Hydraulic pedal type telescopic ground-pulled double-screen projection screen
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TIANHE COLLEGE GUANGDONG POLYTECHNIC NORMAL UNIV
- Publication Date
- 2019-12-20
- Estimated Expiration
- Not applicable · inactive patent
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Abstract
Description
technical field
[0001] The invention relates to the field of projection screens, in particular to a ground-pull double-screen projection screen that can be retracted by hydraulic pedals. Background technique
[0002] At present, the commonly used projection screens are mainly divided into: manual self-locking screens, electric screens, bracket screens, floor screens, and picture frame screens. Manual self-locking screens are very popular among consumers for their favorable price and easy installation. The disadvantage is that during long-term use, especially for screens over 80 inches, it is best not to choose manual screens, because the central pull-down force and other reasons will appear " V" type corrugation affects the flatness of the screen. For example, a projector screen disclosed by the publication number CN206725949U, when in use, the thin plate is unfolded to form a whole board, and after the reel is hung or fixed to the wall, the screen is pulled out from the ree...