SOCKETED BOSS HAVING MEANS FOR RETAINING A TOOL SHANK

TRADUCTION NON-DISPONIBLE

English Abstract

ABSTRACT OF THE DISCLOSURE
A mineral mining pick boss having a socket
therein for the reception of a shank of a mineral mining
pick and a locking arrangement for retaining the shank,
the locking arrangement comprising a plug received in a
bore extending through the boss transversely of the
socket the arrangement being such that the bore intersects
the socket, the plug comprising a body of a resilient
material (e.g. neoprene) having bonded into the periphery
thereof at spaced locations a plurality of metallic
members one of which protrudes from the bore into the
socket for frictional engagement with the shank of the tool
so as to retain the tool in position, the other(s) of the
metallic members being disposed within the bore, and the
arrangement of the metallic members being such that the
plug may be removed from the bore, rotated and re-inserted
to change the metallic member which protrudes into the
socket.
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Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A boss having a socket therein for the reception
of a shank of a tool and a locking arrangement for
retaining the shank, the locking arrangement comprising a
plug received in a bore extending through the boss
transversely of the socket the arrangement being such that the
bore intersects the socket, the plug comprising a body of a
resilient material having bonded into the periphery thereof
at spaced locations a plurality of metallic members which
form semi-cylindrical protrusions from the surface of the
resilient body one of said metallic members protruding
from the bore into the socket for frictional engagement with
the shank of the tool so as to retain the tool in position, the
other(s) of the metallic members being disposed within the
bore, and the arrangement of the metallic members being such
that the plug may be removed from the bore, rotated and
re-inserted to change the metallic member which protrudes into
the socket.
2. A boss according to claim 1, in which the metallic
members are equispaced around the periphery of the resilient
body.
3. A boss according to claim 2, in which there are two
metallic members.
4. A boss according to claim 3, in which the resilient
body is of generally cylindrical form.
5. A boss according to claim 2, wherein there are three
metallic members.
6. A boss according to claim 5, in which the resilient
body is of generally triangular transverse section, the metallic
members being bonded into the apices thereof.

7. A boss according to claim 2, wherein there are four
metallic members.
8. A boss according to claim 7, in which the resilient
body is of generally square transverse section, the metallic
members being bonded into the corners thereof.
9. A boss according to claim 8, in which the metallic
members have a length less than that of the resilient body,
which body extends across the ends of the metallic members
to provide sealing at the ends of the bore.
10. A boss according to claim 9, in which the metallic
members are cylindrical rods.

Description

~98137
This invention relates to means for holding a
shank of a tool in a socket, and is particularly but
not exclusively ~or use in retaining a mineral cutter
pick in a socket in mining machinery.
It is known to retain a mineral cutter pick
in a socket by means of a resilient plug which ~orces
a metal pin against the shank of the pick, the shank
being formed with a surface such that the pin exerts a
frictional force which tends to keep the cutter pick
pulled down on its seating. An arrangement of this
type 1~ shown for example in the complete speci~ication
of U.K. Patent No. 895,764.
Prior constructions o~ this type require a
rather large diameter o~ resilient plug which limits
the applications of such locks. They also require
relatively Prequent replacement o~ the plugs, since the
pins tend to wear fairly rapidly.
It is an object o~ the present invention to
provide an improved lock ~or retaining a shank in a
socket.
The present invention accordingly provides a
boss having a socket therein ior the reception of a shank
oi' a tool and a locking arrangement for retaining the
shank, the locking arrangement comprising a plug received
in a bore extending through the boss transversely oi' the
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~98137
socket the arrangement'being such that the bore
intersects the socket, the plug comprising a body o~
a resilient material having bonded into the periphery
thereo$ at spaced locations a plurality o~ metallic
members one of which protrudes from the bore into the
socket for ~rictional engagement with the shank of
the tool so as to retain the tool in position, the
other(s) of the metallic members being disposed within
the bore, and the arrangement o~ the metallic members
being such that the plug may be removed ~rom the bore,
rotated and re-inserted to change the metallic member
which protrudes into the socket.
The invention also encompasses a mineral mining
machine provided with one or more bosses as de~ined
,above.
Embodiments oi the present invention will now
be described, by way of example, with reference to the
accompanying drawings, in which:-
Figure 1 is a side elevation of a mineral cutterpick received in a pick boss, the boss being sectioned
through its central plane, and incorporating one
embodiment of the invention;
Figure 2 is a perspective view o~ a locking means
o~ Figure l;
Figure 3 is an exploded perspective view o~ the
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i~9~137
parts of Figure 2;
Figure 4 is a view similar to that o~ Figure 1
but showing another embodiment;
Figure 5 similarly shows a third embodiment;
Figure 6 is an exploded perspective view o$ the
locking means of Figure 5; and
Figure 7 is a part-sectional side elevation oi
a ~inal embodiment.
Reierring to Figure 1, a mineral cutter pick
o~ known type has a shank 10 in which is iormed a groove
having a sloping shoulder 12 transverse to the direction
oi motion, in use, o~ the cutter pick. The shank 10 o~
the cutter pick is received in a metal boss 14 which in
use is secured as by welding to a cutter drum or chain
o~ a mining machine. The boss 14 has a socket 16 passing
therethrough and dimensioned to receive the shank 10 o~
the pick.
A bore 18 is ~ormed through the boss 14 in a
direction at right angles to the socket 16. The bore 18
has the ~orm o~ three superimposed cylinder~.
The bore 18 receives a locking plug comprising
metal rods 22 and 20 bonded into a body o~ neoprene 24,
as seen in greater detail in Figures 2 and 3. The rods
20 and 22 are shorter in length than the neoprene body 24,
the latter being extended at its ends as indicated at 24a
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~98~37
to cover the ends of the rods 20, 22.
In use, the shank 10 of the cutter pick may be
inserted downwardly into the socket 16. During such
insertion the rod 20 which projects into the socket is
forced back against the neoprene body 24 and is then
sprung against the shoulder 12. Because of the
inclination of the shoulder 12, the neoprene body 24
exerts a resilient force causing the rod 20 to
~rictionally engage the shoulder and force the pick
downwardly to bring a shoulder 26 on the pick into
abutment with the top o~ the boss 14.
When the rod 20 becomes worn to an unacceptable
extent, the entlre plug 20, 22, 24 may be withdrawn and
replaced turned through 180 to bring the other rod 22
into use. The provision of a second rod such as 22
received in a part-cylindrical surface o~ the bore 18
also resists any tendency of the plug to rotate under
load. Also, the resilient portions 24a act to seal the
ends of the bore 18 to prevent the ingress of dirt and
so assist in reducing wear.
The embodiment of Figure 4 is similar, except
that the neoprene body 24 has bonded therein four metal
rods 20, 20', 22 and 22' set 90 apart.
Figures 5 and 6 illustrate an embodiment in which
the bore 18 is of substantially triangular section, and
receives a neoprene body 50 which is also substantially
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~9 !3137
triangular and has three metal rods 52, 54, 56 bondedinto its apices. As seen in Figure 6, here again the
neoprene body extends over the ends of the rods to seal
the bore.
Finally, Figure 7 shows a neoprene body 70 o~
generally square section seated in a corresponding
bore and having metal rods bonded in its corners.
It will be appreciated that metallic bodies
in forms other than rods may be used, for example bodies
with part-cylindrical surfaces extending ~rom the
resilient body but having ~lattened portions extending
into the resilient body to assist in bonding.
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