DE1478936A1 - Valve device for a device operated by compressed air for driving in fasteners - Google Patents

Description

Re: B 456 / K. - Applicant: Dieter Haubold company

3OO5 rlemningen -lesenariold 1 Carl-Zeiss-Strasse 19

Valve device for a device operated by compressed air for driving in fasteners

The invention relates to a valve device for a device operated by compressed air for driving in defosting means, like U-shaped brackets, lu'geln and The like, in which a compressed air supply space permanently connected to the compressed air supply line o ^ en the upper one open end of the working cylinder by means of a pneumatic Control Icolbens aligned with the working piston is completed, which is combined with a vent valve for dsn working cylinder.

In one known from German patent specification 1,144,060 With this type of equipment, the control piston can be moved up and down in a control cylinder arranged above the working piston and ije ^ en these sealed. The vent valve is in housed and against a cylinder bore of the control piston provided coaxially to the working cylinder

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this also sealed so that the control piston valve unit formed and vent valve requires a precise fit and a series of sealing rings, which the production of the device is considerably more expensive. Since these devices are often mass-produced, it is desirable to choose the manufacturing tolerances as large as possible and with. get along with few sealing elements.

The movement of the control piston serving as the inlet valve for the working cylinder is operated by hand jjetätijungsventil causes that to initiate the working stroke of the ■ percussion piston is adjusted and through appropriate guidance the compressed air. Put your piston on the pneumatic bed the operational situation brings. So that the device has a high impact performance can develop, the percussion piston must immediately after moving the detection valve with full pressure the compressed air are applied. This assumes that the vent valve is closed before the control piston is opened Movement begins, because if the vent valve is not fully closed, some of the compressed air that is used in the. Opening movement of the control piston in the working cylinder flows into the open air and causes a pressure drop, which results in a corresponding reduction in the performance of the device

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The invention is based on the object, a device of the initially mentioned type in such a way that in addition to, a simple, a design which enables inexpensive manufacture, a high impact performance is achieved. According to the invention are the control piston and the vent valve associated with it borne by a membrane, which is in de; j ger litkörper clamped and designed so that the vent valve when in operating position. Control skids closed is. In this way it is ensured that the percussion piston immediately after from its rest position The control piston opens with the full pressure of the compressed air which cannot blow into the open air through the vent valve. This eliminates any loss of compressed air avoided, and the Gere.t develops a high impact power. The vent valve is only open during the return stroke of the percussion piston, so that it is displaced by it Air is discharged into the free and the movement of the percussion piston does not brake, but is closed after reaching its starting position. As a result, the Gerilt continues to work a distinctive two-stroke system.

It is advisable to design the membrane in such a way that it is under constant tension, which keeps the vent valve in its closed position. In this way the venting will ^:

Valve

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closed immediately after the pressure of the free air holding it in the open position ceases. ^u:. ■ - ■ · ■ - "- ■■■

According to a preferred feature of the invention, the effective t. The top of the diaphragm is larger than the area of the control piston and is either "with" the compressed air reservoir via the actuating valve or with the outside air in connection, the vent valve attached to the membrane with play is enclosed by the control piston · ~. '

It is known from US Pat. No. 3,106,136 to 'close off the upper open end of the working cylinder from a compressed air storage space that surrounds it and is permanently connected to the compressed air supply line by a membrane that interacts directly with the upper hand of the cylinder serving as a valve seat and is pressed onto the edge of the cylinder by a compression spring * The membrane serves here directly as an inlet valve for the working cylinder and is exposed to heavy wear due to its contact with the circular ring surface of the cylinder end.In the middle of the membrane clamped between the housing body and its cover, a vent valve is embedded , which is arranged on a special above the membrane and with -. control cylinder coaxial with the working piston up and down

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ί_ "is movable. The vent valve requires a precise _; holder as well as several sealing rings and cannot be closed with certainty in the output slag e deä 'impact piston

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In contrast, there is the closing element for the working cylinder in the device configured according to the invention from one Control piston, de ^ Preferably plate-shaped or bell-shaped is formed and with an elastic serving as a valve seat Sealing ring of a housing partition cooperates. It is advisable to use the upper end of the cylinder as the valve seat to use enclosing sealing surface, so that the hand of the cylinder does not come into contact with the control piston and this is largely protected from wear and tear · Since the vent valve is enclosed with play by the control piston and from the. Membrane is worn ", there is no need Having an exact fit is also not a special sealing element necessary between the vent valve and control piston, which is a allows much cheaper production.

The actuating valve is used to perform a working stroke manually operated, whereby the tree above the membrane comes into contact with the outside air, while on a lower one

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Hing face of the control piston of the pressure in the reservoir »breakfast room - ^ - T contained compressed air acts, which raises the spool with overall _r schlosseneni vent valve and thereby the air in the pantry opens the way into the power cylinder for pressurizing the working piston. Since the vent valve is closed before the start of the working stroke, the percussion piston is immediately subjected to the full pressure of the compressed air.

For more details and advantages of the. Invention should, based on two exemplary embodiments illustrated in the drawings are explained in more detail. Show it:

Fig. 1 shows the partial longitudinal section of an

form of management of the subject matter of the invention in the operating position,

Fig. 2 shows the same device in the rest position,

Fig. 3 shows the longitudinal section of another embodiment in the operating position and

4 shows the longitudinal section of this embodiment in the rest position.

In the embodiment according to dejvj? I £, uren 1 and 2, the. As portable hand tool trained drive core a device body 1, the z. B. from a light metal casting or

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Pressed piece: manufactured and ax a lateral handle, not shown, as well as a connecting piece for a compressed air supply line. In the device body there is a, ΡΓβ £ ΐμίtYorratsraua 2 housed, which is permanently open, Jerbjind ^ mg with -the compressed air supply line stands and is closed off by a partition 3 against which consists of a sleeve best ^ eadea ^^^^ i ^ i ^^ ti ^ er 4. The upper end of the partition 3 is provided with an annular extension ::,, dfr.jde The working cylinder 4 is tightly unisehlieBt and in which an eJLa.s $% S; Ghe gasket insert 6 is embedded. In the working cylinder 4 there is a percussion piston 7 { see FIG sealed by an elastic O-inlet 8 and on its "lower side a shoulder 9 is provided for receiving the fastening means 10, which drives the fastening means in the usual way. The partition 3 forms with the working cylinder 4 and d he door wall 11 of the device body 1 an air kasaner 12 for storing FreSlmft _t which in a known lieisö returns the piston 7 aa Bkide of his, workstation to the starting position shown in Figure .2.

Above the working cylinder and equiaxed with it is a Control piston 13 in a cylindrical bore 14 of the housing

body 1 can be moved up and down »The control piston

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serves as an inlet valve for the working cylinder 4 and closes it in the position shown in FIG. · Position against the '; Preßluffcvorratsraum 2, the control piston JL | , with its ·.-lower Ring surface 15 on the sealing ring 6 4 · * · upper Partition wall 5 rests. In the operational _ position, the control piston 13 is raised so that the compressed air reservoir 2 or one provided in the device body. Air duct 16 comes into open connection with working cylinder 4. - ...

The control piston 13 is sealed against the receiving, cylindrical bore 14 of the housing body 1 by a single elastic \ ^ ring 17 and has several axial channels 18, which are dominated by the valve disk 19 of a vent valve, the shaft 2O ₁ as from the drawing can be seen against the .aufnahmende him bore of the control piston 13 has a larger game. The channels 18 are closed when the vent valve 19, 20 is in the raised operating position shown in FIG. 1, in which the valve disk 19 rests against an elastic sealing insert 21 of the control piston 13.

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The channels 18 mUnplen in a chamber 22, the top by a elastic memorandum 23 is completed and about radial Channels 24 with an annular space 25 is in communication. This stands over a radial one mounted in the housing body 1 Passage 26 in "open communication with the outside air" and has a larger diameter than the cylindrical bore 14 of the device body 1 that receives the control piston 13.

The membrane 23 has a curved shape and is on its outer edge between the device body 1 and a cover plate 27 and in their cement between the stem 20 of the vent valve and a disk 28 clamped. This is connected to the valve

■ through a.

Shank 20 /. screw bolts 29 arranged in the central axis of the working cylinder 4 and presses the membrane 23 against the surface of a valve stem 20 surrounding Support ring 28a. Under the screw bolt 29 is located a permanent magnet 30 embedded in the valve stem 20 which, in a known manner, forms the “percussion piston 7 in the one shown in FIG Starting position holds.

The membrane 23 encloses a chamber 31 between itself and the inner wall of the cover plate 27, which is the upper continuation the Ringkainmer '25 forms and the same inner diameter as

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this has. The chamber 31 is via a channel -32, one in j "of the membrane 23 in the vicinity of its edge passage ■ 33 and a channel 34 with the valve chamber 35 of an actuating valve 36 in connection, the plunger 37 of which the compressed air supply Sraum 2 penetrated and to control the valve 36 by a finger lever, not shown. and moved Vierden can.

The valve chamber 35 is in communication with the compressed air reservoir 2 via a passage 38 and via a passage 39 in Connection with the outside air,

In the rest position, the individual parts are in the position shown in FIG. 2, in which the chamber 31 is above the membrane 23 via channel 32, passage 33, channel 34, valve chamber 35 and passage 38 is in connection with the compressed air reservoir 2. Since the upper side of the membrane 23 has a larger area than that which is also under the pressure of the air in the storage space 2

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on the outside over the deft ring shoulder 15 of the control piston 13 ra- ' lower ring shoulder 4Ö, this is pressed down so that its ring attachment 15 rests on the sealing ring 6 and closes the working cylinder 4 against the compressed air reservoir 2 * The membrane 23 is due to the pressure of the load on it

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Compressed air is bent downwards against the pre-tension existing as a result of its curved shape, and the valve plate 19 of the vent valve 19 »20 is also pressed downwards, so that the space above the percussion piston 7 passes over; The opened, secondary ventilation ducts 18, the valve chamber 22, the radial ventilation ducts 24, the annular chamber 25 and the thermoset 26 are vented to the outside. The downward movement of the percussion piston 7 caused by the air from the "storage space 12" is therefore not slowed down by the air above it »

As soon as the percussion piston 7 has reached its upper end position, it is held here by the magnet 30.

When a fastening device or other fastening device, which is assembled in the usual way into a strip and located in the feed magazine (not shown), is to be driven into a workpiece or the like, the finger lever of the actuating valve 36 is pivoted, causing the valve tappet 37 to move into the position shown in FIG 1 position drawn is moved upwards. In this position, the diaphragm chamber 31 is connected to the external air via channel 32, passage 33, valve chamber 35, passage 3h and passage 39, and is therefore pressureless, while the pressure of the

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Air in the storage space 2 acts »As a result, move the control piston 13 and at the same time the valve disk 19 of the vent valve upwards, with the latter to rest on the sealing ring 21 reaches »The air from the storage space 2 can now unhindered and unthrottled over the partition 5 in reach the working cylinder 4 and apply full pressure to the percussion piston 7, which is now its working stroke executes at great speed *

The actuating valve 36 remains in its in for a short time Figure 1 position as long as his finger lever is pressed will. As soon as the finger lever is released, the valve tappet 37 moves downwards into the position shown in FIG Position in which the membrane chamber 31 is in the described “Teise via the valve chamber 35 and the cylinder space above the percussion piston 7 via the open vent valve 19, channels 18, 24 and 25 as well as the passage 26 are vented stored air returned to its original position.

The membrane 23 is given by its, which can be seen from FIG curved shape such a bias that the vent valve 15, 20 attached to it in its closed position is held, which is responsible for the generation of a high

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.stung is important; because the entire after lifting the control piston 13, iurqlen working cylinder 4 flowing air for acceleration of the percussion piston 7 is utilized without any part of the air when the vent valve is not yet fully closed can be blown off into the open, as is often the case with known types of such devices.

the drawing shows that the shaft 20 of the vent valve has in the receiving bore of the control piston 13 a relatively large game, which is due to the Function of the valve device is without influence, which also only has a single O-ring for sealing the control piston 13 required against the wall of the cylinder bore 14, whereby the production is significantly cheaper.

The embodiment according to FIGS. 3 and 4 differs differs from the first embodiment essentially in that that the membrane carrying the vent valve is not in a fixed housing part on its outer edge, but in one Auxiliary piston is clamped, which is arranged above the membrane and serves to actuate the vent valve.

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The shaft 20 of the vent valve 19 is in turn with; Play guided in an axial bore of the control piston 13 and connected via the screw bolt 29 and the thrust washer 28 and the support ring 28a to a membrane 43, the outer edge of which is clamped between a ring 45 and a bell-shaped auxiliary piston 46 by means of several screw bolts 44. This has a central bore 47 and is guided up and down in a cylinder bore 48 of the device body 1, against which it is sealed by an O-ring 49. An elastic washer 50 is attached to the heads of the screw bolts ^C 44 and is fastened to the top of the auxiliary piston 46. The cylinder bore 48 is tightly closed by a cover plate 51 which, with the upper end face of the auxiliary piston 46, encloses a space 52 which, via a channel 53, is in communication with the chamber of an actuation "valve 54 which, depending on the position of its plunger 55 the channel 53 connects with the compressed air reservoir 2 or with the outside air.

At the upper end of the working cylinder 4 are several entry slots 56 is provided, over which the lower end of the control piston 13, designed as a sleeve 57, passes.

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"The bell-shaped auxiliary piston 46 encloses one above the Diaphragm 43 lying chamber 58, which over the central bore 47 with the cylinder space 52 is connected to the heads the screw bolt 44 covering washer 50 leaves in the operating position shown in Figure 3 between the upper End face of the auxiliary piston 46 and the underside of the Cover plate 51 clears a narrow gap which, at the beginning of the working stroke, prevents the compressed air from entering from the compressed air reservoir 2 via actuating valve 54 and channel 53 to Top of the auxiliary piston 46 allows.

The auxiliary piston 46 has a larger top side than the control piston 13 and is consequently driven by the force acting on it Compressed air moves downwards, lifting the vent valve from the control piston 13, especially since the air above the centric fv Bore 47 and the piston chamber 58 directly the Membrane * 43 pressurized and an additional, downward " directed pressure on the vent valve 19, 20 *

In the Euhelage shown in Figure 4, the sleeve 57 rests on lower bands of the control piston 13 on the sealing insert of the partition 5 and closes the working cylinder 4 against the Compressed air reservoir 2 from «The space 52 above the auxiliary piston is connected to via channel 53 and actuating valve 54

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the Preßluftvorratsraum 2 »The air pressure acts through the cen- \ tric hole 47 of the auxiliary piston 46 to the membrane 43 and moves the vent valve 19, 20 down, so that the space above the percussion piston 7 in the same manner as in the first embodiment via the channels 18 and 24 as well as the '· passage 26 is vented "

If a fastening means is to be driven in, the plunger 55 of the actuating valve 54 is moved upwards, whereby the space 52 above the auxiliary piston 46 is vented. Since the control piston 13 has a shoulder at its lower end 57, the pressure of the compressed air in the gate space 2 causes the control piston 13 and thus also the auxiliary piston 46 to move upwards

is moved, whereby the vent valve 19 is closed / and the lower end 57 of the control piston 13 exposes the inlet slots 56 of the working cylinder 4. The compressed air from the Storage space 2 can now flow unhindered and unthrottled into the working cylinder 7 and accelerate the percussion piston in the working direction.

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Claims (1)

U7893.8 ! 1.) Valve device for a device operated by compressed air '*., for driving in fasteners with a permanent ι ■. . ■■ · '. . ■ ■. ■■■ '■■' Compressed air storage space connected to the compressed air supply line, against which the upper, open end of the working cylindera by means of a pneumatically operated, with the Working piston coaxial control piston is completed, which unites with the vent valve for the working cylinder is, characterized in that the control piston (13) and the vent valve (19) "from one in the housing body (1) clamped membrane (23, 43) are supported, the brings the vent valve (19) into its closed position, before the control piston (13) is lifted from its seat. and the working cylinder (/ »). with the compressed air storage room (2) connects. .2, valve device according to claim 1, characterized in that that the diaphragm (23 * 43) has a bias due to its curved shape, which the vent valve (19) of the control piston (13) holds in its equi-pouring position. - 18 - 909817/0355 «'T-t BAD ORiGiNAU -αβ - '1478938 3. Valve device according to claim 1, characterized in that that the top (31, 52) of the membrane (23, 43) has a large re has effective area than the control piston (32) and over the actuating valve (36, 54) is connected to the compressed air storage space (2) or the outside air, 4. Valve device according to claims 1 and 3, characterized in that that the stem (20) of the vent valve (19) with play in an axial bore of the control piston (13) is performed. ■: 5. Valve device according to claim 1, characterized in that the membrane (23) at its outer edge between the device body (1) and whose cover plate (27) is clamped and covers an annular space (25) which has a fine larger diameter than the cylinder bore that receives the control piston (13) (14) of the device body (1) ' \ 6 «Valve device according to claim 1, characterized in that that in the vent valve (19) a known ^, the percussion piston (7) holding the magnet in its initial position (30) is embedded. . ν - 19 - / ■ - ■ 909817/031 $ BAD ORiGlNAU ■ 7 valve device according to claim X, characterized in that that the control piston (13) has a shoulder (40) provided with a ring-shaped find (15) with »a sealing insert (6) an intermediate wall enclosing the working cylinder (4) and separating it from the compressed air reservoir (3 # 5) Busamnia works. 8. Ventileinriqhtung according to claim 1, characterized in that the membrane (43) is clamped in an auxiliary piston (46) which can be moved up and down in a cylinder chamber (52) mounted in the device body above the working cylinder (4) whose diameter is greater than the diameter of the cylinder bore (48) of the device body (1) which accommodates the control piston (46) » 9. Ventileinrlohtung according to claim 8, characterized in that the control piston (46) is bell-shaped and Lightning bolts (56) at the upper end of the working cylinder (4) takes effect » 10. Ventilelnrichtun ^ according to claim 8, characterized in that that the auxiliary piston (46) has a chamber (58) which is closed at the bottom by the membrane (43) and which has a passage (47) the piston front wall in connection with that of one Cover (51) closed cylinder space (52), which in turn via a channel (53) with the actuating valve (54) is connected. 909817/0355