Classifications

• • 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
  • B25D17/06—Hammer pistons; Anvils ; Guide-sleeves for pistons
• • 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
  • B25D17/24—Damping the reaction force
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2222/00—Materials of the tool or the workpiece
  • B25D2222/21—Metals
  • B25D2222/42—Steel
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2222/00—Materials of the tool or the workpiece
  • B25D2222/54—Plastics
  • B25D2222/57—Elastomers, e.g. rubber
• • 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
  • B25D2250/191—Ram catchers for stopping the ram when entering idling mode
• • 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
  • B25D2250/365—Use of seals

Definitions

• the invention is based on a percussion mechanism and a hand-held power tool which can be driven at least in a hammering manner with a percussion mechanism according to the preambles of the independent claims.
• a percussion mechanism of hand tools which can be driven in a hammering manner, for example drills and / or percussion hammers, frequently transmits a so-called striker or firing pin, which is mounted axially displaceably in a firing pin guide and on the drive side by a percussion hammer in Bohr - Or impact direction is subjected to shocks. Impact energy of the impacts is transmitted by the firing pin to a drive-side front end of the tool received in the tool holder. A filled with lubricant interior of the striking drivable power tool is thus sealed to the outside.
• the firing pin which is usually made of steel, is guided hard in the tool holder or in a hammer tube made of steel which adjoins the tool holder on the drive side.
• This solution consists of a large number of individual parts whose production requires precise machining. In particular, certain minimum tolerances must not be exceeded when machining contact surfaces of the firing pin and the tool holder or the hammer tube in order to keep the components in the head line and thus to ensure low lateral forces.
• the proposed solution of steel is thus very expensive.
• a firing pin guide made of elastomeric material in which the firing pin is guided elastically.
• the firing pin guide is made in one piece or in several parts.
• the use of elastomeric material provides a cost effective solution.
• the disadvantage here is that a reflection behavior of the elastomeric material is different from that of steel, which has unfavorable effects on the idling function, which is not a problem in the previous steel solution.
• the expected service life is lower when used in higher-quality equipment, which in turn adversely affects the cost factor.
• a firing pin guide comprises a body surrounding the firing pin and annular in cross-section, which is formed from at least two materials of different hardness.
• a drive-side part of the body is preferably formed from an elastomer, and a tool-side part of the body made from steel.
• the advantage here is that by using steel compared to the elastomeric material in the tool-side part of the body a much better transition of the percussion from a percussion function is achieved in an idle function.
• the proposed component has a longer service life compared to the pure elastomer solution.
• another material such as plastic or the like may be used.
• the body is made in two parts with a drive-side part of the body of the elastomeric material and a tool-side part of the body made of steel.
• the two parts have a continuous axial formation for the firing pin, wherein the firing pin is limited axially displaceable in the recess between an idle position and an impact position.
• they have molded parts of the body a guiding function for the firing pin.
• the tool-side part of the body may have an inner idle stop contact shoulder, against which the firing pin rests in idle mode.
• the drive-side part of the body preferably has a B-stop stop shoulder, which dampens the rebound of the firing pin after the transmission of the impact pulse to the tool. Due to the inventive design of the drive-side part of the body made of elastomer, the deceleration of the firing pin is damped in its backward movement in impact mode.
• a sealing element In one embodiment of the invention can be arranged on a on an inner and / or outer circumferential surface of the drive-side part of the body, a sealing element.
• a sealing element surrounds the firing pin annularly.
• the drive-side part of the body can be shaped so that it fulfills one or more other functions in addition to the guidance of the firing pin, such as a sealing function and / or a damping function in idle or B-stroke to dampen the resulting recoil and to support the drill in the device.
• a club catcher ring may be integrated with the drive-side portion of the body to catch the racket idling.
• a separate racquet catch ring may be provided instead of the integrated in the drive-side part of the body racquet catch.
• a standard sealing ring can be used, which leads to a simplification of the tool structure.
• the tool-side part of the body is designed to be longer than the drive-side part.
• an aspect ratio between the tool-side and the drive-side part of the body may be reversed, wherein the drive-side part of the body is formed longer than the tool-side part.
• Fig. 1 is a partial longitudinal sectional view of an at least beating drivable
• Fig. 2a, b is an enlarged view of a drive-side part (Fig. 2a) and a tool-side part (Fig. 2b) of the firing pin guide.
• a part of an electric hand drill or a percussion hammer with a striking mechanism is shown in longitudinal section.
• the impact mechanism essentially comprises a firing pin guide 11 and a firing pin guide 11 axially displaceable firing pin 12, the impact pulse of a racket 20 of driven by a drive motor not shown hand hammer or percussion hammer percussion on a in one Tool holder 10 of the same inserted drilling or impact tool 19 transmits.
• the firing pin 12 is made of solid steel and consists of two elongated cylindrical end portions 21a, 21b and the two end portions 21a, 21b connecting and arranged between these radially thickened Mitteilteil 22nd
• the firing pin guide 11 extends over the entire length of the firing pin 12 and comprises a hammer tube 23 which is supported in a housing 24 of the hammer or percussion hammer in the axial direction.
• a body 13 is fixed.
• the hammer tube 23 consists of two pipe sections 23 ', 23 "connected by a conical annular shoulder 32, of which the front tool-side pipe section 23" has a smaller diameter and forms the tool holder 10.
• the rear tube section 23 ' has a larger diameter and is open at its rear end, so that the body 13, the firing pin 12, the racket 20 and an impactor acting on the racket 20 piston 25 of the striking mechanism from this side into the hammer tube 23rd can be introduced.
• an air cushion space 26 is formed in the hammer tube 23, which can be vented through radial air holes (not shown) in the wall of the hammer tube 23.
• the held by the hammer tube 23 body 13 is annular in cross-section and formed of two materials with different hardness.
• the body 13 is formed in two parts with a drive-side part 14 and a tool-side part 15.
• the drive-side part 14 of the body 13 is formed of an elastomer, and the tool-side part 14 of the body 13 made of steel.
• the drive-side part 14 of the body 13 has a greater axial longitudinal extent than the tool-side part 15.
• the two parts 14, 15 have a continuous axial recess 27 for the firing pin 12.
• the drive-side part 14 has a B-drive on the drive side Stop shoulder 17, which dampens the rebound of the firing pin 12 after the transmission of the impact pulse on the tool 19.
• the tool-side part 15 of the body 13 has on the tool side an inner idle stop contact shoulder 16, against which the firing pin 12 rests in idle mode.
• the firing pin 12 is thus limited axially displaceable in the recess 27 formed by the parts 14, 15 between an idle position and an impact position.
• the parts 14, 15 thus serve the leadership for the firing pin 12th
• FIG. 2 a shows a detailed view of the drive-side part 14 of the body 13 with the B-stop stop shoulder 17 and FIG. 2 b shows a detail view of the tool-side part 15 of the body 13 with the idle stop contact shoulder 16.
• the parts 14, 15 each form a recess 27, in which the firing pin 12, not shown here, is axially displaceable.
• the parts 14, 15 are shaped so that even more functions can be integrated.
• a racket catch ring 18 is integrated to catch the racket 20 at idle.
• the beater collar 18 is arranged on the drive side and thickened bead-shaped at its free, drive in the installed state end.
• the club catching ring 18 is formed axially projecting.
• An inner diameter of the Schlägerfangrings 18 is smaller than an outer diameter of a thickened tool side, shown in Fig. 1 front end 30 of the racket 20.
• the Schlägerfangring 18 is connected via a hollow cylindrical neck portion 28 to the part 14.
• the neck portion 28 has a relation to the inner diameter of the Schlägerfangrings 18 expanded inner diameter.
• the drive-side part 14 of the body 13 is shaped so that it performs other functions in addition to the leadership of the firing pin 12 and the bat catching function, such as a sealing function and / or a damping function in idle or B-stroke to dampen the resulting recoil and support the drill in the device.
• This can be achieved, for example, by a plurality of circumferential grooves 31 can be achieved, which are arranged on the tool-side end of the drive-side part 14 in the installed state.
• the tool-side part 15 of the body 13 is formed in the manner of a steel sleeve and the tool side includes the inner idle impact abutment shoulder 16.
• An outer surface 33 of the part 15 tapers on the tool side corresponding to an annular shoulder 32 of the hammer tube 23 complementary formed shape.
• the outer surface 33 of the part 15 can be supported on the annular shoulder 32.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=36930392

Family Applications (1)

Country Status (7)

Families Citing this family (8)

Family Cites Families (12)

• 2005
  • 2005-07-27 DE DE102005035099A patent/DE102005035099A1/de not_active Withdrawn
• 2006
  • 2006-06-22 DE DE502006008238T patent/DE502006008238D1/de active Active
  • 2006-06-22 CN CNA2006800270837A patent/CN101228008A/zh active Pending
  • 2006-06-22 WO PCT/EP2006/063468 patent/WO2007012527A1/fr active Application Filing
  • 2006-06-22 US US11/575,994 patent/US20080245220A1/en not_active Abandoned
  • 2006-06-22 AT AT06777416T patent/ATE486695T1/de active
  • 2006-06-22 ES ES06777416T patent/ES2354626T3/es active Active
  • 2006-06-22 EP EP06777416A patent/EP1910039B1/fr active Active

Non-Patent Citations (1)

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