What Does No Axial Thrust on Hinge B Imply in Statics?

[fayan77]

Hello, i"m having a little trouble recognizing the reaction forces in 3d. To begin what does it mean when the question states "assume there is no axial thrust on hinge B?" on the following question. don't know how to upload picture here but there is a sheet of plywood on the ground and the there are two hinges on the x-axis 22 inches apart B is farthest from the origin.

 

[anorlunda]

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[jack action]

what does it mean when the question states "assume there is no axial thrust on hinge B?"

There are no forces in the direction parallel to the rotational axis of hinge B, acting on hinge B.