WO2008017151A2 - Dispositif de serrage de trépan de marteau perforateur - Google Patents

Dispositif de serrage de trépan de marteau perforateur Download PDF

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Publication number
WO2008017151A2
WO2008017151A2 PCT/CA2007/001378 CA2007001378W WO2008017151A2 WO 2008017151 A2 WO2008017151 A2 WO 2008017151A2 CA 2007001378 W CA2007001378 W CA 2007001378W WO 2008017151 A2 WO2008017151 A2 WO 2008017151A2
Authority
WO
WIPO (PCT)
Prior art keywords
actuator mechanism
drill bit
hammer drill
main shaft
bit chuck
Prior art date
Application number
PCT/CA2007/001378
Other languages
English (en)
Other versions
WO2008017151A3 (fr
Inventor
Fern Beauchamp
Gerard Grand
Original Assignee
Fern Beauchamp
Gerard Grand
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fern Beauchamp, Gerard Grand filed Critical Fern Beauchamp
Publication of WO2008017151A2 publication Critical patent/WO2008017151A2/fr
Publication of WO2008017151A3 publication Critical patent/WO2008017151A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism
    • B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
    • B25D11/104—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool with rollers or balls as cam surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/008—Chucks; Expansion mandrels; Adaptations thereof for remote control with arrangements for transmitting torque
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/11—Retention by threaded connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/003—Attachments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D11/00—Portable percussive tools with electromotor or other motor drive
    • B25D11/06—Means for driving the impulse member
    • B25D11/10—Means for driving the impulse member comprising a cam mechanism
    • B25D11/102—Means for driving the impulse member comprising a cam mechanism the rotating axis of the cam member being coaxial with the axis of the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters therefor

Definitions

  • the present invention relates to hammer drills, and more particularly to hammer drill bit chuck attachments.
  • Hammer drills are well known and are typically used, even by home craftsmen, to drill holes in relatively hard substances, such as concrete and the like.
  • Such hammer drills typically have a rotating spindle that drives the drill chuck.
  • a fixed disc having a rearwardly facing toothed surface is secured to the rotations spindle.
  • a movable disc having a forwardly facing toothed surface is selectively engageable with the rearwardly facing toothed surface of the fixed disc so as to provide the hammer drill function.
  • the apparatus does work, it presents a serious drawback in that the impact created by the engagement of the two toothed surfaces is directed forwardly through the drill bit and also back through the drill itself, as a reaction force. Accordingly, the bearings of the drill tend to wear excessively, which is highly undesirable. Further, it is well known that there can be significant heat build with prior art hammer drills.
  • 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 Thurier.
  • United States Patent 4,450,919, issued May 29, 1984 to Cousineau discloses a drill attachment for use with a conventional electric drill.
  • This drill attachment provides a hammering and drilling action so that a conventional drill may be used to drill into hard substances.
  • the 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 in the front end thereof.
  • the rotating spindle 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 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.
  • 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.
  • the above described drill attachment is far more complicated and far more expensive than is necessary.
  • a novel hammer drill bit chuck attachment comprising a main shaft having a forward drill chuck end portion and a rearward shank portion, and defining a longitudinal axis.
  • An impact member is mounted in fixed relation on the main shaft for rotation therewith.
  • An actuator mechanism is mounted on the main shaft for free rotation of the main shaft with respect to the actuator mechanism and for longitudinal sliding movement of the actuator mechanism along the main shaft between a forwardly displaced position and a rearwardly displaced position.
  • At least one impact portion is disposed on one of the impact member and the actuator mechanism.
  • At least one roller member is rotationally mounted on the other of the impact member and the actuator mechanism.
  • Figure 1 is a perspective view from the front of the first preferred embodiment of the hammer drill bit chuck attachment according to the present invention
  • Figure 2 is a perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
  • Figure 3 is an exploded perspective view from the front of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
  • Figure 4 is an exploded perspective view from the rear of the first preferred embodiment hammer drill bit chuck attachment of Figure 1;
  • Figure 5 is an enlarged exploded perspective view from the front of a portion of the second preferred embodiment hammer drill bit chuck attachment of Figure 1;
  • Figure 6 is an enlarged exploded perspective view from the back of a portion of the second preferred embodiment hammer drill bit chuck attachment of Figure 1;
  • Figure 7 is a side elevational view of the hammer drill bit chuck attachment of Figure 1 , but with the actuator mechanism in a fully forward position;
  • Figure 8 is a perspective view from the rear of the hammer drill bit chuck attachment as shown in
  • Figure 9 is a side elevational view similar to Figure 7, but with the actuator mechanism in a disengaged position
  • Figure 10 is a perspective view from the front of a second preferred embodiment of the hammer drill bit chuck attachment according to the present invention.
  • Figure 11 is a perspective view of a portion of the second preferred embodiment of the hammer drill bit chuck attachment of Figure 10;
  • Figure 12 is a perspective view from the front of the third preferred embodiment of the hammer drill bit chuck according to the present invention, without a drill chuck in place;
  • Figure 13 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12;
  • Figure 14 is a side elevational view of the third preferred embodiment hammer drill bit chuck of
  • Figure 15 is a side elevational view of the third preferred embodiment hammer drill bit chuck of
  • Figure 16 is a rear elevational view of the third preferred embodiment hammer drill bit chuck of
  • Figure 17 is an exploded perspective view from the front of the third preferred embodiment hammer drill bit chuck of Figure 12;
  • Figure 18 is an exploded perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12;
  • Figure 19 is an exploded side elevational view of the third preferred embodiment hammer drill bit chuck of Figure 12;
  • Figure 20 is a perspective view from the front of the third preferred embodiment hammer drill bit chuck of Figure 12, without a drill chuck in place;
  • Figure 21 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12;
  • Figure 22 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the actuator collar;
  • Figure 23 is a perspective view from the rear of the third preferred embodiment hammer drill bit chuck of Figure 12, showing the stationary toothed collar and the elongate main shaft;
  • Figure 24 is a end elevational view of the third preferred embodiment hammer drill bit chuck of
  • Figure 25 is a perspective view from the front of an alternative embodiment of the hammer drill bit chuck according to the present invention.
  • Figure 26 is an exploded perspective view from the front of the fourth preferred embodiment of the hammer drill bit chuck according to the present invention
  • Figure 27 is an exploded perspective view from the rear of the fourth preferred embodiment of Figure 26;
  • Figure 28 is a cross-sectional view of the fourth preferred embodiment of Figure 26, in place on a drill chuck;
  • Figure 29 is a cross-sectional view of the fourth preferred embodiment of Figure 26, without the drill chuck.
  • Figures 1 through 29 of the drawings illustrate a first preferred embodiment of the hammer drill bit chuck attachment of the present invention
  • Figures 10 and 11 illustrates a second preferred embodiment of the hammer drill bit chuck attachment of the present invention
  • Figures 12 through 25 illustrate a third preferred embodiment of the hammer drill bit chuck attachment of the present invention
  • 26 through 29 illustrate a fourth preferred embodiment of the hammer drill bit chuck attachment of the present invention.
  • the hammer drill bit chuck attachment 120 comprises a main shaft 130 having a threaded forward drill chuck end portion 132, an intermediate impact member receiving portion 133, and a rearward shank portion 134.
  • the main shaft 130 defines a longitudinal axis "L" about which the main shaft 130 rotates.
  • a drill bit chuck 135 is mountable on the forward drill chuck end portion 132 of the main shaft
  • the drill bit chuck 135 is a conventional drill bit chuck and comprises three movable jaw members 136 that receive and retain a conventional drill bit 129 therein.
  • a ferrule member 137 surrounds the jaw members 136 and is wedged between the jaw members 136 and an outer housing 138 to keep the jaw members 136 locked in place on the conventional drill bit 129.
  • a base member 139 is secured in place within the outer housing 138 and the back end 136b of the jaw members 136.
  • the base member 139 has a threaded bore hole 139a that receives a co-operating threaded forward portion 134a of the rearward shank portion 134 in secure engagement.
  • the hammer drill bit chuck attachment 120 comprises a main shaft 130, an impact member 190 and an actuator mechanism 150, as will be described in greater detail below.
  • An impact member 140 comprises a main body portion 142, a forwardly facing surface 145, a rearward facing surface 146 and at least one impact portion.
  • the at least one impact member can be mounted on the actuator mechanism 150.
  • the at least one impact portion comprises a plurality of impact portions 149.
  • the plurality of impact portions 149 comprise a plurality of impact protrusions 149.
  • the plurality of impact portions could comprise a plurality of impact indentations.
  • the impact member 140 is mounted in fixed relation on the main shaft 130 for rotation therewith, and projects radially outwardly from the intermediate impact member receiving portion 133.
  • the impact member 140 is threadibly engaged on the intermediate impact member receiving portion 133 the main shaft 130.
  • the threads on the forward drill chuck end portion 132 and the intermediate impact member receiving portion 133 are co-operatingly aligned with each other such that the impact member 140 can be threadibly engaged from the forward drill chuck end portion 132 to the intermediate impact member receiving portion 133.
  • the rearward facing impact surface 146 may be integrally formed on the main body portion 142, or alternatively, as shown in Figures 10 and 11 may be formed on a rearward ring member 145.
  • the alternative embodiment as shown in Figure 10 also shows a protective sheath 147 disposed over the actuator mechanism 150.
  • the protective sheath 147 is preferably made from a suitable plastic material and is overmolded over the actuator mechanism 150.
  • the plastic protective sheath 147 insulates an operator's hand from potential electric shock if the drill bit 129 happens to contact a live electrical wire during drilling.
  • the rearward facing impact surface 146 has a plurality of radially directed teeth 148 that are substantially evenly spaced around the rearward facing impact surface 146.
  • the radially directed teeth 148 of the rearward facing impact surface 146 may be irregularly spaced, or spaced apart in any other suitable manner.
  • An actuator mechanism 150 comprises a main body member 152, a forwardly facing surface 156 and a rearwardly facing surface 155.
  • the actuator mechanism 150 is mounted on the main shaft 130, mostly at the rearward shank portion 134 rearwardly of the impact member 140, for free rotation about the main shaft 130 and for longitudinal sliding movement along the main shaft 130.
  • the actuator mechanism 150 is retained on the rearward shank portion 134 by means of a "C"-clip 160 securely engaged in an annular slot 162 in the rearward shank portion 134.
  • Other suitable means may also be used.
  • the section of the rearward shank portion 134 disposed rearwardly of the impact member 140 must be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
  • At least one roller member and in the first preferred embodiment as illustrated, a plurality of roller members (specifically three roller members 160), are rotationally mounted on the main body member 152 of the actuator mechanism 150 by means of mounting pins 161 press fit into cooperating apertures 153 in the main body member 152.
  • the roller members 160 could be mounted on the impact member 140.
  • the axis of rotation "R" of each roller member 160 is substantially perpendicular to the longitudinal axis "L" of the main shaft 150.
  • the roller members 160 as illustrated, are bearing assemblies having an outer ring freely rotatably mounted onto an inner hub. Other suitable designs of roller members 160 could also be used.
  • the actuator mechanism 150 is mounted on the rearward shank portion 134, as described above, in freely rotatable relation on the main shaft 130 for rotation about the rearward shank portion 134 and for longitudinal sliding movement along the main shaft 130 between a forward forwardly displaced position, as is best seen in Figures 7 and 9, and a rearward rearwardly displaced position, as is best seen in Figure 8.
  • the "C"-clip 160 defines the rearward rearwardly displaced position of the actuator collar.
  • a manually manipulable handle 170 is removably connected to the actuator mechanism 150 by means of a threaded shaft 172 threadibly engaged in a co-operating threaded bore hole 151.
  • the handle 170 permits manual manipulation of the actuator mechanism 150 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 150 between the forward forwardly displaced position and the rearward rearwardly displaced position.
  • the manually manipulable handle 170 is preferably made from a suitable plastic material in order to insulate an operator's hand from potential electric shock if the drill bit 129 happens to contact a live electrical wire during drilling.
  • the rearward shank portion 134 merely freely rotates within the actuator mechanism 150.
  • the actuator mechanism 150 and the handle 170 do not rotate with the rearward shank portion 134, but remain essentially in one position due to the weight of the handle 170.
  • roller members 160 generally ride along the rearward facing impact surface 146, and may impact all of the impact protrusions 149, or impacts only higher portions of the impact protrusions 149, depending on the speed of rotation of the impact member 140 with respect with the actuator mechanism 150,
  • the height, radius of curvature, shape and number of teeth 148 will affect the frequency and amplitude of the impacts of the roller members 150 on the rearward facing impact surface 146.
  • the rearward ring member 145 maybe set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired.
  • the conventional drill bit 129 is caused to "hammer” into a piece of material as it rotates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or concrete. It should also be noted that the electric drill itself does not absorb the reaction of the impact of the roller members 160 on the teeth 148 of the rearward facing toothed surface 146.
  • a spring means 170 is operatively mounted between the actuator mechanism 150 and the main shaft 130 for biasing the actuator mechanism 150 to the forward forwardly displaced position. More specifically, the spring means 170 comprises a coil spring 170 that is operatively mounted between the actuator mechanism 150 and the impact member 140 through the main shaft 130. The back end of the coil spring 170 bears against a washer 153, which itself bears against the "C"-clip 160. The front end of the coil spring 170 bears against a roller bearing 151 securely seated within the actuator mechanism 150. In this manner, the coil spring 170 biases the actuator mechanism 150 through its forward forwardly displaced position. Accordingly, when the elongate main shaft 30 and the impact member 140 are rotated, the actuator mechanism 150 is rotated therewith. In use, the actuator mechanism 150 is moved slightly rearwardly to its forward forwardly displaced position against the force of the coil spring 170. Further rearward movement of the actuator mechanism 150 will cause the actuator mechanism 150 to move to its rearwardly displaced position.
  • a spring could bias the actuator mechanism 150 to its rearwardly displaced position. Accordingly, the actuator mechanism 150 does not rotate, or at least not substantially so, when the main shaft 130 is rotated during use. This is advantageous in that when the actuator mechanism 150 is grasped by an operator for use, it is not rotating, and is therefore more readily grasped.
  • FIGS 10 and 11 show a second preferred embodiment of the hammer drill bit chuck attachment of the present invention, as indicated by general reference numeral 220.
  • the second preferred embodiment hammer drill bit chuck attachment 220 is similar to the first preferred embodiment hammer drill bit chuck attachment 120 except that the rearward facing impact surface 246 is formed on a rearward ring member 245 that is secured to the main body portion 242.
  • the rearward ring member 245 may be set permanently in place by means of press-fitting or screw-fitting, or both, or maybe removably and replaceable so as to allow an end user to select the frequency and amplitude of impacts, as desired.
  • the second preferred embodiment also shows a protective sheath 247 disposed over the actuator mechanism 250.
  • the protective sheath 247 is preferably made from a suitable plastic material and is overmolded over the actuator mechanism 250.
  • the plastic protective sheath 247 insulates an operator's hand from potential electric shock if the drill bit (not specifically shown) happens to contact a live electrical wire during drilling.
  • the hammer drill bit chuck attachment 320 comprises amain shaft 330 having athreaded forward drill chuck end portion 332, an intermediate impact member receiving portion 333, and an elongate rearward shank portion 334.
  • the main shaft 330 defines a longitudinal axis "L" about which the main shaft 330 rotates.
  • a drill bit chuck 335 is mountable on the threaded forward drill chuck end portion 332 for rotation therewith.
  • the drill bit chuck 335 is preferably a conventional drill bit chuck and comprises three movable jaw members 336 that receive and retain a conventional drill bit 329 therein.
  • a ferrule member 337 surrounds the jaw members 336 and is wedged between the jaw members 336 and an outer housing 338 to keep the jaw members 336 locked in place on the conventional drill bit 329.
  • a base member 339 is secured in place within the outer housing 338 and the back end 336b of the jaw members 336.
  • the base member 339 has a threaded bore hole 339a that receives a co-operating threaded forward portion 334a of the rearward shank portion 334 in secure engagement.
  • the hammerdrill bit chuck attachment 320 comprises a main shaft 330, an impact member 340, and an adapter mechanism 350, as will be described in greater detail below.
  • An impact member 340 comprises a main body portion 342, a forwardly facing surface 345 and a rearwardly facing surface 346, and at least one impact portion.
  • the at least one impact member can be mounted on the actuator mechanism 350.
  • the at least one impact portion comprises a plurality of impact portions 348.
  • the plurality of ball bearings 348 rotatably mounted in the rearwardly facing surface 346 of the impact member 340.
  • the plurality of impact portions could comprise a plurality of impact indentations.
  • the impact member 340 is mounted in fixed relation on the main shaft 330 for rotation therewith, and projects radially outwardly from the intermediate impact member receiving portion 333.
  • the impact number 340 is slid over the elongate rearward shank portion 334 and is press-fit onto the intermediate impact member receiving portion 333 of the main shaft 330.
  • the intermediate impact member receiving portion 333 is a few thousandths of an inch larger in diameter than the elongate rear shank portion 334.
  • An actuator mechanism 350 having a forwardly facing surface 356 and a rearwardly facing surface 355 is mounted in freely rotatable relation on the rearward shank portion 334 of the main shaft 330, immediately rearwardly of the impact member 340, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement along the rearward shank portion 334.
  • the actuator mechanism 350 is retained on the rearward shank portion 334 by means of a "C"-cIip 360 securely engaged in an annular slot 362 in the rearward shank portion 334, that bears against a washer 361.
  • a second annular slot 362 is also included. Other suitable means may also be used.
  • the section of the rearward shank portion 334 disposed rearwardly of the actuator mechanism 350 must be of sufficient length to be securely received in the bit chuck of a conventional electric drill.
  • the actuator mechanism 350 is mounted on the rearward shank portion 334, as described above, for free rotation about the rearward shank portion 334 and for longitudinal sliding movement along the rearward shank portion 334 between a forward forwardly displaced position, as is best seen in Figures 12, 13, 14, 20 and 21, and a rearward rearwardly displaced position, as is best seen in Figure 28.
  • the "C"-clip 360 defines the rearward rearwardly displaced position of the actuator collar.
  • the actuator mechanism 350 has at least one roller member rotationally mounted thereon, and in the third preferred embodiment as illustrated, has at least one ball bearing 358 mounted thereon. More specifically, the at least one ball bearing 350 comprises a plurality (specifically twelve) ball bearings 358 rotationally mounted in the forwardly facing surface 356 of the actuator mechanism 350. The ball bearings 358 are rotationally mounted and otherwise positioned to engage the ball bearings 348 in the impact member 340, as will be discussed in greater detail subsequently.
  • the ball bearings 358 in the actuator mechanism 350 and the ball bearings 348 in the impact member 340 are each mounted within a co-operating cylindrical recess 349,359 having a diameter slightly greater than the diameter of the ball bearings 348,358, and a depth slightly less than the diameter of the ball bearings 348,358, so that the ball bearings 348,358 project outwardly from the cooperating recesses 349,359 respectfully.
  • the ball bearings 348,358 are each mounted within the co-operating recesses 349,359 by means of a suitable grease type material, so as to help retain the ball bearings 348,358 in place.
  • ball bearings 348,358 having a diameter of about 5/16" are suitable, although other sizes of ball bearings 348,358 could also be used. It has also been found that the ball bearings 348,358 of about this size should protrude beyond the rearwardly facing surface 346 of the impact member 340 and the forwardly facing surface 356 of the actuator mechanism 350, as the case may be, by up to about 0.050", or even more, and preferably by about 0.025", depending on the diameter of the ball bearings 348,358. Although the ball bearings 348 and the ball bearings 358 are shown to be the same diameter as each other, this is not absolutely necessary.
  • the actuator mechanism 350 Is thereby caused to move in a reciprocating motion between its forwardly displaced position and its rearwardly displaced position
  • the actuator mechanism 350 thereby imparts reciprocating motion along the longitudinal axis "L” to the drill bit chuck 335, to thereby transmit impact forces along the longitudinal axis "L” to the main shaft 350, and therefore to the conventional drill bit 329 retained therein.
  • the conventional drill bit 329 is caused to "hammer” into a piece of material as it rotates, thus causing a drill hole to be drilled readily even into hard materials, such as cement or concrete.
  • the plurality of ball bearings 348 and 358 are each rotationally mounted in evenly radially spaced relation around the longitudinal axis "L” to provide for an even impacting action. It should also be noted that the drill 322 itself does not absorb the reaction of the impact of the ball bearings 358 of the actuator mechanism 350 on the ball bearings 348 of the impact member 340.
  • the rearward shank portion 334 of the main shaft 330 merely freely rotates within the actuator mechanism 350, or alternatively, the actuator mechanism 350 merely freely rotates around the rearward shank portion 334 of the main shaft 330.
  • the third preferred embodiment hammer drill bit chuck attachment 320 further comprises an insulating cover 351 peripherally surrounding the actuator mechanism 350.
  • the insulating cover 351 is made from a synthetic rubber or plastic material, and is overmolded on the actuator mechanism 350.
  • the insulating cover 351 is used to electrically insulate the actuator mechanism 350 from a user's hand, when a user grasps the actuator mechanism 350 during use to preclude the actuator mechanism 350 from turning with the impact member 340, thus allowing the ball bearings 358 on the actuator mechanism 350 to impact the ball bearings 348 on the impact member 340, thereby imparting reciprocating motion along the longitudinal axis "L" to the main shaft 330. It has been found that grasping the insulating cover 351 permit for the accurate application of manual force along the longitudinal axis "L".
  • the third preferred embodiment hammer drill bit chuck attachment 320 permits bi-directional rotational operation of the elongate main shaft 330 and therefore the forward drill bit portion 332, although it would not be overly common to require the third preferred embodiment hammer drill bit 320 to operate it the reverse direction.
  • a manually manipulable handle 370 is removably connected to the actuator mechanism 350 by means of a threaded shaft 372 threadibly engaged in a co-operating threaded bore hole 371.
  • the handle 370 permits manual manipulation of the actuator mechanism 350 by a user's hand, so as to cause the longitudinal sliding movement of the actuator mechanism 350 between the forward forwardly displaced position and the rearward rearwardly displaced position.
  • the actuator mechanism 350 and the handle 370 do not rotate with the main shaft 330, but remain essentially in one position due to the weight of the handle 370.
  • FIG. 26 through 29 shows a fourth preferred embodiment of the hammer drill bit chuck attachment of the present invention, as indicated by general reference numeral 420.
  • the fourth preferred embodiment of the hammer drill bit chuck attachment 420 is similar to the third preferred embodiment of the hammer drill bit chuck attachment 320, except for the inclusion of a spring means 470 operatively mounted between the actuator collar 450 and the elongate main shaft 430 for biasing the actuator collar 450 to the forward forwardly displaced position.
  • the spring means 470 comprises a coil spring 470 that is operatively mounted between the actuator collar 450 and the stationary toothed collar 440.
  • the coil spring 470 sits within a recess 452 in the back end of the actuator collar 450, and surrounds the back end of the shank portion 434 of the elongate main shaft 430.
  • the coil spring 470 bears against the forward end 452a of the recess 452 and also bears against a washer 453, which itself bears against the "C"-clip 460.
  • the coil spring 470 biases the actuator collar through its forward forwardly displaced position and to its fully forward position. Accordingly, when the elongate main shaft 430 and the stationary toothed collar 440 are rotated, the actuator collar 450 is rotated therewith. In use, the actuator collar 450 is moved slightly rearwardly to its forward forwardly displaced position against the force of the coil spring 470.
  • the present invention provides a hammer drill bit chuck attachment that is inexpensive to manufacture, that is robust, wherein the frequency and amplitude of impacts can be adjusted or selected, wherein heat build up is minimized, and wherein an electric drill used in conjunction with the hammer drill bit chuck attachment can be operated at lower rotational speeds, all of which features are unknown in the prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Drilling And Boring (AREA)

Abstract

L'invention concerne un dispositif de serrage de trépan de marteau perforateur comprenant un arbre principal présentant une partie d'extrémité de serrage de trépan avant et une partie de tige arrière, et définissant un axe longitudinal. Un élément d'impact est monté dans une relation fixe sur l'arbre principal pour tourner avec celui-ci. Un mécanisme d'actionnement est monté sur l'arbre principal pour la rotation libre de l'arbre principal par rapport au mécanisme d'actionnement et pour le mouvement de coulissement longitudinal du mécanisme d'actionnement le long de l'arbre principal entre une position déplacée vers l'avant et une position déplacée vers l'arrière. Αu moins une partie d'impact est disposée soit sur l'élément d'impact, soit sur le mécanisme d'actionnement. Au moins un élément de rouleau est monté de façon rotative sur le composant parmi l'élément d'impact et le mécanisme d'actionnement qui ne comporte pas la partie d'impact. La rotation de l'arbre principal et de l'élément d'impact autour de l'axe longitudinal lorsque le mécanisme d'actionnement se trouve en engagement de transmission de force avec l'élément d'impact entraîne le déplacement du mécanisme d'actionnement dans un mouvement alternatif entre la position déplacée vers l'avant et la position déplacée vers l'arrière, et transmet des forces d'impact vers l'avant le long de l'axe longitudinal à l'arbre principal.
PCT/CA2007/001378 2006-08-08 2007-08-08 Dispositif de serrage de trépan de marteau perforateur WO2008017151A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA 2555533 CA2555533A1 (fr) 2006-08-08 2006-08-08 Accessoire de mandrin de trepan de marteau perforateur
CA2,555,533 2006-08-08

Publications (2)

Publication Number Publication Date
WO2008017151A2 true WO2008017151A2 (fr) 2008-02-14
WO2008017151A3 WO2008017151A3 (fr) 2008-05-08

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PCT/CA2007/001378 WO2008017151A2 (fr) 2006-08-08 2007-08-08 Dispositif de serrage de trépan de marteau perforateur

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CA (1) CA2555533A1 (fr)
WO (1) WO2008017151A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2471373A (en) * 2009-06-26 2010-12-29 Bosch Gmbh Robert Hammer action generation in a hand-held power tool

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ZA201902043B (en) * 2019-04-02 2019-11-27 Rhosch Eng Pty Ltd Drill steel and its manufacture

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EP0755756B1 (fr) * 1995-07-25 2000-01-05 Metabowerke GmbH & Co. Perçeuse portative avec dispositif de commutation entre un mode de fonctionnement "forage" et un mode "forage à percussion"
US6684964B2 (en) * 2002-06-17 2004-02-03 Bob B. Ha Hammer drill

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2471373A (en) * 2009-06-26 2010-12-29 Bosch Gmbh Robert Hammer action generation in a hand-held power tool
US20100326687A1 (en) * 2009-06-26 2010-12-30 Heiko Roehm Handheld power tool
CN101934516A (zh) * 2009-06-26 2011-01-05 罗伯特.博世有限公司 手持式电动工具
GB2471373B (en) * 2009-06-26 2011-08-31 Bosch Gmbh Robert Hammer action generation in a hand-held power tool
US10071467B2 (en) 2009-06-26 2018-09-11 Robert Bosch Gmbh Handheld power tool

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CA2555533A1 (fr) 2008-02-08

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