US3371725A - Electric hammer drill attachment - Google Patents

Electric hammer drill attachment Download PDF

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Publication number
US3371725A
US3371725A US530868A US53086866A US3371725A US 3371725 A US3371725 A US 3371725A US 530868 A US530868 A US 530868A US 53086866 A US53086866 A US 53086866A US 3371725 A US3371725 A US 3371725A
Authority
US
United States
Prior art keywords
tool holder
hammer
barrel
cam ring
attachment
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
US530868A
Other languages
English (en)
Inventor
Jansen Johan Wilhelm
Hoffmann Hendrik
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.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3371725A publication Critical patent/US3371725A/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
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism
    • B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
    • B25D11/106—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool cam member and cam follower having the same shape

Definitions

  • a barrel has a front end in which a tool holder is coaxially journalled for rotation and for limited sliding movement from a first position, to which it is urged, to an extended second position.
  • a hammer member is reciprocable in the barrel and is normally urged into engagement with the inner end of the tool holder.
  • a drive shaft drives the tool holder for rotation thereof.
  • a pair of cooperating cam rings are so arranged in the barrel that, when the tool holder is in its second position, the tool holder only is rotated, and when the tool holder is in its first position, rotation of the tool holder is transmitted to one of the cam rings which in turn effects axial reciprocation of the other cam ring and thereby of the hammer which is operatively associated with the same, so that the hammer will strike axial blows upon the tool holder while the same rotates.
  • the retraction from the bore is made easy while stopping of the hammering action enables the drill to carry the loose grit particles along from the just drilled hole when it is retracted therefrom.
  • the single figure illustrates an embodiment of the in The motor housing is indicated by 1.
  • the barrel 2 of the hammer drill attachment is screwed onto a stub 22 of the motor housing 1.
  • the tool holder 3 is rotatably inserted in a bore provided at the bottom end 11 of the barrel 2 and serving as a bearing for the tool holder 3.
  • the barrel encloses a hammer block 4 loaded by a spring 6 which is placed between the upper surface of the hammer 4 and the motor housing stub 22.
  • the hammer block 4 is provided with a central bore 7 through which a driving shaft 8 extends.
  • This shaft 8 is coupled at one end to the motor shaft 9 for which purpose the shaft 8 has a polygonal cross section and the upper end is fitted in a cavity of the motor shaft 9 of corresponding cross section.
  • the polygonal driving shaft 8 is coupled at its other end to the head of the tool holder 3 by means of a corresponding polygonal cavity 10 provided therein.
  • the part 12 of the head of the tool holder 3 has also a polygonal shape corresponding to the shape of the inner walls of a central aperture in the bottom of the cup shaped cam ring 13 so that the tool holder head can slide in axial direction therein, but in the shown engaging position the cam ring 13 is rotated by the tool holder head, which in its turn is driven by the motor shaft 9 via the shaft 8.
  • the bottom of the cam ring 13 bears upon the bottom 11 of the barrel and is guided by the inner Wall of the barrel 2.
  • the cams 14 cooperate with corresponding cams 15 of an upper cam ring 16.
  • Side arms 17 attached to the head of the hammer block 4 rest upon the rim of the cam ring 16 and extend into longitudinal guiding grooves 5 in the inner wall of the barrel 2.
  • Roller rings 21 are provided for this purpose on the outer ends of the arms 17.
  • the outer wall of the hammer block 4 has a polygonal shape corresponding to the shape of the inner Wall of the cam ring 16, so that the latter is secured against rotation with respect to the hammer block 4, the latter being secured against rotation by means of the arms 17, which are guided in the grooves 5.
  • the cams 14 will move relatively to the earns 15, the hammer block 4 will be alternately lifted and thereupon fall downward again upon the top of the tool holder 3 in a hammering action under the pressure of the spring 6.
  • the diameter of the hammer block 4 is even a little larger than half the distance between the tool holder 3 and the front of the motor housing stub 22.
  • the diameter of the barrel 2 is large compared with its length and because of the above-mentioned relatively short distance a good stability of the tool holder is obtained.
  • the different parts, especially the loose cam rings 13 and 16, can easily be replaced and because they take the full inner width of the barrel 2, they can be built as solid bodies offering a large circumferential length for providing large cams which in turn provide a large lifting height for the hammer block 4.
  • the head of the tool holder 3 has above the coupling part 12 an upper end portion 23 of a smaller diameter than the part 12, so that the portion 23 is freely rotatable within the central aperture of the driven cam ring 13. Further, the length of engagement of the coupling end of the shaft 8 within the tool holder head surpasses the height by which the polygonal coupling part 12 extends into the cam ring 13 in the Working position as shown. Now when the drill is retracted from the drilled hole the polygonal part 12 is retracted from the central aperture in the cam ring 13, because of the known fact that frictional forces by the walls of the drilled hole make it necessary to pull the drill with some force from the drilled hole.
  • An elastic sealing ring 18 is interposed between the motor housing and the open end of the barrel 2 and another sealing ring 19 is interposed between the tool holder and the inner wall of the bearing thereof at the bottom end 11 of the barrel 2. Therefore, it is possible to fill the entire inner space of the barrel 2 with a lubricant. Further, the sealing ring 18 prevents the barrel 2 from being loosened from the motor housing under vibration.
  • An electric hammer drill attachment comprising a barrel which is fixable to a motor housing; a bearing provided in a leading end of said barrel; a rotatable tool holder received in said bearing and being movable axially of said barrel between a first and a second position, said tool holder having an end portion provided with an abutment face located in said barrel; biasing means biasing said tool holder to said first position; a motor shaft at the trailing end of said barrel; a drive shaft located in said barrel extending axially thereof between said motor shaft and said tool holder; an axially slidable rotary first cam ring surrounding said drive shaft in said barrel adjacent said tool holder and being provided with an axial recess facing said trailing end, and an axially slidable second cam ring concentric with said first cam ring and located intermediate the same and said motor shaft, said rings having opposed end faces provided with circumferentially curved and axially inclined abutting cam faces whereby, when said first cam ring rotates, said second
  • said second coupling means comprises a central aperture-in said first cam ring communicating with said recess and having a polygonal cross-section, a first section of said end portion of said tool holder having a complementary polygonal cross-sectional configuration and being slidably received in said central aperture when said tool holder is in said first position, and a second section located in said recess when said tool holder is in said first position and adapted to be freely rotatably and slidably received in said central aperture when said tool holder is in said second position.
  • said second coupling means further comprises an axial cavity of polygonal cross-section extending inwardly from said abutment face and having a length greater than the axial movement of said tool holder between said first and second positions thereof, and a terminal portion of said drive shaft received in said cavity and having a complementary polygonal cross-section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
US530868A 1965-03-05 1966-03-01 Electric hammer drill attachment Expired - Lifetime US3371725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL656502797A NL147356B (nl) 1965-03-05 1965-03-05 Hameraanzethuis voor een boormotorhuis.

Publications (1)

Publication Number Publication Date
US3371725A true US3371725A (en) 1968-03-05

Family

ID=19792572

Family Applications (1)

Application Number Title Priority Date Filing Date
US530868A Expired - Lifetime US3371725A (en) 1965-03-05 1966-03-01 Electric hammer drill attachment

Country Status (6)

Country Link
US (1) US3371725A (enrdf_load_stackoverflow)
BE (1) BE677249A (enrdf_load_stackoverflow)
CH (1) CH445257A (enrdf_load_stackoverflow)
DE (1) DE1577998C3 (enrdf_load_stackoverflow)
GB (1) GB1123452A (enrdf_load_stackoverflow)
NL (1) NL147356B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707087A (en) * 1971-06-16 1972-12-26 Hildaur L Neilsen Deburring devices
US3924692A (en) * 1974-02-06 1975-12-09 Illinois Tool Works Fastener driving tool
WO2014075184A1 (en) * 2012-11-14 2014-05-22 British Columbia Cancer Agency Branch A drill attachment for cannulated surgical drills
US20160303729A1 (en) * 2015-04-14 2016-10-20 Robert Bosch Gmbh Tool attachment for a handheld power tool
US11529148B2 (en) 2011-11-14 2022-12-20 The University Of British Columbia Intramedullary fixation system for management of pelvic and acetabular fractures
US11832856B2 (en) 2018-10-17 2023-12-05 The University Of British Columbia Bone-fixation device and system
US12023074B2 (en) 2014-10-14 2024-07-02 The University Of British Columbia Systems and methods for intermedullary bone fixation
US12167877B2 (en) 2014-03-06 2024-12-17 The University Of British Columbia Shape adaptable intramedullary fixation device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770455A (en) * 1904-09-20 Tool for working stone
US1665173A (en) * 1925-08-10 1928-04-03 John I Misener Hammer attachment for electric drills and the like
US3006202A (en) * 1958-03-17 1961-10-31 Samuel J Forbes Rotary and percussive tool
US3015244A (en) * 1956-04-19 1962-01-02 John P Newman Rotary impact hammer
US3149681A (en) * 1963-01-14 1964-09-22 Ambrose W Drew Rotary impact hammer
US3256946A (en) * 1962-05-14 1966-06-21 Huygmetaal Nv Hammer drill
US3270821A (en) * 1963-09-20 1966-09-06 Skil Corp Power tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US770455A (en) * 1904-09-20 Tool for working stone
US1665173A (en) * 1925-08-10 1928-04-03 John I Misener Hammer attachment for electric drills and the like
US3015244A (en) * 1956-04-19 1962-01-02 John P Newman Rotary impact hammer
US3006202A (en) * 1958-03-17 1961-10-31 Samuel J Forbes Rotary and percussive tool
US3256946A (en) * 1962-05-14 1966-06-21 Huygmetaal Nv Hammer drill
US3149681A (en) * 1963-01-14 1964-09-22 Ambrose W Drew Rotary impact hammer
US3270821A (en) * 1963-09-20 1966-09-06 Skil Corp Power tool

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3707087A (en) * 1971-06-16 1972-12-26 Hildaur L Neilsen Deburring devices
US3924692A (en) * 1974-02-06 1975-12-09 Illinois Tool Works Fastener driving tool
US11529148B2 (en) 2011-11-14 2022-12-20 The University Of British Columbia Intramedullary fixation system for management of pelvic and acetabular fractures
US20150038970A1 (en) * 2012-11-14 2015-02-05 British Columbia Cancer Agency Branch Cannulated hammer drill attachment
WO2014075165A1 (en) * 2012-11-14 2014-05-22 British Columbia Cancer Agency Branch Cannulated hammer drill attachment
CN104837427A (zh) * 2012-11-14 2015-08-12 不列颠哥伦比亚癌症机构分部 管状锤钻配件
EP2919689A4 (en) * 2012-11-14 2016-11-23 British Columbia Cancer Agency CANNULATED DRILL HAMMER 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
CN104837427B (zh) * 2012-11-14 2017-09-22 不列颠哥伦比亚癌症机构分部 管状锤钻配件
WO2014075184A1 (en) * 2012-11-14 2014-05-22 British Columbia Cancer Agency Branch A drill attachment for cannulated surgical drills
US12167877B2 (en) 2014-03-06 2024-12-17 The University Of British Columbia Shape adaptable intramedullary fixation device
US12023074B2 (en) 2014-10-14 2024-07-02 The University Of British Columbia Systems and methods for intermedullary bone fixation
US20160303729A1 (en) * 2015-04-14 2016-10-20 Robert Bosch Gmbh Tool attachment for a handheld power tool
US10661421B2 (en) * 2015-04-14 2020-05-26 Robert Bosch Gmbh Tool attachment for a handheld power tool
US11832856B2 (en) 2018-10-17 2023-12-05 The University Of British Columbia Bone-fixation device and system

Also Published As

Publication number Publication date
BE677249A (enrdf_load_stackoverflow) 1966-08-01
DE1577998A1 (de) 1970-02-26
NL6502797A (enrdf_load_stackoverflow) 1966-09-06
NL147356B (nl) 1975-10-15
DE1577998C3 (de) 1974-11-14
CH445257A (de) 1967-10-15
GB1123452A (en) 1968-08-14
DE1577998B2 (de) 1974-04-18

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