Elevator safety brake arrangement

Elevator safety brake arrangement (20) for being attached to an elevator car (6) or to an elevator counterweight (21) and configured for braking movement of the elevator car (6) or of the elevator counterweight (21) in an emergency situation;

• the elevator safety brake arrangement (20) defining a passage (25) extending in a longitudinal direction (L) and allowing a longitudinal guide member (14, 15), such as a guide rail, to pass through;
• the elevator safety brake arrangement (20) comprising a first safety brake (30) and a second safety brake (40),
• wherein the first safety brake (30) comprises:
• a first brake shoe (32) arranged on one side of the passage (25);
• a first roller (34) and a first elastic element (36) arranged on an opposite side of the passage (25);
• the first elastic element (36) extending at a first angle (α) with respect to the longitudinal direction (L), with a proximal end (36a) of the first elastic element (36) being closer to the passage (25) than a distal end (36b) of the first elastic element (36), thereby defining a first tapered region between the passage (25) and the first elastic element (36),
• wherein the first roller (34) is, at least in an activated condition of the first safety brake (30), located within said first tapered region defined by the passage (25) and the first elastic element (36);
• and
• wherein the first roller (34) is capable of moving along the first elastic element (36) towards the proximal end (36a) of the first elastic element (36) into a wedged condition between the first elastic element (36) and a guide member (14, 15) passing through the passage (25), in which the first elastic element (36) exerts a first pressing force onto the first roller (34);
• wherein the second safety brake (40) comprises:
• a second brake shoe (42) arranged on one side of the passage (25);
• a second roller (44) and a second elastic element (46) arranged on an opposite side of the passage (25);
• the second elastic element (46) extending at a second angle (β) with respect to the longitudinal direction (L), with a proximal end (46a) of the second elastic element (46) being closer to the guide member (14, 15) than a distal end (46b) of the second elastic element (46), thereby defining a second tapered region between the passage (25) and the second elastic element (46);
• wherein the second roller (44) is, at least in an activated condition of the second safety brake (40), located within said second tapered region defined by the the passage (25) and the second elastic element (46);
• and
• wherein the second roller (44) is capable of moving along the second elastic element (46) towards the proximal end (46a) of the second elastic element (46) into a wedged condition between the second elastic element (46) and the guide member (14, 15) passing through the passage (25), in which the second elastic element (46) exerts a second pressing force onto the second roller (44);
• wherein the proximal ends (36a, 46a) of the first and second elastic elements (36, 46) are oriented towards a first end (20a) of the elevator safety brake arrangement (20), and wherein the distal ends (36b, 46b) of the first and second elastic element (36, 46) are oriented towards a second end (20b) of the elevator safety brake arrangement (20), which is opposite to the first end (20a) of the elevator safety brake arrangement (20) along the longitudinal direction (L);
• and
• wherein the elastic properties of the first elastic element (36) differ from the elastic properties of the second elastic element (46).