An awning mounting rack includes four stand columns; a first folding bracket is disposed between two adjacent stand columns; each stand column has a top holder. The top holder includes a first pole, a second pole and a support pole. The four stand columns include two first stand columns and two second stand columns; the other ends of the second poles connected to the first stand columns are pivot joined to the first top set, the non-end portions of the second poles connected to the first stand columns are respectively pivot joined to a first support rod, the ends of the first support rods are pivot joined to a first bottom set; the other end of the second poles connected to the second stand column are pivot joined to a second top set, the non-end portions of the second poles are pivot joined to a second support rod.

An awning mounting rack includes four stand columns; a first folding bracket is disposed between two adjacent stand columns; each stand column has a top holder. The top holder includes a first pole, a second pole and a support pole. The four stand columns include two first stand columns and two second stand columns; the other ends of the second poles connected to the first stand columns are pivot joined to the first top set, the non-end portions of the second poles connected to the first stand columns are respectively pivot joined to a first support rod, the ends of the first support rods are pivot joined to a first bottom set; the other end of the second poles connected to the second stand column are pivot joined to a second top set, the non-end portions of the second poles are pivot joined to a second support rod.

A damping positioning device and a sunshade awning is provided. The damping positioning device comprises a fixing member and a damping member rotatably hinged on the fixing member. The damping member is provided with a curved slot or curved hole which allows for a rod to pass through and has the function of damping positioning. The damping positioning device is adopted to position the oblique rods in the sunshade awning which plays an adjustment role, in order to make sliding-based adjustment and self-positioning, and realize the purposes of adjusting the sunshade angle and folding the sunshade awning.

A damping positioning device and a sunshade awning is provided. The damping positioning device comprises a fixing member and a damping member rotatably hinged on the fixing member. The damping member is provided with a curved slot or curved hole which allows for a rod to pass through and has the function of damping positioning. The damping positioning device is adopted to position the oblique rods in the sunshade awning which plays an adjustment role, in order to make sliding-based adjustment and self-positioning, and realize the purposes of adjusting the sunshade angle and folding the sunshade awning.

A tent support includes a plurality upright rods, a top module provided at a center of a top of the tent support, a plurality of side rod assemblies each connected to every adjacent two of the upright rods, and a plurality of top rod assemblies connected to the side rod assemblies and the top module. At least one positioning hole is provided at a junction of two adjacent side walls of each upright rod. A sliding seat provided on each upright rod includes a positioning member which is selectively engaged in the positioning hole, a spring, a positioning pin and an outward protruding button therein. The tent support, as a whole, is simple in structure, easy to assemble, and stable in positioning.

Disclosed are tent frames and tents. A tent frame includes first and second top poles, first and second connectors, and a locking mechanism. Each of the first and second top poles has a first end portion and a second end portion. The first connector is fixedly coupled to the first end portion of the first top pole, and slidably coupled to and movable along the second pole. The second connector is fixedly coupled to the first end portion of the second top pole, and slidably coupled to and movable along the first top pole. The locking mechanism selectively restricts the first and second top poles from moving with respect to each other.

Disclosed are tent frames and tents. A tent frame includes first and second top poles, first and second connectors, and a locking mechanism. Each of the first and second top poles has a first end portion and a second end portion. The first connector is fixedly coupled to the first end portion of the first top pole, and slidably coupled to and movable along the second pole. The second connector is fixedly coupled to the first end portion of the second top pole, and slidably coupled to and movable along the first top pole. The locking mechanism selectively restricts the first and second top poles from moving with respect to each other.

The present invention is directed toward a movable airborne contaminant control system having a retractable/extendable booth attached in a sealing manner to a ventilation unit, preferably mounted on wheels. The ventilation unit includes a filter assembly that opens into the work are formed by the booth. Front doors support air filters. In operation, the ventilation unit draws air in a longitudinal laminar flow over one or more work pieces. The filter assembly captures both particulates and VOCs to allow the exhaust air to include an extremely low contaminant load.

The present invention is directed toward a movable airborne contaminant control system having a retractable/extendable booth attached in a sealing manner to a ventilation unit, preferably mounted on wheels. The ventilation unit includes a filter assembly that opens into the work are formed by the booth. Front doors support air filters. In operation, the ventilation unit draws air in a longitudinal laminar flow over one or more work pieces. The filter assembly captures both particulates and VOCs to allow the exhaust air to include an extremely low contaminant load.

A foldable tubular construct/element with one rigid degree of freedom is of a tubular construction formed by a number of single layered annular units which are connected in sequence; each single layered annular unit is of a prism having N ridge lines; two adjacent prisms each having N sides are connected to each other by sharing a polygon with N sides formed on an intersection plane; each prism with N ridge lines is composed of N rigid planar quadrilateral facets; two adjacent single layered annular units comprise N spherical mechanisms formed by the intersections of only four planar quadrilateral facets at each apex; the polygon having N sides formed in the intersection plane of the two adjacent single layered annular units is a planar polygon with an arbitrary number of sides greater than for a triangle; the ridge lines of each prism having N ridge lines are parallel to each other; the connecting ridge lines of the tubular element are coplanar; when the polygon having N sides formed in the intersection plane of the two adjacent single layered annular units is a line-symmetric polygon of even number of sides with at least one diagonal symmetric axis, the plane in which connecting ridge lines of the tubular element are located is perpendicular to one diagonally symmetric axis.