Hammering Apparatus

Abstract

Hammering apparatus functioning with a pressurized medium, such as a pressure fluid of a hydraulic system which hammering apparatus comprises an elongated body ( 19 ) to be attached to a power tool, a movable impact mass ( 10 ) adjusted to rest on the body ( 19 ) for which impact mass a linear control part is adjusted to the mentioned body ( 19 ) and an arrangement for lifting up the movable mass ( 10 ) for the impact comprising the first cylinder ( 20 ) and a piston ( 16 ) which can be moved in it with the help of pressure fluid and a piston rod ( 1 ) in which case in the arrangement the mentioned piston rod ( 1 ) is attached to the mentioned mass ( 10 ) and comprises a valve arrangement ( 15 ) with the help of which the pressure of the hydraulic fluid can be directed to the first cylinder ( 20 ) to the other side of the piston ( 16 ) for the uplifting of the mass ( 10 ) and the mentioned pressure can be suddenly reduced when the mass ( 10 ) is being directed to impact. During the impact of the mass ( 10 ) the hydraulic fluid or a part of it coming back from the cylinder space ( 6 ) of the first cylinder ( 20 ) can be directed to an expanding space ( 2 ) inside the piston rod ( 1 ) with the help of a valve arrangement ( 15 ) in which case a harmful back pressure caused by the hydraulic fluid being removed from the front of the piston ( 16 ) is essentially reduced.

1 . Hammering apparatus functioning with a pressurized medium, such as a pressure fluid of a hydraulic system which hammering apparatus comprises an elongated body ( 19 ) to be attached to a power tool, a movable impact mass ( 10 ) adjusted to rest on the body ( 19 ) for which impact mass a linear control part is adjusted to the mentioned body ( 19 ) and an arrangement for lifting up the movable mass ( 10 ) for the impact comprising the first cylinder ( 20 ) and a piston ( 16 ) which can be moved in it with the help of pressure fluid and a piston rod ( 1 ) in which case in the arrangement the mentioned piston rod ( 1 ) is attached to the mentioned mass ( 10 ) and comprises a valve arrangement ( 15 ) with the help of which the pressure of the hydraulic fluid can be directed to the first cylinder ( 20 ) to the other side of the piston ( 16 ) for the uplifting of the mass ( 10 ) and the mentioned pressure can be suddenly reduced when the mass ( 10 ) is being directed to impact, characterized in that during the impact of the mass ( 10 ) the hydraulic fluid or a part of it coming back from the cylinder space ( 6 ) of the first cylinder ( 20 ) can be directed to an expanding space ( 2 ) inside the piston rod ( 1 ) with the help of a valve arrangement ( 15 ) in which case a harmful back pressure caused by the hydraulic fluid being removed from the front of the piston ( 16 ) is essentially reduced. 
     
     
         2 . Hammering apparatus according to the  claim 1 , characterized in that the piston rod ( 1 ) of the first cylinder ( 20 ) is hollow in which case it is adjusted to move sealed on top of the inner pipe ( 3 ) and the inner space ( 2 ) of the inner pipe ( 3 ) and the inner space ( 2 ) of the piston rod ( 1 ) function as an expanding space being able to receive hydraulic fluid which is to be directed to the return line at the same time as the impacts occur and during the uplifting of the mass ( 10 ) the movement of the piston rod ( 1 ) removes hydraulic fluid from the mentioned inner space ( 2 ) to the non-pressurized return line of the hydraulic system. 
     
     
         3 . Hammering apparatus according to the  claim 1 , characterized in that the valve arrangement ( 15 ) is adjusted to open a passage for the pressure fluid from the inner space ( 2 ) of the piston rod ( 1 ) and the inner pipe ( 3 ) to the return line of the hydraulic system when the mass ( 1 ) is being lifted up and is adjusted to open a passage for the hydraulic fluid coming back along the pipe ( 14 ) to the mentioned inner space ( 2 ) when the mass ( 10 ) is accelerated for the impact. 
     
     
         4 . Hammering apparatus according to the  claim 1 , characterized in that the annular space ( 5 ), cylinder space ( 4 ) and the inner pipe ( 3 ) are located coaxially in relation to each other. 
     
     
         5 . Hammering apparatus according to the  claim 1 , characterized in that a space ( 5 ) which has a volume which stays constant and is connected through gaps ( 17 ) is attached to the part ( 4 ) of the cylinder space of the first cylinder ( 20 ) filled with gas. 
     
     
         6 . Hammering apparatus according to the  claim 5 , characterized in that the space ( 5 ) staying constant and is connected with the help of the gaps ( 17 ) is formed to be an annular space around the first cylinder ( 20 ).