EP0359974A2 - Outil de scellement pneumatique avec soupape de décharge dans la soupape de contrôle - Google Patents

Outil de scellement pneumatique avec soupape de décharge dans la soupape de contrôle Download PDF

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Publication number
EP0359974A2
EP0359974A2 EP89114695A EP89114695A EP0359974A2 EP 0359974 A2 EP0359974 A2 EP 0359974A2 EP 89114695 A EP89114695 A EP 89114695A EP 89114695 A EP89114695 A EP 89114695A EP 0359974 A2 EP0359974 A2 EP 0359974A2
Authority
EP
European Patent Office
Prior art keywords
valve
piston
impact device
connecting channel
main valve
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
EP89114695A
Other languages
German (de)
English (en)
Other versions
EP0359974B1 (fr
EP0359974A3 (fr
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/fr
Publication of EP0359974A3 publication Critical patent/EP0359974A3/fr
Application granted granted Critical
Publication of EP0359974B1 publication Critical patent/EP0359974B1/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
    • B25C1/04—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 compressed air-operated impact device, in particular for driving in fasteners, such as clamps and nails, with a housing for receiving a working piston guided in a cylinder and a cover-like main valve controlling the release and closing of the entire cylinder cross section, the top side of which via one to one Release valve leading connecting channel can be acted upon with compressed air and which is constantly under the pretension of a valve spring acting in the closing direction, the release valve being provided with ventilation channels for the connecting channel.
  • 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.
  • 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.
  • the outflow of compressed air from the top of the valve via the connecting channel with multiple deflections is naturally made more difficult by flow resistances.
  • the pressure on the top of the valve is therefore not abruptly reduced to the desired extent.
  • the main valve cannot lift off at the desired acceleration.
  • the inflow of compressed air into the working cylinder is delayed in a corresponding manner, so that the working piston also does not reach the desired high initial acceleration and thus final speed.
  • the top of the valve is also constantly pretensioned by a valve closing spring. 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. This prevents an undesired triggering of a driving impact of the piston and the associated risk of injury.
  • the spring load increases with the speed of the valve movements. Broken valve springs are therefore often the result. They destroy the neighboring parts of the device and are therefore a safety risk.
  • the invention has for its object to provide a striking device according to the generic term mentioned, the impact force is increased compared to previously known designs and in which the valve closing spring is designed in detail with the increase in stress so that greater durability and a safety risk is avoided by the faster valve movements.
  • the solution according to the invention is characterized in that a vent valve which can be controlled by the pressure in the connecting channel in cooperation with the pressure on the upper side of the main valve is additionally arranged in the region of the junction of the connecting channel in a movement space above the main valve. It is thereby achieved that the compressed air can escape very quickly after the actuation of the release valve from the free space above the main valve, that is to say in a short circuit, since the outflowing compressed air is only opposed by a very low line resistance.
  • the compressed air is no longer forced to travel the long way back through the connecting duct via the release valve.
  • the main valve can be lifted off its seat on the working cylinder more quickly.
  • the inflow cross section is completely released for the inflow of compressed air in a shorter time unit.
  • the working piston is acted upon very quickly, ie almost suddenly by the working pressure of the compressed air, and can achieve a very high initial acceleration, so that the final speed on which the impact pulse depends is very high.
  • a stepped piston with a ventilation hole for the main valve and with a seal in its larger diameter range within a cylindrical extension of the connecting channel with a lateral bore to the free space of the main valve, the cylindrical extension leading to the outside, which can be closed by the stepped piston Has ventilation opening.
  • the ventilation Bore can start from the piston end facing the release valve and open into an annular space formed by the stepped piston and the piston guide.
  • the vent opening is closed at the end by the step piston.
  • 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 a working stroke is triggered.
  • annular disk spring made of plastic, for example made 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.
  • a working cylinder 2 with a working piston 3 is arranged in the head region of the device housing 1.
  • a working plunger 4 is attached to the underside of the working piston.
  • the device housing 1 is closed in its head region 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 5 serves as freedom of movement for carrying out the valve movements.
  • the cylinder space can be vented during a return stroke of the working piston via a central bore 9 and housing bores 10 communicating therewith.
  • 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 compressed air is supplied to the storage space 15 via the connecting piece 40 for a supply line, not shown.
  • a magazine 41 for receiving fastening means for example clips. They are after insertion into the magazine by a piston, the actuating handle is designated 42, under the action of the force of a spring 43 to the front in an input channel 44 pushed. Under the action of the driving or working ram 4, the fastening means are driven out of the driving channel 44 into a workpiece.
  • the trigger valve 13 consists of a cylindrical insert 13a with a compressed air bore 16 and a valve piston 17 which is provided with longitudinal ventilation grooves 17a, via which the connecting channel 12 can be vented to the outside (FIG. 2).
  • the valve piston 17 In its lower end position, i.e. H.
  • the valve piston 17 In its lower end position, i.e. H.
  • the connecting channel 12 is vented via the annular space 19, the transverse bores 20 of the trigger valve in connection with the longitudinal grooves 17a of the valve piston 17.
  • a cylinder liner 22 for a stepped piston 23 can be arranged within a cylindrical extension 21 of the connecting channel 12 (FIG. 2).
  • the cylindrical extension 21 is connected to the outside air via a vent hole 24.
  • the stepped piston 23 is provided with a central vent hole 25, 25a which opens laterally into an annular space 26 which is formed by the stepped piston with the wall of the cylindrical extension 21 in the region of the smaller piston diameter.
  • 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 it 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 necessary for displacement is formed when pressure is applied.
  • the movable parts are each 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 assumes its upper position (FIG. 2). It engages with its conical end 28 in the sealing ring 29 and closes off the vent opening 24.
  • the pressure of the compressed air supply space 15 in the housing 1 continues via the connecting channel 12, the cylindrical extension 21 into the movement space 8 above the skin valve 6 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).
  • the formation of a vacuum between the valve spring and the This reliably prevents the housing cover.
  • the valve closing spring 11 can not suck up.
  • the valve closing spring 11 itself is provided with a radial groove 11a or a simple bore 11b (FIGS. 5b and 5c)

Landscapes

  • 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 Outil de scellement pneumatique avec soupape de décharge dans la soupape de contrôle Expired - Lifetime EP0359974B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=6363127

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114695A Expired - Lifetime EP0359974B1 (fr) 1988-09-17 1989-08-09 Outil de scellement pneumatique avec soupape de décharge dans la soupape de contrôle

Country Status (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4213310A1 (de) * 1992-04-23 1993-10-28 Haubold Kihlberg Gmbh Druckluftbetriebenes Schlaggerät mit Ventilsicherung
EP0683015A1 (fr) * 1994-05-18 1995-11-22 Stanley-Bostitch, Inc. Contrôle de l'énergie pour un dispositif d'enfoncement d'éléments de fixation
EP0705664A1 (fr) * 1994-10-06 1996-04-10 Illinois Tool Works Inc. Outil d'enforcement pneumatique pour des moyens de fixation

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* Cited by examiner, † Cited by third party
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US6260519B1 (en) * 1997-12-31 2001-07-17 Porter-Cable Corporation Internal combustion fastener driving tool accelerator plate
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US6041603A (en) * 1997-12-31 2000-03-28 Porter-Cable Corporation Internal combustion fastener driving tool accelerator plate
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Also Published As

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DE3831607A1 (de) 1990-03-22
EP0359974B1 (fr) 1995-05-17
US5014898A (en) 1991-05-14
DE3831607C2 (fr) 1992-11-12
EP0359974A3 (fr) 1991-07-03
DE58909233D1 (de) 1995-06-22

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