pneumatic hammer
				   		Percussive tool that is powered by compressed air; with the help of a piston, it activates a tool, which breaks through very hard matter such as rock and concrete.
				
 
					
					
					
					
						retainer 
						Device that holds the tool in place in the chuck.
				  	
 
					
						chuck 
						Part of the hammer to which the tool is fastened.
				  	
 
					
						flexible hose 
						Flexible hose through which compressed air from the compressor it is attached to enters the hammer.
				  	
 
					
						flexible hose connection 
						Fastening device with a metal part that accepts the flexible hose so that compressed air can enter the hammer.
				  	
 
					
						throttle valve 
						Movable part that is opened by the control lever to let compressed air into the hammer.
				  	
 
					
						exhaust port 
						Opening through which compressed air is expelled from the pneumatic hammer.
				  	
 
					
						silencer 
						Device that lessens the noise caused when air exits the hammer.
				  	
 
					
						lubricator 
						Device that automatically oils the various parts of the hammer to prevent wear.
				  	
 
					
						handle 
						The two elements that allow a worker to manipulate the hammer.
				  	
 
					
						control lever 
						Grip used to operate the hammer; the lever opens the throttle valve so that air can enter the hammer.