Adjustable Friction-Grab for Fishing-Tools. Page: 2 of 3
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UNITED STATES PATENT OFFICE.
LAWRENCE E. DICKSON. OF STRAWN, TEXAS.
ADJUSTABLE FRICTION-GRAB FOR FISHING-TOOLS.Specification of Letters Patent.
Pateltel May 24, 1921.
Application filed July 1Q, 1920. Serial No. 395,307.
Toa / homn it ily Iiconcern:
Be it known that I. LAWRENCE. DICK-
SON, a citizen of the Inited States of Amer-
ica, residing at Strawn. in the county of
5 Palo Pinto and State of Texas, have in-.
vented certain new and useful Improvements
in Adlljustable Friction-Grabs for Fishing-
Tools, of which the following is a specifica-
tion.
10 Mv invention relates to grabs for fishing
tools in well drilling operations and more
particularly to adjustable friction grabs;
and the object is to provide grabs which can
be easily adjusted for different sized holes
15 or wells and which will be automatically ad-
justed and the grabs automatically closed
on the object to be removed. Other objects
and advantages will be fully explained in
the following description and the invention
20 will be more particularly pointed out in the
cla ims.
Reference is had to the accompanying
drawings which form a part of this applica-
tion.
25 Figure 1 is a side elevation of the grabs
and the means for operating the same. Fig.
2 is a broken sectional view, illustrating the
connection of the grabs with the operating
drive and with the spreading and closing
30 block. Fig. 3 is ,a horizontal section, taken
just below the base 7, showing the connec-
tion of the spreading and closing block with
the grabs. Fig. 4 is a detail view of one of
the grabs.
35 Similar characters of reference are used
to indicate the same parts throughout the
several views.
The tool is provided with the usual jars 2
and 3 and a connection 1 on the jar 2 for
40 attaching to a stem or sinker. The jar 2
has a head 11 for striking a rod or pin 6.
The arms of jar 3 slide or move freely on
the head 11. The arms of jar 3 may be
formed or cast integral with a base 7 which
45 is perforated for the free passage of the rod
or driving pin 6. The base 7 has a trans-
verse slot in the lower part to receive the
upper ends of the grabs 4. The grabs 4 are
thus pivotally connected to the base 7 by
50 pivot bolts 5 so that the upper ends of the
grabs 4 will swing in the slot 13. The driv-
ing pin 6 is rigid with the spreading and
closing block 8. The block 8 is operatively
connected with the grabs 4 by means of lat-
55 eral flanges or ribs 10 which are received in
T-slots or grooves 9 in the block 8. Thegrabs 4 are set at different angles by placing
the pins 14 in different holes 12 in the grabs
so that the pins will project under the edges
of the block and support the block S at dif- 60
ferent adjustments to spread the grabs more
or less according to the size of the hole or
well. The pins 14 are frangible and when
the head 11 drives the pin 6 down, the pins
14 will be broken so that the block 8 can go 65
down and close the grabs on the object to be
removed. The grabs may have teeth 15 at
their lower ends to aid taking hold f the
object to be removed. - When the tool is
reacy to be raised. a pull on the stem will 70
cause the head 11 to rise and engage the
head 16 for pulling on the grabs 4.
What I claim is.-
1. In a fishing tool provided with adjust-
able jars, the lower jar having a base pro- 75
videdl with a transverse slot therein, friction
grabs pivotally connected to said base in said
slot and provided with lateral flanges, a
driving and spreading plate having vertical
slots to receive said flanges, and a pin rigid 80
with said plate and projecting through said
base to be actuated by said upper jar.
2. In a fishing tool provided with tele-
scopiI upper and lower jars, the lower jar
having a base provided with a transverse 85
slot therein, friction grabs pivotally con-
nected to said base in said slot, each grab
having an inwardly projecting web and
lateral flanges on said web. a closing and
spreading plate having vertical T-slots for 90
said web and said flanges. and a pin rigid
with said )late and projecting freely
through said: base to be actuated by said
upper jar.
3. In a fishing tool provided with upper 95
and lower jars telescopically connected to-
gether, the lower jar having a base provided
with a transverse slot therein and the upper
jar having a driving head at the lower end
thereof, a pair of friction grabs pi totally 100
connected to said base in said slot and each
grab having an inwardly projecting web and
lateral flanges on said web for controlling
the directions of said grabs, a plate having
vertical T-shaped slots to receive said webs 105
for opening and closing said grabs. and
frangible pins for supporting said plate
temporarily, and means for moving said
plate vertically for opening and closing said
grabs. 110
4. In a fishing tool provided with upper
and lower jars telescopically connected to-1,378,841.
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Dickson, Lawrence E. Adjustable Friction-Grab for Fishing-Tools., patent, May 24, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257155/m1/2/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.