초록 ▼

A foldable stroller includes a positioning member disposed fixedly on one inclined lower rod of a front wheel unit, and a guideway member disposed fixedly on one inclined upper rod of a handle unit. A resilient element biases an abutment surface of a sliding element to engage a positioning surface o

A foldable stroller includes a positioning member disposed fixedly on one inclined lower rod of a front wheel unit, and a guideway member disposed fixedly on one inclined upper rod of a handle unit. A resilient element biases an abutment surface of a sliding element to engage a positioning surface of the positioning member, thereby locking the handle unit releaseably on the front wheel unit. The abutment surface and the positioning surface are inclined with respect to the longitudinal directions of the upper and lower rods. Actuation of a connecting element results in separation of the abutment surface from the positioning surface, thereby permitting folding of the handle unit on the front wheel unit.

대표청구항 ▼

A foldable stroller includes a positioning member disposed fixedly on one inclined lower rod of a front wheel unit, and a guideway member disposed fixedly on one inclined upper rod of a handle unit. A resilient element biases an abutment surface of a sliding element to engage a positioning surface o

A foldable stroller includes a positioning member disposed fixedly on one inclined lower rod of a front wheel unit, and a guideway member disposed fixedly on one inclined upper rod of a handle unit. A resilient element biases an abutment surface of a sliding element to engage a positioning surface of the positioning member, thereby locking the handle unit releaseably on the front wheel unit. The abutment surface and the positioning surface are inclined with respect to the longitudinal directions of the upper and lower rods. Actuation of a connecting element results in separation of the abutment surface from the positioning surface, thereby permitting folding of the handle unit on the front wheel unit. -VL|max,and that said development potential varies in a range satisfying relations: |VB-VL|≤|VB-VL|max+50V (1) |VB-VL|≥|VB-VL|max-50V (2) |VB-VL|max≤300V (3) then image density varies by a width of 10% of image density corresponding to the maximum set value of the development potential or less. 21. The apparatus as claimed in claim 20, wherein the bias VB,the potential VLand a potential VDof an unexposed portion of said image carrier satisfy a relation: 0D|-|VB|D-VL|<250 V (4) and assuming that a minimum amount X of toner deposition implementing saturation image density on said image carrier is expressed as: X=0.6×toner grain siz