초록 ▼

An extendible leg device for use in supporting a portion of a platform assembly above a floor surface. The extendible leg device has a leg tube that slidably receives a foot tube which is moved relative to the leg tube via selective rotation of an axle. The axle has a first link pivotally connected

An extendible leg device for use in supporting a portion of a platform assembly above a floor surface. The extendible leg device has a leg tube that slidably receives a foot tube which is moved relative to the leg tube via selective rotation of an axle. The axle has a first link pivotally connected to a first end of a second link which second link is further pivotally connected at its second end to the foot tube.

대표청구항 ▼

An extendible leg device for use in supporting a portion of a platform assembly above a floor surface. The extendible leg device has a leg tube that slidably receives a foot tube which is moved relative to the leg tube via selective rotation of an axle. The axle has a first link pivotally connected

An extendible leg device for use in supporting a portion of a platform assembly above a floor surface. The extendible leg device has a leg tube that slidably receives a foot tube which is moved relative to the leg tube via selective rotation of an axle. The axle has a first link pivotally connected to a first end of a second link which second link is further pivotally connected at its second end to the foot tube. ng said reader from receiving the reflected beam in a non-irradiation time of one scan period where the laser beam is off. 8. A barcode reader, comprising: a detector for detecting based on a driving state of a scan mirror start and stop timings for a laser beam irradiation within one scan period of the scan mirror; a generator for generating a laser beam irradiation on/off signal turned on/off within the one scan period based on the start/stop timings of the laser beam irradiation detected by the detector; and a driver for controlling the turning on/off of the laser beam in accordance with the laser beam irradiation on/off signal generated by the generator, whereby the actual scan span during which the laser beam is turned on within the one scan period is controlled in accordance with the laser beam irradiation on/off signal. 9. The barcode reader of claim 8, further comprising: a scan timer for measuring a present scan timing following the drive of the scan mirror during the one scan period, and wherein the detector compares a value measured by the scan timer and each of a preset start timing value and a preset stop timing value to determine the start and stop timings of the laser beam irradiation: within the one scan period. 10. The barcode reader of claim 9, further comprising: a timing signal generator for outputting a scan timing signal indicative of completion of one scan each time the scan mirror performs one complete scan; and a clearer for clearing the value measured by the scan timer each time the timing signal generator outputs the timing signal indicative of completion of one scan. 11. The barcode reader of claim 9, further comprising: a value getter for getting a maximum value of the scanning timing measured in one scan period by the scan timer, and wherein the detector detects preset start and stop timing values based on maximum measured value of the scanning timing. 12. The barcode reader of claim 9, wherein: the scan mirror is a vibration mirror; and the detector detects the right start and stop timings each time the scan direction is switched to the right by the scan mirror, and also detects the left start and stop timings each time the scan direction is switched to the left by the scan mirror to thereby control the scan spans in the respective right and left scan directions. 13. The barcode reader of claim 8, wherein: the detector detects a plurality of start and stop timings in one scan period and sets a plurality of scan spans in the corresponding one scan. 14. The barcode reader of claim 8, further comprising: a receiver for receiving the reflected beam in an irradiation time of one scan period where the laser beam is on and no reflected beam in a non-irradiation time of the one scan period where the laser beam is off. 15. A recording medium having a computer readable program code, the program code comprising: a computer readable program code for detecting based on a driving state of a scan mirror start and stop timings for a laser beam irradiation within one scan period of the scan mirror; a computer readable program code for generating a laser beam irradiation on/off signal turned on/off within the one scan period based on the start/stop timings of the laser beam irradiation; and a computer readable program code for controlling the turning on/off of the laser beam in accordance with the laser beam irradiation on/off signal, whereby the actual scan span during which the laser beam is turned on within the one scan period is controlled in accordance with the laser beam irradiation on/off signal.