The ornamental design for a pressingmember of horizontalsupporter for scaffolds, as shown and described.
FIG. 1 is an isometric view of a pressing member of horizontal support for scaffolds showing my new design.
FIG. 2 is a left side elevational view thereof.
FIG. 3 is a right side elevational view thereof.
FIG. 4 is a rear elevational view thereof.
FIG. 5 is a front elevational view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the pressing member of horizontal supporter for scaffolds and form no part of the claimed design.