US3730281A - Drill hammer-drill mechanism for power tool - Google Patents

Drill hammer-drill mechanism for power tool Download PDF

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Publication number
US3730281A
US3730281A US00150339A US3730281DA US3730281A US 3730281 A US3730281 A US 3730281A US 00150339 A US00150339 A US 00150339A US 3730281D A US3730281D A US 3730281DA US 3730281 A US3730281 A US 3730281A
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US
United States
Prior art keywords
teeth
bearing
drive member
hammer
output shaft
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
US00150339A
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English (en)
Inventor
J Wood
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.)
Black and Decker Corp
Original Assignee
Black and Decker Manufacturing Co
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 Black and Decker Manufacturing Co filed Critical Black and Decker Manufacturing Co
Application granted granted Critical
Publication of US3730281A publication Critical patent/US3730281A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • 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
    • 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
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/062—Cam-actuated impulse-driving mechanisms
    • B25D2211/064—Axial cams, e.g. two camming surfaces coaxial with drill spindle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/18—Mechanical movements
    • Y10T74/18024—Rotary to reciprocating and rotary

Definitions

  • ABSTRACT A drillzhammer-drill arrangement is provided for a portable power tool wherein the hammering teeth are located immediately adjacent the: chuck portion of the tool and wherein one set of hammering teeth are carried by the shaft which drives the chuck.
  • a spring is provided which biases the chuck and the rotational hammer teeth forwardly relative to the tool during hammering while another spring biasses the stationary teeth toward the tool. in the hammer position, operator bias overcomes the spring force to engage the teeth and relative rotation causes hammering. In shiftagainst the tool by the operator during drilling and eliminates the need for an independent thrust bearing.
  • the present invention is directed to an improved power tool and specifically relates to an improved power drill which is capable of performing both drilling and hammer-drilling.
  • a further object of this invention is the provision of an inexpensive drillzhammer-dril] device.
  • Another object of this invention is the provision of an improved hammer-drill mechanism whichpermits increased impacting force at the output.
  • a further object of this invention is the provision of an improved drilling thrust takeup in a drill:hammerdrill construction.
  • a drillzhamm er-drill arrangement for a portable power tool wherein the hammering teeth are located immediately adjacent the chuck portion of the tool and wherein one set of hammering teeth are carried by the shaft which drives the chuck.
  • a spring is provided which biases the chuck and the rotational hammer .teeth forwardly relative to the tool during hammering while another spring biasses the stationary teeth toward the tool. In the hammer position, operator bias overcomes the spring force to engage the teeth and relative rotation causes hammering.
  • FIG. I is a side elevation view of a power tool embodying the present invention.
  • FIG. 2 is a detailed view partially in cross section of the tool of FIG. I in a first operative position
  • FIG. 3 is a view similar to that: of FIG. 2 but showing the tool in a second operative position.
  • a power tool 10 which includes a housing 11 covering, for example, an electric motor and a handle portion 12 which includes a cord set 13 for application of electric power to the motor and a trigger switch 14 for switching the tool on and off.
  • a gear case 15 is provided at the front end of the motor for converting the rotation of the electric motor to an appropriate speed to drive the chuck l6 and an output tool such as drill bit 17.
  • the chuck is attached to the main bodyof thetool by an attachment coupling assembly such as that described in my copending application Ser. No. 150,344, filed June 7, 1971 which is assigned to the assignee of this invention.
  • the attachment is engaged with the tool by inserting a bayonet member 18 on the attachment into a corresponding coupling member 19 on the tool.
  • FIGS. 2 and 3 This mechanism is referred to hereinafter as an attachment, although it may be used either in the form of an attachment or in the form of a permanently mounted part of a tool.
  • the drillzhammer-drill attachment 20 is illustrated in a first position wherein it is adapted for drilling only. In the context of the attachment coupling referred. toabove, this position may be defined by providing a step 21 in the bayonet teeth 22 which are inserted into the coupling member 19.
  • the step 21 engages with corresponding lugs 23 on the coupling member and a lock button 24, carried by the coupling member 19, engages with a slot in the attachment, as is more completely described in my aforementioned application.
  • the teeth 22 are carried on a coupling member 25 which is engaged with a carrier 26 of one set of hammer teeth 27 via spring 28.
  • the coupling member 25 extends radially inward to retain the carrier 29 of the other set of hammer teeth 30.
  • a stationary gripping ring 31 is also engaged with the coupling member 25 so that the operator can grasp it to insert and rotate the teeth 22.
  • the concept of spring biasing the attachment to the power unit is described. It is noted that the spring 28 represents an alternative embodiment of this biasing. Specifically, when the teeth 22 or step portions 2l engage with the lugs 23 on coupling member 19, the coupling member 25 is drawn toward the tool. Since this member is coupled to the attachment via spring .28, the spring force is exerted to draw the tool and the attachment into tighter engagement, in the manner described and claimed in that application.
  • the stationary part of the attachment includes gripping ring 31, coupling member 25 and carrier 26. These parts are engaged with the stationary outer members of the tool.
  • the rotational portion of the attachment includes chuck 16 which is threaded on to a shaft 35. In turn, the shaft 35 is adapted to be engaged with the output shaft 36 extending from gear case 15.
  • the output shaft may include a cylindrical portion 37 for piloting the chuck and a hexagonal por- 5 tion 38 for providing a positive drive coupling.
  • the stationary and rotational parts of the tool are coupled via bearing 39 and, due to the improved piloting provided in this arrangement, as described in my aforementioned application, no further bearing surface is required in the attachment portion.
  • the carrier 29 is press fitted on to the shaft 35 and rests against a shoulder 40 formed on the shaft.
  • this carrier and the hammer teeth 30 thereon are carried by and move with the shaft 35.
  • the drilling mode of operation is provided by moving the entire attachment assembly inwardly into the coupling member 19 until the leading end 41 of shaft 35 engages with inner race 42 of bearing 39.
  • the step 21 in the coupling teeth 22 is axially positionedso that engagement thereof with the lugs 23 necessarily draws the shaft 35 into engagement with the bearing 39.
  • operator thrust on the tool is absorbed by the bearing 39.
  • one set of teeth, 27, is stationary while the other set, 30, rotates with the chuck.
  • the leading edges of the sets of teeth are cammed so that, as the chuckand set 30 rotate, the main body of the tool is lifted a distance corresponding to the axial depth of the two sets of teeth.
  • Spring 43 is placed within the chuck to bias the chuck forwardly while spring 28 biases the stationary part into piloting engagement with the tool.
  • FIG. 3 illustrates the tool of this invention in a position where hammering can occur.
  • the teeth 22 have been rotated so that the step 21 has passed out of engagement with the lugs 23.
  • the force of spring 43 moves the entire attachment forwardly with respect to the rest of the drill.
  • shaft 35 moves away from bearing 39 and the hammer teeth set 30 is now free to move, either outwardly under the influence of spring 43 or inwardly when the operator overcomes this bias by pressing the tool against the work.
  • the hammer teeth 27 must also move outwardly so that they can be engaged by hammer teeth 30 in the position of FIG.
  • Another advantage of this construction is that of taking up the thrust in the drilling mode on a bearing which is required for rotational-to-stationary coupling, thus eliminating the need for an independent thrust-take up member which would add to the cost and complexity of the unit.
  • An attachment for use with a power unit including a housing, a motor contained within said housing, an output shaft extending from said motor and supported in a bearing, said bearing being mounted in said housing, said attachment being adapted for alternative- 1y performing drilling and hammer-drilling, said attachment comprising a plurality of stepped teeth arranged for engagement with said housing; a drive member for driving engagement with said output shaft; a first set of rotary hammer teeth engaged with said drive member; a second set of stationary hammer teeth coupled to said stepped teeth; means for biasing said attachment away from said output shaft; one surface of said stepped teeth being effective, upon engagement with said housing, to overcome said biasing means to position said attachment in a first position close to said tool, said drive member engaging a portion of said bearing in said first position to prevent engagement of said rotary and said stationary hammer teeth; and a second surface on said stepped teeth effective, upon engagement with said housing, to permit movement of said attachment away from said tool to a second posi-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)
US00150339A 1971-06-07 1971-06-07 Drill hammer-drill mechanism for power tool Expired - Lifetime US3730281A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15033971A 1971-06-07 1971-06-07

Publications (1)

Publication Number Publication Date
US3730281A true US3730281A (en) 1973-05-01

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ID=22534096

Family Applications (1)

Application Number Title Priority Date Filing Date
US00150339A Expired - Lifetime US3730281A (en) 1971-06-07 1971-06-07 Drill hammer-drill mechanism for power tool

Country Status (3)

Country Link
US (1) US3730281A (de)
DE (1) DE2226792A1 (de)
IT (1) IT956106B (de)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229981A (en) * 1978-09-18 1980-10-28 Milwaukee Electric Tool Corporation Reversible hammer drill
US4585077A (en) * 1982-11-10 1986-04-29 Black & Decker Overseas Ag Drilling mechanism optionally usable as a rotary drill or a hammer drill
US5449043A (en) * 1993-03-05 1995-09-12 Black & Decker Inc. Chuck spindle device and power tools incorporating same
US5458206A (en) * 1993-03-05 1995-10-17 Black & Decker Inc. Power tool and mechanism
US6003618A (en) * 1997-07-29 1999-12-21 Chicago Pneumatic Tool Company Twin lobe impact mechanism
US6401837B1 (en) * 1999-09-01 2002-06-11 Shanghai Xing Te Hao Industrial Co., Ltd. Charging type multipurpose combination tool
US6405807B1 (en) * 1999-09-01 2002-06-18 Shanghai Xing Te Hao Industrial Co., Ltd. Alternating direct current multipurpose combination tool
US6688406B1 (en) 2003-01-29 2004-02-10 Mobiletron Electronics Co., Ltd. Power tool having a function control mechanism for controlling operation in one of rotary drive and hammering modes
US6691796B1 (en) 2003-02-24 2004-02-17 Mobiletron Electronics Co., Ltd. Power tool having an operating knob for controlling operation in one of rotary drive and hammering modes
US20060231277A1 (en) * 2005-04-19 2006-10-19 Daniel Puzio Outer bearing retention structures for ratchet hammer mechanism
US20060283612A1 (en) * 2005-06-15 2006-12-21 Pillers Lauritz P Ii Tool assembly having a two part body
US20060283613A1 (en) * 2005-06-15 2006-12-21 Caterpillar Inc. Tool retention apparatus and method
US20160023346A1 (en) * 2014-07-23 2016-01-28 Black & Decker Inc. Range of Power Tools
US20180339383A1 (en) * 2017-05-29 2018-11-29 Hyundai Motor Company Spindle apparatus and operating method thereof
US10576593B2 (en) * 2014-05-30 2020-03-03 Black & Decker Inc. Power tool accessory attachment system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119274A (en) * 1961-06-05 1964-01-28 Black & Decker Mfg Co Power-driven tool for drilling or impact-drilling
US3433082A (en) * 1967-09-20 1969-03-18 Black & Decker Mfg Co Transmission and selector mechanism for alternate hammer and hammerdrill power tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3119274A (en) * 1961-06-05 1964-01-28 Black & Decker Mfg Co Power-driven tool for drilling or impact-drilling
US3433082A (en) * 1967-09-20 1969-03-18 Black & Decker Mfg Co Transmission and selector mechanism for alternate hammer and hammerdrill power tool

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4229981A (en) * 1978-09-18 1980-10-28 Milwaukee Electric Tool Corporation Reversible hammer drill
US4585077A (en) * 1982-11-10 1986-04-29 Black & Decker Overseas Ag Drilling mechanism optionally usable as a rotary drill or a hammer drill
US5449043A (en) * 1993-03-05 1995-09-12 Black & Decker Inc. Chuck spindle device and power tools incorporating same
US5458206A (en) * 1993-03-05 1995-10-17 Black & Decker Inc. Power tool and mechanism
US5704433A (en) * 1993-03-05 1998-01-06 Black & Decker Inc. Power tool and mechanism
USRE37905E1 (en) * 1993-03-05 2002-11-19 Black & Decker Inc. Power tool and mechanism
US6003618A (en) * 1997-07-29 1999-12-21 Chicago Pneumatic Tool Company Twin lobe impact mechanism
US6047779A (en) * 1997-07-29 2000-04-11 Chicago Pneumatic Tool Company Twin lobe impact mechanism
US6401837B1 (en) * 1999-09-01 2002-06-11 Shanghai Xing Te Hao Industrial Co., Ltd. Charging type multipurpose combination tool
US6405807B1 (en) * 1999-09-01 2002-06-18 Shanghai Xing Te Hao Industrial Co., Ltd. Alternating direct current multipurpose combination tool
US6688406B1 (en) 2003-01-29 2004-02-10 Mobiletron Electronics Co., Ltd. Power tool having a function control mechanism for controlling operation in one of rotary drive and hammering modes
US6691796B1 (en) 2003-02-24 2004-02-17 Mobiletron Electronics Co., Ltd. Power tool having an operating knob for controlling operation in one of rotary drive and hammering modes
US20060231277A1 (en) * 2005-04-19 2006-10-19 Daniel Puzio Outer bearing retention structures for ratchet hammer mechanism
US7588095B2 (en) * 2005-04-19 2009-09-15 Black & Decker Inc. Outer bearing retention structures for ratchet hammer mechanism
US7832495B2 (en) 2005-06-15 2010-11-16 Caterpillar Inc Tool retention apparatus and method
US7438139B2 (en) * 2005-06-15 2008-10-21 Caterpillar Inc. Tool retention apparatus and method
US20090071669A1 (en) * 2005-06-15 2009-03-19 Caterpillar Inc. Tool retention apparatus and method
US20060283613A1 (en) * 2005-06-15 2006-12-21 Caterpillar Inc. Tool retention apparatus and method
US20090229844A1 (en) * 2005-06-15 2009-09-17 Caterpillar Inc. Hammer Having a Two Part Body
US20060283612A1 (en) * 2005-06-15 2006-12-21 Pillers Lauritz P Ii Tool assembly having a two part body
US8141655B2 (en) 2005-06-15 2012-03-27 Caterpillar Inc. Hammer having a two part body
US10576593B2 (en) * 2014-05-30 2020-03-03 Black & Decker Inc. Power tool accessory attachment system
US20160023346A1 (en) * 2014-07-23 2016-01-28 Black & Decker Inc. Range of Power Tools
US10807226B2 (en) * 2014-07-23 2020-10-20 Black & Decker Inc. Range of power tools
US20180339383A1 (en) * 2017-05-29 2018-11-29 Hyundai Motor Company Spindle apparatus and operating method thereof
US10625384B2 (en) * 2017-05-29 2020-04-21 Hyundai Motor Company Spindle apparatus and operating method thereof

Also Published As

Publication number Publication date
DE2226792A1 (de) 1972-12-28
IT956106B (it) 1973-10-10

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