EP0297156B1 - Outil d'enfoncement pneumatique pour des moyens de fixation - Google Patents

Outil d'enfoncement pneumatique pour des moyens de fixation Download PDF

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Publication number
EP0297156B1
EP0297156B1 EP87109438A EP87109438A EP0297156B1 EP 0297156 B1 EP0297156 B1 EP 0297156B1 EP 87109438 A EP87109438 A EP 87109438A EP 87109438 A EP87109438 A EP 87109438A EP 0297156 B1 EP0297156 B1 EP 0297156B1
Authority
EP
European Patent Office
Prior art keywords
piston
working
driving
driving tool
tool according
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
EP87109438A
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German (de)
English (en)
Other versions
EP0297156A1 (fr
Inventor
Sigurd Von Seld
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 DE8787109438T priority Critical patent/DE3762196D1/de
Priority to EP87109438A priority patent/EP0297156B1/fr
Priority to AT87109438T priority patent/ATE51790T1/de
Priority to US07/210,235 priority patent/US4856696A/en
Priority to JP63164835A priority patent/JP2603109B2/ja
Publication of EP0297156A1 publication Critical patent/EP0297156A1/fr
Application granted granted Critical
Publication of EP0297156B1 publication Critical patent/EP0297156B1/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
    • B25C1/001—Nail feeding devices
    • B25C1/005—Nail feeding devices for rows of contiguous nails
    • 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
    • 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 pneumatically operated Einteibêt for fasteners according to the preamble of claim 1.
  • a pneumatically operated Einteibêt for fasteners according to the preamble of claim 1.
  • Such a device is known from document DE-A 3 222 949.
  • Pneumatically actuated driving tools for driving nails, staples, pins, sleeves or the like of different lengths and other dimensions are generally known.
  • a space above the working piston in its top dead center position is optionally connected to a compressed air source or to the atmosphere with the aid of a control valve Fastener strikes a workpiece.
  • control valve so that a sequence of driving strokes is triggered as long as an operating lever or the like is operated.
  • a relatively high number of impacts per unit of time can be achieved, so that, for example, U-clamps can be driven into a workpiece in rapid succession.
  • the repeating valve is a relief for the operator. They do not have to release the trigger with every driving stroke and actuate it again for a further driving stroke.
  • the working cylinder is surrounded by a return chamber which is connected to the cylinder via at least two openings.
  • One opening is very close to the stop of the working piston, while the other opening is so far away from the stop that it lies above the working surface of the working piston when it hits the stop. In this way, the compressed air passes through the upper opening into the return chamber and pushes the piston back up through the lower opening to the starting position.
  • the invention has for its object to provide a pneumatically operated fastener driving device that allows pneumatic piston return even with only partially driven fastener.
  • annular piston is arranged below the working piston. It is either a simple screw that sealingly interacts with the lower surface of the working piston; or it has an axial flange which laterally engages around the working piston. In the latter case, the sealing can also take place laterally between the working piston and the annular piston flange.
  • the ring piston works in a sealing manner with the driving plunger and the working piston. However, it can be moved relative to the working piston.
  • the mass and the effective area of the annular piston in relation to the mass of the working piston and plunger and the effective area of the working piston are dimensioned such that the annular piston is advanced together with the working piston when a pressure build-up takes place above the working piston via the control valve.
  • the annular piston does not contribute to driving in the fastener during its downward movement with the working piston. If the fastener is only partially driven in, the kinetic energy of the driving plunger and the piston is used up. That suddenly occurs here Tending deceleration of the plunger leads, however, that the ring piston detaches from the working piston. From a certain relative displacement of the working piston and the annular piston, the originally relatively small effective area of the annular piston increases.
  • the ring piston can therefore be moved towards the stop (brake ring) with acceleration. Once at the stop, the piston is retrieved according to the principle described above. Since the diameter of the working piston is smaller than the inside diameter of the working cylinder, compressed air can enter the piston return chamber. The return of the ring piston also takes the working piston to the top dead center position as soon as the ring piston engages the working piston from below. The ring piston is therefore an aid to pneumatically return the working piston to the top dead center position from any position between the top and bottom dead center positions.
  • the piston return according to the invention therefore enables the design of a conventional pneumatic single-use driving device to be a multi-impact driving device, the number of strokes being determined by the actuation time of the trigger and the stroke frequency by the corresponding design of the control valve.
  • the working piston Since in the multi-impact driving tool according to the invention the working piston is moved back into the starting position before each driving impact, its kinetic driving energy increases to the extent that, with the further driven fastening means, the advance per stroke increases.
  • the effective driving energy of the ram therefore increases with increasing driving resistance of the fastening means.
  • the driving tool according to the invention has considerable advantages.
  • the operator actuates the driving tool until he feels or hears that the nail head rests on the workpiece. Based on experience, the operator can also adequately measure the driving process for each nail. It is therefore possible to drive in nails or other fasteners evenly.
  • the driving energy per shot can be chosen to be much smaller than in impact devices.
  • the driving tool according to the invention can therefore be significantly reduced in size and weight compared to known devices. It is therefore easier to handle and can also be used advantageously in tight spaces. Smaller driving tools naturally also require less material and manufacturing costs.
  • the driving energy per driving impact is much lower, so that there is also a lower security risk.
  • the fastener is less loaded when processing with the driving tool according to the invention than with impact driving tools. It eliminates the risk of cracking between the head and shaft of a nail.
  • the driving tool according to the invention is equally suitable for driving in magazine and individual fasteners.
  • the fasteners are usually lined up in strips so that they can be stored in a suitable manner. Staples are processed into staple rods, nails into nail strips, which are held together with the help of plastic bands or the like. In this context it is also known to provide a suitable feed device in order to advance the next one into the firing channel after driving in a fastening means. With U-shaped clamps, a spring-loaded feeder is often sufficient. A pneumatically operated feed device is often used for nails. In the driving tool according to the invention, the advance of a nail strip or a nail winding (nail coil) can be controlled so that a nail only enters the firing channel before the start of a multiple-stroke driving process.
  • an additional trigger can be provided on the driving tool to actuate the feed device.
  • an alternative possibility is to couple the actuation of the feed device with the release of the release lever. If the release lever is released after a driving-in process, the feed device is activated and pushes a new fastening means into the firing channel.
  • the fastening means are bound to one another, for example by gluing or by other connecting means, the connection is sheared off by the driving plunger.
  • the last fastening means for example a nail, is no longer held by the following one. Rather, there is a risk that it will slide out through the firing channel.
  • an embodiment of the invention provides that the shot channel in the area in which the head of the nail emerges from the magazine has at least one holding jaw, which is of at least At least one spring is biased radially inwards to hold the nail in the firing channel before driving.
  • the holding jaw can additionally or alternatively be magnetic in order to hold a nail in the firing channel.
  • the driving tool shown in Fig. 1 consists of a cylinder part 10, a muzzle tool 11 attached under the cylinder part 10, a handle part 12 which is attached to the cylinder part 10, and a magazine 13 which is arranged between the muzzle tool 11 and an extension of the handle part 12 is.
  • the cylinder part 10 has a cylindrical housing 14 which consists of two sleeves arranged one inside the other and is sealed off in the upper region by a cap 16.
  • a working cylinder 17 is arranged in the housing 14. It has an outer radial collar 18 which cooperates in a sealing manner with the inner wall of the housing 14. This forms an upper chamber 19 and a lower chamber 20.
  • the lower chamber 20 is connected to the interior of the cylinder via lower openings 21 and via upper openings 22.
  • a working piston 23 is arranged in the cylinder, the diameter of which is smaller than the inside diameter D2 of the working cylinder.
  • a cylindrical tappet 24 is connected to the working piston 23 and extends through an opening of a brake ring 25 at the lower end of the cylinder 17.
  • the working cylinder 23 is surrounded by a cup-shaped annular piston 26.
  • a relatively thin cylindrical section of the annular piston 26 interacts with a seal 27 of the piston.
  • a section of the annular piston 26 with a smaller inside diameter cooperates with the driving plunger 24 by means of a seal 29.
  • An annular seal 28 on the outside of the annular piston 26 interacts in a sealing manner with the cylinder wall.
  • the inner diameter of the active surface of the upper section of the annular piston 26 is denoted by D1, while the diameter of the tappet is D3.
  • the mass of piston 23 and tappet 24 on the one hand and of the annular piston 26 on the other hand and the diameter of the active surfaces of the two pistons is selected such that is.
  • A1 is the effective area of the working piston 23
  • A2 is the effective area of the upper section of the annular piston 26
  • m1 is the mass of the working piston 23 and plunger 24 and m2 is the mass of the annular piston 26.
  • a weft channel 30 is provided in the mouthpiece 11, each of which receives an annular shaft nail 31 of a nail strip 32, the individual nails 31 being held together by, for example, plastic strips 33. They are guided in magazine 13 in a known manner.
  • a feed device not shown, is used to feed the strip 32 in the direction of the firing channel 30.
  • a sensor 34 is also assigned to the muzzle tool 11, the function of which will be described later.
  • a reservoir 35 which is connected to a connection 36 for connection to a compressed air line in a manner known per se.
  • a release lever 37 is pivotally mounted on the underside of the handle part. It actuates a release valve 38, which in turn interacts with a repeating control valve 39.
  • the repeating valve 39 is connected to the annular space 19 via a bore 40.
  • the annular space 19 is connected via a plurality of bores 41 to a space 42 above the working piston 23 in its top dead center position or below the stopper 16.
  • the described driving-in device works as follows:
  • the preferably pneumatically operating feed device not shown, has advanced the strip 32 so far that an annular shaft nail 31 is located in the weft channel 30. This process takes place after an annular shaft nail 31 has been driven into the beam 45 via a hole 43 in a sheet metal 44 on a beam 45.
  • the control valve 39 ensures that the space 42 is connected to the compressed air reservoir 35.
  • the working piston 23 then starts to move in a known manner.
  • the ratio of the active areas and the masses already mentioned is such that the annular piston 26 is in no case accelerated more than the working piston 23.
  • the working piston 23 therefore always pushes the annular piston 26 a little in front of itself.
  • the driving energy is designed such that normally the nails 31 are not driven into the workpiece 45 in one stroke.
  • the nail 31 is driven in only by a certain amount, the driving plunger 24 and thus the piston 23 being decelerated relatively quickly and finally being stopped.
  • the kinetic energy inherent in the annular piston 26 causes the annular piston 26 to continue on its way.
  • the upper section of the ring piston comes with it the seal 19 of the piston 23 out of engagement, its effective area exposed to the driving pressure increases, as a result of which the annular piston 26 moves downward with greater acceleration.
  • the compressed air can enter the return chamber 20 via the openings 22 and pressurize the annular piston 26 from below via the bore 21.
  • the annular piston 26 is pneumatically retrieved (in the known manner in accordance with the pneumatic piston retrieval in known driving tools).
  • the annular piston 26 takes the working piston 23 with it and conveys it to the top dead center position.
  • the control valve 39 is a repeating valve, i.e. a relief or venting of the pressure chamber 42 is followed by a renewed pressurization.
  • the control valve 39 can therefore cause any number of pressure surges on the working piston 23, this number only depends on how long the trigger lever 37 is operated. If the working piston 23 has therefore reached its top dead center position, the control valve 39 effects a further driving stroke.
  • the driving tool shown is therefore a multi-impact device. The operator will therefore operate the release lever 37 until he sees or feels that the nail has been fully driven. It should be mentioned that the control valve is of a type known per se. Its function is therefore not discussed in detail here.
  • FIG. 4 shows a further customary embodiment of a repeating valve as a so-called head valve system 60. It can also serve for the pneumatic control of the compressed air supply to the piston arrangement 23, 26.
  • This repeating valve is also actuated indirectly by a trigger lever 61 via a known trigger valve 62. When the repeating valve is triggered, this, like in the valve arrangement already described, alternately pressurizes and depressurises the pressure space above the piston arrangement 23, 26.
  • the L-shaped sensor plate 34 is axially displaceably mounted on the outside of the mouthpiece 11, the limitation being carried out with the aid of a pin 50 which is seated in an elongated hole 51 in the plate 34.
  • the cross leg of the plate 34 cooperates with a spring 52 and an adjusting rod 53. It serves to act either mechanically directly on the actuating valve 38 or the control valve 39 or on the pneumatic feed (not shown) for the nail strip 32.
  • the control with the aid of the sensor 34 can be such that the feed device advances the nail strip 32 by a nail spacing width and conveys a new nail into the firing channel 30 when the sensor 34 is moved upward by placing it on a workpiece.
  • the feed device can also be controlled in a different manner, for example via the release lever 37.
  • the feed of a nail can take place, for example, at the moment in which the operator releases the trigger 37 after a multiple-stroke actuation.
  • the nail advanced into the firing channel 30 is held in position by the holding strip 33. It cannot slide out undesirably. This stop option does not exist for the last nail of a strip. From Fig. 3 it can be seen that in an axial region of the upper part of the firing channel 30, a plurality of jaws 55 limit the firing channel 30.
  • the jaws diverge upwards, so that in the event of an accidental triggering the plunger 24 does not strike the jaws 55 from above, if there is no nail in the firing channel 30 and the jaws 55 are at a minimum distance from one another in a relaxed position.
  • a nail 31 is advanced into the firing channel 30, its head is gripped by the jaws 55.
  • the driving plunger 24 hits the nail head and forces it out of the area of the jaws.
  • the narrowest cross section between the jaws 55 is preferably dimensioned so that the driving plunger 24 can pass freely.
  • the jaws 55 can also be magnetic to increase the holding effect of a nail 31.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Nozzles (AREA)

Claims (9)

1. Appareil d'enfoncement pour des moyens de fixation, actionné pneumatiquement et comprenant un cylindre de travail, dans lequel est disposé un piston de travail solidaire d'un poussoir d'enfoncement et dans lequel une butée limite la course de travail du piston de travail, et comprenant une vanne de manoeuvre pouvant être actionnée par un déclencheur, ladite vanne reliant pendant son actionnement alternativement à une source d'air comprimé ou à l'atmosphère une chambre de travail située au-dessus de sa position de point mort haut et une chambre de retour du piston, entourant le cylindre de travail, et reliée à ce dernier par une première ouverture voisine de la butée et par une deuxième ouverture qui en est éloignée, caractérisé en ce que le piston de travail (23) a un plus petit diamètre que celui du cylindre de travail (17), un piston annulaire (26) disposé avec étanchéité dans le cylindre de travail (17) pouvant coulisser de façon étanche sur le poussoir d'enfoncement (23) et coopérant de façon étanche, dans la position de point mort haut, avec le piston de travail (23), le rapport des surfaces d'action et des masses du piston de travail (23) et du poussoir d'enfoncement d'une part et du piston annulaire (26) d'autre part étant tel que le piston annulaire (26) n'est pas plus fortement accéléré, pendant la course de travail, que le piston de travail (23).
2. Appareil d'enfoncement selon la revendication 1, caractérisé en ce que le poussoir d'enfoncement (24) a une section transversale circulaire.
3. Appareil d'enfoncement selon la revendication 1 ou 2, caractérisé en ce que les surfaces actives supérieures des deux pistons (23, 26) se trouvent sensiblement à la même hauteur.
4. Appareil d'enfoncement selon l'une des revendications 1 à 3, dans lequel il est prévu un dispositif d'avance pour faire avancer une bande hors de moyens de fixation dans la direction du canal de chasse, caractérisé en ce qu'un moyen de fixation (31) est poussé en avant dans le canal de chasse (30) peu avant le déclenchement d'une course d'enfoncement.
5. Appareil d'enfoncement selon la revendication 4, caractérisé en ce que le dispositif d'avance est actionné par un déclencheur séparé.
6. Appareil d'enfoncement selon la revendication 4, caractérisé en ce que le dispositif d'avance est commandé par le déclencheur (37), de préférence de façon qu'un moyen de fixation (31) soit avancé dans le canal de chasse (30) lorsque le déclencheur (37) est à nouveau libéré après un actionnement.
7. Appareil d'enfoncement selon la revendication 4, dans lequel un capteur (34) est disposé à l'embouchure (11) du canal de chasse et est actionné lors de la pose de l'appareil d'enfoncement sur une pièce d'oeuvre (45), caractérisé en ce que le dispositif d'avance est commandé par le capteur (34).
8. Appareil d'enfoncement selon l'une des revendications 1 à 7, caractérisé en ce que le canal de chasse (30) présente, dans la région où entre le moyen de fixation (31) sortant du magasin (30), au moins une machoire de maintien (55), qui est précontrainte radialement vers l'intérieur par au moins un ressort (57), pour maintenir le moyen de fixation dans le canal de chasse (30) avant l'enfoncement.
9. Appareil d'enfoncement selon la revendication 8, caractérisé en ce que la machoire de maintien (55) est magnétique.
EP87109438A 1987-07-01 1987-07-01 Outil d'enfoncement pneumatique pour des moyens de fixation Expired - Lifetime EP0297156B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE8787109438T DE3762196D1 (de) 1987-07-01 1987-07-01 Pneumatisch betaetigtes eintreibgeraet fuer befestigungsmittel.
EP87109438A EP0297156B1 (fr) 1987-07-01 1987-07-01 Outil d'enfoncement pneumatique pour des moyens de fixation
AT87109438T ATE51790T1 (de) 1987-07-01 1987-07-01 Pneumatisch betaetigtes eintreibgeraet fuer befestigungsmittel.
US07/210,235 US4856696A (en) 1987-07-01 1988-06-23 Pneumatically operated driving tool for fasteners
JP63164835A JP2603109B2 (ja) 1987-07-01 1988-06-30 ファスナー自動打ち込み装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP87109438A EP0297156B1 (fr) 1987-07-01 1987-07-01 Outil d'enfoncement pneumatique pour des moyens de fixation

Publications (2)

Publication Number Publication Date
EP0297156A1 EP0297156A1 (fr) 1989-01-04
EP0297156B1 true EP0297156B1 (fr) 1990-04-11

Family

ID=8197099

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87109438A Expired - Lifetime EP0297156B1 (fr) 1987-07-01 1987-07-01 Outil d'enfoncement pneumatique pour des moyens de fixation

Country Status (5)

Country Link
US (1) US4856696A (fr)
EP (1) EP0297156B1 (fr)
JP (1) JP2603109B2 (fr)
AT (1) ATE51790T1 (fr)
DE (1) DE3762196D1 (fr)

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US5803338A (en) * 1996-11-26 1998-09-08 Senco Products, Inc. Fastener driving tool for locating a pre-existing hole in a first workpiece and driving a fastener therethrough into a second workpiece
US5931622A (en) * 1997-10-07 1999-08-03 Illinois Tool Works Inc. Fastener assembly with lateral end extension
US5836732A (en) * 1997-10-07 1998-11-17 Illinois Tool Works, Inc. Fastener assembly
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USD410182S (en) 1997-12-31 1999-05-25 Porter-Cable Corporation Internal combustion fastener driving tool
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US6041603A (en) * 1997-12-31 2000-03-28 Porter-Cable Corporation Internal combustion fastener driving tool accelerator plate
KR20030017281A (ko) * 2001-09-21 2003-03-03 신구성 자동 못박음 장치
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US6763990B2 (en) * 2002-07-30 2004-07-20 Yun-Chung Lee Rotary cover head of nail gun
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US7866521B2 (en) * 2004-12-03 2011-01-11 Black & Decker Inc. Magazine for wired-collated fasteners with automatic loading
US7137186B2 (en) * 2004-12-03 2006-11-21 Black & Decker Inc. Magazine for wired-collated fasteners with automatic loading
US7950556B2 (en) * 2005-03-16 2011-05-31 Black & Decker Inc. Coil nail spreader
US7537145B2 (en) 2007-02-01 2009-05-26 Black & Decker Inc. Multistage solenoid fastening device
CA2943806C (fr) 2014-03-27 2022-05-31 Techtronic Power Tools Technology Limited Dispositif d'entrainement d'attache motorise et son procede de fonctionnement
AU2016291235B2 (en) 2015-07-09 2021-09-16 Simpson Strong-Tie Company, Inc. Fastening and alignment member
US11110575B2 (en) 2019-01-31 2021-09-07 Gary Desch Combination nail dowel gun

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EP0205633B1 (fr) * 1985-06-21 1988-01-27 Joh. Friedrich Behrens AG Assemblage de soupape

Also Published As

Publication number Publication date
JP2603109B2 (ja) 1997-04-23
DE3762196D1 (de) 1990-05-17
ATE51790T1 (de) 1990-04-15
US4856696A (en) 1989-08-15
EP0297156A1 (fr) 1989-01-04
JPH0192075A (ja) 1989-04-11

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