Adjustable Head for Tripod Stands.
Year: 1891

page_text: Date of Application, 2nd July, 1891
Complete Specification Left, 30th Mar., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
Adjustable Head for Tripod Stands.
JOSEPH JOHN ELMER, Engineer, 9, Hornsey Rise Gardens, London, N. do
hereby declare the nature of this invention to be as follows:-
The part of the tripod head to which the legs are attached in the usual way I
make in the form of a ring cut from a hollow sphere and into this is fitted a plano-
convex section of a sphere of the same diameter. In the centre of the plano-convex
section a hollow screw is fixed & by means of a nut and spherical washer on this
screw, the plano convex section can be clamped to the ring supporting it, in any
position within the limits of its motion.
Through the hollow screw is passed the clamping screw for fixing the required
instrument, such as a camera for instance, to the stand.
It is obvious that the form of construction could be reversed, that is, the ring
part could be inverted and upon it a plano concave moving part fitted.
Dated this 30th day of June 1891.
J. J. ELMER.
COMPLETE SPECIFICATION.
Adjustable Head for Tripod Stands.
1 JOSEPH JOHN ELMER of 9 Hornsey Rise Gardens London N. Engineer do
hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement:-
The part of the tripod stand head to which the legs are attached in the usual
way is made in the form of a ring cut from a hollow sphere and into this is fitted a
plano-convex section of a sphere. In the centre of the plano-convex section a
hollow screw is tightly fixed and by means of a nut and spherical washer on this
screw the plano-convex section can be clamped to the ring supporting it in any
position within the limit of its motion. Through the hollow screw is passed the
clamping screw for fixing the required instrument-such as a camera for instance-
to the stand.
The above description will be more clearly understood by reference to the
drawings herewith,
Fig. 1 being a section and Fig. 2 a plan of the tripod stand head.
A is the ring having lugs B for the attachment of legs. C is the plano-convex
section of a sphere. D is the hollow screw, E its nut and F the spherical washer.
G is the clamping screw which for convenience is kept from falling out by means
of the small groove and pin at H.
The stand being set up, it will be seen, that, by unscrewing the nut E the plano-
convex section of a sphere C will be free to move in the ring A and that its flat
surface can be set level or inclined in any direction without altering the position of
the ring A with its attached legs.
When the desired position of C is found the nut E is screwed up thus clamping C
to A by means of the washer F.
The form of construction could obviously be reversed if desired as shown by
Fig. 3. It is also obvious that the part A could form part of stands other than
trined stande

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
The method, substantially as set forth, by which the plane of a plano-convex
section of a sphere can be inclined in any direction and secured in the same without
altering the position of the part or parts supporting it and that an instrument resting
upon this plane can be pointed in any direction parallel with the plane without
altering the angle of inclination.