Abstract: A rack assembly has two support frames and at least one shelf that are secured to the support frames by connecting assemblies. Each connecting assembly comprises a well secured to a medial surface of each vertical tube of the support frame, and a hook that extends from each end of each shelf, with each hook having an opening extending therethrough. The connecting assembly also includes a connector that is seated inside each well, each connector having a top plate that has an elongated opening, the connector also having a body that is sized and configured to fit inside a well, the body defining two wings with a space between the wings, and wherein each wing has a bump positioned in the center of the inner surface of each wing that faces the space. Each hook is inserted through the elongated opening of a corresponding connector with the bump on each wing fitted inside the opening of the hook to retain the hook inside the body of the connector.

Abstract: A modular stand apparatus offers safe and effective setup of laboratory experiments. The apparatus allows a user to couple vertical rods to a first plate. A second plate, parallel to the first plate and vertically translating up and down the vertical rods, permits the user of any height to utilize the apparatus and the placement of an extraneous rigging such as jack, scale, etc. A plurality of horizontal rods including hypotenuse and adjacent rods detachably couples with the vertical rods and permits the placement of extraneous rigging. The horizontal rods replace monkey bars in conventional systems so that the user does not have to lean or stretch hands/arms inside a fume hood, thus eliminating potential unsafe operations and/or physical injuries. Due to the use of a larger and more stable surface of the second plate over the extraneous rigging, the apparatus eliminates possible toppling over and/or system collapsing.

Abstract: A shelf connector includes a sliding sleeve and a locking sleeve. The sliding sleeve is formed with a locking body thereon. The locking body is provided with an open groove along the axial direction of the sliding sleeve. The locking body is provided on both sides of the open groove with clasping portions. The locking sleeve is provided with a locking groove thereon. After the clasping portion is inserted into the locking groove, the width of the open groove can be reduced. With the above arrangement, in assembling, the sliding sleeve can be conveniently positioned to any suitable position of the supporting rod and locked thereto with the insertion of the locking sleeve. Since the locking sleeve itself has mounting portions for mating with the frame body of the shelf, or the locking sleeve itself is the end portion of the frame body of the shelf, the connection of the whole shelf becomes very simple.