Angle head tripod

A stand for a camera comprises a tripod which pivotally supports a camera mounting pillar 8. The camera mounting pillar 8 is formed with a pivoting lockable joint 18 which allows the camera to be positioned with a greater amount of flexibility at levels close to the ground than is possible with just a ball joint. The camera mounting column 8 and one of the tripod legs can be separated from the stand and joined together to form a monopod which can be folded about the pivoting joint 18 for compact carriage.

BACKGROUND OF THE INVENTION 
This invention relates to tripods, and particularly to tripods for 
photographic use. It is particularly, although not exclusively applicable 
to tripods of the kind having a mounting head with an arcuate bolt 
carrying an article supporting bracket for mounting, and a plurality of 
wedge shaped spaces between the pivots at the top ends of the tripod legs. 
A tripod of this kind is described in our International Patent Application 
No. PCT/GB 91/01404, which relates to a tripod having a head with a 
slidable, article supporting pillar or centre column mounted on the head 
in a pillar guide which includes a pivotal bracket for attachment to the 
arcuate bolt, so that the pillar can be pivoted from a vertical to a 
horizontal position. 
In normal use, a camera will be mounted on a tripod bush at one end of the 
centre column, by means of a ball and socket head, and thus, if the column 
is pivoted to a horizontal position, and the tripod legs are opened to a 
wide angle, it is possible to arrange the camera to be positioned close to 
the ground for "low angle" shoots. However, manipulation of the ball and 
socket head becomes very difficult in such positions, because in general, 
when the axis of ball and socket head is horizontal and its mounting is 
turned through 90.degree., i.e., so that the tripod bush is vertical, 
there is almost no further adjustability of position available from the 
ball and socket head. 
SUMMARY OF THE INVENTION 
Accordingly, the present invention seeks to provide a stand for a camera 
comprising a ground engageable support structure capable of supporting a 
pivotally mounted camera mounting pillar, a camera mounting member capable 
of being mounted on an end of said camera mounting pillar to mount a 
camera, characterised in that the camera mounting pillar is formed of two 
elongate members joined by a lockable pivoting joint. 
Because the mounting pillar is jointed near the or each end upon which the 
camera is to be mounted, the end portion can be turned to a position in 
which it is at right angles to the axis of the other portion of the 
mounting pillar. In one embodiment, the or each end of the mounting pillar 
is provided with two mounting attachments, such as tripod screws of a 
known type, one of which projects axially from the end of the mounting 
pillar, whilst the other projects at right angles to it. 
Preferably the portions of the mounting pillar are separable and the tripod 
is provided with at least one detachable leg which is adapted to be 
attached to one of the separable portions of the mounting pillar so as to 
form a monopod. For this purpose, the joint may include connection means 
which enable one part of the pillar to be removed and to be replaced by 
the tripod leg. 
The invention also extends to a jointing device for a tubular tripod leg or 
mounting pillar of a tripod, comprising a spigot adapted to be fitted into 
the end of a tubular leg or pillar member, and a pivot disc having a pivot 
axis which is at right angles to the spigot axis and is offset therefrom, 
the pivot disc having one face which is adapted to mate with the 
corresponding face of the pivot disc of a second jointing member, whereby 
two such jointing members can be pivotally connected together by their 
pivot discs, in such a way that the two spigots are pivotable, relative to 
one another, through 180.degree.; between a co-axial position, and a 
side-by-side, parallel position. 
Preferably, the mating faces of the pivot discs are toothed so that they 
can be locked into a desired angular relationship. 
Preferably, the or each jointing member is provided with attachment means 
for a carrying strap, and one or both ends of the mounting pillar may also 
be provided with such attachment means, as described in our above 
mentioned co-pending International Patent Application, so as to enable a 
carrying strap to be connected, either between the two ends of the central 
pillar, or between one end of the pillar and one of the jointing members, 
when the apparatus is configured as a monopod. 
Accordingly, the invention also extends to a foldable monopod, comprising 
two tubular members connected together by a central pivoting joint, and 
including a first carrying strap attachment means at the joint, and a 
second carrying strap attachment means at the other end of one of the 
tubular members, to facilitate carrying the monopod in its folded 
condition. 
In the above mentioned alternative embodiment of the invention, in which 
one end of the mounting pillar carries two tripod screws arranged at right 
angles to one another, the mounting pillar is preferably provided with a 
head having two flattened camera supporting surfaces arranged at right 
angles to one another, with a respective tripod screw arranged at the 
central portion of each surface. Preferably, the head also includes 
carrying strap attachment means on one side thereof, opposite to one of 
the supporting surfaces. 
Preferably, in order to enable the apparatus to be used in a very low 
position, when it is configured as a tripod, the co-operating surfaces of 
the leg pivots and any intervening spacers for example the wedge shaped 
spacers shown in our above mentioned International Patent Application, are 
provided with fine radial knurling milling, so as to aid stability of the 
tripod particularly when the legs are spread widely apart, for low level 
camera work. 
Some embodiments of the invention will now be described by way of example, 
with reference to the accompanying drawings:

DETAILED DESCRIPTION OF THE INVENTION 
Referring to FIG. 1, the tripod 2 illustrated by way of example, is of the 
type of whose mounting head comprises an arcuate bolt and plurality of 
wedge shaped spacers carried on the bolt, between pivot members at the top 
ends of each tripod leg. It will be appreciated, however, that the exact 
type of jointing method at the head of the tripod, is not critical to the 
primary features of the invention. 
A tubular pillar guide 4 is pivotally mounted at 6 on the same arcuate bolt 
that carries the three leg heads, and a centre column or mounting pillar 8 
is slidable in the pillar guide 4, so that the height of a camera mounted 
on one end of the centre column can be varied. As illustrated, the head 10 
of the centre column has a tripod screw 12 on the top surface, and also an 
attachment ring 14 on one side, for attachment of the carrying strap. The 
latter arrangement is illustrated in more detail, in our International 
Patent Application No. PCT/GB 91/01404. 
As illustrated in FIG. 2, when the tripod legs are opened out widely for 
"low angle" use, it is, of course, still possible to mount a ball and 
socket head 16, co-axially with the column, by means of an axial screw 
such as that illustrated at 12 in FIG. 1. However, the control of camera 
position and angle is then very restricted, and in practice it is rather 
difficult to position the camera, for example, in an accurate horizontal 
position. 
Accordingly, the centre column 8 is provided with a pivotable joint 18, 
shown in a pivoted position in FIG. 1a, near one end of the column 8, so 
that, as illustrated in FIG. 2, the head 10 at that end of the column can 
be moved to a substantially vertical position, even when the column is 
horizontal, thereby allowing the full range of adjustability of a ball and 
socket head 16 mounted on that end. 
One of the legs 22 of the tripod, FIG. 1, may also be made removable from 
its corresponding "leg head", and the joint 18 is also so constructed that 
the column tube can be removed from it. This enables a "monopod" to be 
constructed from the leg 22 and the upper part of the column 8 carrying 
the camera support head 10, as illustrated in FIG. 3. 
The pivotable joint 18 is provided with a lug 24 on each of its two 
sections, for the attachment of one end of a carrying strap, whilst the 
head 10 also carries a similar lug 14, as mentioned above with reference 
to FIG. 1, and as in illustrated in FIG. 4, this enables the monopod of 
FIG. 3 to be folded in half and have a carrying strap 26 attached, for 
easy portability. 
FIG. 5 illustrates the construction of the joint 18 in more detail, and 
this comprises a pair of identical castings 30, which include a dependent 
"spigot" 32 which fits inside the bore of the tubular leg or column. The 
head of the casting includes an outwardly projecting disc portion 34 
connected to the main body of the casting by one quadrant of the disc 36, 
so that a vertical plane through the pivot axis 38 of the disc falls 
outside the circumference of the main body as will be seen more clearly 
from the plan view of FIG. 5b. The other side of the head of the joint 
member carries and lug 24 for a carrying strap, which extends outwardly in 
a direction opposite to that of the pivot disc 34. 
As will be appreciated from a consideration of the plan view of FIG. 5b, 
and the other elevational view of FIG. 5c, the body of the disc 34 is also 
offset to one side of a vertical plane through the leg axis of the joint, 
and this enables two such identical joint members to be connected 
together, with one "inverted" on top of the other, by means of a suitable 
pivot pin through the pivot discs, so as to form a joint which can be 
folded through 180.degree.. 
In order to assist in enabling the two discs to be "locked" in a wide range 
of relative angular positions, their mating surfaces are each provided 
with 48 radially extending teeth 40, which lock together when the pivot is 
screwed up tightly. 
It will also be noted from FIG. 5a and 5c that the "spigot" 32 of the joint 
member is bifurcated one half being provided with a threaded hole 42 for a 
grub screw which is accessible through a corresponding hole in the tube 
which fits over the spigot. The grub screw extends through the hole 42 to 
abut against the other leg of the spigot, and thus when it is tightened 
the two legs are forced apart so that they are then locked against the 
inside surfaces of the leg tube. 
An alternative method of providing a "right angle" mounting for the camera 
on the end of the centre column, which does not require a jointing member 
as illustrated in the previous embodiment, is shown in FIG. 6, in which 
the head 10 is provided with a first, conventional mounting screw 
arrangement 12 on its flat upper surface 44, as illustrated in FIG. 6a, 
and is also provided with a further, laterally projecting screw 46 on one 
side surface 48 which is specially extended to provide an additional 
mounting "platform". 
As illustrated in FIG. 7a, the "leg head" 50 of the tripod, by means of 
which the three legs are normally connected together, again includes a 
downwardly extending bifurcated spigot 52, which is also provided with a 
threaded hole 54 for a locking grub screw, to enable the leg to removed 
from the leg head, and to then be connected onto the jointing member 18, 
as described above to form the lower part of the monopod. 
In addition, in order to provide improved stability to the tripod, 
particularly when it is in its "low angle" configuration, the pivot disc 
56 of the leg head may also be provided with fine radial knurling or 
milling 58 on both sides, which abuts against corresponding milled 
surfaces on the intervening wedges or spaces of the tripod head, and thus 
provides a high level of frictional resistance against any tendency of the 
tripod to collapse or sag from its "wide-legged" position.