WO1984003074A1 - Vehicle for terrestrial use, particularly a tricycle - Google Patents

Abstract

A vehicle for terrestrial use is equipped with three distantly arranged supporting means (3, 4) for forward movement. Two of these supporting means (3) being displaceable in unison by means of a common steering device (12, 13, 14) and are each pivotally arranged on an extended supporting arm (5) at the front part of the vehicle. The third supporting means (4) being of a traditional nature of support only and each relevant extended pivot (9) of the said two supporting means (3) lying in a common plane which intersects the plane containing the said vehicle's two supporting contact surfaces and the points of support, each extended pivot axis (16) taking a rearward angle of inclination with respect to the vertical plane through the longitudinal axis of the vehicle. The points of intersection (19) of each pivot axis (16) with the horizontal plane of support lying in an outward direction perpendicular to the vehicle's longitudinal axis and sidewardly and outwardly away from each of said points of contact whereby the arrangement being suchlike that while the vehicle traversing a curved path, the vehicle's frame is subjected to a "pendulum" action inthe direction of turning. This "pendulum" actions causes a relative different movement while progressively turning the vehicle's supporting means located at the inner part of the curve moving more in a forward direction, whereas the supporting means located at the outer part of the curve being more retracted with respect to the said forward movement and vice versa.

Description

  
 



   Vehicle for terrestrial use, particularly a tricycle.



   The invention relates to a vehicle for terrestrial use in particular to a tricycle
 having an improved arrangement for turning the vehicle from a straighi
 forward direction into a curve and vice versa. Such a vehicle for terrestria
 use is already known, equipped with three distantly arranged supporting meant
 for forward movement, two of these supporting means being   displaceable   
 in unison by means of a common steering device, said two supporting meant
 being each pivotally arranged on an extended supporting arm at the front
 part of the vehicle, the third supporting means being of a traditional nature
 of support only, each relevant extended pivot axis lying in a common plane
 which intersects the plane containing the said vehicle's supporting contact
 surfaces and the points of support,

   each extended pivot axis taking a rear
 ward angle of inclination with respect to the vertical plane through the
 longitudinal axis of the vehicle, the points of intersection of each pivot
 axis with the horizontal plane of support lying in an outward direction per
 pendicular to the vehicle's longitudinal axis and sidewardly away, in the
 case of a tricycle, from the road contacting points with the front wheels.



   It is an object of the invention to provide for a vehicle of the kind as mentio
 ned before, which, while going into a curve and/or leaving a curved path,
 provides for a special sensation for its driver that in such a curve, the point of gravity of the vehicle is' automatically lowered and displaced to the inner side of the curve, thereby making the driver's comfort optimal and simultaneously overcoming the unpleasant centrifigal forces which normally tend to through a driver in a direction adverse to the direction of turning the vehicle.

  This problem of being subjected to centrifugal forces, not being compensated in any way, neither by the position of the vehicle itself, nor by a changing position of the driver's seat, is solved by a vehicle which, according to the invention provides for a specific arrangement as referred to above in that, in addition said points of intersection also are situated outwardly away of - each of said points of contact, the arrangement being suchlike that while the vehicle is traversing a curved path, the vehicle's frame is subjected to a "pendulum" action in the direction of turning, causing   R    relative different movement while progressively turning, the vehicle's supporting means located at the inner part of the curve are moving more n a forward direction,

   whereas the supporting means located at the outer   zart    of the curve being more retracted with respect to the said forward movement and vice versa. It has been found that the advantages of the invenive arrangement may be more spectacular if in a vehicle according to the  
 invention, each extended pivot axis intersects the opposite pivot axis under
 a sharp angle at a point above the vehicle, the vertical line of projection
 from that point, intersecting with the said plane containing the vehicle's
 supporting contact surfaces and the point of support is located within the
 vertically projected area of circumference of the vehicle.

  It appears possible
 to -   expedience    a range of intersecting angles which allow the vehicle to satisfy
 to the "pendulum" action and it is believed that the angle of intersection for a pivot axis could so range from   53    -   50    depending on other construction features of the vehicle which may also determine the extent of the "pendulum"
 action. Anyhow, the vehicle's body is more or less "offset" during the turning, being given an inclination which results from the relative forward and backward movement of the supporting means at the front of the vehicle which is unique.



   A vehicle may thus be provided with two extended support arms mounted upon steering pins - fixedly - arranged with respect to the vehicle's frame, the arrangement being such that movement in unison of each supporting arm in view to its pivot and the arrangement of each pivot being defined by an angled position in a rearward direction and simultaneously having said extended two pivot axis diverging in a downward direction, causing the   "pendulum'1    action whereby the points of intersection of each pivot axis with the supporting plane of the vehicle are situated in an outward direction with respect to the supporting means and away from the vehicle's longitudinal axis
Allthough a vehicle according to an improved embodiment could be achieved in its simplest construction as described before, yet additional means could be provided,

   thereby enabling the advantages of the   "pedulum"    action by the provision of at least one adjustable control means for the relevant position of the pivot pin with respect to its housing, said adjustable means being integral with the pivot housing, said means consisting of helically disposed guiding element on the pivot pin and cooperating elements on the housing causing the relative positioning of the pivot pin with respect to its housing to be lifted and/or lowered respectively while the pivot housing is rotated during the steering operation.

  A variation of this provision can be appreciated while providing said helical guiding elements with differentiated cooperating portions per each pivot for increased effectiveness of the "pendulum" action, by providing two reversely directed helical - surfaces are provided on the pivot pin and inside the pivot housing, separated by a neutral zone enabling the accelerated - operation of desired "pendulum". Moreover it may be clear  that as described in the foregoing,   mechnically    operated means can promote the aforesaid invented operation, also special control means could be provided for automatically adjusting the "pendulum" action by means of a signal, derived from the instantaneous position of the steering means.

  For someone skilled in the art it will be possible to understand the ways and means for carrying out the invention after having disclosed herein the various aspects of introducing the "pendulum" effect to the vehicle's operation.



  In view to the above it will become apparent that various mechanical or other devices may be combined with the constructional aspects in the application of the invention in order to improve the advantages. Moreover it will also be understood that the aforementioned signal could be easily derived from an accelerating and decellerating signalling device in combination with the signal initiated from the steering device. Especially when motorized tricycles are used, the specific speed characteristics of the vehicle become more important to be considered while providing for the desirable inclination of the pivot axis in relation to the pendulum action.

 

  It is also remarked hereby that the pendulum action could easily be realized for e.g. roller skates in which the length of supporting arms are not comparable with those for a tricycle, however the principle of the invention could still be applied.



  Allthough in the description some indication is given about the position and a preferred angle of the relevant pivot axis it must be clear that further experiments are still possible, thereby perhaps giving still better results provided that the pendulum action by inclined arrangement in relation to the length of a supporting arm is fully understood.  



  Other objects of the invention will appear in the   following      aescription    ana appended claims, reference being had to the accompanying drawings forming a part of this specification wherein like reference numerals designate corresponding parts in the several views.

  Several applications of the invention are illustrated by way of example in the drawings wherein:
Fig. 1 is a side eIevation of a tricycle showing the present invention;
Fig. 2 is a plan view showing the arrangement of the dirigible front steering construction of the tricycle shown in Fig. 1 having the steering mechanism located in front of the driver and this tricycle may carry two persons, the person sitting on the back seat resting with his legs at both sides of the driver;
Fig. 3 is a side elevation and Fig. 4 is a plan view of another tricycle for a single person wherein the steering mechanism according to the invention is located and operated respectively from under the driver's seat;

  ;
Figs. 5 up to and inclusive Fig. 10 are schematic views showing various positions of the wheels of a tricycle according to the invention and
Fig. 11 and Fig. 12 are a front and side view respectively of the connecting tubes for operating the steering construction.



  Before explaining the invention in detail it is to be understood that the detailed description is limited to the essential operating parts only, vehicle constructional parts not forming a part of the invention are not specifically described under the assumption that experts may easily understand a vehicle's construction.



  The car body 1 is in a known way connected to the main supporting frame 2 of the tricycle and this frame is supported on two front wheels 3 and one rear wheel 4. The steering mechanism consists of a pair of wheel supporting arms 5 which are rotatable around a steering pin 6 which is fixed with respect to the main frame 2. The supporting arm 5 for the wheel 3 is with its housing 7 rotatably fixed around the steering pin 6 and the housing is further provided with a protruding bracket 8 which has a pivot 9. A lever 10 is with its one end pivotally coupled with said pivot 9 and with its other end with one leg 11 of a V-shaped steering bracket 12 which is rotatably fixed upon the frame 2.

  The axis of rotation 13 of the V-shaped bracket can be operated directly by the driver e.g. through a transmission   mechanize    by means of a steering means 14 such construction being known per se so that it need not further be explained herein. Moreover, it will be clear that any other device, e.g. a shock absorbing device 15   maybe    incorporated in the wheel supporting arm 5 too.  



  The invention resides now in the particular location ana   poslxon    or   Lilt    ing pin 6 which forms the axis of rotation for the supporting arm 5 of the front wheel 3. This position is defined in such a way, that the pivot axis 16 is placed under an angle of   about 30    a with respect to a vertical plane and thereby also inclined in an outward and forward direction. The angled position of this rotational axis 16 with respect to the horizontal plane 17 is such, that the intersecting line 18 of both planes is situated just at the contacting line of the front wheels 2 or in a direction in front of these wheels.



   The extended sides 16 (pivot axis) of the triangle of which the line 18 is a basis line intersect the horizontal plane 17 at the points 19 and both points are clearly located at the outside of the wheels 2 as shown in Fig. 2.



     /on    or about
In Figs. 3 and 4 another embodiment of a tricycle is shown for the use of one person only. In this case, the steering means 20 are located under the seat of the driver. Here again a V-shaped bracket 21 is rotatably connected at 22 with the frame 2 of the vehicle and the ends of the legs 23 are pivotally coupled at 24 to levers 25 which are at their ends at 26 pivotally connected to the bracket 27 of the housing 28 which is connected to the wheel supporting
 arm 29 in a similar way as described above. Both levers 25 are crossing each other here, contrary to the position of the levers 10 of Figs. 1-2 lying in the same plane.



  The operation of the vehicle and its behaviour on the road both are entirely known as long as it moves in a straight line forward or backward, the wheels thereby following the arrowed lines in Figs. 1-4. However as soon as the driver turns the steering means, a pattern, different from what is understood as "normally turning" will be experienced. The operation, as a result of the particular position and inclination of the steering pins results into a kind of rocking movement of the vehicle, that is to say, while turning of the front wheels is effected, one longitudinal side of the frame of the vehicle is lifted whereas the opposite side is than lowered, the lowering side being the side of the vehicle in the direction of turning.

  By the choice of the triangle, described before and its position, which in fact defines the operation of the behaviour of the vehicle while making turns, it will be clear that the aimed advantage is obtained. The vehicle is allowed to behave in such a way that a natural position is induced; the driver automatically takes the desired inclined position which is the position in which the vehicle frame and body are moving while turning. This novel experience is called a momentary "pendulum" enabling the driver at the same time to maintain his "natural" comfortable position while making a turn. This "pendulum" action can only  satisfactorily be obtained if the precise invented position of the steering pins with respect to the frame of the vehicle are taken into account.



  Figs. 5-12, showing schematically certain various positions of a tricycle's basic frame only, will be explained hereafter.



  Figs. 5 and 6 are a front view and a side view respectively of a tricycle base which has the characteristic declined position of the steering pins and showing a road surface representing the "pendulum" action and position respectively. Figs. 7 and 8 show similar views as in the previous Figs. 5 and 6 but the inclination of the road surface is steeper. The front wheels 30 and 31 are rotatably mounted upon the wheel supporting arms 32 and 33, which are fixed in a way described before, the position/location of the pivot axis 34 and 35 respectively being each in a vertical plane and the angle of intersection with the horizontal plane 36 is shown in Fig. 6. The point of intersection of the pivot axis 34, 35 is indicated at 37.

  Contrary to the equidistant position of both pivot axis 34 and 35 in Fig. 5, the pivot axis 38 and 39 do intersect in plane 40 which contains both axis and which- plane, in an inclined position intersects the horizontal plane 41 at the points 42 and 43 respectively. Compared with the position of the intersecting pivot axis 16 in Fig. 2, 28 in Fig. 4 and 38, 39 in Figs. 7-8, the equidistant axis 34 and 35 of Figs. 5 and 6 take an extreme position as they intersect in the infinite and yet intersect the road surface at points which are positioned both at the outside of the wheels.



  Figs. 5-10 indicate the position of the wheels after they were turned   9 00,    a dotted line showing the wheels 44 in a theoretical position in which the road surface is shown under an angle indicated by the numeral 45. Figs.

 

  5-6 moreover indicate the difference in height position between the opposed wheels 44 shown with the numeral 46 and it follows from the drawing that the smaller the angle 46 is chosen, the greater the angle of inclination of the wheels 44 with respect to the road surface will be while progressively making a turn.

  Because of the relative position of the wheels on the road surface while steering through a curve, it will be clear that the mutual displacement of the plane of movement of the wheel changes from two equidistant surfaces which are perpendicular to the road surface, when the vehicle is moving straight forward, changes into two equidistant surfaces which no longer are perpendicular to the road surface, but instead both (wheel) surfaces tend to take progressively an inclined position with respect to the  
 road surface, thereby causing the natural comfortable "pendulum" positior
 of the driver in his vehicle. This again is shown in Figs. 7-8 wherein the
 preferred position of the pivot axis   38    and 39 results in a much   great ei   
 angle of inclination 47 in the theoretical angle of rotation of the wheels
 48.

  It means also that the more the points of intersection 42 and 43 become
 located away from the contact points between the wheels and the road surface
 the more the angle of rearward inclination decreases, that is to say, the
 more effective the "pendulum" action is experienced.



   Naturally it remains necessary that the wheels still perform their basic funct
 ion to roll over the road surface and that the "pendulum" action in the   9 0o   
 position in Fig. 8 indicates a difference in height at 49 but it will be clear
 that too heavy forces should preferably not be transmitted to the steering
 mechanism in case no auxiliary motor means are made available to the driver
 for automatically overcoming the influence of such relatively heavy steering
 forces.



   Figs. 9-10 'show another embodiment of a tricycle frame and the relative
 position of the wheels 50 - and their related pivot axis 51, 52 respectively.



   The planes of the wheels are slightly inclined with respect to the road surface,
 indicated by the angles 53 tending to decrease the possible differences
 between the angles of inclination of the wheels while steering the vehicle through a sharp curve. In Fig. 10 a difference in height between the points of contact of the wheels with the road surface is indicated at 54 and this is caused by the special configuration of the wheel   supporting    arm 55. This arm 55, not being situated in the plane which also contains the pivotal axis 51, 52 can turn around these pivotal axis 51 and 52 respectively, see Fig.



  9. This Fig. and Fig. 10 also indicate the two possible positions of the steering parts 56 and 57 respectively which are operable e.g. according to the concept already shown in Figs. 1-2 and Figs. 3-4 respectively. It may well be preferred to perform a tricycle according to the invention and have it driven by personal
 pedal power only although auxiliary power means (battery operated or fuel operated motor means) could easily be integrated. In Figs. 11-1 a detailed solution is schematically shown for use of the vehicle as a tricycle, simply   ty    connecting the wheel supporting arm 58 near the pivot axis 59 with a
Fixed extended bracket 60 and the parallelly disposed bracket 60 at the opposi :e side of the vehicle can than be coupled by means of the bar 61.

  This   zar    could be used by the driver for direct steering or if desired, the bar ;1 can be used for indirect steering, depending on the construction of the  
 vehicle.



   In view to the typical position of the wheels of the vehicle while steering
 through a curve, it will be highly desirable that provisions are made to keep
 the vehicle in an upright fixed position at a standstill thereby avoiding an
 instantaneous and unexpected   !'pendulum"    action. Such   a-pilovision    could
 than be obtained by locking the steering mechanism but it is also possible
 to balance the vehicle by means of normal brakes. As a result of the specific
 inclined position of the wheels when going into a curve, the steering operation
 may be influenced by the "pendulum" forces which require corresponding
 counter forces for compensation. These and other inherent measures to be
 considered are however of a controllable nature and if causing problems,
 can easily be taken.



   Insofar as the invention could also be adopted for all kinds of vehicles to
 be operated and steered in which the body of the vehicle automatically adopt
 a preferred inclination while going through curves, an automated control
 system for   compensating    forces while doing so, could be integrated to improve
 its easy operation.



   The invention can be basically applied to all vehicles which are moving upon
 a fixed road surface and which are normally subjected to such forces which
 intend to disturb the behaviour of the vehicle while moving through curves.



   In this   decription    reference is made to "wheels" as the means to use the
 embodiment of the invention but it should be understood that the "wheels" can be replaced by a couple of "floating   elements!1    located under the hull of a ships body - as well. As a matter of fact the invented steering aspect definitely causes a controllable displacement of the point of gravity of the vehicle by lowering it as soon as the   vehicle    is entering a curve, while reversing the action once the curve has been taken. It will be clear from the foregoing that the rear support of the vehicle preferably consists of one wheel or one floating means (boat). 

  However double wheels or equivalent sup porting element could be used without deviating from the general concept, provided that the stability of the vehicle is considered to be obtained by three contact points or contact surfaces.



  The relative displacement of the supporting elements under the vehicle while moving through a curve is of such a particular nature that as a result of the invented position and configuration of the supporting arms and on purpose, the regular pattern of a couple of such supporting elements, while movina  hrough a curve is disturbed for improved comfort ability of the users of he vehicle thereby giving them the sensation of balanced stability in a curve espite the increase of centrifugal forces which now tend to become compensaed by centripetal forces. - 

Claims

1. Vehicle for terrestrial use, equipped with three distantly arranged supporting means for forward movement, two of these supporting means being displaceable in unison by means of a common steering device, said two supporting means being each pivotally arranged on an extended supporting arm at the front part of the vehicle, the third supporting means being of a traditional nature of support only, each relevant extended pivot axis lying in a common plane which intersects the plane containing the said vehicle's supporting contact surfaces and the points of support, each extended pivot axis taking a rearward angle af inclination with respect to the vertical plane through the longitudinal axis of the vehicle,

the points of intersection of each pivot axis with the horizontal plane of support lying in an outward direction perpendicular to the vehicle's longitudinal axis and sidewardly and outwardly away of each of said points of contact, the arrangement being suchlike that while the vehicle traversing a curved path, the vehicle's frame is subjected to a "pendulum" action in the direction of turning, causing a relative different movement while progressively turning, the vehicle's supporting means located at the inner part of the curve moving more in a forward direction, whereas the supporting means located at the outer part of the curve being more retracted with respect to the said forward movement and vice versa. 2.

Vehicle according to claim 1, characterized, in that each extended pivot axis intersects the apposite pivot axis under a sharp angle at a point above the vehicle, the vertical line of projection from that point, intersecting with the said plane containing the vehicle's supporting contact surfaces and the point of support is located within the vertically projected area of circumference of the vehicle.

3. Vehicle according to claim 2, characterized, by the provision of two extended support arms mounted upon steering pins fixedly arranged with respect to the vehicle's frame, the arrangement being such that movement in unison of each supporting arm in view to its pivot - and the arrangement of each pivot being defined by an angled position in a rearward direction and simultaneously having said extended two pivot axis diverging in a downward direction, causing the "pendulum" action whereby the points of intersection of each pivot axis with the supporting plane of the vehicle are situated in an outward direction with respect to the supporting means and away from the vehicle's longitudinal axis.

4. Vehicle according to claim 3, characterized, in that the "pendulum" action is obtained by the provision of at least one adjustable control means for the relevant position of the pivot pin with respect to its housing, said adjusta ble means being integral with the pivot housing, said means consisting of helically disposed guiding element on the pivot pin and cooperating elements on the housing causing the relative positioning of the pivot pin with respect to its housing to be lifted and/or lowered respectively while the pivot housing is rotated during the steering operation.

5. Vehicle according to claim 4, characterized, in that said helical guiding elements are provided with differentiated cooperating portions per each pivot for increased effectiveness of the "pendulum" action in that two rever sely directed helical surfaces are provided on the pivot pin and inside the pivot housing, separated by a neutral zone enabling the accelerated operation of desired "pendulum".

6. Vehicle according to one of the foregoing claims, characterized in that control means are provided for automatically adjusting the "pendulum" action by- means of a signal, derived from the instantaneous position of the steering means.

7. Vehicle according to claim 6, characterized, in that said control means recei ve said signal in relation to the extent of acceleration and/or decelleration to which the vehicle is subjected.