DE1908085A1 - Impact device operated with compressed air, especially for driving in fasteners - Google Patents

Description

PATK N ΓΛΝ \ νΑΙ / Γ13 | ϋ U Ö U Q ί)

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;. ιιλλxoYKit Hanover, February 17th, 1969

THEATKItHTJt. B • V ₁ -HClONE 2 49 11

Re: 3 5o2 / Bg - Applicant: Dieter Haubold

Industrial nailers 3005 Hemmingen-Westerfeld Carl-Zeiß-Straße 19

kit Compressed air operated impact device, especially for driving Fastening means

The invention relates to an impact device operated with compressed air, in particular for driving in fastening means, for riveting or similar work, which is provided with a compressed air reservoir and in which the working piston is returned to the starting position by means of compressed air after each working stroke will.

In the case of impact devices of the type mentioned at the outset, it is known that the one required to return the working piston To store compressed air in an adjoining room of the working cylinder. As soon as the working piston does its work shub has ended, the compressed air stored in the adjoining space flows under the working piston and presses return it to its original position.

0098A5 / OS56

1908Ü85

It is also known to return the working piston Use compressed air from the compressed air supply or directly from a compressed air supply line is removed. The working cylinder is required here be vented after resetting the working piston, so that the Koloen on the working stroke is not slowed down by the air it displaces and compresses. The venting of the working cylinder means a great loss of compressed air. Gert ce rnic Adjoining rooms are also quite large and unwieldy, because the NeV, which stores the air for the piston return stroke takes up a lot of space and a compact and complex one between the working cylinder and the compressed air reservoir Druckluiteinlaßventil is required.

The object of the invention is, in one with compressed air operated impact device to save the previously usual compressed air inlet valve and the compressed air requirement compared to reduce the previously known devices. In addition, the dimensions of the device should be kept smaller than before will.

The invention consists in that in an impact device the aforementioned type of working cylinder at its upper end directly without the interposition of a

009845/0656

- §AD ORIGINAL

Drw j ^ iuftüirJ.a / .ventiis: .n open connection with the Jru.; AiU: 'tvcrratsr-u ... is un.i llittel for the supply -.v. · :. Compressed air from a compressed air supply line in -.-.:. Compressed air supply sr να:;, has.

Vo.'t-eilhsLit the working piston is designed as a downward Li'.'eaer cylinder, the jacket of which is turned into an .i ~ r. . "; aTrer of ArbeitszylinJers engages, wherein the compressed air before rat sr au ::: on the Eingicarnner n.it a ::: Dru2kluft- -uführun ^ skanal and a vent valve jes Hr-L eil 3.vol: ens;. .with the outside air in Yerbindun ^: ste .-: t.

1 :: "Another embodiment of the invention is the 3rd in _: -: vi:. :: .- 3r U-er a stepped piston carrying a bore, a release valve and a safety valve connected to the compressed air supply duct. The Veroindunj ies Druckiuftvorx 'ctsrauaes r.:it de; n annulus is advantageously created by an a:.; working cylinder attached shut-off valve.

In its starting position, the end face of the working pin can engage in a recess in the housing of the impact device and be protected by seals against the ingress of the compressed air located in the compressed air storage space. To initiate a work

009845/065 6

■ '.T9Ö.8.Q8S

It is advantageous to use the working piston with a To provide ring shoulder. So that the working piston is brought into its starting position without a large pressure surface it is advisable to attach the vent valve to the front of the working piston, which ventilates the compressed air storage space at the end of the working stroke. Furthermore, the face can -.

of the working piston is provided with a through-hole

so that / when the lifting stroke has ended in a recess of the Can intervene in the device housing. This becomes a that Housing penetrating bore saved together with a complex control valve device. It is useful the working piston at its upper end with a running piston To provide a sealing ring that allows the compressed air in the storage room to access the top of the KoToen denied. _;

■ «·. - - ■ '■ - ■ "■■ .- ■'

An am ■ Non-return valve attached to the working cylinder * · be seen, which consists of an elastic sealing ring, which is inserted in a perimeter shut, in "which Qüer'-bores open out of the annular chamber of the working cylinder. When the release lever of the actuating valve is relieved the working piston. in its starting position * In the event of a sudden drop in pressure in the pressurized air supply

0096A5 / 0856 _:

1308085

channel, the working piston is pressed down by the compressed air stored in the storage space. This process would not only be initiated by pulling the release lever, but even if the load is suddenly relieved by pulling it off of the compressed air supply hose. However, uncontrolled hitting of the working piston can lead to accidents at work, so it is particularly advantageous to use the compressed air supply duct of the impact device Provide safety valves in the form of spring-loaded ball check valves. .

Further details of the subject matter of the invention can be found in the subclaims.

In the drawing, an embodiment according to the invention is shown and explained in more detail. Show here:

Fig. 1 the impact device with the working piston in its starting position -% and

2 shows the working piston after the working stroke has ended.

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190808b

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In the housing 1 of an impact device, a working piston 2, an annular chamber 3 located within a working cylinder 5, a compressed air supply space X, a stepped piston 6, a release valve 7 and safety valves B and 9 are arranged. The compressed air supply duct is denoted by 10, and the annular space 3 can be vented via a vent duct 11. On the outside of the working cylinder 5, a check valve 12 for the supply of compressed air to the reservoir sr-aüm 4- is arranged within a circumferential groove 19 in which the yuerbores IS open. An annular shoulder 13 of the working piston 2 is used to initiate a working stroke. The working piston also carries a vent valve 14,. Which is provided with a valve stem 14a, the length of which is greater than the. 2. An annular groove with an inserted seal 17 is provided on the head of the working piston, which prevents the compressed air located in the Yorratsram V from reaching the top of the piston before the start of each working stroke. In its starting position, the working piston 2 engages with its end face in a recess 16 in the housing 1. In order to allow the air contained therein to escape when the working piston enters the recess, its end face has a through-hole 15. For venting the working

00 9845/0 656

b serve during a working stroke large 23 on üyllniexboäen oei'indliche vents A λ 2 ... Arbeitokolben mounted plunger 2a serves wherein ev ^ ^-: .Ü.l "cen" embodiment zua driving Be-I ¹ ^ o. L-un _c : s3: itceln. The trigger valve 7 is, together with a; ii bleed valve 20 on a valve stem 22 _L e: IGT r.ea.nsam to ^ eoranev, via a release lever 21, "et-Li".

The side of the stepped piston facing the working cylinder 5 ο has a smaller area 2- <to which compressed air is applied than the opposite side 25. The stepped piston ο is therefore when compressed air

pushed forward and blocks the ventilation duct 11 away. The working piston 2 is then relieved at ^ th,: - Auslosehebel 21 in its starting position after o: -. en ^

pushed over the check valve ·, 12 the Storage room. ^ '.sit compressed air. The one in the housing recess Io located air can through the hole 15 of the KoI: .ens 2 escape. As soon as the "release lever 21 after is sucked up (Fig. 2), the release valve 7 blocks aie. further supply of the compressed air, while the Ven-; til 20 establishes a connection to the outside air, so that the back 25 of the Stufenkolöens 6 is relieved and

00984S / 06S6

- &: - ■ _ ■ '■ - -

the stepped piston releases the ventilation channel 11; the Compressed air located in the annular channel 3 can then escape. The ring shoulder 13 offers an attack surface, for the compressed air, so that the driving piston 2 from the Recess 16 located in the housing 1 can be drawn can. Then the one in your inventory at 4 can be used Compressed air fully on the surface of the working piston. .work and hit it down. Shortly before reaching the lower end position of the working piston opens the vent valve 14 of the working piston and the in The compressed air located in the storage space 4 can escape into the surrounding atmosphere via the openings 23. If the release lever 21 is pulled, the repeats itself whole process, the compressed air has access to the again. Stepped piston 6, which is used in its front position and the ventilation duct 11 closes. Through this, that only ambient pressure in the compressed air reservoir 4 prevails, the working piston 2 can move upwards again. be pushed and compressed in the process ζ. T. the one located in it Air, so that after the end of the return stroke only the remaining amount of compressed air that is still missing via the Check valve 12 'is to be filled.

β '** - 4 mm

009845/0656

-; - 190808b

It is therefore to be emphasized as a particular advantage that an impact device produced according to the invention due to the lack of a complex compressed air inlet valve is very simple and has a low compressed air consumption. Due to the lack of a lifting surface In addition, -the subject of the invention compared to other devices smaller and thus for the respective operator is very handy.

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Claims (1)

, T908ü8b Claims Impact device operated with compressed air, especially sono.ere for driving in fasteners, with one: compressed air storage space and pneumatic return ... of the working piston into its starting position, then turn characterized in that the working cylinder (5) at seinec upper end immediately without the interposition of a Compressed air inlet valve with the compressed air reservoir (4) is in open connection and I-I means for supply, tion of compressed air from a compressed air supply line (10) in the compressed air reservoir. 2. Apparatus according to claim 1, characterized in that the Working piston (2) as a cylinder that is open at the bottom with one in an annular chamber (3) of the working cylinder 3 (5) engaging dumbbell is formed, the Compressed air storage space (4) via the annular chamber (3,) with the compressed air supply channel (10) and via a vent valve (14) of the working piston (2) is in communication with the outside air. 3. Device according to claims 1 and 2, characterized in that that the annular chamber (3) has a stepped piston (6) carrying a bore (6aJ) with a ventilation channel (11) 1308Ü8S - ii - and Uler a release valve (?) and a safety valve ( ■) TiLt, to which the compressed air supply channel (1O) is connected. . Ger "according to claims 1 to 3 $ characterized as:" is: · Compressed air reservoir [L) by ai :. working cylinder (5) a.irebrachte, \ n iz a non-return valve (12) equipped bores (18) with the annulus (3) is connected. ™ . Device according to claims 1 to 4, characterized in that: the working piston (2) with an annular shoulder (13) for Initiation of the working stroke is provided. . Gerlu according to Claims 1 to 5, characterized in that ..: the vent valve (14) is arranged in the end face of the Ar-Icens (2.). 7. Gera «, according to claims 1 to o, characterized in that da .: the working piston (2) one penetrating its end face Has bore (15). S. device "according to claims 1 to 7> characterized in that; the working piston (2) in its starting position engages with its front side in a recess (.16) · of the housing (1) ^ - of the impact device and through a seal (I?) is protected from the entry of the compressed air in the compressed air storage space (4).
0Ö9845 / 065.6. fiADOIWQiNAL _ 12 - 19Q8Ü8Ö 9 · Device according to claims 1 to 8, "characterized in that that the check valve (12} of the working cylinder off consists of an elastic sealing ring which is inserted into an annular groove (19) is inserted. 10. Apparatus according to claims 1 to 3, characterized in that the compressed air supply room [I ₊ ) is connected directly to the compressed air supply channel (10) via a safety valve (9). '''' ■ '■ 11. Device according to claims 1 to 10, characterized in that that the safety valves (Ö, 9) as spring-loaded ball check valves are trained. 12. Device according to claims 1 to 11, characterized in that • da £ - the release valve (7) together with a vent valve (20) is arranged on a common shaft (22) operated via a release lever (2L). 13. Device according to claims 1 to 12, characterized in that that the vent valve (I4) has a plunger (14a), the length of which is greater than the jacket length of the working piston (2). .. '.' .: 00 9845/06 56 ^ _ommh L Blank page