EP0782902A1 - Piston avec gorges - Google Patents

Piston avec gorges Download PDF

Info

Publication number
EP0782902A1
EP0782902A1 EP96810524A EP96810524A EP0782902A1 EP 0782902 A1 EP0782902 A1 EP 0782902A1 EP 96810524 A EP96810524 A EP 96810524A EP 96810524 A EP96810524 A EP 96810524A EP 0782902 A1 EP0782902 A1 EP 0782902A1
Authority
EP
European Patent Office
Prior art keywords
piston
shaft part
carrier
driving piston
ball
Prior art date
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.)
Granted
Application number
EP96810524A
Other languages
German (de)
English (en)
Other versions
EP0782902B1 (fr
Inventor
Markus Frommelt
Hermann Kuel
Norbert Heeb
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Publication of EP0782902A1 publication Critical patent/EP0782902A1/fr
Application granted granted Critical
Publication of EP0782902B1 publication Critical patent/EP0782902B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25C1/14—Hand-held nailing tools; Nail feeding devices operated by combustion pressure generated by detonation of a cartridge acting on an intermediate plunger or anvil
    • 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

Definitions

  • the invention relates to a powder-powered setting tool with a carrier having a cartridge receptacle, a piston guide guided in the carrier and displaceable relative to the carrier, a driving piston arranged in the piston guide, having a cylindrical shaft part and a head part, which by means of propellant gases provides a propellant charge arranged in the cartridge receptacle can be driven from a rear starting position into a setting direction-side front end position and a holding device for the driving piston, which comprises at least one radially displaceable ball, which is supported on a conical inner contour of a spring washer, which, in a receptacle of the piston guide open towards the shaft part, parallel to the longitudinal extension of the piston guide can be moved to a limited extent.
  • DE 43 13 504 A1 discloses a powder-operated setting tool with a carrier having a cartridge receptacle, a piston guide guided in the carrier and displaceable relative to the carrier, a driving piston mounted in a guide bore in the piston guide and a holding device.
  • the propellant piston can be displaced by means of propellant gases of a propellant charge arranged in the cartridge receptacle within a displacement space formed by the guide bore of the piston guide and part of the carrier.
  • the driving piston is composed of a cylindrical shaft part and a head part.
  • the holding device is formed by a receptacle provided in the piston guide and radially open towards the cylindrical shaft part of the driving piston with two balls resting on the shaft part and a spring ring surrounding the balls.
  • the length of the receptacle running parallel to the longitudinal extension of the driving piston exceeds the diameter of one of the balls.
  • the spring ring has a conical inner contour which acts on the balls and which is inclined to the driving piston axis to form an angle which opens counter to the driving direction.
  • the balls roll in the setting direction.
  • the rolling on the conical inner contour of the spring ring Balls press the spring ring radially outwards, on the other hand the balls are pressed laterally by the spring force of the spring ring against the shaft part of the drive piston. so that an independent displacement of the driving piston in the setting direction is prevented, in particular by gravity.
  • the driving piston is accelerated in the setting direction with the help of a very large amount of energy developed by a propellant charge.
  • the holding force acting on the shaft part by the holding device is negligibly small, so that the holding force does not have a negative effect on the acceleration of the driving piston.
  • the driving piston if the driving piston is accelerated with excessive energy, the driving piston strikes at a high speed on a surface of the carrier facing the setting direction in the area of the cartridge holder after a setting process, bounces off there and moves again in the setting direction so that it does not move in comes to rest in its starting position. In a subsequent setting process, the driving piston can no longer be accelerated to the correct extent, so that the fastening element to be set is not driven deep enough into an underground.
  • the invention has for its object to provide a powder-operated setting tool, the driving piston can be safely arranged and held in its starting position in the event of over-energy.
  • the object is achieved in that the shaft part of the drive piston has at least one circumferentially formed depression in the end region on the setting direction side, which cooperates with the ball of the holding device.
  • the driving piston is accelerated in the setting direction with the help of propellant gases of a propellant charge arranged in the cartridge receptacle.
  • a holding device is activated, the frictional force of which, however, has a negligible effect on the acceleration of the driving piston.
  • the carrier Simultaneously with the acceleration of the driving piston in the setting direction, the carrier is displaced with respect to the piston guide and with respect to a housing against the setting direction, so that the length of the displacement formed by the piston guide and part of the carrier increases.
  • a supported on the housing spring cooperating with the support is biased.
  • the driving piston makes a larger stroke, so that the depression arranged in the end area of the shaft part on the setting direction can pass through the area of the ball of the holding device.
  • the driving piston then rebounds on the side of the carrier in the area of the cartridge holder, the driving piston moves in the setting direction.
  • the recess comes into contact again with the ball of the holding device, and a positive connection is created between these two parts.
  • This positive connection and the axial movement of the driving piston in the setting direction activate the holding device very quickly, so that the driving piston does not move any further in the setting direction.
  • the preloaded spring arranged between the carrier and the housing displaces the carrier in the setting direction.
  • the carrier is displaced in relation to the piston guide so that the displacement length is reduced again.
  • the side of the carrier facing the setting direction comes into contact with a side of the head part facing away from the setting direction in the area of the cartridge receptacle and pushes the driving piston forward in the setting direction until the starting position of the driving piston and the carrier relative to the housing is reached again.
  • the force emanating from the spring is so great that the holding force of the holding device is overcome and the positive connection between the shaft part and the ball is released.
  • the circumferential recess is located between an end region of the piston guide on the setting direction and the holding device.
  • the bottom of the depression is expediently designed in the form of a circular section.
  • a good interlocking connection between the shaft part of the driving piston and the ball is achieved if the radius of the circular cutout essentially corresponds to the radius of the ball.
  • a driving piston driven with over-energy strikes the side of the carrier facing the setting direction at high speed.
  • the ricochet on the side of the carrier is correspondingly strong, so that the driving piston moves very quickly in the setting direction.
  • the shaft part of the driving piston preferably has several axially successive spaced-apart depressions, which can form a positive connection with the ball of the holding device.
  • the holding device is activated each time a recess hits the ball. If the kinetic energy of the driving piston exceeds the holding force, the ball is disengaged radially, the second or the next depression hits the ball and the holding device is activated again. If the holding force of the holding device is not sufficient, further radial disengagements of the ball and further activations of the holding device follow until the driving piston stops.
  • the shaft part of the driving piston advantageously has three depressions arranged axially one behind the other. In the starting position of the driving piston, all three depressions are located between the end of the piston guide on the setting direction and the ball of the holding device.
  • the width of the recesses measured in the longitudinal direction of the shaft part is preferably essentially the same.
  • the powder-operated setting tool according to the invention is pressed against the receiving material, not shown in the drawing, into which a fastening element, also not shown in the drawing, is to be driven.
  • This fastening element is stored within an element guide 14 which is firmly connected to a piston guide 4 with the interposition of a holding device 9.
  • a driving piston 6 is mounted in a guide bore of the piston guide 4.
  • the driving piston 6 is composed of a shaft part 7 and a head part 8.
  • the shaft part 7 is provided in the end region on the setting direction with three axially arranged, circumferentially formed recesses 13 with the same width B, the base of which is designed like a circular section.
  • an elastic damping element 15 is arranged, which can serve to damp the driving piston 4.
  • the holding device 9 which is composed of two diametrically opposed balls 11, a spring ring 10 surrounding the balls 11 and a receptacle 12 which is radially open towards the cylindrical shaft part 7 of the driving piston 6.
  • the spring ring 10 is resilient in the radial direction and has a conical inner contour which acts on the balls 11 and which is inclined to the driving piston axis to form an angle which opens counter to the driving direction.
  • the receptacle 12 serves to receive the balls 11 and has a length that runs parallel to the longitudinal extension of the driving piston 6 and exceeds the diameter of one of the balls 11.
  • the piston guide 4 is surrounded by a carrier 2.
  • the piston guide 4 is axially displaceable relative to the carrier 2.
  • a cartridge holder 3 is arranged, which serves to hold a propellant charge, not shown.
  • the cartridge receptacle 3 is connected to the interior of the carrier 2 and thus also to the driving piston 6 via a bore.
  • the carrier 2 is located in a housing 1 and can be moved relative to the housing 1.
  • a spring 16 arranged between the housing 1 and the carrier 2 ensures that the carrier 2 is then pushed back into its starting position relative to the housing 1 after the carrier 2 has been displaced in a setting process against the setting direction.
  • the driving piston 6 mounted in the piston guide 4 can be displaced within a displacement which is formed by the guide bore 5 of the piston guide 4 and a part of the carrier 2 which has an inner contour which is matched to the outer contour of the piston part 8.
  • the driving piston 6 is accelerated in the setting direction with the help of propellant gases of the propellant charge arranged in the cartridge receptacle 3.
  • the two balls 11 of the holding device 9 roll in the receptacle 12 of the piston guide 4 in the setting direction until they are on the opposite side of the setting direction Apply end of the receptacle 12.
  • the balls 11 interact with a conical inner contour of a spring ring 10, which is thereby preloaded radially.
  • the spring ring 10 presses the balls 11 laterally against the shaft part 7 of the driving piston 6, so that friction occurs between the shaft part 7 and the balls 11. In contrast to the energy with which the driving piston 6 is accelerated in the setting direction, this friction is negligibly small, so that the friction does not have a negative effect on the acceleration of the driving piston 6.
  • the carrier 2 is displaced with respect to the piston guide 4 and with respect to the housing 1 against the setting direction, so that the length of the displacement increases.
  • the spring 16, which is supported on the housing 1 and interacts with the carrier 2, is preloaded. After a fastening element has been driven into the receiving material, the driving piston 6 moves at a high speed towards the surface 17 of the carrier 2 facing the setting direction in the region of the cartridge receptacle 3.
  • the driving piston 6 makes a larger stroke, so that the recess 13 arranged in the end region of the shaft part 7 on the setting direction can pass through the region of the balls 11 of the holding device 9.
  • the driving piston 6 subsequently rebounds on the surface 17 of the carrier 2, the driving piston 6 moves in the setting direction.
  • the recesses 13 come into contact again with the balls 11 of the holding device 9, and one or more positive connections are formed one after the other. Due to the positive connections, the holding device 9 is activated more quickly, so that the driving piston 6 cannot move any further in the setting direction.
  • the prestressed spring 16 arranged between the carrier 2 and the housing 1 displaces the carrier 2 in the setting direction.
  • the carrier 2 is displaced relative to the piston guide 4 so that the length of the displacement is reduced again.
  • the surface 17 of the carrier 2 facing the setting direction comes into contact with a side of the head part 8 facing away from the setting direction in the area of the cartridge receptacle 3 and pushes the driving piston 6 in the setting direction in front of itself until the starting position of the driving piston 6 and the carrier 2 relative to the Housing 1 again is reached.
  • the force emanating from the spring 16 is so great that the holding force of the holding device 9 is overcome and the positive connection between the shaft part 7 and the balls 11 is canceled.
  • the circumferential recesses 13 are located between a free end of the piston guide 4 on the setting direction and the holding device 9.
  • the bottom of the recess 13 is designed in the form of a circular cutout, the radius of the circular cutout essentially corresponding to the radius of one of the balls 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Actuator (AREA)
EP96810524A 1995-12-27 1996-08-08 Piston avec gorges Expired - Lifetime EP0782902B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19548870 1995-12-27
DE19548870A DE19548870A1 (de) 1995-12-27 1995-12-27 Pulverkraftbetriebenes Setzgerät

Publications (2)

Publication Number Publication Date
EP0782902A1 true EP0782902A1 (fr) 1997-07-09
EP0782902B1 EP0782902B1 (fr) 2001-04-11

Family

ID=7781515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810524A Expired - Lifetime EP0782902B1 (fr) 1995-12-27 1996-08-08 Piston avec gorges

Country Status (6)

Country Link
US (1) US5950900A (fr)
EP (1) EP0782902B1 (fr)
JP (1) JP3907763B2 (fr)
KR (1) KR100431363B1 (fr)
DE (2) DE19548870A1 (fr)
TW (1) TW320594B (fr)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19755730A1 (de) * 1997-12-15 1999-06-17 Hilti Ag Bolzensetzgerät
DE10103893A1 (de) * 2001-01-30 2002-08-01 Hilti Ag Setzgerät
DE10105196B4 (de) * 2001-02-06 2013-09-26 Hilti Aktiengesellschaft Setzgerät
DE10105884C2 (de) * 2001-02-09 2002-12-05 Hilti Ag Kolbenhalterung
US7051528B2 (en) * 2001-08-17 2006-05-30 Yves Daunas Autonomous gas powered ram
US6679411B2 (en) 2001-12-21 2004-01-20 Illinois Tool Works Inc. Piston retention system for a fastener driving tool
FR2848489B1 (fr) * 2002-12-11 2006-02-03 Prospection & Inventions Appareil de scellement a tir indirect
DE102005000114A1 (de) * 2005-09-13 2007-03-15 Hilti Ag Setzgerät
DE102005000113B4 (de) * 2005-09-13 2014-03-27 Hilti Aktiengesellschaft Setzgerät
DE102007000135A1 (de) * 2007-03-08 2008-09-11 Hilti Ag Handwerkzeugmaschine mit pneumatischem Schlagwerk
CN203092484U (zh) * 2013-02-22 2013-07-31 郭景辉 一种用于射钉枪的卸力装置
EP2923799A1 (fr) * 2014-03-28 2015-09-30 HILTI Aktiengesellschaft Appareil d'enfoncement
DE202017103050U1 (de) * 2017-05-19 2018-08-22 Joh. Friedrich Behrens Ag Eintreibgerät zum Eintreiben von Befestigungsmitteln in Werkstücke
CN107627261A (zh) * 2017-10-31 2018-01-26 丘利锋 一种消音性能好的连发式射钉器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1034612A (fr) * 1950-10-21 1953-07-28 Pistolet fixateur de scellements, rivets et tiges de raccordements
US2724116A (en) * 1951-07-12 1955-11-22 Termet Pierre Explosively actuated fastener driving tool
US3083692A (en) * 1960-08-01 1963-04-02 Ingersoll Rand Co Impact tool safety device
FR2518925A1 (fr) * 1981-12-28 1983-07-01 Hilti Ag Appareil de scellement a piston de travail deplacable sous l'effet de gaz fortement comprimes
FR2518926A1 (fr) * 1981-12-28 1983-07-01 Hilti Ag Appareil de scellement a piston-poussoir deplacable sous l'effet de gaz fortement comprimes
EP0346275A1 (fr) * 1988-06-10 1989-12-13 HILTI Aktiengesellschaft Outil d'enfoncement actionné par poudre
DE4313504A1 (de) * 1993-04-24 1994-10-27 Hilti Ag Pulverkraftbetriebenes Setzgerät

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904787A (en) * 1955-01-12 1959-09-22 Olin Mathieson Fastener arresting device for a power actuated tool
US3115637A (en) * 1961-08-11 1963-12-31 Olin Mathieson Explosive actuated fastener driving tools
US3285131A (en) * 1965-03-31 1966-11-15 Olin Mathieson Power tool
US4349141A (en) * 1980-06-12 1982-09-14 Olin Corporation Piston return for powder actuated piston tool
US4358041A (en) * 1980-06-12 1982-11-09 Olin Corporation Powder-actuated tool with power adjustment and angle-fire control
DE3241528C2 (de) * 1982-11-10 1986-04-10 Eugen Lutz GmbH u. Co Maschinenfabrik, 7130 Mühlacker Werkzeugspannfutter für einen Bohrhammer
US4651912A (en) * 1985-05-28 1987-03-24 Uniset Corporation Hammer-activated fastener tool
US5269450A (en) * 1993-02-10 1993-12-14 Illinois Tool Works, Inc. Hammer-strikable, powder-actuated, fastener-driving tool
DE4414262C1 (de) * 1994-04-23 1995-08-31 Goro Sa Vorrichtung zum Befestigen von Riemenverbindern

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1034612A (fr) * 1950-10-21 1953-07-28 Pistolet fixateur de scellements, rivets et tiges de raccordements
US2724116A (en) * 1951-07-12 1955-11-22 Termet Pierre Explosively actuated fastener driving tool
US3083692A (en) * 1960-08-01 1963-04-02 Ingersoll Rand Co Impact tool safety device
FR2518925A1 (fr) * 1981-12-28 1983-07-01 Hilti Ag Appareil de scellement a piston de travail deplacable sous l'effet de gaz fortement comprimes
FR2518926A1 (fr) * 1981-12-28 1983-07-01 Hilti Ag Appareil de scellement a piston-poussoir deplacable sous l'effet de gaz fortement comprimes
EP0346275A1 (fr) * 1988-06-10 1989-12-13 HILTI Aktiengesellschaft Outil d'enfoncement actionné par poudre
DE4313504A1 (de) * 1993-04-24 1994-10-27 Hilti Ag Pulverkraftbetriebenes Setzgerät

Also Published As

Publication number Publication date
KR100431363B1 (ko) 2004-11-20
EP0782902B1 (fr) 2001-04-11
TW320594B (fr) 1997-11-21
DE19548870A1 (de) 1997-07-03
DE59606761D1 (de) 2001-05-17
JPH09183081A (ja) 1997-07-15
JP3907763B2 (ja) 2007-04-18
US5950900A (en) 1999-09-14
KR970033612A (ko) 1997-07-22

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