(0)E21C:0/4:
IPC6
SECTION E - FIXED CONSTRUCTIONS
MINING OR QUARRYING
E21C
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E 21 C

 MINING OR QUARRYING
 

Notes

(1)

 This subclass covers methods or apparatus specific to mining or quarrying. [3]

(2)

 This subclass does not cover, even though they may be disclosed only for mining or quarrying, drill bits, bore reamers, core taking devices, drilling pipes or rods, handling, racking or connecting arrangements for drilling pipes or rods, counterboring or enlarging drilled holes, flame drilling, or other drilling apparatus, which are covered by subclass E 21 B. [3]

 

 

 

Drilling machines
 

 1
/ 00 Rotary-drilling machines (rotary-drilling machines in general B 23 B; rotary earth drilling E 21 B 3/00; driving of shafts, galleries or tunnels E 21 D)

1
/ 02 • with a continuous rotation of the tool, with or without variable speed gearing  

1
/ 04 • • with slipping or elastic transmission  

1
/ 06 • with a to-and-fro rotation of the tool  

1
/ 08 • with an intermittent unidirectional rotation of the tool  

1
/ 10 • with a built-in feeding device (feeding devices E 21 C 5/00)  

1
/ 12 • with percussive action superimposed on a continuously-rotating tool always in contact with the working face  
 

 3
/ 00 Drilling machines with reciprocating tool that is intermittently turned when out of contact with the working face (portable percussion tools in general B 25 D)

3
/ 02 • Machines in which the tool is connected to an impulse member  

3
/ 04 • Hammer drilling machines in which the tool is hit by an impulse member  

3
/ 06 • Means for driving the impulse member  

3
/ 08 • • by a rotating mechanism  

3
/ 10 • • • formed as centrifugal hammers  

3
/ 12 • • • with spring-mounted reciprocating masses  

3
/ 14 • • • • with elastic joining of the drive to the push-rod by double buffer springs  

3
/ 16 • • by electromagnets  

3
/ 18 • • directly by a piston of an internal-combustion engine  

3
/ 20 • • directly by liquid pressure  

3
/ 22 • • • working with pulses  

3
/ 24 • • directly by air, steam, or gas pressure  

3
/ 26 • • • working with pulses  

3
/ 28 • Intermittent turning of tool obtained by rifled-bar or ratchet device  

3
/ 30 • • driven by separate motor  

3
/ 32 • with arrangements for automatic stopping when the tool is lifted from the working face or suffers excessive bore resistance (pick hammers E 21 C 37/24)  

3
/ 34 • Arrangements for locking the drill to the hammer or to the machine  

Details of drilling apparatus
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