CA2556217A1 - Hammer drill - Google Patents
Hammer drill Download PDFInfo
- Publication number
- CA2556217A1 CA2556217A1 CA 2556217 CA2556217A CA2556217A1 CA 2556217 A1 CA2556217 A1 CA 2556217A1 CA 2556217 CA2556217 CA 2556217 CA 2556217 A CA2556217 A CA 2556217A CA 2556217 A1 CA2556217 A1 CA 2556217A1
- Authority
- CA
- Canada
- Prior art keywords
- impact
- drive shaft
- hammer drill
- drill
- actuator mechanism
- 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.)
- Abandoned
Links
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
- B25D11/104—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 with rollers or balls as cam surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/02—Chucks
- B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
- B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
- B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
-
- 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
-
- 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
- B25D2216/0038—Tools having a rotation-only mode
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Abstract
A hammer drill comprises a casing, and an electric motor mounted within the casing. A drive shaft is connected in driven relation to the electric motor, and defines a longitudinal axis.
A drill hit chuck is mounted in driven relation to the drive shaft.
An impact member having at least one impact portion is mounted in fixed relation on the drive shaft for rotation therewith. An actuator mechanism has at least one roller member rotationally mounted thereon. The actuator mechanism is mounted in freely rotatable relation on the drive shaft for longitudinal sliding movement along the drive shaft between an operatively engaged position whereat the at least one roller member engages the impact surface of the impact member as the drive shaft rotates with respect to the actuator mechanism, so as to thereby impart reciprocating motion along the longitudinal axis to the drive shaft and the drill bit chuck, and a disengaged position whereat the at least one roller member is removed from the engagement with the impact surface of the impact member.
A drill hit chuck is mounted in driven relation to the drive shaft.
An impact member having at least one impact portion is mounted in fixed relation on the drive shaft for rotation therewith. An actuator mechanism has at least one roller member rotationally mounted thereon. The actuator mechanism is mounted in freely rotatable relation on the drive shaft for longitudinal sliding movement along the drive shaft between an operatively engaged position whereat the at least one roller member engages the impact surface of the impact member as the drive shaft rotates with respect to the actuator mechanism, so as to thereby impart reciprocating motion along the longitudinal axis to the drive shaft and the drill bit chuck, and a disengaged position whereat the at least one roller member is removed from the engagement with the impact surface of the impact member.
Description
FIELD OF TFIE INVENTION
[0001] The present inventiUn xelates to hamtuer drills, and more particttlarly to hammer drills that produce a hammerincr effect efficiently.
BACKGROUND OF THE INVENTION
[0001] The present inventiUn xelates to hamtuer drills, and more particttlarly to hammer drills that produce a hammerincr effect efficiently.
BACKGROUND OF THE INVENTION
[0002] Hamm.er drills are well known and are typical i y used, even by home craftsmen, to drill ho1e,, in relatively hard subsl.an.ces, such as concreLe and the like. Such hammer drills typically have a rotating spindle that drives the drill chuck. A fi.xed disc having a.rearward'ly facing toottied surfacc is secured to the rotations spindle. A movable disc having a forwardly tacing toothed surface is selectively engageabie with the rearwardly facing toothed surf'ace of the fixed disc so as tc provide the hammer drill function. Alt2iough the apparatus does work, iL
presents a serious drawback in that the impact created by the ongagement of the two toothed surfaces is directed forwa.r.cily thrcLigh the drill bit and also back through the driJ.l itself, as a reaction force. Accordingly, the bearings of the drill tPnd to weer excessively, which :i.s highly undesirahle.
presents a serious drawback in that the impact created by the ongagement of the two toothed surfaces is directed forwa.r.cily thrcLigh the drill bit and also back through the driJ.l itself, as a reaction force. Accordingly, the bearings of the drill tPnd to weer excessively, which :i.s highly undesirahle.
[0003] Such hammer drills, also known as percussion drills, can be found in for example United States Patent 2, 9,12, 852, issued June 28, 1960 to Muthman and United States Patent 5,653,294, issued Atigust 5, 1997 to Thurier.
[0009] It is yet a further object of the present invention to provide a haznmer drill that is inexpensive to manufacture.
[0005] It i.s yet a furthcr object of Lhe present i.,nvenl:ion to p.roviae a hammer drill that is robust..
[00061 lt is yct a further object ot the present i.nvention to provide a hammer drill wherein the .f.requency and amplitude of impacts can be ad j usted or selected.
[0007] It is yet a further object of the present invention to provide a hammer drill wherein heat bu~.1d up is minimized.
[0008] It is yet a further object of the presetit znvcntion to provide a tiammer drill that can be operated at lower rotational speeds t_han prior art hammer dri l.1 s.
SUMMP,F2Y OF THE INVENTION
[0009] In accordance with one aspect of the present invention there is disclosed a novel hammer drill comprising a casing, and an electric motor mounted within the casing. A drive shaft is connected i_n driven relatioia to Lhe electric motor, and defines a longitudinal axis. A drill bit chuck is mounted in, driven relation to the drive shaft. An. impact mem.bPr having at least one impact portion is mountec3 in fixcd relation on the drive shaft for rotation therewith. An actuator mec.hanism has at least one roller member rotational.l.y mounted thereon. The acti?ator mechanism is lnounted in freely rotatable relation on the drive shaft for longitudinal slid.ing movement along the drive shaft between arr operatively engaged position whereat the at least one roller member engages the at least one impact portion of the impact membe.r, as the drivP shafL rotates with respect to the actuator mechanisni, so as to therebyimpart reciprc7cat.ing motion along thp longittidinal axis to the drive shaft and the dri11 bit cPluck, and a disengaged position whereat the at least one roller member is removed fr.om the engagemen.t with the at ].east one impart portion of the impact member.
[00010] Other advantages, features and charac.teristics of the present invention, as well as methods of operation and furicLions of the reidted elements of the structure, and the combination or parts and economies of maiiuf-acture, will become inore apparent upon consideretion of the following dPtai.led description and the appended claims with rcferenr.e to the accompanying drawings, Lhe latter of which is briefly described herein below.
HRZEF DESCRIPTION OF THE DRAWINGS
[00011] Ttie novel features which are believed to he characteristic of the hammer drill according to Lhe taresent invcntion, a:, to iLs atructure, organi.zatiuri, use cLnd method of operation, Logether wi.t.h further objectives and advantages t:hcreof, will be better understood from the following drawings in which a presently preferred embodiment of the irivention wil'_ now be ill~istrated by way of example. It is expressly understood, however, that the drawings are for the purpose of illus~ratian and description only, and are not intended as a detiniti,on of the limits of the invention. In Che accompanying drawinqs:
[00012] Figure 1 is a perspective view from the front of the first preferred embodiment of t;he hammer drill according to the present invention;
[0009] It is yet a further object of the present invention to provide a haznmer drill that is inexpensive to manufacture.
[0005] It i.s yet a furthcr object of Lhe present i.,nvenl:ion to p.roviae a hammer drill that is robust..
[00061 lt is yct a further object ot the present i.nvention to provide a hammer drill wherein the .f.requency and amplitude of impacts can be ad j usted or selected.
[0007] It is yet a further object of the present invention to provide a hammer drill wherein heat bu~.1d up is minimized.
[0008] It is yet a further object of the presetit znvcntion to provide a tiammer drill that can be operated at lower rotational speeds t_han prior art hammer dri l.1 s.
SUMMP,F2Y OF THE INVENTION
[0009] In accordance with one aspect of the present invention there is disclosed a novel hammer drill comprising a casing, and an electric motor mounted within the casing. A drive shaft is connected i_n driven relatioia to Lhe electric motor, and defines a longitudinal axis. A drill bit chuck is mounted in, driven relation to the drive shaft. An. impact mem.bPr having at least one impact portion is mountec3 in fixcd relation on the drive shaft for rotation therewith. An actuator mec.hanism has at least one roller member rotational.l.y mounted thereon. The acti?ator mechanism is lnounted in freely rotatable relation on the drive shaft for longitudinal slid.ing movement along the drive shaft between arr operatively engaged position whereat the at least one roller member engages the at least one impact portion of the impact membe.r, as the drivP shafL rotates with respect to the actuator mechanisni, so as to therebyimpart reciprc7cat.ing motion along thp longittidinal axis to the drive shaft and the dri11 bit cPluck, and a disengaged position whereat the at least one roller member is removed fr.om the engagemen.t with the at ].east one impart portion of the impact member.
[00010] Other advantages, features and charac.teristics of the present invention, as well as methods of operation and furicLions of the reidted elements of the structure, and the combination or parts and economies of maiiuf-acture, will become inore apparent upon consideretion of the following dPtai.led description and the appended claims with rcferenr.e to the accompanying drawings, Lhe latter of which is briefly described herein below.
HRZEF DESCRIPTION OF THE DRAWINGS
[00011] Ttie novel features which are believed to he characteristic of the hammer drill according to Lhe taresent invcntion, a:, to iLs atructure, organi.zatiuri, use cLnd method of operation, Logether wi.t.h further objectives and advantages t:hcreof, will be better understood from the following drawings in which a presently preferred embodiment of the irivention wil'_ now be ill~istrated by way of example. It is expressly understood, however, that the drawings are for the purpose of illus~ratian and description only, and are not intended as a detiniti,on of the limits of the invention. In Che accompanying drawinqs:
[00012] Figure 1 is a perspective view from the front of the first preferred embodiment of t;he hammer drill according to the present invention;
[0O0131 Figure 2 is a perspectivc view froni the rear of the first preferred embodiment of the hammer dxill of Figure 1;
[00014] Figure 3 i;, a side elcvltional view of the first preferred embodiment hanuner d.ri.ll of Fiqure 1, with the drill c:htick not shown for the sake of c;larity, and with the actuat'or mechariism in a fully forward position;
[40015] Figure 4 is a side elevational view similar to Fi.gure 3, but with the actuator inechanism in a disengaged position;
[00016] Figure 5 is a perspective view from the rear of the second preferred emhodi.ment of the hammer drill according to the present invention;
[000171 Figure 6 is a perspective view from the rear of th.e third preferred embodiment ortthe hammer drill according to the present~~
Invcntion;
[00018] Figure 7 i3 a perspective view fr,om the front of, the"
fourth preferred embodiment of the hammer drill according to the present invention;
_ ~ _ [00019] Figure 8 is a perspective view from the rear of the rear of the fourth preferred embodiment hammer drill of Figure 7;
[00020] Figure 9 is a side elevational view of the fourth preferred embodiment hanuner drill of the Figure 7, with the actuator mechani.sm in an erigaged position; and, [00021] Figure 10 is a side elevatzonal view of the fourth preferred embodiment hammer drill of Figurc 7, with the actuator mechanism in a disengaged positipn.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
f000221 Referring to Figures 1 through 10 of the drawings, it will be noted Lhat Figures 1 through 4 illusL-ratP a first preferred embodiment of the hanuaer drill of the present invention, Figure '~
illustrates a second preferred embodiment of the hammer cirill of the present invention, Fiqure 6 illustrates a third preferred embodiment of the hammcr drill of the present invention, and Fi,gures 7 Lhrougb 10 iliustrate a fourth preferred embodiment of Lhe present invention.
[00023] ReFerence will now be made to Figures 1 ~hrough 4 which s1-iow a first preterred embodiment of the hammer drill of the present invention, as indi.cated by gencral referenc;e numeral 120.
The hammer drill 120 comprises a casing 128 made from a suitable plastic: material, or any other suitable material. An electric motor 120 is mounted w_thi.n the casing 128 and is electrically powered in a convEntioiial manner for drills, as is well known in the related art. A drive shaft 130 defines a longitudinal axis "L"
about which it rotates, and is connected in driven relation to the Plec:t.ric motor 127.
[00024] A drill hit chuck 135 is mounted on the drive shaft 130 for rotation therewith. The drill bit chuck 135 c:omprises three movable jaw members 136 that receive and retain a conventional drill bit 129 therein.
[00025] An impact member 140 is mounted~in fixed relation on the di-ive shaft 130 for longitudinal and rotational movement therewith.
In the first preferred embodiment, as illustrated, the impact member 140 has a rearward facing impact surface 146 that is inteqrally formed on the main body portion 142. Alternatively, Lhe rearward facinq impact surface 146 may be formed on a rearward ring member (not specifically shown).
[00026] The impact member. 140 has at least one impact portion 148 at the impact rearward facing impact surface 146. The at least one impact portion comprises a plurality of impact portioris 148, and as can readily bE seeii ir3 the figures, the plurality of impact:
portions 148 includes a plurality of. protrusions. Alt_ernatively, iL is contemplated that the pluralit,y of impact portions could include a pluraliLy of indentations. In ttie fi.rst preferred embodiment, as illustrated, there are twenty-four impact portions 1.48, that can also be considered to be in the form of radially directed teeth. The twerity-four impact portions 148 are su.bstantially evenly spaced around the rearwardly facirig impact surL'ace 146. Alternatively, Lhere can be any suitable number of impact portions. Rs can readily be seen in the Figures, the impact portions 148 form a shaped impact surface 146.
~ '.
[00027] FurLher, the impact portiori5 can be formed as parl_ of the impact member 140 without there actually being aN impact surface.
Also alternat.ively, Lhe rollcr members 160 may be irregularly spaced, or apaced apart in any other suitable manner.
[00028] An actuator mec:hani.sm 150 comprises a main body member 152, The actuator mechanism 150 is moirnted in freely rotatable relation on the drive shaft 130 rearwardly of the impact member 140, for longitudirial sliding movemeTit aloriq the drive shaft 130 between a forward operatively engaged position, as is best: seen ii:
> igure 3, aild a rearward disengaged posii_ion, as is best seen in k'igure 4. In the first preferred einbodiment, tYhe actuator mechani,sm 150 is retainecl on Lhe drive shaft 130 by means of a"C"-clip 161 securely engaged in an annular slot 162 in the drive sliatt 130. The "C"-clip 761 defines the rearward disengaged position of the actuator collar. othe,r suitable means may also be used.
[00029] The actuator mechanism 150 has at least one roller ietember, and in the fi.rsL preferred embodiment as illustrated, three roller menLbers 160, are rotat:.ional].y mounLed on the main body member 152 of the ar.tuator mechanism 150 by means of mounti.n.g pins 161 press fit into cooperating apertures 153 in the main body member 152. The axis of rotation "R" of each roller member 160 is substantially perpenciicular to the longitudinal axis "L" of the i drive stlaft 150. The roller members 160, as i.l.lustraLed, arc bearing assemblies having an outer ring freely rotatably mUunteci onto an inner hub. other suitable designs of roller members 160 could also be used.
[00030] A manually manipulable handle 170 is removably corizzec:Led to the actiiator mechanism 1,50 by means of a threaded shaft 172 threadibly enclaged in a co-operating threaded bore hole 151. The hand.le 1'70 permits manual ntanipulation of the actuator mec:hanism 150 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 150 betweeii the forward operatively engaged position and the rearward disengaged position.
The gap between the roller members 160 and the impact portion5 148 as occurs in, the rearward disengaged position, is indicated by arrow "G" in. Figure 4. The manually manipulable handlc 170 is preferably Inade from a suitable plastic material in order to insulate an operator's }iand from potential electric shock i.f tkle drill bit 129 happens to contact a live electrical wirc- during drilling.
[00031] Tn the operatively engaged position the ro],lcr members 160 engage the impact portions 148 of the impact member 140 as the drive shaft 130 rotates with respect to the actuator mechanism 150, as would oCcur during normal tise of an eloctric drill (not shown) In this manner, the roller members 160 impart reciprocating motion alonq the long.i.tudinal axis "L" to the drive shaft 130. It would be readily understood by one skilled in the art that the roller members 160 generally ride along the rearward facing impact surface 146, and may impact all of the rearward facing impact surface 1.46, or impacts only higher portions of the rearward facing iinpact surface 146, deppnding on the speed of rotation of the impact metti}aer 140 with respecL with the actuator mechanism 150.
- 3.0 -[00032] The height, radius ot curvature, shape and number of teetti 148 will affect ttie f.r.equency and amplitude of the impacts of the roller members 150 on the rearward facing impact surface 146.
[000331 As described above, the conventional drill bit 129 is caused to "hammer" into a piece of material as it rotates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or concrete. It should also be noted that the electric drill itself does not absorb the reactiotz of the impac;L of, the roller members 160 on the teeth 1.48 of the rearwardly facing toothed surface 146.
[00034] ln Lhe disengaged posiLion, the roller members 160 are removed from engagement with the rearward facing impact surface 146. In this man.ner, an electric drill havirlg the hammer drill 120 U
of the present invention mounted thereon, would be used as a r ~.
conventional drill..
[000351 Reference will now be made to FigurP 5, which shows a second preferred embodiment of the hammer dri].1, of the present invention, a5 indicated by general ret'erence numeral 220. 'Zhe hammer drill 220 is similar to the first prPfe.rr. ed embodiment hammer dril.l 120 except that tbti at least one i.itipact portion comprises a p.lurality of impact parLs 248 secured to said impact member 240. More specifically, the impact parts 248 each comprise a 5ma.l.l roller bearing rotatably mounteti on, the impact member 240.
As can be readily seen, in this embodi.ment, there is not aii overall impact surface on the impact member 240.
[00036) Reference will now be made to Figure 6, which show,, a third preferred embodiment of the hammer drzll of the present invention, as indicated by general reference numeral 320. The hammer drill 320 is similar to the first preferred embodimenl.
hanuner drill 120 except that the plurality of impact portions 348 includes a plurality of indentation,, [000371 In an alternative embodiment of the present invention (not illustrated), i.t is contemplated that a spring coilld bias the actuator mech.anism 150 to its disengaged position. Accordingly, t ~.
the actuator mechanism 150 does not rotate, or at l.east not isubstantially so, when the drive shaft 13.Q is rotated during use.
This is ad.vanl.ageous in that wheri the actuator mechanism 150 is grasped by an operator for use, it is not rotating, and is therefore more readily grasped.
[00038] Reference will now be made to I'igtires / throuqh 10, which shows a fourth prefe.rred embodimetlt of the hamme.r drill bit chiick attachment of the present invention, as inciicated by qeneral reference numeral 420. The fourth preferred embodimernt of the hammer drill bit chuck attachment 420 is simila.r, to the third preferred embodiment of the hamm.er drill bit chuck attachment 320, except that the at least one impact portiozi 448 at the impact rearward facing impact, surface 446 of the impact member 440 comprises a plurality of ball bearings 448 mourited with.in a co-operating cylindrical rece;;s 449 in the itupact member 440, and the at least one roller member comprises a plurality of ball bearirigs 458 mounted within a co-operati.ng cylindrical recess 459 in the actuator mechanism 450.
[00039] The bail bearings 448,458 are each mounted w'.thin a co-operating cylindrical recess 449,459 having a diameter slightly greater than the diameter of the ball, beariiZqs 448, 458, and a depth slightly less than the diameter of the ball bearings 448,458, so that the ba]..l bearings 448,458 project oijtwardly from the cooperating recesses 449,459 respectfully. Prefprably; the ball bearings 448,458 are each mounted within the co-operating recesses 449,459 by means of a suitable grease type ms.teriai, so as to help retain the ball bearings 448,458 in place.
[00040] It has bHerl found that ball bearings 448,458 having a diameter of abou't 5/16" are suitable, although othor sizes of ball bearings 448,458 could also be used. It has also been found that the ball bearings 44I3, 458 of about this size should prot'rude beyond the rearwardly facing surface 446 of the impac.t member 140 and the forwardly facing surface 456 of the actuator niechanism 450, as the case may be, by up to about 0.050", or eveiz more, and preferably by about 0-02J", depending on the diameter of the ba-1.1 bearings 448,458. Although the ball bearings 448 and the ball bearings 458 are shown to be the same diameter as each other, this is not absolutely necessaxy.
[00041] Il:_ has been round that with the hammer drill of the prescnt invention, there is reduced fric.tion, reduced heat build up, reduced wear and improved drilling performance compared wiLh conventional hammer drills, which have two sets of impacting steel teetYi used to perform the hammering fzincti.on. Heat build up is of particular concern under International Elecl_rotechnical Commission ~. t IEC 60745 1t2001 (Hand Held Motor-Operated Electric Tnnl.s -Safety), and 60745 11,2001 (2003-01) (IIand Held Moto.r_-CVjeraLed Electric Tools - Safety - particular requirements for drills and impact drills), as adopted by UL, GSA and other national governing bodies regulatinq safety in band held power tools and accessUries.
Ari electric drill using the present invcntion experiences very minimal lass of speed due to the reduced friction between the roller members and the impact member. Accordingly, the rotational energy is directed to the actual longitudinal vibration, and not to losses due tc) friction and heat. This is importatrL for being able to achieve the maximum possible rotational speed with a drill, and al;;o for reduced wear of the hammer dr.i.l.l of the present irivention and ari electric dr.i.ll being used. In cantrast, an electric hammer drill actually operate.; at a signi ficantly redtzced. rotational speed compared to the maximijm rotational speed of the conventional drill wiLhout a load or hammer engagement, due to the friction of the steel teeth.
[00042) As can be under-stood from the above description and from the accompanying drawings, the present invention provides a hanutier drill that is inexpensive to manufacture, that is robtzst, wher..ein the frequency and amp],itude of impacts can be adjusted or se] ected, whex=ein heat build up is minimized, and wherein an electric drill used in conjui-iction witli, the hammer dri.11 can be operated at lower iE
rotaLional speeds, all of which features are unknown in the prior art.
[000431 Other variations of the above principles will be apparent to those who are knowledgeablc in the iield of the invention, and suc11 variations are considered to be within the scope of the prescnt inventiori. Further, other modificat~ons and alterations may be used in the design and manufacture of the hammer drill bit and hammer drill of Ltie present invention without deparl.ing from the spirit and se.ope of the accompanying c.:laims.
F = '
[00014] Figure 3 i;, a side elcvltional view of the first preferred embodiment hanuner d.ri.ll of Fiqure 1, with the drill c:htick not shown for the sake of c;larity, and with the actuat'or mechariism in a fully forward position;
[40015] Figure 4 is a side elevational view similar to Fi.gure 3, but with the actuator inechanism in a disengaged position;
[00016] Figure 5 is a perspective view from the rear of the second preferred emhodi.ment of the hammer drill according to the present invention;
[000171 Figure 6 is a perspective view from the rear of th.e third preferred embodiment ortthe hammer drill according to the present~~
Invcntion;
[00018] Figure 7 i3 a perspective view fr,om the front of, the"
fourth preferred embodiment of the hammer drill according to the present invention;
_ ~ _ [00019] Figure 8 is a perspective view from the rear of the rear of the fourth preferred embodiment hammer drill of Figure 7;
[00020] Figure 9 is a side elevational view of the fourth preferred embodiment hanuner drill of the Figure 7, with the actuator mechani.sm in an erigaged position; and, [00021] Figure 10 is a side elevatzonal view of the fourth preferred embodiment hammer drill of Figurc 7, with the actuator mechanism in a disengaged positipn.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
f000221 Referring to Figures 1 through 10 of the drawings, it will be noted Lhat Figures 1 through 4 illusL-ratP a first preferred embodiment of the hanuaer drill of the present invention, Figure '~
illustrates a second preferred embodiment of the hammer cirill of the present invention, Fiqure 6 illustrates a third preferred embodiment of the hammcr drill of the present invention, and Fi,gures 7 Lhrougb 10 iliustrate a fourth preferred embodiment of Lhe present invention.
[00023] ReFerence will now be made to Figures 1 ~hrough 4 which s1-iow a first preterred embodiment of the hammer drill of the present invention, as indi.cated by gencral referenc;e numeral 120.
The hammer drill 120 comprises a casing 128 made from a suitable plastic: material, or any other suitable material. An electric motor 120 is mounted w_thi.n the casing 128 and is electrically powered in a convEntioiial manner for drills, as is well known in the related art. A drive shaft 130 defines a longitudinal axis "L"
about which it rotates, and is connected in driven relation to the Plec:t.ric motor 127.
[00024] A drill hit chuck 135 is mounted on the drive shaft 130 for rotation therewith. The drill bit chuck 135 c:omprises three movable jaw members 136 that receive and retain a conventional drill bit 129 therein.
[00025] An impact member 140 is mounted~in fixed relation on the di-ive shaft 130 for longitudinal and rotational movement therewith.
In the first preferred embodiment, as illustrated, the impact member 140 has a rearward facing impact surface 146 that is inteqrally formed on the main body portion 142. Alternatively, Lhe rearward facinq impact surface 146 may be formed on a rearward ring member (not specifically shown).
[00026] The impact member. 140 has at least one impact portion 148 at the impact rearward facing impact surface 146. The at least one impact portion comprises a plurality of impact portioris 148, and as can readily bE seeii ir3 the figures, the plurality of impact:
portions 148 includes a plurality of. protrusions. Alt_ernatively, iL is contemplated that the pluralit,y of impact portions could include a pluraliLy of indentations. In ttie fi.rst preferred embodiment, as illustrated, there are twenty-four impact portions 1.48, that can also be considered to be in the form of radially directed teeth. The twerity-four impact portions 148 are su.bstantially evenly spaced around the rearwardly facirig impact surL'ace 146. Alternatively, Lhere can be any suitable number of impact portions. Rs can readily be seen in the Figures, the impact portions 148 form a shaped impact surface 146.
~ '.
[00027] FurLher, the impact portiori5 can be formed as parl_ of the impact member 140 without there actually being aN impact surface.
Also alternat.ively, Lhe rollcr members 160 may be irregularly spaced, or apaced apart in any other suitable manner.
[00028] An actuator mec:hani.sm 150 comprises a main body member 152, The actuator mechanism 150 is moirnted in freely rotatable relation on the drive shaft 130 rearwardly of the impact member 140, for longitudirial sliding movemeTit aloriq the drive shaft 130 between a forward operatively engaged position, as is best: seen ii:
> igure 3, aild a rearward disengaged posii_ion, as is best seen in k'igure 4. In the first preferred einbodiment, tYhe actuator mechani,sm 150 is retainecl on Lhe drive shaft 130 by means of a"C"-clip 161 securely engaged in an annular slot 162 in the drive sliatt 130. The "C"-clip 761 defines the rearward disengaged position of the actuator collar. othe,r suitable means may also be used.
[00029] The actuator mechanism 150 has at least one roller ietember, and in the fi.rsL preferred embodiment as illustrated, three roller menLbers 160, are rotat:.ional].y mounLed on the main body member 152 of the ar.tuator mechanism 150 by means of mounti.n.g pins 161 press fit into cooperating apertures 153 in the main body member 152. The axis of rotation "R" of each roller member 160 is substantially perpenciicular to the longitudinal axis "L" of the i drive stlaft 150. The roller members 160, as i.l.lustraLed, arc bearing assemblies having an outer ring freely rotatably mUunteci onto an inner hub. other suitable designs of roller members 160 could also be used.
[00030] A manually manipulable handle 170 is removably corizzec:Led to the actiiator mechanism 1,50 by means of a threaded shaft 172 threadibly enclaged in a co-operating threaded bore hole 151. The hand.le 1'70 permits manual ntanipulation of the actuator mec:hanism 150 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 150 betweeii the forward operatively engaged position and the rearward disengaged position.
The gap between the roller members 160 and the impact portion5 148 as occurs in, the rearward disengaged position, is indicated by arrow "G" in. Figure 4. The manually manipulable handlc 170 is preferably Inade from a suitable plastic material in order to insulate an operator's }iand from potential electric shock i.f tkle drill bit 129 happens to contact a live electrical wirc- during drilling.
[00031] Tn the operatively engaged position the ro],lcr members 160 engage the impact portions 148 of the impact member 140 as the drive shaft 130 rotates with respect to the actuator mechanism 150, as would oCcur during normal tise of an eloctric drill (not shown) In this manner, the roller members 160 impart reciprocating motion alonq the long.i.tudinal axis "L" to the drive shaft 130. It would be readily understood by one skilled in the art that the roller members 160 generally ride along the rearward facing impact surface 146, and may impact all of the rearward facing impact surface 1.46, or impacts only higher portions of the rearward facing iinpact surface 146, deppnding on the speed of rotation of the impact metti}aer 140 with respecL with the actuator mechanism 150.
- 3.0 -[00032] The height, radius ot curvature, shape and number of teetti 148 will affect ttie f.r.equency and amplitude of the impacts of the roller members 150 on the rearward facing impact surface 146.
[000331 As described above, the conventional drill bit 129 is caused to "hammer" into a piece of material as it rotates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or concrete. It should also be noted that the electric drill itself does not absorb the reactiotz of the impac;L of, the roller members 160 on the teeth 1.48 of the rearwardly facing toothed surface 146.
[00034] ln Lhe disengaged posiLion, the roller members 160 are removed from engagement with the rearward facing impact surface 146. In this man.ner, an electric drill havirlg the hammer drill 120 U
of the present invention mounted thereon, would be used as a r ~.
conventional drill..
[000351 Reference will now be made to FigurP 5, which shows a second preferred embodiment of the hammer dri].1, of the present invention, a5 indicated by general ret'erence numeral 220. 'Zhe hammer drill 220 is similar to the first prPfe.rr. ed embodiment hammer dril.l 120 except that tbti at least one i.itipact portion comprises a p.lurality of impact parLs 248 secured to said impact member 240. More specifically, the impact parts 248 each comprise a 5ma.l.l roller bearing rotatably mounteti on, the impact member 240.
As can be readily seen, in this embodi.ment, there is not aii overall impact surface on the impact member 240.
[00036) Reference will now be made to Figure 6, which show,, a third preferred embodiment of the hammer drzll of the present invention, as indicated by general reference numeral 320. The hammer drill 320 is similar to the first preferred embodimenl.
hanuner drill 120 except that the plurality of impact portions 348 includes a plurality of indentation,, [000371 In an alternative embodiment of the present invention (not illustrated), i.t is contemplated that a spring coilld bias the actuator mech.anism 150 to its disengaged position. Accordingly, t ~.
the actuator mechanism 150 does not rotate, or at l.east not isubstantially so, when the drive shaft 13.Q is rotated during use.
This is ad.vanl.ageous in that wheri the actuator mechanism 150 is grasped by an operator for use, it is not rotating, and is therefore more readily grasped.
[00038] Reference will now be made to I'igtires / throuqh 10, which shows a fourth prefe.rred embodimetlt of the hamme.r drill bit chiick attachment of the present invention, as inciicated by qeneral reference numeral 420. The fourth preferred embodimernt of the hammer drill bit chuck attachment 420 is simila.r, to the third preferred embodiment of the hamm.er drill bit chuck attachment 320, except that the at least one impact portiozi 448 at the impact rearward facing impact, surface 446 of the impact member 440 comprises a plurality of ball bearings 448 mourited with.in a co-operating cylindrical rece;;s 449 in the itupact member 440, and the at least one roller member comprises a plurality of ball bearirigs 458 mounted within a co-operati.ng cylindrical recess 459 in the actuator mechanism 450.
[00039] The bail bearings 448,458 are each mounted w'.thin a co-operating cylindrical recess 449,459 having a diameter slightly greater than the diameter of the ball, beariiZqs 448, 458, and a depth slightly less than the diameter of the ball bearings 448,458, so that the ba]..l bearings 448,458 project oijtwardly from the cooperating recesses 449,459 respectfully. Prefprably; the ball bearings 448,458 are each mounted within the co-operating recesses 449,459 by means of a suitable grease type ms.teriai, so as to help retain the ball bearings 448,458 in place.
[00040] It has bHerl found that ball bearings 448,458 having a diameter of abou't 5/16" are suitable, although othor sizes of ball bearings 448,458 could also be used. It has also been found that the ball bearings 44I3, 458 of about this size should prot'rude beyond the rearwardly facing surface 446 of the impac.t member 140 and the forwardly facing surface 456 of the actuator niechanism 450, as the case may be, by up to about 0.050", or eveiz more, and preferably by about 0-02J", depending on the diameter of the ba-1.1 bearings 448,458. Although the ball bearings 448 and the ball bearings 458 are shown to be the same diameter as each other, this is not absolutely necessaxy.
[00041] Il:_ has been round that with the hammer drill of the prescnt invention, there is reduced fric.tion, reduced heat build up, reduced wear and improved drilling performance compared wiLh conventional hammer drills, which have two sets of impacting steel teetYi used to perform the hammering fzincti.on. Heat build up is of particular concern under International Elecl_rotechnical Commission ~. t IEC 60745 1t2001 (Hand Held Motor-Operated Electric Tnnl.s -Safety), and 60745 11,2001 (2003-01) (IIand Held Moto.r_-CVjeraLed Electric Tools - Safety - particular requirements for drills and impact drills), as adopted by UL, GSA and other national governing bodies regulatinq safety in band held power tools and accessUries.
Ari electric drill using the present invcntion experiences very minimal lass of speed due to the reduced friction between the roller members and the impact member. Accordingly, the rotational energy is directed to the actual longitudinal vibration, and not to losses due tc) friction and heat. This is importatrL for being able to achieve the maximum possible rotational speed with a drill, and al;;o for reduced wear of the hammer dr.i.l.l of the present irivention and ari electric dr.i.ll being used. In cantrast, an electric hammer drill actually operate.; at a signi ficantly redtzced. rotational speed compared to the maximijm rotational speed of the conventional drill wiLhout a load or hammer engagement, due to the friction of the steel teeth.
[00042) As can be under-stood from the above description and from the accompanying drawings, the present invention provides a hanutier drill that is inexpensive to manufacture, that is robtzst, wher..ein the frequency and amp],itude of impacts can be adjusted or se] ected, whex=ein heat build up is minimized, and wherein an electric drill used in conjui-iction witli, the hammer dri.11 can be operated at lower iE
rotaLional speeds, all of which features are unknown in the prior art.
[000431 Other variations of the above principles will be apparent to those who are knowledgeablc in the iield of the invention, and suc11 variations are considered to be within the scope of the prescnt inventiori. Further, other modificat~ons and alterations may be used in the design and manufacture of the hammer drill bit and hammer drill of Ltie present invention without deparl.ing from the spirit and se.ope of the accompanying c.:laims.
F = '
Claims (10)
- I CLAIM:
l. A hammer drill comprising:
a casing;
an electric motor mounted within said casing;
a drive shaft connected in driven relation to said electric motor, and defining a longitudinal axis;
a drill bit chuck mounted in driven relation to said drive shaft;
an impact member having at least one impact portion, and mounted in fixed relation on said drive shaft for rotation therewith; and, an actuator mechanism having at least one roller member rotationally mounted thereon, said actuator mechanism mounted in freely rotatable relation on said drive shaft for longitudinal sliding movement along said drive shaft between an operatively engaged position whereat said at least one roller member engages said at least one impact portion of said impact member as said drive shaft rotates with respect to said actuator mechanism, so as to thereby impart reciprocating motion along said longitudinal axis to said drive shaft and said drill bit chuck, and a disengaged position whereat said at least one roller member is removed from said engagement with said at least one impact portion of said impact member. - 2. The hammer drill of claim 1, wherein said at least one roller member comprises three roller members.
- 3. The hammer drill of claim 1, wherein said impact surface is rearwardly facing.
- 4. The hammer drill of claim 1, further comprising a manual manipulable handle connected to said actuator mechanism for permitting said longitudinal sliding movement of said actuator mechanism between said forward operatively engaged position and said rearward disengaged position.
- 5. The hammer drill of claim 4, wherein said handle is removably connected to said actuator mechanism.
- 6. The hammer drill of claim 1, wherein said at least one impact portion form a shaped impact surface.
- 7. The hammer drill of claim 6, wherein said at least one impact portion comprises a plurality of impact portions.
- 8. The hammer drill of claim 7, wherein said plurality of impact portions includes a plurality of protrusions.
- 9. The hammer drill of claim 6, wherein said plurality of impact portions includes a plurality of indentations.
- 10. The hammer drill of claim 1, wherein said at least one impact portion comprises a plurality of impact parts secured to said impact member.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2556217 CA2556217A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill |
| PCT/CA2007/001376 WO2008017150A2 (en) | 2006-08-08 | 2007-08-08 | Hammer drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2556217 CA2556217A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2556217A1 true CA2556217A1 (en) | 2008-02-08 |
Family
ID=39030939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2556217 Abandoned CA2556217A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2556217A1 (en) |
| WO (1) | WO2008017150A2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2223727A (en) * | 1939-04-24 | 1940-12-03 | Homen Carl | Percussion drill |
| BE572527A (en) * | 1957-11-26 | |||
| US2968960A (en) * | 1959-12-08 | 1961-01-24 | Fulop Charles | Variable impact drill |
| US4450919A (en) * | 1983-01-03 | 1984-05-29 | Cousineau Bernard L | Drill attachment |
| US5494115A (en) * | 1994-10-25 | 1996-02-27 | Hwong; Steven | Electric hammer drill |
-
2006
- 2006-08-08 CA CA 2556217 patent/CA2556217A1/en not_active Abandoned
-
2007
- 2007-08-08 WO PCT/CA2007/001376 patent/WO2008017150A2/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008017150A2 (en) | 2008-02-14 |
| WO2008017150A3 (en) | 2008-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7334647B2 (en) | Rotary tool | |
| US6196330B1 (en) | Manually operable drilling tool with dual impacting function | |
| US7591326B2 (en) | Power tool | |
| US7404451B2 (en) | Wobble device for a hand-held power tool and a hand-held power tool with the wobble device | |
| RU2009125389A (en) | PUNCHER | |
| DK1371458T3 (en) | Drill hammer with overload clutch | |
| JPS5930607A (en) | Electric hammer drill | |
| US20060102364A1 (en) | Impact mechanism for a hammer drill | |
| US3006202A (en) | Rotary and percussive tool | |
| CA2556217A1 (en) | Hammer drill | |
| US20230118960A1 (en) | Power tool | |
| GB2381228A (en) | Electrically powered hammer with support bearing | |
| JP2828657B2 (en) | Hammer drill | |
| EP3603892B1 (en) | Hammer drill | |
| CN213765703U (en) | Impact drill converter | |
| EP2085190B1 (en) | Percussion tool | |
| US20100252290A1 (en) | Adjustable amplitude hammer drill mechanism | |
| CN102649266A (en) | Multifunctional double-speed electric hammer | |
| CA2555533A1 (en) | Hammer drill bit chuck attachment | |
| CN204700847U (en) | Electric hammer percussion drill | |
| US20230390911A1 (en) | Universal Chisel Attachment | |
| CN220561461U (en) | Box lightweight electric hammer | |
| KR102579338B1 (en) | Multi Functional Power Tool | |
| KR102509965B1 (en) | Lubricant Anti-Dry Power Tools | |
| JP2595262B2 (en) | Hammer drill |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |