• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In a hammer drill, a drive piston is reciprocated by a motor, and, over a pneumatic buffer, the reciprocating motion is transmitted to a percussion piston. A throttle valve regulates the flow of a fuel mixture to the motor for controlling its operation. A membrane switch connected to and operated by the pressure conditions within the pneumatic buffer controls the throttle valve.
    公开号:SU867321A3
    申请号:SU792790901
    申请日:1979-07-19
    公开日:1981-09-23
    发明作者:Хроми Франц
    申请人:Хилти АГ；
    IPC主号:
    专利说明:

    Moreover, the actuating element is designed as a membrane switch.
    In addition, the air cushion and the membrane switch are connected by pipeline.
    Figure 1 shows the hammer drill with a hammer in the working position, longitudinal section; figure 2 - the same, in the rest position.
    The drill hammer consists of a cylinder 1, a tubular casing 2 enclosing it, as well as the body 3 shown by the contour line. The casing 2 is rotatably mounted with crank 4 / crankshaft during rotation by an internal combustion engine (ICE) 5. With crank 4 through the connecting rod neck b a connecting rod 7 is connected, which causes the driving piston 8 inside the cylinder 9 to reciprocate. Inside the cylinder 9 there is a shock piston 10, which slides the head 11 inside the cylinder 9, and a rod in the bore 12 of cylinder 1. The rod acts on the rear end of the tool 13, which is mounted below the front part of the cylinder 1, made in the form of the tool holder 14 . Inside the cylinder on the area facing the tool enter holes 15 and a equalizing hole 16 slightly displaced in the direction of the drive piston 8. The holes 15 and 16 communicate with the annular cavity 17 formed by the shell 2 and cylinder 1 17. A tubular adjustment line 18 also enters the cylinder 9 pipeline) connected to the membrane switch 19. A pusher 20 protrudes from the latter with a toothed rack 21, which enters the throttling line of the mixture supply to the internal combustion engine 5 and the control unit 22.
    Membrane switch 19 consists of two half-pans 23 and 24. A membrane 25 is fixed between them, which keeps the pusher 20 from moving in the center. A sigil-shaped stop 26 limits the diaphragm running in one direction. By means of a spring 27, the membrane is pressed from the stop 26. The pusher 20 connected to the membrane determines, when it is moved, by engaging the rack 21 with the gear 28 and the associated throttle valve 29, passing through the choke section of the tube 30. As indicated by the arrows, the mixture penetrates through the choke from the carburetor not shown in the figure to the engine combustion chamber 5.
    When the drill hammer is operated, as shown in Fig. 1, an airbag is created in the cavity of the cylinder between the head of the shock piston 10 and the drive piston 8, which, due to the movement of the drive piston 8,
    protects the shock piston reciprocating motion.
    The holes 15 then perform the rear: 5 hours to prevent the formation of the shock piston 10 in front of its head when braking an airbag is prevented. The holes 15 also have the task of avoiding the formation of unwanted vacuum in front of the head of the shock piston during reciprocating the drive piston 8 by suctioning air from the annular cavity 17. Hole 16 compensates for losses due to leakage due to leakage of the piston.
    In Figure 1, the drive piston is shown in the forward operating position, with an airbag between the drive piston and the head pushing the impact piston 10 forward to hit the tool 13. The next rotation of the crank 4 causes the drive piston 8 to return, and the airbag again contributes movement of the shock piston 10. The opening of the entry line 18 of the control into the cylinder cavity is released while the driving piston 8, so that the pressure of the air cushion propagates through the line 18 and the membrane switch 19. The pressure The airbag is exposed to 8 oscillations during lifting of the driving piston, and at the moment of maximum contact between the shock piston 10 and the driving piston 8 a significant pressure peak occurs.
    The integral of the change in pressure of the air cushion ensures that the membrane 25 is pressed against the stop 26. In this position of the membrane, the throttle valve 29 is held in the position corresponding to the maximum flow area | The engine, despite the large amount of the mixture supplied, operates to the BB1IDA of the shock piston 10 in the load speed mode.
    权利要求:
    Claims (2)
    [1]
    If, for example, the tool 13 is removed from the drill hammer, as shown in FIG. 2, the impact piston 10 occupies a forward position within the cylinder 9. There is no air cushion formed between the impact piston 10 and the drive piston 8, which drives the impact piston 10, since the cylinder cavity between the head and the drive piston communicates through the holes 15 with the annular cavity 17, so that constant air exchange takes place, the pressure corresponds to atmospheric pressure, so that it is not in the CONDITION-- to hold the membrane 25 more pressed against the stop 26, moreover, the compression spring 27 now moves the membrane in the receiving 23. This in turn causes the movement of the pusher 20 and the rotation of the throttle valve The damper 29, which throttles the flow of the mixture, so that the number of revolutions of the engine and when the percussion instrument is not working and associated with this reduction in power consumption does not exceed the number of revolutions under load. If the shock piston 10 is moved from the front rest position with the tool back in the direction towards the drive piston 8, then an airbag occurs between the pistons, which causes the shock piston to move, shifted in phase relative to the drive one ( 8. Since the engine, however, had previously worked only in the range of relatively low load speeds, the re-connection of the shock 10 does not result in load peaks that could damage the hammer. An internal combustion engine driven hammer containing a guide cylinder that has a percussion piston reciprocating through an air cushion and a driving piston connected to the internal combustion engine, so that , in order to increase the service life of the drill bit, of the chute by limiting the number of revolutions of the drive engine when the shock piston is inoperative, the drill hammer is equipped with an actuator connected to an air cushion and a regulator connected with the actuator and the internal combustion engine. 2, Drill hammer according to claim 2, characterized in that the actuating member is designed as a membrane switch. 3. The hammer drill according to Claim 2, characterized in that the airbag and the membrane switch are connected by pipeline. Sources of information taken into account in the examination 1. The author's certificate of the USSR 621322, cl. E 21 C 3/18, 1973.
    [2]
    2. The patent of Germany No. 2461662, cl. E 21 C 3/18, published 1975 (prototype).
    f t7 2
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    同族专利:
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    BE877788A|1979-11-16|
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    NO147784B|1983-03-07|
    YU157379A|1983-01-21|
    CA1114249A|1981-12-15|
    NO792396L|1980-01-22|
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    FI65723C|1984-07-10|
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    引用文献:
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    US2522550A|1946-12-19|1950-09-19|Carl S Weyandt|Gas hammer speed control|
    US2622399A|1948-08-05|1952-12-23|David I Babitch|Windshield wiper motor|
    US2748561A|1951-08-23|1956-06-05|Carter Carburetor Corp|Vacuum motor electric booster|
    US3464500A|1967-11-16|1969-09-02|Gardner Denver Co|Percussion tool control means|
    US3921729A|1971-11-25|1975-11-25|Hilti Ag|Electropneumatic hammer|
    US3834469A|1972-11-14|1974-09-10|Wacker Werke Kg|Internal combustion operated hammer|
    US3835935A|1973-03-19|1974-09-17|Black & Decker Mfg Co|Idling system for power hammer|
    US4095654A|1976-11-15|1978-06-20|Ross Frederick W|Impact device with multiple connecting rods and gearing|
    US4099580A|1977-01-24|1978-07-11|Ross Frederick W|Impact device with linear air spring|CH669141A5|1986-04-04|1989-02-28|Sig Schweiz Industrieges|Through a pressure medium driven hammer.|
    DE3884522D1|1987-03-05|1993-11-04|Bosch Gmbh Robert|METHOD FOR INTERRUPTING THE DRIVING ACTIVITY, IN PARTICULAR THE BLOWING AND / OR ROTATING ACTIVITY, OF A HAND MACHINE TOOL.|
    SU1617139A1|1988-08-09|1990-12-30|Московское Научно-Производственное Объединение По Механизированному Строительному Инструменту И Отделочным Машинам|Compression-vacuum percussive machine|
    SE501200C2|1989-10-28|1994-12-05|Berema Atlas Copco Ab|Striking Tools|
    ZA908924B|1990-01-15|1991-08-28|Sulzer Ag|A percussion device|
    JP3563182B2|1995-11-13|2004-09-08|丸善工業株式会社|Engine breaker|
    US5954140A|1997-06-18|1999-09-21|Milwaukee Electric Tool Corporation|Rotary hammer with improved pneumatic drive system|
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    US8002160B2|2004-08-30|2011-08-23|Black & Decker Inc.|Combustion fastener|
    US7886840B2|2008-05-05|2011-02-15|Ingersoll-Rand Company|Motor assembly for pneumatic tool|
    US8122907B2|2008-05-05|2012-02-28|Ingersoll-Rand Company|Motor assembly for pneumatic tool|
    DE102008044044A1|2008-11-25|2010-05-27|Robert Bosch Gmbh|Hand machine tool device|
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    US9022888B2|2013-03-12|2015-05-05|Ingersoll-Rand Company|Angle impact tool|
    CA3146951A1|2014-03-27|2015-10-01|Techtronic Power Tools Technology Limited|Powered fastener driver and operating method thereof|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE19782832169|DE2832169A1|1978-07-21|1978-07-21|MOTORIZED DRILLING HAMMER|
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