An Automatic Arresting Device for Telescopical Slides.
Year: 1891

page_text: Date of Application, 10th June, 1891-Accepted, 11th July, 1891
COMPLETE SPECIFICATION.
An Automatic Arresting Device for Telescopical Slides.
I, LUDWIG KEYLING, of 47, Garten Strasse, Berlin, N., Kingdom of Prussia,
Germany, Works-manager, do hereby declare the nature of my invention, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
Telescopical slides, such as may be used for adjustable stays, posts or stands are
heretofore provided with automatical arresting devices, however, they could not
properly answer their purpose for two reasons:
Firstly the locking mechanism, which had to be released, when it was required
to lengthen or shorten the post, is perfectly movable in the same direction as the
weight of the supported body will come into action. The supporting tube or bar
therefore may easily slip down, when releasing the lock, and a jerking downward
of the supported body could never be perfectly avoided. Even when lifting the
body a bit up, the coupling mechanism would drop down, and it was necessary to
hold both separately, or a very skillful manipulation was required to set the stay
at the exact desirable length.
Secondly the locking mechanism could by no means be relied on, since by shakes
or jerks it would give way to the weight resting thereon and alter its position
unintentionally. The reason of this defect can only be found in the way the balls
or roller, forming the main part of the pinching mechanism, come to act. They
roll in between the surfaces of the telescopical tubes at equal distances of the
same, that is to say, the centre of the roller being equally apart from the two
surfaces, where the same is rolling upon, thus the liability to roll downward is rather
increased than prevented.
The device hereinafter described and forming the object of my invention happily
overcomes the above mentioned defects. The releasing of the locking device is
arrived at by merely pulling the same up a bit with two fingers, and by the same
hand the bar or tube supporting the body may be lifted up at the same time and
thus held until brought into the required position. Also the locking device is con-
structed by aid of rollers and a conical bar interposing between said rollers, which
are adapted to roll against the inside surface of the outer tube by a smaller radius,
than by which they would roll against the said bar forcing the same asunder. This
latter bar is a main-feature in my present invention, the same is not weighted by
the supported body, but may be handled independently of the same, it has a conically
shaped point, which by aid of a spiral spring is jammed in between the rollers,
which, thus being unable to revolve, holds the mechanism by friction. By lifting
the bar upward the rollers are set at liberty, and the locking device is released.
In order to make my invention more clear, I refer to the accompanying
drawing, in which similar letters denote similar parts throughout the several views
and in which :-
Fig. 1 is a longitudinal section of a complete stand when at rest.
Fig. 2 is the same, the arresting device being released for sake of altering the
length of the post.
Fig. 3 is a section of arresting device to an enlarged scale, and
Fig. 4 is a cross-section of the last.
a is the outer tube forming the main-part of the post, which may be firmly
attached to any flooring or wall or may be portable and therefore be provided
with a base or foot. A second tube t of less diameter is adapted to slide tele-
scopically inside of the first up or down and to carry the body l, which is to be
supported. Inside of the tube t there is a central bar d, having a long point of
somewhat conical shape. Near to the lower end the tube t is provided with two
Price tidl

page_text: circular notches e. A small roller is placed in each of these notches, the middle-
part of the same is cylindrical and the ends thereof conical. The conical parts
bear against the inner cylindrical surface of the outer tub: a, while the cylindrical
part of the roller bears and rolls against the central bar d. The upper part of this
bar dis encompassed by a spiral-spring, resting with its lower end against a
collar or pins, attached to the bar d and with its upper end against a nipple m
secured to the tube t. Thus the spring tends to hold the bar d downward and
force the conical point in between the two rollers, which separate and press against
the outer tube a. In this manner the arresting of the tube t is accomplished. The
radius, by which the rollers k would roll on the inner cylindrical surface of a by
way of the conical parts of k, is much smaller than that, by
would roll against the central rod or bar d, being half th.
drical part thereof. Therefore a jamming will take place
an unintentional dropping of the tube t and the body suppor
In adjusting the length of the stay, the bar d need onl drawn up by the
knob n, this releases the rollers or friction-members k. The tube t and with it
the supported body is carried by the knob n, the bar d and spiral-spring f. The
body now may be shifted into the required position, and by merely letting the
knob n go, the same will be firmly held in such a position.
E
the same roller
of the cylin-
letely prevent
Teby.
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 :-
An arresting device for telescopically arranged slides consisting of a firm and a
loose tube, one sliding in the other, of which the inner one is provided with two
circular notches (e) adapted to carry rollers (k), which are cylindrical in their
central part and conically rounded off at their ends, in combination with a central
bar (d), being adapted to jam in between the rollers (k) by aid of its conical point
and the spiral spring (f), for the purpose as described.
Dated this 30th day of May 1001
LUDWIG KEYLING.
By Frederick Walker,
11, Furnival Street, Holborn, London, E.C., Agent for the Applicant.