EP0359974B1 - Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil - Google Patents

Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil Download PDF

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Publication number
EP0359974B1
EP0359974B1 EP89114695A EP89114695A EP0359974B1 EP 0359974 B1 EP0359974 B1 EP 0359974B1 EP 89114695 A EP89114695 A EP 89114695A EP 89114695 A EP89114695 A EP 89114695A EP 0359974 B1 EP0359974 B1 EP 0359974B1
Authority
EP
European Patent Office
Prior art keywords
valve
piston
venting
main valve
impacting apparatus
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
EP89114695A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0359974A2 (de
EP0359974A3 (de
Inventor
Theodor Heidrich
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.)
Haubold Befestigungstechnik GmbH
Original Assignee
Haubold Befestigungstechnik GmbH
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 Haubold Befestigungstechnik GmbH filed Critical Haubold Befestigungstechnik GmbH
Publication of EP0359974A2 publication Critical patent/EP0359974A2/de
Publication of EP0359974A3 publication Critical patent/EP0359974A3/de
Application granted granted Critical
Publication of EP0359974B1 publication Critical patent/EP0359974B1/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
    • B25C1/041—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

Definitions

  • the invention relates to a pneumatic impact device according to the preamble of claim 1.
  • the pressure of the working medium air can raise the main valve as soon as its upper side, that is the side facing away from the working cylinder, is relieved of the compressed air, which is also present here.
  • the compressed air is supplied to the top of the main valve via a connecting channel, at the opposite end of which the air access can be controlled by a release valve. With the device at rest the top of the main valve is pressurized with compressed air. As soon as a working stroke is to be drawn, the top of the valve is relieved of the compressed air.
  • the connecting channel which ensures that the top of the valve is acted upon, is vented through vent holes.
  • the triggering valve of the implement which connects the connection channel with ventilation holes in the triggering valve in the operating position, provides for the ventilation.
  • EP-A-0 052 368 shows a known embodiment of an impact device, in which a connecting channel in the form of a pipe piece is also used to conduct compressed air to the top of the main valve deflected an additional device and passed through a hole back into the housing interior and on the top of the main valve.
  • the additional device consists of a valve in the form of a cover-like housing with a central opening.
  • a valve plate made of flexible material of spherical shape is arranged within the space formed thereby. In the starting position, the valve plate rests in a correspondingly shaped curvature of the housing cover and is pressed upwards against a ventilation hole by compressed air from the connecting channel.
  • GB-A-2 188 582 shows an impact device of the type mentioned at the outset, in which the venting valve, which can be controlled by the release valve, is pressed into the closed position in the form of a stepped piston by compressed air, supported by a helical spring.
  • the compressed air acting on the upper side of the cover-like main valve is guided along the stepped piston during the closed position of the vent valve and bores branching through its movement space into the movement space above the main valve.
  • the flow resistance is high.
  • the stepped piston with its long length and mass due to its design must be pushed back against the force of the coil spring and against the air pressure acting on a central collar. This process can therefore not be done at the desired speed. The result is a less rapid opening of the main valve; combined with a correspondingly lower impact force of the working piston.
  • the top of the main valve is also constantly pretensioned by a valve closing spring in these designs. It must ensure that the main valve is kept closed in the rest position - even before the device is connected to a compressed air line. In this way, an undesired triggering of a driving impact of the piston and the associated risk of injury are avoided.
  • the stress on the valve closing spring increases with the speed of the valve movements. Broken valve springs are therefore often the result. They lead to destruction of the neighboring parts of the device and are therefore a safety risk that must be taken into account when increasing the impact.
  • the invention has for its object to provide an impact device according to the generic term mentioned above, the impact force is increased compared to previously known designs.
  • the invention solves the problem with the features of claim 1.
  • the stepped piston is preferably provided with a conical chamfer, which is pressed into an elastic sealing ring surrounding the ventilation opening while the piston is in the closed position.
  • a cylinder liner for piston guidance is preferably inserted into the cylindrical extension receiving the stepped piston.
  • the stepped piston has an annular surface which, in cooperation with the compressed air, provides the necessary thrust when triggering a working stroke.
  • annular disk spring made of plastic, which consists, for example, of polyurethane as the valve closing spring. It is of simple design and withstands the alternating loads with high accelerations better than one of the usual metal springs. Despite an increase in the speed of the alternating movements of the main valve, the safety risk of a spring break is avoided.
  • the working cylinder 2 with the working piston 3 is arranged in the head region of the device housing 1.
  • the working plunger 4 is attached to the underside of the working piston.
  • the device housing 1 is closed in its head area by a housing cover 5, in which the main valve 6 is located. It is guided within a ring insert 7 and through partial contact with the walls of the housing cover.
  • the space 8 inside the housing cover serves as freedom of movement for carrying out the valve movements. Via a central bore 9 and housing bores 10 communicating therewith, the cylinder space can be vented during the return stroke of the working piston.
  • a valve closing spring 11 in the form of a conical disc spring is arranged between the top of the main valve and the housing cover 5.
  • the freedom of movement 8 above the main valve is connected to the release valve 13 via a connecting channel 12.
  • the connecting channel 12 passes through the compressed air supply space 15 in the device housing.
  • the trigger valve 13 consists of a cylindrical insert with a compressed air bore 16 and a valve piston 17, which is provided with longitudinal ventilation grooves, via which the connecting channel 12 can be vented to the outside.
  • the release piston 17 In its lower end position, i.e. when the release lever 18 is relieved, the release piston 17 is in its lower end position, so that the compressed air bore 16 can communicate with the connection channel 12 via connection bores 20 and the annular space 19.
  • the connecting channel 12 is vented via the annular space 19 and the connecting bores 20 of the trigger valve in connection with the longitudinal grooves of the valve piston 17.
  • the cylindrical widening 21 is connected to the outside air via a vent hole 24.
  • the stepped piston is provided with a central vent hole 25, 25a, which opens laterally into an annular space 26 which is formed by the stepped piston in its area of smaller diameter with the wall of the cylindrical widening 21.
  • the stepped piston is equipped with a sealing ring 27 in its larger diameter range.
  • the stepped piston is provided with a conical chamfer 28 which engages in a sealing ring 29 as soon as the stepped piston reaches its upper end position.
  • the transition from the smaller diameter to the larger diameter of the stepped piston forms an annular surface 30, as a result of which the force required for displacement can be formed more quickly when the connecting channel 12 is vented.
  • the ring surface thus ensures a very fast switching movement of the stepped piston.
  • the movable parts are each shown half in the starting position and in the operating position.
  • the starting position is shown from the left half of the picture.
  • the main valve is in the lower position while the stepped piston 23 has reached the upper position (FIG. 2). It engages with its conical end in the sealing ring 29 and closes off the vent opening 24.
  • the pressure of the compressed air reservoir 15 in the housing 1 continues via the connecting channel 12, the cylindrical extension 21 into the movement space 8 above the main valve and loads it in the closed position.
  • the trigger lever 18 As soon as the trigger lever 18 is pulled, it pushes the valve piston 17 into its upper position. As a result, the connecting channel 12 is vented. The pressure above the main valve affects the step piston and pushes it into its lower position. The vent 24 is released and the freedom of movement above the main valve is relieved of pressure by a short circuit with the outside air. At this moment The air pressure of the compressed air supply space 15 can push the main valve 6 almost suddenly into its upper end position, the force of the valve closing spring 11 being overcome. The compressed air thus has access to the working cylinder on all sides and acts on the working piston 3, which is suddenly driven into its lower position. After the release lever 18 has been released, the underside of the stepped piston 23 can be loaded again and this can be pushed into its upper end position. The pressure continues again into space 8 above the main valve and can load it in the closing direction.
  • valve closing spring 11 is the greater durability compared to conventional springs.
  • the contact surface can be provided with a radially guided groove 31 (FIG. 2). This definitely prevents the formation of a vacuum between the valve spring and the housing cover.
  • the valve closing spring 11 can not suck up. The same effect is achieved if the valve closing spring 11 itself is provided with a radially extending groove 11a or a simple bore 11b (FIGS. 5b and 5c).

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP89114695A 1988-09-17 1989-08-09 Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil Expired - Lifetime EP0359974B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3831607 1988-09-17
DE3831607A DE3831607A1 (de) 1988-09-17 1988-09-17 Durch druckluft betriebenes schlaggeraet mit entlueftungsventil fuer das hauptventil

Publications (3)

Publication Number Publication Date
EP0359974A2 EP0359974A2 (de) 1990-03-28
EP0359974A3 EP0359974A3 (de) 1991-07-03
EP0359974B1 true EP0359974B1 (de) 1995-05-17

Family

ID=6363127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114695A Expired - Lifetime EP0359974B1 (de) 1988-09-17 1989-08-09 Durch Druckluft betriebenes Schlaggerät mit Entlüftungsventil für das Hauptventil

Country Status (3)

Country Link
US (1) US5014898A (cs)
EP (1) EP0359974B1 (cs)
DE (2) DE3831607A1 (cs)

Families Citing this family (447)

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DE3831607A1 (de) 1990-03-22
DE3831607C2 (cs) 1992-11-12
DE58909233D1 (de) 1995-06-22
US5014898A (en) 1991-05-14
EP0359974A2 (de) 1990-03-28
EP0359974A3 (de) 1991-07-03

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