Multi-mode drill with mode collar

• US 20090126957A1
• Filed: 11/21/2007
• Published: 05/21/2009
• Est. Priority Date: 11/21/2007
• Status: Active Grant

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Inventors: Bush, Dennis A., Schroeder, James D., Trautner, Paul K.
• Granted Patent: US 7,717,192 B2
• Time in Patent Office: Days
• US Class Current: 173/48
• CPC Class Codes: B25D 16/006 Mode changers; Mechanisms connected thereto
• CPC Class Codes: B25D 2211/064 Axial cams, e.g. two camming surfaces coaxial with drill spindle
• CPC Class Codes: B25D 2216/0023 Tools having a percussion-and-rotation mode
• CPC Class Codes: B25D 2216/0038 Tools having a rotation-only mode
• CPC Class Codes: B25D 2216/0084 Mode-changing mechanisms
• CPC Class Codes: B25D 2250/045 Cams used in percussive tools
• CPC Class Codes: B25D 2250/255 Switches
• CPC Class Codes: B25D 2250/351 Use of pins

Abstract

A drill includes a housing and a motor coupled to an output member by a transmission. The transmission can selectively couple the output member to an output spindle through a low speed output gear or a high speed output gear for rotating the output spindle at a first speed or a second speed, respectively. Alternatively or additionally, a low speed mode can be provided by actuating an electronic switch that limits the speed of the motor. A rotatably fixed hammer member and a rotatable hammer member can be mounted around the output spindle. A mode collar can be rotatably mounted on the, housing and around the output member for movement to positions that correspond to various mode of operation, including a low speed mode, a high speed mode, and a hammer-drilling mode. In the hammer-drilling mode, the transmission operates in the high speed mode.

Claims

10. A hammer-drill comprising:

a housing having a motor including an output member;

a rotary-reciprocatory output spindle journaled in the housing;

a parallel axis transmission disposed in the housing and including a first output gear and a second output gear, wherein 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 each mounted around the output spindle, the rotatable hammer member being 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; and

a manually actuated switch rotatably mounted on the housing and movable between a plurality of positions, each position corresponding to a mode of operation, wherein the modes of operation comprise;

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, wherein 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.

11. The hammer-drill of claim 10, further comprising a mechanical shift pin that communicates with the mode collar and the transmission, the mechanical shift pin translating in response to movement of the manually actuated switch between the low speed mode and the high speed mode.

12. The hammer-drill of claim 11 wherein the transmission further comprises a shift fork that selectively translates a shift ring along the spindle in response to translation of the mechanical shift pin.

13. The hammer-drill of claim 12 wherein the shift ring operably couples the output spindle to one of the first gear in the low speed mode or the second gear in the high speed mode.

14. The hammer-drill of claim 11, further comprising a cam having a cam arm, wherein rotation of the mode collar to the hammer-drilling mode urges the cam to rotate which thereby cooperates with the rotatably fixed hammer member to axially move the rotatably fixed hammer member into a position for engagement with the rotatable hammer member.

15. The hammer-drill of claim 13 wherein the mode collar defines a first ramp portion, wherein rotation of the manually actuated switch from the low speed mode to the high speed mode causes the mechanical shift pin to slidably traverse along the first ramp portion and thereby translate the shift fork to engage the shift ring with the second output gear.

16. The hammer-drill of claim 15 wherein the mechanical shift pin remains substantially static during rotation of the manually actuated switch between the high speed mode and the hammer-drilling mode.

17. The hammer-drill of claim 16 wherein the mechanical shift pin slidably traverses along a substantially planar surface defined on the manually actuated switch during rotation of the mode collar between the high speed mode and the hammer-drilling mode.

18. The hammer-drill of claim 15 wherein the manually actuated switch defines a plurality of pockets that correspond to the plurality of modes of operation, wherein a locating spring at least partially nests into one of the pockets in each of the corresponding modes of operation to positively locate the mode collar into the respective mode.

19. The hammer-drill of claim 10 wherein the modes of operation further comprise:

an electronic speed mode wherein an electronic shift pin translates an electronic speed switch that sends a signal to a controller, wherein the controller electronically limits output of the output spindle based upon the signal.

20. The hammer-drill of claim 19 wherein the manually actuated switch defines a second ramp portion, wherein rotation of the manually actuated switch from the low speed mode to the electronic low speed mode causes the electronic shift pin to traverse along the second ramp portion and thereby translate the electronic speed switch.

21. A hammer-drill comprising:

a housing having a motor including an output member;

an output spindle journaled in the housing to permit axial reciprocating movement thereof in a hammer mode;

a parallel axis transmission disposed in the housing and drivingly coupling the output member of the motor to the output spindle, the transmission including at least two speed modes;

a rotating hammer member that rotates with the output spindle and a non-rotating hammer member that does not rotate with the output spindle, the rotating hammer member cooperating with the non-rotating hammer member to cause axial reciprocating movement of the output spindle in the hammer mode; and

a mode collar rotatably mounted on the housing and around the output spindle;

a rearward cam surface facing axially toward the rear of the hammer drill coupled to the mode collar and rotating along with the mode collar during movement of the mode collar into one of the at least two speed modes; and

a forward cam surface facing axially toward the front of the hammer drill coupled to the mode collar and rotating along with the mode collar during movement of the mode collar into the hammer mode.

22. The hammer-drill of claim 21 wherein the mode collar is a single, integral component including the forward cam surface, the rearward cam surface, or both.

23. The hammer-drill of claim 21 further comprising a cam follower linking the rearward cam surface with a speed shift component movable between a first position wherein the output spindle rotates at a low speed and a second position wherein the output spindle rotates at a high speed.

24. The hammer-drill of claim 23 wherein a shift ring is coupled to a low speed gear mounted on the output spindle when the shift component is in the first position, and the shift ring is coupled to a high speed gear mounted on the output spindle when the shift component is in the second position,

25. The hammer-drill of claim 21 further comprising a cam follower linking the forward cam surface with a hammer shift component movable between a first position wherein teeth of the rotating hammer member are permitted to contact teeth of the non-rotating hammer member in the hammer mode and a second position wherein the teeth of the rotating hammer member are prevented from contacting the teeth of the non-rotating hammer member.

26. The hammer-drill of claim 25 wherein the forward cam surface is located on a separate cam member linked to the mode collar via a cam arm, and wherein the cam follower is a cam surface located on the non-rotating hammer member.

27. A hammer-drill comprising:

a housing having a motor including an output member;

a rotary-reciprocatory output spindle journaled in the housing;

a parallel axis transmission disposed in the housing and driven by the output member, the transmission including 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 rotably fixed hammer member and a rotatable hammer member each mounted around the output spindle, the movable hammer member cooperating with the fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode;

a mechanical speed shift pin that communicates with the shift sub-assembly;

an electronic speed shift pin that communicates with an electronic speed switch that sends a signal to a controller, thereby providing an additional speed mode; and

a mode collar rotatably mounted on the housing and around the output spindle, the mode collar associated with a first cam surface linked to the shift sub-assembly through the mechanical speed shift pin, and the mode collar associated with a second cam surface linked to an electronic switch through the electronic speed shift pin, and the mode collar associated with a third cam surface rotable with the mode collar into a hammer position wherein engagement of the rotating hammer teeth with non-rotating hammer teeth is permitted and the third cam surface being rotable with the mode collar into a non-hammer position, wherein engagement of the rotating hammer teeth with non-rotating hammer teeth is prevented.

1. A hammer-drill comprising:

a housing having a motor including an output member;

a rotary-reciprocatory output spindle journaled in the housing;

a transmission disposed in the housing and driven by the output member, the transmission being 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 each mounted around the output spindle, the movable hammer member cooperating with the fixed hammer member to deliver vibratory impacts to the output spindle in a hammer-drilling mode; and

a mode collar rotatably mounted on the housing and around the output spindle, the mode collar being movable between a plurality of positions, each position corresponding to a mode of operation, wherein the modes of operation comprise;

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, wherein in the hammer-drilling mode the output spindle is driven in the high speed mode.

2. The hammer-drill of claim 1, further comprising a mechanical shift pin that communicates with the mode collar and the transmission, the mechanical shift pin translating in response to movement of the mode collar between the low speed mode and the high speed mode.

3. The hammer-drill of claim 2 wherein the transmission further comprises a shift fork that selectively translates a shift ring along the spindle in response to actuation of the mechanical shift pin.

4. The hammer-drill of claim 3 wherein the shift ring operably couples the output spindle to one of a first gear in the low speed mode or a second gear in the high speed mode.

5. The hammer-drill of claim 2, further comprising a cam having a cam arm, wherein rotation of the mode collar to the hammer-drilling mode urges the cam to rotate and thereby urge the movable hammer member into engagement with the fixed hammer member.

6. The hammer-drill of claim 4 wherein the mode collar defines a first ramp portion, wherein rotation of the mode collar from the low speed mode to the high speed mode causes the mechanical shift pin to slidably traverse along the first ramp portion and thereby translate the shift fork to engage the shift ring with the second output gear.

7. The hammer-drill of claim 6 wherein the mechanical shift pin remains substantially static upon rotation of the mode collar between the high speed mode and the hammer-drilling mode.

8. The hammer-drill of claim 1 wherein the mode collar is coupled to an electronic switch that sends a signal to a controller to limit the speed of the motor, thereby providing the low speed mode when the mode collar is in the low speed mode position.

9. The hammer-drill of claim 8, wherein rotation of the mode collar from the low speed mode to the electronic speed mode causes the electronic shift pin to traverse along a second ramp portion and thereby translate the electronic low speed switch.

28. The hammer-drill of claim 27 wherein the mode collar is movable between a plurality of positions, each position corresponding to a mode of operation, wherein the modes of operation comprise:

an electronic speed mode wherein the mechanical and electronic speed shift pins are translated by the first and second ramp, respectively and output spindle is driven in the additional speed;

a low speed mode wherein the mechanical speed shift pin is translated by the first ramp and the output spindle is driven in the first low speed;

a high speed mode wherein the output spindle is driven in the second high speed; and

the hammer-drilling mode.

29. The hammer-drill of claim 27 wherein the first cam surface faces towards a rear of the hammer drill and is an integral component on an interior of the mode collar.

30. The hammer-drill of claim 27 wherein the second cam surface faces towards a rear of the hammer drill and is an integral component on an interior of the mode collar.

31. The hammer-drill of claim 27 wherein the third cam surface faces towards a front of the hammer drill and is a separate component operably coupled to the mode collar, the separate component being mounted radially inside the mode collar and around the output spindle.

31-1. The hammer-drill of claim 27 wherein the first cam surface faces towards a rear of the hammer drill and is an integral component on an interior of the mode collar;

wherein the second cam surface faces towards a rear of the hammer drill and is an integral component on an interior of the mode collar; and

wherein the third cam surface faces towards a front of the hammer drill and is a separate component operably coupled to the mode collar, the separate component being mounted radially inside the mode collar and around the output spindle