CA2555533A1 - Hammer drill bit chuck attachment - Google Patents
Hammer drill bit chuck attachment Download PDFInfo
- Publication number
- CA2555533A1 CA2555533A1 CA 2555533 CA2555533A CA2555533A1 CA 2555533 A1 CA2555533 A1 CA 2555533A1 CA 2555533 CA2555533 CA 2555533 CA 2555533 A CA2555533 A CA 2555533A CA 2555533 A1 CA2555533 A1 CA 2555533A1
- Authority
- CA
- Canada
- Prior art keywords
- actuator mechanism
- drill bit
- hammer drill
- main shaft
- bit chuck
- 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
- B23B31/008—Chucks; Expansion mandrels; Adaptations thereof for remote control with arrangements for transmitting torque
-
- 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
- B23B31/11—Retention by threaded connection
-
- 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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
- B23B45/003—Attachments
-
- 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
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Abstract
A hammer drill bit chuck attachment comprises a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis. An impact member is mounted in fixed relation on the main shaft for rotation therewith.
An actuator mechanism is mounted on the main shaft for free rotation of the main shaft with respect to the actuator mechanism and for longitudinal sliding movement of the actuator mechanism along the main shaft between a forwardly displaced position and a rearwardly displaced position. At least one impact portion is disposed on one of the impact member and the actuator mechanism.
At least one roller member is rotationally mounted on the other of the impact member and the actuator mechanism. Rotation of the main shaft and impact member about the longitudinal axis when the actuator mechanism is in force transmitting engagement with the impact member, causes the actuator mechanism to move in a reciprocating motion between the forwardly displaced position and the rearwardly displaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
An actuator mechanism is mounted on the main shaft for free rotation of the main shaft with respect to the actuator mechanism and for longitudinal sliding movement of the actuator mechanism along the main shaft between a forwardly displaced position and a rearwardly displaced position. At least one impact portion is disposed on one of the impact member and the actuator mechanism.
At least one roller member is rotationally mounted on the other of the impact member and the actuator mechanism. Rotation of the main shaft and impact member about the longitudinal axis when the actuator mechanism is in force transmitting engagement with the impact member, causes the actuator mechanism to move in a reciprocating motion between the forwardly displaced position and the rearwardly displaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
Description
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TITLE: IIAMMEkt Dk2ILL BIT CHUCK ATTACHMENT
INVENTOR: FERN BEA.UCHAMP
FIELD OF THE INVENTION
[0001] The present inventiori relates to hammer drills, and more particularly to hammer drill bit chuck attachments.
f3ACKGROUNA OF THE INVENTION
TITLE: IIAMMEkt Dk2ILL BIT CHUCK ATTACHMENT
INVENTOR: FERN BEA.UCHAMP
FIELD OF THE INVENTION
[0001] The present inventiori relates to hammer drills, and more particularly to hammer drill bit chuck attachments.
f3ACKGROUNA OF THE INVENTION
[0002] Fiammer drills are well known and 3re typicall y used, even by home c-r a ftcmon, tcr.. i.. .~~ ..,.~... ~,~ ~.,~....~ ,,..'!.Y . ._. , such as concrete and tho like. Such hammer drills typically have a rotating spindle that drives the drill chuck. A fixed disc having a rearwardly facing toothed. surface is secured to the rotations spindle. A, movable disc having= a forwardly facing toothed surface is selectively engageable with the rearwardly facing toothed surface of the fixed disc: so as to provide the hammer drill funct_ion. Althoiigh the apparatus does work, it presents a serious drawback in that the impact created by the engagement of the two toothed surfaces is directcd forwardly through the drill bit and aJ.so back through the drill itself, as a reaction force. Accordingly, the bearings of the drill tend to wear excessively, which is highly undesi.rablc. Further, it is well known that there can be significant heat build with prior art hammP,r, drills.
[0003] Such hammer drills, also known as percussion drills, can be found in for example United S1:ates Patent 2, 942, 852, issued June 28, 1960 to Muthmari arnd Usiited States Patent 5, 653, 294, issued August 5, 1997 to Thurler.
[0004] United States Patent 4,450,919, issued Ma.y 29, 1984 to Cousineau discloses a drill attachment for use with a conventional electric drill. This drill attachment provides a hammering and drilling action so that a conventional drill may be used to drill into hard substances. The d.r.i.ll, attachment comprises a hammer assembly having a rearward case and a forward chuck assembly. A
rotating spindle is mounted within the case and has a reciprocating spindle moui'ited irl tkie front end thereof. The rotating spindYe drives a drill chuck wzthin the chuck assembly via the reciprocating spindle. A rotating ciutch plate mounted on the reciprocating spindle rotates with the reciprocating spindle.
Teeth on the rotating clutch plato engage cooperating teeth on the stationary clutch that is securely mounted on the case. A
rcmovable handle connected to the case permits the case, and therefore the stationary clutch, to be selectively moved forwardly such that the teeth of the stationary clutch engage the teeth of the rotating clutch plate, to thereby impart the hammering function to a drill bit retained within the bit chuck. The reaction force is not transiuitted back through the drill itself, buL is transmitted to the handle, thus saving wear on the bea.r.i,ngs of the drill. However, the above described drill attachmexit; is far more complicated and rar more expensive than is necessary.
t0005] ft is a further object of the present invention to provide a simplifi.ed hammer drill bit chuck attachment.
[0006] It is yet a further object of the present iriventi.on to prov.id.e a simplified hanuner dLill biL c:liuck attacnment tnat is inexpensive to manufacture.
[0007] It is yet a further object of the present invention to provide a simplified hammer drill bit chuck attachment Lhat is robust.
[0008] It is yet a further object of the. present invention to provide a simplified hammer drill bit chuck attactunPnt wherein the frequency and ampJ.itude of impacts can be adjusted or selected_ [0009] It is yet a further object of the present invention to provide a Simplifi.ed hammer drill bit chuck attachmerit wherein heat build up is minimized.
[00010] It is yet a further object of the present invention to provide a hamnier drill bit chuck attachment wherein an electric drill used in cronjunction with the hammer drill bit chuck attaclunent can be operated at lower rotational speeds.
SGMMJARY OF THE INVENTION
[00011) In accordance with one aspect of the present invention there is disclosed a novel hammer drill bit chuc.k attachment comprising a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis. An impact member is mounted in fixed relation on the main shaft for rotation therewith. An actuator mechanism is mounted on the main shaft for free rotation of the ma.a.n shaft with respect to the actuator mechanism and for longitudinal sliding movernent of the actuator mechanism alorig the main shaft between -a forwardly displaced posiLion and a rearwardly displaced position. At least one impact portion is disposed on one of the impact member and the actuator mechanism. At least one roller member is 'rotaLionally mounted on the other of the impact member and the actuator mechanism. Rotation of the main shaft and impact member about the longitudinal axis when the actuator mechanism is in force Lransmitting engagement with the impact member, causes the actuator mechanism to move in a reciprocating motion between the forwardly displaced position and the rearwardly displaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
[00012] Other advantages, features and characteristics of the present invention, as well as methocis of operation and functions of the related elements of the structure, and the.combination of parts and economies of manufacture, will become more apparent upon consideration of the following detailed description and the appended claims with reference to the accompanying drawings, the latter of which i5 briefly described herein below.
BRIEF DESCRIPTION OF THE DRAWINGS
1000131 The novel. features which are believed to be characteristic of the hammer dril], bit and hammer drill bit chuck attachment according to the present invention, as to its structure, organization, use and method of operation, together with further objectives and advantaqes thereof, will be better understood from the following drawings in which a presentl.y preferred embodiment of the invention will now be ill.ustrated by way of example. It is expressly understood, however-, L=hat the drawings are for the purpose of illustration arid description only, and are not intended as a definition of the limits of the invention. In the ac:companying drawings:
[00014] Figure 1 is a perspective view from the front of the first preferred embodiment of the hammer drill bit uhuck attachment accordinq to the present invention;
[00015] Figure 2 is a perspective view from Lhe rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00016] Figure 3 is an exploded perspective view from the front of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00017] Figure 4 is an exploded perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00018] Figure 5 is an enlarged exploded perspective view from the front of a portion of the second preferred embodiment hammer drill bit chuck attachment of Fi.gure 1;
rotating spindle is mounted within the case and has a reciprocating spindle moui'ited irl tkie front end thereof. The rotating spindYe drives a drill chuck wzthin the chuck assembly via the reciprocating spindle. A rotating ciutch plate mounted on the reciprocating spindle rotates with the reciprocating spindle.
Teeth on the rotating clutch plato engage cooperating teeth on the stationary clutch that is securely mounted on the case. A
rcmovable handle connected to the case permits the case, and therefore the stationary clutch, to be selectively moved forwardly such that the teeth of the stationary clutch engage the teeth of the rotating clutch plate, to thereby impart the hammering function to a drill bit retained within the bit chuck. The reaction force is not transiuitted back through the drill itself, buL is transmitted to the handle, thus saving wear on the bea.r.i,ngs of the drill. However, the above described drill attachmexit; is far more complicated and rar more expensive than is necessary.
t0005] ft is a further object of the present invention to provide a simplifi.ed hammer drill bit chuck attachment.
[0006] It is yet a further object of the present iriventi.on to prov.id.e a simplified hanuner dLill biL c:liuck attacnment tnat is inexpensive to manufacture.
[0007] It is yet a further object of the present invention to provide a simplified hammer drill bit chuck attachment Lhat is robust.
[0008] It is yet a further object of the. present invention to provide a simplified hammer drill bit chuck attactunPnt wherein the frequency and ampJ.itude of impacts can be adjusted or selected_ [0009] It is yet a further object of the present invention to provide a Simplifi.ed hammer drill bit chuck attachmerit wherein heat build up is minimized.
[00010] It is yet a further object of the present invention to provide a hamnier drill bit chuck attachment wherein an electric drill used in cronjunction with the hammer drill bit chuck attaclunent can be operated at lower rotational speeds.
SGMMJARY OF THE INVENTION
[00011) In accordance with one aspect of the present invention there is disclosed a novel hammer drill bit chuc.k attachment comprising a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis. An impact member is mounted in fixed relation on the main shaft for rotation therewith. An actuator mechanism is mounted on the main shaft for free rotation of the ma.a.n shaft with respect to the actuator mechanism and for longitudinal sliding movernent of the actuator mechanism alorig the main shaft between -a forwardly displaced posiLion and a rearwardly displaced position. At least one impact portion is disposed on one of the impact member and the actuator mechanism. At least one roller member is 'rotaLionally mounted on the other of the impact member and the actuator mechanism. Rotation of the main shaft and impact member about the longitudinal axis when the actuator mechanism is in force Lransmitting engagement with the impact member, causes the actuator mechanism to move in a reciprocating motion between the forwardly displaced position and the rearwardly displaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
[00012] Other advantages, features and characteristics of the present invention, as well as methocis of operation and functions of the related elements of the structure, and the.combination of parts and economies of manufacture, will become more apparent upon consideration of the following detailed description and the appended claims with reference to the accompanying drawings, the latter of which i5 briefly described herein below.
BRIEF DESCRIPTION OF THE DRAWINGS
1000131 The novel. features which are believed to be characteristic of the hammer dril], bit and hammer drill bit chuck attachment according to the present invention, as to its structure, organization, use and method of operation, together with further objectives and advantaqes thereof, will be better understood from the following drawings in which a presentl.y preferred embodiment of the invention will now be ill.ustrated by way of example. It is expressly understood, however-, L=hat the drawings are for the purpose of illustration arid description only, and are not intended as a definition of the limits of the invention. In the ac:companying drawings:
[00014] Figure 1 is a perspective view from the front of the first preferred embodiment of the hammer drill bit uhuck attachment accordinq to the present invention;
[00015] Figure 2 is a perspective view from Lhe rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00016] Figure 3 is an exploded perspective view from the front of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00017] Figure 4 is an exploded perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00018] Figure 5 is an enlarged exploded perspective view from the front of a portion of the second preferred embodiment hammer drill bit chuck attachment of Fi.gure 1;
[00019] Figure 6 i.s an enlarged exploded perspective view from the back of a portion of the second preferred embodiment hammer drill bit chuck attachment of Figure 1;
[00020] Figure 7 is a side elevational view of the hammer drill bit chuck attachment of Figure 1, but with the actuator mechanism in a fully forward position;
[00021] k'a.gure B is a perspective vi.ew f.rom the rear of the hammer drill bit chuck attachment as shown in Figure 7;
100022) Figure 9 is a side elevational view similar to Figure 7, but with the actuator mechanism in a diserigaged positiori;
[00023] Figure 10 is a pcrspective view from the front of a second preferred embodiment of the ha.mmer drill bit, chuck -attachment according to the present.invention;
[00024] Figure 11 is a perspective view of a portion of the second preferred ezn.bodiment of the hammer drill bit chuck attachment of Figure 10;
[00020] Figure 7 is a side elevational view of the hammer drill bit chuck attachment of Figure 1, but with the actuator mechanism in a fully forward position;
[00021] k'a.gure B is a perspective vi.ew f.rom the rear of the hammer drill bit chuck attachment as shown in Figure 7;
100022) Figure 9 is a side elevational view similar to Figure 7, but with the actuator mechanism in a diserigaged positiori;
[00023] Figure 10 is a pcrspective view from the front of a second preferred embodiment of the ha.mmer drill bit, chuck -attachment according to the present.invention;
[00024] Figure 11 is a perspective view of a portion of the second preferred ezn.bodiment of the hammer drill bit chuck attachment of Figure 10;
[00025] Figure 12 is a perspective view from the fraiit of the third preferred embodiment of the hammer drill bi't chuGk according to the present invention, without a drill chuck in place;
[00026] Figure 13 is a perspective view from the rear of the third preferred ernbodimerlt hammer drill biL chuck of Fiquxe 12;
[00027] Vigure 14 is a side elevationa.l., view of the third preferred embodiment hammer drill bit chuck of Figure 12, with the actuator mechanism in its engaged position;
[00028] Figure 15 is a side elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12, with the actuator mechanism in its disengaged position;
[00029] Figure 16 is a rear elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00030] Figure 17 is an exploded perspective view from the fron-C
of the third preferred embodiment hammer drill bit chuck of Figure 12;
-$-{00031] Figure 18 is an exploded perspective view from the rear of the third preferred embodinient hammer drill bit chuck of Figure 12;
[00032] Figure 19 is an exploded side elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00033] Figure 20 is a perspective view from the front of the third preferred embodiment hammer drill bit chuck of Figure 12, without a drill chuck in place;
[00034] Figure 21 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00035) Figure 22 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing i:he _actuator collar;
[00036] Figure 23 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the sLationary toothed collar and the elongate main shaft;
[00037] Figure 24 is a end elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the actuator r_ol lar. ;
[00038] Figure 25 is a perspective view fron- the front of an alternative embodiment of the hammer drill bit chu.ck accordinq to the present invention;
1000391 Figure 26 is an exploded perspective view from the front of the fourth preferred embodiment of the hammer drill bit chuck according to the present invention;
[00040] Figure 27 is an exploded perspective view from the rear of the fourth preferred embodiment of Figure 26;
100041] Figure 28 is a cross-sectional view of the fourt;h preferred embodimeilL of Figure 26, in place on a drill chuck; and, [000421 Figure 29 is a cross-sectional view of the fourth preferred embodinient of Figure 26, withouL the drill chuck.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[000431 Referring to Figures 1 through 29 of the drawings, it will be noted that Figures 1 through 9 illust_rate a first preferred embodiment of the hammer drill bit chuck attachment of the present invention, Figures 10 and 11 illustrates a second preferred embodiment of the hammer drill bit chuck attachment of the present invention, Figures 12 through 25 illustrate a third preferred einbodiment of the hammer drill bit chuck attachment of the presenL
invention, and 26 through 29 illustrate a fourth preferred embodintent of the hammer drill bit chuck attachment of the present invention.
[000447 Reference will now be made to Figures 1 through 9, which show a first preferred embodiment of the hammer drill bit chuck attachment of the present i.nvenT_ion, as indicated by general reference numeral 120. The hanuner drill bit chuck attachment 120 compzises a main shaft 7.30 having a threaded forward drill chuck end portion 132, an intermedaate i:mpac:t member receiving portion ~= ..
133, and a rearward shank portion 134. The main shaft 130 defines a longitudinal axis "L" about which the main shaft 130 rotates.
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[00045] A drill. bit chuc_k 135 is mountable on the forward drill chuck end portion 132 of the main shaft 130 for rotation therewith, as can be best seen in Figures 1 and 2. The dri I.I. bit c:huc:k 135 is a conventional drill bit chuck and c;otnprises three movablP jaw members 136 that receive and retaiil a conventional drill bit 129 therein. A ferrule member 137 surrounds the jaw members 136 and is wedged between the jaw members 136 and an outer housing 138 to keep the jaw members 136 locked in place on the conventional drill bit 129. A base meiiLber 139 is secured in place within the outer housing 138 and the back end 136b of the jaw members 136. The base member 139 has a threaded bore hole 139a that receives a co-operating threaded forward portion 134a of the rearward shank portion 134 i.n.secure engagement. Fundamentally, the hammer drill bit chuck attachment 120 comprises a main shaft 130, an impact member 190 and an actuator mechanism 150, as wil]. be described in greater detail below.
[00046] An impact member 140 comprises a main. body portion 142, a forwardly facing surface 145, a rearward fac.:inc~ surface 146 and at least one impact portion. Alternatively, the at least one i_mpact member can be mounted on the actuator mechanism 150. In the first preferred embodiment, as illustrated, the at least one impact portion comprises a plurality of impact portions 149. As can be readily seen in the figures, the plurality of impact portions 149 comprise a plurality of impact protrusions 149. Alternatively, it is contempiated that the pluraliL"y of impact portions could comprise a plurality of impacL- indentations. As illustrated, there are twenty-four impact protrtisions 1,49 substantially evenly spaced around the rearwardly facing surface 146 of the impact member 140.
Alternatively, ther.e can be any suitable number of impact portions.
[00047] The itnpac:t inember 140 is mounted in fixed relation on the main shaft 130 for rotation therewith, and projects radially outwardly from the intermediate irapact member receiving portion 133. The impact member 140 is threadibly engaged on the intermediate i.mpact member receiving portion 133 the main shaft 130. The threads on the forward drill chuck end portion 7.32 and the intermediate impact member receiving portion 133 are co-operatingly aligned with each other such that the impact member 140 can be threadibly engaged from the forward drill chuck end portion 132 to the intermediate impact member receiving portion 133. The rearward facing impact surface 146 may be integrally formed ori L.he ma.in body portion 142, or alternatively, as shown in Figures 10 and 11 may be formed on a rearward ring member 145. The alternative embodi.ment as shown in Figure 10 also shows a protective sheath 147 disposed over the actuator mechanism 150.
The protective sheath 147 is preferably made rrom a suitable plastic material and is overmolded over the ,actuator mechanism 150.
The plastic protective sheath 10 irisulates an operator's hand from potential electric shock i.f the drill bit 129 happens Lo conLact a live electrical wire during drilling.
+- 13 -[000481 The rearward facing impact surface 146 has a plurality of radially directed teeth 148 that are substantially evenly spaced around the rearward facing impact surface 146. Alternatively, the radially directed teeth 148 of the rearward facing impact surface 146 may be irregularly spaced, or spaced apart in any other suitable manner.
[00049] An actuator mechanism 150 comprises a main body member 152, a forwardly facing surface 156 and a rearwardly facing surface 155. The actuator mechanism 150 is mounted on the main shaft 130, mostly at the rearward shank portion 134 rearwardly of the impact member 140, for free rotation about the main shaft 130 and for lonqitudinal s].a.dinq movement along the main shaft 130. In the preferred embodiment, as illustrated, the actuator mPc:hanism 150 1.s retained on the rearward shank portion 134 by means of d"C"-clip 160 securely eriqaged in an aruiular slot 162 in the rearward shank portion 134,. Other stiitable means may a.iso be used.,. The section of the rearward shank portion 134 disposed rearwardly of the impact member 140 tuust_ be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
[00050] At least one roller member, and in the first preferred embodiment as a..l.l.ustrated, a plurality of roller members (specifically three roller members 160), are rotationally mounted on the main body member 152 of the actuator mechanism 150 by means of mounting pins 161 press fit into cooperating apertures 153 in the main body member 152. Alternatively, the roller members 160 could be mounted on the impact member 140. The axis of rotation "R" of each roller member 160 is substanti.a]..ly perpendicular to the longitudinal. axis "L" of the main shaft 150. The roller member.s 160, as illustrated, are bearing assem.blies having an outLer ring freely rotatably mounted onto an inner hub. other suitable designs of roller members 160 could also be used.
[00051] The actuator meChanism 150 is mounted on the rearward shank portion 134, as described above, in freely rotatable relation on the main shaft 130 for rotation about the rearward shank port_ion 134 and for longitudinal s].idi.ng movement along the main shaft 130 between a forward forwardly displaced position, as is best seeri in Figures 7 and 9, and a rearward rearwardly displaced position, as is be:;t: seen in. Figure 8. The "C"-clip 160 defines the rearward rearwardly displaced position of the actuator collar.
[00052] A manually manipulable handle 1.70 is removably connected to the actuator mechanism 150 by means of a threaded shaft 172 threadibly engaged in a co-operating thr-edded bore hole 151_ The handle 170 permits manual manipulation of the actuator mechanism 150 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 150 belween the forward forwardly displaced position and the rearward rearwardly displaced position. The manually manipulable handle 170 is preferably made from a suitable plastic material in order to insulate an Uperator's hand from potential electric shock if the driil bit 129 happens to contact a live clectrical wirc during drilling.
[00053] The rearward shank portion 134 merely freely rotates within the actuator mechanism 150. When the manually manipulable handle 170 is not held by a user, the actuator mechanism 150 e3Tld thc handle 170 do not rotate with the rearward shank portion 1.34, but remain essentially in one position due to the weight of the handle 170.
[00054] Rotation of the main shaft 130 and the impact member 140 abouF the longitudinal axis "L" when the actuator mechanism is in its forwardly di.splaced position; the roller members 160 engage thc plurality of impact protrusions 149 on the rearward facing impact surface 1.46 of the impact member 140 as the main shaft 130 rotates wiLh respert to the actuator mechanism 150, as would occur during normal use of an electric drill (not shown) The actuator mechanism 150 is thereby caused to move in a reciprocating motion between its forwardly displaced position and its rearwardly displaced position. In this manner, the roiler members 160 impart reciprocating motion along the longitudinal axis "L" to the main shaft 130, to thereby transmit impact forces forwardly along the longitudinal axis "L" to the main shaft 130, and therefore to the conventional drill bit 129. 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 i,mpact all of the impact protrusions 149, or impacts only higher portions of the impact protrusions 149, depending on the speed of rotation of the impact member 140 with respect with the actuator mechanism 150.
[00055] The height, radius of curvature, shape and number of teeth 148 will affect the frequency and amplitude of the impacts of L-he roller members 150 on the rearward facing impact surface 146.
[00056] As can be readily seen in Figure 10, the rearward ring member 145 maybe set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired.
, ,. ~.
[00057] As described above, the conventional drill bit 129 is caused to "hammer" into a piece of material a5 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 reaction of the impact of the roller members 160 on the teeth 148 of the rearward facing toothed surface 146.
(00058} A spring means 170 is operatively mourited between the actuator mechanism 150 and the main shaft 130 for biasing the actuator mechanism 150 to the forward forwardly displaced position.
More specifically, the spring means 170 comprises a coil spring 170 that is operatively mounted between the actuator mechanism 150 and the impact member 140 through the main shaft 130. The back end of the coil spring 170 bears against a washer 153, which itself bears against the "C"-clip 160. The front end of the coil spring 170 bears against a roller bearing 151 securely seated within the actuator mechanism 150. in this manner, the coil spring 170 biases the actuator mechanism 150 through i.ts forward forwardly displaced position. Accordingly, when the elongate main shaft 30 and the impact member 140 are rotated, the actuator mechanism 150 is rotated therewith. In use, the actuator mechanism 150 is moved slightly rearwardly to its forward forwardly displaced position against the force of the cozl spring 170. Further rearward movement of the actuato.r, mechanism 150 will caiise the actuator mochanism 150 to move to its rearwardly displaced position.
[00059] In an alternative embodiment of the present invention (not illust:rated), it is contemplated that a spring could bias the actuator mechanism 150 to it5 rearwardly displaced position.
Accordingly, the actuator mechanism 150 does not rotate, or at least not subst.antially so, when the main shaft. 130 is rotated during use. This is advantageous in that when the actuator mechanism 150 is grasped by an operator for use, it is not rotating, and is therefore more readily grasped.
[00060] It has been found that with the hammer drill bit chuck attachment 120 of the present invention, there is reduced friction, reduced heat build up, reduced wear and improved drilling performance compared with conventiorial hammer drills, which have two sets of impacting steel teeth used to perform the hammering fun.ction. IIeat build up is of particular concern uiider IEC
60745-1:2001, as adopted by UL, CSA and other national governing bodies regulating safety iri hand held power tools and accessories.
~. , An electric drill using the present invention experiences very minimal loss of speed due to the reduced friction between the roller members 150 and the impact member. Accordingly, the rotational energy is d-i-rected to the actual longitudina]. vibration, and not to losses due to friction and heat. This is important for being able to achieve the maximum possible speed with a drill, and also for reduced wear of the hammer drill bit chuck attachment of the present invention and an electric drill being used. In contrast, an electric hammer drill actually operates at a significantly reduced rotational speed compared to the maximum rotational speed of the drill, due to the friction of the steel teeth.
[00051] Reference will now be made to Figures 10 and 11, which show a second preferred embodiment of the hammer drill bit chuck attachment of the present inven-tion, as indicated by general reference numeral 220. The second preferred embodiment hammer drill bit chuck attachment 220 is similar to the first preferred embodiment hammer drill bit chuck attachment 120 except that the rearward facing impact surface 246 is formed on a rearward ring member 245 that is secured to the main body portion 242. The rearward ring member 245 may be set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired. The second preferred embodiment also shows a protective sheath 247 disposed over the actuator mechanism 250. The protective sheath 247 is preferably made from a suitablQ pla9tic mate.r.i.al. and is overmolded over the actuator mechanism 250. The plastic protective sheath 247 insulates an operator's hand from potential electric shock if the drill bit (not specifically shown) happens to contact a live electrical wire during drilling.
j00062] Reference will now be made to Figures 12 through 25, which show a third preferred embodiment of the hammer drill biL
Chuck attachment of the present invention, as indicated by general reference numeral 320. The haznmer drill bit chuck attachment 320 comprises a main shaft 330 having a threaded forward drill chuck end portion 332, an intermediate impact member receiving portion 333, and an elongate rearward shank portion 334. The main shaft 330 defines a longitudinal axis "L" about which the main shaft 330 rotates.
[00063] A drill bit chuck 335 is mountable on thp threaded forward drill chuck end portion 332 for rotation therewith. The drill bit chuck 335 is preferably a conventional drill bit chuck and comprises three movable jaw members 336 that receive and retain a conventional drill bit 329 therein. A ferrule member 337 surrounds the jaw members 336 and is wedged between the jaw members 336 and an outer housing 338 to keep the jaw members 336 locked in place on the conventional drill bit 329. A base member 339 is secured in place within the outer housing 338 and the back end 336b of the jaw members 336. The base member 339 has a threaded bore hole 339a that receives a co-operating threaded forward portion 334a of the rearward shank portion 334 in secure engagernent.
Fundamentally, the hammerdrill bit chuck attachment 320 comprises a main shaft 330, an impact member 340, and an adapter mechanism 350, as will be described in greater detail below.
[00064) An impact member 340 comprises a main body portion 342, a forwardly facing surface 345 and a rearwardly facing surface 346, and at least one impact portion. Alternatively, the at least one impact member can be mounted on the actuator mechanism 350. In the third preferred embodiment, as illustrated, the at least one impact portion comprises a plurality of impact portions 348. As can be readi.ly seen in the figures, the plurality of ball bearings 348 rotatably mounted in the rearwardly facing surface 346 of the impact member 340. Alternatively, it is contemplated that the plurality of impact portions could comprise a plurality of impact indentations. As illustrated, there are twenty-four impact protrusions 348 substantially evenly spaced arouzid 4he rearwardly t ~.
facing surface 346 of the impact member 340. A1ternatively, there can be any suitable number of impact portions.
,. .
[00065] The impact member 340 is mounted in fixed relation on the main shaft 330 for rotation therewith, and projects radially outwardly from the intermediate impact member receiving portion 333. The impact n mber 340 is slid over the elongate rearward shank portion 334 and is press-fit onto the intermediate impact member receiving portion 333 of the main shaft 330. The inter-mediate impact member receiving portion 333 is a few thpusandths of an inch larger in diameter than the elongate rear shank portion 334_ [00066] An actuator mechanism 350 having a forwardly facing surface 356 and a rearwardly facing surface 355 is mounted in freely rotatable relation on the zearward shank portion 334 of the main shaft 330, immediately rearwardly of the impact member 340, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement along the rearward shank portion 334.
In the preferred embodiment, as illustrated, the actuator mechanism 350 is retained ori the rearward shank portion 334 by means of a "C"-clip 360 securely engaged in an annular slot 362 in the rearward shank portion 334, that bears against a washer 361. A
second annular slot 362 is also included. Other suitable means may also be used. The section of the rearward shank portion 334 disposed rearwardly of the actuator mechanism 350 must be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
[00067] The actuator mechanism 350 is mount.ed on the rearward shank portion 334, as described above, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement albng the rearward shank portion 334 between a forward forwardly displaced position, as is best seen in Figures 12, 13, 14, 20 and 21, and a rearward rearwardly displaced position, as is best seen in Figure 28. The "C"-clip 360 defines the rearward rearwardly displaced position of the actuator collar.
[00068] The actuator mechanism 350 has at least one roller member rotationally mounted thereon, and in the third preferx-ed embodiment as illustrated, has at least one ball bearing 358 mounted thereon. More specifically, the at least one ball bearing 350 cornpr.a.ses a plurality (specifically twelve) ball bearings 358 roi:ationally mounted in, the forwardly facing surface 356 of the actuator mechanism 350. The ba'll bearings 358 are rotationally mounted and otherwise positioned to engage the ball hearings 348 in the impact member 340, as will be discussed in greater detail subsequently.
[00069] The ball bearings 358 in -the actuator mechanism 350 and the ball 2?earings 348 in the impact member 340 are, each mounted within a co-operating cylindrical recess 349,359 having a diameter slightly greater than the diameter of the ball bearings 348, 35E3, and a depth slightly less than the diameter of the ball bearings 348,358, so that the ball bearings 348,358 project outwardly from t-he cooperati.ng recesses 349,359 respectfully. Preferably, the ball bearings 348,358 are each mouriL-ed within the co-operating recesses 349,359 by means of a suitable grease type material, so as to help retain the ball bearings 348,358 in place.
[00070I It has been found that ball bearings 348,358 having a diameter of about 5/16" are suitable, although other sizes of ball bearings 348,358 could also be used. It has also been found that the ball bearings 348,358 of about this size should protrude beyond the rearwardly facing surface 346 of the impact member 340 and the forwardly facing surface 356 of the actuator mechanism 350, as the case may be, by up to about 0.050", or even more, and preferably by about 0.025", depending on the diameter of the ball bearings 348,358. Although the ball bearings 348 and the ball bearings 358 are shown to be the same diameter as each other, this is not absolutely necessary.
[00071] As can be seen in the Figures, there is also an optional elongate bore hole 353 in communication with each recess 359 in the actuator mechanism 350, for permitting the ball bearings 358 t~o be readily removed.
[00072] Rotation of the main shaft 330 and the impact member 340 about the longitudinal axis "L" when the actuator mechanism 150 is in its forward forwardly displaced position, causes the bal,7.
bearings 358 in the actuator mechanism 350 are in engagement with the ball bearings 348 (the impact portions) of the impact member 340 as the rearward main shaft 330 is rotated. The ball bearings 358 in the forwardly facing surface 356 of the actuator mechanism 350 quickly impact the ball bearings 348 in the rearwardly facing surface 346 of the impact member 340, as the main shaft 330, and therefore the impact member 340, is rotated by the conventional electric drill 322. The actuator mechanism 350 Is thereby caused to move in a reciprocating motion between its forwardly displaced position and its rearwardly displaced position The actuator mechanism 350 thereby imparts reciprocating motion along the longitudinal axis "L" to the drill bit chuck 335, to thereby transmit impact forces along the longitudinal axis "L" to the main shaft 350, and therefore to the conventional drilJ. bit 329 retained therein. In this manner, the conventional drill bit 329 is caused to "hammer" into a piece of material as it rQtates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or conC:rrm.tP- 'T'ha nltiral -ii-v r~-F 1na11 }oarir~rJa 4R earyd 358 _,-$, each rotationally mounted in evenly radially spaced relation around the longitudinal axis "L" to provide for an even impacting action.
It should also be noted that the drill 322 itself does not absorb the reaction of the impact of the ball bearings 358 of the actuator mechanism 350 on the ball bearings 348 of the impact member 340.
[000731 In the rearward rearwardly dasplaced position, the ball bearings 358 of the actuator mechanism 350 are removed from the rotational engagement with the ball bearings 348 of the impact member 340. The rearward shank portion 334 of the main shaft 330 merely freely rotates within the actuator mechanism 350, or alternatively, the actuator mechanism 350 merely freely rotates around the rearward shank portion 334 of the main shaft 330.
[00074] The third preferred embodiment hammer drill bit chuck attachment 320 further comprises an insulating cover 351 . ~.
peripherally surrounding the actuator mechanism 350. Preferably, the insulating cover 35:E. j,s made from a synthetic rubber or plastic material, and is overmolded oti the actuator mechanism 350. The i.nsulating cover 351 is used to electrica.lly insulate the actuator mechanism 350 from a user's hand, when a user grasps the actuator mechanism 350 during use to preclude the actuator mechanism 350 from turning with the impact member 340, . thus allowing the ball bearings 358 on the actuator mechanism 350 to impact the ball bearings 348 on the impact member 340, thereby imparting reGiprocating motion along the long~tudinal axis "L" to the main shaft 330. It has been found that grasping the insulating cover 351 permit for the accurate application of manual force along the longitudinal axis "L".
-[000751 It can also be seen that the third preferred embodiment hammer drill bit chuck attachment 320 permits bi-d.i-rectional rotational operation of the elongate main shaft 330 and therefore the forward drill bit portion 332, although it would not be overly common to require the third preferred embodiment hammer drill bit 320 to operate it the reverse direction.
[00076) In an alternative embodiment, a shown in Figure 25, it is contemplated that a manually manipulable handle 370 is removably connected to the actuator mechanism 350 -by means of a threaded shaft 372 threadibly engaged in a co-operating threaded bore hole 371. The handle 370 permits manual manipulation of the actuator mechanism 350 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 350 between the forward forwardly displaced position and the rearward rearwardly displaced position. When the manually manipulable handle 370 is not held by a user, the actuator mechanism 350 and the handle 370 do not rotate with the main shaft 330, but remain essenti.ally in one position due to the weight of the handle 3'10.
I.
Reference will now be made to Figures 26 through 29, which shows a.f.ourth preferred embodiment of 'the hammer drill bit chuck attachment of the present invention, as indicated by general reference numeral 420. The fourth px'eferred embodiment of the hammer drill bit chtick attachment 420 is similar to the third preferred embodimerit of the hammer drill bit chuck attachment 320, except for the inclusion of a spring means 470 operatively mounted between the actuator collar 450 and the elongate main shaft 430 for biasing the actuator collar 450 to the forward forwardly displaced position. More specifically, the spring means 470 comprises a coil spring 470 that is operatively mounted between the actuator collar 450 and the stationary toothed collar 440. The coil spring 470 sits within a recess 452 in the back end of the actuator collar 450, and surrounds the back end of the shank portion 434 of the elongate main shaft 430. The coil spring 470 bears against the forward end 452a of the recess 452 and also bears against a washer 453, wliich itself bears against the "C"-clip 460. In this manner, the coil spring 470 biases the actuator collar through its forward forwardly displaced position and to its fully forward position.
Accordingly, when the elongate main shaft 430 and the stationary toothed collar 440 are rotated, the actuator collar 450 zsrotated therewith. In use, the actuator collar 450 is moved slightly rearwardly to its forward.forwardly displaced position against the force of the coil spring 470.
[000781 As can be understood from the above description and from the accompanying drawings, the present invention provides a hammer drill bit chuck attachment that is inexpensive to manufacture, that is robust, wherein the frequency and amplitude of impacts can be adjusted or selected, wherein heat build up is minimized, and wherein an electric drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotational speeds, all of which features are unknown in the prior art.
[00079] Qther variations of the above principles will be apparent to those who are knowledgeable in the field of the invention, and such variations are considered to be within the scope of the present invention. Further, other modifications and alterations .. ..
may be used in the design and manufacture of the hammer drill bit and hammer drill bit chuck attachment of the present invention without departing from the spirit and scope of the accompanying claims.
[00026] Figure 13 is a perspective view from the rear of the third preferred ernbodimerlt hammer drill biL chuck of Fiquxe 12;
[00027] Vigure 14 is a side elevationa.l., view of the third preferred embodiment hammer drill bit chuck of Figure 12, with the actuator mechanism in its engaged position;
[00028] Figure 15 is a side elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12, with the actuator mechanism in its disengaged position;
[00029] Figure 16 is a rear elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00030] Figure 17 is an exploded perspective view from the fron-C
of the third preferred embodiment hammer drill bit chuck of Figure 12;
-$-{00031] Figure 18 is an exploded perspective view from the rear of the third preferred embodinient hammer drill bit chuck of Figure 12;
[00032] Figure 19 is an exploded side elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00033] Figure 20 is a perspective view from the front of the third preferred embodiment hammer drill bit chuck of Figure 12, without a drill chuck in place;
[00034] Figure 21 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12;
[00035) Figure 22 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing i:he _actuator collar;
[00036] Figure 23 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the sLationary toothed collar and the elongate main shaft;
[00037] Figure 24 is a end elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the actuator r_ol lar. ;
[00038] Figure 25 is a perspective view fron- the front of an alternative embodiment of the hammer drill bit chu.ck accordinq to the present invention;
1000391 Figure 26 is an exploded perspective view from the front of the fourth preferred embodiment of the hammer drill bit chuck according to the present invention;
[00040] Figure 27 is an exploded perspective view from the rear of the fourth preferred embodiment of Figure 26;
100041] Figure 28 is a cross-sectional view of the fourt;h preferred embodimeilL of Figure 26, in place on a drill chuck; and, [000421 Figure 29 is a cross-sectional view of the fourth preferred embodinient of Figure 26, withouL the drill chuck.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[000431 Referring to Figures 1 through 29 of the drawings, it will be noted that Figures 1 through 9 illust_rate a first preferred embodiment of the hammer drill bit chuck attachment of the present invention, Figures 10 and 11 illustrates a second preferred embodiment of the hammer drill bit chuck attachment of the present invention, Figures 12 through 25 illustrate a third preferred einbodiment of the hammer drill bit chuck attachment of the presenL
invention, and 26 through 29 illustrate a fourth preferred embodintent of the hammer drill bit chuck attachment of the present invention.
[000447 Reference will now be made to Figures 1 through 9, which show a first preferred embodiment of the hammer drill bit chuck attachment of the present i.nvenT_ion, as indicated by general reference numeral 120. The hanuner drill bit chuck attachment 120 compzises a main shaft 7.30 having a threaded forward drill chuck end portion 132, an intermedaate i:mpac:t member receiving portion ~= ..
133, and a rearward shank portion 134. The main shaft 130 defines a longitudinal axis "L" about which the main shaft 130 rotates.
~= ,.
[00045] A drill. bit chuc_k 135 is mountable on the forward drill chuck end portion 132 of the main shaft 130 for rotation therewith, as can be best seen in Figures 1 and 2. The dri I.I. bit c:huc:k 135 is a conventional drill bit chuck and c;otnprises three movablP jaw members 136 that receive and retaiil a conventional drill bit 129 therein. A ferrule member 137 surrounds the jaw members 136 and is wedged between the jaw members 136 and an outer housing 138 to keep the jaw members 136 locked in place on the conventional drill bit 129. A base meiiLber 139 is secured in place within the outer housing 138 and the back end 136b of the jaw members 136. The base member 139 has a threaded bore hole 139a that receives a co-operating threaded forward portion 134a of the rearward shank portion 134 i.n.secure engagement. Fundamentally, the hammer drill bit chuck attachment 120 comprises a main shaft 130, an impact member 190 and an actuator mechanism 150, as wil]. be described in greater detail below.
[00046] An impact member 140 comprises a main. body portion 142, a forwardly facing surface 145, a rearward fac.:inc~ surface 146 and at least one impact portion. Alternatively, the at least one i_mpact member can be mounted on the actuator mechanism 150. In the first preferred embodiment, as illustrated, the at least one impact portion comprises a plurality of impact portions 149. As can be readily seen in the figures, the plurality of impact portions 149 comprise a plurality of impact protrusions 149. Alternatively, it is contempiated that the pluraliL"y of impact portions could comprise a plurality of impacL- indentations. As illustrated, there are twenty-four impact protrtisions 1,49 substantially evenly spaced around the rearwardly facing surface 146 of the impact member 140.
Alternatively, ther.e can be any suitable number of impact portions.
[00047] The itnpac:t inember 140 is mounted in fixed relation on the main shaft 130 for rotation therewith, and projects radially outwardly from the intermediate irapact member receiving portion 133. The impact member 140 is threadibly engaged on the intermediate i.mpact member receiving portion 133 the main shaft 130. The threads on the forward drill chuck end portion 7.32 and the intermediate impact member receiving portion 133 are co-operatingly aligned with each other such that the impact member 140 can be threadibly engaged from the forward drill chuck end portion 132 to the intermediate impact member receiving portion 133. The rearward facing impact surface 146 may be integrally formed ori L.he ma.in body portion 142, or alternatively, as shown in Figures 10 and 11 may be formed on a rearward ring member 145. The alternative embodi.ment as shown in Figure 10 also shows a protective sheath 147 disposed over the actuator mechanism 150.
The protective sheath 147 is preferably made rrom a suitable plastic material and is overmolded over the ,actuator mechanism 150.
The plastic protective sheath 10 irisulates an operator's hand from potential electric shock i.f the drill bit 129 happens Lo conLact a live electrical wire during drilling.
+- 13 -[000481 The rearward facing impact surface 146 has a plurality of radially directed teeth 148 that are substantially evenly spaced around the rearward facing impact surface 146. Alternatively, the radially directed teeth 148 of the rearward facing impact surface 146 may be irregularly spaced, or spaced apart in any other suitable manner.
[00049] An actuator mechanism 150 comprises a main body member 152, a forwardly facing surface 156 and a rearwardly facing surface 155. The actuator mechanism 150 is mounted on the main shaft 130, mostly at the rearward shank portion 134 rearwardly of the impact member 140, for free rotation about the main shaft 130 and for lonqitudinal s].a.dinq movement along the main shaft 130. In the preferred embodiment, as illustrated, the actuator mPc:hanism 150 1.s retained on the rearward shank portion 134 by means of d"C"-clip 160 securely eriqaged in an aruiular slot 162 in the rearward shank portion 134,. Other stiitable means may a.iso be used.,. The section of the rearward shank portion 134 disposed rearwardly of the impact member 140 tuust_ be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
[00050] At least one roller member, and in the first preferred embodiment as a..l.l.ustrated, a plurality of roller members (specifically three roller members 160), are rotationally mounted on the main body member 152 of the actuator mechanism 150 by means of mounting pins 161 press fit into cooperating apertures 153 in the main body member 152. Alternatively, the roller members 160 could be mounted on the impact member 140. The axis of rotation "R" of each roller member 160 is substanti.a]..ly perpendicular to the longitudinal. axis "L" of the main shaft 150. The roller member.s 160, as illustrated, are bearing assem.blies having an outLer ring freely rotatably mounted onto an inner hub. other suitable designs of roller members 160 could also be used.
[00051] The actuator meChanism 150 is mounted on the rearward shank portion 134, as described above, in freely rotatable relation on the main shaft 130 for rotation about the rearward shank port_ion 134 and for longitudinal s].idi.ng movement along the main shaft 130 between a forward forwardly displaced position, as is best seeri in Figures 7 and 9, and a rearward rearwardly displaced position, as is be:;t: seen in. Figure 8. The "C"-clip 160 defines the rearward rearwardly displaced position of the actuator collar.
[00052] A manually manipulable handle 1.70 is removably connected to the actuator mechanism 150 by means of a threaded shaft 172 threadibly engaged in a co-operating thr-edded bore hole 151_ The handle 170 permits manual manipulation of the actuator mechanism 150 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 150 belween the forward forwardly displaced position and the rearward rearwardly displaced position. The manually manipulable handle 170 is preferably made from a suitable plastic material in order to insulate an Uperator's hand from potential electric shock if the driil bit 129 happens to contact a live clectrical wirc during drilling.
[00053] The rearward shank portion 134 merely freely rotates within the actuator mechanism 150. When the manually manipulable handle 170 is not held by a user, the actuator mechanism 150 e3Tld thc handle 170 do not rotate with the rearward shank portion 1.34, but remain essentially in one position due to the weight of the handle 170.
[00054] Rotation of the main shaft 130 and the impact member 140 abouF the longitudinal axis "L" when the actuator mechanism is in its forwardly di.splaced position; the roller members 160 engage thc plurality of impact protrusions 149 on the rearward facing impact surface 1.46 of the impact member 140 as the main shaft 130 rotates wiLh respert to the actuator mechanism 150, as would occur during normal use of an electric drill (not shown) The actuator mechanism 150 is thereby caused to move in a reciprocating motion between its forwardly displaced position and its rearwardly displaced position. In this manner, the roiler members 160 impart reciprocating motion along the longitudinal axis "L" to the main shaft 130, to thereby transmit impact forces forwardly along the longitudinal axis "L" to the main shaft 130, and therefore to the conventional drill bit 129. 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 i,mpact all of the impact protrusions 149, or impacts only higher portions of the impact protrusions 149, depending on the speed of rotation of the impact member 140 with respect with the actuator mechanism 150.
[00055] The height, radius of curvature, shape and number of teeth 148 will affect the frequency and amplitude of the impacts of L-he roller members 150 on the rearward facing impact surface 146.
[00056] As can be readily seen in Figure 10, the rearward ring member 145 maybe set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired.
, ,. ~.
[00057] As described above, the conventional drill bit 129 is caused to "hammer" into a piece of material a5 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 reaction of the impact of the roller members 160 on the teeth 148 of the rearward facing toothed surface 146.
(00058} A spring means 170 is operatively mourited between the actuator mechanism 150 and the main shaft 130 for biasing the actuator mechanism 150 to the forward forwardly displaced position.
More specifically, the spring means 170 comprises a coil spring 170 that is operatively mounted between the actuator mechanism 150 and the impact member 140 through the main shaft 130. The back end of the coil spring 170 bears against a washer 153, which itself bears against the "C"-clip 160. The front end of the coil spring 170 bears against a roller bearing 151 securely seated within the actuator mechanism 150. in this manner, the coil spring 170 biases the actuator mechanism 150 through i.ts forward forwardly displaced position. Accordingly, when the elongate main shaft 30 and the impact member 140 are rotated, the actuator mechanism 150 is rotated therewith. In use, the actuator mechanism 150 is moved slightly rearwardly to its forward forwardly displaced position against the force of the cozl spring 170. Further rearward movement of the actuato.r, mechanism 150 will caiise the actuator mochanism 150 to move to its rearwardly displaced position.
[00059] In an alternative embodiment of the present invention (not illust:rated), it is contemplated that a spring could bias the actuator mechanism 150 to it5 rearwardly displaced position.
Accordingly, the actuator mechanism 150 does not rotate, or at least not subst.antially so, when the main shaft. 130 is rotated during use. This is advantageous in that when the actuator mechanism 150 is grasped by an operator for use, it is not rotating, and is therefore more readily grasped.
[00060] It has been found that with the hammer drill bit chuck attachment 120 of the present invention, there is reduced friction, reduced heat build up, reduced wear and improved drilling performance compared with conventiorial hammer drills, which have two sets of impacting steel teeth used to perform the hammering fun.ction. IIeat build up is of particular concern uiider IEC
60745-1:2001, as adopted by UL, CSA and other national governing bodies regulating safety iri hand held power tools and accessories.
~. , An electric drill using the present invention experiences very minimal loss of speed due to the reduced friction between the roller members 150 and the impact member. Accordingly, the rotational energy is d-i-rected to the actual longitudina]. vibration, and not to losses due to friction and heat. This is important for being able to achieve the maximum possible speed with a drill, and also for reduced wear of the hammer drill bit chuck attachment of the present invention and an electric drill being used. In contrast, an electric hammer drill actually operates at a significantly reduced rotational speed compared to the maximum rotational speed of the drill, due to the friction of the steel teeth.
[00051] Reference will now be made to Figures 10 and 11, which show a second preferred embodiment of the hammer drill bit chuck attachment of the present inven-tion, as indicated by general reference numeral 220. The second preferred embodiment hammer drill bit chuck attachment 220 is similar to the first preferred embodiment hammer drill bit chuck attachment 120 except that the rearward facing impact surface 246 is formed on a rearward ring member 245 that is secured to the main body portion 242. The rearward ring member 245 may be set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired. The second preferred embodiment also shows a protective sheath 247 disposed over the actuator mechanism 250. The protective sheath 247 is preferably made from a suitablQ pla9tic mate.r.i.al. and is overmolded over the actuator mechanism 250. The plastic protective sheath 247 insulates an operator's hand from potential electric shock if the drill bit (not specifically shown) happens to contact a live electrical wire during drilling.
j00062] Reference will now be made to Figures 12 through 25, which show a third preferred embodiment of the hammer drill biL
Chuck attachment of the present invention, as indicated by general reference numeral 320. The haznmer drill bit chuck attachment 320 comprises a main shaft 330 having a threaded forward drill chuck end portion 332, an intermediate impact member receiving portion 333, and an elongate rearward shank portion 334. The main shaft 330 defines a longitudinal axis "L" about which the main shaft 330 rotates.
[00063] A drill bit chuck 335 is mountable on thp threaded forward drill chuck end portion 332 for rotation therewith. The drill bit chuck 335 is preferably a conventional drill bit chuck and comprises three movable jaw members 336 that receive and retain a conventional drill bit 329 therein. A ferrule member 337 surrounds the jaw members 336 and is wedged between the jaw members 336 and an outer housing 338 to keep the jaw members 336 locked in place on the conventional drill bit 329. A base member 339 is secured in place within the outer housing 338 and the back end 336b of the jaw members 336. The base member 339 has a threaded bore hole 339a that receives a co-operating threaded forward portion 334a of the rearward shank portion 334 in secure engagernent.
Fundamentally, the hammerdrill bit chuck attachment 320 comprises a main shaft 330, an impact member 340, and an adapter mechanism 350, as will be described in greater detail below.
[00064) An impact member 340 comprises a main body portion 342, a forwardly facing surface 345 and a rearwardly facing surface 346, and at least one impact portion. Alternatively, the at least one impact member can be mounted on the actuator mechanism 350. In the third preferred embodiment, as illustrated, the at least one impact portion comprises a plurality of impact portions 348. As can be readi.ly seen in the figures, the plurality of ball bearings 348 rotatably mounted in the rearwardly facing surface 346 of the impact member 340. Alternatively, it is contemplated that the plurality of impact portions could comprise a plurality of impact indentations. As illustrated, there are twenty-four impact protrusions 348 substantially evenly spaced arouzid 4he rearwardly t ~.
facing surface 346 of the impact member 340. A1ternatively, there can be any suitable number of impact portions.
,. .
[00065] The impact member 340 is mounted in fixed relation on the main shaft 330 for rotation therewith, and projects radially outwardly from the intermediate impact member receiving portion 333. The impact n mber 340 is slid over the elongate rearward shank portion 334 and is press-fit onto the intermediate impact member receiving portion 333 of the main shaft 330. The inter-mediate impact member receiving portion 333 is a few thpusandths of an inch larger in diameter than the elongate rear shank portion 334_ [00066] An actuator mechanism 350 having a forwardly facing surface 356 and a rearwardly facing surface 355 is mounted in freely rotatable relation on the zearward shank portion 334 of the main shaft 330, immediately rearwardly of the impact member 340, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement along the rearward shank portion 334.
In the preferred embodiment, as illustrated, the actuator mechanism 350 is retained ori the rearward shank portion 334 by means of a "C"-clip 360 securely engaged in an annular slot 362 in the rearward shank portion 334, that bears against a washer 361. A
second annular slot 362 is also included. Other suitable means may also be used. The section of the rearward shank portion 334 disposed rearwardly of the actuator mechanism 350 must be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
[00067] The actuator mechanism 350 is mount.ed on the rearward shank portion 334, as described above, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement albng the rearward shank portion 334 between a forward forwardly displaced position, as is best seen in Figures 12, 13, 14, 20 and 21, and a rearward rearwardly displaced position, as is best seen in Figure 28. The "C"-clip 360 defines the rearward rearwardly displaced position of the actuator collar.
[00068] The actuator mechanism 350 has at least one roller member rotationally mounted thereon, and in the third preferx-ed embodiment as illustrated, has at least one ball bearing 358 mounted thereon. More specifically, the at least one ball bearing 350 cornpr.a.ses a plurality (specifically twelve) ball bearings 358 roi:ationally mounted in, the forwardly facing surface 356 of the actuator mechanism 350. The ba'll bearings 358 are rotationally mounted and otherwise positioned to engage the ball hearings 348 in the impact member 340, as will be discussed in greater detail subsequently.
[00069] The ball bearings 358 in -the actuator mechanism 350 and the ball 2?earings 348 in the impact member 340 are, each mounted within a co-operating cylindrical recess 349,359 having a diameter slightly greater than the diameter of the ball bearings 348, 35E3, and a depth slightly less than the diameter of the ball bearings 348,358, so that the ball bearings 348,358 project outwardly from t-he cooperati.ng recesses 349,359 respectfully. Preferably, the ball bearings 348,358 are each mouriL-ed within the co-operating recesses 349,359 by means of a suitable grease type material, so as to help retain the ball bearings 348,358 in place.
[00070I It has been found that ball bearings 348,358 having a diameter of about 5/16" are suitable, although other sizes of ball bearings 348,358 could also be used. It has also been found that the ball bearings 348,358 of about this size should protrude beyond the rearwardly facing surface 346 of the impact member 340 and the forwardly facing surface 356 of the actuator mechanism 350, as the case may be, by up to about 0.050", or even more, and preferably by about 0.025", depending on the diameter of the ball bearings 348,358. Although the ball bearings 348 and the ball bearings 358 are shown to be the same diameter as each other, this is not absolutely necessary.
[00071] As can be seen in the Figures, there is also an optional elongate bore hole 353 in communication with each recess 359 in the actuator mechanism 350, for permitting the ball bearings 358 t~o be readily removed.
[00072] Rotation of the main shaft 330 and the impact member 340 about the longitudinal axis "L" when the actuator mechanism 150 is in its forward forwardly displaced position, causes the bal,7.
bearings 358 in the actuator mechanism 350 are in engagement with the ball bearings 348 (the impact portions) of the impact member 340 as the rearward main shaft 330 is rotated. The ball bearings 358 in the forwardly facing surface 356 of the actuator mechanism 350 quickly impact the ball bearings 348 in the rearwardly facing surface 346 of the impact member 340, as the main shaft 330, and therefore the impact member 340, is rotated by the conventional electric drill 322. The actuator mechanism 350 Is thereby caused to move in a reciprocating motion between its forwardly displaced position and its rearwardly displaced position The actuator mechanism 350 thereby imparts reciprocating motion along the longitudinal axis "L" to the drill bit chuck 335, to thereby transmit impact forces along the longitudinal axis "L" to the main shaft 350, and therefore to the conventional drilJ. bit 329 retained therein. In this manner, the conventional drill bit 329 is caused to "hammer" into a piece of material as it rQtates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or conC:rrm.tP- 'T'ha nltiral -ii-v r~-F 1na11 }oarir~rJa 4R earyd 358 _,-$, each rotationally mounted in evenly radially spaced relation around the longitudinal axis "L" to provide for an even impacting action.
It should also be noted that the drill 322 itself does not absorb the reaction of the impact of the ball bearings 358 of the actuator mechanism 350 on the ball bearings 348 of the impact member 340.
[000731 In the rearward rearwardly dasplaced position, the ball bearings 358 of the actuator mechanism 350 are removed from the rotational engagement with the ball bearings 348 of the impact member 340. The rearward shank portion 334 of the main shaft 330 merely freely rotates within the actuator mechanism 350, or alternatively, the actuator mechanism 350 merely freely rotates around the rearward shank portion 334 of the main shaft 330.
[00074] The third preferred embodiment hammer drill bit chuck attachment 320 further comprises an insulating cover 351 . ~.
peripherally surrounding the actuator mechanism 350. Preferably, the insulating cover 35:E. j,s made from a synthetic rubber or plastic material, and is overmolded oti the actuator mechanism 350. The i.nsulating cover 351 is used to electrica.lly insulate the actuator mechanism 350 from a user's hand, when a user grasps the actuator mechanism 350 during use to preclude the actuator mechanism 350 from turning with the impact member 340, . thus allowing the ball bearings 358 on the actuator mechanism 350 to impact the ball bearings 348 on the impact member 340, thereby imparting reGiprocating motion along the long~tudinal axis "L" to the main shaft 330. It has been found that grasping the insulating cover 351 permit for the accurate application of manual force along the longitudinal axis "L".
-[000751 It can also be seen that the third preferred embodiment hammer drill bit chuck attachment 320 permits bi-d.i-rectional rotational operation of the elongate main shaft 330 and therefore the forward drill bit portion 332, although it would not be overly common to require the third preferred embodiment hammer drill bit 320 to operate it the reverse direction.
[00076) In an alternative embodiment, a shown in Figure 25, it is contemplated that a manually manipulable handle 370 is removably connected to the actuator mechanism 350 -by means of a threaded shaft 372 threadibly engaged in a co-operating threaded bore hole 371. The handle 370 permits manual manipulation of the actuator mechanism 350 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 350 between the forward forwardly displaced position and the rearward rearwardly displaced position. When the manually manipulable handle 370 is not held by a user, the actuator mechanism 350 and the handle 370 do not rotate with the main shaft 330, but remain essenti.ally in one position due to the weight of the handle 3'10.
I.
Reference will now be made to Figures 26 through 29, which shows a.f.ourth preferred embodiment of 'the hammer drill bit chuck attachment of the present invention, as indicated by general reference numeral 420. The fourth px'eferred embodiment of the hammer drill bit chtick attachment 420 is similar to the third preferred embodimerit of the hammer drill bit chuck attachment 320, except for the inclusion of a spring means 470 operatively mounted between the actuator collar 450 and the elongate main shaft 430 for biasing the actuator collar 450 to the forward forwardly displaced position. More specifically, the spring means 470 comprises a coil spring 470 that is operatively mounted between the actuator collar 450 and the stationary toothed collar 440. The coil spring 470 sits within a recess 452 in the back end of the actuator collar 450, and surrounds the back end of the shank portion 434 of the elongate main shaft 430. The coil spring 470 bears against the forward end 452a of the recess 452 and also bears against a washer 453, wliich itself bears against the "C"-clip 460. In this manner, the coil spring 470 biases the actuator collar through its forward forwardly displaced position and to its fully forward position.
Accordingly, when the elongate main shaft 430 and the stationary toothed collar 440 are rotated, the actuator collar 450 zsrotated therewith. In use, the actuator collar 450 is moved slightly rearwardly to its forward.forwardly displaced position against the force of the coil spring 470.
[000781 As can be understood from the above description and from the accompanying drawings, the present invention provides a hammer drill bit chuck attachment that is inexpensive to manufacture, that is robust, wherein the frequency and amplitude of impacts can be adjusted or selected, wherein heat build up is minimized, and wherein an electric drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotational speeds, all of which features are unknown in the prior art.
[00079] Qther variations of the above principles will be apparent to those who are knowledgeable in the field of the invention, and such variations are considered to be within the scope of the present invention. Further, other modifications and alterations .. ..
may be used in the design and manufacture of the hammer drill bit and hammer drill bit chuck attachment of the present invention without departing from the spirit and scope of the accompanying claims.
Claims (20)
1. A hammer drill bit chuck attachment comprising:
a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis;
an impact member mounted in fixed relation on said main shaft for rotation therewith; and, an actuator mechanism mounted on said main shaft for free rotation of said main shaft with respect to said actuator mechanism and for longitudinal sliding movement of said actuator mechanism along said main shaft between a forwardly displaced position and a rearwardly displaced position;
at least one impact portion disposed on one of said impact member and said actuator mechanism; and, at least one roller member rotationally mounted on the other of said impact member and said actuator mechanism;
wherein rotation of said main shaft and impact member about said longitudinal axis when said actuator mechanism is in force transmitting engagement with said impact member, causes said actuator mechanism to move in a reciprocating motion between said forwardly displaced position and said rearwardly displaced position, and transmits impact forces forwardly along said longitudinal axis to said main shaft.
a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis;
an impact member mounted in fixed relation on said main shaft for rotation therewith; and, an actuator mechanism mounted on said main shaft for free rotation of said main shaft with respect to said actuator mechanism and for longitudinal sliding movement of said actuator mechanism along said main shaft between a forwardly displaced position and a rearwardly displaced position;
at least one impact portion disposed on one of said impact member and said actuator mechanism; and, at least one roller member rotationally mounted on the other of said impact member and said actuator mechanism;
wherein rotation of said main shaft and impact member about said longitudinal axis when said actuator mechanism is in force transmitting engagement with said impact member, causes said actuator mechanism to move in a reciprocating motion between said forwardly displaced position and said rearwardly displaced position, and transmits impact forces forwardly along said longitudinal axis to said main shaft.
2. The hammer drill bit chuck attachment of claim 1, wherein said at least one roller member comprises at least one ball bearing rotationally mounted in said actuator mechanism, and said at least one impact portion is on said impact member.
3. The hammer drill bit chuck attachment of claim 2, wherein said at least one ball bearing rotationally mounted in said actuator mechanism comprises a plurality of ball bearings rotationally mounted in said actuator mechanism.
4. The hammer drill bit chuck attachment of claim 3, wherein said plurality of ball bearings are rotationally mounted in evenly radially spaced relation around said longitudinal axis.
5. The hammer drill bit chuck attachment of claim 1, wherein said actuator mechanism is retained on said rearward shank portion of said main shaft by means of a "C"-clip securely engaged in an annular slot in said rearward shank portion.
6. The hammer drill bit chuck attachment of claim 1, further comprising spring means operatively mounted between said actuator mechanism and said main shaft for biasing said actuator mechanism to said forwardly displaced position.
7. The hammer drill bit chuck attachment 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 forwardly displaced position and said rearward rearwardly displaced position.
8. The hammer drill bit chuck attachment of claim 7, wherein said handle is removably connected to said actuator mechanism.
9. The hammer drill bit chuck attachment of claim 1, wherein said impact member has an impact surface and said at least one roller member engages said impact surface.
10. The hammer drill bit chuck attachment of claim 9, wherein said impact surface is rearwardly facing.
11. The hammer drill bit chuck attachment of claim 1, wherein said at least one roller member comprises a plurality of roller members.
12. The hammer drill bit chuck attachment of claim 11, wherein said plurality of roller members comprises three roller members.
13. The hammer drill bit chuck attachment of claim 3, wherein said plurality of ball bearings are rotationally mounted in evenly radially spaced relation around said longitudinal axis.
14. The hammer drill bit chuck attachment of claim 1, wherein said impact surface is rearwardly facing.
15. The hammer drill bit chuck attachment of claim 14, wherein said at least one roller member comprises a plurality of roller bearings.
16. The hammer drill bit chuck attachment of claim 12, wherein said plurality of roller bearings comprises three roller bearings.
17. The hammer drill bit chuck attachment of claim 15, wherein said plurality of roller bearings are rotationally mounted in evenly radially spaced relation around said longitudinal axis.
18. The hammer drill bit chuck attachment of claim 15, further comprising a manual manipulable handle connected to said actuator mechanism for permitting said longitudinal sliding movement of said actuator mechanism between said forward forwardly displaced position and said rearward rearwardly displaced position.
19. The hammer drill bit chuck attachment of claim 18, wherein said handle is removably connected to said actuator mechanism.
20. The hammer drill bit chuck attachment of claim 1, further comprising spring means operatively mounted between said actuator mechanism and said main shaft for biasing said actuator mechanism to said forwardly displaced position.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2555533 CA2555533A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill bit chuck attachment |
| PCT/CA2007/001378 WO2008017151A2 (en) | 2006-08-08 | 2007-08-08 | Hammer drill bit chuck attachment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2555533 CA2555533A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill bit chuck attachment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2555533A1 true CA2555533A1 (en) | 2008-02-08 |
Family
ID=39030917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2555533 Abandoned CA2555533A1 (en) | 2006-08-08 | 2006-08-08 | Hammer drill bit chuck attachment |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2555533A1 (en) |
| WO (1) | WO2008017151A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11278971B2 (en) * | 2019-04-02 | 2022-03-22 | Daltron Forge (Pty) Ltd | Drill steel and its manufacture |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202009017422U1 (en) * | 2009-06-26 | 2010-11-04 | Robert Bosch Gmbh | Hand-held power tool |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3509165C1 (en) * | 1985-03-14 | 1986-07-31 | Günter Horst 7927 Sontheim Röhm | Drill chuck |
| DE3636026A1 (en) * | 1986-10-23 | 1988-04-28 | Hilti Ag | HAND DEVICE WITH TOOL HOLDER |
| DE4215288A1 (en) * | 1991-07-08 | 1993-01-14 | Bosch Gmbh Robert | DRILLING HAMMER |
| DE19527117C2 (en) * | 1995-07-25 | 2000-05-31 | Metabowerke Kg | Hand drill with device for switching the operating modes "drilling" and "hammer drilling" |
| CA2390826C (en) * | 2002-06-17 | 2009-10-13 | Bob B. Ha | Hammer drill |
-
2006
- 2006-08-08 CA CA 2555533 patent/CA2555533A1/en not_active Abandoned
-
2007
- 2007-08-08 WO PCT/CA2007/001378 patent/WO2008017151A2/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11278971B2 (en) * | 2019-04-02 | 2022-03-22 | Daltron Forge (Pty) Ltd | Drill steel and its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008017151A3 (en) | 2008-05-08 |
| WO2008017151A2 (en) | 2008-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDC | Correction of dead application (reinstatement) | ||
| FZDE | Dead |