MULTI-MODE DRILL WITH MODE COLLAR

• US 20100206591A1
• Filed: 04/26/2010
• Published: 08/19/2010
• 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 7,987,920 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

1. 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.

2. The hammer-drill of claim 1 wherein the mode collar is a single, integral component including the forward cam surface, the rearward cam surface, or both.

3. The hammer-drill of claim 1 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.

4. The hammer-drill of claim 3 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,

5. The hammer-drill of claim 1 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.

6. The hammer-drill of claim 5 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.