DE268156C

DE268156C -

Info

Publication number: DE268156C
Application number: DENDAT268156D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

PATENTSCHRIFTPATENT LETTERING

KLASSE 87b. GRUPPECLASS 87b. GROUP

Steuerung mit Stufenventil für Druckluftwerkzeuge. Patentiert im Deutschen Reiche vom 19. November 1911 ab. Control with step valve for compressed air tools. Patented in the German Empire on November 19, 1911.

Den Gegenstand der vorliegenden Erfindung bildet ein Druckluftwerkzeug, bei dem zum Umsteuern in der einen Richtung eine kleinere Fläche des als Stufenkolben ausgebildeten Steuerventiles zeitweise durch vom Schlagkolben zusammengepreßte Luft unter Druck gesetzt wird, und bei dem zum Umsteuern in der anderen Richtung eine größere Fläche des Steuerkolbens zeitweise durch Arbeitsluft ausThe subject of the present invention forms a pneumatic tool in which to Reversing a smaller area of the stepped piston in one direction Control valve temporarily by compressed air under pressure by the percussion piston is set, and for reversing in the other direction a larger area of the The control piston is temporarily switched off by working air

ίο dem Zylinder belastet wird. Durch diese Belastung der größeren Ventilfläche wird die Umsteuerbewegung des Steuerventiles aber nur eingeleitet, während ihfe Vollendung und das Festhalten des Ventiles auf seinem Sitz durch Frischluft erfolgt. Das Neue soll in der besonderen Art erblickt werden, wie hier die größere Fläche des Stufenkolbens nacheinander belastet wird. Durch diese neue Belastungsweise wird der Vorteil erreicht, daß das Ventil schnell umgesteuert und durchaus sicher in seiner Endstellung gehalten wird, ohne daß es nötig ist, am Steuerventil eine besondere, ständig durch Druckluft belastete Steuerfläche vorzusehen.ίο the cylinder is loaded. Because of this burden However, the reversing movement of the control valve is only due to the larger valve area initiated while completing and holding the valve on its seat Fresh air takes place. The new should be seen in a special way, like here the larger area of the stepped piston is loaded one after the other. With this new way of loading the advantage is achieved that the valve is quickly reversed and held safely in its end position, it is not necessary to have a special one constantly loaded with compressed air on the control valve Provide control surface.

Auf der Zeichnung ist ein derart ausgebildetes Druckluftwerkzeug in zwei Ausführungsformen beispielsweise dargestellt, und zwar zeigt dieIn the drawing, a compressed air tool designed in this way is shown in two embodiments, for example show the

Fig. ι ein Druckluftwerkzeug im Schnitt mit zurückgeschobenem Ventil undFig. Ι a compressed air tool in section with the valve pushed back and

Fig. 2 dasselbe Druckluftwerkzeug mit einer dem Rückwärtsgang des Schlagkolbens entsprechenden Ventilstellung.2 shows the same compressed air tool with one corresponding to the reverse gear of the percussion piston Valve position.

Fig. 3 und 4 zeigen eine weitere Ausführungsmöglichkeit des Druckluftwerkzeuges.3 and 4 show a further possible embodiment of the compressed air tool.

Das Druckluftwerkzeug besteht in an sich bekannter Weise aus dem Gehäuse «,· in dessen zylindrischem Innenraum sich der Arbeitsoder Schlagkolben b führt, c ist das an dem einen Ende des Zylinders α angeordnete Ventilgehäuse und d das Umsteuerungsventil.The compressed air tool consists in a manner known per se of the housing «, in the cylindrical interior of which the working or percussion piston b is guided, c is the valve housing arranged at one end of the cylinder α and d is the reversing valve.

Das Ventil ist in an sich bekannter Weise als Hohlventil und stufenförmig ausgebildet. Die kleinere Fläche des Ventiles ist hierbei dem Zylinderinner η des Werkzeuges zugekehrt, so daß sie beim Rückhub durch vom Schlagkolben zusammengepreßte Luft belastet werden kann. Die Lage des Bodens des Ventilen ist hierbei gleichgültig, so daß diese Bodenfläche des Ventiles nach Belieben am unteren Ende oder auch in der Mitte des Ventiles angebracht werden kann.The valve is designed in a manner known per se as a hollow valve and step-shaped. The smaller area of the valve faces the inside of the cylinder η of the tool, so that on the return stroke they are loaded by air compressed by the percussion piston can. The position of the bottom of the valve is immaterial here, so that this bottom surface of the valve attached to the lower end or in the middle of the valve as desired can be.

Am hinteren Teil des Ventiles sind in den Seitenwandungen des Ventiles ein oder mehrere Bohrungen e angeordnet. Durch diese Bohrungen kann zeitweise der Ventilraum χ des Ventiles mit einer im Ventilgehäuse angeordneten Ringnut f in Verbindung treten. Diese Ringnut f steht durch einen Kanal g und die Bohrung h mit dem Zylinderinnern des Werkzeuges in Verbindung. Die Bohrung h des Kanals g ist derart angeordnet, daß sie beim Vorwärtsgang des Schlagkolbens b "von diesem letzteren früher freigelegt wird als eine ebenfalls nach dem Zylinderinnern mündende Bohrung d"es Auspuffkanals i. At the rear of the valve, one or more bores e are arranged in the side walls of the valve. Through these bores, the valve chamber χ of the valve can intermittently come into contact with an annular groove f arranged in the valve housing. This annular groove f is connected to the inside of the cylinder of the tool through a channel g and the bore h. The bore h of the channel g is arranged in such a way that, when the percussion piston b ″ moves forward, it is exposed earlier by the latter than a bore d ″ in the exhaust conduit i which also opens towards the inside of the cylinder.

Claims

The compressed air is supplied to the hammer from space k through the bore I and the annular groove m in the valve housing c. When the percussion piston moves forward, the compressed air passes directly from the annular groove m into the interior of the cylinder; when the percussion piston moves backward, it moves from the annular groove m through another annular groove η in the valve d into the channel ο and through it

ίο passed in front of the piston. Channel ο is equipped with an extension p on the valve housing, which can come into contact with the larger area of valve d through a small hole s.

The compressed air tool works as follows:

If the valve is in the position as shown in Fig. Ι, compressed air will pass from the space k through the bore Z and annular groove m into the cylinder space behind the piston and move the percussion piston forward. The compression occurring in front of the piston is passed through channel 0 and the annular groove η in the valve to the outside.

As soon as the percussion piston has exposed the bore h during its forward movement, working air is released from the inside of the cylinder through the bore h into the channel g and through this into the annular groove f of the valve housing and through the bores e in the valve to the space χ of the larger valve surface of the valve (Tgelangen. This compressed air now acting on the larger area of the valve initiates the reversing movement of the valve before the exhaust is opened. On the one hand, however, the forward movement of the valve grinds the annular groove m and thus the further influx of compressed air to the inside of the cylinder on the other hand, the channels e in the valve body have also passed over the annular groove f , so that the compressed air in the valve chamber χ is trapped Compressed air located inside the cylinder or something already in front rher fresh air from the bore m through the annular groove η in the valve to channel 0 and through this on the one hand in front of the piston b and on the other hand via p, s to the valve chamber χ . The fresh air entering the valve chamber χ will stop the reversing movement of the valve and then hold the valve on its seat, while the compressed air coming through channel 0 in front of the piston will move the piston back.

The return movement of the valve to the starting position is caused by the impact piston Generated compression causes that occurs as soon as the piston is in its reverse gear has ground the exhaust holes.

The invention is of course in no way limited to the embodiment of the valve and the airways shown. So you could z. B. after the start of the movement of the valve by the working air from the cylinder, the fresh air, instead of feeding it through the channels 0, p, s to the valve chamber χ , first pass it into the valve chamber and only then into channel 0 . 3 and 4 show a compressed air tool designed in this way. In this embodiment, the bottom of the hollow valve facing the inside of the cylinder is equipped with further bores s in addition to the bores e. Both bores are arranged in such a way that, in the position of the valve for the reverse gear of the percussion piston, the compressed air from the channel m through the bore s first reaches the valve chamber χ and only then passes from the valve chamber through the bore e into the channel 0 to be able to return the piston. Otherwise, however, the operation of this valve is the same as the * in the embodiment described above and shown in Fig. 1 and 2, because in the second embodiment, the 'movement of the valve is initiated by the air flowing from the channel g , while the Completion of the reversing movement and the holding of the valve in its lower position is effected by fresh air. A special pressure surface, which is constantly under the pressure of the fresh air, is therefore not necessary. The embodiment shown in FIGS. 3 and 4 has the advantage over the embodiment shown in FIGS. 1 and 2 that during the forward movement of the percussion piston, the space in front of the piston with channel 0 remains in connection with the exhaust for so long until the valve is completely reversed. A compression in front of the piston and thus a weakening of the stroke of the piston cannot occur.

The same advantage can also be achieved with the embodiment shown in FIGS. 1 and 2 if the channels are arranged in such a way that after the valve movement has been initiated by the air from the cylinder, fresh air first comes behind the valve into the valve chamber χ and only after then comes before the piston when the valve completes its movement.

Ρλ τ ε ν τ - A ν s ρ r υ c η:

Control with step valve for compressed air tools, in which the reversing movement of the valve in one of the

This is caused by working air, in the other direction by compression, characterized by an air path (s) controlled by the valve, by means of which the area (d) loaded with working air during the reversal of the valve is loaded with fresh air shortly before the end of the reversing movement and during the Upward movement of the piston in the loaded state is obtained for the purpose of holding the valve in its reversed position and thus avoiding a special, constantly loaded area for this retention.

For this purpose ι sheet of drawings.