EP0205633B1 - Assemblage de soupape - Google Patents

Assemblage de soupape Download PDF

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Publication number
EP0205633B1
EP0205633B1 EP85107700A EP85107700A EP0205633B1 EP 0205633 B1 EP0205633 B1 EP 0205633B1 EP 85107700 A EP85107700 A EP 85107700A EP 85107700 A EP85107700 A EP 85107700A EP 0205633 B1 EP0205633 B1 EP 0205633B1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
effective surface
piston member
bore
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.)
Expired
Application number
EP85107700A
Other languages
German (de)
English (en)
Other versions
EP0205633A1 (fr
Inventor
Wolfgang Dipl.-Ing. Elliesen
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.)
Joh Friedrich Behrens AG
Original Assignee
Joh Friedrich Behrens 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 Joh Friedrich Behrens AG filed Critical Joh Friedrich Behrens AG
Priority to DE8585107700T priority Critical patent/DE3561503D1/de
Priority to AT85107700T priority patent/ATE32194T1/de
Priority to EP85107700A priority patent/EP0205633B1/fr
Priority to US06/776,675 priority patent/US4667572A/en
Priority to JP60249920A priority patent/JPS61293622A/ja
Publication of EP0205633A1 publication Critical patent/EP0205633A1/fr
Application granted granted Critical
Publication of EP0205633B1 publication Critical patent/EP0205633B1/fr
Expired 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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
    • B25C1/042—Main valve and main cylinder
    • 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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/041—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure with fixed main cylinder
    • B25C1/043—Trigger valve and trigger mechanism
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87169—Supply and exhaust
    • Y10T137/87193—Pilot-actuated

Definitions

  • the invention relates to a valve assembly for a pneumatic nailer with a valve piston (closing member of the inlet and outlet valve for the working stroke), which is axially displaceable axially above the working cylinder and, in its lower position (closed position), blocks the working stroke against compressed air supply and in its upper position (open position) shuts off an outlet channel, which is connected to the working cubicle via a bore in the valve piston and which has a lower effective surface which is constantly pressurized by the compressed air source and an upper one which can be optionally exposed to atmospheric pressure or the pressure of the compressed air source with the aid of a pilot valve has a larger effective area, a sleeve-shaped valve seat element which is sealingly and longitudinally displaceable in a bore and is limited in its movement by an upper and a lower stop, the bore of which with the bore of the valve piston in Ve There is a bond and has a first active surface facing away from the valve piston and a second active surface facing towards the valve piston, the latter active surface being the larger one and the
  • valve arrangement is known (DE-PS 2601 836). If the valve piston is in its open position and its upper active surface is pressurized again in order to move it into the closed position, the sleeve-shaped valve element follows the valve piston and remains in sealing engagement with it, so that the outlet channel remains blocked. This prevents compressed air from flowing directly from the reservoir to the outlet channel as long as the valve piston is not yet in its closed position. If no special precaution was taken, compressed air flowing into the working stroke space would still escape briefly via the outlet until it is shut off in the upper closed position of the valve piston.
  • the known valve arrangement provides a special seal on the valve piston, which takes the working piston upwards during the opening movement of the valve piston until the valve piston has reached its closed position. In this way, an overlap-free valve arrangement is obtained.
  • the seal mentioned on the valve piston is complex and must be regarded as a wearing part.
  • valve piston consists of two valve bodies which are movable relative to one another
  • the first valve body has an upper and a lower plate.
  • the upper plate is sealingly guided in a recess in the housing, and its upper active surface is optionally subjected to atmospheric pressure or the pressure of the compressed air source.
  • the lower plate has an upper circumferential sealing surface.
  • the second valve body is arranged between the upper and lower plates. Its upper section is sealingly guided in a recess in the upper plate of the first valve body. Its lower section surrounds the lower plate of the first valve body and acts in a sealing manner with the working cylinder.
  • the structure of the first valve body makes it necessary to manufacture it from at least two separate components. In the known valve arrangement, they are manufactured separately and screwed together. During the opening process, the lower plate of the first valve body strikes against the second valve body. This results in a not inconsiderable mechanical stress. Since this stress takes place in the sealing area, there is a risk that the sealing effect will be impaired after some time. During the closing process, the working cylinder moves upwards, towards the second valve body. As a result, a distance from the second valve body can be established during the downward movement of the first valve body, so that the air can escape from the cylinder during the return stroke. A displaceable mounting of the working cylinder requires additional effort.
  • the invention has for its object to provide a non-overlapping valve assembly for pneumatic nailers, which is particularly simple and low-wear.
  • valve piston has a first piston body, which has the bore and the lower and upper active surface and cooperates with the valve seat element, and an annular second piston body is slidably and axially displaceably mounted in an annular recess of the first piston body facing the working stroke active surface of the second piston body facing away from the working stroke is connected to the upper active surface of the first piston body via at least one bore is, while a lower active surface of the second piston body cooperates sealingly with the working cylinder and in the lower position (closed position) is constantly acted upon by the pressure of the compressed air source and the ratio of the active surfaces of both piston bodies is such that when the pressure on the upper active surface of the first piston body is reduced first the first piston body and then at a lower pressure value the second piston body is moved to the upper position.
  • the two piston bodies are simple disk-shaped or ring-shaped components which can be inserted one after the other in a simple manner into the housing.
  • the annular piston inserted in an annular recess of the first piston body interacts with the working cylinder. It protrudes a little above the cylinder so that it is constantly pressurized by the reservoir.
  • the pressure of the compressed air reservoir is also constantly applied to the first piston body from below.
  • the same effective pressure is applied to the upper effective surface of the annular piston via one or more bores, which prevails in the chamber above the first piston body.
  • This chamber is acted upon in a known manner with the help of a pilot valve with either atmospheric pressure or the pressure of the compressed air source.
  • both piston bodies move down together into the closed position. Due to the pressure difference prevailing at the valve seat element, the valve seat element also follows this movement. As a result, the outlet remains closed until the valve seat element hits the lower stop. Since the piston bodies continue to move downward by a certain amount, the outlet is now open and the air in the cylinder can be pushed out into the open during the return stroke of the working piston.
  • the valve arrangement according to the invention is not only particularly simple, but also operates with very little wear. There is no heavy stress on polymeric sealing elements. The mechanical stress on the valve parts is also extremely low.
  • the pneumatic nailer shown in FIG. 1 consists of a housing part 1, a handle part 2 and a magazine part 3.
  • An interior 4 of the handle part 2 represents a compressed air reservoir for receiving and providing compressed air.
  • a working cylinder 5 In the housing 1 there is a working cylinder 5.
  • a brake ring 6 At the lower end of the cylinder 5 there is a brake ring 6, which limits the stroke of a working piston 7 and eliminates kinetic energy not consumed by the driving process of a fastening means.
  • a plunger 8 is attached to the piston 7 and is guided in an axial extension in the firing channel 9.
  • In the lower half of the cylinder 5 is coaxially surrounded by a space 32 which is filled in the lower position of the working piston 7 through holes 10 in the cylinder 5 with compressed air, which is used for returning the working piston 7.
  • the lower space of the housing 1 is sealed at the bottom 11 by a plug-like element 12 made of polyurethane, which at the same time serves to guide the driving plunger 8.
  • the housing 1 is closed by a cap 13.
  • the middle part of the cap 13 has a blind bore 14 for receiving and guiding a valve seat element 15.
  • a wire filter 30 is arranged coaxially around the middle part of the cap 13 for soundproofing of emerging air via the outlet duct 30a.
  • an intermediate piece 17 is inserted sealingly in a cylindrical recess 50 of the housing 1. It has a sleeve-like extension 18.
  • a main valve 20 has a first valve piston 21, which is sealingly guided in the recess 50 below the intermediate piece 17.
  • the disk-shaped piston body 21 has a lower active surface 33 which is constantly subjected to the pressure in the compressed air reservoir 4.
  • an annular piston 22 can be moved in a sealing and sliding manner.
  • the facing the working cylinder End face of the annular piston 22 has two active surface sections.
  • An inner active surface section 37A sealingly cooperates with the front end 16 of the cylinder 5.
  • An active surface section 37B of the annular piston 22 lying radially further outward is formed by the section of the annular piston 22 which projects beyond the cylinder 5 and to which the pressure in the reservoir 4 is applied.
  • the ring piston 22 is thus limited in its axial movement upwards by the valve piston 21.
  • the annular piston 22 can be moved freely downward relative to the valve piston 21. However, its downward movement is limited by the working cylinder.
  • the first piston body 21 has a sleeve-shaped neck 19 which cooperates in a sealing and sliding manner with the sleeve-shaped extension 18 of the intermediate piece 17.
  • a compression spring 41 is arranged, which cooperates with the top of the disc-shaped piston body 21 and constantly tries to press it down.
  • a control chamber 23 is formed between the intermediate piece 17 and the first piston body 21 and is connected via a bore 24 to a pilot valve 25 which has a valve rod 26 which is actuated by a release lever 27.
  • the structure of the pilot valve 25 is not explained in detail since it is generally known.
  • the upper piston body 21 has a plurality of through holes 36.
  • the annular piston 22 has an annular groove 35 in the upper active surface. In this way, the pressure of the control chamber 23 also prevails on the upper active surface of the annular piston 22.
  • the sleeve-shaped valve seat element 15 has a lower radial flange 52 which limits the upward movement of the valve seat element 15 into the bore 14. In this way, the lower effective area of the valve seat element 15 also becomes larger than the upper one.
  • the trigger lever 27 In the rest position of the pneumatic nailer shown in FIG. 1, the trigger lever 27 is not actuated.
  • the valve rod 26 is in a lower position.
  • the compressed air from the reservoir 4 can enter the control chamber 23 via the bore 24.
  • the upper active surface 31 of the piston body 21 In the control chamber 23, the upper active surface 31 of the piston body 21 is pressurized with compressed air.
  • the downward-acting force is reduced by the upward-acting force which arises from the application of the annular surface 33.
  • the annular piston 22 is acted upon with a greater effective force downward in sealing engagement with the cylinder 5.
  • valve rod 26 is raised.
  • the compressed air from the reservoir 4 can no longer reach the control chamber 23 via the bore 24, but rather is connected to the atmosphere. This results in a pressure reduction in the control chamber 23.
  • the pressure on the active surfaces 33, 37B gains the upper hand in order to bring these parts into the open position.
  • FIG. 2 shows the opening phase in which the annular piston 22 is still in engagement with the cylinder 4, but the first piston body 21 is already in sealing engagement with the valve seat element 15.
  • both valve bodies 21, 22 are in the open position, and the working piston 7 is at the beginning of a working stroke.
  • Fig. 4 shows the piston 7 at the end of its working stroke (not shown). In this position, the space 32 is filled with compressed air via the bores 10 in the cylinder 5. This compressed air is used for returning the working piston 7 to its starting position.
  • the valve rod 26 has already returned to its lower position, which happens automatically as soon as the release lever 27 is released. As a result, the connection of the compressed air reservoir 4 to the space 23 is restored.
  • Fig. 4 shows the entry of compressed air into the control chamber 23 shortly before the closing movement of the main valve. The valve bodies 21, 22 are moved back into the closed position as soon as the pressure in the control chamber 23 has risen sufficiently.
  • valve seat element 15 also follows the movement of the valve body 21, so that the outlet 30a remains shut off.
  • the valve seat element 15 and the neck of the valve body 21 are not separated until the valve seat element 15 abuts against the intermediate piece 17.
  • the force relationships on the valve seat element 15 are reversed and the compressed air in the cylinder chamber pushes it back into the upper position (according to FIGS. 1 to 3).
  • the outlet is thus opened and the working piston 7 can push the compressed air out of the cylinder.
  • the cylinder returns to the starting position with the aid of the compressed air stored in the space 32, as shown in FIG. 1. This completes a work cycle.

Claims (6)

1. Disposition de soupape pour un cloueur à air comprimé, comprenant un piston (20) de soupape (pièce de fermeture de la soupape d'admission et d'évacuation pour la chambre de travail), qui est guidé au-dessus du cylindre de travail avec possibilité de coulissement axial suivant le même axe et qui, dans sa position inférieure (position de fermeture), arrête l'alimentation en air comprimé de la chambre de travail, et, dans sa position supérieure (position d'ouverture), ferme un canal d'évacuation, lequel est relié, par l'intermédiaire d'un perçage (19) dans le piston de soupape, à la chambre de travail et présente une surface active (33) inférieure, constamment sollicitée par la pression de la source (4) d'air comprimé, et une surface active (31) supérieure plus grande, pouvant être exposée, au choix et à l'aide d'une soupape de précom- mande (25), à la pression atmosphérique ou à la pression de la source d'air comprimé, un élément (15) de siège de soupape en forme de douille qui est guidé en pouvant coulisser longitudinalement avec étanchéité dans un perçage (14) et dont le mouvement est limité par des butées supérieure (52) et inférieure, dont le perçage communique avec celui du piston de soupape et qui comporte une première surface active éloignée du piston de soupape et une deuxième surface active tournée vers le piston de soupape, la surface active citée en deuxième étant plus grande, disposition dans laquelle le piston de soupape, quand il est dans sa position supérieure (position d'ouverture), s'applique de façon étanche contre la deuxième surface active de l'élément de siège de soupape, celui-ci étant dans sa position de butéesupérieure, et le piston de soupape présente d'autre part, quand il est dans sa position inférieure (position de fermeture), un certain écartement vis-à-vis de la deuxième surface active de l'élément de siège de soupape, celui-ci étant dans sa position de butée inférieure, la susdite disposition étant caractérisée en ce que le piston de soupape (20) comporte un premier corps de piston (21), lequel comprend le perçage ainsi que les surfaces actives inférieure et supérieure (31, 33) et coopère avec l'élément de siège (15) de soupape, en ce qu'un deuxième corps de piston annulaire (22) repose, en pouvant coulisser axiaiement avec étanchéité, dans un évidement annulaire, tourné vers la chambre de travail, du premier corps (21) de piston, et une surface active, éloignée de la cylindrée de travail, du deuxième corps (22) de piston est reliée, par l'intermédiaire d'au moins un perçage (36), à la surface active supérieure (31 ) du premier corps de piston (21), tandis qu'une portion (37A) de surface active inférieure du deuxième corps de piston coopère, de façon étanche, avec le cylindre de travail et qu'une autre portion (37B) de surface active est constamment sollicitée vers la position inférieure (position de fermeture) par la pression de la source d'air comprimé, et en ce que le rapport des surfaces actives des deux corps (21, 22) de piston est tel que, lors d'une réduction de la pression sur la surface active supérieure (31 ) du premier corps de piston, le premier corps de piston (21 ) est amené d'abord dans la position supérieure et ensuite, pour une plus basse pression, le deuxième corps de piston (22).
2. Disposition de soupape selon la revendication 1, caractérisée en ce que les deux portions (37A, 37B) de surface active sont formées par une surface frontale du deuxième corps (22) de piston.
3. Disposition de soupape selon la revendication 1 ou 2, caractérisée en ce que le mouvement du deuxième corps (22) de piston est limité vers le haut par le premier corps (21 ) de piston, et vers le bas par l'extrémité supérieure du cylindre (5).
4. Disposition de soupape selon l'une des revendications 1 à 3, caractérisée en ce qu'une rainure annulaire (35) est ménagée dans la surface active supérieure du deuxième corps (22) de piston.
5. Disposition de soupape selon l'une des revendications 1 à 4, caractérisée en ce qu'une saillie (19) en forme de douille du premier corps (21) de piston est guidée de façon coulissante et étanche dans une saillie (18) en forme de douille d'un élément de couverture (17).
6. Disposition de soupape selon la revendication 5, caractérisée en ce qu'elle comporte un élément de couverture séparé (17), qui est placé de façon à assurer l'étanchéité dans un évidement cylindrique de l'enveloppe, son déplacement vers le haut étant limité par un couvercle et un ressort de compression (41 ) étant disposé entre l'élément de couverture et le premier corps (21 ) de piston.
EP85107700A 1985-06-21 1985-06-21 Assemblage de soupape Expired EP0205633B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8585107700T DE3561503D1 (en) 1985-06-21 1985-06-21 Valve assembly
AT85107700T ATE32194T1 (de) 1985-06-21 1985-06-21 Ventilanordnung.
EP85107700A EP0205633B1 (fr) 1985-06-21 1985-06-21 Assemblage de soupape
US06/776,675 US4667572A (en) 1985-06-21 1985-09-16 Valve arrangement
JP60249920A JPS61293622A (ja) 1985-06-21 1985-11-06 バルブ装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP85107700A EP0205633B1 (fr) 1985-06-21 1985-06-21 Assemblage de soupape

Publications (2)

Publication Number Publication Date
EP0205633A1 EP0205633A1 (fr) 1986-12-30
EP0205633B1 true EP0205633B1 (fr) 1988-01-27

Family

ID=8193572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107700A Expired EP0205633B1 (fr) 1985-06-21 1985-06-21 Assemblage de soupape

Country Status (5)

Country Link
US (1) US4667572A (fr)
EP (1) EP0205633B1 (fr)
JP (1) JPS61293622A (fr)
AT (1) ATE32194T1 (fr)
DE (1) DE3561503D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208693A (ja) * 2012-03-30 2013-10-10 Hitachi Koki Co Ltd 打込機

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DE3762196D1 (de) * 1987-07-01 1990-05-17 Behrens Ag Friedrich Joh Pneumatisch betaetigtes eintreibgeraet fuer befestigungsmittel.
DE3831607A1 (de) * 1988-09-17 1990-03-22 Haubold Kihlberg Gmbh Durch druckluft betriebenes schlaggeraet mit entlueftungsventil fuer das hauptventil
JPH07112674B2 (ja) * 1990-01-10 1995-12-06 株式会社マキタ 空気圧式釘打機のヘッドバルブ装置
US5217153A (en) * 1992-10-21 1993-06-08 Hitachi Koki Co., Ltd. Driving machine having cylinder fixing arrangement
CA2158802A1 (fr) * 1994-10-06 1996-04-07 Timothy R. Mcgreal Outil d'ancrage pneumatique
JPH09507172A (ja) * 1994-10-21 1997-07-22 センコ プロダクツ、インコーポレーテッド 圧縮空気駆動のファスナ打込機／その電子制御システム
US5476205A (en) * 1994-12-22 1995-12-19 Stanley-Bostitch, Inc. Make and break head valve assembly
JP3240923B2 (ja) * 1996-05-10 2001-12-25 日立工機株式会社 多数回打撃式打込機
US5706996A (en) * 1997-01-21 1998-01-13 De Poan Pneumatic Corporation Stapler gas exhaust system
JP3346218B2 (ja) * 1997-04-18 2002-11-18 日立工機株式会社 打込機の排気装置
US7156012B2 (en) * 2004-01-20 2007-01-02 Hitachi Koki Co., Ltd. Pneumatically operated fastener driving tool
JP4996044B2 (ja) * 2004-07-09 2012-08-08 日立工機株式会社 打込機
JP4650610B2 (ja) * 2004-08-19 2011-03-16 マックス株式会社 圧縮空気釘打機のメインバルブ機構
US20070152013A1 (en) * 2006-01-05 2007-07-05 Hao Cheng Technology Corp. Nail gun back cover
US20080148697A1 (en) * 2006-12-20 2008-06-26 Chia Sheng Liang Filter for Nail Gun
TWI387514B (zh) * 2010-09-20 2013-03-01 Basso Ind Corp High pressure nail gun that eliminates exhaust noise
CA3146951A1 (fr) 2014-03-27 2015-10-01 Techtronic Power Tools Technology Limited Dispositif d'entrainement d'attache motorise et son procede de fonctionnement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208693A (ja) * 2012-03-30 2013-10-10 Hitachi Koki Co Ltd 打込機

Also Published As

Publication number Publication date
DE3561503D1 (en) 1988-03-03
EP0205633A1 (fr) 1986-12-30
US4667572A (en) 1987-05-26
ATE32194T1 (de) 1988-02-15
JPS61293622A (ja) 1986-12-24
JPH0347939B2 (fr) 1991-07-22

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