SU7675A1 - Safety handle for manual lifting mechanisms - Google Patents

Description

The present invention aims to eliminate the rapid reverse rotation of the handle of the hand-held lifting mechanisms when lowering the load. For this, the handle is arranged in such a way that it can automatically be turned off from the shaft of the lifter together with the disk, flywheel or shoulder on which it is located, with all hands removed from it, regardless of whether it is deliberately released. sweat or by accident.

In FIG. 1 shows a front view of a lifter with a safety handle fixed on it; FIG. 2 is a section along the line ABCD in FIG. one; FIG. 3 - view of the handle above.

The disk (flywheel, pulley, shoulder) 1 is mounted on the shaft 2 of the elevator mechanism and sandwiched between two washers 3 and 4. The washer 3 is loosely mounted on the shaft 2 and rests on the retaining ring 5 (or any part of the mechanism wedged on the shaft in place). In order to keep the washer 3 from rotating, it is put on by the hole in it on the stud b, fixedly fixed on the bed 7 of the elevator. The washer 4 is fixed on the shaft 2 with a screw 8, under the head of which a spring washer 9 is enclosed, due to which the disk 1 is clamped elastically between the washers 3 and 4. In order for the washer 4 to rotate simultaneously with the shaft 2, it is fixed on it by a pin 10.

The disk 1 is not wedged in the normal position on the shaft 2, but can be wedged on it with a key that is integral with the rail 11, which goes to the handle and ends with an oblique cut. The spring 12 holds the rail 11 with the key in the off position from the shaft 2, pulling it up. The handle 13 consists of a rod, on which a wooden tube 14 is mounted, and has an obliquely cut foot 17 at the end, an abutting and oblique cut of the rail 11 (Fig. 3). The handle 13 is fixed by means of a bolt 15 to the eyelet 16 fixedly mounted on the disk 1 in such a way that it can swing around the bolt 15, resting against the disk with a front or rear protrusion, which

and limit the size of her swing.

The mechanism operates as follows: when you press the handle 13 with your hand, which is usually in the position shown in FIG. 3 solid lines, the latter moves to the position shown by the dotted line, while the obliquely cut foot 17 presses its wedge-shaped part on the cut of the lath 11 and pushes it down. The key, with which the rail 11 terminates, presses against the shaft 2 and slides along it while rotating the disk 1 until it reaches the key socket. At this moment, the disk 1, and with it the handle 13, are wedged on the shaft 2. The washers 3 and 4, between which the disk 1 is clamped, keep it from running away while pressing the handle 13 on the handle 13.

After switching on, when the shaft 2, and with it, the washer 4 begins to rotate as one piece with the disk 1, the friction between the latter and the faceplate 4 disappears, and only the friction between the disk 1 and the fixed washer remains 3. When the load on the brake is lowered, when the disk 1 is turned off and remains stationary, the action of friction between the washer 4 rotating together with the shaft and the disk 1, which tend to rotate the latter, is destroyed by friction between the disk 1 and the fixed washer 3, due to which the disk remains at rest.

When you release the handle 13, the spring 12 raises the rail 11 up, withdraws it from the key socket on the shaft and, thus, turns off the disk 1, and with it the handle 13 from the shaft 2. An oblique cut of the rail 11, slipping during this movement along the cut of the foot 17 of the handle , takes the latter to the original position shown in FIG. 3 solid lines.

The action of this mechanism is performed automatically, and with just one click on the handle necessary for lifting the load,

P.P.

it is included in the general mechanism of the lifter, and it also automatically switches off as soon as the knob is out of the hands, and switching on and off is not in any way dependent on whether the whole gear is rotating in one direction or the other. or remains motionless.

Lifting mechanisms equipped with handles on both sides can only be serviced from one side, while the second handle remains stationary, since each handle is turned on completely independently and is always in the ready to switch on position.

The subject of the patent.

Safety handle for lifting mechanisms manual action, characterized with the use of a key, integral with the rail 11, pressed together with the key from the shaft 2 by the spring 12 and ending with an oblique cut, which the abutment of the handle 17 of the handle 13, fixed by means of a bolt, can abut 15 in an eyelet 16 attached to the disk 1 or another body pivotally mounted at the end of said shaft 2 of the lifting mechanism, between the washers 3 and 4, of which the washer 3 sits freely on the shaft 2 and is kept from spinning The b is fixed in the bed 7, and the washer 4 presses the hub of disk 1 to washer 3 by means of spring washer 9 pulled by the screw 8 to the shaft end 2 in order to keep the disk or other organ from rotating when the key is removed from the keyway and turned off handle-tap from the shaft with a spring 12 of the rail 11, when the disk and the handle with the shaft pressed against the latter together with the key pressing the obliquely cut foot 17 on the oblique cut of the rail 11 produced by turning the specified handle 13 near the bolt 15.