Arrester for roller door, roller shutter etc. lifting drive - whose hub has two firmly coupled brake hubs with rotary cam disc in between

The arrester incorporates a hub, corotatably joined to the lifting gear to drive a ratchet wheel, using a speed-controlled release which at overspeed causes a pawl to engage the ratchet and cutout the drive power. The hub (11) has a corotatably connected two brake hubs (16,17) and rotary cam disc (22) between the two hubs. - Cam faces (20,22) round the disc engage one another with humps and recesses in the free-sheel setting, with the cam disc fixed to the ratchet wheel (23). The two brake humbs diverge on the arrester hub axially against a spring, when adjoining cam faces ride onto one another and the ratchet is blocked. The brake hubs have friction surfaces (18), which work with friction surfaces (19) on a housing (1), when the hubs move apart. The arrester incorporates a hub, corotatably joined to the lifting gear to drive a ratchet wheel, using a speed-controlled release which at overspeed causes a pawl to engage the ratchet and cutout the drive power. The hub (11) has a corotatably connected two brake hubs (16,17) and rotary cam disc (22) between the two hubs. Cam faces (20,22) round the disc engage one another with humps and recesses in the free-sheel setting, with the cam disc fixed to the ratchet wheel (23). The two brake humbs diverge on the arrester hub axially against a spring, when adjoining cam faces ride onto one another and the ratchet is blocked. The brake hubs have friction surfaces (18), which work with friction surfaces (19) on a housing (1), when the hubs move apart. ADVANTAGE - Reduced stress, and increased brake force.