Title:
Double-acting pneumatically operated door opener
United States Patent 2676796


Inventors:
Meyerholz, Rheinier I.
Application Number:
US16620150A
Publication Date:
04/27/1954
Filing Date:
06/05/1950
Assignee:
Meyerholz, Rheinier I.
Primary Class:
Other Classes:
49/32, 49/336
International Classes:
E05F15/04
View Patent Images:
US Patent References:
2641466Control means for automatically operated doors1953-06-09
2624569Door opening and closing mechanism1953-01-06
2536489Actuator for door opening mechanisms1951-01-02
2368722Door operator1945-02-06
2283577Apparatus for operating doors1942-05-19
2243310N/A1941-05-27
2011652Multiple unit treadle door control apparatus1935-08-20
2009081Multiple unit treadle controlled door system1935-07-23
1835103Doorcheck device1931-12-08
1276431N/A1918-08-20
0615194N/A1898-11-29