RU2493762C1 - Armchair legs lifting mechanism - Google Patents

Abstract

FIELD: personal use articles.

SUBSTANCE: invention relates to a mechanism for lifting and dropping an armchair leg support. The armchair legs lifting mechanism contains a stationary base installed below the armchair seat and a pull-out leg support positioned under the seat and pivotally connected to the base via a system of levers of the pantograph type. Pivotally mounted on the base are two grips for the mechanism terminal positions (those of opening and closure). The grips are pivotally connected to each other via a rod, the lever consisting of a system of levers pivotally attached to the base and having a means for gripping the grips. The grips are connected to the grips release handle and are spring-loaded.

EFFECT: enhanced reliability of the design and reliable fixation of the support in terminal positions.

6 dwg

Description

The invention relates to chairs having a seat and a back, and the chair has the ability to be unfolded in intermediate positions between the sitting and lying positions.

Armchairs of this type are known and belong to the type of folding furniture. They allow you to adjust the position of the chair between the usual vertical position for sitting and the position of the maximum deflection back, for example, almost horizontal position for lying. In the supine position, the additional leg support can be folded back and forth. This is achieved using retractable leg supports that move with pantographs, flexible rods, etc.

People spend a considerable amount of time in a sitting position, usually sitting at work and at home and while traveling. Usually the seats on which a person sits are not ergonomically optimal for him.

Known chairs have a number of disadvantages. For example, in such seats, drivers of vehicles, office workers at enterprises and workers whose professions are associated with long-term work in a sitting position, experience pressure on soft tissues and muscles under the pelvic bones.

Particularly high pressure on muscle tissue is created under the spherically protruding bones of the lower pelvis and under the femurs. The blood vessels and nerves located in these muscles are strongly compressed, constricted, and normal blood circulation in the vessels is disturbed. As a result of compression by the lower spherical and femur bones, up to 30% of various blood vessels, veins, aortas, and capillaries are also disconnected, and normal blood supply to organs in the abdominal cavity is disrupted. Therefore, a person who periodically, over the years, for a long time (more than 2 hours) is in a sitting position, there is a gradual death of small vessels, blockage of veins, etc., chronic diseases are manifested: arthritis of the legs, hemorrhoids, prostatitis etc.

US Pat. No. 4,765,685 discloses a multi-purpose armchair with a retractable knee stand. The chair consists of a regular office chair with fixtures and adjustments that provide a knee stand, usually located under the seat cushion.

US Pat. No. 4,678,229 discloses a chair that is continuously or continuously adjustable between the vertical position of the seat and the fully folded back position, includes a concave portion of the seat extending into a half-extended portion for supporting legs that combine to form an ergonomically preferred sitting position when the chair is in the fully reclined position.

There is a known mechanism for a folding chair according to WO 2004/034849 A1, which allows you to rotate and simultaneously extend the leg support, in the retracted state, located almost vertically downwards by shifting the seat back. To this end, the mechanism comprises an element, which is mainly fixed and extends forcibly and rectilinearly, which is connected to the frame and pivotally connected to the leg support with the possibility of rotation, as well as a rotatable, rectilinearly extensible element, rigidly connected to the leg support and articulated to rotate with an element that is basically motionless and forcibly linearly advanced. In this case, the retractable elements are made in the form of telescopic profile rods. Part of the profile, mainly fixed rod is connected to the frame, and the other part is pivotally connected to the leg support. Accordingly, a part of the rotary profile rods is rotatably connected to the frame, and another part connected to the leg support is articulated to rotate with a part of said stationary profile rods, which, in turn, is rotatably connected with the leg support. In addition, when moving the seat using the lever system in the form of a parallelogram, the direction of the profile rods changes so that a chair arrangement is obtained in which, despite the simple, stable design, easy travel and harmonious, soft extension of the leg support by turning it are achieved.

However, the design proposed in patent WO 2004/034849 A1 has several drawbacks.

DE 3718645 A1 describes seating furniture with a retractable leg support in which this leg can be rotated between the extreme extended position, in which it is almost on a straight line with the seat, and the extreme folded position, in which the leg support is at least least partially below the seat. The mechanism for raising the legs for a chair comprises a fixed base mounted at the bottom of the seat of the chair and a retractable foot support located under the seat and pivotally connected to the base with a pantograph-like leverage system. However, the design proposed in patent DE 3718645, has several disadvantages.

So, the leg support in the retracted state is located almost vertically down. With this position, the appearance of the chair deteriorates. In addition, I would like to have an easier and more reliable movement of the mechanism of extension and rotation of the leg support, which is directly related to the movement of the seat.

The technical result consists in increasing the reliability in operation and reducing the complexity of the extension of the support with reliable fixation of the support in extreme positions.

This technical result is achieved by the fact that in the mechanism of raising the legs for the chair, containing a fixed base mounted below the seat of the chair and a sliding footrest located under the seat and pivotally connected to the base by a pantograph-like lever system, two hooks of extreme positions are pivotally mounted on the base mechanism - opening and closing, while the hooks are pivotally connected to one another by a rod, and the lever from the system of levers pivotally mounted on the base has a means of engagement with hooks, while atsepy associated with handle and spring loaded release hooks.

The invention is illustrated by drawings, which depict:

figure 1 - General view of the chair;

figure 2 - General view of the chair with extended support;

figure 3 - lifting mechanism when folded, isometric view;

figure 4 - lifting mechanism in the extended position, a view in isometric view;

figure 5 - lifting mechanism when folded, General view;

6 is a lifting mechanism in the extended position, a General view.

One of the rotary levers 1, from the leverage of the mechanism for raising legs, is pivotally fixed to the base 7. The base is attached to the bottom of the seat of the chair. The gear 1 is fixed on the lever 1 to interact with the hooks 3 and 4. The gear 2 can be made in the form of a rod with which the hooks of the first end position of the “Opening” 3 and the hooks of the second end position of the “Closing” are pivotally mounted on the base 7 four.

The hooks 3 and the hooks 4 are pivotally connected to each other by a rod 5.

The hooks of the first extreme position of the "Discovery", after interacting with part 2, can hold the lever in the first extreme position of the "Discovery".

The hooks of the second extreme position of “Closing”, after interacting with part 2, can hold the lever in the second extreme position of “Closing”.

The hooks of one of the extreme positions can be connected rigidly or not rigidly with the handle for unlocking the hooks 6

The hooks are spring-loaded with at least one spring 8.

The work of the mechanism.

To extend the leg support from under the seat, the release handle 4 is released by the unlocking handle and the mechanism, under the action of the spring 8, makes a plane-parallel movement to the extended position until it clicks with the latch 3 with the rod 2.

To close the support, the latch 3 is released and the user lying on the chair with a movement of the legs puts the support in the idle position until the rod 2 is fixed with a hook 4.

Claims (1)

A mechanism for raising the legs for a chair, comprising a fixed base mounted below the seat of the chair and a retractable foot support located under the seat and pivotally connected to the base by a pantograph-type leverage, characterized in that on the base are two articulated hooks of the mechanism extreme positions - opening and closures, while the hooks are pivotally connected to one another by a rod, and the lever from the system of levers pivotally mounted on the base has a gearing means with hooks, while the hooks are connected to the handle locks of hooks and are spring-loaded.

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