Electric projection screen roller structure
An electric projection screen roller structure includes a rolling shaft and an inserting piece. The rolling shaft is provided with a sliding groove in one side surface, a flanged strip and a hollow are formed adjacent to the sliding groove, and a slant inserting block is provided adjacent to the hollow. A plurality of notches and flanged portions are provided adjacent to the slant inserting block. The inserting piece is provided with a flanged block on one side, a hollow s formed in the interior, a slant hook portion is provided at one side of the hollow, and a plurality of notches and flanged portions are provided adjacent to the slant hook portion.
1. Field of the Invention
The present invention relates to an electric projection screen roller structure, the roller structure being provided in a protective housing. More particularly, the present invention is directed to a roller structure which includes a rolling shaft and an inserting piece, so as to be easily assembled and firmly secure one end section of a projection screen, for the projection screen to smoothly unwind from the roller structure to descend below or wind around the roller structure to a raised, storage position.
2 Description of the Related Art
Various activities to pass on knowledge and information are frequently held in modern times. Projectors are widely used as auxiliary teaching tools in most teaching activities. Accordingly, a projection screen is indispensable for showing the projected content from the a projector.
While being used, referring to
A conventional projection screen roller 30 does not be provided with any structure for securing one end section of the projection screen 20, but a piece of tape 40 is adhered on a predetermined surface position of the roller 30 for ene end section of the projection screen 20 to be secured thereto. Although it can secure one end section of the projection screen 20 to the surface position of the roller 30 by the tape 40, there are the following drawbacks in the structure of the conventional projection screen roller after being used for a period of time
1. The tape 40 adhered on the surface of the roller 30 will lose stickiness after contacting with the projection screen 20 for a period of time, so that the end section of the projection screen 20 will easily separate from the roller 30.
2. Because of the changes of temperatures, the tape 40 adhered on the surface of the roller 30 will lose stickiness after being used for a period of time, so that the end section of the projection screen 20 will easily separate from the roller 30.
SUMMARY OF THE INVENTIONTherefore, the present invention is designed to provide an electric projection screen roller structure that substantially obviates the drawbacks of the related conventional art.
An object of the present invention is to provide an electric projection screen roller which can be easily assembled or disassembled.
Another object of the present invention is to provide an electric projection screen roller structure which can firmly secure one end section of a projection screen to prevent from separation after being used for a long time, so as to prolong the service life of the projection screen and the roller structure.
To achieve these advantages, the present invention provides an electric projection screen roller structure. The roller structure includes a rolling shaft and an inserting piece. The rolling shaft is provided with a sliding groove in one side surface, a flanged strip and a hollow are formed adjacent to the sliding groove, and a slant inserting block is provided adjacent to the hollow. A plurality of notches and flanged portions are provided adjacent to the slant inserting block. The inserting piece is provided with a flanged block on one side, a hollow is formed in the interior, a slant hook portion is provided at one side of the hollow, and a plurality of notches and flanged portions are provided adjacent to the slant hook portion.
BRIEF DESCRIPTION OF THE DRAWINGSOther features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which
Referring to
The inserting piece 2 is provided with a flanged block 21 on one end, a hollow 22 is formed in the interior, a slant hook portion 23 is provided at one side of the hollow 22, and a plurality of flanged portions 24 and notches 25 are provided adjacent to the slant hook portion 23.
Referring to
While the preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made thereto and the appended claims are intended to cover all such modifications which may fall within the spirit and scope of the invention.
Claims
1. An electric projection screen roller structure comprising:
- a rolling shaft being provided with a sliding groove in one predetermined side surface, a flanged strip and a hollow being formed adjacent to said sliding groove, a slant inserting block being provided adjacent to said hollow of said rolling shaft, notches and flanged portions being provided adjacent to said slant inserting block; and,
- an inserting piece being provided with a flanged block on one end, a hollow being formed in the interior of said inserting piece, a slant hook portion being provided at one side of said hollow of said inserting piece, flanged portions and notches are provided adjacent to said slant ook portion.
Type: Application
Filed: Jan 13, 2004
Publication Date: Jul 14, 2005
Inventor: Hsin-Fu Lin (Tainan)
Application Number: 10/755,302