EP0600206B1 - Treiberabdichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln - Google Patents

Treiberabdichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln Download PDF

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Publication number
EP0600206B1
EP0600206B1 EP93116927A EP93116927A EP0600206B1 EP 0600206 B1 EP0600206 B1 EP 0600206B1 EP 93116927 A EP93116927 A EP 93116927A EP 93116927 A EP93116927 A EP 93116927A EP 0600206 B1 EP0600206 B1 EP 0600206B1
Authority
EP
European Patent Office
Prior art keywords
sealing device
piston
stop member
opening
tool
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 - Lifetime
Application number
EP93116927A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0600206A1 (de
Inventor
Joachim Bauer
Klaus Albrecht
Rolf Krahmer
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
Publication of EP0600206A1 publication Critical patent/EP0600206A1/de
Application granted granted Critical
Publication of EP0600206B1 publication Critical patent/EP0600206B1/de
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
    • B25C1/04—Hand-held nailing tools; Nail feeding devices operated by fluid pressure, e.g. by air pressure
    • B25C1/047—Mechanical details

Definitions

  • the invention relates to a driver seal on a device operated with compressed air for driving in fasteners according to the preamble of claim 1.
  • the working stroke is effected by connecting the working stroke space above a working piston with compressed air.
  • the air is displaced below the working piston into a piston return chamber, which is fed via a first opening near a stop and a second opening at a distance from the stop becomes.
  • the second opening can be designed as a check valve with a radial bore in the cylinder wall surrounding a rubber ring. If the working piston has reached bottom dead center with the stop and the working stroke space is connected to the atmosphere, the air stored in the piston return space can drive the working piston back to its top dead center.
  • the alternating connection of the working stroke space with compressed air or atmosphere is effected by a control valve and is described in EP-B 0 326 639 for a device that enables single-shot operation and automatic operation.
  • the driving plunger must be guided more or less sealingly from the cylinder into the muzzle tool.
  • the driving plunger penetrates a gap of the stop that surrounds this very closely.
  • this has the disadvantage that residual air can remain below the working piston, which hinders the driving in of fasteners in rapid succession.
  • the slot of the elastic stop can expand due to a load from the metallic plunger, caused by the axial compression of the stop when the piston strikes, and impair the required sealing effect.
  • the sealing element is designed as a disk which is separate from the buffer and is made of a metallic material.
  • the disc is held between the stop and a head piece at the bottom of the cylinder and guides the plunger in a narrow slot.
  • a ventilation groove is provided in the driving channel of the mouth tool to allow the residual air to escape.
  • the vent groove opens at one end on a passage of the stop and extends with the other end into the range of motion of the driving plunger end in the mouth tool. If the piston is at top dead center, residual air can escape through the ventilation duct into the range of motion of the tappet and from there through the drive-in duct.
  • the driving tappet completely and sealingly covers the ventilation groove after a short movement distance, as a result of which the tappet seal is made towards the muzzle tool and the return air can be stored.
  • the sealing of the muzzle tool to the working cylinder is problematic.
  • the squeezing with exact leveling of the plate-shaped parts of the muzzle tool is difficult to control in terms of production technology.
  • a head piece in a bore can have a driver guide and seal which is separate from the buffer and against which the mouth tool is pressed in a sealing manner from the outside. It is not necessary to squeeze the muzzle tool here.
  • the plate-shaped parts of the same must also be leveled exactly so that they form a flat contact surface for the driver guide made of plastic.
  • a driving tool for nails in which the housing, a head piece closing it below the working cylinder and a mouth piece are made separately and each in one piece from cast iron.
  • the driving plunger is sealingly guided through an opening in the head piece, which has ventilation grooves.
  • the head piece carries and guides an elastic stop for the working piston.
  • the object of the invention is to improve the driver seal of the type mentioned at the outset in such a way that it can be manufactured more easily with sufficient sealing action and release of residual air.
  • the elastic stop has a receptacle into which a connecting section of the mouth tool is inserted in a sealing manner under elastic prestress.
  • the receptacle is located in the extension of the feedthrough and the connecting section contains the drive-in channel, so that the drive-in tappet reaches the drive-in channel in the connection area from the feedthrough.
  • the sealing connection ensures that compressed air in the space under the piston does not escape to an undesirable extent along the driving plunger. It is understood that the ventilation groove for opening the stop is open to allow residual air to escape through a free partial cross section of the opening when the piston is near top dead center.
  • the driver seal according to the invention has the advantage that it is relatively inexpensive to manufacture, because it is only an indentation of the connecting section in the elastic receptacle.
  • the sealing can take place above all on the sides of the connecting section which are directed parallel to the axis of movement of the driving plunger. In order to achieve the sealing effect, it is therefore not important in the case of a divided mouth tool in plate form that the individual plates are exactly aligned with one another in the direction of movement.
  • the invention has the advantage that, in addition to simplified assembly, the additional component made of plastic is eliminated.
  • the advantages of the invention can essentially also be used if the stop is constructed in several parts, wherein the parts can have different supports in the cylinder.
  • the recording has a rectangular cross section.
  • the connecting section can be supported on the end face at an inner step between the receptacle and bushing and / or with an outer step next to the connecting section at the edge of the receptacle.
  • the inner step and / or the outer step can extend perpendicular to the plate plane thereof.
  • the stop can pass through a slot-shaped passage.
  • the stop can be supported on a head piece detachably connected to the working cylinder, which has an opening for connecting the stop and the muzzle tool.
  • the working cylinder When the head piece is removed, the working cylinder is accessible from the outside.
  • the head piece is designed as a stop near the edge with a step below a step with an external thread for screw fastening.
  • the muzzle tool can have a support and / or attachment on the side of the head piece.
  • the stop In order to influence the damping properties, the stop can be approximately cylindrical and, facing the working piston, have a central bore running over part of its height. For the same reason, the stop in its upper edge area can be tapered towards the working piston.
  • the bore or taper requires cavities in the working cylinder, into which the stop can deform, consuming the impact energy when the working piston hits it. The deformation of the stop is essentially kept away from the sealing seat of the muzzle tool in the receptacle, so that it is not impaired after prolonged dynamic stress.
  • FIG. 1 and 2 show essentially only the driver seal a pneumatically operated device for driving fasteners. This is located at the lower end of a working cylinder 1 for a working piston (not shown) which is surrounded by a piston return chamber 2, which in turn encloses a housing 3. Of the first and second openings between the working cylinder 1 and the piston return chamber 2, only the first openings 4 are shown as radial bores in the vicinity of a stop 5.
  • the stop 5 is designed as an elastic body made of plastic and is provided towards the piston with a bore 6 which extends over approximately half its height. In adaptation to the working cylinder 1, it essentially has a cylindrical outer contour, but has a conical taper 7 towards the upper end region. At the bottom, the stop 5 is held by a head piece 8 in the working cylinder 1, which is designed as an enclosure with a screw thread 9 and with a step 10 on the inner edge engages in an inner step 11 of the stop.
  • the head piece 8 leaves an end face of the stop 5 uncovered, in which a receptacle 12 is located.
  • the receptacle 12 is aligned with a through slot 13 of the stop 5, which is penetrated by a driving plunger 14 connected to the working piston with a leaf shape.
  • the feed-through slot 13 is dimensioned such that its cross-sectional part not penetrated by the driving plunger 14 is sufficient for venting the working cylinder 1.
  • a muzzle tool 15 consisting of two plate-shaped tool parts 15 ′, 15 ′′ with a connecting section 16 is inserted into the receptacle 12.
  • the tool parts 15 ′, 15 ′′ are fastened to one another by means of screws 17 and fixed on the head piece 8.
  • the tool part 15 ′′ has an opening 18 into which a magazine 19 opens with a clip carrier 20, a clip cover 21 and clips 22 located between them.
  • the opening 18 is formed into a drive-in channel 23 between the two tool parts 15 ', 15''.
  • the lower end of the driving plunger 14 is threaded into the driving channel, for which purpose the upper end of the driving channel 23 has a conical widening 24 towards the through slot 13.
  • a ventilation groove 25 opens out, which is formed along part of the drive channel 23 in the plate-shaped tool part 15 '.
  • the vent groove 25 ends a short distance below End of the driving plunger 14, which is held in the position shown by an upper dead center piston.
  • the lower end of the ventilation channel 25 is located approximately at the level of the upper edge of the magazine opening 18.
  • the mouth tool 15 is supported on the end face of its connecting section 16 on an inner step 26 between the receptacle 12 and the feed-through slot 13.
  • an outer step 27 extends in the transverse direction of the plate tool and is supported next to the connecting section 16 at the edge of the receptacle 12.
  • both tool parts 15 ', 15' ' have support surfaces 28 which load outwards on both sides and which abut the head piece 8 from below.
  • recesses 29 are formed in the region of the stop 5 in the mouth tool 15, which are due to the production technology.
  • a driver seal according to the drawing can be operated as described in EP-B-0 326 639 via a control valve arrangement with a trigger.
  • the driving plunger 14 In the drawn position of the driving plunger 14, residual air can escape from the space below the piston from the cylinder 1 through the bore 6 and through slot 13 as well as the ventilation groove 25 and the driving channel 23.
  • Return air flows into the piston return chamber 2 primarily through a check valve formed in the second openings when the piston is at bottom dead center. When pressure drops above the piston, return air flows through the first openings 4 into the cylinder 1 and drives the piston back to the top dead center. Only when the piston releases the vent groove at the end of the return stroke can residual air escape.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP93116927A 1992-12-02 1993-10-20 Treiberabdichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln Expired - Lifetime EP0600206B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9216394U DE9216394U1 (de) 1992-12-02 1992-12-02 Treiberabdichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln
DE9216394U 1992-12-02

Publications (2)

Publication Number Publication Date
EP0600206A1 EP0600206A1 (de) 1994-06-08
EP0600206B1 true EP0600206B1 (de) 1997-01-15

Family

ID=6886658

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93116927A Expired - Lifetime EP0600206B1 (de) 1992-12-02 1993-10-20 Treiberabdichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln

Country Status (5)

Country Link
US (1) US5511714A (ja)
EP (1) EP0600206B1 (ja)
JP (1) JP2802359B2 (ja)
DE (2) DE9216394U1 (ja)
TW (1) TW227536B (ja)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5628444A (en) * 1995-11-16 1997-05-13 Stanley-Bostitch, Inc. Fastener driving device with main valve/frame valve arrangement
US5669542A (en) * 1996-05-17 1997-09-23 Stanley-Bostitch, Inc. Fastener driving device having full cycle valve
US5911351A (en) * 1998-01-02 1999-06-15 Stanley Fastening Systems, L.P. Pneumatic fastening device having improved nose sealing arrangement
US6631668B1 (en) 2000-11-10 2003-10-14 David Wilson Recoilless impact device
US6763696B1 (en) * 2001-01-17 2004-07-20 Baker Engineering And Risk Consultants, Inc. Shock tube
US20220134525A1 (en) * 2020-10-30 2022-05-05 Milwaukee Electric Tool Corporation Powered fastener driver

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2914032A (en) * 1956-07-23 1959-11-24 Powers Wire Products Company I Air operated tool and control therefor
US3086207A (en) * 1961-04-24 1963-04-23 Signode Steel Strapping Co Pneumatic fastening tool
US3101476A (en) * 1961-09-11 1963-08-27 Fastener Corp Fastener driving apparatus
DE1285959B (de) * 1964-12-28 1968-12-19 Behrens Friedrich Joh Druckluftbetaetigtes Geraet zum Eintreiben von Naegeln, Heftklammern od. dgl.
DE6915710U (de) * 1969-04-19 1969-09-18 Reich Maschf Gmbh Karl Geraet zum einschlagen naegeln oder dergleichen.
US4319705A (en) * 1979-10-31 1982-03-16 Duo-Fast Corporation Fastener driving tool
DE3047662C2 (de) * 1980-12-18 1985-02-21 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Puffersystem bei Einschlaggeräten
DE3119956C2 (de) * 1981-05-20 1984-11-22 Joh. Friedrich Behrens AG, 2070 Ahrensburg Schallgedämpftes Eintreibgerät für Befestigungsmittel
US4867366A (en) * 1984-10-26 1989-09-19 Kleinholz Edward O Pneumatic fastener-driving tool and method
US4657166A (en) * 1985-11-29 1987-04-14 Anstett Edgar P Pneumatically operated nailing machine
DE8801114U1 (de) * 1988-01-30 1988-03-31 Joh. Friedrich Behrens AG, 2070 Ahrensburg Steuerventileinrichtung an einem mit Druckluft betriebenen Gerät zum Eintreiben von Befestigungsmitteln
US5131579A (en) * 1988-03-02 1992-07-21 Max Co., Ltd. Nailing machine
DE3850564D1 (de) * 1988-04-07 1994-08-11 Umberto Monacelli Pneumatisches Befestigungsmitteleintreibgerät.
DE3831864C2 (de) * 1988-09-20 1994-01-27 Paslode Gmbh Ringförmiger Prellpuffer für Befestigungsmittel-Eintreibgeräte
US4932480A (en) * 1988-12-16 1990-06-12 Illinois Tool Works Inc. Driving tool with air-cooled bumper
DE9005447U1 (de) * 1990-05-14 1990-07-19 Joh. Friedrich Behrens AG, 2070 Ahrensburg Mündungswerkzeug für ein Eintreibgerät für Befestigungsmittel

Also Published As

Publication number Publication date
EP0600206A1 (de) 1994-06-08
JP2802359B2 (ja) 1998-09-24
DE9216394U1 (de) 1993-02-11
US5511714A (en) 1996-04-30
JPH06206176A (ja) 1994-07-26
DE59305143D1 (de) 1997-02-27
TW227536B (ja) 1994-08-01

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