SE426474B - SAXDOM POWER WITH ADJUSTABLE LEADERS - Google Patents

Description

bn uw <1 0 79Û9257'5 I: firing of the jack.

Another solution to the problem is that the two lower guide arms of a scissor jack support two pins fitted in the base, while the guide pins can move in a vertical groove existing between the two pins. Eccentrically attacking forces are not transmitted torque-free to the base. The unwanted torque automatically leads to overload of one of the pins. On the other hand, the guide pin guided in the vertical groove wears quickly through friction. The system with link arm and pivot pin thereby has excessive play in the pivot points and the intended function as well as stability is no longer guaranteed. Another possibility, to compensate for the additional forces arising from the moment, is shown in the English patent 1,452,421.

By reinforcement in the area of the toothing of the link arm, it must be possible to absorb the additional forces occurring without destroying the toothing.

It is the object of the invention to provide a scissor jack for all insertion possibilities, the main part of which during the lifting process at the vehicle can follow the path of the articulation point without additional forces with their negative effects unilaterally loading the part.

The task of the invention is to provide the main and resp. foot part a greater mobility, whereby the main part attached to the vehicle chassis can follow the path of the articulation point. This is achieved according to the invention in that the head and foot part are pivotally arranged at the lifting pairs which can be adjusted by means of a screw spindle. The lifting arms are rotatably mounted in the head and foot part and connected to each other by a toothing. During necessary repairs, the vehicle is lifted through the jack piece by piece at one side. As a result, the vehicle enters a tilt position. Because the main part of the scissor jack can easily follow this angular change, there is a hinge pin in the head and foot part in kidney-shaped openings. For fixing the starting position of the scissor jack in the unloaded condition, resilient elements are arranged in the main and foot part. The resilient elements are anchored in the head and foot part and press the fitted pivot pin against the intended starting position.

The initiated force b! Due to the changing asymmetry of the lifting arm pair not directly vertically on the foot part. This circumstance has no negative effect on the lifting process. Additional loads on the part, the cause of which was in the immovable, displaced main part and the occurrence of an indeterminate moment, are now avoided.

According to the invention, a scissor jack is achieved with a movable head and foot part, good friction properties and a high utility value.

The invention will be described in more detail with reference to an exemplary embodiment. The accompanying drawings show; fig. 1 scissor jack in initial position, fig. 2 scissor jack in inclined position, fig. 3 foot part with spacer and spring pins in section, fig. 4 spacer in perspective view, fig. 5 foot part with spring package.

The scissor jack according to Figs. 1 and 2 consists of a main part 1 and the foot part 2. Both parts are movably connected by lifting arms 3 and 4 as well as 5 and 6. The spindle 7 transmits from the hand crank the achieved manual force to the lifting arms 3 to o. and foot portion 1; 2, the lifting arms 3 to 0 are connected to each other by a tooth.

Pig. 3 shows the foot part with a spacer in section. To secure the ignition against side bending and for position fixation of the movable pivot pin 10; 12 is located between the two bearing plates in the main and foot part 1; Z in each part a spacer 8. The spacer 8 has recesses for supporting the fixed and the movable hinge pin. The bearing plates have the movable pivot pins 10; 12 kidney-shaped openings.

Fig. 4 shows the design of the spacer 8. The spacer 8 is fixed with a spring pin 13 and a compression spring 14 between the bearing plates at the main and foot part 1; 2 by screwing in or riveting. Changes the movable pivot 10; 12 position, the spacer 8 rotates around the fixed guide pin 9; 11. For position fixation of the pivot pins 9; 11 and projecting the movable pivots 10; 12 inner spacer 8 semicircular recesses. A simplified embodiment for supporting the movable pivot pins 10; 12 is shown in Fig. 5. The spring package 15 consists of an elastic material and is adapted in size and shape to the movable pivots 10; 1Z. In the unloaded state of the scissor jack 7909257-3 4, in connection with the spacer S, the guide pins 10; 12 one: noted starting position. Affected by the inclination of the chassis and the load to be lifted; the spring package 15 is more or less summed.

Claims (4)

...__ _ __ í 7909257-3 Patentkrav Scissor jack with adjustable pivots, two lifting arms and a spindle for lifting and lowering vehicles, characterized in that in a main and foot part (1; 2) next to a fixed pivot (9; 11) in kidney-shaped openings each has its adjustable hinge pin (1U; 1I) and that a spring-loaded spacer (8) or spring package (151 fixes the initial position of the adjustable hinge pins (10; 12) and allows a limited local adjustment inside the kidney-shaped openings. Scissor jack according to Claim 1, characterized in that at the main and foot part (1: 2, a preferably round spacer (8) fixes the movable guide pins (10; 12) in their end positions between the bearing plates. Scissor jack according to claims 1 and 2, characterized in that the end sides of the spacer (S) abut against the toothing of the air arms (3 and 5 and 4 and 6, respectively) and that at the periphery of the spacer (8) there are semicircular recesses for receiving of the pivot pins (9 and 10 and 11 and 12, respectively) are arranged. Scissor jack according to claim 1, characterized in that a spring package (15) of elastic material is arranged as a resilient element between the movable guide pin (10 and 12) and the main and foot part (1; 2).