Abstract A window unit having a stationary window frame and an upper and lower sash slidably mounted within the frame is disclosed. The window frame includes interior and exterior metal portions and a thermal barrier element interspaced therebetween to minimize heat transfer from and moisture condensation on the interior metal portions. The metal portions are joined to the thermal barrier element by providing each metal portion with an elongated Ushaped female portion which receives an elongated male portion of the thermal barrier element. Longitudinally spaced portions of at least one leg of each U-shaped female portion are plastically deformed into longitudinally extending channels formed in the male portions to complete the connection. The upper and lower sashes are each provided with a nonmetallic thermal barrier sash guide providing the sole contact between the sashes and their tracks formed in the stationary frame to minimize heat transfer through the sash guide from the interior metal portions of the window frame. The upper and lower sashes are each provided with a storm window unit having a nonmetallic thermal barrier frame which covers substantially all interior exposed lateral surfaces of the window sash to prevent moisture condensation thereon.
In combination, a metallic window sash slidably mounted in a track of a window frame, and a substantially nonmetallic storm frame detachably mounted on said window sash and slidably carried therewith in said window frame, said nonmetallic storm frame including means covering substantially all interior lateral surfaces of said metallic window sash for preventing moisture condensation thereon.
Claim 2
Dependent Claim
57 words
In combination, a metallic window sash slidably mounted in a track of a window frame, and a substantially nonmetallic storm frame detachably mounted on said window sash and slidably carried therewith in said window frame, said nonmetallic storm frame including means covering substantially all interior lateral surfaces of said metallic window sash for preventing moisture condensation thereon.
Claim 3
Dependent Claim
43 words
A combination as defined in claim 1 wherein said nonmetallic storm frame carries a glass for cooperating with a glass carried by said window sash to define a dead air space, and said means includes a flange portion covering said interior lateral surfaces.
Claim 4
Dependent Claim
63 words
A combination as defined in claim 1 wherein said nonmetallic storm frame includes a first portion carrying a glass, and said means includes a second portion extending laterally outwardly from said first portion covering said interior lateral surfaces and a sealing means extending between said second portion and said interior lateral surfaces for preventing circulating contact of air with said interior lateral surfaces.
Claim 5
Dependent Claim
68 words
A combination as defined in claim 1 wherein said metallic window sash includes an indented portion, said indented portion receiving a first portion of said storm frame, said first portion of said storm frame carrying a glass, and said first mentioned means including lip means extending laterally from said first portion and covering said interior lateral surfaces for preventing circulating contact of air with said interior lateral surfaces.