Improved Safety Appliance for Lifts.
Year: 1897

page_text: Improved Safety Appliance for Lifts.
ROBERT WRIGHT 33 Paddock Street Ardwick Manchester do hereby declare the
nature of this invention to be as follows:-
The Invention is a Pair of Grips Worked By Spring and Lever to Grip the Hand
Rope or Chain of the Hydraulic Hoist or Other Gear-The Said Invention is Fastened
and Works on the right Side of the Hoist Box, The hand Rope or Chain is Released
From Grip By the attendant in Charge of the Hoist When Required to Be in Motion
and Reapplied Automatically When the Hoist is Stopped-The advantages are 1st
To Prevent Hoist Accidents By the Hoist Being Removed From the Place By any
Other Person than the attendent-2nd To Prevent the Hoist Starting in Motion By
any imperfect Machinery 3rd Should By any Means the Person in attendance Leave
his Position or Fall Down on the Floor of the Hoist Box the Hoist Will Immediately
Stop.
2
L M
1005
Improved Safety Appliance for Lifts.
1, ROBERT WRIGHT, of 33 Paddock Street, Ardwick, Manchester, in the County of
Lancaster, 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 :-
This invention relates to an improvement that is applicable to lifts or hoists, such
as are employed in warehouses, public buildings and like places as a means of
conveyance from and between the upper or lower and intermediate floors.
The object of this invention is to prevent accident arising from the hoist
mechanism being tampered with, or the hoist improperly starting in consequence of
imperfect machinery, or the hoist mechanism, becoming displaced. I attain this
object by the means hereinafter described reference being made to the accompanying
sheet of drawings in which Fig. 1 is a front view of my invention and Fig. 2 the
interior view of the same both representing the appliance in action. Fig. 3 is an
interior view representing the appliance placed out of action and Fig. 4 is an edge
view of the same: In these views similar letters refer to similar parts.
In this invention I affix near the front on the inner side of the hoist box an
automatic grip for gripping the hand rope or chain c by which the lift is worked,
and in such a position that the rope or chain will pass through said grip: The
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page_text: As
part 6 forms a portion of or is fitted to the plate d and the grip b is formed with
a tail piece 62 to slide therein; a stud or pin e which is fitted into and extends from
said tail piece is connected to the bell crank lever g that is pivotted at f; an expansion
spring as j placed on the pin e, one end of said spring bearing against the end of
the fixed portion b¹ of the grip and the opposite end pressing on the shoulder j¹ of
said pin, which by these means automatically retains the jaw or grip b always in
action. In order to release the rope or chain c the end g² of the lever is pulled
down which thereby compresses the spring ; and opens the grip 6 as in Fig. 3.
soon as the hold on the chain connected to the end g2 of the lever g is withdrawn the
spring causes the jaw b to close, and the rope or chain is gripped. The hand rope
or chain c is always retained in the grip 6 by the action of the spring j until released
by pulling down the end g² of the lever g; immediately the hold on said lever is
withdrawn, the aforesaid spring causes the hand rope or chain to be again gripped
and by these means the lift or hoist is always secured from inadvertent or accidental
movement.
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 :-
1st In lifts or hoists such as are employed in warehouses, public buildings and
like places as a means of conveyance from and between the upper or lower and
intermediate floors the use of apparatus consisting of a grip for the hand rope or
chain in combination with a spring for automatically placing said grip in action, and
a lever for releasing said grip in the manner and for the purpose substantially as
herein before described.
2nd In lifts or hoists such as are employed in warehouses, public buildings and
like places as a means of conveyance from and between the upper or lower and
intermediate floors, the application thereto of mechanism substantially as and for the
purpose herein before described.
Dated this 12th day of November 1897
THOMAS PRESCOTT
53 Arcade Chambers, St Mary's Gate Manchester,
Agent for the Applicant.