DE3728194A1 - Short armchair or recumbent bicycle - Google Patents

Abstract

An armchair bicycle having a short wheel base is presented. In this arrangement, the crank wheel is located above the front wheel. The rider's seat is equipped with a high back. The latter can be used as a fulcrum and permits a better utilisation of force.

Description

Scope and target group

For cyclists it is becoming a conventional bike and already common long "chair bike" offered an alternative.

State of the art and critical appraisal

Regarding the conventional classic bike, mine are No further explanations are required. With The bike of our day consists of surprisingly few variations two, usually the same size wheels and a crank wheel between these. A chain drive tracks from the crank wheel rear, which drives the rear wheel. When designing the frame often differentiate between men's and women's bikes.  

This arrangement of tires, frame and crank wheel leads to an im essential upright sitting position, however, a high Has wind cross section. Tried on the so-called racing bikes to compensate for this disadvantage by having the handlebars particularly deep. This way the driver forced to adopt a stooped position. Nevertheless, the crank wheel is very deep, which is what Wind cross section still left quite large. Especially at Higher speeds become a big part of that when cycling applied energy is consumed by the air resistance.

Another major disadvantage of the "racing bike" is, however in the driver's cervical spine, when he is wants to overlook the street. For a comfortable driving style the racing bike is therefore not suitable. There are health concerns to register because of the overstretching of the cervical spine and the "pinched internal organs" by the bent posture.

With the development of the long recumbent bike (= chair bike) eliminates many of the disadvantages mentioned above:

Due to the legs stretched almost horizontally forward on the one hand, and thanks to the comfortably lying back Sitting position, the wind resistance is significantly reduced. The completely relaxed posture increases driving comfort increased. In the event of a collision, it is not the head that is in front, but the front Legs, which increases active and passive safety.

The disadvantage of this construction is the length of this vehicle type. This type of recumbent bike is approx. 80-100 cm longer than a conventional, so-called "normal bike". This increases also the weight. The maneuverability is also reduced. By the driver's low seating position is an overview of that Traffic events impaired.  

task

The object of the invention is another Optimization, especially the disadvantages just mentioned to fix the long deep chair bike.

These are:

• 1. the length of the bike
• 2. the deep sitting position
• 3. the greater weight.

Solution of the task

The object is achieved in that the Driver's chair is raised over the rear wheel. The weight of the Driver is essentially carried by the rear wheel. The Length of the bike is significantly shortened by the fact that Crank wheel is attached over the front wheel. The front wheel can be kept much smaller because of the driver's weight is mainly carried by the rear wheel and the front wheel in primarily serves the control. The bike can because of this Construction should be kept so short that at best it was not is longer than the maximum leg length + half a diameter of the Rear wheel. The best possible seat consists of a fixed one flat, ideally padded seat with firm Backrest and backward tilt. The seat back can be used as Counter bearing to the crank wheel.  

Achievable advantages

• 1. This armchair or recumbent bike is much shorter than that long recumbent bike and significantly shorter than a normal bike.
• 2. The very low sitting position of the long recumbent bike is avoided. There is a better overview of that Traffic events. Because of the better "viewer position" it is also superior to the conventional bicycle.
• 3. Weight is saved due to the compact design.
• 4. The transport option (trunk, car roof) is improved (the seat is easily removable).
• 5. As with the long recumbent bike, the wind resistance is with the short one Chair or recumbent bike significantly lower, both compared to conventional bike, as well as compared to the so-called Racing bike.
• 6. The seating comfort is incomparably better than with the racing bike and on a normal bike.
• 7. The acceleration power is greater than the conventional one Bicycle and road bike because the backrest is more rigid Support point can be used (one can use more force bring in as corresponds to the body weight!). Also the The maximum speed of this bike is higher. (The previous Bicycle speed world record is with a long one Recumbent bike, not ridden with a racing bike, see hobby July 87 edition.)

Claims (3)

1. Chair bike with a short wheelbase (= short recumbent or chair bike), characterized in that the crank wheel is located above the reduced front wheel. The driver's seat is above the rear wheel height. 2. short wheelbase armchair bicycle according to claim 1, characterized, that the crank wheel is over the front wheel. 3. armchair bike with short wheelbase according to claim 1 and 2, characterized, that the driver's seat consists of a small seat plate and a high backrest (at least 30 cm) with an inclination to the rear.