CS221071B1 - Ratchet Jack - Google Patents

Abstract

A ratchet hoist consisting of a body with a hook, a lifting and retaining mechanism and a lever with a reversing device, in which the shaft (6) passing through the nut hole (3) has an opening (7) aligned with the nut hole (3) at which it is a mounting pin is disposed while a support pin (25) is provided in the riser (24) of the upper body (1j), in which a shank (27) of the flat hook (28) is received with an opening (29) secured by a pin (30) extending at the same time through the opening (31) of the pin (25) secured by the nut (32), a gap being provided between the shoulder (33) of the bearing pin (25) and the top wall (34) of the boss (24) of the body (1).

Description

A ratchet jack comprising a body with a hook, a lifting and restraint mechanism and a reverse gear lever, in which the shaft (6) passing through the nut opening (3) has at its end a hole (7) coaxial with the nut opening (3) a retaining pin is disposed, while in the boss (24) of the upper part of the body (11) there is a bearing pin (25) provided with a groove (26), in which the shaft (27) of the flat hook (28) is inserted with an opening (29) secured by the pin ) extending simultaneously through the bore (31) of the pin (25) secured by the nut (32) ', and a gap is provided between the shoulder (33) of the support pin (25) and the upper wall (34) of the boss (24) of the body (1).

L.

The invention relates to a ratchet jack comprising a body with a hook, a lifting and a retaining mechanism and a lever with a reverse mechanism for lifting, lowering and moving loads suspended on a chain or pulley hook.

Ratchet jacks are known in which, by means of the rocking movement of the hand lever, either directly or by means of a gearing, the nut which carries the load chain rotates. The disadvantage of these jacks is that their construction is not designed for jacks of lower load capacities, which are equipped with non-standard small load carriers. They are particularly adapted to use hooks with conventional shapes requiring relatively large fastening portions. The nut of these jacks is usually common with the shaft, which is particularly disadvantageous in those cases where the nut needs to be replaced to use chains of different dimensions.

The essence of the invention is that the shaft passing through the nut hole has an aperture at the end of the bearing, together with the nut hole, in which the fixing pin is located, while in the boss of the upper body is a bearing pin provided with a groove. a hook with an opening secured by a pin extending at the same time through an opening of a pin secured by a nut, a gap is provided between the shoulder of the pin and the upper wall of the body boss.

The ratchet jack embodiment according to the invention can be advantageously used in light jacks designed especially for lower loads, where non-standard flat hooks are used. The minimal design space with the possibility of changing the nut for different types of load chain allows to significantly reduce the external dimensions and weight to the extent that the ratchet jack by its miniature design deviates from the usual common series of comparable jacks.

The drawing shows an exemplary embodiment of a ratchet jack according to the invention in FIG. 1 in longitudinal section through the jack axis and in FIG. 2 in a side view with a partial section at the hook attachment point.

The ratchet jack consists of a body 1 in which a nut 3 of the load chain 4 is mounted on ball bearings 2, 2 '. The shaft 6 extends through the hole 5 of the nut 3 having an end 7 at the end of the ball bearing 2. A retaining mechanism consisting of a thrust washer 10, brake discs 11, 11 ', ratchet 12 with a latch 13 provided with a spring 14, a housing 15, a drive wheel 16 with a screw segment 17 having identical retaining faces and intermediate spring 18. The retaining mechanism is secured to the shaft 3 by a nut 19 with a lock washer 20 and secured by a lid 21. A hand lever 22 provided with a reversing mechanism operated by a lever 23 is rotatably mounted on the driving wheel 16 In the axis of the load chain 4 a bearing pin 25 provided with dr A space 35 is provided between the shoulder 33 of the bearing pin 25 and the upper wall 34 of the riser 24 of the body 1. In the lower part of the body 1 a load chain extruder 36 is fastened, on which the hook 37 is fastened.

By rotating or rocking the hand lever 22, in accordance with the direction of the reversing lever 22, the nut 3 rotates and thus the load chain 4 is moved. The load secures the retention mechanism in any position. When the pawl 13 is raised and the control lever 23 is set to the middle position, the load chain 4 can be moved any length in the unloaded state.

The ratchet jack according to the invention can advantageously be used for versatile handling of lower weight loads. Due to its small size and low weight 'it is easily mobile while guaranteeing reliable function.

Claims (1)

SUBJECT Ratchet jack consisting of a body with a hook, a lifting and restraint mechanism and a lever with a reverse mechanism, characterized in that the shaft (6) passing through the hole (5) of the nut (3) has a hole (7) at its end ), coaxial with the hole (8) of the nut (3), in which the fastening pin (9) is located, while the boss (24) of the upper part of the ynAlez body (1) accommodates a support pin (25) provided with a groove (26). a shank (27) of the flat hook (28) having an opening (29) secured by a pin (30) extending at the same time through the opening (31) of the pin (25) secured by the nut (32), between the shoulder (33) of the support pin (25); a gap (35) is provided by the upper wall (34) of the riser (24) of the body (1).