Assertion: pocketknife's blade | /r/AtLocation | place
Facets:
value: by a spring device
type: CAUSE
value: by a strong "backspring"
type: CAUSE
value: by tension
type: CAUSE
Source sentences:
text: The blade is in fact held in place by tension.
text: These blades are held in position by a strong "backspring" which biases them towards the open and closed position (that is the spring tries to hold the blade closed until it has been pulled past a 90 degree arc from the handle, when the spring force reverses and the blade is inclined to spring to the open position - or at least resists closing once open.
text: On a slip joint knife, the blade doesn’t lock, but is held in place by a spring device that allows the blade to fold only if a certain amount of pressure is applied.