초록 ▼

An improved swiveling wheel assembly comprising a brake member including a toggle lever mechanism comprising a first and a second element rotatably connected together. The first element is rotatably fastened to the upper end of a rod-shaped locking member and the second element is rotatably connecte

An improved swiveling wheel assembly comprising a brake member including a toggle lever mechanism comprising a first and a second element rotatably connected together. The first element is rotatably fastened to the upper end of a rod-shaped locking member and the second element is rotatably connected to a vertical fastening member. A coupling means is also included and used for coupling one of the first and second elements to a cam member whereby, when the cam member rotates from a first or second position into a third position, the toggle lever mechanism is brought from an unextended position into essentially an extended position, wherein a line drawn between the axes of rotation of the toggle lever mechanism is essentially aligned with the longitudinal axis of the locking member and the locking member is displaced downward against a spring member with respect to the first and second positions whereby a lower edge of a locking disk is pressed against the wheel.

대표청구항 ▼

In a swiveling wheel assembly having a wheel which has a bearing surface and which is attachable to an object such as a leg of a hospital bed, including, a yoke having a generally horizontally running top plate and two lugs projecting downwardly between which said wheel is pivotably connected and a

In a swiveling wheel assembly having a wheel which has a bearing surface and which is attachable to an object such as a leg of a hospital bed, including, a yoke having a generally horizontally running top plate and two lugs projecting downwardly between which said wheel is pivotably connected and a tooth portion, said yoke having a locked swivel position, a vertical fastening member for attachment to said object, said top plate being connected to freely rotate about a vertical axis of rotation with said vertical fastening member, a generally rod shaped locking member which is guided to slide by said fastening member, a brake member including a locking disk having a recess therein, a cam follower, a cam member mounted for rotary movement about a shaft in said fastening member, said shaft mounted transverse to the vertical axis of rotation of said yoke, said cam member having a peripheral portion, said locking member having its lower end attached to said locking disk and its upper end connected to said cam follower, said cam follower cooperating with said cam member, a spring member for maintaining said locking member under upward spring tension thereby holding the cam follower in engagement with said cam member, said locking disk including a brake portion which portion is pressable against said bearing surface of said wheel, whereby when said cam member is turned the locking rod and its attached locking disk can be brought into three different positions with respect to the distance between said disk and the top plate of said yoke, and when in a first position the yoke is able to swing freely about its vertical axis of rotation, when in a second position the cam follower rests against a portion of the periphery of said cam member, the radial distance from the axis of rotation of said cam member is greater or smaller than that of the portion of the periphery of the cam member against which the cam follower rests when in said first position and wherein said yoke is locked in at least one swivel position when said recess of said locking disk engages said tooth portion of said yoke, and when in a third position the distance between said locking disk and the top plate of said yoke is at its greatest and said brake portion of said locking disk is pressed against said wheel, wherein the improvement comprises: said brake member includes a toggle lever mechanism comprising a first and a second element (23, 21) rotatably connected together wherein said first element (23) is rotatably fastened to the upper end of the rod-shaped locking member (7) and the second element (21) is rotatably connected to the vertical fastening member (6), and coupling means for coupling one of said first and second elements (23, 21) to the cam member (13) whereby, when the cam member (13) rotates from the first or second position into the third position, the toggle lever mechanism is brought from an unextended position into essentially an extended position, wherein a line drawn between the axes of rotation of the toggle lever mechanism is essentially aligned with the longitudinal axis of the locking member (7) and the locking member (7) is displaced downward against the spring member (10) with respect to the first and second positions whereby the lower edge of the locking disk (9) is pressed against the wheel (4).