As an example, in the temperature control portion 3, the groove portion 301 abuts the lower end of the closure portion 22 to become a closure receiving portion. As an example, the edge portion 311 of the sample cup 31 may abut the closure portion 22 to become a closure receiving portion. As an example, the upper plate portion 32, more specifically, a peripheral edge portion of the hole portion 321 may abut the closure portion 22 to form a closure receiving portion. In other words, the closure receiving portion of the temperature control portion 3 is constituted by one or more of the groove portion 301, the edge portion 311, and the peripheral edge portion of the hole portion 321.

Preferably, the lower end of the gap adjustment portion 222 of the closure portion 22 abuts the groove portion 301, and the lower end of the accommodation portion 221 abuts the edge portion 311 of the sample cup 31. This facilitates adjustment of the gap between the rotor 21 and the inner bottom surface of the sample cup 31 by the gap adjustment portion 222.

As an example, the pair of fitting portions 33 is provided symmetrically behind the frame of the temperature control portion 3. The configuration of the fitting portions 33 is not particularly limited as long as the guide pins 23 of the viscometer 2 can be inserted therein while being lowered. A specific example of the fitting portions 33 will be described later.

The in-plane movement portion 34 is a portion for integrally planarly moving the temperature control portion 3. The configuration of the in-plane movement portion 34 is not particularly limited as long as the in-plane movement portion 34 is capable of moving two-dimensionally (X and Z directions), in other words, sliding on a horizontal plane. The lower end surface of the temperature control portion 3 may be configured to be slidable, and this lower end surface may constitute the in-plane movement portion 34. The in-plane movement portion 34 may be constituted by a slidable plate or roller attached to the lower end of the temperature control portion 3. The in-plane movement portion 34 is preferably constituted by four ball casters attached to the lower end of the temperature control portion 3 as illustrated in the drawings. The number of the ball casters may be three, five, or more as long as the ball casters can translate on the placement surface.

The urging portion 35 is a portion that brings the temperature control portion 3 into close contact with the main body 20 of the viscometer 2. As illustrated in FIG. 5, the urging portion 35 includes, for example, a plurality of springs that urge the upper surface of the frame of the main body 30 upward. As an example, the temperature control portion 3 includes a plurality of foot portions 37 connecting the upper surface and the lower surface of the frame of the main body 30, the urging portions 35 are incorporated in a portion close to the lower side of the foot portions 37, and the urging portions 35 elastically press the upper surface of the frame upward via the cylindrical portions of the foot portions 37.

FIGS. 6A and 6B are diagrams for describing an example of a fitting portion, in which FIG. 6A is a partially enlarged view of FIG. 4, and FIG. 6B is an exploded top view of FIG. 4. Here, the fitting portion 33 will be described more specifically. As an example, the fitting portion 33 is configured in a two-step structure, and includes an adjustment portion 331 and a T-shaped bush 332 overlapping the adjustment portion 331. The bush 332 is adjustably fixed to the adjustment portion 331 by a fastening member (for example, a bolt and a nut, a screw, or the like).

As an example, the adjustment portions 331 are provided symmetrically in the left-right direction so as to extend rearward at respective portions near left and right ends of the rear end of the upper surface of the frame of the temperature control portion 3. The adjustment portion 331 may be formed integrally with the upper surface of the frame as illustrated in FIG. 6B, or may be formed separately and attached thereto. For convenience of description, in the description below the adjustment portions 331 are illustrated and described as separate members.

FIGS. 7A to 7E are diagrams for describing an example of a fitting portion, in which FIG. 7A illustrates the entirety of the fitting portion as viewed from above, FIG. 7B illustrates the adjustment portion as viewed from above, FIG. 7C illustrates the bush as viewed from above, FIG. 7D illustrates the entirety of the fitting portion as viewed from the side, and FIG. 7E illustrates a longitudinal section view (Y-Z section view) in a disassembled state.

The adjustment portion 331 has a flat plate shape and has a hole portion 3311 through which the bush 332 is inserted, and a pair of hole portions 3312 for fastening the bush 332. Each of the hole portion 3311 and the hole portions 3312 is a through hole, and has an inner diameter larger than that of a corresponding portion of the bush 332, so that the in-plane position (in the X and Z directions) of the bush 332 can be adjusted.

The bush 332 includes a connecting portion 3321 having a flat plate shape, a cylindrical portion 3322 vertically protruding downward from the connecting portion 3321, and a positioning portion 3323 penetrating the connecting portion 3321 and the cylindrical portion 3322. In the bush 332, the cylindrical portion 3322 is inserted into the hole portion 3311 of the adjustment portion 331, and the connecting portion 3321 remains on the upper surface of the adjustment portion 331 and overlaps as an upper layer.

The connecting portion 3321 has, on opposing sides of the positioning portion 3323, a pair of hole portions 3324 for being fastened to the adjustment portion 331. The hole portion 3324 is a through hole, and has an inner diameter smaller than the inner diameter of the hole portion 3312 of the adjustment portion 331. The hole portion 3324 is preferably a counterbore from which the head of a bolt or a screw does not protrude.

As illustrated in FIG. 7E, the outer diameter (d2) of the cylindrical portion 3322 is smaller than the inner diameter (d1) of the hole portion 3311 of the adjustment portion 331. With such a configuration, the position of the cylindrical portion 3322 is adjusted within the inner diameter d1 of the hole portion 3311, whereby the in-plane position (in the X and Z directions) of the positioning portion 3323 can be adjusted.

The positioning portion 3323