Hand tool having a head which is position-adjustable and lockable relative to a handle

1. A hand tool comprising:

a head and a handle, the head being pivotally connected to the handle permitting a position of the head to be varied relative to the handle, and the head comprising a collar that has at least one outwardly extending tab; and

a locking mechanism configured to permit a user to selectively fix a position of the head relative to the handle, the locking mechanism comprising a sleeve that has a recess corresponding to each tab, the sleeve being mounted on the handle, the sleeve being movable between at least a first position and a second position, the sleeve in the first position permitting the head to be moved relative to the handle, and the at least one tab of the collar being positioned in a corresponding recess of the sleeve when the sleeve is in the second position limiting movement of the head relative to the handle.

2. The hand tool in accordance with claim 1 wherein the head comprises a body having a ratchet drive.

3. The hand tool in accordance with claim 1 wherein, the head is pivotally connected to the handle at a joint, the sleeve in the second position extending over the joint.

4. The hand tool in accordance with claim 3 wherein the joint comprises a pin pivotally connecting the head and the handle.

5. A hand tool comprising:

a handle;

a head pivotally connecting to the handle at a joint permitting a position of the head to be varied relative to the handle;

a sleeve mounted on the handle, the sleeve being movable between at least a first position, a second position, and a third position;

a primary locking mechanism configured to permit a user to selectively fix a position of the head relative to the handle, the primary locking mechanism comprising at least one first locking member associated with the handle configured to be moved into and out of engagement with the head; and

a secondary locking mechanism configured to additionally fix a position of the head relative to the handle;

wherein the sleeve in the first position does not engage the primary or secondary locking mechanisms and the head is permitted to rotate relative to the handle, the sleeve in the second position engages the primary locking mechanism and the secondary locking mechanism, and the sleeve in the third position engages the primary locking mechanism but not the secondary locking mechanism.

6. The hand tool in accordance with claim 5 wherein the at least one first locking member comprises at least one ball which is configured to selectively engage a detent in the head.

7. The hand tool in accordance with claim 5 wherein the head comprises a collar and the sleeve engages the collar when in the second position.

8. The hand tool in accordance with claim 7 wherein the collar has at least one outwardly extending tab and the sleeve has a recess corresponding to each tab, the at least one tab of the collar being positioned in a corresponding recess of the sleeve when the sleeve is in the second position.

9. The hand tool in accordance with claim 5 wherein the head comprises a body having a ratchet drive.

10. The hand tool in accordance with claim 5 wherein the head is pivotally connected to the handle at a joint, and the sleeve in the second position extends over the joint.

11. The hand tool in accordance with claim 5 , wherein the primary locking mechanism comprises an actuator and at least one plunger, the at least one plunger being biased into contact with the head, the actuator in a first position permitting movement of the at least one plunger, the first position being an unlocked position of the primary locking mechanism, the actuator in a second position restricting movement of the at least one plunger, and the second position being a locked position of the primary locking mechanism.

12. A hand tool comprising:

a handle;

a head pivotally connected to the handle at a joint permitting a position of the head to be varied relative to the handle;

a primary locking mechanism configured to permit a user to selectively fix a position of the head relative to the handle, the primary locking mechanism comprising an actuator, at least one plunger, and a ball corresponding to each plunger, the at least one plunger and each associated ball being biased towards an unlocked position, the actuator in a first position permitting the at least one plunger and each associated ball to move to the unlocked position, and the actuator in a second position pressing the at least one plunger and each associated ball to a locking position in which each ball engages the head, and

a secondary locking mechanism configured to additionally fix a position of the head relative to the handle, the secondary locking mechanism comprising a sleeve mounted on the handle, the sleeve being movable between at least a first position and a second position, the sleeve in the second position engaging at least a portion of the head and limiting movement of the head relative to the handle.

13. The hand tool in accordance with claim 12 wherein the sleeve engages the actuator.

14. The hand tool in accordance with claim 13 wherein the actuator has at least one projection for engagement by an inner surface of the sleeve.

15. The hand tool in accordance with claim 14 wherein the head comprises a plurality of spaced detents which permit the head to be locked to the handle in at least two different positions.