Coupler

1. A coupler, comprising:

(a) a body;

(b) a movable jaw;

(c) an actuator to move the movable jaw along a path of movement so as to engage a first pin of a work attachment; and

(d) a locking mechanism adapted to secure the jaw with respect to the body at different positions along the movable jaw's path of movement, and wherein the locking mechanism is formed from a plurality of recesses on the movable jaw or body, that are spaced apart along the jaw's path of movement, at least one locking member on the other of the movable jaw or body to the recesses, wherein the at least one locking member can engage recesses to secure the movable jaw with respect to the body, and wherein the actuator is connected to the locking member(s) so that deliberate expansion or contraction of the actuator moves the locking member(s) to a release position and also moves the moveable jaw.

2. The coupler of claim 1 , wherein the jaw is configured to slide with respect to the body.

3. The coupler of claim 2 , wherein the slide provides a rear jaw of the coupler and therefore the locking mechanism is configured to prevent the slide moving to a position in which it releases the first pin from the rear jaw of the coupler.

4. The coupler of claim 3 , wherein the body does not include structure to provide a fixed rear jaw of the body resulting in only the rear jaw of the coupler being provided by the movable jaw.

5. The coupler of claim 1 , wherein the locking mechanism is configured to secure the jaw in the case of loss of engagement force in the actuator.

6. The coupler of claim 1 , including at least one biasing element per locking member.

7. The coupler of claim 1 , wherein the locking mechanism includes at least one biasing element configured to urge the locking member(s) toward a locked position.

8. The coupler of claim 7 , wherein deliberate expansion or contraction of the actuator overcomes the biasing element so as to move the locking mechanism to the release position.

9. The coupler of claim 1 , wherein the actuator is configured to force the jaw along the path so as to retain the pin within the jaw.

10. A method of securing a work attachment to the coupler of claim 1 , the method comprising the steps of:

(a) positioning the coupler with respect to the work attachment;

(b) using the actuator to move the jaw along its path of movement so as to engage the first pin on the work attachment; and

(c) engaging the actuator to contract or expand to thereby move the jaw and to move the locking mechanism to the release position.

11. The method of claim 10 , further comprising the step of connecting the actuator to the locking mechanism so as to ensure that deliberate movement of the actuator moves the locking mechanism to a release position.

12. The coupler of claim 1 , wherein the recesses are in the body.

13. The coupler of claim 1 , wherein the locking member(s) are connected to the movable jaw.

14. The coupler of claim 1 , wherein the actuator comprises a hydraulic cylinder and ram, and wherein the cylinder provides having a first end and the ram provides a second end.

15. The coupler of claim 14 , wherein the actuator is connected to the locking member at an end of the second end that is distal to the cylinder.

16. The coupler of claim 1 , wherein when the locking mechanism is in the release position it allows the movable jaw to move with respect to the body.

17. The coupler of claim 1 , wherein the locking member is multi-centered.

18. The coupler of claim 1 , wherein the body includes a second jaw to receive a second pin on the work attachment.

19. The coupler of claim 18 , wherein the second jaw is fixed with respect to the body.

20. The coupler of claim 18 , wherein the second jaw is oriented to face in a direction substantially opposite the movable jaw.

21. The coupler of claim 18 , wherein the second jaw is a front jaw of the coupler.

22. The coupler of claim 1 , wherein the body includes a channel configured to receive a portion of the jaw.

23. The coupler of claim 22 , wherein the interaction of the channel and portion of the jaw received in the channel define the movable jaw's path of movement.

24. The coupler of claim 22 wherein the channel is defined by a pair of opposed surfaces inside a cavity within the main body.

25. The coupler of claim 24 , wherein the recesses are in a top surface of one of the opposed surfaces relative to the coupler's normal orientation of use.

26. The coupler of claim 1 , wherein when the locking mechanism is in the locking position it secures the jaw with respect to the body.