An Improved Gripping Clamp.
Year: 1890

page_text: Date of Application, 1st Nov., 1890
Complete Specification Loft, 20th July, 1891-Accepted, 31st Oct., 1891
PROVISIONAL SPECIFICATION.
An Improved Gripping Clamp.
SAMUEL DUNSEITH MCKELLEN 3 Chapman Street Hulme Photographic
Engineer do hereby declare the nature of this invention to be as follows:-
The invention relates to tripods for cameras, surveying instruments & all other
forms of portable tripods, music & other stands fishing rods, gaslighters, wands,
whip handles and all kinds of instruments which are formed by an inner part
sliding inside an outer part and is intended to enable such instruments to be
lengthened and the sliding parts firmly and instantly gripped together. It may be
described as a band encompassing the outer part in which the inner part slides.
Between the band and the outer part in a convenient position a wedge is inserted.
This wedge carries a suitable nib which, pressed by a spring, bears on the inner
slide.
The inner slide has notches or indentations or projections placed along its side
in such a way that the wedge nib falls into or over them. When the slide is being
drawn out the wedge follows it a little until its thinner end is under the band."
This allows the nib to pass over the notches or projections when the instrument is
being lengthened and also allows it to be lifted out of contact with the inner.slide
when it requires to be closed up.
When the slide is drawn out to any required extent and is pressed in as though
to reclose it the nib falls into one of the notches or is caught by, a projection and
presses the wedge between the band and the outer part.
In the case of camera legs & other tripods & stands the effect is to clamp the
outer parts firmly on the inner part and the greater the pressure on the legs the
firmer will be the clamp. In the case of instruments formed of tubing it will be
necessary to have enough elasticity in the outer tube to allow of its yielding to
the pressure of the wedge or it may be slit in a proper place to allow of its closing
tight on the inner slide.
Dated this 31st day of October 1890
COMPLETE SPECIFICATION.
An Improved Gripping Clamp.
SAMUEL DUNSEITH MCKELLEN of 3 Chapman Street Hulme Manchester,
Photographic 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 invention relates to tripods, for cameras, surveying instruments and all other
forms of portable tripods. Also to music stands, fishing rods, gas lighters, wands,
whip handles and all kinds of instruments which are formed by an inner part
sliding inside an outer part and is intended to enable such articles to be lengthened
and the sliding parts instantly & firmly gripped together.
It may be described as a band made to encompas the outer part in which the
inner part slides. Between the band and the outer part in a convenient position a
wedge is inserted. This wedge carries a suitable nib or projection which bears on
the inner slide. The inner slide has notches or indentations or projections in
suitable positions on its surface so that the wedge nib falls into or over them.
When the slide is being drawn out the wedge follows it a little way until its
thinner end is under the band. This allows the nib to pass over the notches or

page_text: projections when the instrument is being lengthened and also allows it to be lifted
out of contact with the inner slide when it requires to be closed up. When the
slide is drawn out to the required extent and is pushed in as though to reclose it
the nib falls into the nearest, notch or is caught by a projection and presses the
wedge between the band and the outer part. In the case of camera legs or other
tripods and stands the effect is to clamp the outer parts firmly on the inner part
and the greater the pressure on the legs the firmer will be the clamp. In the case
of, instruments formed by tubing it will be necessary have enough elasticity in the
outer tube to allow of its yielding to the pressure of the wedge or it may be slit
in a way to allow the wedge to press on the slit part & so bind the inner part
firmly.
In the accompanying sheet of drawings
Fig. 1 represents side view of an extending bar such as may be used for the
support of a camera or like object and as herein before described.
Fig. 2 is plan of the same.
Fig. 3 is an extending bar of a circular form such as may be used for supporting
legs, fishing rods and other uses where a prolongation of the bar or rod is required
and
Fig. 4 is plan of the same.
In these views a, a are the outer bars.or parts between or within which the inner
bar or rod b, slides: c is a strap or hoop encircling said bars and secured to the
outer bar a by a pin e².
e, el are studs placed either outside of or within a slot formed in the strap or
hoop c to keep said strap in position. d is a wedge secured to the outer bar a by
the pin d. d is the nib which bears on the inner bar or rod and rests in the
notches 6. is a projection for raising the wedge out of the notches ¹.
In Fig. 4 a is a slit near the end of the outer tube a.
. Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed I declare that what I
claim is
In all kinds of instruments or objects that are formed by an inner part sliding
inside an outer part so as to enable such instruments to be lengthened, and the
sliding parts to be firmly gripped in the position required, the use of a wedge
carrying a nib in combination with a band or hoop and notches indentations or
projections on the inner sliding bar or rod for the purpose and in the manner sub-
stantially as herein before described.
Dated 1 101
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