Abstract: The immobilizing retainer for a child's jump chair is permanently or removably attached to the jump chair seat to extend therefrom. The retainer is formed of an inelastic, flexible length of material such as a strap, rope, cord, or the like, and is sufficiently long as to extend from the jump chair seat with a portion trailing across the underlying surface. A parent or caretaker for the child may step on the portion of the retainer resting on the surface to hold the jump chair seat in position while placing the child in the seat or lifting the child from the seat. This prevents the jump chair seat from swaying or rising as the child is placed in or lifted from the seat, thereby easing the effort of the caretaker to provide a safer operation. The retainer may be stored compactly on the jump chair when not in use.

Abstract: The trailer jack support block includes a solid rectangular parallelepiped member having surfaces for supporting the lower end of a trailer jack thereon. Attachment chains are provided for securing the support block to the trailer hitch. Grooves are provided on at least two surfaces for retaining the chains therein, if desired.

Abstract: The trailer jack support block includes a solid rectangular parallelepiped member having surfaces for supporting the lower end of a trailer jack thereon. Attachment chains are provided for securing the support block to the trailer hitch. Grooves are provided on at least two surfaces for retaining the chains therein, if desired.