A lockable hinge includes a first and second hinge member, a lock, and an actuator. The lockable hinge is coupled to a pair of ladder-leg sections and is arranged to allow the ladder-leg sections to move among closed, trestle-ladder, and straight-ladder positions. The lock is used to lock the hinge
A lockable hinge includes a first and second hinge member, a lock, and an actuator. The lockable hinge is coupled to a pair of ladder-leg sections and is arranged to allow the ladder-leg sections to move among closed, trestle-ladder, and straight-ladder positions. The lock is used to lock the hinge members to cause the ladder-leg sections to lock in the closed, trestle-ladder and straight-ladder positions.
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The invention claimed is: 1. A lockable hinge comprising first and second hinge members coupled together for rotation about a common axis, a lock coupled to the second hinge member, the first hinge member being formed to include a lock-receiving space, a knob having a connector post coupled to the
The invention claimed is: 1. A lockable hinge comprising first and second hinge members coupled together for rotation about a common axis, a lock coupled to the second hinge member, the first hinge member being formed to include a lock-receiving space, a knob having a connector post coupled to the lock and arranged for movement in a first direction about the common axis wherein the lock is arranged for radial movement away from the common axis and wherein a portion of the lock is received in the lock-receiving space to block movement of the first and second hinge members relative to one another about the common axis, and wherein the knob is further arranged for movement in a second direction about the common axis wherein the lock is arranged for radial movement toward the common axis and wherein the lock portion withdraws from the lock-receiving space to allow movement of the first and second hinge members relative to one another about the common axis, wherein the lock includes a mounting plate coupled to the knob for rotation therewith about the common axis, and a cam having the tab coupled to the mounting plate wherein, when the knob is rotated in the first direction, the cam moves radially outwardly relative to the common axis to cause the tab to enter the lock-receiving space to lock the hinge members, and wherein, when the knob is rotated in the second direction, the cam moves radially inwardly relative to the common axis to cause the tab to withdraw from the lock-receiving space to unlock the hinge members, and wherein the mounting plate is formed to include a pair of mounting apertures and a central axis bore coupled to a pair of generally L-shaped cams formed to include an annular aperture and an oblong aperture, a pair of links formed to include a distal aperture and a proximal aperture, and a helical spring. 2. The hinge of claim 1, wherein the lock includes an outwardly-extending tab and the first hinge member includes a tab-receiving space arranged wherein the tab enters the tab-receiving space to lock the hinge members and the tab is withdrawn from the tab-receiving space to unlock the hinge members in response to the rotation of the knob. 3. The hinge of claim 2, wherein the tab and the tab-receiving space extend radially relative to the common axis. 4. The hinge of claim 1, wherein the knob is formed to include a pair of connector posts coupled to the mounting plate through the oblong cam apertures and the proximal link apertures. 5. The hinge of claim 4, wherein the second hinge member includes an axis shaft arranged to rotate about the common axis and extending through a central bore formed in the mounting plate and an inner housing of the first hinge member and the axis shaft is arranged coaxially through the helical spring to bias the mounting plate to cause each cam to extend radially outwardly against the annular flange portion of the inner housing upon movement of the knob in the first direction. 6. The hinge of claim 2, wherein the first hinge member includes a cylindrical inner housing having an annular flange portion and the tab-receiving space is formed in the annular flange portion. 7. The hinge of claim 6, wherein the annular flange portion of the inner housing of the first hinge member is formed to include a plurality of tab-receiving spaces corresponding to a closed position, a trestle-ladder position, and a straight-ladder position of the hinge members. 8. The hinge of claim 6, wherein the lock is arranged to be received in the inner housing of the first hinge member. 9. The hinge of claim 6, wherein the first hinge member includes a cylindrical outer housing arranged to nest around the cylindrical inner housing and the two housings are arranged to lie in concentric relation to the common axis. 10. The hinge of claim 9, wherein the inner and outer housings are arranged for rotative movement relative to one another about the common axis. 11. A lockable hinge comprising first and second hinge members coupled together for rotation about a common axis, a cam having a tab coupled to the second hinge member, the first hinge member having a tab-receiving space, an actuator, means for coupling the actuator to the cam so that, when the actuator is moved in a first direction, the cam moves radially outwardly relative to the common axis to cause the tab to enter the tab-receiving space to lock the hinge members, and so that, when the actuator is moved in a second direction, the cam moves radially inwardly relative to the common axis to cause the tab to withdraw from the tab-receiving space to unlock the hinge members, and wherein the means for coupling the actuator to the cam further includes a link having one end pivotably coupled to the mounting plate and a second end pivotably coupled to the cam. 12. The hinge of claim 11, wherein the means for coupling the actuator to the cam includes a knob having a pair of connector posts and a mounting plate, the connector posts are coupled to the mounting plate therewith for rotation about the common axis, and the cam is coupled to the mounting plate and arranged for movement of the knob in the first direction wherein the cam moves radially outwardly relative to the common axis to cause the tab to enter the tab-receiving space to lock the hinge members, and further arranged for movement of the knob in a second direction wherein the cam moves radially inwardly relative to the common axis to cause the tab to withdraw from the tab-receiving space to unlock the hinge members. 13. The hinge of claim 11, wherein the means for coupling the actuator to the cam further includes two cams and two links. 14. The hinge of claim 11 wherein the means for coupling the actuator to the cam includes a knob having a connector post and a mounting plate, the connector post is coupled through the cam to the mounting plate to rotate in a first direction about the common axis, the tab being arranged for radial movement away from the common axis into the tab-receiving space to block the second hinge member from pivoting relative to the first hinge member, and to rotate in a second direction about the common axis wherein the tab is arranged for radial movement toward the common axis to withdraw the tab from the tab-receiving space to allow the second hinge member to pivot relative to the first hinge member. 15. The hinge of claim 14, wherein the first hinge member includes a cylindrical outer housing and a cylindrical inner housing having an annular flange portion formed to include the tab-receiving space, the inner housing is arranged to nest within the outer housing, and the two housings are arranged to lie in concentric relation to the common axis. 16. The hinge of claim 15, wherein the annular flange portion of the inner housing is formed to include a plurality of tab-receiving spaces to lock the hinge members among a closed position, a trestle-ladder position, and a straight-ladder position. 17. The hinge of claim 15, wherein the inner and outer housings are arranged to rotate about the common axis. 18. The hinge of claim 14, wherein the knob, connector post, cam, tab, mounting plate, and tab-receiving space cooperate to comprise a lock. 19. The hinge of claim 18, wherein the lock is arranged to nest within the cylindrical inner housing of the first hinge member.
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이 특허에 인용된 특허 (15)
Fourrey Francois (Nogent Sur Vernisson FRX) Rager Sylvain (Nogent Sur Vernisson FRX), Articulation having a memory of an adjustment position for a seat structure.
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