1. A skateboard comprising a front plate and a rear plate which each have a wheel assembly, each wheel assembly comprises a wheel, a bracket and a rotary shaft, each wheel assembly being placed under the front plate and rear plates obliquely in relation to the plates, the front and rear plates being connected by a spring element, formed by an elongated torsional spring being secured at each end to a rod, the front plate (15) and the rear plate (16) each being provided with longitudinal holes, and each having bushings (9) for receiving the respective rods (1 and 2), said rods (1 and 2) being firmly secured (14) to the plates (15 and 16) and each of the wheel assemblies (10, 11, 12) being secured directly to each of the rods (1 and 2).
2. A skateboard according to claim 1, characterized in that the torsional spring (3) is a leaf spring.
3. A skateboard according to claim 1, characterized in that each wheel (11) is mounted in a bracket (10), which is mounted on an attachment element (12), which is mounted in its respective rod (1 and 2).
4. A skateboard according to claim 3, characterized in that the attachment element (12) is mounted inclined relative to the upper sides of the frost plate (15) and the rear plate (16).
5. A skateboard according to claim 1 further comprising a pipe, the spring element (3) being completely enclosed and the rods (1 and 2) being partly enclosed in the pipe (6).
6. A skateboard according to claim 3, characterized in that a shock absorber in the form of a spring (13) is mounted in the bracket (10)
7. A skateboard according to claim 5, characterized in that depressions or recesses (18) are provided on the lower sides of the plates (15 and 16) for receiving brake blocks andor support wheels.
8. A skateboard according to claim 2, characterized in that each wheel (11) is mounted in a bracket (10), which is mounted on an attachment element (12), which is mounted in its respective rod (1 and 2).
9. A skateboard according to claim 2, further comprising a pipe (6), the spring element (3) being completely enclosed and the rods (1 and 2) being partly enclosed in the pipe (6).
10. A skateboard according to claim 4, characterized in that a shock absorber in the form of a spring (13) is mounted in the bracket (10).
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A pressure display apparatus, comprising:
a detected signal processor configured to process a detected signal obtained from a pressure detection means for detecting a pressure;
a pressure value display device configured to display on a display a pressure value (detected pressure value) regarding said pressure at least based on the processed signal obtained from said detected signal processor; and
a reference point adjustment device configured to adjust the display for a given reference pressure value,
wherein said reference point adjustment device is configured to set the reference pressure value for a given magnitude, to obtain and set a detected pressure value corresponding to said reference pressure value and set a deviation value of the reference pressure value, and to correct at least the detected pressure value based on said deviation value, and
wherein the reference point adjustment device is configured to reset the set deviation value for zero.
2. The pressure display apparatus according to claim 1, reference point adjustment device is configured to store a set reference pressure value.
3. The pressure display apparatus according to claim 2, reference point adjustment device is configured to store multiple different reference pressure values.
4. The pressure display apparatus according to claim 1 further comprising:
a signal output device configured to output signals regarding the pressure value adjusted by said reference point adjustment device.
5. The pressure display apparatus according to claim 4, wherein the signal output device is configured to output digital signals in accordance with a switch being turned onoff.
6. The pressure display apparatus according to claim 1 further comprising;
a signal output device configured to output detected signals obtained from said pressure detector.
7. The pressure display apparatus according to claim 6, wherein said signal output device is configured to send digital signals in accordance with a switch being turned onoff.
8. The pressure display apparatus according to claim 1, further comprising:
a pressure gauge.
9. A pressure display apparatus, comprising:
a detected signal processor configured to process a detected signal obtained from a pressure detection means for detecting a pressure;
a pressure value display device configured to display on a display a pressure value (detected pressure value) regarding said pressure at least based on the processed signal obtained from said detected signal processor;
a reference point adjustment device configured to adjust the display for a given reference pressure value, wherein said reference point adjustment device is configured to set the reference pressure value for a given magnitude, to obtain and set a detected pressure value corresponding to said reference pressure value and set a deviation value of the reference pressure value, and to correct at least the detected pressure value based on said deviation value; and
an error handling device configured to set a limit value for evaluating a magnitude of said deviation value and execute an error procedure when said deviation value is not smaller than the limit value.
10. The pressure display apparatus according to claim 9, wherein the error handling device is configured to inhibit said correction function from making any correction.
11. The pressure display apparatus according to claim 9, wherein the error handling device is configured to indicate a predetermined abnormal situation.
12. A pressure display apparatus, comprising:
a detected signal processor configured to process a detected signal obtained from a pressure detection means for detecting a pressure;
a pressure value display device configured to display on a display a pressure value (detected pressure value) regarding said pressure at least based on the processed signal obtained from said detected signal processor;
a reference point adjustment device configured to adjust the display for a given reference pressure value, wherein said reference point adjustment device is configured to set the reference pressure value for a given magnitude, to obtain and set a detected pressure value corresponding to said reference pressure value and set a deviation value of the reference pressure value, and to correct at least the detected pressure value based on said deviation value; and
a pressure gauge connected to a series circuit of a direct current power source and a receiver in a two-line transfer system via a connection cable.