CA2508038C - Hammer drill bit chuck attachment - Google Patents
Hammer drill bit chuck attachment Download PDFInfo
- Publication number
- CA2508038C CA2508038C CA 2508038 CA2508038A CA2508038C CA 2508038 C CA2508038 C CA 2508038C CA 2508038 CA2508038 CA 2508038 CA 2508038 A CA2508038 A CA 2508038A CA 2508038 C CA2508038 C CA 2508038C
- Authority
- CA
- Canada
- Prior art keywords
- annular flange
- shank portion
- toothed surface
- drive shaft
- flange portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25D—PERCUSSIVE TOOLS
- B25D11/00—Portable percussive tools with electromotor or other motor drive
- B25D11/06—Means for driving the impulse member
- B25D11/10—Means for driving the impulse member comprising a cam mechanism
- B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
- B25D11/106—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool cam member and cam follower having the same shape
-
- 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
- B25D17/00—Details of, or accessories for, portable power-driven percussive tools
- B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Percussive Tools And Related Accessories (AREA)
Abstract
A hammer drill bit chuck attachment comprises a drive shaft for rotation by a drill. The drive shaft has a shank portion defining a longitudinal axis and an annular flange portion projecting radially outwardly from the shank portion for longitudinal and rotational movement therewith. The annular flange portion having a rearwardly facing toothed surface. A drill bit chuck is mountable on the drive shaft forwardly of the annular flange portion for rotation with the drive shaft. An actuator collar has a forwardly facing toothed surface and is mounted on the shank portion rearwardly of the annular flange portion, for free rotation about the shank portion and for longitudinal sliding movement along the shank portion between a forward operatively engaged position whereat the forwardly facing toothed surface of the actuator collar is in rotational engagement with the rearwardly facing toothed surface of the annular flange portion as the shank portion is rotated, to thereby impart reciprocating motion along the longitudinal axis to the shank portion, and a rearward released position wherein the forwardly facing toothed surface of the actuator collar is removed from the rotational engagement with the rearwardly facing toothed surface of the annular flange portion. A spring is operatively mounted between the actuator collar and the drive shaft for biasing the actuator collar to the forward operatively engaged position.
Description
FIELD OF THE 7~VENT~ON
(0001] The present invention relates to hammer drills, end mpre particularly to hammer drill.bit-chuck attachments and hammer drill bits.
BACKGROUND OF SHE INVED1~.
[0002 Hammer drills are well known and are typically used, even by home craftsmen, to-drill hales in relative~.y hard substances, such as concrete and the like. Such hammer drills typically have a rotating spindle that drives the drill chuck, Pr fixed disc s having a rearwardly facing toothed surface is secured to the I
rata-tzons s~2-rt~lc. A mova3~le disc having- a fo-rw-ardly facing toothed surface is selectively engageable with the rea~warc~ly facing toothed-suxf.ace of .the fixed. disc so as to provide the hammer drill function. Although the apparatus does work, it presents- a s~ricTws drawback- in that the impact created by the engagement of the two toothed surfaces is directed fo~warc~ly through the drill.bi.t and also back through the drill =itself, as a I
reaction force. Accordingly, the bearings of the drill tend to ' wear excessively, which is highly undesirable.
[0003] Such hammer drills, also known as percussion dribs, fan 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.
[0004 United States Patent 4,450,919, issued May 29, x.984 to Cousineau discloses a drill.-attachment ~'or use with . conventional electric drill. This drill attachment provides a hammering and drzllincl action scr that- a co-rrvent-ional drill may be used to drill into hard substances. The drill 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 mounted i-n the front end thereof. The rotating spindle i I
drives a drill chuck within the chuck assembly via the reciprocating .spindle_ :A rotating clutch plate mounted on the reciprocating spindle rotates with the reciprocating spindle.
Teeth an the r~rtating c3uteh-plate eng-age coope-ratiwg- teeth on the stationary clutch that is securely mounted on the cafe. A
removable handle connected to~the case-permits the ease, end therefore the stationary clutch, to be selectively moved forwardly such that the- teeth o~f tire stationary- clutch -engag-e- tile teeth of the rotating clutch plate, to thereby impaxt the hammering function to a drill bit retained within th.e bit shuck. The reaction force is not transmitted back through the drill itself, but is transmitted to the handle, thus saving wear on the bearings of the drill_ f3owever., the.above.described drill attachment.-is.far more complicated and far more expensive than is necessary. Further, this p-articrrla~r apparatus is not adaptable directly to being incorporated into a drill bit'.
[0005] It is a further object of the present invention to provide a simplified hammer drill bit chuck attachment.
I
[0006] It is yet a further object of the present inver~tion to provide a .simplified hammer drill b.it chuck attachment that is inexpensive to manufacture.
Sf~ARY OF THE I~VENT~ON
[0007] In accordance with one aspect of the present inYenta,on i there is disclosed a novel hammer drill bit chuck attachment i comprises a drive shaft for rotation by a drill.. The drive shaft h-awa--s~xank p-anion def-fining a--farrgTtudina-1 axis a-nd an annular flange portion projecting radially outwardly from the shank portion for longitud-final and rotational movement therewith_ The annular flange portion having a rearwardly facing toothed surface. A drill bit chuck is mountable on the drive shaft forwardly of the annular j flange portion for rotation with the drive shaft. An aptua~or collar has a forwardly facing toothed sur.f~ace and is mounted on the shank portion rearwardly of the annular flange portion, for free rotation about the- shank portion and for longitudinal sliding movement along the shank portion between a forward oper~tive;ly engaged po-s.i_tion wherEat the forwardly facing toothed surrace of the actuator collar is in rotational engagement with the rearwardly fac-irrc~ -toothed- surface- of th-a annular flange portion- as the shank portion is rotated, to thereby impart reciprocating motion along the longitudinal axis to. the shan3c portion, and a rearward weleased position wherein the forwardly facing toothed surface of the actuator co-llar is-- removed--from-tt°re rotational engagement with the rearwardly facing toothed surface of the annular flange p~rtiQn.
A spring means .is operativeiy.mounted between the actuator collar and the drive shaft for biasing the actuator collar to the forward operatively engaged position.
[0008] Other advantages, features and characteristics of the present invention-, as wel-l.as methods of:operation.and funct~.ons of the related elements of the structure, and the combination of parts and economies- ~f- manufacture, will become more apparent upon consideration of the following detailed description end the appended claims with -r~f~r-enc~ to the accompanying .drawings, the latter of which is briefly described herein below.
BRIEF DESCRTPTION OF THE DRAWING.
[0009] The novel features which are believed to be chara-eteristic o~ the Ytammer drill bit and-hammer- droll bit chuck attachment according to the present invention, as to its stricture, organization, use and me.thod..of operation, together with further objectives and advantages thereof, will be better understood from th-a following- drawzwgs .in w~rieh~ a presently preferred- embodiment of the invention will now be illustrated by way of example. It is expressly understood, however, that the drawings are fr~r the purpose of illustration and description only, and are not intended as a definition of the limits of the invention. In the accompanying drawings:
i [00010] Figure 1 is a perspective view from the front of the first-preferred embodiment of ahe hammer drill bit chuck attachment according to the present invention;
[00011] F~.gure 2 is a perspective view from the rear of tie first preferred embodiment hammer drill bit chuck attachment of Figure l;
[00012) Figure 3 is a perspective view from the front of the first pre.f.erred embr~d~nent hammer drill bit chuck :attachment of Figure l, connected to a drill chuck;
[00013] Figure 4 is a perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure l, connected to a drill chuck;
[00014] Figure S is an exploded perspective view from the rear of the first-:preferred embodiment hammer drill fit chuck.attachment of Figure 1;
[00015] Figure 5 is an exploded perspective view from tP~e front I
of the first preferred.-embodiment hammer.drill bit chuck attachment of Figure 1;
[00016] Figure 7 is a sectional side elevational view of the first preferred embodiment .hammer drill bit chuck of Figure 1, taken along section line 7 - 7 of Figure 2:
[00017] Figure 8 is a sectional side elevational view of the first ..preferred embodiment hammer drill bit chuck -of Figure 1, taken along section line 8 - 8 of Figure 4;
[00018] Figure 9 is an enlarged sectional side elevatior~al view of a recess in the back .end .of the actuator collar o.f the first preferred embodiment hammer drill bit chuck of Figure 1:
[00019] Figure 10 is an enlarged sectional side elevational view of the forwardly facing toothed surface and the rearwardly facing toothed surface of the first preferred embodiment hammer drill bit chuck- of Figure l, with the actuator collar in a forward operatively engaged position: and, , (00020] Figure 11 is an enlarged sectional side elevational view similar- to Figure 10, but with the actuator collar in a rearward released position. i DETAINED DESCRIPTION OF THE PREFERRED EMBODIMENT
[00021] Reference will now be made to Figures 1 through 1T, which show a preferred embodiment of the hammer drill bit chuck attachment of the present invention, as indicated by general reference- numeral 120. The hammer drill bit chuck attachment 120 comprises a drive shaft 130 for rotation by a drill (not shown).
The drive shaft 130 has a shank portion 1-34 def~n~ng-a longitudinal axis "Z" about which the drive shaft 130 rotates.
i (00022] An annular flange portion 140 projects radially outwardly from the shank.portion 134 fox longitudinal and rotational movement therewith. Preferably, the annular flange portion 140 and the shank portion 134 are integrally farmed one with- the other for reasons of strength, ease of manufacture and cost effectiveness.
(00023] The annular flange portion 140 comprises a main body member 14W and- a re-arwarcH rirtq_member- 144 secured to- the main body member 142 within a rearwardly facing annular recess 145.. The annular flange portion 140 has.a rearwardly facing t~oflthed surface , 146 formed on the rearward ring member 144 and has a plurality of ' radial-l~r directed- teeth- 1v8 that' axe substantially evenly spaced I
around the rearwardly facing toothed surface 1~6.
(00024] A drill bit chuck 135 is mounted on a forward threaded i Bart-rare 13v o-f the d-rive- s~h~ft 13o- farwardly. of tlge annular flange portion 140 for rotation with the drive shaft 130. The drill fit chuck 13.5 comprises three.movable jaw members 136 thatwreceive and retain a conventional drill bit 129 therein.
[00025] An actuator collar 150 comprises a main body memlper X52 ;
and a forward ring member.154 aecured to the main body-member 152 within a forwardly facing annular recess 155. The actuator collar _ ~ _ .
150 has a forwardly facing toothed surface 156 formed on the forward.~ing member 154 and.has a pl~ra2ity of radially directed teeth 158 that are substantially evenly spaced around the forwardly facing toothed surface 156.
[00026] The actuator collar 150 is mounted on the shank portion 134 rearwardly of the annular flange portion 140, for free rotation t I
about the shank portion 134 and for longitudinal sliding movement along . the- swank portsorr 134. 1n- the preferred e~ctbodiment, as illustrated, the actuator collar 150 is retained on the, shank portion 134 by means of a "C"-clip 160 securely engaged in an annular slot 162 in the shank portion 134. Other suitable means may also be used.
[00027] The actuator collar 150 is mounted on the shank portion 134., as described.above,..for free_rotation about the s3~ank portion 234 and for longitudinal sliding movement along the shank portion 134- between a forward operatively.engaged position, -as is best seen in Figure 10, and a rearward released position, as is best been in Figure 11.
[00028] A spring means comprising a coil spring 170 is operatively mamrted betw~err the actuato-r collar lea and the drive shaft 130 for biasing the actuator collar 150 to the forward operatively engaged position. The coil spring 170 sits taw~thin a recesa 152. in tvhe back end of the .actuator collar 150, and surrounds the back end of the shank portion 134 of the drive shaft 13E?~ Phe coil sprir~g:l7-0 bea-~s aga.l.-nst the forward-end- 7.52a of the recess 152 and also bears against a washer 153, which itself begs g " ,. p a ainst the G -cli. 100 ~ this manner., the coilwspring 170 biases the actuator collar to its forward operatively engaged position.
[00029] In the forward operatively engaged position, the forwardl.y facing toothed-.surface 156 of the actuator collar 150 is in rotational engagement with the rearwardly facing toothed surface 146 of the annular flange- portion- 14-0- as- the d-rivew shaft 130 is rotated. In the rearward released position, the forwardly facing ', toothed..surface .156 . of the actuatox eo.llar X50 is removed .from the rotational engagement with the rearwardly facing toothed surface 14.6 of the- anrnrlar flange portion 14E?. The shank portion 134 merely freely rotates within the actuator collar 15~k::
[00030] As the drive shaft 130 is rotated, and as the actuator i collar 15f? 'is ~ravnually heic~-~ the- rearwarctly .facing-toothed surface i i 146 of the annular flan a g portion 140 moves across the f~rwac~ly facing ..toothed surface 1-56 of the ,actuator collar 1-50., thus causing the actuator collar to make longitudinally in a reciprocal with - 1p -respect to the drive shaft 130, between the forward oper~tive~ly I
engaged .:position, as is best -shown in Figure . 10, and .the -rearward released position, as is best seen in Figure 11. The teeth 158 of ' tl~re~ f-orward-ly facing toothed surfaec- 1-5fr quickly: impact the teeth 148 of the rearwardly facing toothed surface 146 as the shank portion .134., and .therefore the annular flange po-rtion 140., is rotated by a conventional electric drill (not shown). The actuator collar 15f? there~ry imparts reciprocating motion along the longitudinal axis "h" to the drill bit chuck 135, and therefore to the con.vQn.tianal drill bit 129 reta;n_ed.therein. In .this manner, the conventional drill bit 129 is caused to "hammer" into a piece of nraterzal as it rotates f t~rus causi-ng a drill hole to be drilled readily even into hard materials, such as cement or concrete. It should.-also. be noted .that the drill .12.2 .i.tself does ~vt- absorb the reaction of the impact of the teeth 158 of the forwardly facing taathed surface 156 on the teeth 148 of the rearwardly facing toothed surface x;46.
[000317 As can be understood from the above description apd from the aceompanyiwg drawings, the :pre-sent invention provides a simplified hammer drill bit chuck attachment that is inexpensive to manufacture, which is unknown in the prior art.
[00032] Other variations of the above principles will be a~pargnt to those who arm ~nawledgeable in tha field. of the inveration~ and such variations are considered to be within the scope of the present inventzan. Furthe-r~ other modif~cationswand alterations may be used in the design and manufacture of the hammer drill fit and hammer driil bit .ch ek attachment of the present invention without departing from the spirit and scope of the accompanying claims.
(0001] The present invention relates to hammer drills, end mpre particularly to hammer drill.bit-chuck attachments and hammer drill bits.
BACKGROUND OF SHE INVED1~.
[0002 Hammer drills are well known and are typically used, even by home craftsmen, to-drill hales in relative~.y hard substances, such as concrete and the like. Such hammer drills typically have a rotating spindle that drives the drill chuck, Pr fixed disc s having a rearwardly facing toothed surface is secured to the I
rata-tzons s~2-rt~lc. A mova3~le disc having- a fo-rw-ardly facing toothed surface is selectively engageable with the rea~warc~ly facing toothed-suxf.ace of .the fixed. disc so as to provide the hammer drill function. Although the apparatus does work, it presents- a s~ricTws drawback- in that the impact created by the engagement of the two toothed surfaces is directed fo~warc~ly through the drill.bi.t and also back through the drill =itself, as a I
reaction force. Accordingly, the bearings of the drill tend to ' wear excessively, which is highly undesirable.
[0003] Such hammer drills, also known as percussion dribs, fan 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.
[0004 United States Patent 4,450,919, issued May 29, x.984 to Cousineau discloses a drill.-attachment ~'or use with . conventional electric drill. This drill attachment provides a hammering and drzllincl action scr that- a co-rrvent-ional drill may be used to drill into hard substances. The drill 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 mounted i-n the front end thereof. The rotating spindle i I
drives a drill chuck within the chuck assembly via the reciprocating .spindle_ :A rotating clutch plate mounted on the reciprocating spindle rotates with the reciprocating spindle.
Teeth an the r~rtating c3uteh-plate eng-age coope-ratiwg- teeth on the stationary clutch that is securely mounted on the cafe. A
removable handle connected to~the case-permits the ease, end therefore the stationary clutch, to be selectively moved forwardly such that the- teeth o~f tire stationary- clutch -engag-e- tile teeth of the rotating clutch plate, to thereby impaxt the hammering function to a drill bit retained within th.e bit shuck. The reaction force is not transmitted back through the drill itself, but is transmitted to the handle, thus saving wear on the bearings of the drill_ f3owever., the.above.described drill attachment.-is.far more complicated and far more expensive than is necessary. Further, this p-articrrla~r apparatus is not adaptable directly to being incorporated into a drill bit'.
[0005] It is a further object of the present invention to provide a simplified hammer drill bit chuck attachment.
I
[0006] It is yet a further object of the present inver~tion to provide a .simplified hammer drill b.it chuck attachment that is inexpensive to manufacture.
Sf~ARY OF THE I~VENT~ON
[0007] In accordance with one aspect of the present inYenta,on i there is disclosed a novel hammer drill bit chuck attachment i comprises a drive shaft for rotation by a drill.. The drive shaft h-awa--s~xank p-anion def-fining a--farrgTtudina-1 axis a-nd an annular flange portion projecting radially outwardly from the shank portion for longitud-final and rotational movement therewith_ The annular flange portion having a rearwardly facing toothed surface. A drill bit chuck is mountable on the drive shaft forwardly of the annular j flange portion for rotation with the drive shaft. An aptua~or collar has a forwardly facing toothed sur.f~ace and is mounted on the shank portion rearwardly of the annular flange portion, for free rotation about the- shank portion and for longitudinal sliding movement along the shank portion between a forward oper~tive;ly engaged po-s.i_tion wherEat the forwardly facing toothed surrace of the actuator collar is in rotational engagement with the rearwardly fac-irrc~ -toothed- surface- of th-a annular flange portion- as the shank portion is rotated, to thereby impart reciprocating motion along the longitudinal axis to. the shan3c portion, and a rearward weleased position wherein the forwardly facing toothed surface of the actuator co-llar is-- removed--from-tt°re rotational engagement with the rearwardly facing toothed surface of the annular flange p~rtiQn.
A spring means .is operativeiy.mounted between the actuator collar and the drive shaft for biasing the actuator collar to the forward operatively engaged position.
[0008] Other advantages, features and characteristics of the present invention-, as wel-l.as methods of:operation.and funct~.ons of the related elements of the structure, and the combination of parts and economies- ~f- manufacture, will become more apparent upon consideration of the following detailed description end the appended claims with -r~f~r-enc~ to the accompanying .drawings, the latter of which is briefly described herein below.
BRIEF DESCRTPTION OF THE DRAWING.
[0009] The novel features which are believed to be chara-eteristic o~ the Ytammer drill bit and-hammer- droll bit chuck attachment according to the present invention, as to its stricture, organization, use and me.thod..of operation, together with further objectives and advantages thereof, will be better understood from th-a following- drawzwgs .in w~rieh~ a presently preferred- embodiment of the invention will now be illustrated by way of example. It is expressly understood, however, that the drawings are fr~r the purpose of illustration and description only, and are not intended as a definition of the limits of the invention. In the accompanying drawings:
i [00010] Figure 1 is a perspective view from the front of the first-preferred embodiment of ahe hammer drill bit chuck attachment according to the present invention;
[00011] F~.gure 2 is a perspective view from the rear of tie first preferred embodiment hammer drill bit chuck attachment of Figure l;
[00012) Figure 3 is a perspective view from the front of the first pre.f.erred embr~d~nent hammer drill bit chuck :attachment of Figure l, connected to a drill chuck;
[00013] Figure 4 is a perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure l, connected to a drill chuck;
[00014] Figure S is an exploded perspective view from the rear of the first-:preferred embodiment hammer drill fit chuck.attachment of Figure 1;
[00015] Figure 5 is an exploded perspective view from tP~e front I
of the first preferred.-embodiment hammer.drill bit chuck attachment of Figure 1;
[00016] Figure 7 is a sectional side elevational view of the first preferred embodiment .hammer drill bit chuck of Figure 1, taken along section line 7 - 7 of Figure 2:
[00017] Figure 8 is a sectional side elevational view of the first ..preferred embodiment hammer drill bit chuck -of Figure 1, taken along section line 8 - 8 of Figure 4;
[00018] Figure 9 is an enlarged sectional side elevatior~al view of a recess in the back .end .of the actuator collar o.f the first preferred embodiment hammer drill bit chuck of Figure 1:
[00019] Figure 10 is an enlarged sectional side elevational view of the forwardly facing toothed surface and the rearwardly facing toothed surface of the first preferred embodiment hammer drill bit chuck- of Figure l, with the actuator collar in a forward operatively engaged position: and, , (00020] Figure 11 is an enlarged sectional side elevational view similar- to Figure 10, but with the actuator collar in a rearward released position. i DETAINED DESCRIPTION OF THE PREFERRED EMBODIMENT
[00021] Reference will now be made to Figures 1 through 1T, which show a preferred embodiment of the hammer drill bit chuck attachment of the present invention, as indicated by general reference- numeral 120. The hammer drill bit chuck attachment 120 comprises a drive shaft 130 for rotation by a drill (not shown).
The drive shaft 130 has a shank portion 1-34 def~n~ng-a longitudinal axis "Z" about which the drive shaft 130 rotates.
i (00022] An annular flange portion 140 projects radially outwardly from the shank.portion 134 fox longitudinal and rotational movement therewith. Preferably, the annular flange portion 140 and the shank portion 134 are integrally farmed one with- the other for reasons of strength, ease of manufacture and cost effectiveness.
(00023] The annular flange portion 140 comprises a main body member 14W and- a re-arwarcH rirtq_member- 144 secured to- the main body member 142 within a rearwardly facing annular recess 145.. The annular flange portion 140 has.a rearwardly facing t~oflthed surface , 146 formed on the rearward ring member 144 and has a plurality of ' radial-l~r directed- teeth- 1v8 that' axe substantially evenly spaced I
around the rearwardly facing toothed surface 1~6.
(00024] A drill bit chuck 135 is mounted on a forward threaded i Bart-rare 13v o-f the d-rive- s~h~ft 13o- farwardly. of tlge annular flange portion 140 for rotation with the drive shaft 130. The drill fit chuck 13.5 comprises three.movable jaw members 136 thatwreceive and retain a conventional drill bit 129 therein.
[00025] An actuator collar 150 comprises a main body memlper X52 ;
and a forward ring member.154 aecured to the main body-member 152 within a forwardly facing annular recess 155. The actuator collar _ ~ _ .
150 has a forwardly facing toothed surface 156 formed on the forward.~ing member 154 and.has a pl~ra2ity of radially directed teeth 158 that are substantially evenly spaced around the forwardly facing toothed surface 156.
[00026] The actuator collar 150 is mounted on the shank portion 134 rearwardly of the annular flange portion 140, for free rotation t I
about the shank portion 134 and for longitudinal sliding movement along . the- swank portsorr 134. 1n- the preferred e~ctbodiment, as illustrated, the actuator collar 150 is retained on the, shank portion 134 by means of a "C"-clip 160 securely engaged in an annular slot 162 in the shank portion 134. Other suitable means may also be used.
[00027] The actuator collar 150 is mounted on the shank portion 134., as described.above,..for free_rotation about the s3~ank portion 234 and for longitudinal sliding movement along the shank portion 134- between a forward operatively.engaged position, -as is best seen in Figure 10, and a rearward released position, as is best been in Figure 11.
[00028] A spring means comprising a coil spring 170 is operatively mamrted betw~err the actuato-r collar lea and the drive shaft 130 for biasing the actuator collar 150 to the forward operatively engaged position. The coil spring 170 sits taw~thin a recesa 152. in tvhe back end of the .actuator collar 150, and surrounds the back end of the shank portion 134 of the drive shaft 13E?~ Phe coil sprir~g:l7-0 bea-~s aga.l.-nst the forward-end- 7.52a of the recess 152 and also bears against a washer 153, which itself begs g " ,. p a ainst the G -cli. 100 ~ this manner., the coilwspring 170 biases the actuator collar to its forward operatively engaged position.
[00029] In the forward operatively engaged position, the forwardl.y facing toothed-.surface 156 of the actuator collar 150 is in rotational engagement with the rearwardly facing toothed surface 146 of the annular flange- portion- 14-0- as- the d-rivew shaft 130 is rotated. In the rearward released position, the forwardly facing ', toothed..surface .156 . of the actuatox eo.llar X50 is removed .from the rotational engagement with the rearwardly facing toothed surface 14.6 of the- anrnrlar flange portion 14E?. The shank portion 134 merely freely rotates within the actuator collar 15~k::
[00030] As the drive shaft 130 is rotated, and as the actuator i collar 15f? 'is ~ravnually heic~-~ the- rearwarctly .facing-toothed surface i i 146 of the annular flan a g portion 140 moves across the f~rwac~ly facing ..toothed surface 1-56 of the ,actuator collar 1-50., thus causing the actuator collar to make longitudinally in a reciprocal with - 1p -respect to the drive shaft 130, between the forward oper~tive~ly I
engaged .:position, as is best -shown in Figure . 10, and .the -rearward released position, as is best seen in Figure 11. The teeth 158 of ' tl~re~ f-orward-ly facing toothed surfaec- 1-5fr quickly: impact the teeth 148 of the rearwardly facing toothed surface 146 as the shank portion .134., and .therefore the annular flange po-rtion 140., is rotated by a conventional electric drill (not shown). The actuator collar 15f? there~ry imparts reciprocating motion along the longitudinal axis "h" to the drill bit chuck 135, and therefore to the con.vQn.tianal drill bit 129 reta;n_ed.therein. In .this manner, the conventional drill bit 129 is caused to "hammer" into a piece of nraterzal as it rotates f t~rus causi-ng a drill hole to be drilled readily even into hard materials, such as cement or concrete. It should.-also. be noted .that the drill .12.2 .i.tself does ~vt- absorb the reaction of the impact of the teeth 158 of the forwardly facing taathed surface 156 on the teeth 148 of the rearwardly facing toothed surface x;46.
[000317 As can be understood from the above description apd from the aceompanyiwg drawings, the :pre-sent invention provides a simplified hammer drill bit chuck attachment that is inexpensive to manufacture, which is unknown in the prior art.
[00032] Other variations of the above principles will be a~pargnt to those who arm ~nawledgeable in tha field. of the inveration~ and such variations are considered to be within the scope of the present inventzan. Furthe-r~ other modif~cationswand alterations may be used in the design and manufacture of the hammer drill fit and hammer driil bit .ch ek attachment of the present invention without departing from the spirit and scope of the accompanying claims.
Claims
1. A hammer drill bit chuck attachment comprising:
a drive shaft for rotation by a drill, said drive shaft having a shank portion defining a longitudinal axis and an annular flange portion projecting radially outwardly from said shank portion for longitudinal and rotational movement therewith, said annular flange portion having a rearwardly facing toothed surface:
wherein a drill bit chuck is mountable on said drive shaft forwardly of said annular flange portion for rotation with said drive shaft;
an actuator collar having a forwardly facing toothed surface and mounted on said shank portion rearwardly of said annular flange portion, for free rotation about said shank portion and for longitudinal sliding movement along said shank portion between a forward operatively engaged position whereat said forwardly facing toothed surface of said actuator collar is in rotational engagement with said rearwardly facing toothed surface of said annular flange portion as said shank portion is rotated, to thereby impart reciprocating motion along said longitudinal axis to said shank portion, and a rearward released position wherein said forwardly facing toothed surface of said actuator collar is removed from said rotational engagement with said rearwardly facing toothed surface of said annular flange portion; and, spring means operatively mounted between said actuator collar and said drive shaft for biasing said actuator collar to said forward operatively engaged position.
a drive shaft for rotation by a drill, said drive shaft having a shank portion defining a longitudinal axis and an annular flange portion projecting radially outwardly from said shank portion for longitudinal and rotational movement therewith, said annular flange portion having a rearwardly facing toothed surface:
wherein a drill bit chuck is mountable on said drive shaft forwardly of said annular flange portion for rotation with said drive shaft;
an actuator collar having a forwardly facing toothed surface and mounted on said shank portion rearwardly of said annular flange portion, for free rotation about said shank portion and for longitudinal sliding movement along said shank portion between a forward operatively engaged position whereat said forwardly facing toothed surface of said actuator collar is in rotational engagement with said rearwardly facing toothed surface of said annular flange portion as said shank portion is rotated, to thereby impart reciprocating motion along said longitudinal axis to said shank portion, and a rearward released position wherein said forwardly facing toothed surface of said actuator collar is removed from said rotational engagement with said rearwardly facing toothed surface of said annular flange portion; and, spring means operatively mounted between said actuator collar and said drive shaft for biasing said actuator collar to said forward operatively engaged position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2508038 CA2508038C (en) | 2005-05-17 | 2005-05-17 | Hammer drill bit chuck attachment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2508038 CA2508038C (en) | 2005-05-17 | 2005-05-17 | Hammer drill bit chuck attachment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2508038A1 CA2508038A1 (en) | 2006-11-17 |
| CA2508038C true CA2508038C (en) | 2013-12-17 |
Family
ID=37450479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2508038 Expired - Fee Related CA2508038C (en) | 2005-05-17 | 2005-05-17 | Hammer drill bit chuck attachment |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2508038C (en) |
-
2005
- 2005-05-17 CA CA 2508038 patent/CA2508038C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2508038A1 (en) | 2006-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20190517 |