US3774699A - Hammer drill with slidable rotation gear and lock - Google Patents

Hammer drill with slidable rotation gear and lock Download PDF

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Publication number
US3774699A
US3774699A US00274050A US3774699DA US3774699A US 3774699 A US3774699 A US 3774699A US 00274050 A US00274050 A US 00274050A US 3774699D A US3774699D A US 3774699DA US 3774699 A US3774699 A US 3774699A
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US
United States
Prior art keywords
gear wheel
pinion
cylinder
drill
hammer drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00274050A
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English (en)
Inventor
P Schmuck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
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Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
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Publication of US3774699A publication Critical patent/US3774699A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/003—Crossed drill and motor spindles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0046—Preventing rotation

Definitions

  • ABSTRACT An electric hammer drill is constructed to provide both striking and rotating motions for a tool mounted in the drill. Further, the rotational motion is provided by a gear wheel which, in turn, is driven by a pinion. If only striking motion is to be transmitted to the tool, the gear wheel can be disengaged from the pinion and, if required, the gear wheel in its disengaged position can be locked against rotational movement. The gear wheel is normally biased into engagement with the pinion. An operating lever is positioned on the hammer drill for selecting the desired arrangement of the gear wheel.
  • the invention is directed to an electric hammer drill in which the driving force has two components, one for effecting a striking or impact movement of a tool mounted in the drill and the other for imparting a rotational movement to the tool and, more particularly, it concerns the arrangement of a gear wheel engageably with a pinion for effecting the rotational movement and disengageable from the pinion when the driving force is transmitted only in the form of a striking movement.
  • Hammer drills of the type mentioned above are practically unlimited in their uses. Frequently such hammer drills are used for inserting rapid core drill anchors and for chipping. When the drills are used for chipping as well as for setting rapid core drill anchors, particularly during the initial part of the drilling action and when driving in the expansion body, only a striking or impact movement is provided on the tool. Therefore, it is necessary that the rotational movement of the hammer drill be discontinued so that only the striking movement can be performed.
  • a gear wheel for effecting rotational movement of the drill, is arranged to be driven by a pinion so that it can be displaced axially of the drill relative to the pinion for shutting off the rotational movement of the drill.
  • This feature of the axial displacement of the gear wheel has the advantage that it can be effected by a simple manipulation of the hammer drill itself.
  • the ability to switch between the combination of striking and rotational movement and pure striking movement is of particular advantage in setting rapid core drill anchors, since an accurate insertion is frequently only possible when the anchor is driven into the target material under a pure impacting action before the actual insertion process is effected which is performed by a combination of rotational and striking movements.
  • a compression spring is arranged in contact with the gear wheel for biasing it toward the driving pinion.
  • the engagement and disengagement of the gear wheel with the driving pinion is effected by means of a slide positioned within the hammer drill casing which can be displaced in the direction of the tool axis of the drill.
  • a locking element is associated with the slide, movable in the direction of the tool axis, for holding the gear wheel against rotational movement.
  • the locking member For locking the gear wheel when it is disengaged from the driving pinion, the locking member is arranged so that it engages the teeth of the gear wheel. Accordingly, the locking element can be provided with cams or with an arrangement of teeth which correspond to the teeth on the gear wheel.
  • an operating lever is provided on the exterior of the drill casing for axially displacing the members within the casing which effect the displacement of the gear wheel from engagement with the driving pinion.
  • an operating lever it is also possible to provide markings on the drill casing so that the position of the gear wheel can be easily determined.
  • the operating lever has a cam which extends into the casing and engages within slots in the members which effect the displacement and locking of the gear wheel.
  • the slots are arranged so that in movement of the operating lever from the position where the gear wheel and driving'pinion are engaged, initially the gear wheel is uncoupled and the tool can still be rotated and in the subsequent movement of the lever the gear wheel is locked so that the tool cannot be rotated.
  • the cam releases the locking action and then permits the spring to bias the gear wheel into engagement with the driving pinion. Due to these automatic operations, disengagement-locking, unlockingengagement, faulty control of the hammer drill is impossible, that is, it is not possible to lock the gear wheel as long as it remains in meshed engagement with the driving pinion.
  • FIG. 1 is a side view, partly in section, of a hammer drill embodying the present invention
  • FIG. 2 is a top view of a portion of the hammer drill shown in FIG. 1;
  • FIG. 3 is a partial sectional view, similar to FIG. 1, showing certain of the parts within the drill displaced into a second position, as compared to that shown in FIG. 1;
  • FIG. 4 is a view, similar to FIG. 2, showing the corresponding arrangement of certain of the displaced parts in FIG. 3;
  • FIG. 5 is a partial view, similar to FIG. 3, but with certain of the parts within the hammer drill displaced into a third position;
  • FIG. 6 is a view similar to FIGS. 2 and 4 indicating the displaced arrangement of the parts shown in FIG.
  • FIG. 7 is a view taken along the line VII-VII in FIG. 1;
  • FIG. 8 is a partial top view of the hammer drill as viewed in the direction of the arrow A in FIG. 1.
  • a hammer drill consists of a motor casing 1 attached to a gear casing 2 with a handle 3 extending from the two casings and containing a pushbutton switch 4.
  • the motor within the casing is arranged to provide a driving force to the drill having a striking or impact component and a rotational component.
  • the driving force of the motor is tranmitted from the driving pinion 1a to a gear wheel 5 fixed on a crank shaft 7.
  • the crank shaft is rotationally supported within the gear casing 2 within a bearing 6 and gear teeth 7a on the crank shaft mesh with the teeth on a gear wheel 8 positioned laterally of the crank shaft.
  • the gear wheel 8 is secured on a bevel pinion shaft supported in a bearing 9 in the gear casing 2.
  • One end of the shaft 10 is mounted in the end face 1b of the motor casing 1 while its other end forms a bevel pinion 11 shown in meshed engagement with a gear wheel 12 in FIG. 1.
  • crank shaft 7 As the crank shaft 7 is rotated, it provides a reciprocating motion by means of crank pin 7b to a connecting rod 13 extending into one end of a cylinder 14 located within the gear casing 2.
  • a piston 15 is mounted on the opposite end of the connecting rod from the crank pin 7 and is spaced in the axial direction of the cylinder from a piston 16 by a chamber 17 extending between the two pistons.
  • the chamber 17 contains an air cushion so that the reciprocating action of the piston 15 is transmitted to the piston 16.
  • the kinetic energy of the piston 16 is transmitted by way of its piston shaft 16b to the shank of a tool 19 positioned within the tool holder 18.
  • the tool 19 is secured in the tool holder 18 in a known manner, for example, by means of locking elements for effecting longitudinal displacement while holding the tool against rotation.
  • the transmission of rotational movement to the tool 19 is provided by means of the cylinder 14 secured to the tool holder 18 and extending rearwardly into the gear casing 2 of the hammer drill.
  • the cylinder 14 is rotatably mounted in bearings 20, 21 for performing the rotational movement transmitted to the cylinder 14 from the gear wheel 12 concentrically mounted on the cylinder.
  • a key 22 affords then nonrotatable connection of the gear wheel 12 of the cylinder 14.
  • the gear wheel is mounted on the cylinder 14 so that it can be displaced in the axial direction of the cylinder and a spring 23 encircling the cylinder normally biases the gear wheel into meshed engagement with the pinion 11.
  • a slidably displaceable ring 24 On the rearward end of the cylinder 14 is a slidably displaceable ring 24 which is in contact with the rearward end of the gear wheel 12. In contact with the rearward end of the ring 24, that is the opposite end from the one in contact with the gear wheel 12, is a slide 25 displaceable in the axial direction of the cylinder 14. Located above the slide 25 is a locking member or element 26. As can be seen in FIGS. 2, 4 and 6, each of the slide 25 and the locking element 26 contain an oval-shaped slot 25a, 260, respectively. Positioned on the exterior of the gear casing 2 is a operating lever 28 having an eccentrically arranged cam 27 which extends downwardly into the slots 25a, 26a.
  • the operating lever 28 is pivotally mounted on the casing so that as it pivots or rotates the eccentrically arranged cam 27 effects an axial displacement of the slide 25 and the locking element 26.
  • the locking element 26 At its forward end, that is the end adjacent the gear wheel 12, the locking element 26 is rounded and has teeth 26 b arranged to mesh with the teeth on the gear wheel, note FIG. 7.
  • a locking element 30, loaded by a spring 29, is arranged in the operating lever 28.
  • the hammer drill is shown corresponding to the operating lever position I illustrated in FIG. 8.
  • the gear wheel 12 is in meshed engagement with the pinion ll, accordingly, striking or impact movements are transmitted over the crank shaft 7 and the connecting rod 13 and rotational movement is transmitted over pinion shaft 10 from pinion 1 1 to gear wheel 12 which rotates the cylinder 14.
  • the locking element 26 is shown with its rearward end aligned above the rearward end of the slide and its forward end displaced rearwardly from the gear wheel 12.
  • the forward end of the slide 25 contacts the ring 24 which in turn is in contact with the rearward end of the gear wheel 12, that is the end which is in meshed engagement, in FIG. 1, with the pinion 11.
  • the cam 27 is positioned at one end of the slots 25a, 26a which extend obliquely to one another and to the axial direction of the cylinder 14 in the hammer drill.
  • FIG. 4 the position of the slide 25 and locking element 26 are shown corresponding to the lever position II as shown in FIG. 3.
  • the cam 25 has moved from the ends of the slots 25a, 26a to an intermediate position, thereby displacing the slide and locking element relative to one another
  • the hammer drill is arranged in correspondence with lever position III illustrated in FIG. 8.
  • the gear wheel 12 is displaced axially from the pinion 11 so that, as in FIG. 3, only a striking action on the tool 19 can be effected.
  • FIG. 5 as compared to FIG.
  • the locking element has been displaced forwardly by the cam 27 on the operating lever so that its teeth 26b are in meshed engagement with the teeth on the gear wheel and the gear wheel 12, the cylinder 14 and the tool 19 are secured against rotational movement.
  • This particular position is especially suitable for using the hammer drill with chisels, since the chisel within the tool holder 18 can be guided by the hammer drill without the use of a chisel handle, because the tool is prevented from rotating.
  • said first means comprises an axially extending spring located within said casing encircling said cylinder, said spring disposed in contact with said gear wheel on the side thereof spaced from said pinion for biasing said gear wheel toward said pinion.
  • said second means for displacing said gear wheel from meshed engagement includes a slide member located within said casing and displaceable in the axial direction of the rotating and striking motion for displacing said gear wheel from engagement with said pinion, and said slide located on the opposite side of said gear wheel from said spring.
  • said second means for displacing said gear wheel from meshed engagement includes a locking element displaceable in the same direction as said slide for locking said gear wheel against rotational movement when it is displaced from meshed engagement with said pinion.
  • Electric hammer drill as set forth in claim 5, wherein an operating lever is pivotally mounted on said casing and is in operative engagement with said slide and locking element for selectively positioning them in accordance with the desired movement to be imparted to the tool.
  • each of said slide member and locking element has a slot extending obliquely of the axial direction of said cylinder and of one another, and a cam eccentrically arranged on said operating lever and extending through each of said slots for axially displacing said slide member and said locking element as said operating lever is pivoted on said casing.
  • Electric drill hammer as set forth in claim 8, wherein a key is arranged for securing said gear wheel to said cylinder for preventing rotational movement of said gear wheel relative to said cylinder and for affording axial movement of said gear wheel relative to said cylinder.
  • Electric hammer drill as set forth in claim 9, wherein a ring is slidably mounted on said cylinder between said gear wheel and said slide member for transmitting the axial movement of said slide member toward said gear wheel to said gear wheel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)
US00274050A 1971-07-21 1972-07-21 Hammer drill with slidable rotation gear and lock Expired - Lifetime US3774699A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2136523A DE2136523C3 (de) 1971-07-21 1971-07-21 Elektrobohrhammer

Publications (1)

Publication Number Publication Date
US3774699A true US3774699A (en) 1973-11-27

Family

ID=5814369

Family Applications (1)

Application Number Title Priority Date Filing Date
US00274050A Expired - Lifetime US3774699A (en) 1971-07-21 1972-07-21 Hammer drill with slidable rotation gear and lock

Country Status (20)

Country Link
US (1) US3774699A (pl)
JP (1) JPS5427801B1 (pl)
AT (1) AT312483B (pl)
AU (1) AU451336B2 (pl)
BE (1) BE785328A (pl)
CA (1) CA989211A (pl)
CH (1) CH539492A (pl)
CS (1) CS154207B2 (pl)
DE (1) DE2136523C3 (pl)
DK (1) DK151246C (pl)
FI (1) FI58084C (pl)
FR (1) FR2146732A5 (pl)
GB (1) GB1364961A (pl)
HU (1) HU166236B (pl)
IE (1) IE36566B1 (pl)
IT (1) IT956110B (pl)
NL (1) NL175273C (pl)
NO (1) NO134711C (pl)
SE (1) SE384337B (pl)
ZA (1) ZA724192B (pl)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874460A (en) * 1972-10-28 1975-04-01 Bosch Gmbh Robert Impact wrench
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4280359A (en) * 1974-10-16 1981-07-28 Robert Bosch Gmbh Rotary cam drive for impact tool
US4346767A (en) * 1980-06-11 1982-08-31 Kango Electric Hammers Limited Rotary impact drill
US4506743A (en) * 1981-11-13 1985-03-26 Black & Decker Inc. Latching arrangement for power tools
US4550788A (en) * 1983-11-08 1985-11-05 The Board Of Trustees Of The University Of Alabama Roof bolt hole groover
DE3503173A1 (de) * 1985-01-31 1986-08-07 Willy 7457 Bisingen Kress Stellglied zum umschalten von betriebszustaenden von elektro(hand)werkzeugen und verfahren zu seiner montage
AU575251B2 (en) * 1985-05-08 1988-07-21 Hilti Aktiengesellschaft Dual action rotary or impact drill hammer
US4763733A (en) * 1985-10-26 1988-08-16 Hilti Aktiengesellschaft Hammer drill with rotational lock
US5111889A (en) * 1990-03-29 1992-05-12 Hilti Aktiengesellschaft Drilling tool speed shifting unit
US5111890A (en) * 1988-08-02 1992-05-12 Robert Bosch Gmbh Hammer drill
US5379848A (en) * 1991-10-25 1995-01-10 Robert Bosch Gmbh Drill hammer
US6015017A (en) * 1997-04-18 2000-01-18 Black & Decker Inc. Rotary hammer
US6109364A (en) * 1995-11-24 2000-08-29 Black & Decker Inc. Rotary hammer
US6131671A (en) * 1995-12-25 2000-10-17 Makita Corporation Power-driven tool having a mechanism for setting the rotary angle position of a tool bit
US20020125020A1 (en) * 2001-03-12 2002-09-12 Josef Funfer Switch assembly for a combined hand tool device
US6488195B2 (en) 1998-09-18 2002-12-03 Stanley Fastening Systems, L.P. Multi-stroke fastening device
US20030146007A1 (en) * 2002-02-07 2003-08-07 Ralf Greitmann Device for switching operating mode for hand tool
US6789630B2 (en) * 2000-03-03 2004-09-14 Skil Europe B.V. Electric hand tool
US20060065417A1 (en) * 2004-09-30 2006-03-30 Hilti Aktiengesellschaft Drilling and/or chusel hammer
US20060185866A1 (en) * 2005-02-24 2006-08-24 Achim Jung Hammer drill
US20070125563A1 (en) * 2005-12-02 2007-06-07 Makita Corporation Power tool
US20100012700A1 (en) * 2008-07-17 2010-01-21 Stanley Fastening Systems, Lp Fastener driving device with mode selector and trigger interlock
US20100252292A1 (en) * 2009-04-03 2010-10-07 Ingersoll-Rand Company Spindle locking assembly
US20150038970A1 (en) * 2012-11-14 2015-02-05 British Columbia Cancer Agency Branch Cannulated hammer drill attachment
US20160288308A1 (en) * 2015-03-30 2016-10-06 Robert Bosch Gmbh Protective Device at least for Protecting a User in the Event of an Uncontrolled Blockage of a Portable Power Tool

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2728961C2 (de) * 1977-06-27 1991-08-08 Hilti Ag, Schaan Bohrhammer mit arretierbarem Werkzeughalter
DE2757008C2 (de) * 1977-12-21 1982-04-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Pneumatischer Bohrhammer
DE2916499A1 (de) * 1979-04-24 1980-11-06 Duss Maschf Elektro-handbohrmaschine mit vorrichtung zur wahlweisen umstellung fuer drehendes oder schlagendes bohren
DE2917475A1 (de) * 1979-04-30 1980-11-13 Hilti Ag Bohr- oder meisselhammer
DE4202767C2 (de) * 1992-01-31 1999-06-02 Black & Decker Inc Bohrhammer
JP3424880B2 (ja) * 1995-08-18 2003-07-07 株式会社マキタ ハンマードリル
DE10111746A1 (de) * 2001-03-12 2002-09-19 Hilti Ag Schaltübertragungsmittel zur kombinierten Schaltung eines Getriebes
GB0311045D0 (en) 2003-05-14 2003-06-18 Black & Decker Inc Rotary hammer
CN108907269A (zh) * 2018-07-18 2018-11-30 徐州方达电机有限公司 一种用于机械零部件的高效加工生产装置
CN112247915A (zh) * 2020-11-11 2021-01-22 江苏铁锚工具有限公司 双马达交直流无刷电锤

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE596038C (de) * 1931-01-12 1934-04-25 Ragnar Erfass Mechanischer Hammer
US2807732A (en) * 1957-01-04 1957-09-24 Kurtovich Joseph Electric drill with built-in chuck key
DE1628056C3 (de) * 1960-12-10 1979-03-22 Skil Corp., Chicago, Ill. (V.St.A.) Drehschlaghammer mit als Freikolben arbeitendem Schlagkolben
DE1196608B (de) * 1962-10-04 1965-07-15 Duss Maschf Schlaggeraet, insbesondere Bohrhammer mit aufhebbarem Rotationsantrieb
DE1903434U (de) * 1964-03-07 1964-10-29 Duss Maschf Von hand gefuehrte tragbare elektrisch angetriebene werkzeugmaschine zur steinbearbeitung.
US3286776A (en) * 1964-06-23 1966-11-22 Kenneth Conklin Combination power hand tool
US3269466A (en) * 1964-07-17 1966-08-30 Rockwell Mfg Co Impact tool
FR1463994A (fr) * 1965-11-15 1966-07-22 Machine à percussion à commande pneumatique
DE1969990U (de) * 1967-07-31 1967-10-05 Hilti Ag Umschaltvorrichtung fuer elektro-pneumatische bohrhaemmer.

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3874460A (en) * 1972-10-28 1975-04-01 Bosch Gmbh Robert Impact wrench
US4280359A (en) * 1974-10-16 1981-07-28 Robert Bosch Gmbh Rotary cam drive for impact tool
US4066136A (en) * 1975-04-15 1978-01-03 Robert Bosch G.M.B.H. Torque and impulse transmitting machine
US4346767A (en) * 1980-06-11 1982-08-31 Kango Electric Hammers Limited Rotary impact drill
US4506743A (en) * 1981-11-13 1985-03-26 Black & Decker Inc. Latching arrangement for power tools
US4550788A (en) * 1983-11-08 1985-11-05 The Board Of Trustees Of The University Of Alabama Roof bolt hole groover
DE3503173A1 (de) * 1985-01-31 1986-08-07 Willy 7457 Bisingen Kress Stellglied zum umschalten von betriebszustaenden von elektro(hand)werkzeugen und verfahren zu seiner montage
AU575251B2 (en) * 1985-05-08 1988-07-21 Hilti Aktiengesellschaft Dual action rotary or impact drill hammer
US4763733A (en) * 1985-10-26 1988-08-16 Hilti Aktiengesellschaft Hammer drill with rotational lock
US5111890A (en) * 1988-08-02 1992-05-12 Robert Bosch Gmbh Hammer drill
US5111889A (en) * 1990-03-29 1992-05-12 Hilti Aktiengesellschaft Drilling tool speed shifting unit
US5379848A (en) * 1991-10-25 1995-01-10 Robert Bosch Gmbh Drill hammer
US6109364A (en) * 1995-11-24 2000-08-29 Black & Decker Inc. Rotary hammer
US6131671A (en) * 1995-12-25 2000-10-17 Makita Corporation Power-driven tool having a mechanism for setting the rotary angle position of a tool bit
US6015017A (en) * 1997-04-18 2000-01-18 Black & Decker Inc. Rotary hammer
US6488195B2 (en) 1998-09-18 2002-12-03 Stanley Fastening Systems, L.P. Multi-stroke fastening device
US6789630B2 (en) * 2000-03-03 2004-09-14 Skil Europe B.V. Electric hand tool
US20020125020A1 (en) * 2001-03-12 2002-09-12 Josef Funfer Switch assembly for a combined hand tool device
US6712156B2 (en) * 2001-03-12 2004-03-30 Hilti Aktiengesellschaft Switch assembly for a combined hand tool device
US20030146007A1 (en) * 2002-02-07 2003-08-07 Ralf Greitmann Device for switching operating mode for hand tool
US6976545B2 (en) * 2002-02-07 2005-12-20 Hilti Aktiengesellschaft Device for switching operating mode for hand tool
US20060065417A1 (en) * 2004-09-30 2006-03-30 Hilti Aktiengesellschaft Drilling and/or chusel hammer
US7398834B2 (en) * 2005-02-24 2008-07-15 Black & Decker Inc. Hammer drill with selective lock-on
US20060185866A1 (en) * 2005-02-24 2006-08-24 Achim Jung Hammer drill
US20070125563A1 (en) * 2005-12-02 2007-06-07 Makita Corporation Power tool
US7469752B2 (en) * 2005-12-02 2008-12-30 Makita Corporation Power tool
US20100012700A1 (en) * 2008-07-17 2010-01-21 Stanley Fastening Systems, Lp Fastener driving device with mode selector and trigger interlock
US8800835B2 (en) * 2008-07-17 2014-08-12 Stanley Fastening Systems, Lp Fastener driving device with mode selector and trigger interlock
US20100252292A1 (en) * 2009-04-03 2010-10-07 Ingersoll-Rand Company Spindle locking assembly
US8011444B2 (en) 2009-04-03 2011-09-06 Ingersoll Rand Company Spindle locking assembly
US20150038970A1 (en) * 2012-11-14 2015-02-05 British Columbia Cancer Agency Branch Cannulated hammer drill attachment
US9532789B2 (en) * 2012-11-14 2017-01-03 British Columbia Cancer Agency Branch Cannulated hammer drill attachment
US9615835B2 (en) 2012-11-14 2017-04-11 British Columbia Cancer Agency Branch Drill attachment for cannulated surgical drills
US20160288308A1 (en) * 2015-03-30 2016-10-06 Robert Bosch Gmbh Protective Device at least for Protecting a User in the Event of an Uncontrolled Blockage of a Portable Power Tool
US10682747B2 (en) * 2015-03-30 2020-06-16 Robert Bosch Gmbh Protective device at least for protecting a user in the event of an uncontrolled blockage of a portable power tool

Also Published As

Publication number Publication date
NO134711B (pl) 1976-08-23
SE384337B (sv) 1976-05-03
NO134711C (pl) 1976-12-01
DE2136523B2 (de) 1979-04-19
FI58084C (fi) 1980-12-10
DE2136523A1 (de) 1973-02-01
AU451336B2 (en) 1974-08-01
CA989211A (en) 1976-05-18
NL7207974A (pl) 1973-01-23
IT956110B (it) 1973-10-10
DK151246B (da) 1987-11-16
ZA724192B (en) 1973-03-28
AT312483B (de) 1974-01-10
CH539492A (de) 1973-07-31
DE2136523C3 (de) 1983-11-03
DK151246C (da) 1988-04-11
NL175273C (nl) 1984-10-16
IE36566L (en) 1973-01-21
HU166236B (pl) 1975-02-28
FI58084B (fi) 1980-08-29
IE36566B1 (en) 1976-12-08
FR2146732A5 (pl) 1973-03-02
GB1364961A (en) 1974-08-29
NL175273B (nl) 1984-05-16
JPS5427801B1 (pl) 1979-09-12
CS154207B2 (pl) 1974-03-29
BE785328A (fr) 1972-10-16
AU4428172A (en) 1974-01-10

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