The present disclosure relates to a multi-mode hammer drill, and more particularly to a multi-mode drill with a mode collar for selecting between various modes of operation.
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
Multi-mode hammer drills generally include a floating rotary-reciprocatory output spindle journaled in the housing for driving a suitable tool bit coupled thereto. In operation, the spindle can be retracted axially within the housing and against the force of a suitable resilient means, upon engagement of the tool bit with a workpiece and a manual bias force exerted by the operator on the tool. A non-rotating hammer member can be secured in the housing, and a rotating hammer member can be carried by the spindle. The movable hammer member can have a ratcheting engagement with the fixed hammer member to impart a series of vibratory impacts to the spindle in a “hammer-drilling” mode of operation. A shiftable member can act upon the spindle to change from a “drilling” mode to the “hammer-drilling” mode, and vice versa. In the drilling mode, the cooperating hammer members are spaced too far apart and hence do not engage each other. Multi-mode hammer drills also generally include a transmission that has multiple speed modes in order to dive the output spindle at different speeds.
A hammer-drill includes a housing having a motor including an output member. A rotary-reciprocatory output spindle is journaled in the housing. A transmission is disposed in the housing and driven by the output member. The transmission is operable to rotate the output spindle at a first low speed or at a second high speed. A rotatably fixed hammer member and a rotatable hammer member are each mounted around the output spindle. The movable hammer member cooperates with the fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode. A mode collar is rotatably mounted on the housing and around the output spindle. The mode collar is movable between a plurality of positions, each position corresponding to a mode of operation. The modes of operation include: a low speed mode wherein the output spindle is driven in the low speed; a high speed mode wherein the output spindle is driven in the high speed; and the hammer-drilling mode. In the hammer-drilling mode the output spindle is driven in the high speed mode.
A hammer-drill includes a housing having a motor including an output member. A rotary-reciprocatory output spindle is journaled in the housing. A parallel axis transmission is disposed in the housing and includes a first output gear and a second output gear. The transmission selectively couples the output member to the output spindle through one of the first output gear or the second output gear for rotating the output spindle at one of a first speed or a second speed, respectively. A rotatably fixed hammer member and a rotatable hammer member are each mounted around the output spindle. The rotatable hammer member is mounted on the spindle to rotate therewith. The rotatable hammer member cooperating with the rotatably fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode. A manually actuatable rotary switch is mounted on the housing. The manually actuatable rotary switch is movable between a plurality of positions, each position corresponding to a mode of operation. The modes of operation include: a low speed mode wherein the first output gear is coupled for rotation with the output spindle; a high speed mode wherein the second output gear is coupled for rotation with the output spindle; and the hammer-drilling mode. The hammer-drilling mode is only selectable when the second output gear is coupled for rotation with the output spindle in the high speed mode.
A hammer-drill includes a housing having a motor including an output member. A rotary-reciprocatory output spindle is journaled in the housing to permit axial reciprocating movement thereof in a hammer mode. A parallel axis transmission is disposed in the housing and drivingly couples the output member of the motor to the output spindle. The transmission including at least two speed modes. A rotating hammer member rotates with the output spindle and a non-rotating hammer member does not rotate with the output spindle. The rotating hammer member cooperates with the non-rotating hammer member to cause axial reciprocating movement of the output spindle in the hammer mode. A mode collar is rotatably mounted on the housing and around the output spindle. A rearward cam surface faces axially toward the rear of the hammer drill and is coupled to the mode collar and rotates along with the mode collar during movement of the mode collar into one of the at least two speed modes. A forward cam surface faces axially toward the front of the hammer drill and is coupled to the mode collar and rotates along with the mode collar during movement of the mode collar into the hammer mode.
A hammer-drill includes a housing having a motor including an output member. A rotary-reciprocatory output spindle is journaled in the housing. A parallel axis transmission is disposed in the housing and driven by the output member. The transmission includes a shift sub-assembly that shifts between a first position wherein the output spindle rotates at a first low speed and a second position wherein the output spindle rotates at a second high speed. A rotatably fixed hammer member and a rotatable hammer member are each mounted around the output spindle. The movable hammer member cooperates with the fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode. A mechanical speed shift pin communicates with the shift sub-assembly. An electronic speed shift pin communicates with an electronic speed switch that sends a signal to a controller, thereby providing an additional low speed mode. A mode collar is rotatably mounted on the housing and around the output spindle. The mode collar is associated with a first cam surface linked to the shift sub-assembly through the mechanical speed shift pin. The mode collar is associated with a second cam surface linked to an electronic switch through the electronic speed shift pin. The mode collar is associated with a third cam surface rotatable with the mode collar into a hammer position wherein engagement of the rotating hammer teeth with non-rotating hammer teeth is permitted. The third cam surface is also rotatable with the mode collar into a non-hammer position, wherein engagement of the rotating hammer teeth with non-rotating hammer teeth is prevented.
Further areas of applicability will become apparent from the description provided herein. It should be understood that the description and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way.
With initial reference to
In general, the rearward housing 14 covers a motor 20 (
The output spindle 40 can be a floating rotary-reciprocatory output spindle journaled in the housing 12. The output spindle 40 is driven by the motor 20 (
Turning now to
The inboard surface 46 of the mode collar 26 can define a plurality of pockets therearound. In the example shown, four pockets 62, 64, 66, and 68, respectively (
With specific reference now to FIGS. 3 and 6-9, the mode collar 26 communicates with a mechanical speed shift pin 90 and an electronic speed shift pin 92. More specifically, a distal tip 94 (
As can be appreciated, the respective ramps 76 and 82 facilitate transition between the respective valleys 74 and 80 and plateaus 78 and 84. As will become more fully appreciated from the following discussion, movement of the distal tip 96 of the electronic speed shift pin 92 between the electronic shift pin valley 80 and plateau 84 influences axial translation of the electronic speed shift pin 92. Likewise, movement of the distal tip 94 of the mechanical speed shift pin 90 between the mechanical shift pin valley 74 and plateau 78 influences axial translation of the mechanical speed shift pin 90.
Turning now to
A spring 108 is provided to forwardly bias the output spindle 40 as shown in
Referring to
Located on each hammer support rod 254 is a return spring 256. The return spring 256 is a biasing member acting upon the non-rotating hammer member to bias the non-rotating hammer toward the non-hammer mode position. The proximal end of each hammer support rod 254 can be press-fit into one of a plurality of first recesses 260 in the forward housing 16. This forward housing 16 can be the gear case housing. This forward housing 16 can be wholly or partially made of aluminum. Alternatively, the forward housing 16 can be wholly or partially made of plastic or other relatively soft material. The plurality of first recesses can be located in the relatively soft material of the forward housing 16. The distal end of each hammer support rod 254 can be clearance fit into one of a plurality of second recesses 262 in the end cap 28. The end cap 28 can be wholly or partially made of a material which is similar to that of the forward housing 16. Thus, the plurality of second recesses 262 of the end cap 28 can be located in the relatively soft material. The end cap 28 is attached to the forward housing member 16 with a plurality of fasteners 264 which can be screws.
The support rods 254 can be made of hardened steel. Alternatively, the support rods 254 can be made of another suitable hard material, so that the support rods are able to resist inappropriate wear which might otherwise be caused by the axially movable hammer member 100, during hammer operation. The hammer members 100, 102 can be made of the same material as the support rods 254. To resist wear between the support rods 254 (which can be of a relatively hard material) and the recesses 260, 262 (which can be of a relatively soft material), the recesses 260, 262 can have a combined depth so they can together accommodate at least about 25% of the total axial length of the support rod 254; or alternatively, at least about 30% the length. In addition, press-fit recesses 260 can have a depth so it accommodates at least about 18% of the total axial length of the support rod 254; or alternatively, at least about 25% of the length. Further, each of the recesses 260, 262 can have a depth of at least about 12% of the axial length of the support rod 254.
Thus, the hammer member 100 is permitted limited axial movement, but not permitted to rotate with the axial spindle 40. The support rods 254 can provide the rotational resistance necessary to support the hammer member 100 during hammer operation. As a result, the projections 250 of the typically harder hammer member 100 can avoid impacting upon and damaging the groove 266 walls of the forward housing 16. This can permit the use of an aluminum, plastic, or other material to form the forward housing 16.
On the side of hammer member 100 opposite ratcheting teeth 104, a cam 112 having a cam arm 114 and a series of ramps 116 is rotatably disposed axially adjacent to the axially movable hammer member 100. During rotation of the mode collar 26 into the “hammer-drill” mode, the cam arm 114 is engaged and thereby rotated by the hammer cam drive rib 86 (
With continued reference to
The shift fork 128 slidably translates along a static shift rod 144 upon axial translation of the mechanical speed shift pin 90. A first compliance spring 146 is disposed around the static shift rod 144 between the shift bracket 132 and the shift fork 128. A second compliance spring 148 is disposed around the static shift rod 144 between the shift bracket 132 and a cover plate 150. The first and second compliance springs 146 and 148 urge the shift fork 128 to locate the shift ring 130 at the desired location against the respective low or high output gear 120 or 122, respectively. In this way, in the event that during shifting the respective pins 140 are not aligned with the respective detents, rotation of the low and high output gears 120 and 122 and urging of the shift fork 128 by the respective compliance springs 146 and 148 will allow the pins 140 to will be urged into the next available detents upon operation of the tool and rotation of the gears 120, 122. In sum, the shift sub-assembly 124 can allow for initial misalignment between the shift ring 130 and the output gears 120 and 122.
An output member 152 of the motor 20 (
With specific reference now to
Concurrently, the mechanical speed shift pin 90 is located on the mechanical shift pin plateau 78 of the mode collar 26 (see also
In the “hammer-drill” mode, however, the respective axially movable and hammer member 100 is axially moved into a position where it can be engaged with rotating hammer member 102. Specifically, the manual application of pressure against a workpiece (not seen), the output spindle moves axially back against biasing spring 108. This axial movement of the output spindle 40 carries the rotating hammer member 102 is sufficient that, since the axially movable hammer member 100 has been moved axially forward, the ratchets 104, 106 of the hammer members 100 and 102, respectively, are engagable with each other. Moreover, selection of the “hammer-drill” mode automatically defaults the shift sub-assembly 124 to a position corresponding to the mechanical high speed setting simply by rotation of the mode collar 26 to the “hammer-drill” setting 56 and without any other required actuation or settings initiated by the user. In other words, the mode collar 26 is configured such that the hammer mode can only be implemented when the tool is in a high speed setting.
With reference now to
In the position shown in
Of note, the slide member 188 is arranged to actuate in a transverse direction relative to the axis of the output spindle 40. As a result, inadvertent translation of the slide member 188 is reduced. Explained further, reciprocal movement of the hammer-drill 10 along the axis 30 may result during normal use of the hammer-drill 10 (i.e., such as by engagement of the hammer members 100 and 102 while in the “hammer-drill” mode, or other movement during normal drilling operations). By mounting the electronic speed shift switch 178 transverse to the output spindle 40, inadvertent translation of the slide member 188 can be minimized.
As shown from
Referring now to
The gear case housing 149 defines an outer surface 179. It is understood that the outer surface 179 of the gear case housing 149 partially defines the overall outer surface of the hammer-drill 10. In other words, the outer surface 179 is exposed to allow a user to hold and grip the outer surface 179 during use of the hammer-drill 10.
The cover plate 150 is coupled to the gear case housing 149 via a plurality of first fasteners 151. As shown in
The forward housing 16 and the rearward housing 14 are coupled via a plurality of second fasteners 159 (
Also, in the embodiment shown, the cover plate 150 can include a plurality of pockets 155. The pockets 155 can be provided such that the heads of the first fasteners 151 are disposed beneath an outer surface 157 of the cover plate 150. As such, the first fasteners 151 are unlikely to interfere with the coupling of the rearward and forward housings 14, 16.
The cover plate 150 also includes a plurality of projections 163 that extend from the outer surface 157. The projections 163 extend into the rearward housing 14 to ensure proper orientation of the forward housing 16. The cover plate 150 further includes a first aperture 165. The output member 152 of the motor 20 extends through the aperture 165 to thereby rotatably couple to the first reduction gear 154 (
Also, as shown in
As shown in
Furthermore, as described above and seen in
The configuration of the cover plate 150 and the outer shell 149 of the forward housing 16 allows the transmission 22 to be contained independent of the other components of the hammer-drill 10. As such, manufacture of the hammer-drill 10 can be facilitated because the transmission 22 can be assembled substantially separate from the other components, and the forward housing 16 can then be subsequently coupled to the rearward housing 14 for added manufacturing flexibility and reduced manufacturing time.
Furthermore, the cover plate 150 can support several components including, for instance, the output spindle 40 the static shift rod 144 and the electronic shift rod 92. In addition, several springs can be biased against the cover plate, for instance, compliance spring 148 and spring 180. Thus, proper orientation of these components are ensured before the rearward housing 14 and the forward housing 16 are coupled. In addition, the cover plate 150 holds the transmission and shift components and various springs in place against the biasing forces of the springs. As such, the cover plate 150 facilitates assembly of the hammer-drill 10.
Referring now to
As shown in
The base 223 of the clutch member 221 extends axially through the bore of the low output gear 220 such that the low output gear 220 is supported by the clutch member 221 on the spindle 40. The low output gear 220 can be supported for sliding axial movement along the base 223 of the clutch member 221. Also, the low output gear 220 can be supported for rotation on the base 223 of the clutch member 221. As such, the low output gear 220 can be supported for axial movement and for rotation relative to the spindle 40′.
The transmission 22 also includes a retaining member 231. In the embodiment shown, the retaining member 231 is generally ring-shaped and disposed within a groove 233 provided on an end of the base 223. As such, the retaining member 231 is fixed in an axial position relative to the first axial surface 227 of the base 223.
The transmission 22 further includes a biasing member 235. The biasing member 235 can be a disc spring or a conical (i.e., Belleville) spring. The biasing member 235 is supported on the base 223 between the retaining member 231 and the low output gear 220. As such, the biasing member 235 biases a face 236 of the low output clutch 220 against the face 227 of the base 223 by pressing against the retaining member 231 and low output gear 220.
The clutch member 221 also includes at least one aperture 241 (
Furthermore, the head 225 of the clutch member 221 includes a plurality of ratchet teeth 237 on the first axial surface 227 thereof, and the low output gear 220 includes a plurality of corresponding ratchet teeth 239 that selectively mesh with the ratchet teeth 237 of the clutch member 221. More specifically, as shown in
As shown in
When the hammer-drill 10 is in the low speed setting (electrical or mechanical) and torque transferred between the low output gear 220 and the clutch member 221 is below the predetermined threshold amount, the corresponding cam surfaces 245, 249 remain in abutting contact to allow the torque transfer. However, when the torque exceeds the predetermined threshold amount (e.g., when the drill bit becomes stuck in the workpiece), the cam surfaces 245 of the clutch member 221 cam against the cam surfaces 249 of the low output gear 220 to thereby move (i.e., cam) the low output gear 220 axially away from the clutch member 221 against the biasing force of the biasing member 235. As such, torque transfer between the clutch member 221 to the low output gear 220 is interrupted and reduced.
It will be appreciated that the clutch member 221 limits the torque transfer between the output member 152 of the motor 20 and the spindle 40 to a predetermined threshold. It will also be appreciated that when the hammer-drill 10 is in the mechanical high speed setting, torque transfers between the second reduction pinion 258 and the spindle 40 via the high output gear 222, and the clutch member 221 is bypassed. However, the gear ratio in the mechanical high speed setting can be such that the maximum torque transferred via the high output gear 222 is less than the predetermined threshold. In other words, the transmission 22 can be inherently torque-limited (below the predetermined threshold level) when the high output gear 222 provides torque transfer.
Thus, the clutch member 221 protects the transmission 22 from damage due to excessive torque transfer. Also, the hammer-drill 10 is easier to use because the hammer-drill 10 is unlikely to violently jerk in the hands of the user due to excessive torque transfer. Furthermore, the transmission 22 is relatively compact and easy to assemble since the clutch member 221 occupies a relatively small amount of space and because only one clutch member 221 is necessary. Additionally, the transmission 22 is relatively simple in operation since only the low output gear 220 is clutched by the clutch member 221. Moreover, in one embodiment, the hammer-drill 10 includes a pusher chuck for attachment of a drill bit (not shown), and because of the torque limiting provided by the clutch member 221, the pusher chuck is unlikely to over-tighten on the drill bit, making the drill bit easier to remove from the pusher chuck.
Additional locking details of the shifting mechanism are illustrated in
The static shift rod 144 operates as a support member for supporting the shift bracket 132. The shift bracket 132 or shift member is mounted on the static shift rod 144 in a configuration permitting movement of the shift member along the outer surface of the shift rod between a first mode position corresponding to a first mode of operation and a second mode position corresponding to a second mode of operation. The shift bracket 132 can also mounted on the static shift rod 144 in a configuration permitting limited rotational or perpendicular (to the shift surface) movement between a lock position and an unlock position in a direction that is substantially perpendicular to the shift surface. As illustrated, the shift bracket includes two apertures 282, 284 through which the static shift rod 144 extends. At least one of the apertures 282 can be slightly larger than the diameter of the static shift rod to allow the limited rotational or perpendicular movement of the shift bracket 144.
A groove 268 can be located in the static shift rod 144. The groove 268 has a sloped front surface 272 and a back surface 274 that is substantially perpendicular to the axis of the static shift rod 144. Located on the static shift rod 144 and coupled to the shift bracket 132 is a lock spring member 276. The lock spring 276 fits into an opening 278 in the shift bracket 132, so that the lock spring 276 moves along the axis of the static shift rod 144 together with the shift bracket 132. Thus, when return spring 148 moves the shift bracket 132 into the high speed gear position, the shift bracket 132 aligns with the groove 268. The lock spring 276 exerts a force in a direction of arrow X, which pushes the shift bracket 132 into the groove 268.
The biasing force in the direction of arrow X provided by the lock spring 276 retains the shift bracket 132 in the groove 268. In combination with the perpendicular back surface 274 of the groove 268, which operates with the shift bracket 132 to provide cooperating lock surfaces, the lock spring 276 prevents shift bracket 132 from moving backwards along the static shift rod 144 during hammer mode operation. In this way, the axial forces that are repeatedly exerted on the transmission during hammer mode operation can be resisted by the shifting mechanism.
When shifting out of the high speed gear mode, shift pin 90 operates as an actuation member and exerts a force in the direction of arrow Y. Since this force is offset from the surface of the static shift rod 144, upon which the shift bracket 132 is mounted, this force exerts a moment on the shift bracket 132; thereby providing a force in the direction of arrow Z. This force along arrow Z exceeds the biasing spring force along arrow X, which causes the shift bracket 132 to move out of the groove 268; thereby allowing movement into the low speed gear mode. The locking spring member 276 includes a protrusion 280 which extends into a cooperating opening 282 of the shift bracket 132 to prevent the opposite side of the shift bracket 132 from entering the groove 268 in response to the force in the direction of arrow Z. The protrusion 280 can be in the form of a lip.
For clarity, the direction of the force along arrow X is perpendicular to the axis of the static shift rod 144 and toward the force along arrow Y. The direction of the force along arrow Z is opposite to that of arrow X. The direction of the force along arrow Y is parallel to the axis of the static shift rod 144 and toward the force along arrow X. In addition, the force along arrow Y is spaced away from the axis of the static shift rod 144, so that its exertion on shift bracket 132 generates a moment that results in the force along arrow Z, which opposes the force along arrow X.
While the disclosure has been described in the specification and illustrated in the drawings with reference to various embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the disclosure as defined in the claims. Furthermore, the mixing and matching of features, elements and/or functions between various embodiments is expressly contemplated herein so that one of ordinary skill in the art would appreciate from this disclosure that features, elements and/or functions of one embodiment may be incorporated into another embodiment as appropriate, unless described otherwise above. Moreover, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the essential scope thereof. Therefore, it is intended that the disclosure not be limited to the particular embodiment illustrated by the drawings and described in the specification as the best mode presently contemplated for carrying out this disclosure, but that the disclosure will include any embodiments falling within the foregoing description and the appended claims.
This application is a continuation of U.S. patent application Ser. No. 12/767,145 filed Apr. 26, 2010 and now issued as U.S. Pat. No. 7,987,920 on Aug. 2, 2011, which is a divisional application of U.S. patent application Ser. No. 11/986,686 filed Nov. 21, 2007 and now issued as U.S. Pat. No. 7,717,192 on May 18, 2010. The disclosures of the above applications are incorporated herein by reference.
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Number | Date | Country | |
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