Grip activation system for firearm accessory

1. An accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the accessory comprising:

a grip force receiving surface;

a housing configured to position an electronic system, a control system, the grip force receiving surface and a linkage relative to the firearm, with the grip force receiving surface positioned proximate to the grip of the firearm such that a person gripping the firearm will apply force against the grip force receiving surface;

a tensioner positioned to apply a tension in the linkage urging the linkage and grip force receiving surface from a force applied position toward a release position;

wherein the grip force receiving surface is associated with the linkage such that a change in the grip force applied against the grip force receiving surface causes the linkage to cause a change in a condition that can be sensed by an actuation sensor that is at least a half of a length of the trigger guard away from the grip force receiving surface with the control system determining operation of the electronic system based at least in part on the condition sensed by the actuation sensor.

2. The accessory of claim 1 , wherein the tensioner comprises at least one of a spring, a resilient member and a resilient structure joined to the linkage to pull linkage such that grip force receiving surface is urged away from the grip.

3. The accessory of claim 1 , wherein the tensioner comprises a winding or coiling mechanism for winding or coiling the linkage.

4. The accessory of claim 1 , wherein the linkage comprises at least one of a film, cable, tape, wire, rope, chain other flexible connector.

5. The accessory of claim 1 , wherein a force applied to the grip force receiving surface causes the tensioner to move in a way that can be sensed by actuation sensor and used to determine that a force has been applied to the grip force receiving surface.

6. An accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the accessory comprising:

a grip force receiving surface;

a housing configured to position an electronic system, a control system, the grip force receiving surface and a linkage relative to the firearm, with the grip force receiving surface positioned proximate to the grip of the firearm such that a person gripping the firearm will apply force against the grip force receiving surface;

wherein the grip force receiving surface is associated with the linkage such that a change in the grip force applied against the grip force receiving surface causes the linkage to cause a change in a condition that can be sensed by an actuation sensor that is at least a half of a length of the trigger guard away from the grip force receiving surface with the control system determining operation of the electronic system based at least in part on the condition sensed by the actuation sensor and wherein the linkage is positioned within a pathway such that the linkage rocks in a manner that can be sensed by the actuation sensor when the gripping force is applied against the grip receiving surface.

7. An accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the accessory comprising:

a grip force receiving surface;

a housing configured to position an electronic system, a control system, the grip force receiving surface and a linkage relative to the firearm, with the grip force receiving surface positioned proximate to the grip of the firearm such that a person gripping the firearm will apply force against the grip force receiving surface;

a pathway containing a fluid and wherein the grip force applied against the grip receiving surface moves the fluid in a manner that can be sensed by the actuation sensor;

wherein the grip force receiving surface is associated with the linkage such that a change in the grip force applied against the grip force receiving surface causes the linkage to cause a change in a condition that can be sensed by an actuation sensor that is at least a half of a length of the trigger guard away from the grip force receiving surface with the control system determining operation of the electronic system based at least in part on the condition sensed by the actuation sensor.

8. An accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the accessory comprising:

a grip force receiving surface;

a housing configured to position an electronic system, a control system, the grip force receiving surface and a linkage relative to the firearm, with the grip force receiving surface positioned proximate to the grip of the firearm such that a person gripping the firearm will apply force against the grip force receiving surface;

wherein the grip force receiving surface is associated with the linkage such that a change in the grip force applied against the grip force receiving surface causes the linkage to cause a change in a condition that can be sensed by an actuation sensor that is at least a half of a length of the trigger guard away from the grip force receiving surface with the control system determining operation of the electronic system based at least in part on the condition sensed by the actuation sensor and wherein a first range of grip force applied to a grip force receiving surface causes the linkage to create a first condition that can be sensed by actuation sensor and from which the control system can determine a first control outcome and a second range of grip force applied to a grip force receiving surface creates a second condition that can be sensed by actuation sensor and from which the control system can determine a second control outcome.

9. The accessory of claim 8 , wherein further travel of the grip force receiving surface to a final position may be used to bring linkage into a position more proximate to actuation sensor so as to ensure that actuation sensor continues to send signals indicative of the second control outcome irrespective of minor changes in relative positioning that may arise as a function of inertial forces or accelerations that may occur during use.

10. An accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the accessory comprising:

a grip force receiving surface;

a housing configured to position an electronic system, a control system, the grip force receiving surface and a linkage relative to the firearm, with the grip force receiving surface positioned proximate to the grip of the firearm such that a person gripping the firearm will apply force against the grip force receiving surface;

wherein the grip force receiving surface is associated with the linkage such that a change in the grip force applied against the grip force receiving surface causes the linkage to cause a change in a condition that can be sensed by an actuation sensor that is at least a half of a length of the trigger guard away from the grip force receiving surface with the control system determining operation of the electronic system based at least in part on the condition sensed by the actuation sensor and wherein the linkage comprises a fluid material through a pathway such that force applied at grip force receiving surface pressurizes fluid in a chamber to create a change in conditions proximate to the actuation sensor.

11. The accessory of claim 10 , wherein the fluidically conveyed change comprises an application of force created in pathway against the actuation sensor.

12. A method for actuating an accessory for use with a firearm having a grip, a trigger guard and a barrel extending from the grip past the trigger guard, the method comprising:

receiving a grip force at a grip force receiving surface positioned at least one half of a trigger guard length away from an actuation sensor in the accessory;

using at least a portion of the grip force to create a change in a physical condition proximate to the actuation sensor that the actuation sensor is adapted to sense;

using the sensed change in physical condition to determine a control output for an electronic system in the firearm accessory wherein the portion of the grip force is used to change in a position of a linkage relative to the actuation sensor.