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NTIS 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0542771 (1990-06-25) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 21 인용 특허 : 5 |
A ladder joint with an engagement spring member on it for locking/unlocking the ladder joint into position. The ladder joint has a fixed member and a movable member. The movable member has a circular portion with fixing slots on its outer circumference. The fixed member has an annular track which sl
In a ladder joint comprising the combination of: a fixed member having an adjustment slot, a rivet hole and an aperture; a release latch pivotally mounted to the rivet hole of the fixed member; and a movable member having a plurality of fixing slots position evenly around an outer periphery thereof,
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