Automatic Ring Clutch for Extension Pedestals.
Year: 1893

page_text: Date of Application, 20th June, 1893
Complete Specification Left, 31st Mar., 1894-Accepted, 5th May, 1894
PROVISIONAL SPECIFICATION.
Automatic Ring Clutch for Extension Pedestals.
EDMUND HART Bk. 63 Crompton Road Nechells Birmingham Art Metal Smith
do hereby declare the nature of this invention to be as follows:-
A metal ring fitted in a cap.at top of outside tube the inner tube or rod to pass
through ring the ring canting will hold the inner tube or rod from being lowered
till put out of gear or released by lever at side of cap.
Dated this 19th day of June 1893.
EDMUND HART.
COMPLETE SPECIFICATION.
Automatic Ring Clutch for Extension Pedestals.
I, EDMUND HART, of back of 63 Crompton Road Nechells, Birmingham,
Blacksmith, 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 :-
This invention consists of the herein-described improvements in or connected with
the sliding gear and grip for telescopic stands for electric, oil, gas or other lamps,
reading & music stands, lecterns, music stools, chandeliers & the like, and for
lifts, winches & other purposes where an automatic and secure grip or brake is
desirable.
In some of the lamp & other stands now made the sliding gear is so arranged that
an inner tube or rod is gripped by a pair of jaws or wedges or other parts actuated
by a spring or springs, or by the weight of the lamp or article which is to be raised
or lowered. These methods are mostly dependent upon the action of the said spring
or springs which may at any moment fail, and moreover have the disadvantage of
being expensive to manufacture and complicated in action. These defects it is the
object of my invention to overcome, & this I accomplish as follows:-
According to this invention I provide an outer tube or shaft of metal or wood or
other material and an inner tube or rod which supports the lamp or desk or other
article which is to be raised or lowered. At the upper end of the outer tube or shaft
or elsewhere as may be convenient is placed a box or chamber in which is placed a
ring or washer whose.internal diameter is slightly larger than the external diameter
of the inner tube or rod. The box or chamber is so arranged that the ring or
washer may either lie in a slanting position or may be lifted or pushed into a
horizontal plane. The effect is that while the washer or ring lies in a horizontal
plane the inner tube or rod will readily pass through it in either direction, but when
the ring or washer is placed in a slanting position it grips the inner tube or rod and
prevents its movement.
The accompanying drawings to which I will now refer illustrate various applications
of the said invention.
The same letters of reference indicate the same or corresponding parts in all the
figures.
Figure 1 is a sectional elevation and Fig. 2 is a sectional plan of the invention as
applied to telescopic lamp stands and the like. A is an inner tube or rod bearing
the lamp or other article at its top end sliding through the box or receptacle F.
C is the ring or washer pivotted on one side so that it is always clear of the bottom

page_text: of the box F. E is a collar or cap with chain attached to the ring C opposite to
pivot D so that the ring C may be raised into a horizontal plane. B is the outer
tube or shaft.
Fig. 3 is a sectional elevation and Fig. 4 a sectional plan of another method of
attaining the same purpose as illustrated in Fig. 1. One side of the ring C rests
upon a shoulder or shelf D' in the box F and the other side of the ring C is raised
into its horizontal position by means of a lever or thumb-piece E' working on a
pivot fixed on the wall of the box F.
Fig. 5 is a sectional elevation and Fig. 6 a sectional plan of the invention
as applied to telescopic electroliers. The general arrangement is similar to
Figs. 3 & 4, the lever E being worked by a chain or cord. G is an insulating
collar or bush to protect the insulated electric supply wires H from getting chafed.
Fig. 7 is a sectional elevation and Fig. 8 a sectional plan of another form of the
invention as applied to telescopic electroliers. The general arrangement is similar
to Fig. 5 & Fig. 6 but the washer C is thicker on one side and has a slot cut in it
in which works a projecting rib A¹ on the inner rod A by means of which the
washer C may be worked up the inclined plane J fixed on the inner wall of box F
into a horizontal position.
My said invention is applied to sliding apparatus in any of the ways herein before
described and illustrated by the accompanying drawings as applied to lamps,
standards & pendants. The invention is equally applicable where the weight is
carried above or suspended beneath the gripping ring.
Having now particularly described & 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
1. The hereindescribed improvement in or connected with the sliding gear and
grip of standards, pedestals, pillars or pendants for electricity, gas, oil & other
illuminants, music desks, stands or stools, reading desks, lecterns, lifts, winches &
other purposes where a secure and automatic grip or brake is desirable, substantially
as herein before set forth.
2. In combination with an outer tube or shaft with an inner tube or rod the use
of a circular ring or washer either with or without a pivot attached & either lifted
from above or raised from beneath substantially as described and illustrated
by Figs. 1, 2, 3, 4, 5, 6 of the accompanying drawings.
3. In combination with an outer tube or shaft with an inner tube or rod the use
of a circular ring or washer moving on an inclined plane into a horizontal
position for any of the purposes mentioned in Claim 1 substantially as described and
illustrated by Figs. 7 & 8.
Dated this 20th day of March 1894.
EDMUND ᎻᎪᎡᎢ,