Connecting device for a gardening tool

A connecting device for gardening tool has a locking sleeve with a screw bolt and a tool head connector firmly secured in the locking sleeve by inserting the cubic part of the connector into the cubic portion of the locking sleeve and screwing the screw bolt on the locking sleeve. The connecting device allows gardening tool heads to be changed easily and conveniently to satisfy different requirements.

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What is claimed is:

1. A connecting device for a gardening tool comprising: a hollow locking sleeve having a port longitudinally defined in one end of the locking sleeve, a bolt ring formed onthe locking sleeve and having a pin receiver defined in the bolt ring, and a screw bolt detachably and securely mounted on the bolt ring, wherein the locking sleeve is adapted to be secured to a gardening shaft; and a tool head connector combined withthe locking sleeve and having a bore defined on one end of the tool head connector and adapted to be secured to a gardening tool head, an insert plugged into the port of the locking sleeve, and at least one pit defined in a surface of the insert and tomate with the screw bolt when attaching the tool head connector.

2. The connecting device for a gardening tool head as claimed in claim 1, wherein the pin receiver of the bolt ring has a threaded hole and the pin of the screw bolt has a thread formed to correspond to the threaded hole when attaching the toolhead connector.

3. The connecting device for a gardening tool as claimed in claim 2, wherein a flange is outwardly formed on a top of the pin receiver and the screw bolt has a chuck with a lip inwardly formed on the chuck, so as that when the screw bolt ismounted on the bolt ring, the flange and the lip engage with each other to retain the screw bolt on the locking sleeve.

4. The connecting device for a gardening tool as claimed in claim 2, wherein the port of the locking sleeve has a cubic portion and the insert on the tool head connector has a cubic part corresponding to the cubic portion, whereby after thecubic part is received in the cubic portion, a rotation of the tool head is avoided.

5. The connecting device for a gardening tool as claimed in claim 2, wherein the locking sleeve has multiple openings defined in the other end to vent air inside the locking sleeve when connecting the locking sleeve to the shaft of a gardeningtool.

6. The connecting device for a gardening tool as claimed in claim 2, wherein a tapered head is formed on a distal end of the pin to extend into the pit of the insert to firmly secured the tool head connector.

7. The connecting device for a gardening tool as claimed in claim 1, wherein a flange is outwardly formed on a top of the pin receiver and the screw bolt has a chuck with a lip inwardly formed on the chuck, so as that when the screw bolt ismounted on the bolt ring, the flange and the lip engage with each other to retain the screw bolt on the locking sleeve.

8. The connecting device for a gardening tool as claimed in claim 7, wherein the port of the locking sleeve has a cubic portion and the insert on the tool head connector has a cubic part corresponding to the cubic portion, whereby after thecubic part is received in the cubic portion, a rotation of the tool head is avoided.

9. The connecting device for a gardening tool as claimed in claim 7, wherein the locking sleeve has multiple openings defined in the other end to vent air inside the locking sleeve when connecting the locking sleeve to the shaft of a gardeningtool.

10. The connecting device for a gardening tool as claimed in claim 7, wherein a tapered head is formed on a distal end of the pin to extend into the pit of the insert to firmly secured the tool head connector.

11. The connecting device for a gardening tool as claimed in claim 1, wherein the port of the locking sleeve has a cubic portion and the insert on the tool head connector has a cubic part corresponding to the cubic portion, whereby after thecubic part is received in the cubic portion, a rotation of the tool head is avoided.

12. The connecting device for a gardening tool as claimed in claim 11, wherein the locking sleeve has multiple openings defined in the other end to vent air inside the locking sleeve when connecting the locking sleeve to the shaft of a gardeningtool.

13. The connecting device for a gardening tool as claimed in claim 11, wherein a tapered head is formed on a distal end of the pin to extend into the pit of the insert to firmly secured the tool head connector.

14. The connecting device for a gardening tool as claimed in claim 1, wherein the locking sleeve has multiple openings defined in the other end to vent air inside the locking sleeve when connecting the locking sleeve to the shaft of a gardeningtool.

15. The connecting device for a gardening tool as claimed in claim 14, wherein a tapered head is formed on a distal end of the pin to extend into the pit of the insert to firmly secured the tool head connector.

16. The connecting device for a gardening tool as claimed in claim 1, wherein a tapered head is formed on a distal end of the pin to extend into the pit of the insert to firmly secured the tool head connector.