US 6,041,475 AGranted

Locking counterbalance shoe for tiltably removable sash windows

AssigneeIntek Plastics, Inc.

InventorMichael J. Nidelkoff

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Abstract

An automatic locking brake shoe device for a double sash window is disclosed which is slidably disposed in the guide channel of the window jamb liner. The brake shoe device interconnects with an associated sash through a laterally projecting sash pin. The automatic locking brake shoe device comprises first and second brake shoe members that are pivotally connected for relative pivotal movement. The first member is connected to the window balance mechanism, and the second member includes a locking member that engages the jamb liner when it is rotated to the locking position. A small spring disposed between the first and second members normally urges the second member into the locking position when the sash is removed. The sash pin engages the second member when the sash is in its sliding position causing the small spring to yield and to attract the second member from the locking position.

Claims21

Dependent claims

An automatic locking device for use with a window slidably disposed within guide channels defined within opposed window jamb liners at least one of which has a balance mechanism associated therewith, the automatic locking device being disposable with said balance mechanism in said one channel and comprising:

engagement pin means adapted for connection to a window side and constructed and arranged to project laterally into one of said channels when so connected;
a first member sized and constructed to slide in said channel, the first member comprising connecting point means adapted for connection to said balance mechanism;
a second member pivotally connected to and pivotally moveable relative to the first member between sliding and locking positions, the second member comprising:
seat means for said engagement pin means constructed and arranged to engageably receive the engagement pin means and to be pivoted thereby to said sliding position;
and
jamb liner engaging locking means constructed and disposed to project externally of the automatic locking device to lockably engage the jamb liner with the second member pivoted to its locking position, and to retract from engagement with the jamb liner with the second member pivoted to its sliding position;
and biasing means disposed between the first and second members for normally urging the second member into said locking position, the biasing means being constructed and arranged to yield to the presence of said engagement pin means and thereby to permit movement of the second member to the sliding position.

4 more elements

engagement pin means adapted for connection to a window side and constructed and arranged to project laterally into one of said channels when so connected;
a first member sized and constructed to slide in said channel, the first member comprising connecting point means adapted for connection to said balance mechanism;
a second member pivotally connected to and pivotally moveable relative to the first member between sliding and locking positions, the second member comprising:
seat means for said engagement pin means constructed and arranged to engageably receive the engagement pin means and to be pivoted thereby to said sliding position;
and
jamb liner engaging locking means constructed and disposed to project externally of the automatic locking device to lockably engage the jamb liner with the second member pivoted to its locking position, and to retract from engagement with the jamb liner with the second member pivoted to its sliding position;
biasing means for normally urging the second member into said locking position, the biasing means being constructed and arranged to yield to the presence of said engagement pin means and to be pivoted to said sliding position thereby;
and
interlocking means for preventing the engagement pin from being lifted vertically from the seat means when the second member is in said sliding position.

6 more elements

Dependencies are inferred from the claim text.