Appeal No. 96-0873
Application 08/132,380
ends of the tube member 7. In addition, the elongated spring is secured to tube member 7
by a pin 6 located intermediate the ends of the tube member. One of De Vries’s
telescoping tubes is secured to the window sash and the other is secured to the window
jamb. In use, as the window sash is lowered, the elongated spring is compressed. At the
same time, the cooperation between the slotted ends of the tube member 7 and the spiral
strips 9 causes the tube member to rotate and wind up the elongated spring. A balancing
force is thus provided by a combination of (1) the axial compression of the elongated
spring; and (2) the vertical components of forces acting on the spiral strips as a result of
winding up the elongated spring (column 2, line 27 through column 3). The mechanism is
designed such that the net effect of forces (1) and (2) remains constant (column 3, lines 4-
16).
Maynard pertains to a retractable anchor for mounting in the floor of a compartment
of an aircraft or the like for providing an anchoring point for a structure such as a chair. The
anchor comprises an outer tubular member 1 mounted in the floor of the compartment, and
an attachment member 4 slidably received therein. A compression spring 6 is provided to
bias the attachment member to a projected position, see Figure 2, whereby aperture 11 in
the attachment member may be utilized as an anchor point. Bayonet connection means 8,
9 is provided between the members 1 and 4 such that when engaged, the attachment
member 4 is held in a retracted position, see Figure 1, flush with the floor.
3
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Last modified: November 3, 2007