Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
SHAFT FOR A TOOL
Document Type and Number:
WIPO Patent Application WO/2003/068459
Kind Code:
A1
Abstract:
A composite shaft (10) for a tool includes an elongate metal section (16) surrounded by a polymeric section with the elongate metal section having engaging means (20) at its opposite ends.

More Like This:
Inventors:
LANE COLIN ROBERT (AU)
Application Number:
PCT/IB2003/000487
Publication Date:
August 21, 2003
Filing Date:
February 14, 2003
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
LANE COLIN ROBERT (AU)
International Classes:
B25G1/12; A62B3/00; (IPC1-7): B25G1/12; A62B3/00
Foreign References:
FR1411886A1965-09-24
US5799996A1998-09-01
US5951078A1999-09-14
US4039012A1977-08-02
US3770033A1973-11-06
Attorney, Agent or Firm:
Moubray, Hugh Robert (PO Box, 2024 Craighall, ZA)
Download PDF:
Claims:
CLAIMS
1. A composite shaft for a tool including an elongate metal section surrounded by a polymeric section with the elongate metal section having engaging means at its opposite ends.
2. The composite shaft of claim 1 wherein the opposite ends of the elongate metal shaft are enlarged relative to an intermediate portion of the elongate metal shaft.
3. The composite shaft of claim 2 wherein the enlarged ends of the elongate metal shaft both comprise sockets or a socket and a spigot.
4. The composite shaft of claim 3 including a deformable washer secured to at least one of the ends of the elongate metal section.
5. The composite shaft of claim 1 wherein the elongate metal section includes at least one groove and wherein the polymeric section includes at least one ridge which locates within the groove.
6. The composite shaft of claim 5 wherein the elongate metal section includes a plurality of longitudinally extending grooves and wherein the polymeric section includes a plurality of longitudinally extending ridges complementary in shape to the grooves and located within the grooves.
7. The composite shaft of claim 6 wherein the elongate metal section has four grooves and wherein the polymeric section has four ridges.
8. The composite shaft of claim 1 wherein the elongate metal section is made of steel.
9. The composite shaft of claim 1 wherein the polymeric section is moulded over the elongate metal section.
10. The composite shaft of claim 1 wherein the polymeric section is made of polyethylene.
11. The composite shaft of claim 1 includes at least one hole extending transversely through the composite shaft.
12. The composite shaft of claim 1 wherein the polymeric section is a heat and electrical insulator.
13. A composite shaft substantially as herein described and illustrated with reference to the accompanying drawings.
14. A tool kit including a composite shaft as claimed in any one of claims 1 to 13.
Description:
SHAFT FOR A TOOL FIELD OF THE INVENTION This invention relates to a shaft for a tool.

BACKGROUND TO THE INVENTION PCT/IB99/01896 describes an aluminium shaft for a tool. The shaft has a tube with insert swaged at its opposite ends. One of the inserts has a threaded socket and the other of the inserts has a threaded spigot so that two shafts can be connected end-to-end to form a longer shaft. A handle can be connected to one end of the longer shaft and a tool head can be connected to the other end of the longer shaft to form a tool.

The shaft suffers from the disadvantage that the aluminium shaft is a conductor of heat and electricity. Consequently when a tool incorporating the shaft is used for example as an axe by a fireman, it is possible that the shaft could become too hot to hold and/or that holding the shaft could result in an electric shock.

SUMMARY OF THE INVENTION According to the invention a composite shaft for a tool includes an elongate metal section surrounded by a polymeric section with the elongate metal section having engaging means at its opposite ends.

Preferably the opposite ends of the elongate metal shaft are enlarged relative to an intermediate portion of the elongate metal shaft.

The enlarged ends of the elongate metal shaft preferably both comprise sockets or a socket and a spigot.

The composite shaft preferably includes a deformable washer secured to at least one of the ends of the elongate metal section.

The elongate metal section preferably includes at least one groove and the polymeric section preferably includes at least one ridge which locates within the groove. Preferably the elongate metal section has a plurality of longitudinally extending grooves and the polymeric section has a plurality of longitudinally extending ridges complementary in shape to the grooves and located within the grooves. The elongate metal section may have four grooves and the polymeric section may have four ridges.

The elongate metal section is preferably made of steel.

The polymeric section is preferably moulded over the elongate metal section and it may be made of polyethylene.

The composite shaft may include at least one hole extending transversely through the composite shaft.

The polymeric section is preferably a heat and an electrical insulator.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional side view of a composite shaft according to the invention; Figure 2 is a cross-sectional side view of another embodiment of a composite shaft according to the invention; Figure 3 is a cross-sectional end view on line 111-111 of figure 2; Figure 4 is a plan view of a tool kit; Figure 5 is an assembled plan view of an axe; and Figure 6 is an assembled plan view of a spade.

DETAILED DESCRIPTION OF THE DRAWINGS A composite shaft 10 for a tool in the form of an axe 12 or spade 14 has a stainless steel section 16 surrounded by or encased within a polyethylene section 18. The steel section 16 has an exposed threaded socket 20 at each of its ends.

The diameter of the steel section 16 is reduced between the two threaded sockets 20 to form an intermediate section 21. Four circumferentially spaced grooves 22 are provided in the intermediate section 21. The polyethylene section 18 has four longitudinally extending ridges 24 which are of complementary shape to the grooves 22 and are located within the grooves 22.

A hole 26 extends through the shaft 10.

Deformable washers 28 are adhered to the free ends of each socket 20.

Referring now to figure 2, a shaft 30 is similar to the shaft 10 except that the shaft has a threaded spigot 32 at one of its ends.

The axe 12 and the spade 14 can be formed from a tool kit 34 shown in figure 4. The tool kit consists of handles 36,38, shafts 10 and 30, spade head 40, axe head 44 and two tightening pins 42. The tightening pins 42 can be inserted into the holes 26 to tighten the parts of a tool together.

The polyethylene provides an electrical and thermal barrier to the steel section.

It will be appreciated that many modifications or variations of the invention are possible without departing from the spirit or scope of the invention.