GB2148722A

GB2148722A - Racket frame throat construction

Info

Publication number: GB2148722A
Application number: GB08329202A
Authority: GB
Inventors: Kun Nan Lo
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-11-02
Filing date: 1983-11-02
Publication date: 1985-06-05
Also published as: GB8329202D0

Abstract

A racket frame throat construction comprises a T-shaped tube member 10, having two transverse branch tube sections 12a and 12b for insertion of the ends of the looped member and a longitudinal tube section 20 extending from the peripheral wall of the transverse branch tube section for insertion of the end of the shaft, and is provided with means e.g. bores 15 for communicating said transverse branch and longitudinal branch tube sections 12a, 12b and 20, and means e.g. projections 14 for preventing ends of the looped member from twisting. <IMAGE>

Description

SPECIFICATION Racket frame throat construction This invention relates to racket frames, particularly to the throat construction of a racket frame which has a T-shaped tube of improved construction.

It is a common practice to provide a racket frame throat construction, as shown in Fig. 1, which includes a T-shaped tube member constituted of a transverse tube and a longitudinal tube to form a three-branch tube sections 1,2, and 3 for insertion of two ends 4,5 of the looped member and one end 6 of the shaft of the racket frame. Usually, three- branch tube sections are not communicated each other and therefore, when the ends of the looped member and the shaft are press fitted and adhesively bonded thereto, the air in the branching tube sections will induce a pressure to react upon the ends of the looped member and the shaft, thereby causing a great trouble in the processing.

As the transverse tube and the ends of the looped member are circular in their cross-sections, the looped member is easily subjected to twisting during processing.

An object of the invention is to provide a racket frame throat construction that connects ends of the looped member and the shaft in a firm and correct manner.

Another object of the invention is to provide a racket frame throat construction that will facilitate the insertion of the ends of the looped member.

The foregoing and other objects can be achieved through the provision of a racket frame throat which includes a T-shaped tube member having, a transverse tube provided with an internal partition member which divides it into two tube sections for insertion of two ends of the looped member of the racket frame, and a longitudinal tube extended from the peripheral wall of the transverse tube for insertion of one end of the shaft of the racket frame, characterised in that the partition member and the peripheral wall of the transverse tube is provided, with means for communicating the two tube sections and the longitudinal tube and preventing ends of the looped member from twisting.

Advantageously, the communicating means includes, a peg member passing through the partition member, and a mini tube member passing through the peripheral wall of the transverse tube.

The peg members are of non-circular crosssection. Preferably, the peg member is in a rectangular cross-section and has a circular hole.

When the ends of the looped member are inserted into two transverse tube sections, the looped member will not be caused twisted due to the engagement of their ends with the rectangular cross-section ofthe peg member.

There are further provided ridge members provided in the inner wall of the longitudinal tube so as to engage the peripheral surface of the end of the shaft, thereby improving the coupling of the shaft and the throat. Preferably, the ridges are extended from the peripheral wall of the transverse tube and are tapered to some extent.

This and other objects, features, advantageous of the present invention will be more apparent in the following description of a preferred embodiment with reference to the accompanying drawings, in which: Fig. 1 is a view showing a racket frame throat in the prior art; Fig. 2 is a partially sectioned view of a racket frame throat constructed according to the invention; Fig. 3 is a side elevation view of the racket frame throat of Fig. 2; Fig. 4 is a bottom view of the racket frame throat of Fig. 2; and Fig. 5 is a sectioned view taken from the line A-A of Fig. 2.

Referring to the drawings, there is shown a racket frame throat of T-shaped tube member which includes, a transverse tube 10 and a longitudinal tube 20 extended from the peripheral wall of the transverse tube 10. Inside the transverse tube 10 is provided a partition member 11 which divides the tube 10 into two transverse tube sections 12a and 1 2b for insertion of two ends of the looped member (not shown). The longitudinal tube 20 is adapted for insertion of one end of the shaft (not shown).

There is provided a peg member 14 of rectangular cross-section having a circular hole 14a passing through the partition member 11 so as to communicate the tube sections 12a and 12b. On the peripheral wall of the transverse tube 10 is provided a mini tube 15 to communicate the transverse tube 10 and the longitudinal tube 20, thereby minimizing the creation of the air pressure after insertion of the shaft and the looped member. As the peg member 14 is designed such that it is rectangular in its crosssection it will engage the inserted ends of the looped member to prevent their twisting displacement.

There are further provided ridges 16 on the inner surface of the wall of the longitudinal tube 20. These ridges 16 are extended from the peripheral wall of the transverse tube 10 and tapered to some extent.

These ridges 16 will render an additional engagement of the longitudinal tube 20 and the end of the shaft.

It can be appreciated that the provision of the rectangular section peg member 14 in the transverse tube 10 will provide the effective engagement with the ends of the looped member when the looped member is inserted into the transverse tube sections 12a and 12b in addition to the adhesive bonding of the ends of the looped member and the throat member. Further, the engagement with the peg 14 may prevent the tendency of the looped member to twist during insertion coupling. The provision of the ridges 16 may also effect the engagement with the end of the shaft after the shaft is inserted into the longitudinal tube 20.

With the invention thus explained, it is apparent that obvious modifications and variations can be made without departing from the scope of the invention. It is therefore intended that the invention be limited only as indicated in the appended claims.

Claims

1. A racket frame throat construction of the type including a T-shaped tube member having, a transverse tube provided with an internal partition member which divides it into two tube sections for connecting two ends of the looped member of the racket frame, and a longitudinal tube extended from the peripheral wall of the transverse tube for connecting to one end of the shaft of the racket frame, characterised in that the partition member and the peripheral wall of the transverse tube is provided with means for communicating the two tube sections and the longitudinal tube.

2. A racket frame throat construction as claimed in Claim 1, further including means for preventing ends of the looped member from twisting.

3. A racket frame throat construction as claimed in Claim 2, wherein said preventing means includes a peg member of non-circular cross-section passing through said partition member.

4. A racket frame throat construction as claimed in Claim 3, wherein said peg member is rectangular in its cross-section and has a circular hole.

5. A racket frame throat construction as claimed in Claim 4, said communicating means includes a mini tube passing through the wall of said transverse tube and provided in said longitudinal tube.

6. A racket frame throat construction as claimed in Claim 5, wherein said longitudinal tube includes ridge members provided in the inner wall thereof.

7. A racket frame throat construction as claimed in Claim 6, wherein the lengths of said ridge members begin from the peripheral wall of said transverse tube and are tapered to some extent.

8. A racket frame throat construction as substantially described hereinbefore with reference to the accompanying drawings.