EP0121020A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A mineral mining pick and holder assembly
Assignee: G-D M & C Ltd
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Filing: 1983-11-02
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Granted: —
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Expires: 2003-11-02
Abstract
Abstract The combination of a mineral mining pick and a pick holder. The pick (1) has a shank (4) by which it is received in a socket (6) of a pick holder (2). Extending within the socket (6) is a spigot (13) which mates with a coupling socket (14) in the shank (4) automatically as the shank is inserted into the pick holder. During insertion of the spigot (13) into the socket (14), a frusto conical head (26) on the spigot passes through a resilient ring (25) mounted in an annular recess (24) of the coupling socket so that abutment of a shoulder (27) on the head (26) against the ring (25) retains the pick in the holder.The spigot (13) may be tubular to provide a watercoupl- ing from chamber (23) in the holder to passage (11) and ports (12) in the pick forflushing, cooling or dust suppression water supply. The resilient retaining ring (25) may provide a water seal between the spigot (13) and the socket (14).In an alternative arrangementthe spigot can be carried by the shank (4) to engage in a coupling socket in the holder (2).
Inventors
- 👤 John Douglas Thorpe
- 👤 George Joel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/187
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
151 words
The combination of a mineral mining pick and a pick holder; said pick comprising a body having a head with a cutting part and a shank which extends longitudinally from the head; said holder comprising a shank socket within which the shank is longitudinally received; and retaining means for releasably retaining the shank in the socket, said retaining means comprising a spigot carried by * one of said pick and pick holder members and extending longitudinally of the shank or socket and a coupling socket carried by the other of said pick and pick holder members, said coupling socket longitudinally receiving the spigot during insertion of the shank into the shank socket, and wherein the spigot has a shoulder and the coupling socket carries a resilient retainer which engages over said shoulder of the spigot during insertion of the shank into the shank socket to retain the shank in its socket.
Claim 2
Dependent Claim
151 words
The combination of a mineral mining pick and a pick holder; said pick comprising a body having a head with a cutting part and a shank which extends longitudinally from the head; said holder comprising a shank socket within which the shank is longitudinally received; and retaining means for releasably retaining the shank in the socket, said retaining means comprising a spigot carried by * one of said pick and pick holder members and extending longitudinally of the shank or socket and a coupling socket carried by the other of said pick and pick holder members, said coupling socket longitudinally receiving the spigot during insertion of the shank into the shank socket, and wherein the spigot has a shoulder and the coupling socket carries a resilient retainer which engages over said shoulder of the spigot during insertion of the shank into the shank socket to retain the shank in its socket.
Claim 3
Dependent Claim
38 words
The combination as claimed in claim 1 in which the shoulder is formed by a head part of the spigot, said head part being tapered to provide a lead-in surface for mating the spigot with the coupling socket.
Claim 4
Dependent Claim
30 words
The combination as claimed in claim 2 in which the head part is frusto conical and carries an annular shoulder against which the resilient retainer is to engage in abutment.
Claim 5
Dependent Claim
29 words
The combination as claimed in any one of the preceding claims in which the resilient retainer comprises a ring member seated in an annular recess within the coupling socket.
Claim 6
Dependent Claim
81 words
The combination as claimed in any one of the preceding claims in which the spigot is tubular, the bore of which communicates with a fluid passage in the member which carries the spigot and the fluid coupling socket is in communication with a fluid passage of.its member so that fluid flow communication can be effected from a fluid supply to the holder to passage means in the body of the pick for supplying fluid to an outlet port in the pick.
Claim 7
Dependent Claim
23 words
The combination as claimed in claim 5 in which the resilient retainer comprises a fluid seal between the spigot and its coupling socket.
Claim 8
Dependent Claim
45 words
The combination as claimed in either claim 5 or claim 6 and comprising valve means for controlling fluid supply to the pick, said valve means being arranged so that said fluid supply is effected substantially only during the period for which the pick is cutting.
Claim 9
Dependent Claim
84 words
The combination as claimed in claim 7 in which said valve means is responsive to longitudinal displacement of the pick relative to its holder during use, said displacement controlling a valve member which allows fluid to flow to the pick when the pick is displaced longitudinally in response to the pressure to which it is subjected during cutting engagement and which cuts off_said fluid flow when the pick moves out of said cutting engagement and is longitudinally displaced by fluid pressure within the combination.
Claim 10
Dependent Claim
31 words
The combination as claimed in any one of the preceding claims in which the spigot is carried by the pick holder to be received by the coupling socket in the shank.
Claim 11
Dependent Claim
30 words
The combination as claimed in claim 9 in which the spigot is screw threadedly mounted in the . holder to be removable therefrom through the mouth of the shank socket.
Claim 12
Dependent Claim
92 words
The combination as claimed in any one of the preceding claims in which the pick is capable of restricted longitudinal displacement relative to the pick holder when retained by said retaining means; a shoulder is formed between the pick head and the shank, and wherein a seal is provided between the pick holder and the pick head, said seal bridging a clearance which opens and closes between said shoulder and the pick holder during longitudinal displacement of the pick relative to its holder to alleviate the entry of detritus into said clearance.
References Cited (Backward Citations)
GB2104945A
Cited
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