Improvements in Automatic Grippers or Clip Forks Hauling Corves or Mine Wagons by means of Ropes or .Chains, or for analogous Purposes.
Year: 1885

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66
Improvements in Automatic Grippers or Clip Forks " for
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Hauling Corves or Mine Wagons by means of Ropes or
.Chains, or for analogous Purposes.
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We, WILLIAM RUTHERFORD of South Derwent Colliery Annfield Plain Lintz
Green in the County of Durhain Colliery Viewer and THOMAS THOMPSON of the
same place, Colliery Engineer do hereby declare the nature of our said Invention
for "IMPROVEMENTS IN AUTOMATIC GRIPPERS OR "CLIP FORKS" FOR HAULING
CORVES OR MINE WAGONS BY MEANS OF ROPES OR CHAINS OR FOR ANALOGOUS
PURPOSES." to be as follows:-
1214
'
"
L
Our Invention has reference to the class of device, described in the Specification
of our former Patent No 3060 of 11th February 1884 but according to our present
Invention we, with the object of providing a device cheaper in first cost, instead of
making both the clip pieces turn on centres make but one of the clip pieces to turn
upon a centre the other clip piece or pieces being fixed and constituting simply a
bearing surface or bearing surfaces so that as the rope is hauled it moves the
moveable clip piece relatively with the fixed clip piece or pieces or bearing surface
or surfaces and gives the necessary hauling grip on the rope. The device is
applicable generally as an automatic gripper for hauling by means of ropes 'or
chains.
"
173

page_text: improvements in Automatic Grippers or Cup Forks Ioг Hauшng
Corves or Mine Wagons by means of Ropes or Chains, or
for analogous Purposes.
We WILLIAM RUTHERFORD of South Derwent Colliery Annfield Plain Lintz
Green in the County of Durham Colliery Viewer and THOMAS THOMPSON of the
same place Colliery 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 :-
Our Invention has reference to the kind of device described and claimed in the
Specification of our former Patent No 3060 of 11th February 1884 but according to
our present Invention we, with the object of providing a device cheaper in first
cost, instead of making both the clip pieces turn on centres, make but one of the
clip pieces to turn upon a centre the other clip piece or pieces being fixed and
constituting simply a bearing surface or bearing surfaces so that as the rope is
bauled it moves the moveable clip piece relatively with the fixed clip piece or
pieces or bearing surface or surfaces and gives the necessary hauling grip on the
rope. The device is applicable generally as an automatic gripper for hauling by
means of ropes or chains.
The accompanying drawings illustrate constructions of grippers or clip forks
according to our Invention. Figures 1 and 2 shew in elevation and plan respec-
tively a gripper or clip wherein the fixed bearing piece is marked A and the
moveable piece is marked B. When the rope placed between the pieces A and B
is hauled in one direction, it pulls the piece B over on one side as shewn in dotted
lines (in Figures 24 and 6) turning upon one of the centre pins c on the plate C
which carries the piece Band when the said rope is hauled in the opposite direction
the said piece B is pulled over to the other side turning on the other of the pins c
and in both cases the movement lessens the space between the parts A and B and
the rope is consequently gripped. The holes bb through the base plate of the
piece B are curved to allow of this movement on the two centres.
Figures 3 and 4 are corresponding views of a modification wherein the piece B
moves on one centre c² to grip the rope between itself and one or other of the fixed
pieces A in accordance with the direction of haulage on the rope.
Figures 5 and 6 are corresponding views of a modification wherein the pieces
between which the rope is gripped are both upon the base plate d and form one
compound piece B turning upon one centre c³ in one or the other direction and grip"
the rope by being deflected out of the direct line of the travel of the rope. The
motion of the piece B is limited by stops which may be arranged as shewn at e.
The other parts of the device for attaching it to the wagon or the like are or may
be like the corresponding parts of the apparatus made according to our aforesaid
Patent.
To secure more gripping power when required and to avoid abrading the rope
or chain in any of the forms of our Inventions the faces of the clip piece or pieces,
forks or bearing surfaces may be lined or faced or covered with soft or elastic
material such a leather, India rubber, hempen cord, wood or the like.

page_text: In the several plans Figures 24 and 6 the full lines shew the positions when the
rope or chain is not gripped and the dotted lines shew the position when the rope
or chain is gripped.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
First. In automatic grippers or clip forks for hauling corves or wagons by
means of ropes or chaius or for analogous purposes the combination of a moveable
piece or pieces with a fixed piece or pieces or bearing surface or surfaces
substantially as herein before described.
Second. The several constructions of automatic grippers or clip forks herein-
before described and illustrated in Figures 1 and 2; 3 and 4, and 5 and 6 of the
accompanying Drawings.
Dated this 16th day of November 1885.
.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields, W.C.,
Agent for the said William Rutherford and
Thomas Thompson.