Improvements in Fastenings for Telescopic Ladders.
Year: 1899

page_text: Improvements in Fastenings for Telescopic Ladders.
JAMES HENRY HEATHMAN, of 2, Endell Street, London, W.C., Ladder Maker,
do hereby declare the nature of this invention to be as follows:
:-
For telescopic or sliding ladders the ladder fastening or lock is so shaped
that it projects both above and below a rung of the ladder as well as behind
the rung so that to a great extent it does not for its security rely upon the
pivot upon which the lock works.
The lock may be operated by the hand of a person or fitted with levers so
that it can work automatically by the movement of the ladder.
A spring may be applied to render the working of the lock more reliable.
The fastening which I call a lock is made of metal or other material, with an
inclined face so that it is easily rocked out of position when the ladder rungs
traverse such inclined face, the inclined face is extended down so that it hooks
over the ladder rung on which it is intended to rest. The back part of the
lock is continued down to below the rung of the sliding ladder and there is a
lug formed on the lower part of the lock, which projects under the rung, with
the object that if the pivot upon which the lock works, should break the lug
under the rung will sustain the weight of the ladder section.
The lock may be rocked to & fro with one's hand but when it is desired to
render the movement of the lock automatic through the medium of the rungs,
I provide a cranked rod having a long slot in which travels a stud which is
fixed upon the end of the lock, while the cranked rod carries at its lower end
a lever which is attached to the ladder in such a way that it is pivoted upon
this attachment, so that when the lever rocks up or down it carries with it the
cranked rod in such a way as to cause the stud to travel up & down in the
groove of the cranked rod and thereby the lock is moved backward & forward.
Dated this 12th day of June 1899.
J. H. HEATHMAN,
Applicant for Patent No. 1922 of 27th January 1899.
Improvements in Fastenings for
sa
JAMES HENRY HEATHMAN, of 2, Endell Street, London, W.C., Ladder Maker,
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:-
"
For the purpose of supporting one section of a telescopic or sliding ladder

page_text: upon another section I provide a lock shewn in Figures 1 and 2, 3 & 4, upon
the accompanying-drawings and described as follows:-
A is the lock having an inclined face C so designed that when the lock is
attached at E to the ladder section G, the lock is moved out of the path of
the rungs on the ladder section F by the rung marked H on ladder F striking
the face C and so rocking the lock out of its path. Upon the lock A is formed
a lug B which projects under the rung J on ladder section G, so that should
the attachment bolt E be insecure, the lug B will support the sliding section
by its engagement under rung J.
I connect 2 locks by means of a cross rod D which offers itself to be gripped
by the hand of a person for the purpose of moving the locks to and fro, as well
as to raise and lower the sliding ladder section.
To enable the lock to work automatically at the rising and lowering of the
sliding ladder section I shew on Figures 3 & 4 a cranked rod "K" having a
long slot "L" in which travels a stud "M" which is fixed upon the end of
the lock.
[!
To the cranked end of the rod at "N" I rivet a lever "O," which is
áttached to the ladder at "P," by a bolt or screw which has a projecting head
or stud, in such a position that the rising of the sliding ladder brings the
lever "O" in contact with the rungs of the lower ladder with the result that
the rungs move the lever "0," causing it to turn downward and allow the
rung to pass; and after passing the rung, the weight of the slotted cranked
rod "K"balances the lever "O" upward again.
When the sliding ladder is being lowered, the rungs in the lower section
cause the lever "0" to rise, with the result that the stud "P" presses against
the slotted cranked rod "K" and causes it to actuate the lock by means of the
stud "M" which travels in the slot "L."
By means of the spring "S" which is fixed at "T" to the sliding section
ladder the lock is pressed forward and the slotted cranked rod has to resume
its vertical position through the medium of the stud "M" traversing in the
slotted groove "L."
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:
1. In fastenings for telescopic ladders the combination of the lug "B" which
projects under the rung on ladder so that should the attachment bolt be insecure
the lug "B" will support the sliding section by its engagement under the
rung J."
2. In fastenings for telescopic ladders the combination of the cranked slotted
rod "K" with lever "O" for the purpose herein before described.
Dated this 14th day of Anonst 1900
:
J. H. HEATHMAN.