The invention refers to a four-wheel cycle provided with four small armless wheels, driven by levers by the human driver, used in transportations.

Bicycles constructions are known, provided with a frame on which a handlebar, a saddle are mounted and on which the wheels' drive is provided by a driving engine. The actuating motor transmits by a chain wheel to another chain wheel, joint to the driving roll, which is unmediated outside, engaging by friction a wheel from the rear side of a two-wheel vehicle.

These constructions have the disadvantage of being driven only on one side, considerably reducing the energy and the slippage phenomenon may occur between the driving roll and the rear wheel. The technical issue solved by the invention is to design a four-wheel cycle provided with small, armless wheels and single driving.

The four-wheel cycle, according to the invention, solves the above issue by the fact that it is made of four small wheels with two levers in between, on a frame, on which a saddle, a fixed directional pipe, a mobile steering and a handlebar; on the same frame mentioned above, two front spans and two rear spans are mounted, on which three arms are disposed, ensuring the free mounting of wheels and the driving is provided by a driving gear, in contact with two mobile arms, fixed on the lever and on a clutch disk, fixed on the frame.

The invention presents the following advantages:

- compact and solid construction;

- increased safety in exploitation by the elimination of the wheel arms;

- the decrease of the advancement resistance due to the construction of the frame and forks; an ergonomic position in pedaling.

An example of the invention realization is hereinafter given, related also to fig. 1-10, representing:

fig. 1, perspective view of the four-wheel cycle;

- ^' fig. 2, lateral and up view of the frame;

fig. 3, lateral and perspective view of the wheels, support arms and rim's profile;

fig. 4, front and perspective view of the four-wheel cycle steering;

- fig. 5, perspective and front view of the gear driving levers;

- fig. 6, perspective and front view of the driving gear on the rear wheels;

- fig. 7, front view of the driving clutch disk on the rear wheels;

- fig. 8, perspective and front view of the braking system;

- fig. 9, perspective and lateral view of the handlebar and flapping steering pipe;

- fig. 10, perspective and lateral view of the saddle and flapping pipe.

According to the invention, the four-wheel cycle is built from a frame 1. Two profiles 14, 15 are mounted on it. The Kelly 54, 60 is mounted for fixing the levers 53, 59. On the front side of the frame 1 a pipe is mounted, having the role of free guiding of the front wheels 150, 151. On this pipe 2 a steering pipe 3 is mounted. From it two pipes 5, 4 are mounted, each having at its end a pipe 6, 7 in which the guiding for both front wheels 150, 151 will be mounted. The frame 1 is provided with a rod 16, for guiding the levers 53, 59. On the rear part of the frame 1, a pipe 8 is mounted, with the role of a spacer. On this pipe 8, each side has two pipes 17, 18 mounted, supporting the driving disks of the clutch disks 87, 91. At the end of the pipe 8, a saddle support pipe 94s mounted. From it, two pipe 10^ 11 are mounted, having at each end a pipe 12, 13, on which the rear wheels 152, 153 will be mounted. The wheels 150, 151, 152, 153 are similar as construction, being composed of a rubber 24, mounted on the rim 23. For these to run, three arms 21, 22, 23 are mounted in equal pipe and, at their end, they are curved in an angle. The mounting on the rim 23 is made by welding, the pipes' joining being provided by a loop 19 for fixing the arms 21, 22, 23 to the center of the wheels.

The guiding on the front wheels 150, 151, is made by three rods 30, 40, 45. On the left side, the wheel 150 is fixed with a threaded axle 26, through the center of the loop 19, being blocked by a nut 27. On the rod 30, a profile 28 is mounted, in which a bearing 29 is introduced by pressing. The threaded axle 26 enters by the bearing 29, being blocked at the end with a nut 27a. The rod 30 is mounted in a pipe 7, at the base with a bearing 31 and, at its end, with another bearing 32. On the right side, the wheel 151 is fixed with an axle 35, threaded through the center of the loop 19, being blocked from it by a nut 36. On the rod 40, a profile 37 is mounted, in which a bearing 38 is introduced by pressing. The threaded axle 35 enters through the bearing 38, being blocked at its end with a nut 36a. The rod 40 is mounted in pipe 6, at the base with a bearing 41 and, at its end, with another bearing 42. In the upper side on the pipe 40, a clutch 43 disk 39 is mounted, being blocked with a nut 44. For moving the wheels 150, 151, to the left or to the right, on the pipe 141 on which is mounted the handlebar 148, a rod 45 is mounted in the central pipe 3, in which a bearing 46 is introduced, at its end being mounted another bearing 47. On the upper side on the pipe 45 two clutch 48, 49 disks 39 are mounted, being blocked with a nut 50. In order to actuate the two wheels 150, 151, on the left side, on the clutch disk 33 and on the clutch disk 48, a chain 51 is mounted. On the right side, on the clutch disk 43 and on the clutch disk 49, a chain 52 is mounted.

The actuation of the rear wheels is made by the levers 53, 59. On the left side, the mounting of the lever 53 with profile 15 is made by an axle 54 at the threaded ends, where a nut 56 is mounted, a bearing 55 is introduced by a lever 53. In the profile 15 a bearing 57 is pressed. The double- threaded axle 54 enters into the bearing and is blocked with a nut 58. On the right side, the mounting of the lever 59 with profile 14 is made by an axle 60 at the threaded ends, where a nut 62 is mounted, a bearing 61 is introduced by the lever 59. In the profile 14, a bearing 63 is pressed. The double- threaded axle 60 enters into the bearing and is blocked with a nut 64. The lever 53 is driven by an oscillatory movement from up to down a, b, by a steel cable 65. The steel cable 65 is fixed to the lever 53 by two profiles 68, being tightened with two screws 69 and two nuts 70. The lever 59 is driven by an oscillatory movement from down to up b, a, by a steel cable 65. The steel cable 65 is fixed to the lever 59 by two profiles 71, being tightened with two screws 72 and two nuts 73. For the oscillatory movement of the levers 53, 59, with a steel cable 65, on the frame 1 an arm 16 is mounted, on which can be found the roll 74 with internal profile. This roll 74 is mounted in arm 16 with a screw 75 and a nut 76. At the end of the levers 53, 59, an arm 77, 79 is mounted with a threaded axle 78, 80.

The actuation of the wheels 152, 153 from the rear side is made by the oscillatory movement of the levers 53, 59. On each side, two big clutch disks 87, 91 and . two small clutch -disks-1-03, 118jire mounted. On the left side. ; thedufc disk; 87 is mounted on the support 17 by an threaded axle 92, blocking the clutch disk 87 with a nut 93. At the ends of the support 17 two bearings 94, 95 are mounted, being blocked with nut 96. On the right side, the clutch disk 91 is mounted on the support 18 with a threaded axle 97, blocking the clutch disk 91 with a nut 98. At the ends of the support 18 two bearings 99, 100 are mounted, being blocked by a nut 101. In order to perform the semi-rotation movement on the clutch disk 87, a threaded axle 84 is mounted. The axle 84 is blocked by a clutch disk 87 with a nut 85. The mobile arm 81 has bearings 83 at its ends. A head of the arm is mounted on the axle 84 of the clutch disk 87, being blocked with a nut 86 and, at the other end, the axle 78 of the lever 53 is mounted. In order to perform the semi- rotation movement on the clutch disk 91, a threaded axle 88 is mounted. The axle 88 is blocked by a clutch disk 91 with a nut 89. The mobile arm 82 has, at its end, bearings 83. An arm head is mounted on the axle 88 of the clutch disk 91, being blocked with a nut 90 and the axle 80 of the lever 59 is mounted at the other end. The oscillatory movement between the big clutch disks 87, 91 and the clutch disks 103, 118 is made by a chain 137.

The mounting of the rear wheel 152 is made on the right side with a threaded axle 106 by a loop 19, fixing and blocking the axle with a nut 107. On the axle 106, a coupling device 108 is mounted, provided with a thread, on which the clutch disk 103 is mounted for actuation. On the axle 106 a collar 109 and a spacer 110 are added. In the pipe 12 a rod 111 is mounted, with a base profile in which a bearing 113 is pressed. The axle 106 enters into the rod 111 and is blocked with a nut 114. The mounting of the rear wheel 153 is made on the left side with a threaded axle 115 through the loop 19, fixing and blocking the axle with a nut 116. On the axle 115 a coupling device 117, provided with a thread, is mounted; the clutch driving disk 118 is mounted on it. On the axle 115 a collar 119 and a spacer 120 are added. In the pipe 13, a rod 121 is mounted, with a base profile, in which a bearing 123 is pressed. The axle 115 enters into the rod 121 and is blocked with a nut 124. The braking system is made by the disk 125, 127. On the right side, the braking disk 125 is mounted on the gearing device 108 by four screws 126. On the rod 111 a fixation and adjustment part 129 is mounted for the braking device 131. The latter is fixed by two screws 130. On the braking device 131, the braking cable 131 is mounted, which is driven by a crank 155, fixed to the handlebar 148. On the left side, the braking disk 127 is mounted on the gearing device 127 by four screws 128. On the rod 121 a fixation and adjustment part 133 is mounted for the braking device 135. The latter is fixed by two screws 134. On the braking device 135, a braking cable 136 is mounted, driven by a crank 154, fixed on the handlebar 148. For the space efficiency, the steering pipe 141 may be flapped, pulling the valve 138, having an axle 139 and a spring 142. For the steering folding, a hinge 140 is mounted. During the travel, if the saddle 149 is not wished, it may be flapped from two sides. Pulling the valve 143, having an axle 144 and a spring 147. For the folding of the pipe 146 for the saddle 149, two hinges 145 are mounted.

All the accessories may be mounted on this model, i.e. light, dynamo, cat eye, baggage rack, splashers. Also, an electric or internal combustion engine may be mounted on it.