safety catches for cages or corves
Year: 1888

page_text: Date of Application, 7th June, 1888
Complete Specification Left, 7th Mar, 1889
Complete Specification Accepted, 13th Apr, 1889
I, PAUL VONHOF, of Sachsenburg, near Heldrungen, in the Empire of Germany
Engineer do hereby declare the nature of this invention to be as follows
-
This invention relates to improvements in safety catches for cages or corves and
18 illustrated in the annexed sheet of drawings The guiding bars a a of a cage or
The cage
corf slide with a certain play up & down along the guiding posts hh
or corf is suspended as shown in fig 1 on a spring f, so that the latter will be com-
pressed when a load is raised or lowered In this state the safety catch consisting
of the rollers rr the drawing rods z z and the lever-arm h which is provided with
the C springs & is rigidly connected with a moveable shaft, o, are mounted in
such a manner that neither the rollers nor the springs xx are in contact with the
To the lower side of the bottom
posts LL, but have a certain play between them
of the cage surfaces e e of angle iron are fixed in an inclined position with respect to
the guiding posts L L In the case of a rupture of the whim-rope the above described
mechanism will act in the following way
The spring fis relieved or released & pulls the bolt 6 downward, which movement
Is transmitted by the cross-bart rigidly connected with the said bolt 6 to the outer
arm of the lever h, which turns with the shaft o, the drawing rods are then raised
and the rollers run along the inclined planes e e until the friction between the
guiding bars a a of the cage and the posts L L has increased to such an extent, that
the falling cage will be stopped
PAUL VONHOF,
Per L W

page_text: Improvements in Safety Catches for Cages or Corves
I, PAUL VONHOF of Sachsenburg, near Heldrungen in the Empire of Germany,
Engineer, do hereby declare the nature of this invention and in what manner the
is to be performed, to be particularly described and ascertained in and by
the following statement
same
This invention relates to improvements in safety catches for cages or corves
Apparatus according thereto is illustrated in the annexed drawing
Fig 1 being a front view,
Fig 2 a side view and
Fig 3 a plan-The guide bars a a of the cage or corve run with a certain amount
of play, long guide rails L L which may be made of iron trough section as shewn or
of wood
The frame of the cage or corve, as will be seen from Fig 1, is suspended from or
hung on springs f,f, in such manner that the springs will be compressed to an extent
corresponding to the weight of the load
The safety apparatus or mechanism which
comprises rollers "", draw rods z, z, and
double lever arms h h (pivotted at o) is arranged in such a manner that between the
rollers and the guide rails L L there is left a certain amount of play
Surfaces e e of angle iron, and inclined towards the guide rails L L, are provided
at the bottom of the lift-cage
In the event of breakage of the rope, the following takes place
The carrying springs f,f, are freed from the load, and move the inner ends of the
levers in a downward direction
The outer ends of the levers h h, which are connected to the draw rods z z move
in an upwud direction, and consequently also move the draw-rods in the same
direction
The rollers e e mounted on the lower ends of the drawrods zz are thereby forced
between the guide-rails L and the inclined surfaces e, until the friction produced
between the guide bars a of the cage, and the guide-rails L L, becomes so great as
to arrest the falling cage
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1 Safety apparatus for lift cages or corves, comprising rollers or balls r, which
on the rope breaking, will be brought, by being lifted or raised by suitable means,
into contact with inclined an
TT
2

page_text: movement of the lift cage will cause the rollers to rotate and run up on the
inclines e e,
and thus produce a pressure between the guide bars a a and the guide
rails L L, so that the friction thus produced will prevent further descent of
the cage
2 The improved safety apparatus for lift cages or corves substantially as shown in
and described with reference to the annexed drawing
W LLOYD WISE,
Per FJ B,
46, Lancoln's Inn Fields, London, WC,
Agent for the Applicant