GB2149047A

GB2149047A - Connecting arrangement

Info

Publication number: GB2149047A
Application number: GB08426585A
Authority: GB
Inventors: Brian Laurance Wright
Original assignee: Individual
Current assignee: Individual
Priority date: 1983-10-29
Filing date: 1984-10-19
Publication date: 1985-06-05
Also published as: GB8426585D0; GB2149047B

Abstract

A connecting arrangement comprises at least one connecting rod 1 having at one or each end a connecting stud 2. The stud has a head portion at its free end and an adjacent neck portion which leads into the head portion through an inclined shoulder. A spherical or part-spherical connecting member 10 has one or a plurality of bores disposed on its surface and extending into the spherical or part-spherical member from its surface for receiving the connecting studs at the end of the connecting rods. One or a plurality of threaded bores 14 each intersect a respective one of the stud receiving bores and locate a grub screw 15, the arrangement being such that as a said grub screw is screwed into its bore it engages said shoulder on the stud to draw said rod into said bore. Various means can be provided for preventing rotation of the connecting rods about their own axes. <IMAGE>

Description

SPECIFICATION Connecting arrangement This invention relates to connecting arrangements for inter-connecting rods or the like.

According to the invention a connecting arrangement comprises at least one connecting rod having at one or each end a connecting stud, the stud having a head portion at its free end and an adjcent neck portion which leads into the head portion through an inclined shoulder, and a spherical or part-spherical connecting member having one or a plurality of bores disposed on the surface of the connecting member and extending into the spherical member from its surface for receiving the connecting stud at the end of the connecting rod and one or a plurality of threaded bores each of which intersects a respective one of the stud receiving bores and locates a grub screw, the arrangement being such that as a said grub screw is screwed into its bore it engages said shoulder on the stud to draw said stud into said bore.

Various connecting arrangements in accordance with the invention will now be described by way of example with reference to the accompanying drawings, in which Figure 1 is a plan view of a connecting member of a first arrangement, Figure 2 is a section through the connecting member Figure 3 is a view partly in section of a connecting rod of the first arrangement, and Figure 4 is a view of the connecting member and connecting rod assembled together to form the connecting arrangement.

Figure 5 is a view of a second connecting arrangement, Figure 6 is a view of a third connecting arrangement, Figure 7 is a view of a fourth connecting arrangement, Figure 8 is a view of a fifth connecting arrangement, Figure 9 is a view of a sixth connecting arrangement.

In the various connecting arrangements to be described, the same reference numerals have been used to designate corresponding parts.

Referring now to Figs. 1 to 4 of the drawings, connecting rod 1 has connecting studs 2 projecting axially from each end. The studs 2 are formed as parts of plugs 21 which plug into the ends of a tube 22 to form the connecting rod 1. Each of these studs 2 comprises a head portion 3 at its free end, an adjacent neck portion 4 which leads into the head portion 3 through sloping shoulder 5 and a body portion 6 which connects with the neck portion 3 through sloping shoulder 7.

The connecting member 10 is a complete sphere and has four blind bores 11 which extend from the surface towards the centre of the sphere on the equator, so to speak, of the sphere, the axes of the bores 11 being at right-angles to each other and two further bores 1 2 which extend from the North and South poles. The bores 1 2 could be replaced by a single through bore. The connecting member 10 also has a plurality of threaded bores 14 each of which intersects a respective one of the bores 11 and 1 2 and locates a grub screw 1 5.

Thus when the stud 2 of a connecting rod is pushed into one of the bores 11 and 1 2 it can be locked in position by the grub screw located in the intersecting bore 14. The dimensioning is such that the inner end of grub screw 1 5 engages the shoulder 5, so that the further the grub screw is screwed into the engagement the more it rides down the shoulder 5 and the more the stud 2 is pulled into the bore until it, the rod 1, is solidly locked against the surface of the connecting member 10.

The rods 1 and their studs 2 as well as the connecting members 10 can be made from plastics material or metal as desired.

Referring now to Fig. 5. a connecting arrangement is shown which is similar in principle to that previously described. However in this arrangement the stud receiving bores 11 and 1 2 meet each other at the centre of the spherical connecting member 10 so that in effect several diametrical through bores are provided.

The studs 2 of Fig. 5 are longer than the studs 2 of Fig. 3 and also the end face 23 of each stud 2 is chamfered so that it is at 45 to the axis of the stud 2. Thus when two rods 1 are fitted into bores 11 and 1 2 which extend at right-angles to each other the studs 2 abut each other in a mitred joint ensuring a fixed relative disposition of the two rods. Also the rods are prevented from rotating about their own axes by the abutment of their end faces.

Refferring to Fig. 6, the connecting member 10 has bores 11 and 1 2 which meet each other at the centre of the connecting member as in Fig. 5 to provide in effect several diametrical through bores. This arrangement differs from the arrangement of Fig. 5 in that the ends of the studs 2 are pointed by providing the end of each stud 2 with two chamfered faces 24 which extend at 45 to the axis of the stud. Thus when four rods 1 are fitted into respective bores 11 the ends of the studs interfit to ensure a fixed relative disposition of the four rods 1 and to prevent them rotating about their own axes.

Fig. 7 shows a connecting arrangement similar to that shown in Figs. 1 to 4 in that it has a connecting member 10 with blind bores 11 and 1 2 into which the studs 2 at the ends of connecting rods 1 can be fitted. The connecting arrangement differs from that shown in Figs. 1 to 4 in that the ends of the studs 2 are provided with transverse grooves 26 and a pin 27 extends across each of the bores 11 and 12. Thus when the stud 2 on a rod 1 is pushed into a bore 11 or 1 2 in the appropriate orientation the pin 27 engages in the slot 26 so that rotation of the rod 1 about its own axis relative to the connecting member 10 is prevented.

Fig. 8 shows a connecting arrangement which is similar in principle to that of Fig. 7 in that the ends of the studs 2 are provided with transverse grooves 26. However in the arrangement of Fig. 8 the bores 11 are through bores and a block 28 is located at the centre of the connecting member 10 and is fixed in position by a screw 29 whose head is accessible through the bottom of one of the blind bores 1 2. The block has tongues 30 for locating in the grooves 26 at the ends of the studs 2.

Fig. 9 shows a further connecting arrangement in which a rod 1 is prevented from rotating about it own axis relative to a connecting member.

In this arrangement slots 32 extend from both sides of the bores 11 at the surface of the connecting member 10 and webs 33 are provided on the ends of the rods 1 for engagement in the slots 32 when the studs 2 are pushed into the bores 11.

As will be appreciated a whole range of two and three dimensional frames can be built up from a set of the connecting members and rods. Also special fittings can be provided, these fittings having a stud similar to that shown on the rod 1. Such fittings can be designed for various purposes, such as clamps which clamp a table top or a length of shelving at its supporting points, canopy fixings, lamp holders and multitude of other purposes.

Claims

1. A connecting arrangement comprising at least one connecting rod having at one or each end a connecting stud, the stud having a head portion at its free end and an adjacent neck portion which leads into the head portion through an inclined shoulder, and a spherical or part-spherical connecting member having one or a plurality of bores disposed on the surface of the connecting member and extending into the spherical member from its surface for receiving the connecting stud at the end of the connecting rod and one or a plurality of threaded bores each of which intersects a respective one of the stud receiving bores and locates a grub screw, the arrangement being such that as a said grub screw is screwed into its bore it engages said shoulder on the stud to draw said stud into said bore.

2. A connecting arrangement according to claim 1, wherein the connecting member has at least two stud receiving bores which intersect each other and the end faces at the free ends of the studs of connecting rods fitted into said two bores abut each other, said end faces extending obliquely to the axes of the studs.

3. A connecting arrangement according to claim 2 and having four intersecting stud receiving bores, the end face of each stud having two surfaces which extend obliquely to the axis of the stud so that said end face can abut corresponding oblique surfaces of the studs of two connecting rods fitted into another two of said bores.

4. A connecting arrangement according to claim 1, wherein the end face at the free end of the stud of each of said connecting rods is arranged to co-operate with a device fitted into the bore received by said stud, whereby the connecting rod is prevented from rotating about its own axis relatively to the connecting member.

5. A connecting arrangement according to claim 4, wherein the said end face is provided with a slot for locating with a pin or tongue located in the bore.

6. A connecting arrangement according to claim 1, wherein the end of the connecting rod is provided with webs which fit into slots extending transversely from said bores on the surface of the connecting member, whereby the connecting rod is prevented from rotating about its own axis relatively to the connecting member.