Activation system having multi-angled arm and stall release mechanism

Patent metadata

Field	Value
Publication number	US-9744657-B2
Application number	US-201313844714-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Oct 4, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A power tool including an activation arm assembly having an actuator coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a roller, wherein actuation of the actuator causes the roller assembly to translate toward and engage the driver to initiate driving engagement between the driver and the flywheel; The activation arm assembly further includes a follower arm that engages the roller, the follower arm including a first mounting portion and a second mounting portion, the second mounting portion being pivotally coupled to the actuator and slidingly engaged with the carriage, the first mounting portion being biased in a direction toward the driver. The follower arm has a non-linear profile.

First claim

We claim:

1. A power tool comprising:
a structure;
a flywheel coupled to the structure;
a driver that is translatable along a driver axis; and
an activation arm assembly having an actuator having an actuation axis generally parallel to the driver axis, the actuator being coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a first roller and a second roller,
wherein actuation of the actuator causes the roller assembly to translate toward and engage the driver to initiate driving engagement between the driver and the flywheel,
wherein the activation arm assembly further includes a carriage, the carriage being fixedly coupled to the structure, the actuator being mounted on the carriage,
wherein the activation arm assembly further includes a first axle and a second axle, the first axle being received through a pivot slot formed in the carriage, the first axle and the second axle being coupled to the roller assembly, the first roller being mounted on the first axle and the second roller being mounted on the second axle,
wherein the activation arm assembly further includes a follower arm that engages the first roller, the follower arm including a first mounting portion and a second mounting portion, the second mounting portion being pivotally coupled to the actuator and slidingly engaged with the carriage, the first mounting portion being biased in a direction toward the driver, and
wherein the follower arm has a non-linear profile including:
a first surface having a linear plane and having a recess offset from the linear plane, in which the first roller engages the follower arm, the recess defining a first angle with respect to the actuation axis, and
a second surface defining a second angle with respect to the actuation axis.

2. The power tool according to claim 1 , wherein the first angle is 25 degrees with respect to the actuation axis and the second angle is 12 degrees with respect to the actuation axis.

3. The power tool according to claim 1 , wherein the actuator is received in the carriage.

4. The power tool according to claim 1 , wherein the actuator is engaged to the carriage in a snap-fit manner.

5. The power tool according to claim 1 , wherein the actuator is a solenoid having a body and a plunger, the plunger being movable along the actuation axis.

6. The power tool according to claim 1 , wherein the carriage includes a pair of arm members, each of the arm members including the pivot slot through which the first axle is received.

7. The power tool according to claim 1 , wherein the first roller is rotated about the first axle in a direction toward the first mounting portion of the follower arm when the second roller initially contacts the driver to drive the driver into driving engagement with the flywheel.

8. A power tool comprising:
a housing;
a structure disposed within the housing;
a flywheel coupled to the structure;
a driver that is translatable along a driver axis;
an activation arm assembly having an actuator coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a roller; and
a stall release lever comprising:
a lever arm mounted in a cantilevered manner to the activation arm assembly and extending outside of an outer surface of the housing;
a spool connected to the lever arm and mounted between the lever arm and a body of the activation arm assembly; and
a flange disposed around a portion of the spool,

wherein and the spool and the flange rotate with the lever arm, and
wherein the lever arm rotates about an axis perpendicular to the driver axis.

9. A power tool comprising:
a structure;
a flywheel coupled to the structure;
a driver that is translatable along a driver axis; and
an activation arm assembly having an actuator having an actuation axis generally parallel to the driver axis, the actuator being coupled to the activation arm assembly, the activation arm assembly being coupled to the structure and including a roller assembly having a first roller and a second roller,
wherein the activation arm assembly further includes a follower arm that engages the first roller, and
wherein the follower arm has a non-linear profile including:
a first surface having a linear plane and having a recess offset from the linear plane, in which the first roller engages the follower arm, the recess defining a first angle with respect to the actuation axis, and
a second surface defining a second angle with respect to the actuation axis.

10. The power tool according to claim 9 , wherein the first angle is 25 degrees with respect to the actuation axis and the second angle is 12 degrees with respect to the actuation axis.

11. The power tool according to claim 9 , wherein the actuator is a solenoid.

Assignees

• Black & Decker Inc

Inventors

• Baron Michael P
• Brendel Lee M

Classifications

• B25C5/15

  operated by electric power · CPC title

• B25C1/06 Primary

  operated by electric power · CPC title