Machine for muscular training

Abstract

A machine intended for back muscular training includes a seat ( 2 ) carried by a stand, a back rest ( 17 ) situated above the seat, as well as a main arm ( 12 ) which is turnable around a main joint ( 13 ) against the effect of a loading device ( 3 ). The back rest ( 17 ) is spaced from the seat and connected to a part of the main arm ( 12 ) extending upwards from the main joint ( 13 ), more precisely via a rocker arm ( 19 ) turnable around a secondary joint ( 20 ) on the main arm, which rocker arm has a cross boom ( 18 ), extending at an angle to the same on which the back rest is mounted. In this way, the back rest ( 17 ) is movable between a front starting position and a rear end position in an orbital path along which the back rest—thanks to the mounting thereof on the rocker arm ( 19 )—can move freely between different radial positions in relation to the main joint ( 13 ) depending on the individual back flexing movements of individual users.

1 . Machine for muscular training, including a seat ( 2 ) carried by a stand ( 1 ), a back rest ( 17 ) situated above the seat, as well as a main arm ( 12 ) which is turnable around a main joint ( 13 ) against the effect of a loading device ( 3 ), characterized in that the back rest ( 17 ) is spaced from the seat ( 2 ) and connected to a part of the main arm ( 12 ) extending upwards from the main joint ( 13 ), more precisely via a rocker arm ( 19 ) turnable around a secondary joint ( 20 ) on the main arm, which rocker arm has a cross boom ( 18 ) extending at an angle to the same on which the back rest is mounted, the back rest ( 17 ) being movable between a front starting position and a rear end position in an orbital path along which the back rest ( 17 )—thanks to the mounting thereof on the rocker arm ( 19 )—can move freely between different radial positions in relation to the main joint ( 13 ) depending on the individual back flexing movements of individual users.  
     
     
         2 . Machine according to  claim 1 , characterized in that the back rest ( 17 ) is connected to the cross boom ( 18 ) via a joint ( 38 ) and loaded by at least one spring, which always aims to hold the back rest in a neutral position parallel to the cross boom, and against the effect of which the back rest is turnable to positions at an acute angle to the cross boom, either towards the right or towards the left.  
     
     
         3 . Machine according to  claim 1  or  2 , characterized in that in the area in front of and below the seat ( 2 ), a leg rest ( 22 ) is arranged, against which the lower parts of the legs of the user are applicable.  
     
     
         4 . Machine according to  claim 3 , characterized in that in the area in front of and below the leg rest ( 22 ), a foot rest ( 27 ) is arranged against which the foot of one leg is applicable at the same time as the lower part of the other leg is applicable against the leg rest.  
     
     
         5 . Machine according to any one of the preceding claims, characterized in that a damper weight ( 21 ) is arranged on an end of the rocker arm ( 19 ) distanced from the cross boom ( 18 ), with the purpose of automatically holding the rocker arm in a neutral position at an angle to the main arm ( 12 ).  
     
     
         6 . Machine according to any one of the preceding claims, characterized in that a lumbar support ( 28 ) having a limited height is connected to the seat ( 2 ) and extends at an obtuse angle to the same.  
     
     
         7 . Machine according to any one of the preceding claims, characterized in that the same comprises an adjusting mechanism ( 30 ) for variable adjustment of the rear end position of the back rest ( 17 ).