PL179865B1 - Hydraulic key - Google Patents

Abstract

1. A hydraulic wrench consisting of a housing, a hydraulic actuator attached thereto and a ratchet wheel pivotally mounted in the housing, characterized in that it has a connecting rod (4) articulatedly connected at one end to the piston (3) of the hydraulic actuator (2), the other end of which is pivotally connected to one end of a lever (6) having the other end pivotally mounted on a pin (7) placed in the housing (1) and a connector (8) pivotally connected at one end to the lever (6) between its ends, the other end of which is also pivotally connected to a clamp (11) with a drive segment (12) mounted therein that engages with a toothed ratchet wheel (13) pivotally mounted in the housing (1)

Description

The subject of the invention is a hydraulic socket wrench for assembly and disassembly of bolted connections with a large thread diameter and requiring the use of high torques.

A hydraulic wrench is known from the Polish patent specification No. 161749 having two drive arms connected to each other in a joint, which, by means of teeth, engage with an opposing ratchet gear mounted on a driving link. The drive arms are short-circuited with each other by means of a spring that presses them against the teeth of the wheel in working motion. One drive arm is connected in a joint with the piston rod of the actuator. The driving connector is located centrally in the wheel axis and is secured on the outer side of the frame with a cotter pin and is replaceable, with the possibility of putting it on from two directions depending on the direction of the working torque on the screw joint. A ratchet is built into the gear.

The essence of the hydraulic wrench according to the invention consists in the fact that a connecting rod is articulated at one end to the piston of the hydraulic cylinder, the other end of which is pivotally connected to one end of the lever, the other end being rotatably mounted on a pin placed in the wrench housing. A connector is pivotally connected to the lever between its ends at one end, the other end of which is also pivotally connected to the clamp with a drive segment embedded therein, meshing with a toothed ratchet wheel rotatably mounted in the housing. The distance from the rotational seating of the lever end on the pin to the pin connection point, constituting the leverage ratio, is from 0.1 to 0.7 of the total active length of the lever.

In the key according to the invention, thanks to the creation of a one-armed lever, when the connector is mounted along the length of the lever, the torque has been increased several times with relatively small dimensions of the key. This key can be used in places with limited access to connections. Converting the key to the required dimension of the bolt joint is done quickly and simply by changing the driver sockets that come with the key and the appropriate setting of the movable support and the key position. The key has the ability to set the torque to a specific value, setting the scaled pressure of the hydraulic unit supplying the actuator.

The subject matter of the invention is shown in the embodiment in the drawing which shows the key in longitudinal section.

179 865

The wrench according to the invention has a housing 1 connected to a double-acting hydraulic cylinder 2, which includes a piston 3 with a connecting rod 4. The connecting rod 4 is connected by a joint 5 to one end of the lever 6 and its other end is rotatably mounted on a pin 7 in the housing 1. The lever 6 is connected is a connector 8, through the pins: of the connector 9 and the clamps 10, with the clamp 11. In the clamp 11 there is a driving segment 12, cooperating with a ratchet gear 13. The driving segment 12 is secured by the spring 14. The rotary support 15 is mounted to the actuator 2 and the fixed support 16 is attached to the housing 1. The hydraulic fluid for the actuator drive 2 is supplied through conduits connected to quick couplers 17.

179 865

Publishing Department of the UP RP. Circulation of 60 copies

Price PLN 2.00.

Claims (2)

Patent claims 1. A hydraulic wrench consisting of a housing, a hydraulic cylinder attached to it and rotatably mounted in the ratchet wheel housing, characterized in that it has a connecting rod (4) articulated with one end connected to the piston (3) of the hydraulic cylinder (2). it is rotatably connected with one end of the lever (6) having the other end pivotally mounted on the pin (7) placed in the housing (1) and to the lever (6) between its ends pivotally connected at one end with a link (8), the other end of which is also pivotally connected to the clamp (11) with the driving segment (12) embedded in it, meshing with the toothed ratchet wheel (13) rotatably mounted in the housing (1). 2. A hydraulic wrench according to claim 3. The method of claim 1, characterized in that the distance from the pivot point of the lever (6) to the pin (7) to the connection of the link (8) with the pin (9) on the lever (6) is 0.1 to 0.7 of the total active length of the lever (6).