SE455582B

SE455582B - PRESSURE SCREW DRIVER WITH A DEVICE FOR SUPPLYING AND HOLDING THE SCREW USING PRESSURE AIR

Info

Publication number: SE455582B
Application number: SE8100427A
Authority: SE
Inventors: D Gotsch; M Karpf; H Weidner
Original assignee: Bosch Gmbh Robert
Priority date: 1980-01-31
Filing date: 1981-01-26
Publication date: 1988-07-25
Also published as: JPS56119380A; SE8100427L; DE3003390C2; GB2068284A; JPH0244672B2; DE3003390A1; GB2068284B

Description

455 582 2 strax intill belägna ejektorn S, som i sin tur mynnar i en munstycksöppning 26. 455 582 2 next to the ejector S, which in turn opens into a nozzle opening 26.

Munstycksöppningen 26 mynnar i en munstyckskanal 27, med vilken även en mun- styckskanal 28 är förbunden. Munstyckskanalen 28 leder till undertryckskanalen 16 via backventilens 6 inre utrymme, som innehåller en kula 29. Ett stift 30, som styrs i ett hål 31 i huset 1, skjuter in i ventilens 4 munstycksöppning 20.The nozzle opening 26 opens into a nozzle channel 27, with which also a nozzle piece channel 28 is connected. The nozzle channel 28 leads to the negative pressure channel 16 via the inner space of the non-return valve 6, which contains a ball 29. A pin 30, which is guided in a hole 31 in the housing 1, projects into the nozzle opening 20 of the valve 4.

Stiftets 3D ena ände ligger i kontakt med kulan 23. Stiftets uppgift är att avkänna en längsrörelse hos skruvbladet 19 när skruven förs in i sitt tillhörande hål, så att kulan 23 lyfts från sitt koniska säte och öppnar luftinloppsöppningen till motorn 2. Avstängningsventilen 7 bildas av en skruv 32 med en tätningsskiva, som kan sluta till munstyckskanalen 27.One end of the pin's 3D is in contact with the ball 23. The pin's task is to detect a longitudinal movement of the screw blade 19 when the screw is inserted into its associated hole, so that the ball 23 is lifted from its conical seat and opens the air inlet opening to the engine 2. The shut-off valve 7 is formed by a screw 32 with a sealing disc, which can connect to the nozzle channel 27.

När en skruv ska sugas upp och hållas fast med hjälp av undertryck öppnas avstängningsventilen 7 (fig 1). Den genom luftinloppsstutsen 8 inströmmande luften trycks genom sidoluftöppningen 21 och luftkanalen 25 med tillhörande munstycks- öppning 26, och strömmar genom munstycksöppningen 27 in i en förbindelsekanal 10. Därvid suger den med sig luft genom munstycksöppningen 28, så att det upp- står en sugluftström i undertryckskanalen 16, kopplingshuset 12 och plock- och hållhylsan 13. När en skruv sugts fast trycks den med hjälp av skruvbladet 19 in i sitt skruvhål. Den därvid uppkommande tryckkraften övervinner tryckkraften från fjädern 24, så att munstycksöppningen 20 för motorns 2 drivlufttillförsel öppnas. När skruvmotorns 2 utblåsningsluft strömmar ut bildas det i förbindelse- kanalen 10 ett övertryck, som via munstyckskanalerna 27 och 28 verkar på back- ventilens 6 kula 29. Kulan 29 sluter till öppningen till undertryckskanalen 16.When a screw is to be sucked up and held by means of negative pressure, it is opened shut-off valve 7 (Fig. 1). The air flowing in through the air inlet nozzle 8 pressure through the side air opening 21 and the air duct 25 with associated nozzle opening 26, and flows through the nozzle opening 27 into a connecting channel 10. It then sucks air with it through the nozzle opening 28, so that it a suction air flow is in the negative pressure duct 16, the coupling housing 12 and the pick-up and the holding sleeve 13. When a screw is sucked in, it is pressed by means of the screw blade 19 into its screw hole. The resulting compressive force overcomes the compressive force from the spring 24, so that the nozzle opening 20 for the drive air supply of the engine 2 opens. When the exhaust air of the screw motor 2 flows out, it is formed in the connection the duct 10 has an overpressure which acts on the reverse via the nozzle ducts 27 and 28. ball 6 of the valve 6. The ball 29 closes to the opening of the negative pressure channel 16.

Så snart inskruvningsförloppet avslutats och skruvmejseln avlägsnas från skruven sluter tryckfjädern 24 och kulan 23 åter till munstycksöppningen 20. Luften börjar då omedelbart att åter strömma genom sidokanalen 21 till förbindningskanalen 1D, och en ny skruv kan sugas fast.As soon as the screw-in process is completed and the screwdriver is removed from the screw the compression spring 24 and the ball 23 close again to the nozzle opening 20. The air begins then immediately to flow again through the side channel 21 to the connecting channel 1D, and a new screw can be sucked in.

Vid utföringsexemplet enligt' fig 2 är skillnaden endast att avstängnings- ventilen 7 ersatts med en ann'an ventilkonstruktion. I denna konstruktion ingar en stång 33, som i sin inre ände är försedd med en ventilkägla 34 och i sin yttre ände med en tryckknopp 35. Stången 33 styrs i en kanal 36 i ett lock 37, som tillsluter huset 1 baktill. En mellan knoppen 35 och locket 37 insatt tryckfjäder 38 *strävar hela tiden att hålla kvar ventilkäglan 34 i dennas säte i luftkanalen 24.In the embodiment according to Fig. 2, the difference is only that the shut-off valve 7 has been replaced with another valve construction. In this construction ing a rod 33, which at its inner end is provided with a valve cone 34 and at its outer end with a push knob 35. The rod 33 is guided in a channel 36 in a lid 37, which the house 1 connects at the back. A compression spring inserted between the knob 35 and the cover 37 38 * constantly strives to keep the valve cone 34 in its seat in the air duct 24.

För att vid denna utföringsform starta insugningsluftströmmen måste tryck- knoppen 35 tryckas in i riktning mot locket 37. Därefter är funktionssättet samma som beskrivits i anslutning till fig 1.In order to start the intake air flow in this embodiment, the pressure the knob 35 is pressed in the direction of the lid 37. Thereafter, the mode of operation is the same as described in connection with Fig. 1.

Vid utföringsexemplet enligt fig 3 är en avstängningsventil liknande den i fig 2 visade anordnad på sådant sätt att dess tryckstang 39 med den tillhörande rnariöverknoppen 40 sticker ut åt sidan från huset 1. Tryckstångens 39 inre ände uppbär en kula 41, som av en tryckfjäder 42 belastas in i ett koniskt säte i injektorns S luftkanal 25. I detta fall har backventilen 6 utgått och en utblås- 1»In the exemplary embodiment according to Fig. 3, a shut-off valve is similar to that shown in Fig. 2 arranged in such a way that its push rod 39 with the associated The upper knob 40 protrudes to the side from the housing 1. The inner end of the push rod 39 carries a ball 41, which is loaded by a compression spring 42 into a conical seat in the air duct 25 of the injector S. In this case, the non-return valve 6 has gone out and 1 »

Claims

3 '455 582 air chamber 43 is directly connected to a separate muffler, which emits the exhaust air to the environment behind the tool. In this case, the muffler 11 thus only receives the exhaust air from the engine 2. In the same way as in Fig. 2, the suction air flow is started by pushing in the push rod 39 by means of the control knob 40. Also in this case the function otherwise corresponds to that described in connection with Figs. 1. Patent requirements:

Compressed air screwdriver with a device for supplying and holding a screw by means of suction air generated by ejector action, with a picking and holding sleeve (13) surrounding the chisel blade (19) and a side air opening (21) arranged on the air inlet side, which connects an air inlet chamber with an ejector nozzle (5), from which a negative pressure duct (16) goes to the plook and hall sleeve (13), characterized in that the suction air and the suction air generated from the inlet air diverted by a connecting duct (10) is led to the air outlet (10) 9) for the screwdriver's drive motor (2), that the exhaust air of the screwdriver motor (2) is kept separate from the negative pressure duct (16) by the negative pressure vessel (16) containing a non-return valve (6), which lets the suction air flow unhindered but blocks the motor (2) is driven, and that the air exhaust nozzle (9) is arranged on the rear side of the rear part (3) of the screwdriver housing (1) and is equipped with a muffler (11).

Chisel according to Claim 1, characterized in that it is provided with a manually operable valve (7; 33-35; 39-41) for switching off the side air flow derived from the supply air flow from the motor (2), and thus the suction air flow.

Chisel according to Claim 2, characterized in that the valve consists of a screw valve (7). _

Chisel according to claim 2, characterized in that the valve (34; 41) is held in its shut-off position by the action of a compression spring (38; 42) and is connected to a push rod (33; 39) which is provided with a grip (35 ; 40) for opening the valve.

Chisel according to one of the preceding claims, characterized in that a chisel housing (1), which contains the motor (2), the ejector nozzle (5) and a control valve (4) for the motor (2), is connected to the pick-up and holding sleeve. (13) through a coupling housing (12).

Chisel according to claim 5, characterized! in that the housing of the chisel (1) is made with a negative pressure duct (16) for the suction air, while the coupling housing (12) and the picking and holding sleeve (13) in their entirety function as suction air conductor.

Chisel according to Claim 5 or 6, characterized in that a sealing plate (14) having an opening (15) for connecting the negative pressure duct (16) in the chisel housing (1) to the inner space of the coupling housing (12) is inserted between the chisel housing (1) and the coupling housing (12).

Chisel according to one of the preceding claims, characterized in that the exhaust fume is designed for arisluining to a central extraction system.