A self-leveling support includes a first stile (1) and a second stile (2), a first leg member (6) and a second leg member (7), each having an elongate element adapted to move longitudinally relative to one of the stiles (1, 2), a spacer (3) adapted to secure the stiles (1, 2) substantially parallel
A self-leveling support includes a first stile (1) and a second stile (2), a first leg member (6) and a second leg member (7), each having an elongate element adapted to move longitudinally relative to one of the stiles (1, 2), a spacer (3) adapted to secure the stiles (1, 2) substantially parallel to each other, and a cross member (8) adapted to pivot about a pivot pin (9) acting in a guide (10) in the spacer (3) substantially midway between the stiles (1, 2), the cross member being connected at each end to a respective portion of the leg members, angular movement of the cross member about or with the pivot pin causing one leg member to move outwards relative to its respective stile while the other leg member moves inwards relative to its respective stile.
대표청구항▼
1. A self-leveling support comprising:a first stile and a second stile; a first leg member and a second leg member, each comprising an elongate element adapted to move longitudinally relative to one of the stiles; a spacer means adapted to secure the stiles in a fixed relation to each other; and a c
1. A self-leveling support comprising:a first stile and a second stile; a first leg member and a second leg member, each comprising an elongate element adapted to move longitudinally relative to one of the stiles; a spacer means adapted to secure the stiles in a fixed relation to each other; and a cross member comprising an elongate beam connected to the spacer means substantially midway between the stiles by a pivot pin about which the cross member is adapted to pivot, the beam having two ends, each end being directly connected to a respective portion of the leg members, such that angular movement of the cross member about the pivot pin causes one leg member to move outwards relative to its respective stile whilst the other leg member moves inwards relative to its respective stile. 2. The self-leveling support according to claim 1, further comprising a first locking element on the spacer and a second locking element on the cross member, wherein the first and second locking elements are moveable relative to each other in a direction parallel to the stiles whereby the first and second locking members are automatically engaged to lock the cross member against rotation relative to the spacer when a vertically downward load is applied to the cross member.3. A self-leveling support comprising:a first stile and a second stile; a first leg member and a second leg member, each comprising an elongate element adapted to move longitudinally relative to one of the stiles; a spacer means adapted to secure the stiles in a fixed relation to each other; and a cross member connected to the spacer means substantially midway between the stiles by a pivot pin about which the cross member is adapted to pivot, the cross member being connected at each end to a respective portion of the leg members, such that angular movement of the cross member about the pivot pin causes one leg member to move outwards relative to its respective stile whilst the other leg member moves inwards relative to its respective stile, wherein an aperture is provided in each stile to allow connection of each end of the cross-member to a leg member. 4. The self-leveling support according to claim 3 in which the apertures each comprise an elongated slot.5. The self-leveling support according to claim 3, in which one or more of the leg members is received within a foot portion or pad which engages the ground.6. The self-leveling support according to claim 3, in which the spacer means comprises a rung connecting the two stiles.7. The self-leveling support according to claim 3, in which the guide in which the pivot pin is adapted to rotate comprises an elongate vertical slot.8. The self-leveling support according to claim 7 in which the pivot pin is adapted to move up and down along the slot as well as rotate.9. The self-leveling support according to claim 3, in which the pivot pin comprises a solid tubular rod which extends orthogonally through the cross-member.10. The self-leveling support according to claim 3, in which a fixing means is provided on the cross-member and the spacer means to retain the cross-member in a predetermined angular position relative to the stiles when the predetermined angular position is obtained.11. The self-leveling support according to claim 10 in which the fixing means comprises a toothed crescent portion provided on a face of the cross-member which is adapted to mesh with one or more protrusions or teeth provided on the spacer means, when the pivot pin is at an upper end of the slot or slots in the spacer means.12. The self-leveling support according to claim 11 in which the protrusions on the spacer means comprise a crescent of concave form of teeth complementary to the crescent of teeth on the cross-member.13. The self-leveling support according to claim 3, in which each stile comprises a hollow elongate member and the elongate element of each leg member is accommodated within the hollow elongate member of each respective stile and adapted to slide relative to the stile.14. A self-leveling support comprising:a first leg member and a second leg member, each comprising an elongate element adapted to move in a longitudinal direction relative to a frame or ladder, the first leg and second leg being separated by a fixed spacing relative to each other in a direction substantially orthogonal to the longitudinal direction; a cross member slidably and pivotally attached to each of the first and second leg members, the cross member further adapted to pivot substantially midway between the first and second legs, such that angular movement of the cross member about a pivot point causes one leg member to move outwards relative to its respective portion of the frame or ladder whilst the other leg member moves inwards relative to its respective portion of the frame or ladder; and a fixing means having a toothed crescent portion provided on the cross-member to retain the cross-member in a predetermined angular position relative to the legs when the predetermined angular position is obtained and meshed with one or more protrusions or teeth provided on a corresponding toothed crescent portion fixedly provided on the frame or ladder. 15. The self-leveling support according to claim 14 in which the one or more protrusions comprise a crescent of concave form of teeth complementary to the crescent of teeth on the cross-member.16. The self-leveling support according to claim 14 wherein slidable and pivotal connections between the frame or ladder and the legs are provided by pins in oval-shaped slots.17. The self-leveling support according to claim 14 wherein slidable and pivotal connections between the frame or ladder and the cross member are provided by a pin in an oval-shaped slot.18. A self-leveling support comprising:a first stile and a second stile; a first leg slidably mounted to the first stile for movement longitudinally of the first stile; a second leg slidably mounted to the second stile for movement longitudinally of the second stile; a spacer secured the stiles to maintain the stiles in a fixed relation to each other; a cross member comprising an elongate beam pivotally connected to the spacer substantially midway between the stiles, the beam being connected at each end directly to a respective portion of a respective leg whereby angular movement of the cross member about the pivot causes one leg to move outwards relative to its respective stile whilst the other leg member moves inwards relative to its respective stile; and means for locking the position of the legs relative to their respective stiles; wherein the locking means comprises a first locking element on the spacer and a second locking element on the cross member, the first and second locking elements being disengageable from each other to permit pivotal movement of the cross member relative to the spacer and being engageable with each other to lock the cross member against rotation relative to the spacer and thereby lock the legs against longitudinal movement relative to the stiles. 19. The self-leveling support according to claim 18, in which each stile comprises a hollow elongate member and each leg comprises and elongate member accommodated within the respective stile and adapted to slide relative to the stile.20. The self-leveling support according to claim 18, in which an aperture is provided in each stile to allow connection of each end of the cross member to a respective leg.21. The self-leveling support according to claim 18, in which one or more of the legs is received within a foot portion or pad which engages the ground.22. The self-leveling support according to claim 18, in which the pivotal connection between the cross member and the spacer is provided by a pivot pin which is secured to the cross member and acts in an elongate vertical slot in the spacer.23. The self-leveling support according to claim 22, in which the pivot pin comprises a solid tubular rod which extends orthogonally through the cross member.24. The self-leveling support according to claim 18, in which the second locking element comprises a toothed crescent portion provided on an upper face or lower face of the cross member and the first locking element comprises one or more protrusions or teeth provided on the spacer means.25. The self-leveling support according to claim 24, in which the protrusions on the spacer means comprise a crescent of concave form of teeth complementary to the crescent of teeth on the cross member.26. The self-leveling support according to claim 18, wherein the stiles are the stiles of a ladder.27. The self-leveling support according to claim 18, wherein the first and second locking elements are movable relative to each other in a direction parallel to the stiles whereby the first and second locking members are automatically engaged when a vertically downward load is applied to the cross member.
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이 특허에 인용된 특허 (1)
Coutts Ian B. (20 Kildare St. Burwood ; Victoria AUX 3125), Ladders leveling device.
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