 and then flow through the gas outlet passages 18.
  • the gas outlet passages are located in radial planes displaced angularly from the radial planes of the connecting passages.
  • the explosion gases flow along the periphery of the bore 2. From the gas outlet passages 18 bordering the bore 2, the explosion gases, already considerably expanded, exit from the barrel in the driving direction of the gun, after another change in direction, and flow outwardly through the outlet openings 19 over the exterior surface of the piston shaft 21.
  • the outlet openings 19 are formed as grooves in the inner surface at the forward or muzzle end of the bore and are arranged in radial planes aligned with the radial planes containing the gas outlet passages.
  • a driving piston is used in inserting the anchoring element 4 into the receiving material, however, it is also possible to drive the fastening or anchoring element without the use of a piston and the anchoring element itself affords the corresponding function of the driving piston. As far as the sound-absorbing effects are concerned, the results obtained in a setting gun without a driving piston are the same as those in which a driving piston is used.
  • mineral wool 30 a gas-permeable insulating material, is positioned within the ring-shaped slot 17.
  • the insulating material affords additional sound absorption along with filtration of solid substances.
  • fins 32 extending radially outwardly from the barrel 1 within the ring shaped slot 17 have their outer edges spaced inwardly from the inner surface of the pipe section 7 and, in combination with the axially extending partitions 34, divide the slot into a plurality of interconnected silencing chambers.
  • An explosive power driven setting gun for driving anchoring members, such as bolts, studs, nails and the like, into a target material, comprising an axially elongated barrel forming a bore and having a forward muzzle end and an oppositely disposed rearward end, a sleeve extending in the axial direction of said barrel and secured to and laterally enclosing said barrel for a portion of its axial length forwardly of the rearward end of its bore, an axially extending portion of the outer surface of said barrel disposed in spaced relationship to the inner surface of said sleeve and forming therebetween an axially extending ring-shaped slot about said barrel radially outwardly from said bore, at least one connecting passage extending through said barrel between the bore therein and said ring-shaped slot, at least one gas outlet passage located in said barrel radially inwardly of said ring-shaped slot and communicating between said ring-shaped slot and the bore in said barrel, said gas outlet passage located closer to the forward end of said bore than said connecting
  • An explosive powder driven setting gun for driving anchoring members, such as bolts, studs, nails and the like, into a target material, comprising an axially elongated barrel forming a bore and having a forward muzzle end and an oppositely directed rearward end, a sleeve extending in the axial direction of said barrel and secured to and laterally enclosing said barrel for a portion of its axial length forwardly of the rearward end of said bore, an axially extending portion of the outer surface of said barrel disposed in spaced relationship to the inner surface of said sleeve and forming therebetween an axially extending ring-shaped slot about said barrel radially outwardly from said bore, a plurality of connecting passages extending through said barrel between the bore therein and said ring-shaped slot, a plurality of gas outlet passages located in said barrel radially inwardly of said ring-shaped slot and communicating between said ring-shaped slot and the bore in said barrel, said gas outlet passages spaced from said connecting passage
  • An explosive powder driven setting gun as set forth in claim 2, wherein a plurality of said outlet openings are provided in said barrel corresponding to the number of said gas outlet passages and each said outlet opening is aligned with a different one of said gas outlet passages.
  • An explosive powder driven setting gun for driving anchoring members, such as bolts. studs, nails and the like, into a target material, comprising an axially elongated barrel forming a bore and having a forward muzzle end and an oppositely directed rearward end, a sleeve extending in the axial direction of said barrel and secured to and laterally enclosing said barrel for a portion of its axial length forwardly of the rearward end of its bore, an axially extending portion of the outer surface of said barrel disposed in spaced relationship to the inner surface of said sleeve and forming therebe tween an axially extending ring-shaped slot about said barrel radially outwardly from said bore, a plurality of connecting passages extending through said barrel between the bore therein and said ring-shaped slot, a plurality of gas outlet passages located in said barrel radially inwardly of said ring-shaped slot and communicating between said ring-shaped slot and the bore in said barrel, said gas outlet passages spaced
  • An explosive powder driven setting gun for driving anchoring members, such as bolts, studs, nails and the like, into a target material, comprising an axially elongated barrel forming a bore and having a forward muzzle end and an oppositely directed rearward end, a sleeve extending in the axial direction of said barrel and secured to and laterally enclosing said barrel for a portion of its axial length forwardly of the rearward end of its bore, an axially extending portion of the outer surface of said barrel disposed in spaced relationship to the inner surface of said sleeve and forming therebetween an axially extending ring-shaped slot about said barrel radially outwardly from said bore, a plurality of connecting passages extending through said barrel between the bore therein and said ring-shaped slot, a plurality of gas outlet passages located in said barrel radially inwardly of said ringshaped slot and communicating between said ring-shaped slot and the bore in said barrel, said gas outlet passages spaced from said con nect
  • An explosive powder driven setting gun as set forth in claim 6, wherein said means for dividing said ring-shaped slot are fins.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Pipe Accessories (AREA)
US355666A 1972-05-02 1973-04-30 Explosive powder driven setting gun with silencing device Expired - Lifetime US3895752A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2221374A DE2221374C2 (de) 1972-05-02 1972-05-02 Pulverkraftbetriebenes Setzgerät

Publications (1)

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US3895752A true US3895752A (en) 1975-07-22

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ID=5843797

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Application Number Title Priority Date Filing Date
US355666A Expired - Lifetime US3895752A (en) 1972-05-02 1973-04-30 Explosive powder driven setting gun with silencing device

Country Status (10)

Country Link
US (1) US3895752A (xx)
JP (1) JPS5545353B2 (xx)
AT (1) AT333215B (xx)
BE (1) BE798925A (xx)
CA (1) CA993151A (xx)
CH (1) CH550643A (xx)
DE (1) DE2221374C2 (xx)
FR (1) FR2183000B1 (xx)
GB (1) GB1399776A (xx)
IT (1) IT982655B (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139137A (en) * 1977-01-11 1979-02-13 Gupta Harish C Fastener driving tool
US4196834A (en) * 1978-12-11 1980-04-08 Olin Corporation Noise reducer for powder actuated fastening tool
US5038665A (en) * 1990-02-02 1991-08-13 Honeywell Inc. Silent stud gun attachment device
US6059162A (en) * 1998-10-16 2000-05-09 Illinois Tool Works Inc. Exhaust baffle and spring assisted reset and dampener for powder actuated tool
WO2000071305A1 (en) * 1999-05-21 2000-11-30 Cetram Pty. Limited Power actuated tool and shroud for use with the tool
US6182881B1 (en) * 1996-09-19 2001-02-06 Adolf Wurth Gmbh & Co. Kg Stud driver and spring therefor
AU765619B2 (en) * 1999-05-21 2003-09-25 Cetram Pty Limited Power actuated tool and shroud for use with the tool
US20050005570A1 (en) * 2003-05-26 2005-01-13 Freyssinet International (Stup) Method of overlocking at least one strand in an anchoring block and system for overlocking at least one strand in an anchoring block
US20110297727A1 (en) * 2010-06-08 2011-12-08 Societe De Prospection Et D'inventions Techniques Spit Plug guide for a nailing device and a device comprising the plug guide
US20170106515A1 (en) * 2014-04-09 2017-04-20 Hilti Aktiengesellschaft Method for operating a hand-held or semi-stationary setting device
US9874418B2 (en) 2015-06-26 2018-01-23 Jeff A. White Sound suppressing gun barrel
CN109202810A (zh) * 2018-10-05 2019-01-15 宜宾市南溪区鑫盛技术开发有限公司 自动排渣散热式轴向射钉器

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU529351B2 (en) * 1978-04-05 1983-06-02 Olin Corporation Powder actuated fastening tool
JPS61105582U (xx) * 1984-12-17 1986-07-04
DE10256389A1 (de) * 2002-12-02 2004-06-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Metallhalogenidlampe mit keramischem Entladungsgefäß

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2773259A (en) * 1954-05-17 1956-12-11 Joseph B Cox Safety shield for explosively driven tools
US2775762A (en) * 1951-09-10 1957-01-01 Hilti Martin Explosively actuated fastener driving tool
US3029434A (en) * 1954-06-03 1962-04-17 Olin Mathieson Powder-actuated tools
US3112487A (en) * 1961-02-02 1963-12-03 Fur Montage Technik Anstalt Explosively actuated stud driving apparatus
US3407982A (en) * 1966-04-04 1968-10-29 Olin Mathieson Muzzle bushing and fastener for power-actuated tools
US3658229A (en) * 1970-07-30 1972-04-25 Omark Industries Inc Stud driving tool

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL85367C (xx) * 1952-10-25
US2859444A (en) * 1953-04-01 1958-11-11 Ile D Etude De Procedes De Sce Explosively actuated gun
BE557158A (xx) * 1956-12-31
US2877750A (en) * 1957-05-29 1959-03-17 Olin Mathieson Hammer and buffer mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775762A (en) * 1951-09-10 1957-01-01 Hilti Martin Explosively actuated fastener driving tool
US2773259A (en) * 1954-05-17 1956-12-11 Joseph B Cox Safety shield for explosively driven tools
US3029434A (en) * 1954-06-03 1962-04-17 Olin Mathieson Powder-actuated tools
US3112487A (en) * 1961-02-02 1963-12-03 Fur Montage Technik Anstalt Explosively actuated stud driving apparatus
US3407982A (en) * 1966-04-04 1968-10-29 Olin Mathieson Muzzle bushing and fastener for power-actuated tools
US3658229A (en) * 1970-07-30 1972-04-25 Omark Industries Inc Stud driving tool

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139137A (en) * 1977-01-11 1979-02-13 Gupta Harish C Fastener driving tool
US4196834A (en) * 1978-12-11 1980-04-08 Olin Corporation Noise reducer for powder actuated fastening tool
US5038665A (en) * 1990-02-02 1991-08-13 Honeywell Inc. Silent stud gun attachment device
US6182881B1 (en) * 1996-09-19 2001-02-06 Adolf Wurth Gmbh & Co. Kg Stud driver and spring therefor
US6059162A (en) * 1998-10-16 2000-05-09 Illinois Tool Works Inc. Exhaust baffle and spring assisted reset and dampener for powder actuated tool
AU765619B2 (en) * 1999-05-21 2003-09-25 Cetram Pty Limited Power actuated tool and shroud for use with the tool
WO2000071305A1 (en) * 1999-05-21 2000-11-30 Cetram Pty. Limited Power actuated tool and shroud for use with the tool
US20050005570A1 (en) * 2003-05-26 2005-01-13 Freyssinet International (Stup) Method of overlocking at least one strand in an anchoring block and system for overlocking at least one strand in an anchoring block
US7614134B2 (en) * 2003-05-26 2009-11-10 Freyssinet Method of overlocking at least one strand in an anchoring block and system for overlocking at least one strand in an anchoring block
US20110297727A1 (en) * 2010-06-08 2011-12-08 Societe De Prospection Et D'inventions Techniques Spit Plug guide for a nailing device and a device comprising the plug guide
US9073194B2 (en) * 2010-06-08 2015-07-07 Societe De Prospection Et D'inventions Techniques Spit Plug guide for a nailing device and a device comprising the plug guide
US20170106515A1 (en) * 2014-04-09 2017-04-20 Hilti Aktiengesellschaft Method for operating a hand-held or semi-stationary setting device
US9874418B2 (en) 2015-06-26 2018-01-23 Jeff A. White Sound suppressing gun barrel
CN109202810A (zh) * 2018-10-05 2019-01-15 宜宾市南溪区鑫盛技术开发有限公司 自动排渣散热式轴向射钉器
CN109202810B (zh) * 2018-10-05 2024-03-19 宜宾市南溪区鑫盛技术开发有限公司 自动排渣散热式轴向射钉器

Also Published As

Publication number Publication date
AT333215B (de) 1976-11-10
CH550643A (de) 1974-06-28
DE2221374C2 (de) 1983-02-10
DE2221374A1 (de) 1973-11-22
JPS5545353B2 (xx) 1980-11-17
FR2183000A1 (xx) 1973-12-14
CA993151A (en) 1976-07-20
ATA309573A (de) 1976-02-15
JPS4954979A (xx) 1974-05-28
GB1399776A (en) 1975-07-02
BE798925A (fr) 1973-08-16
FR2183000B1 (xx) 1976-05-07
IT982655B (it) 1974-10-21

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