DE102016100661B4 - rise chair - Google Patents

Abstract

Stand-up chair with a frame (3) on which a stand-up unit (4) is arranged, with which a seat (41) which is pivotably attached to the front part of the frame (3) is connected and which can be moved from a sitting position to a seated position via an actuator (5). Standing position can be brought, characterized in that between the seat (41) and the frame (3) an elastic element (7) is arranged, which in the sitting position a relative movement of the seat (41) relative to the frame (3) by a spring travel ( W) allowed, which shortens during the movement of the seat (41) from the sitting position to the standing position.

Description

The invention relates to a stand-up chair with a frame on which a stand-up unit is arranged, to which a seat which is pivotably attached to the front part of the frame is connected and which can be brought from a sitting position into a standing position via an actuator. In particular, the invention relates to an upright wheelchair with a chassis to which two drive wheels and at least one steerable wheel are attached.

A Aufstellstuhl described above is for example in US 2010/0 007 180 A1 described.

The U.S. 2010/0 207 354 A1 discloses an erecting unit for a wheelchair with a support and an erecting frame which is articulated on the support and has a seat-carrying seat carrier. A backrest support carries a backrest and the backrest can be held upright both in the sitting position and in the standing position of the user via a first lever parallelogram. Means are provided to move the backrest to the rear end of the seat when changing from the sitting position to the standing position, the first lever parallelogram having a first double-armed parallelogram lever. In order to allow practically no relative movement between the user's thighs and the seat and between his back and the backrest during the raising and lowering movement of the raising unit of the user, provision is made to form a second double-armed parallelogram lever on the first lever parallelogram and to use the arms of the two double-armed parallelogram levers to design two further levers to form a second lever parallelogram. The common fulcrum of the two lever parallelograms is articulated via a lever to a first point of the footrest and the common fulcrum of the other levers of the second parallelogram is articulated to a second point of the footrest.

The U.S. 7,845,665 B2 discloses a wheelchair having a frame and a seat assembly movable in height relative to the frame. The frame is provided with a seat hinge to which a side member is hingedly coupled. The seat back is coupled to the side member so that it can be maintained at a constant angle relative to the frame as the side hinge pivots about the seat hinge and moves. The seat arrangement can be locked in several places using a lockable spring. The spring is made sufficiently elastic to sufficiently absorb shocks in each of the locked positions.

A stand-up wheelchair, for example, is also from the DE 10 2008 024 745 B4 or the DE 10 2005 038 029 B3 known. A wheelchair user's sitting posture for a long period of time leads to the physical deterioration of bodily functions such as reduced mobility of the lower limbs, slowing of bowel movements and deterioration of blood circulation. Sitting also increases the risk of decubitus. A stand-up wheelchair helps to reduce these consequences, since changing the posture from a sitting to a standing position reduces the reduction in bodily functions. The swiveling seat is mounted on a chassis with backrest and footrest. Correct adaptation to the user's anatomical needs is a very important criterion for the comfort offered by the wheelchair. The ratio of seat depth and lower leg is determined based on the body dimensions of the user. A stand-up wheelchair is selected and manufactured from a manufacturer's standard program according to the determined dimensions.

Standing wheelchairs also offer the user the opportunity to do sports. For example, the disabled person can play golf. In such a case, it is particularly important that the wheelchair offers a high level of stability in the upright standing position. For example, one requirement is that the footrest stands up on the ground or is supported on it in the upright position. The backrest must be parallel to the seat and the golfer must be given sufficient freedom of movement (rotation of the upper body) to be able to swing to the shot.

The required safe standing of the user in the standing position of the seat requires that the seat and backrest are rigid to one another and in relation to the chassis. The user must be able to lean against the standing position without the components giving way. The wheelchair can also be driven in the seated position of the seat. Comfort means that bumps in the road are not transmitted undamped to the user, so that high demands are placed on the suspension of the chassis compared to the wheels. Damping and springing properties can also be influenced to a certain extent by the upholstery of the seat, but there are limits because the user of the wheelchair is often immobile in the seat and the seat upholstery must therefore also take on a supporting function.

Based on this problem, the stand-up chair described at the outset is to be improved in terms of comfort, while stability must remain unimpaired. In the case of an upright wheelchair in particular, the driving comfort should be improved while maintaining stability.

To solve the problem, an elastic element is arranged in a generic stand-up chair between the seat and the frame, which in the sitting position allows a relative movement of the seat relative to the frame by a spring deflection that decreases during the movement of the seat from the sitting position to the standing position. The elastic element is preferably a spring.

This design means that the seat is additionally spring-loaded relative to the frame, and the spring hardness can be influenced by selecting a suitable spring. As long as the chair is in the sitting position (the wheelchair is moving), the seat can move relative to the frame (chassis). If the seat is moved to the standing position, the suspension becomes harder because the suspension travel is reduced. Due to the stiffening suspension, the relative movement of the seat to the chassis is reduced, so that the stability of the seat is not only guaranteed objectively, but also subjectively felt by the user.

The spring deflection is preferably zero when the seat is in the standing position, so that the seat surface and backrest are rigid with respect to one another and with respect to the frame.

In order to make it possible to reduce the spring deflection, it is preferably provided that the elastic means (the spring) is articulated with its end facing the seat on a toggle lever that can be pivoted about an axis of rotation and the actuator with its end facing away from the seat on the toggle lever between the articulation of the Spring and the axis of rotation is articulated. A telescopic cylinder, in particular preferably a motor-driven one, a spindle drive or a toothed rack can be used as an actuator. A compression spring is used as the spring.

The arrangement of the spring and the actuator on the toggle lever is preferably such that the connecting lines between the pivot points of the spring and the actuator and the pivot point of the toggle lever on the chassis form a triangle.

If, in such a configuration, the longitudinal axes of the spring and the actuator run parallel or at an acute angle of less than 10° to one another in the sitting position of the seat, and run at right angles or at an angle of at least 80° in the standing position of the seat, the spring can are compressed in the seated position because a force component can be introduced into the suspension in the direction of the longitudinal axis of the spring via the seat or the actuator. If the longitudinal axis of the actuator is perpendicular to the longitudinal axis of the spring or at the large obtuse angle, no force can be introduced into the spring via the seat or the actuator because there is no or only a very small force component in this direction. If the longitudinal axes are perpendicular to each other, there is no force component at all, so the suspension is completely switched off. If the angle is sufficiently large, a force component is at most so small that it has no effect on the suspension, so that even if the user supports (leans) his entire weight on the upright seat, no relative movement between the seat and the chassis can take place.

The toggle lever is preferably formed by two mutually parallel spaced plates, the spring and the actuator being articulated centrally between the plates.

The plates are preferably held at a distance by bolts, with the actuator being able to act on a first bolt and the spring on a second bolt.

A stop limiting the spring deflection in the sitting position is preferably provided between the seat and the frame. The spring can thus be protected from excessive loads. The stop is preferably an elastic buffer and is particularly preferably made of an elastomeric material.

• 1 - die Seitenansicht eines Aufrichtrollstuhls;
• 2 - die perspektivische Darstellung des Sitzes in der Sitzposition;
• 3 - den Sitz nach 2 in einer Ansicht von unten;
• 4 - die Darstellung nach 3 in der Stehposition des Sitzes;
• 5.1 - einen Längsschnitt durch einen Sitz in Sitzposition mit maximaler Einfederung;
• 5.2 - die Darstellung nach 5.1 in unbelastetem Zustand;
• 5.3 - den Schnitt nach 5.1 in der Stehposition des Sitzes;
• 6 - eine schematische Darstellung des Kräfteparallelogramms in der Sitzposition (unbelastet);
• 7 - das Kräfteparallelogramm nach 6 in der Stehposition.

With the help of a drawing, the invention will be described in more detail below using the example of a stand-up wheelchair. Show it:

• 1 - the side view of a stand-up wheelchair;
• 2 - the perspective view of the seat in the sitting position;
• 3 - the seat after 2 in a view from below;
• 4 - the representation after 3 in the standing position of the seat;
• 5.1 - A longitudinal section through a seat in the seated position with maximum deflection;
• 5.2 - the representation after 5 .1 in an unloaded condition;
• 5.3 - following the cut 5 .1 in the standing position of the seat;
• 6 - a schematic representation of the parallelogram of forces in the sitting position (unloaded);
• 7 - the parallelogram of forces 6 in the standing position.

The wheelchair essentially consists of the chassis 3 with the righting unit 4 attached thereto, the drive wheels 1 and the two steered front wheels 2. The righting unit 4 has a seat 41 with a seat surface 44, a padded backrest 42 and a footrest 43. The raising unit 4 can be pivoted via an actuator 5 . For this purpose, the seat surface 44 of the seat 41 is in a vertical position. The backrest 42 maintains its vertical position and is then parallel to the seat 44. With the pivoting of the seat 44, the footrest 43 is lowered and is supported in the stretched position of the raising unit 4 on the floor.

The actuator 5 is a telescopic cylinder with a longitudinal axis L ₅ . Fastening plates 45 are provided on both sides in the front area of the raising unit 4 , via which the raising unit 4 is firmly connected to the chassis 3 . The actuator 5 is attached at one end to the underside of the seat 41 and at its opposite end to a toggle lever 6 . A compression spring 7 is also connected to the toggle lever 6 with its end facing the seat and is articulated with its other end to a bracket 47, which is connected at both ends to the metal sheets 45 via a tube 46, so that one end of the spring 7 is fixed is connected to the chassis 3 and the spring 7 is thus effective between the seat 41 and the chassis 3.

The toggle lever 6 is formed by two triangular plates 61, 62 spaced parallel to one another. The distance is maintained by bolts on which the plates 61, 62 are fixed. The bolts run transversely to the longitudinal axis L ₇ of the spring. The toggle lever 6 is mounted in the bracket 47 so that it can pivot about an axis of rotation A ₆ . The end of the actuator 5 facing away from the seat 41 is pivotable about an axis of rotation A ₅ . The arrangement of the spring 7 and the actuator 5 on the toggle lever 6 is such that the connecting routes A ₇₆ between the upper pivot point A ₇ of the spring 7 and the axis of rotation A ₆ of the toggle lever 6, the connecting path A ₆₈ between the axis of rotation A ₆ and the lower pivot point A ₈ of the spring 7 and the connecting section A ₈₇ form a triangle along the longitudinal axis L ₇ of the upper and lower pivot points A ₇ , A ₈ of the compression spring 7 (cf. 5 , 6 and 7 ).

A comparison of 5.1 and 5.2 shows that the seat 41 relative to the metal sheets 45 and thus relative to the chassis 3 is pivotable. The rear part of the seat 41 can shift downwards under load (cf. 5.1 ) whereby the compression spring 7 is loaded because the force introduced via the seat 41 and the actuator 5 onto the toggle lever 6 has a force component which points in the direction of the longitudinal axis L ₇ of the compression spring 7 . There is thus a spring deflection Wein by which the seat 41 can move in relation to the chassis 3 . To limit the spring deflection W, an elastic stop 8 made of an elastomeric material is provided on the chassis 3, against which the underside of the seat 41 can strike.

If the standing unit 4 is erected and the seat 41 is pivoted clockwise, the toggle lever 6 is also pivoted clockwise. The compression spring 7 is relieved by the rotary movement of the toggle lever 6. Like comparing the 5.2 and 5.3 shows, the longitudinal axes L ₅ of the actuator 5 and L ₇ of the compression spring 7 move from their essentially parallel position in the sitting position of the seat 41 to an essentially perpendicular position to one another in the standing position. If, in this position of the stand-up frame 4, a force is exerted on the seat 41 in the opposite direction to the stand-up movement (counterclockwise), this force, which is transmitted via the actuator 5 to the toggle lever 6, has no force component acting in the direction of the longitudinal axis L ₇ of the compression spring 7 , so that a counter-clockwise spring movement of the seat 41 is excluded. With the initiation of the righting movement of the righting frame 4, the actuator 5 also rotates clockwise. The angle between the longitudinal axes L ₇ is thereby increased, so that the force component that can be transmitted by the actuator 5 in the direction of the longitudinal axis L ₇ of the compression spring 7 becomes smaller and smaller, so that the spring deflection W decreases with the uprighting movement, until it is at the latest in the fully upright position ( 5.3 ) is no longer available (W=0).

The 6 and 7 , which show the corresponding route diagram, illustrate the kinematic connection between the toggle lever, the righting movement of the righting frame 4 and the pivot points A ₆ , A ₇ , A ₈ .

Reference List

1

drive wheel

2

steering wheel

3

chassis/frame

4

stand

41

Seat

42

rest

43

footrest

44

seat

45

sheet

46

Pipe

47

hanger

5

actuator

6

knee lever

61

sheet

62

sheet

7

compression spring/spring/elastic element

8th

attack

A6

Pivot/axis of rotation

A7

pivot point

A8

pivot point

A76

connecting line

A68

connecting line

A87

connecting line

L5

longitudinal axis

L7

longitudinal axis

W

travel

Claims (14)

Stand-up chair with a frame (3) on which a stand-up unit (4) is arranged, with which a seat (41) which is pivotably attached to the front part of the frame (3) is connected and which can be moved from a sitting position to a seated position via an actuator (5). Standing position can be brought, characterized in that between the seat (41) and the frame (3) an elastic element (7) is arranged, which in the sitting position a relative movement of the seat (41) relative to the frame (3) by a spring deflection ( W) allowed, which shortens during the movement of the seat (41) from the sitting position to the standing position. rising chair after claim 1 , characterized in that the spring deflection (W) in the standing position of the seat (41) is zero. rising chair after claim 1 or 2 , characterized in that the elastic element (7) is articulated with its end facing the seat (41) on a toggle lever ( ₆ ) pivotable about an axis of rotation (A 6 ) and the actuator (5) with its end facing away from the seat (41). End on the toggle lever (6) between the linkage (A ₇ ) of the elastic element (7) and the axis of rotation (A ₆ ) is articulated. rising chair after claim 3 , characterized in that the link ( A ₇₆ ) between the pivot point (A ₇ ) of the elastic element (7) and the pivot point (A ₆ ) of the toggle lever (6), the connecting section ( A ₆₈ ) between the axis of rotation (A ₆ ) and the pivot point (A ₈ ) of the end of the elastic element (7) facing away from the seat (41) on the frame (3) and the connecting section ( A ₈₇ ) of the pivot points (A ₇ ) of the elastic element (7) on the toggle lever (6) and (A ₈ ) of the elastic element (7) on the frame (3) form a triangle. rising chair after claim 3 or 4 , characterized in that the longitudinal axis (L ₇ ) of the elastic element (7) and the longitudinal axis (L ₅ ) of the actuator (5) in the seated position of the seat (41) run parallel to one another or at an acute angle of less than 10°, and in the standing position of the seat (41) are perpendicular or at an angle greater than 80°. Raising chair after one of claims 3 until 5 , characterized in that the toggle lever (6) is formed by two parallel spaced plates (61, 62) and the elastic element (7) and the actuator (5) are articulated centrally between the plates (61, 62). rising chair after claim 6 , characterized in that the plates (61, 62) are spaced apart by bolts. rising chair after claim 7 , characterized in that the actuator (5) acts on a first bolt and the elastic element (7) acts on a second bolt. Raising chair according to one of the preceding claims, characterized in that a stop (8) limiting the spring deflection (W) in the sitting position is provided between the seat (41) and the frame (3). rising chair after claim 9 , characterized in that the stop (8) is an elastic buffer. rising chair after claim 10 , characterized in that the stop (8) consists of an elastomeric material. Raising chair according to one of the preceding claims, characterized in that the elastic element (7) is a spring. Raising chair according to one of the preceding claims, characterized in that the frame (3) is a wheelchair chassis. rising chair after Claim 13 , characterized in that on the chassis (3) two drive wheels (1) and at least one steerable wheel (2) are attached.

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