Abstract:
The invention relates to a modernization method for converting a hydraulically actuated elevator system into an elevator system (1) driven by a drive machine (3) having a drive sheave (4), wherein said modernization method makes it possible to convert and retain some essential elements of the existing elevator system. Cab support rollers (14, 15) are arranged beneath an underside (27) of an elevator cab (13) in the area of points (52, 52') of the underside (27) of the elevator cab (13) located opposite each other and are connected to the elevator cab (13). Furthermore, a support means (20) is guided along the underside (27) of the elevator cab (13) and about the cab support rollers (14, 15). The support means (20) is also guided about the drive sheave (4) so that the support means (20) can be driven by the drive sheave (4) of the drive machine (3) in order to actuate the elevator cab (13), in other words, to raise and lower the elevator cab.
Abstract:
The invention relates to a lift (10) comprising a lift cabin (14), said lift having support means that form a 4:1 suspension for the lift cabin and that are looped several times beneath the lift cabin. Several parallel, flat belts (16) are used as the support means and the pulleys (15.1.1 - 15.2.3, 18.1.1 -18.2.3) of at least one fixed pulley group (15, 18) that diverts the belts are positioned in such a way that the belt sections of the parallel belts (16) lie vertically above one another in the vicinity of said belt diversion.
Abstract:
The invention relates to a lift (10) with a cab (11) guided on guide rails (12) and with a safety brake (1) which is arranged on the cab (11) and is designed to exert a braking force onto the guide rails (12) if a safety criterion is not met. The safety brake (1) comprises: a brake housing (2) having: a wedge-shaped opening in which at least a part of a guide rail (12) can be introduced; a brake body (3) that can be introduced in the wedge-shaped opening between a surface of the brake housing (2) delimiting the wedge-shaped opening and a guide surface of the guide rail (12); an activation mechanism (4) by means of which an activation force can be transmitted onto the brake body (3) and via which the brake body (3) can be pressed onto the delimiting surface and the guide surface; and a release mechanism (5) that is indirectly or directly connected to the brake body (3) and holds the brake body (3) in a rest position against the activation force. The invention is characterized in that the release mechanism (5) has at least one articulated arm (6) which can be brought into an extended position and a bent position. In the extended position, the articulated arm (6) holds the brake body (3) in the rest position, and in the bent position it releases the activation force for transmission to the brake body (3).
Abstract:
The invention relates to an apparatus (100) and to a method for performing a load test in an elevator installation (10), which comprises an elevator car (11) and a counterweight (12), which are connected to one another by means of supporting means (13). Furthermore, the elevator installation (10) comprises a drive brake (18) in order to be able to halt the elevator car (11) during a downwards journey. The apparatus (100) comprises a connecting element (102) for fastening to the counterweight (12), an element with spring properties (103) and a tensioning means (101) for installation in the elevator installation (10). One point of the tensioning means (101) can be fixed on a stationary point (P1) of the elevator installation (10) via the element with spring properties (103). Another point of the tensioning means (101) can be connected to the counterweight (12) via the connecting element (102), wherein the tensioning means (101) comprises actuating means (104) which make it possible to tension the element with spring properties (103) in order to thereby exert a downwardly directed tensile stress (F) on the counterweight (12).
Abstract:
A lift drive (20) serves to drive and to detain a lift car, and it essentially contains a traction wheel (22) for transmitting a driving or detaining force to the lift car, a motor (21) for driving the traction wheel (22), and a braking arrangement for detaining the traction wheel (22). A drive shaft (2) connects the traction wheel, the motor and the braking arrangement to one another. The braking arrangement contains at least two braking devices (24.1, 24.2), wherein, according to the invention, the traction wheel (22) is arranged between the braking devices (24.1, 24.2). This is advantageous, since the braking torques (MB1,2) which are transmitted by the traction wheel (22) to the braking devices (24.1, 24.2) are divided. In the case of an advantageous, symmetrical division of the braking devices (24.1, 24.2), half on either side of the traction wheel, a torque which is to be transmitted is reduced by half in the drive shaft (2). A risk of failure or risk of breakage of the drive shaft (2) is thereby significantly reduced. In addition, during a possible failure of the drive shaft (2), there continues to be a braking function, since the braking devices (24.1, 24.2) are distributed on both sides of the traction wheel (22).