Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D11/00—Portable percussive tools with electromotor or other motor drive
  • B25D11/005—Arrangements for adjusting the stroke of the impulse member or for stopping the impact action when the tool is lifted from the working surface
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
  • B25D17/04—Handles; Handle mountings
  • B25D17/043—Handles resiliently mounted relative to the hammer housing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2217/00—Details of, or accessories for, portable power-driven percussive tools
  • B25D2217/0011—Details of anvils, guide-sleeves or pistons
  • B25D2217/0019—Guide-sleeves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
  • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves

Definitions

• Machine tool and method for operating a machine tool
• the invention relates to a machine tool, in particular hand tool, with a pneumatic percussion having a housing with at least one idle opening connecting an air cushion inside the percussion with ambient air in idle mode and with at least one, the releasing or blocking the idle opening serving closure element.
• a machine tool of the aforementioned type is known.
• An impact mechanism of the machine tool drives a tool, such as a chisel, periodically recurring abruptly.
• a piston displaced from an engine into axial reciprocation moves in a tubular housing, thereby driving a racket also carried in the housing via an air cushion located between the piston and the racket.
• the moving impact mass of the racket transmits the impulse when impacting on a tool element.
• the tool element may be the tool itself, a part of a tool holder, or a striker located between the tool and the racket.
• the machine tool has a firing pin, then in addition to the impulse transmission, it has the task of supporting the striking mechanism and in particular the racket when pressing the tool against a workpiece of a ner idle position to move to a working position.
• an operator presses the machine tool - for example in a hand tool - via a housing element on a contact shoulder of the firing pin to press the tool located in front of the firing pin against the workpiece and simultaneously move the bat in the direction of the piston in the working position.
• the tubular housing has at least one idling opening at the level of the air cushion lying between the piston and the racket. Such an idling opening can alternatively be closed by two types of closing elements in the working position of the percussion mechanism.
• the idling opening is arranged in the immediate vicinity of the racket, it may obstruct the idling opening when it is in the working position.
• the racket itself is the closing element.
• the firing pin or the tool holder actuated directly or via an intermediate element, a separate closing element in the outer region of the housing.
• the idling position of the closing element is dependent on the idling position of the firing pin, so that resonant vibrations can occur which adversely affect the idling of the machine tool.
• the machine tool according to the invention has a manual operating element displacing the closing element. Actuation of the closing element by the manual operating element makes it possible to release or block the idling opening independently of tool elements and / or elements of the impact mechanism arranged on the tool, so that the closing element can be operated precisely and unaffected by movements of the striking mechanism components. So that the operator does not have to consciously operate the closing element, the manual operating element can be equipped with a component be connected to the machine tool, which is operated by the operator also to operate a conventional machine tool.
• the manual control element acts on the closing element via an adjusting device.
• the control element can be arranged at a position independent of the impact mechanism on the machine tool.
• the adjusting device is a mechanical and / or electrical adjusting device.
• a movement of the manual control element can be used to mechanically adjust the position of the closing element.
• an adjusting device with mechanical and / or electrical components for example, an electric motor, which displaces the closing element via a gearbox, can be electrically controlled by means of at least one switch.
• At least one of the closing movement of the closing element counteracting return element is provided. If such a reset element is present, then only the closing movement itself must be caused by the manual control element.
• a return of the closing element in the neutral position (rest position) is made by the return element.
• the restoring element is designed so that the closing element reaches its idling position sufficiently quickly.
• the manual control element may in this case have a touch operation, after the end of the actuation of the hand control element, the closing element is automatically displaced by the restoring element in the idle position.
• the return element is designed as an elastic and / or pneumatic return element.
• the return element can be fixed for this purpose at a housing fixed point and is deformed by the attacking at another point closing element. This deformation is used to apply a restoring force that returns the closure member to the home position of neutral position.
• the elastic return element is a spring device.
• Spring devices are particularly suitable as return elements, since the deformation is intentionally directed when force is applied and spring devices have a constant elasticity even after a large number of deformation processes.
• there are different forms of usable spring devices which differ in their construction, in their dimensions and their functions - for example, as tension or compression springs.
• the manual control element is designed as a pressing element, with which the machine tool is pressed against a workpiece. If the operator applies a contact pressure to a position of the machine tool in order to press it with the tool against a workpiece, such as, for example, in the case of a hand tool machine designed as a hammer drill, this position can be a contact pressure element formed by the manual control element.
• this position can be a contact pressure element formed by the manual control element.
• the manual control element is designed as a handle.
• a handle can be used by the operator to pressing machine to the workpiece, where he can simultaneously guide the machine tool on the handle precisely.
• the manual control element is arranged vibration-isolating on the machine tool. If the manual control element is arranged vibration-isolating on the machine tool, then vibrations of the
• the closing element is isolated from the vibrations of the racket or the tool.
• an air spring device which attenuates the movement of the racket during idling operation is provided with an armature which can be actuated by the manual control element for pressure equalization of an air spring in impact operation via an outlet opening.
• the air spring may, for example, be arranged in front of the racket (between racket and firing pin) in a housing part of the impact mechanism.
• the housing has at this height outlet openings, which provide in impact mode for a pressure equalization between the air spring and the ambient air. In idle mode, these exhaust ports are closed by the valve, so that the movement of the racket is damped.
• the actuatable valve and the closing element of the idling opening can be embodied as one element, for example as a closing sleeve.
• the invention further relates to a method for operating a machine tool, in particular hand tool, with a pneumatic percussion having a housing with at least one idle opening which connects an air cushion inside the percussion mechanism with ambient air in idle mode and at least one, the idle opening associated closing element. It is provided that the closing element is actuated by an operator of the machine tool via a manual operating element. So that the operator does not have to additionally operate the manual control element, the manual control element can be connected to a component of the machine tool which the operator must operate to operate the machine tool.
• a movement of the racket during idling operation attenuating air spring device has a valve for pressure equalization of an air spring in impact mode over at least one outlet opening, which is operated by the operator of the machine tool via the manual control.
• Figure 1 is a schematic representation of a pneumatic
• Figure 2 is a schematic representation of a pneumatic
• FIG. 1 shows a machine tool 2 designed as a pneumatic hammer 1.
• a first end region 3 of a machine tool housing 4 has a tool holder 5 for receiving a tool, not shown. This tool may be in a pneumatic hammer 1, for example, a chisel, not shown.
• a first end region 3 opposite the second end region 6 of the machine tool housing 4 shows a characteristic of hand tools 7, as a handle. 8
• Above the handle 8 in the second end region 6 is a vibration-insulated, with the machine tool housing 4 pivotally connected handle 10.
• a percussion 12th In an intermediate region 11 of the machine tool 2, between the first end portion 3 and the second end portion 6, there is a percussion 12th , wherein only a few important elements of this impact mechanism 12 are shown.
• a tubular housing 14 of the hammer mechanism 12 extends along a main axis 13 of the machine tool 2 designed as a pneumatic hammer 1.
• a beater 15 Within this housing 14, a beater 15, an air cushion 16 and a piston 17 are arranged one behind the other along the main axis 13
• the area of the air cushion 16, the housing 14 idle openings 18 which extend from the inner region 19 of the impact mechanism 12 to the surrounding area 20 of the housing 14.
• a closing element 21 which is designed as a closing sleeve 22 which partially surrounds the tubular housing 14.
• the head end 23 of the closing sleeve 22 is supported at the front end 24 of a return element 26 designed as a spring element 25 (compression spring).
• the return element 26 in turn is connected with its rear end 27 with a housing-fixed support element 28.
• a pivotally mounted on the fixed point 30 the housing 14 of the striking mechanism 12 on one side or on both sides encompassing lever 31 connects.
• the lever 31 has at the height of the main axis 13 at least one aligned in the direction of the foot end 29 buckle 32, whereby the lever 31 touches the foot end 29 in at least one point 33.
• a fixed point 30 opposite end 34 of the lever 31 this is connected to a closing element 35 of a cable 36.
• An end element 35 opposite the terminating element 35 lies in a pivotable receptacle 38 of the grab handle 10.
• the cable 36 is guided through a bore 39 in the support element 28 and a bore 40 in a housing-fixed holding element 41 and is between the holes 39, 41 of a length-constant th, flexible hose 42 surrounded (Bowden cable).
• the lever 31 and the cable 36 with their elements together form an adjusting device 43.
• the handle 10 is formed bow-shaped, wherein it is pivotally connected in a first side region 44 in the pivot point 45 with the machine tool housing 4.
• the receptacle 38 and the pivot point 45 are arranged spaced apart in the side region 44 along the pivot axis 46.
• a second side region 47 which is opposite the first side region 44, is displaced about the pivot point 45 at its end 48 via a compression spring 49, approximately along the axis 50 relative to the machine tool housing 4.
• the handle 10 serves as a pressing element 51, with which an operator of the power tool 7 presses this against a workpiece.
• the handle 10 also serves as a manual control element 52, with which the operator actuates the idling openings 18 associated closing element 21. If the hand grip 52 designed as a handle 10 is not actuated, then the return element 26 presses the lock sleeve 22 in the direction of the idle position lever 31 so that the idle openings 18 are not covered.
• the operator pivots the handle 10 about the pivot point 45, for example by pressing the machine tool 2 with a tool against a workpiece and thereby pushes the handle 10 against the spring force of the compression spring 49 (arrow 53), he pivots the receptacle 38 with the End member 37 of the cable 36 about the pivot point 45 (arrow 54).
• the cable 36 is pulled by the pivoting movement of its end member 37 through the hose 42, wherein the opposite end member 35 is linearly drawn in the direction of the bore 39 (arrow 55).
• the cable 36 pivots with its end element 35 and the end 34 of the lever 31 about the fixed point 30 (arrow 56).
• the lever 31 presses with its ner buckle 32 on the foot end 29 of the closing sleeve 22, so that it moves against the spring force of the spring element 25 in the direction of the support member 28 while the idle openings 18 closes. If no pressure is exerted on the side region 47 of the handle 10, the cable 36 releases the lever 31 again and the spring element 25 can press the closing sleeve 22 in the direction of the end region 3 and the idling openings 18 are released again.
• FIG. 2 shows a further exemplary embodiment of the invention, wherein FIG. 2 essentially corresponds to FIG. 1, so that only the differences in the area of impact mechanism 12 and closing element 21 are to be discussed.
• the housing 14 of the percussion mechanism 12 is formed in an area in front of the racket 15 as Lucasfe- means 57 for impact damping of the racket 15 on a firing pin, not shown.
• the housing 14 has outlet openings 58 which can be released or blocked by a sleeve region 61 of the closing sleeve 22 designed as a fitting 60.
• closing sleeve 22 closing element 21 is extended in the direction of the air spring means 57 and has at the height of the curvature 32 of the lever 31, a closure sleeve 22 radially surrounded annular strip 62.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Percussive Tools And Related Accessories (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38335974

Family Applications (1)

Country Status (4)

Families Citing this family (10)

Family Cites Families (8)

• 2006
  • 2006-03-09 DE DE200610010892 patent/DE102006010892A1/de not_active Withdrawn
• 2007
  • 2007-01-16 WO PCT/EP2007/050383 patent/WO2007101736A1/de active Application Filing
  • 2007-01-16 EP EP07703898A patent/EP1996372A1/de not_active Withdrawn
  • 2007-01-16 CN CNA2007800084560A patent/CN101400485A/zh active Pending

Non-Patent Citations (1)

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