IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0406244
(1982-08-03)
|
우선권정보 |
AU-0007104 (1981-01-02) |
국제출원번호 |
PCT/AU81/00193
(1981-12-23)
|
§371/§102 date |
19820803
(19820803)
|
국제공개번호 |
WO-8202416
(1982-07-22)
|
발명자
/ 주소 |
- Hodson Baden L. (Enoggera AUX)
|
출원인 / 주소 |
- Milba Properties Pty. Ltd. (Enoggera AUX 03)
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
0 |
초록
▼
A levelling device for ladders has a pair of locking bars (24, 32, 51, 52) pivotally mounted on the ladder (28, 31, 42). A support arc (16, 33, 48), having feet (19, 34) at each end, passes through apertures (50) in the locking bars (24, 33, 51, 52). Springs (25, 46) interconnecting each locking bar
A levelling device for ladders has a pair of locking bars (24, 32, 51, 52) pivotally mounted on the ladder (28, 31, 42). A support arc (16, 33, 48), having feet (19, 34) at each end, passes through apertures (50) in the locking bars (24, 33, 51, 52). Springs (25, 46) interconnecting each locking bar (24, 32, 51, 52) and the ladder (28, 31, 42) urge the locking bars (24, 32, 51, 52) to an unlocked position where the support arc (16, 33, 48) is free to pass through the apertures (50). When weight is applied to the ladder (28, 31, 42), the locking bars (24, 32, 51, 52) are urged to a locked position, against the springs (25, 46), where the sides of the apertures (50) engage the support arc (16, 33, 48) to lock it against further movement. By adjustment of the support arc (16, 33, 48), the feet (19, 34) may be raised or lowered to accommodate any irregularities in the support surface so that the ladder (28, 31, 42) will stand vertically. The levelling device may also be applied to tables, chairs, trestles (42) or like articles.
대표청구항
▼
A levelling device for ladders comprising an arcuate support member having opposite ends adapted to engage a support surface, means attached to the lower portion of a ladder and adapting the ladder and arcuate support member for arcuate movement along the longitudinal axis of the arcuate support mem
A levelling device for ladders comprising an arcuate support member having opposite ends adapted to engage a support surface, means attached to the lower portion of a ladder and adapting the ladder and arcuate support member for arcuate movement along the longitudinal axis of the arcuate support member, a pair of apertured locking members pivotally mounted on said means and receiving through the apertures thereof the arcuate support member, springs interconnecting said means and apertured locking members and biasing the latter on their pivot axes in a direction whereby the apertured locking members are released for relative movement along the axis of the arcuate support member, the placement of weight on said ladder overcoming the biasing force of said springs and moving the apertured locking members on their pivots to positions of positive locking with the arcuate support member, and adjustable stop means connected with the apertured locking members and preventing pivotal movement of the latter by said springs beyond the required released positions of the apertured locking members.
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