Provided is a rolling guide device which is capable of preventing uneven wear of a holding belt by alleviating a tensile force that acts on the holding belt when the holding belt circulates in an endless circulation path together with rolling elements. The endless circulation path has a guide groove configured to guide movement of the holding belt in the endless circulation path. A condition of t.sub.max< is satisfied, where: t.sub.max represents a maximum clearance between both end portions of the holding belt which are opposed to each other in the endless circulation path; is expressed by $=2{}_0^{\frac{}{2}}\sqrt{{\left(a\sin \right)}^2+{\left(c\cos \right)}^2}d$

A ball retainer includes a chain belt, a hook, and a slot portion. The hook is arranged on the first end of the chain belt. The hook includes a neck portion, a hook body, two leaning protrusions, and a limiting protrusion. The hook body is connected to the neck portion. The two leaning protrusions extend outward along the short side direction of the chain belt toward two sides of the hook body, respectively. The slot portion is arranged on the second end of the chain belt. The slot portion includes a slot, two abutting portions, a connecting portion, and a receiving portion. After the hook is correspondingly engaged with the slot portion, the hook body is accommodated in the slot, the two leaning protrusions correspondingly lean against the two abutting portions, the neck portion leans against the connecting portion, and the limiting protrusion is correspondingly accommodated in the receiving portion.

A ball retainer is provided. The ball retainer includes a chain belt, a hook portion, and a recess portion. The chain belt has a first end and a second end. The hook portion is disposed at the first end. The recess portion is disposed at the second end. An outer circumferential side and an inner circumferential side are formed after the hook portion of the ball retainer is snapped into the recess portion. During operation of the ball retainer after the hook portion is snapped into the recess portion, an acting force is applied to the chain belt so that the hook portion is disengaged from the recess portion. During operation of the ball retainer after the acting force disappears, the first end and the second end of the chain belt approach each other so that the hook portion is accordingly snapped into the recess portion.

Provided is a rolling guide device which is capable of preventing uneven wear of a holding belt by alleviating a tensile force that acts on the holding belt when the holding belt circulates in an endless circulation path together with rolling elements. The endless circulation path has a guide groove configured to guide movement of the holding belt in the endless circulation path. A condition of t.sub.max< is satisfied, where: t.sub.max represents a maximum clearance between both end portions of the holding belt which are opposed to each other in the endless circulation path; is expressed by

[00001]$=2.Math.{}_0^{\frac{}{2}}.Math.\sqrt{{\left(a.Math..Math.\sin .Math..Math.\right)}^2+{\left(c.Math..Math.\cos .Math..Math.\right)}^2}.Math.d.Math..Math.-2.Math.{}_0^{\frac{}{2}}.Math.\sqrt{{\left(c.Math..Math.\sin .Math..Math.\right)}^2+{\left(b.Math..Math.\cos .Math..Math.\right)}^2}.Math.d.Math..Math.;$

2c represents an interval between the holding belt in a load path and the holding belt i

Provided is a motion guide device, which alleviates a tensile force acting on a holding belt when the holding belt circulates in an endless circulation path together with rolling elements, thereby being capable of preventing uneven wear of the holding belt. The motion guide device, includes: a track rail; a large number of rolling elements configured to roll on the track rail; a moving block, which has an endless circulation path for the rolling elements, and is configured to freely move along the track rail; and a holding belt having pockets, which are arrayed at predetermined intervals, and are configured to receive the rolling elements, is incorporated into the endless circulation path, and is configured to move in the endless circulation path together with the rolling elements, wherein the holding belt has a pair of end portions opposed to each other through intermediation of a free rolling element in the endless circulation path, and wherein a condition of (XY)Z>(B+C)A>0 is satisfied, where: A represents a path length of the endless circulation path; B represents a total length of the holding belt; C represents a diameter of the free rolling element; X represents a diameter of each of the pockets; Y represents a diameter of each of the rolling elements; and Z represents the number of the rolling elements arrayed in the holding belt.

A rolling bearing strip for a power operated rotary knife providing bearing support for rotation of a rotary knife blade with respect to a blade housing. The rolling bearing strip includes: a plurality of rolling bearings disposed in spaced apart relation; and a flexible separator cage for positioning the plurality of spaced apart rolling bearings, the flexible separator cage including interlocking first and second ends, the first end of the separator cage including a wall defining a projecting member and the second end of the separator cage including a wall defining a receiving member, the first end projecting member and the second end receiving member being in opposed facing relationship and the first end projecting member extending into the second end receiving member to secure the first end to the second end and form an annular, continuous rolling bearing ring.

Pipe joint connector (10) comprising a flexible elongate portion (12), wherein the flexible elongate portion is provided with a plurality of rotatable members (14).