Nagative brake device, construction machine, and method of activating negative

Abstract

The present invention includes a hydraulic source (23), a pressure reducing valve (22) that reduces hydraulic pressure from the hydraulic source (23) so as secondary pressure P to become large in accordance with increase in an extent to which a pusher (25) is pressed in, a negative brake mechanism (10) that releases braking by secondary pressure P from the pressure-reducing valve (22) and causes braking to operate in response to cutting of secondary pressure (P), a brake pedal (24) provided so as to pull out the pusher (25) according to a depression operation, and a spring member (27) that pushes in the pusher (25) so as to release braking performed by the negative brake mechanism (10) when the brake pedal (24) is not operated.

Dependencies are inferred from the claim text.