Multi-mode drill with mode collar

• US 8,109,343 B2
• Filed: 06/29/2011
• Issued: 02/07/2012
• 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: Schroeder, James D., Bush, Dennis A., Trautner, Paul K.
• Primary Examiner(s): Nash, Brian D
• Application Number:
  US13/171,546
• Publication Number:
  US 20110253403A1
• Time in Patent Office: 223 Days
• Field of Search: 173/48, 173/47, 173/90, 173/104, 173/92, 173/93.7, 173/117, 173/122, 173/216, 173/217
• 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

1. A hammer-drill comprising:

a housing;

a motor and a non-rotatable hammer member coupled to the housing;

a parallel axis transmission coupled to the housing, the parallel axis transmission comprising;

a spur gear, a high speed gear, and a low speed gear positioned around an intermediate shaft;

a cooperating high speed gear, a cooperating low speed gear and a rotatable hammer member positioned around an output spindle;

a manually actuated rotary switch coupled to the housing and movable between a low speed position, a high speed position, and a hammer-drilling position;

wherein, when the manually actuated rotary switch is in the low speed position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the low speed gear, and the cooperating low speed gear while maintaining the non-rotatable hammer member and the rotatable hammer member in a non-contacting spaced-apart relationship;

wherein, when the manually actuated rotary switch is in the high speed position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the high speed gear, and the cooperating high speed gear while maintaining the non-rotatable hammer member and the rotatable hammer member in a non-contacting spaced-apart relationship; and

wherein, when the manually actuated rotary switch is in the hammer-drilling position, the manually actuated rotary switch is operably coupled to the parallel axis transmission to drivingly couple the motor to the output spindle through the spur gear, the high speed gear, and the cooperating high speed gear while allowing the rotatable hammer member to contact the non-rotatable hammer member to impart axial vibratory impacts to the output spindle;

wherein axial vibratory impacts are only imparted to the output spindle when the output spindle is drivingly coupled to the motor through the high speed gear and the cooperating high speed gear.

2. The hammer-drill according to claim 1, wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission through a shift fork which moves in an axial direction relative to the output spindle in response to the manually actuated rotary switch being moved between the low speed position and the high speed position.

3. The hammer-drill according to claim 2, wherein the shift fork remains in a substantially static axial position relative to the output spindle when the manually actuated rotary switch is moved between the high speed position and the hammer-drilling position.

4. The hammer-drill according to claim 2, wherein the manually actuated rotary switch is operably coupled to the shift fork through a shift pin.

5. The hammer-drill of claim 4, wherein the shift pin moves in an axial direction of the shift pin in response to movement of the manually actuated switch between the low speed position and the high speed position.

6. The hammer-drill according to claim 1, wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission through a shift fork which remains in a substantially static axial position relative to the output spindle when the manually actuated rotary switch is moved between the high speed position and the hammer-drilling position.

7. The hammer-drill according to claim 1, further comprising:

a first indicia comprising a “

1”

positioned to indicate when the manually actuated rotary switch is in the low speed position;

a second indicia comprising a “

2”

positioned to indicate when the manually actuated rotary switch is in the high speed position; and

a third indicia comprising a “

hammer”

icon positioned to indicate when the manually actuated rotary switch is in the hammer-drilling position.

8. The hammer-drill according to claim 1, wherein the manually actuated rotary switch rotates in a first rotary direction from the low speed position to a position adjacent the low speed position corresponding to the high speed position, and then continuing in the first rotary direction, rotates from the high speed position to a position adjacent the high speed position corresponding to the hammer-drilling position.

9. The hammer-drill according to claim 1, wherein the manually actuated rotary switch is operably coupled to a hammer shift component movable between a first position wherein teeth of the rotatable hammer member are permitted to contact teeth of the non-rotatable hammer member when the manually actuated rotary switch is in the hammer-drilling position and a second position wherein the teeth of the rotatable hammer member are prevented from contacting the teeth of the non-rotatable hammer member.

10. The hammer-drill according to claim 9, wherein the hammer shift component moves the non-rotatable hammer member in an axial direction relative to the output spindle.

11. The hammer-drill according to claim 1, wherein the manually actuated rotary switch defines a plurality of pockets that each correspond to one of the low speed position, the high speed position, and the hammer-drilling position, wherein a locating spring at least partially nests into one of the pockets in each position to positively locate the manually actuated rotary switch into the respective position.

12. A hammer-drill comprising:

a housing comprising a front housing member and a rear housing member, the front housing member and the rear housing member being coupled together via screws;

a motor disposed within the rear housing member;

a parallel axis transmission disposed within the front housing member;

an intermediate shaft of the parallel axis transmission having a spur gear, a first low speed gear, and a second high speed gear positioned around the intermediate shaft,

an output spindle of the parallel axis transmission having a second low speed gear, a second high speed gear, and a first ratchet wheel positioned around the output spindle;

a second ratchet wheel disposed within, and rotationally fixed in relation to, the front housing member, the second ratchet wheel surrounding the output spindle and facing the first ratchet wheel; and

a manually actuated rotary switch coupled to the front housing member and movable between;

a low speed position wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission to engage torque transfer from the motor through the spur gear, the first low speed gear, and the second low speed gear to rotatably drive the output spindle in a low speed mode;

a high speed position wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission to engage torque transfer from the motor through the spur gear, the first high speed gear and the second high speed gear to rotatably drive the output spindle in a high speed mode; and

a hammer-drilling position, wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission to engage torque transfer from the motor through the spur gear, the first high speed gear, and the second high speed gear to rotatably drive the output spindle in a high speed mode, and wherein the manually actuated rotary switch is operable to permit the first and second ratchet wheels to engage each other to impart axial an hammering motion to the output spindle in a hammer-drilling mode,

wherein the axial hammering motion is only imparted to the output spindle when torque transfer from the motor through the first high speed gear and the second high speed gear rotatably drive the output spindle in a high speed mode.

13. The hammer-drill according to claim 12, wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission through a shift fork which moves in an axial direction relative to the output spindle in response to the manually actuated rotary switch being moved between the low speed position and the high speed position.

14. The hammer-drill according to claim 13, wherein the shift fork remains in a substantially static axial position relative to the output spindle when the manually actuated rotary switch is moved between the high speed position and the hammer-drilling position.

15. The hammer-drill according to claim 13, wherein the manually actuated rotary switch is operably coupled to the shift fork through a shift pin.

16. The hammer-drill according to claim 12, wherein the manually actuated rotary switch is operably coupled to the parallel axis transmission through a shift fork which remains in a substantially static axial position relative to the output spindle when the manually actuated rotary switch is moved between the high speed position and the hammer-drilling position.

17. The hammer-drill according to claim 12, further comprising:

a first indicia comprising a “

1”

positioned to indicate when the manually actuated rotary switch is in the low speed position;

a second indicia comprising a “

2”

positioned to indicate when the manually actuated rotary switch is in the high speed position; and

a third indicia comprising a “

hammer”

icon positioned to indicate when the manually actuated rotary switch is in the hammer-drilling position.

18. The hammer-drill according to claim 12, wherein the manually actuated rotary switch rotates in a first rotary direction from the low speed position to a position adjacent the low speed position corresponding to the high speed position, and then continuing in the first rotary direction, rotates from the high speed position to a position adjacent the high speed position corresponding to the hammer-drilling position.

19. The hammer-drill according to claim 12, wherein the manually actuated rotary switch is operably coupled to a hammer shift component movable between a first position wherein teeth of the first ratchet wheel are permitted to contact teeth of the second ratchet wheel when the manually actuated rotary switch is in the hammer-drilling position and a second position wherein the teeth of the first ratchet wheel are prevented from contacting the teeth of the second ratchet wheel.

20. The hammer-drill according to claim 12, wherein the manually actuated rotary switch defines a plurality of pockets that each correspond to one of the low speed position, the high speed position, and the hammer-drilling position, wherein a locating spring at least partially nests into one of the pockets in each position to positively locate the manually actuated rotary switch into the respective position.