BACKGROUND OF THE INVENTION

FIELD OF INVENTION

The invention relate to a mechanism employed for retrieving of side stand in two wheeler semi automatically by using ratchet and pawl.

BACKGROUND OF THE PRESENT INVENTION

A kickstand is a device on a bicycle or motorcycle that allows the bike to be kept upright without leaning against another object or the aid of a person. We may have witnessed motorcycle accidents because of the surface hindrance of retracted positioned side stand. One of the most common problems that are encountered in using the side stand is negligence or carelessness to kick back the side stand. The negligence may be due to absence of mind, urgency, divergence in concentration and few other reasons, which may prevent the rider to kick back the side stand to its original position (released position). Failure to kick back the side stand for any of the reasons stated above may hit the side stand to surface of road and there by affect the stability of the vehicle and lead to accident of the vehicle and riders involve in the accident, sometimes fatal. About 13 people die every hour due to automobile accidents in India. About 36% of these accidents are due to negligence in lifting the side stands. We have developed a mechanical arrangement which will cause the side stand to retrieve automatically as the vehicle gear is shifted.

US 20050179229 disclose an assembly comprises a rotatable strut and an actuator attachable to the frame of a vehicle having two wheels. The actuator operates to rotate the strut between an up position and a down position. In the down position, the strut comes in contact with the ground and maintains the vehicle in a substantially upright position. The side stand assembly may sense when a transmission of the vehicle is in a neutral position and allow operation of the assembly only in neutral. When the vehicle is not in neutral, the actuator moves the strut to the up position and locks the side stand assembly.

US 4095823 discloses an spring normally urging the side stand in a direction of being deflected towards a retreated position; a lock member for retaining the side stand in a service position; a rotary member having a projection thereon and adapted to rotate when the motorcycle is started to run; a lever pivotally supported by a pin mounted on the body of the motorcycle and adapted to project within the passage of rotation of the projection; and a cable or rod interconnecting said lock member and said lever, such that, in association with the movement of said lever, caused by the rotation of the projection, in a direction to be retracted from the passage of rotation of the projection, said lock member is allowed to release the side stand.

IND 258645 discloses an assembly consists of a pin locking mechanism is used to. lock the side stand. Connecting wire is connected from the clutch lever to pin locking mechanism. Bolt and nuts are used to clamping the pin locking mechanism and connecting cables. While parking the vehicle the side stand is brought to the bottom most position and locked with pin locking mechanism Lock is opened by means of clutch lever action manually. Due to pulling to clutch lever the slider lock is opened through cable line. When the upward motion of the slider pin is released from the lock and the stands goes to initial position by means of spring tension. The side stand mechanism is not released in rest position of the vehicle, because the total weight of the vehicle is applied to the side stand and it will not release the side stand due to the clutch operation.

SUMMARY OF THE INVENTION

One aspect of the present invention is to ensure safety of the rider, during absence of mind, negligence, urgency or carelessness. A ratchet consists of a round gear or linear rack with teeth, and a pivoting, spring loaded finger called a pawl that engages the teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge. When the teeth are moving in the unrestricted (i.e., forward) direction, the pawl easily slides up and over the gently sloped edges of the teeth, with a spring forcing it (often with an audible 'click') into the depression between the teeth as it passes the tip of each tooth. When the teeth move in the opposite (backward) direction, however, the pawl will catch against the steeply sloped edge of the first tooth it encounters, thereby locking it against the tooth and pre.venting any further motion in that direction.

In our project initially pawl'gets engaged with one of the teeth of ratchet wheel. So that the ratchet wheel is arrested from motion due to engagement. Damping spring is used to keep the pawl always compressively contact with ratchet. When the rider shift the gear by using clutch and gear shifting lever to move the vehicle, the pawl gets disengaged from the ratchet wheel by means of a pressure force on pawl pin (106) given by downward motion of shifter so that the stand is pulled by another tensile spring attached with the stand automatically.

THE OVERALL ASSEMBLY WORKS AS FOLLOWS
A ratchet consists of a round gear or linear rack with teeth, and a pivoting, spring loaded finger called a; pawl that engages the teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge. When the teeth are moving in the unrestricted (i.e;., forward) direction, the pawl easily slides up and over the gently sloped edges of the teeth, with a spring forcing it (often with an audible 'click') into the depression between the teeth as it passes the tip of each tooth. When the teeth move in the opposite (backward) direction, however, the pawl will catch against the steeply sloped edge of the first tooth it encounters, thereby locking it against the. tooth and preventing any further motion in that direction.

In our project when the gear is shifted pawl is engaged with one of the teeth of ratchet wheel. So that the wheel is restricted from motion. Damping spring is used for restricting that motion. When the gear is shifted pawl is disengaged from the ratchet wheel so that the stand is pulled by another spring kept adjacent to the stand.

BRIEF DESCRIPTION OF THE DRAWING

Further objects and advantages of this invention will be more apparent from the ensuing description when read in conjunction with the accompanying drawings and wherein: Fig 1 is a Pro-E model of overall assembly of side stand lifter. Fig 2 is an orthographic view of overall assembly

DETAILED DESCRIPTION OF THE DISCLOSED EMBODIMENT

The following description details the preferred embodiments of the disclosed invention, it is to be understood that the invention is not limited in its application to the details of construction and arrangement of the parts illustrated in the accompanying drawings, but includes all variations and modifications within the scope of claims.

Gear lever (TOO) is a component used to control the gearing mechanisms and select the desired gear ratio. Typically, they operate either a derailleur mechanism or an internal hub gear mechanism. In either case, the control is operated by moving a cable that connects the shifter to the gear mechanism. Shifters are mounted on the down tube of the frame, stem, or various locations on the handlebars. Manufacturers of shifters include Shimano, Campanology, and SRAM. Shifter controls are mounted so that the right shifter controls the rear derailleur and the left shifter controls the front derailleur. For hub gears, the control is also mounted on the right. Various shifters designs have included friction shifters and index shifters, which do not require fine-tuning during a gear change, as well as shifters integrated with the brake controls.

Side stand (104) style kickstand is a single leg that simply flips out to one side, usually the non-drive side, and the bike then leans against it. Side stands can Be mounted to the chain stays right behind the bottom bracket or to a chain and seat stay near the rear hub. Side stands mounted right behind the bottom bracket can be bolted on, either clamping the chain stays or to the bracket between them, or welded into place as an integral part of the frame Ratchet (102) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. A ratchet consists of a round gear or linear rack with teeth, and a pivoting, spring-loaded finger called a pawl that engages the teeth. The teeth are uniform but asymmetrical, with each tooth having a moderate slope on one edge and a much steeper slope on the other edge.

Pawl (101) may refer to a common component of a ratchet a part of the adjustable height locking mechanism of an extension ladder Pawl (constructor), a former racing car constructor a part of a table saw splitter, a safety mechanism designed to prevent kickback.

Coil spring (103), also known as a helical spring, is a mechanical device, which is typically used to store energy due to resilience and subsequently release it, to absorb shock, or to maintain a force between contacting surfaces. They are made of an elastic material formed into the shape of a helix which returns to its natural length when unloaded the quality of spring is judged from the energy it can absorb. The spring which is capable of absorbing the greatest amount of energy for the given stress is the best one. Metal coil springs are made by winding a wire around a shaped former - a cylinder is used to form cylindrical coil springs

CLAIMS

1. We claim a side stand lifter system of a vehicle associated with a gear lever (100)
comprising:

i) a ratchet wheel mechanism 102 comprising a pawl 101 that locks said side standi 04 at a
position supporting said vehicle;

(ii) At least one pawl pin 106 that connected to said a pawl 101, wherein when said gear
lever is pressed said ratchet wheel mechanism 102 releases said side stand 104 from said
position.

(iii) A helical spring 103 at said side stand 104 that moves said side stand 104 to a position
that is not supporting said vehicle.

2. We claim A method for lifting a side stand of a vehicle, said method comprising:

(i) locking said side stand to a bottom most position using a ratchet and pawl mechanism; (ii) pressing a gear lever to open said ratchet and pawl through a connecting pin; and (iii) moving said side stand in upward motion to a position not supporting said vehicle using spring tension of a helical spring 103.