CA2555585A1 - Hammer-action attachment for use with a conventional electric drill - Google Patents
Hammer-action attachment for use with a conventional electric drill Download PDFInfo
- Publication number
- CA2555585A1 CA2555585A1 CA 2555585 CA2555585A CA2555585A1 CA 2555585 A1 CA2555585 A1 CA 2555585A1 CA 2555585 CA2555585 CA 2555585 CA 2555585 A CA2555585 A CA 2555585A CA 2555585 A1 CA2555585 A1 CA 2555585A1
- Authority
- CA
- Canada
- Prior art keywords
- hammer
- actuator mechanism
- action attachment
- main shaft
- drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- 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
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
- Drilling And Boring (AREA)
Abstract
A hammer-action attachment for use with an electric drill comprises a main shaft with an impact member mounted in longitudinal force transmitting relation on the main shaft for rotation therewith. An actuator mechanism is mounted on the main shaft for free rotation and for longitudinal sliding movement between a forwardly displaced position and a rearwardly displaced position. A drill engaging member is securely connected to the actuator mechanism and extends rearwardly to engage an electric drill. The drill engaging member biases the actuator mechanism into force transmitting engagement with the impact member, and precludes rotational movement about the longitudinal axis of the actuator mechanism with respect to the drill. Rotation of the main shaft and impact member causes the actuator mechanism to move in a reciprocating motion between the rearwardly displaced position and the forwardly displaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to drill attachments, and more particularly to drill attac2unenCs that cause a hammering action.
BACKGROUND OF THE INVENTIC)N
[0001] The present invention relates to drill attachments, and more particularly to drill attac2unenCs that cause a hammering action.
BACKGROUND OF THE INVENTIC)N
[0002] Hammer drills are well known and are typir_ally tlsed, even by hoine cz-afLstaeri, to drill holes in relatively hard substances, such as concrete and the like. Such hammer drills typically have a'rot'ating spindle that drives the drill chuck. A fixPd disc having a rearwardly facing toothed surface is secured to the rotations spindle. A movable disc having a forwardly facing toothed surface is selectively Qngageable with the rearwardly facing toothed surface of the- fixed disc so as to provide the ,. , hammer drill function. Although the apparatus does work, it presents a serious drawback in that the impact created by the engagement of the two toothed surfaces is diL=ecLed forwardly throuqh the drill bit and also back through the drill itself, as a reaction force. Accordingly, the bea.ri,ngs of the drill tend to wear excess.ivel y, which is highly undesirable. P'urthex, it is well known that there can be significant heat build with prior art hammer drills.
[0003] Such hammer drills, also known as percussion drills, can be found in for example United States Patent 2, 942, 852, issued June 28, 1960 to Muthman and United States Patent 5,653,294, issued August 5, 1997 to Thurler.
[0044] United States Patent 4,450,919, issued May 29, 1984 to Cousineau discloses a. drill attachri!ent for use with a conventi_onal el.ectric drill. This dri1l attachment provides a hammering and drilling acti,on so that a conventional drill may be used to drill into hard substances. The drill attachment c-omprizes 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 mounted in the front end thereof. The rotating spindle drives a drill chuck within the chuck assembly via the , ~. ,.
reciprocating spindle. A rotating c1u-L-ch plate mounted on the reciprocating spindle rotates w:i,th the reciprocating spindle.
Teeth on the rotating clutch plate engage cooperating teeth on the stationary clutch that is securely mounted on the case. A
removable 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. As is well known, the friction generated by the two sets of co-operating teeth frictionally engaging each other, i;, inefficient in terms of energy transfer and causes unnecessary heat buildup.
[0005] It is a further object of the preserit i.rxvention to prdvide a hammer drill bit chuck attachment.1 [0006] IL is yet a further object of the present invention to r= 9=
provide a hammer drill bit chuck attachment that is inexpensive to manufacture.
[0007] It is yet a further object of the present invention to provide a hammer drill bit chuck attacbzaent that is robust.
[,0008] . it is yet a further object of the present invention to provide a hammer drill bit chuck attachment wherein heat build up is minimized.
[0009] It is yet a further object of the present invention to provide a hammer drill bit chuck attachment whereiri an plec:tr. i c drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotatiQnal speeds.
[00010] It is yet a further object of the present invention to provide a hammer drill b.i.t chuck attachment that is operable without manual actuatiori in an operatively engaged position.
[00011] It is yet a further object of the present invention to provide a hammer drill bit chuck attachmen't wherein more power is available tio be transferred to a drill bit from an electric drill used in conjunction with the hammer drill bit chuck attachment.
SUMdKARY OF THE INVENTION
[00012] In accordance with one aspect of the present invention there is disclosed a novel hammer-action attachment for use with a ~ e conventional electric drill. The hammer-action attachment comprises,.a mairi shaft having a forward drila. chuck end po 'rtion and a rearward shank portion, and defines a longitudinal axis. An impact member is sectire.ly mounted in longitudinal force transmitting relatiori on L'he main shaft for rotation therewith about the Iongitudirial axis. An actuator mechanism is mounted on the main shaft for free rotation of the main shaft with respect to the actuator m.echanism and for longitudinal sliding movement of the actuator mecharii5m along the main shaft between a forwardly displaced position and a rearwardly displaced position. A drill engaging member is securely connected to the actuator mechanism and extends rearwardly from the actuator mechanism for engagement with the electric drill. The drill engaging member biases the actuator mechanism into force transrcmitting engagement with the impact member, and precludes rotatidnal movement about the longitudinal axis of the actuator mechanism with respect to the electric drill.
Kotati.on of the main ~haft and impact member about the longitudikal axis wtien the actuator mechanism is biased into force transmitting engagement with the impact member, causes the acLuator mechanism to move in a reciprocating motion bPt_ween the forwardly displaced position and the rearwardly d%splaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
[00013] Qther advantages, features and characterisLics of the present invention, as welcl as methods of operation and functions of.
the related elemenLs 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 is briefly described herein below.
[0044] United States Patent 4,450,919, issued May 29, 1984 to Cousineau discloses a. drill attachri!ent for use with a conventi_onal el.ectric drill. This dri1l attachment provides a hammering and drilling acti,on so that a conventional drill may be used to drill into hard substances. The drill attachment c-omprizes 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 mounted in the front end thereof. The rotating spindle drives a drill chuck within the chuck assembly via the , ~. ,.
reciprocating spindle. A rotating c1u-L-ch plate mounted on the reciprocating spindle rotates w:i,th the reciprocating spindle.
Teeth on the rotating clutch plate engage cooperating teeth on the stationary clutch that is securely mounted on the case. A
removable 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. As is well known, the friction generated by the two sets of co-operating teeth frictionally engaging each other, i;, inefficient in terms of energy transfer and causes unnecessary heat buildup.
[0005] It is a further object of the preserit i.rxvention to prdvide a hammer drill bit chuck attachment.1 [0006] IL is yet a further object of the present invention to r= 9=
provide a hammer drill bit chuck attachment that is inexpensive to manufacture.
[0007] It is yet a further object of the present invention to provide a hammer drill bit chuck attacbzaent that is robust.
[,0008] . it is yet a further object of the present invention to provide a hammer drill bit chuck attachment wherein heat build up is minimized.
[0009] It is yet a further object of the present invention to provide a hammer drill bit chuck attachment whereiri an plec:tr. i c drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotatiQnal speeds.
[00010] It is yet a further object of the present invention to provide a hammer drill b.i.t chuck attachment that is operable without manual actuatiori in an operatively engaged position.
[00011] It is yet a further object of the present invention to provide a hammer drill bit chuck attachmen't wherein more power is available tio be transferred to a drill bit from an electric drill used in conjunction with the hammer drill bit chuck attachment.
SUMdKARY OF THE INVENTION
[00012] In accordance with one aspect of the present invention there is disclosed a novel hammer-action attachment for use with a ~ e conventional electric drill. The hammer-action attachment comprises,.a mairi shaft having a forward drila. chuck end po 'rtion and a rearward shank portion, and defines a longitudinal axis. An impact member is sectire.ly mounted in longitudinal force transmitting relatiori on L'he main shaft for rotation therewith about the Iongitudirial axis. An actuator mechanism is mounted on the main shaft for free rotation of the main shaft with respect to the actuator m.echanism and for longitudinal sliding movement of the actuator mecharii5m along the main shaft between a forwardly displaced position and a rearwardly displaced position. A drill engaging member is securely connected to the actuator mechanism and extends rearwardly from the actuator mechanism for engagement with the electric drill. The drill engaging member biases the actuator mechanism into force transrcmitting engagement with the impact member, and precludes rotatidnal movement about the longitudinal axis of the actuator mechanism with respect to the electric drill.
Kotati.on of the main ~haft and impact member about the longitudikal axis wtien the actuator mechanism is biased into force transmitting engagement with the impact member, causes the acLuator mechanism to move in a reciprocating motion bPt_ween the forwardly displaced position and the rearwardly d%splaced position, and transmits impact forces forwardly along the longitudinal axis to the main shaft.
[00013] Qther advantages, features and characterisLics of the present invention, as welcl as methods of operation and functions of.
the related elemenLs 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 is briefly described herein below.
BRIEF DESCRIPTION OF THE DRAWINGS
[00014] The novel features whi.ch are believed to be characteristic of the hammer-action attachment for use with a coriveriLional electric drill according to the present invention, as Lo its structure, ozganization, use and method of operation, together with further objectives and advantages thereof, will be better understood from the .f.ol~owi,ng drawings in which a presently preferred embodiment of k.he invention wi],l now be illustrated by way of example. It is expressly understood, however, that the drawings are for the purpose of illustration and description only, and are not intended as a definition of the limits of the inventian. In the accompanyinq drawings:
[00015] Figure 1 is a perspective view of the first preferred ~. ,.
embodiment of the hammer-action attachment for uae with a conventional electrir. drill,according to the present invention;
[000161 Figure 2 is a top plan view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00014] The novel features whi.ch are believed to be characteristic of the hammer-action attachment for use with a coriveriLional electric drill according to the present invention, as Lo its structure, ozganization, use and method of operation, together with further objectives and advantages thereof, will be better understood from the .f.ol~owi,ng drawings in which a presently preferred embodiment of k.he invention wi],l now be illustrated by way of example. It is expressly understood, however, that the drawings are for the purpose of illustration and description only, and are not intended as a definition of the limits of the inventian. In the accompanyinq drawings:
[00015] Figure 1 is a perspective view of the first preferred ~. ,.
embodiment of the hammer-action attachment for uae with a conventional electrir. drill,according to the present invention;
[000161 Figure 2 is a top plan view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00017] Figure 3 is a side elevational view of the first preferred embodiment hammer-actiorl attachment for use with a conventional electric drill of Figure 1;
[00018] Figure 4 is a frotiL end view of the first preferred embodiment hammer-actioti attachment for use with a conventional electric drill of Figure 1;
[00019] Figure 5 is a back end view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00020] Figure 6 is a partly exploded perspecLive view of the first preferred embodiment hammer-action attachment for use with a convpntiona7 electric drill of Figure 1;
[60021] Figure 7 is a sectional side elevational view of the fi.r..st preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure,.l, taken along section line 7-7 of Figure 4;
[00022] Figure 8 is a secLional top plan view of the firsL
preferred embodiment hammer-action attac,hment for use with a conventional electric drill of Figure 1, taken along section line e-~3 of Figure 4;
[00023] Figure 9 is a partly exploded perspective view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, with the plastic overmold removed for the sake of clarity;
c [00024] Figure 10 is a side elevational of the first preferred emPodiment hammer-action attachment for use with a conventional eleGtric dri.l], of Figure 1, with the p].astic overmold removed for the sake of clarity;
[00025] Figure 11 is a perspective view of the plastic overmold used in the first preferred embodiment hammer-action attachment for use with a conventiorial electric drill of Figure 1;
[000261 Figure 12 is a side elevational of the plastic overmold used in the first preferred embodiment hammer-action attachment for use w.i.th a conventional electric drill of Figure 1;
[00027] Figure 13 is a sectional side elevational of the plastic overmold used in the first preferred embodiment hartutzer-action attachment for use with a conventional electric dr.ill of Fiqure 1, taken along section line 13-13 of Figure 11;
(000281 Figure 14 is a perspective view of the locking collar used in the first preferred embodiment hamme.r-action attachment for use with a conventional electric drill of Figure 1;
[00029] Figur= 15 is a perspective view of the dri'll engagi.ng member used in Lhe first preferred embodiment hammer-action attachment for use with a conventional electric drill. of Figure 1;
[00030] Figure 16 is a side elevational view of l:he drill engaging member used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00031] Figuxe 17 is a sectional side el.evational. view~ of the drill engaging member used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figurc 1, taken along section line 17-17 of Figure 15;
[00032] Figure 18 is a sectional top plan view of tho drill engaging member used in Lhe first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00033] Figure 19 is a perspective view of the impact member used in the first preferred embodiment hammer-action attachment for use with a conventi_onal electric drill of Figure 1;
[00034] Figure 20 i.'s a perspective view of the drill engagi,ng member used in the first preterred embodiment hammer-action attachment for use with a conventional electric dril3, of Figure 1;
[000351 Figure 21 is a back end, elevational view of the drill engagi.ng member used in the first preferred embodiment hammer-action attachment for use with a conventional el.ectric: drill of Figure 1;
[00036] Figure 22õ is a i-sectional side elevational view of.. the drill engaging member used in the First preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, taken along section line 22-22 of F'igure 21;
[00037] Figure 23 is a perspective view of the substantia.]1.y cylindrical core of the actuator mechanism used in the first preferred embodiment hammer-aetion attachment for use wiGh a conventional electric drill of Figure 1;
[00038] Figure 24 is a side elevational view of the subsf;dnti.ally cylindrical core of the actuator mechanisza used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00039] Figure 25 is a perspective view of the -cntact rinq of the actuator mechanism used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00040] Figure 26 is a perspective view of the main shaft of the actuator mechanism used in the first preferred embodzment hammer-action attachment for use with a convenkionaJ. electric drill of Figure 1;
1000411 Figure 27 i.s a side elevational view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, with the actuator mechanism in an forwardly c3isplaced position;
[00018] Figure 4 is a frotiL end view of the first preferred embodiment hammer-actioti attachment for use with a conventional electric drill of Figure 1;
[00019] Figure 5 is a back end view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00020] Figure 6 is a partly exploded perspecLive view of the first preferred embodiment hammer-action attachment for use with a convpntiona7 electric drill of Figure 1;
[60021] Figure 7 is a sectional side elevational view of the fi.r..st preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure,.l, taken along section line 7-7 of Figure 4;
[00022] Figure 8 is a secLional top plan view of the firsL
preferred embodiment hammer-action attac,hment for use with a conventional electric drill of Figure 1, taken along section line e-~3 of Figure 4;
[00023] Figure 9 is a partly exploded perspective view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, with the plastic overmold removed for the sake of clarity;
c [00024] Figure 10 is a side elevational of the first preferred emPodiment hammer-action attachment for use with a conventional eleGtric dri.l], of Figure 1, with the p].astic overmold removed for the sake of clarity;
[00025] Figure 11 is a perspective view of the plastic overmold used in the first preferred embodiment hammer-action attachment for use with a conventiorial electric drill of Figure 1;
[000261 Figure 12 is a side elevational of the plastic overmold used in the first preferred embodiment hammer-action attachment for use w.i.th a conventional electric drill of Figure 1;
[00027] Figure 13 is a sectional side elevational of the plastic overmold used in the first preferred embodiment hartutzer-action attachment for use with a conventional electric dr.ill of Fiqure 1, taken along section line 13-13 of Figure 11;
(000281 Figure 14 is a perspective view of the locking collar used in the first preferred embodiment hamme.r-action attachment for use with a conventional electric drill of Figure 1;
[00029] Figur= 15 is a perspective view of the dri'll engagi.ng member used in Lhe first preferred embodiment hammer-action attachment for use with a conventional electric drill. of Figure 1;
[00030] Figure 16 is a side elevational view of l:he drill engaging member used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00031] Figuxe 17 is a sectional side el.evational. view~ of the drill engaging member used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figurc 1, taken along section line 17-17 of Figure 15;
[00032] Figure 18 is a sectional top plan view of tho drill engaging member used in Lhe first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00033] Figure 19 is a perspective view of the impact member used in the first preferred embodiment hammer-action attachment for use with a conventi_onal electric drill of Figure 1;
[00034] Figure 20 i.'s a perspective view of the drill engagi,ng member used in the first preterred embodiment hammer-action attachment for use with a conventional electric dril3, of Figure 1;
[000351 Figure 21 is a back end, elevational view of the drill engagi.ng member used in the first preferred embodiment hammer-action attachment for use with a conventional el.ectric: drill of Figure 1;
[00036] Figure 22õ is a i-sectional side elevational view of.. the drill engaging member used in the First preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, taken along section line 22-22 of F'igure 21;
[00037] Figure 23 is a perspective view of the substantia.]1.y cylindrical core of the actuator mechanism used in the first preferred embodiment hammer-aetion attachment for use wiGh a conventional electric drill of Figure 1;
[00038] Figure 24 is a side elevational view of the subsf;dnti.ally cylindrical core of the actuator mechanisza used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00039] Figure 25 is a perspective view of the -cntact rinq of the actuator mechanism used in the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1;
[00040] Figure 26 is a perspective view of the main shaft of the actuator mechanism used in the first preferred embodzment hammer-action attachment for use with a convenkionaJ. electric drill of Figure 1;
1000411 Figure 27 i.s a side elevational view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, with the actuator mechanism in an forwardly c3isplaced position;
[00042] Figure 28 is a side elevat;ional view of the first preferred embodiment hammer-action attachment for use with a conventional electric drill of Figure 1, with the actuator mechanism in a rearwardly displaced position;
[00043] Figure 29 is a perspective view of the second preferred embodiment of the hammer-act.i.on attachment for use with a conventional electric drill according to the present invention;
[00044] Figure 30 is a sectional top plan view of the second preferred embodiment of the hammer-action attacrunent for use with a conventional electric drill of Figure 29, taken along section line 30-30 of Figure 29;
[00045] Figure 31 is a sectional side elevational view of the second preferred embodiment of the hammer-action attachment for use with a conventional electric drill of Figiire 29, taken along section line 31-31 of L'igure 29;
[00046] Figure 32 is a front end view of the second preferred embodimenl; of the hammer-action attachment for use with a conventional electric drill of Figure 29;
[00043] Figure 29 is a perspective view of the second preferred embodiment of the hammer-act.i.on attachment for use with a conventional electric drill according to the present invention;
[00044] Figure 30 is a sectional top plan view of the second preferred embodiment of the hammer-action attacrunent for use with a conventional electric drill of Figure 29, taken along section line 30-30 of Figure 29;
[00045] Figure 31 is a sectional side elevational view of the second preferred embodiment of the hammer-action attachment for use with a conventional electric drill of Figiire 29, taken along section line 31-31 of L'igure 29;
[00046] Figure 32 is a front end view of the second preferred embodimenl; of the hammer-action attachment for use with a conventional electric drill of Figure 29;
(00047} Figure 33 is a perspective view from the back of the handle m.ember used in the second preferred embodiment of the hammer-action attachment for use with a conventional electric drill of Figure 29;
[00048] Figure 34 is a sectional top plan view of the handle member used in the second preferred embodiment of the hammer-action attactiinent for use with a conventional electric drill according to the present inventiorl, taken aJ.ong section line 34-34 of F'igure 33;
and, [00049] Figure 35 is a sectional side elevata,onal view of the handle member used in the second preferred embodiment of the hammer-action attachment for use with a conventional electric drill of Figure 29, taken along section line 35-35 of Figure 33.
,. .
DETAILED DESCRIPTION OF TTIE PREFERRED EMBODIMENTS
(00050] Referring to Figures 1 through 35 of the drawings, it will be noted that Figures Z through 28 illustrate a first preferred einbodiinent csf the hammer-action attachment for use with a conventional electric drill of Ltie present invention, and Figures 29 through 35 illustraLe a second preferred embodiment of the hammer-action attactunent for use with a conventional electric drill of the present invention.
[00051] Reference will now be made to Figures 1 through 28, which show a preferred embodiment of the hammer-action attachment for use with a conventional electric drill of the pr=esent invention, as indicated by general r-elerence numeral 20, for use with a conventional e7ectric drill 28 (shown in Figures 27 and'28).
[00052] The hammer-action attachment for use with a conventional electric drill 20 comprises a main shaft. 30 having a forward drill chuck end portion 33 and a rearward shank portion 34 that is preferably hexagonal in cross-section. The main shaft 30 defines a longitudinal axis "L" about which the main shaft 30 rotates.
[00053] A conventional drill bit chuck 35 is mountabl.e on the forward dril.l chuck eiid portion 33 of the main shaft 30 for rotatiori therewith, and comprises three movable jaw members 36 that receive and retain a conventional drill bit 29 therein. The drill ,. ,.
bit chuck 35 has a threaded bore hole 39a that receives the co-operating threaded forward drill chuck end portion 33 in secure engagement. Fundamentally, the hammer drill bit chuck attachment 20 comprises a main shaft 30, an impact member 40, an actuator mechanism 50, and a drill engaging member 70, as will be described in greaLer detail below.
[00054] The impact member 40 is securely mounted in fixed relation on the main shaft 30, so as to be in longitudinal force transmitting relation, for rotation therewith about the longituCinal axis "L". The impact member 40 has a rearwardly facing impact surface 42 that in the first preferred en-bodiment as illustrate comprises a plurality of teeth 44. Other types and shapes of impact surfaces have also been found to be suitable..
[00055] The actuator mechanism 50 is mounted on the main shaft 30 for free rotation of the main shaft 30 with respect to the actuator mechanism 50 and for longitudirial sliding movement of acLuator mechanism 50 along the main shatt 30 between a forwardly displaced position, as can be best seen in Figure 27, and a rearwardly displaced position, õas can be best seen in Figure 28. A roller bearing 57 disposed aL the rear of the substantially cylindrical core 53 ensures a cl.ose but non-binding fit ori the rearward shank portion 34 of the main shaft 30. The actuator mechanism 50 engages the impact surface 42 of the impact member 40 when the actuator mechanism 50 is in its forwardly displaced posi,tion.
[00048] Figure 34 is a sectional top plan view of the handle member used in the second preferred embodiment of the hammer-action attactiinent for use with a conventional electric drill according to the present inventiorl, taken aJ.ong section line 34-34 of F'igure 33;
and, [00049] Figure 35 is a sectional side elevata,onal view of the handle member used in the second preferred embodiment of the hammer-action attachment for use with a conventional electric drill of Figure 29, taken along section line 35-35 of Figure 33.
,. .
DETAILED DESCRIPTION OF TTIE PREFERRED EMBODIMENTS
(00050] Referring to Figures 1 through 35 of the drawings, it will be noted that Figures Z through 28 illustrate a first preferred einbodiinent csf the hammer-action attachment for use with a conventional electric drill of Ltie present invention, and Figures 29 through 35 illustraLe a second preferred embodiment of the hammer-action attactunent for use with a conventional electric drill of the present invention.
[00051] Reference will now be made to Figures 1 through 28, which show a preferred embodiment of the hammer-action attachment for use with a conventional electric drill of the pr=esent invention, as indicated by general r-elerence numeral 20, for use with a conventional e7ectric drill 28 (shown in Figures 27 and'28).
[00052] The hammer-action attachment for use with a conventional electric drill 20 comprises a main shaft. 30 having a forward drill chuck end portion 33 and a rearward shank portion 34 that is preferably hexagonal in cross-section. The main shaft 30 defines a longitudinal axis "L" about which the main shaft 30 rotates.
[00053] A conventional drill bit chuck 35 is mountabl.e on the forward dril.l chuck eiid portion 33 of the main shaft 30 for rotatiori therewith, and comprises three movable jaw members 36 that receive and retain a conventional drill bit 29 therein. The drill ,. ,.
bit chuck 35 has a threaded bore hole 39a that receives the co-operating threaded forward drill chuck end portion 33 in secure engagement. Fundamentally, the hammer drill bit chuck attachment 20 comprises a main shaft 30, an impact member 40, an actuator mechanism 50, and a drill engaging member 70, as will be described in greaLer detail below.
[00054] The impact member 40 is securely mounted in fixed relation on the main shaft 30, so as to be in longitudinal force transmitting relation, for rotation therewith about the longituCinal axis "L". The impact member 40 has a rearwardly facing impact surface 42 that in the first preferred en-bodiment as illustrate comprises a plurality of teeth 44. Other types and shapes of impact surfaces have also been found to be suitable..
[00055] The actuator mechanism 50 is mounted on the main shaft 30 for free rotation of the main shaft 30 with respect to the actuator mechanism 50 and for longitudirial sliding movement of acLuator mechanism 50 along the main shatt 30 between a forwardly displaced position, as can be best seen in Figure 27, and a rearwardly displaced position, õas can be best seen in Figure 28. A roller bearing 57 disposed aL the rear of the substantially cylindrical core 53 ensures a cl.ose but non-binding fit ori the rearward shank portion 34 of the main shaft 30. The actuator mechanism 50 engages the impact surface 42 of the impact member 40 when the actuator mechanism 50 is in its forwardly displaced posi,tion.
[00056] The actuator mechanism is retained on the rearward shank portion 34 of the main shaft 30 by means of a G"-cl.ip 58 securely engaged 3,n an annulax= slot 36 in the rearward shank portion 34.
[00057] The actuator mechanism 50 has at least one roller member 52 freely rotatably mounted thereon by means of suitable threaded fasteners 52a, and in the first preferred embodiment as illustrated, the at least one roller member. 52 comprises three roller members 52, each freely rotatably mounted on the actuator mechanism 50. Preferably ..the three roller members 52 are substantially equally radially spaced around the actuator mechanism 50, and around the longitudinal axis "L". When the actuator mechanism 50 is bi.ased. in to forced transmitting cngagement with the impact member 40, by the drill engaging member 70, the three roller members S. are in force transmitting engagement with the ~. .
impact surface 42 of the impact member 40, as the mai.n shaft 30 rotates with respect to the actuator mechanism 52. }
[00058] The actuator mechani.sm. 50 comprises a substantially cy].indrical main body member 54 that preferably coiaprises a plastic overmold 51 molded over a substantially cylindrical core 53. The aubstantial],y cylindrical main body member 54, and specifically the plastic overmold 51, has a male-threa.ded exterior surface 55.
[00057] The actuator mechanism 50 has at least one roller member 52 freely rotatably mounted thereon by means of suitable threaded fasteners 52a, and in the first preferred embodiment as illustrated, the at least one roller member. 52 comprises three roller members 52, each freely rotatably mounted on the actuator mechanism 50. Preferably ..the three roller members 52 are substantially equally radially spaced around the actuator mechanism 50, and around the longitudinal axis "L". When the actuator mechanism 50 is bi.ased. in to forced transmitting cngagement with the impact member 40, by the drill engaging member 70, the three roller members S. are in force transmitting engagement with the ~. .
impact surface 42 of the impact member 40, as the mai.n shaft 30 rotates with respect to the actuator mechanism 52. }
[00058] The actuator mechani.sm. 50 comprises a substantially cy].indrical main body member 54 that preferably coiaprises a plastic overmold 51 molded over a substantially cylindrical core 53. The aubstantial],y cylindrical main body member 54, and specifically the plastic overmold 51, has a male-threa.ded exterior surface 55.
[000591 The plastic overmold 51 also has a forwardly extending annular portion 51a. The three roll.er members 52 of the actuator mechanism 50 are covprPd by the forwardly extending annular poz=t:ion 51. As can be seen in the figures, when the actuator mechanism 50 in its forwardly displaced position, rhe .rol,].er members 52 engage the impact surface 42 of the impac;L member 40, as the main shaft rotates with respec:t to the actuator mechanism 50.
[00060] The hammer-action attachmerit 20 further comprises a drive collar 60 having a throughpassage 62.. The drive collar 60 is connected in freely slidable relation to the actuator member 50, to permit longitudinal movement of Lhe actuator member 50 on the rearward shank portion 34 of the main shaft 30. The drive collar 60 extends rearwardly from the actuaLor member 50 to receive the rearward shank portion of 34 of the main shaft 30 in the throughpassage 62. 'I'he drive collar 60 is hexagonal in cross section so that it can be gripped more securely in the chuck 23 of the electric drill 22, which is cspecially a.mportanL in an electric drill havi.ng a keyless chuck. Further, thP throughpassage 62 is hexagonal in cross-section so that is does not rotate around the rearward shank portion 34 of the main shafL, and thereby can transmit rotational force from the electric drill 22 to the main shaft 30.
[00060] The hammer-action attachmerit 20 further comprises a drive collar 60 having a throughpassage 62.. The drive collar 60 is connected in freely slidable relation to the actuator member 50, to permit longitudinal movement of Lhe actuator member 50 on the rearward shank portion 34 of the main shaft 30. The drive collar 60 extends rearwardly from the actuaLor member 50 to receive the rearward shank portion of 34 of the main shaft 30 in the throughpassage 62. 'I'he drive collar 60 is hexagonal in cross section so that it can be gripped more securely in the chuck 23 of the electric drill 22, which is cspecially a.mportanL in an electric drill havi.ng a keyless chuck. Further, thP throughpassage 62 is hexagonal in cross-section so that is does not rotate around the rearward shank portion 34 of the main shafL, and thereby can transmit rotational force from the electric drill 22 to the main shaft 30.
[00061] The first preferred embodiment hammer-action attachmerit 20 also comprises a drill engaging member 70 securely connected to the actuator mer.hanism 50. The drill engaging member 70 extends rearwardly from the actuator mechanism SO for engagement wiCh the electric drill 22. The drill engaging member 70 biases the actuator mechanism 50 in to force transmitting engagement with the impact surface 42 of the impact member 40, and precludes rotational movement about the longitudinal axis "L" of the actuator mechanism 50 with respect to the electric drill 22.
,. , [00062] The drill engaging member 70 comprises a front collar 72, a rear collar 74, a first ariti member 71 and a second arm member 72.
The first and second arm member 73., 72 extend between the frorit collar 73 and the rear collar 74. The first and second arm mQmber.
71., 72 are longitudinally flexible, so as to provide for the bia5ing action of the drill engaging member 70, and are preferably made from ABS plastic (acrylonitrile butadiene styrene).
[00063] The front collar 73 of the drill engaging member 70 has a cooperating female threaded interior surface 77 that threadibly engages the male threaded exterior surface 55 of the substantially cylindrical main body member 54, thereby permitting the front collar 73 of the drill engaging member 70 to be longitudinally adjustable on the substantially cylindrical main body member 54 of - 18 -, the actuator mechanism 50. In this manner, the overall length of the first preferred embodiment hammer-action attachment 20 is adjustable, to accommodate various sizes and shapes of conventional electric drills.
[00064] '1'he hammer-action attactunent 20 further comprises a locking collar 78 having a co-operating female-threaded interior surface 79 that threadibly engages the male-threadeci exterior surface 55 of the substantially cylindrical main body member 54 of the actzaator mechanism 50. The locking collar 78 is rotated to abut txgainsL the front collar 73 of the drill engaging member 70, to t,hereby lock the drill Gngaging member 70 in place on the substantially cylindrical main body member 54 of the actuator mechani,sm 50.
[00065] The rear collar 74 of the drill engaging member 70 has a high friction surface 75 at its back and, to preclude slippage w,ith respect to the electric drill 22. The high friction surface 75 is part of a high friction ring member 76 that is preferably made from poly vinyl chloride.
[00066] xotation of the main shaft 30 and the impact member 40 about the longitudinal axis "L", when the actuator mechanism is biased in to force transmitting engagement with Lhe impact member - 1.9 -40 by the drill engaging member 70, causes the actuator mechanism 50 to move in a reciprocating motion between its fo.r,wardiy displaced position and its rearwardly displaced position, and Lransmits impact forces forwardly along the longitudinal axis "L"
to the main shaft 30, thereby providing a hammer-action to the drill bit 29 in the chuck 35.
[000671 Reference will how be made to Figures 29 through 35, which show a second preferred embodiment of the present inventian.
In the second preferred embodiment, indicated by the general reference numera3. 220, the hammer-action attachment 220 comprises a hand gripped 270 having an inLernal threaded passage way 272 that threadibly engages the male-threaded exterior surface 55 of the substantially cylindrical main body member 54 of the actuator mcchanism. This h.and grip 270 permits manual manipulation of the actuator 50 in to engagement with the impact mHmber 40, and might be used when it is desirable to select between a hammer drilling.
~ ~.
-iction and a conventional drilling action.
(000681 It can readily,be seen that the hammer-action attachment for use wiLh a conventional electric drill, according to the preserit: invention, permits a conventional electric drill to function as a hammer drill, when the hammer-action attachment is used with a conventional electric drill. It has been found that using the combination of the hammer-action attachment according to the present invention with a conventional electric drill, holes can be drilled into masonry and the like even Faster than with most hammer drills, evezi those costing several hundred dollars.
[00069] Further, it has been found that with the hammer drill bit chuck attachment 20 of the present invention, there is reduced friction, reduced heat build up, reduced wear and improved dri.].1.ing performance compared with conventional hammer drills, which have two sets of impacting steel teeth used to perform the hammering function_ Heat build up is of particular concern under IEC
60745-1:2001, as adopted by UL, CSA and other natiorial governing bodies regulating safety in hand held power tools and accessories.
pn electric drill using the present invention experiences very minimal 1055 of spcod due to the reduced Lriction between the roller members bz and the impact meamb.er 40. Accordingly, the rotational energy is directed to the actual longitudinal vibration, and not to losses due to friction and heat. This is important for being able to achieve the maximtun poss.ib].e speed with a drill, and also for reduced wear of the hammer drill bit chuck attachment of the present invention and art 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 ~riction of the steel teeth.
[00070] As can be understood from the above description and from the accompanying drawings, thc present invention provides a hammer-action attachment for use with a conventional electric drill 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, whereiri an electric drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotational. speeds, and whexel,n more power is available to be transferred to a drill bit from an electric drill used in conjunction with the hammer drill bit chuck attachmpnt, all of which features are unknowri in the prior art.
[00071) Other variations of the above principles will be apparent to those who are kriowledgeable in the ficld. of the invention, arid such variations are considered to be within the scope of the present invention. I'urther, othe-r znodificatior:s and alterations may be used in the desiqn 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.
,. , [00062] The drill engaging member 70 comprises a front collar 72, a rear collar 74, a first ariti member 71 and a second arm member 72.
The first and second arm member 73., 72 extend between the frorit collar 73 and the rear collar 74. The first and second arm mQmber.
71., 72 are longitudinally flexible, so as to provide for the bia5ing action of the drill engaging member 70, and are preferably made from ABS plastic (acrylonitrile butadiene styrene).
[00063] The front collar 73 of the drill engaging member 70 has a cooperating female threaded interior surface 77 that threadibly engages the male threaded exterior surface 55 of the substantially cylindrical main body member 54, thereby permitting the front collar 73 of the drill engaging member 70 to be longitudinally adjustable on the substantially cylindrical main body member 54 of - 18 -, the actuator mechanism 50. In this manner, the overall length of the first preferred embodiment hammer-action attachment 20 is adjustable, to accommodate various sizes and shapes of conventional electric drills.
[00064] '1'he hammer-action attactunent 20 further comprises a locking collar 78 having a co-operating female-threaded interior surface 79 that threadibly engages the male-threadeci exterior surface 55 of the substantially cylindrical main body member 54 of the actzaator mechanism 50. The locking collar 78 is rotated to abut txgainsL the front collar 73 of the drill engaging member 70, to t,hereby lock the drill Gngaging member 70 in place on the substantially cylindrical main body member 54 of the actuator mechani,sm 50.
[00065] The rear collar 74 of the drill engaging member 70 has a high friction surface 75 at its back and, to preclude slippage w,ith respect to the electric drill 22. The high friction surface 75 is part of a high friction ring member 76 that is preferably made from poly vinyl chloride.
[00066] xotation of the main shaft 30 and the impact member 40 about the longitudinal axis "L", when the actuator mechanism is biased in to force transmitting engagement with Lhe impact member - 1.9 -40 by the drill engaging member 70, causes the actuator mechanism 50 to move in a reciprocating motion between its fo.r,wardiy displaced position and its rearwardly displaced position, and Lransmits impact forces forwardly along the longitudinal axis "L"
to the main shaft 30, thereby providing a hammer-action to the drill bit 29 in the chuck 35.
[000671 Reference will how be made to Figures 29 through 35, which show a second preferred embodiment of the present inventian.
In the second preferred embodiment, indicated by the general reference numera3. 220, the hammer-action attachment 220 comprises a hand gripped 270 having an inLernal threaded passage way 272 that threadibly engages the male-threaded exterior surface 55 of the substantially cylindrical main body member 54 of the actuator mcchanism. This h.and grip 270 permits manual manipulation of the actuator 50 in to engagement with the impact mHmber 40, and might be used when it is desirable to select between a hammer drilling.
~ ~.
-iction and a conventional drilling action.
(000681 It can readily,be seen that the hammer-action attachment for use wiLh a conventional electric drill, according to the preserit: invention, permits a conventional electric drill to function as a hammer drill, when the hammer-action attachment is used with a conventional electric drill. It has been found that using the combination of the hammer-action attachment according to the present invention with a conventional electric drill, holes can be drilled into masonry and the like even Faster than with most hammer drills, evezi those costing several hundred dollars.
[00069] Further, it has been found that with the hammer drill bit chuck attachment 20 of the present invention, there is reduced friction, reduced heat build up, reduced wear and improved dri.].1.ing performance compared with conventional hammer drills, which have two sets of impacting steel teeth used to perform the hammering function_ Heat build up is of particular concern under IEC
60745-1:2001, as adopted by UL, CSA and other natiorial governing bodies regulating safety in hand held power tools and accessories.
pn electric drill using the present invention experiences very minimal 1055 of spcod due to the reduced Lriction between the roller members bz and the impact meamb.er 40. Accordingly, the rotational energy is directed to the actual longitudinal vibration, and not to losses due to friction and heat. This is important for being able to achieve the maximtun poss.ib].e speed with a drill, and also for reduced wear of the hammer drill bit chuck attachment of the present invention and art 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 ~riction of the steel teeth.
[00070] As can be understood from the above description and from the accompanying drawings, thc present invention provides a hammer-action attachment for use with a conventional electric drill 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, whereiri an electric drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotational. speeds, and whexel,n more power is available to be transferred to a drill bit from an electric drill used in conjunction with the hammer drill bit chuck attachmpnt, all of which features are unknowri in the prior art.
[00071) Other variations of the above principles will be apparent to those who are kriowledgeable in the ficld. of the invention, arid such variations are considered to be within the scope of the present invention. I'urther, othe-r znodificatior:s and alterations may be used in the desiqn 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 (24)
1. A hammer-action attachment for use with a conventional electric drill, said hammer-action attachment comprising:
a main shaft having a forward drill chuck end portion and a rearward shank portion, arid defining a longitudinal axis;
an impact member securely mounted in longitudinal force transmitting relation on said main shaft for rotation therewith about said longitudinal axis;
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; and, a drill engaging member securely connected to said actuator mechanism and extending rearwardly from said actuator mechanism for engagement with said electric drill, wherein said drill engaging member biases said actuator mechanism into force transmitting engagement with said impact member, and precludes rotational movement about said longitudinal axis of said actuator mechanism with respect to said electric drill;
wherein rotation of said main shaft and impact member about said longitudinal axis when said actuator mechanism is biased into 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, arid defining a longitudinal axis;
an impact member securely mounted in longitudinal force transmitting relation on said main shaft for rotation therewith about said longitudinal axis;
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; and, a drill engaging member securely connected to said actuator mechanism and extending rearwardly from said actuator mechanism for engagement with said electric drill, wherein said drill engaging member biases said actuator mechanism into force transmitting engagement with said impact member, and precludes rotational movement about said longitudinal axis of said actuator mechanism with respect to said electric drill;
wherein rotation of said main shaft and impact member about said longitudinal axis when said actuator mechanism is biased into 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-action attachment of claim 1, wherein said actuator mechanism has at least one roller member freely rotatably mounted thereon, and wherein when said actuator mechanism is biased into said force transmitting engagement with said impact member, said at least one roller member is in said force transmitting engagement with said impact member as said main shaft rotates with respect to said actuator mechanism.
3. The hammer-action attachment of claim 1, wherein said impact member is mounted in fixed relation on said main shaft for rotation therewith.
4. The hammer-action attachment of claim 3, wherein said impact member has an impact surface, and said actuator mechanism engages said impact surface when said actuator mechanism is in said forwardly displaced position.
5. The hammer-action attachment of claim 4, wherein said impact surface is rearwardly facing.
6. The hammer-action attachment of claim 5, wherein said impact surface comprises a plurality of teeth.
7. The hammer-action attachment of claim 6, wherein said actuator mechanism has at least one roller member freely rotatably mounted thereon, and wherein when said actuator mechanism is biased into said force transmitting engagement with said impact member, said at least one roller member is in said force transmitting engagement with said impact surface as said main shaft rotates with respect to said actuator mechanism.
8. The hammer-action attachment of claim 7, wherein said at least one roller member comprises three roller members, each freely rotatably mounted on said actuator mechanism.
9. The hammer-action attachment of claim 8, wherein said three roller members are substantially equally radially spaced around said actuator mechanism.
10. The hammer-action attachment of claim 7, wherein, when said actuator mechanism is in rearwardly displaced position, said at least one roller member is removed from said engagement with said impact surface.
11. The hammer-action attachment of claim 1, wherein said rearward shank portion is hexagonal in cross-section.
12. The hammer-action attachment of claim 11, further comprising a drive collar having a throughpassage, wherein said drive collar is connected in freely slidable relation to said actuator member and extends rearwardly therefrom to receive said rearward shank portion of said main shaft in said throughpassage.
13. The hammer-action attachment of claim 12, wherein said drive collar is hexagonal in cross-section and said throughpassage is hexagonal in cross-section.
14. The hammer-action 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.
15. The hammer-action attachment of claim 1, wherein said drill engaging member comprises a front collar, a rear collar, and first and second arm members extending between said front collar and said rear collar.
16. The hammer-action attachment of claim 15, wherein said rear collar has a high-friction surface at its back end.
17. The hammer-action attachment of claim 16, wherein said high-friction surface is part of a high-friction ring member.
18. The hammer-action attachment of claim 17, wherein said high-friction ring member is made from polyvinyl chloride.
19. The hammer-action attachment of claim 15, wherein said actuator mechanism comprises a substantially cylindrical main body member having a male-threaded exterior surface, and said front collar of said drill engaging member has a co-operating female-threaded interior surface that threadibly engages said male-threaded exterior surface, thereby permitting said front collar to be longitudinally adjustable on said substantially cylindrical main body member of said actuator mechanism.
20. The hammer-action attachment of claim 19, further comprising a locking collar having a co-operating female-threaded interior surface that threadibly engages said male-threaded exterior surface of said substantially cylindrical main body member of said actuator mechanism.
21. The hammer-action attachment of claim 15, wherein said first and second arm members are longitudinally flexible.
22. The hammer-action attachment of claim 15, wherein said substantially cylindrical main body member of said actuator mechanism comprises a plastic overmold molded over a substantially cylindrical core.
23. The hammer-action attachment of claim 22, wherein said plastic overmold has a forwardly extending annular portion, and said actuator mechanism has at least one roller member freely rotatably mounted thereon so as to be covered by said forwardly extending annular portion, and wherein when said actuator mechanism is in said forwardly displaced position said at least one roller member engages said impact surface as said main shaft rotates with respect to said actuator mechanism.
24. The hammer-action attachment of claim 15, wherein said drill engaging member is made substantially from acrylonitrile butadiene styrene plastic.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2555585 CA2555585A1 (en) | 2006-08-08 | 2006-08-08 | Hammer-action attachment for use with a conventional electric drill |
| PCT/CA2007/001377 WO2008025127A2 (en) | 2006-08-08 | 2007-08-08 | Hammer-action attachment for use with a conventional electric drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2555585 CA2555585A1 (en) | 2006-08-08 | 2006-08-08 | Hammer-action attachment for use with a conventional electric drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2555585A1 true CA2555585A1 (en) | 2008-02-08 |
Family
ID=39030921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2555585 Abandoned CA2555585A1 (en) | 2006-08-08 | 2006-08-08 | Hammer-action attachment for use with a conventional electric drill |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2555585A1 (en) |
| WO (1) | WO2008025127A2 (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 |
| NL232950A (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 |
| US5494114A (en) * | 1993-01-06 | 1996-02-27 | Globe Fire Sprinkler Corporation | Fire extinguisher sprinkler construction |
-
2006
- 2006-08-08 CA CA 2555585 patent/CA2555585A1/en not_active Abandoned
-
2007
- 2007-08-08 WO PCT/CA2007/001377 patent/WO2008025127A2/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008025127A2 (en) | 2008-03-06 |
| WO2008025127A3 (en) | 2008-04-17 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |