Chuck for airpump

1. A chuck for inflating a tire having a Presta valve, comprising:

a valve engagement device defining an aperture with a central axis and a diameter, the valve engagement device movable radially with respect to the central axis to increase and decrease the diameter of the aperture;

a locking device engaged with the valve engagement device to lock the valve engagement device in a selected radial position with respect to the central axis of the aperture;

a seal positioned within the valve engagement device, the entire seal moving radially with the valve engagement device;

wherein the seal is a multipart element; and

wherein the seal has a first end with a first diameter and a second end having a second diameter, wherein the first diameter is equal to the second diameter as the seal moves radially.

2. The chuck of claim 1 , wherein the seal includes two opposing, contoured portions each having a longitudinal axis, and wherein the longitudinal axis of each contoured portion is parallel to the central axis of the valve engagement device as the seal moves radially.

3. The chuck of claim 1 , wherein the valve engagement device and the locking device are secured to a grip having a lever to position the locking device.

4. The chuck of claim 2 , wherein the valve engagement device defines an air transfer chamber.

5. The chuck of claim 3 , wherein the grip defines an air inlet and an air passage to the air transfer chamber.

6. The chuck of claim 4 , further including a pump having an air outlet in communication with the air inlet of the grip.

7. A chuck for inflating a tire having a Presta valve, comprising:

a valve engagement device defining an aperture with a central axis and a diameter, the valve engagement device movable radially with respect to the central axis to increase and decrease the diameter of the aperture;

a locking device engaged with the valve engagement device to lock the valve engagement device in a selected radial position with respect to the central axis of the aperture;

wherein the locking device includes

a serpentine track

a pin disposed within the track,

a lever connected to the pin, wherein movement of the lever moves the pin within the track from a first position to a second position, and

a biasing element providing a lateral biasing force to the pin within the track.

8. A chuck for inflating a tire having a Presta valve, comprising: a valve engagement device defining an aperture with a central axis and a diameter, the valve engagement device movable radially with respect to the central axis to increase and decrease the diameter of the aperture;

a locking device engaged with the valve engagement device to lock the valve engagement device in a selected radial position with respect to the central axis of the aperture;

a seal positioned within the valve engagement device, the entire seal moving radially with the valve engagement device, wherein the seal has a first end with a first diameter and a second end having a second diameter, wherein the first diameter is equal to the second diameter as the seal moves radially, and wherein the seal includes two opposing, contoured portions each having a longitudinal axis, and wherein the longitudinal axis of each contoured portion is parallel to the central axis of the valve engagement device as the seal moves radially.

9. The chuck of claim 8 , wherein the locking device includes

a serpentine track

a pin disposed within the track,

a lever connected to the pin, wherein movement of the lever moves the pin within the track from a first position to a second position, and

a biasing element providing a lateral biasing force to the pin within the track.