Leading screw of a blind adjustment with confining parts

Abstract: A structure of a blind adjustment is operated by a rail and a shaft, and comprises a leading screw, a sliding seat, two confining parts, two adjustors and a housing. The leading screw is sleeved onto the shaft and having its two ends insert through connecting ends of the housing, respectively. The sliding seat and the confining parts are both threaded sleeved onto the leading screw and accommodating in the housing. The sliding seat will be linked by rotation of the leading screw to move whereas the two confining parts are designed to rotate without moving, thus upon one post of the sliding seat reaches to a protuberance of one of the confining part, the rotation of the sliding seat is blocked which then confines movement of the adjustor to adjust the height or angle of the blind.

Description: Field of the Invention: This invention relates to the structure of a blind adjustment according to the preamble of claim 1, and in particular to a confining design of an electric controlled blind. In DE-A-1 529 297 such a conventional design is disclosed. Background of the Invention: A conventional electrical window blind uses a micro switch to control the rolling on and off, but it can hardly change the angle of the blind and so forth. A recent design was developed, which secures a leading screw on a shaft with a sliding seat secured on the leading screw, thus, when rotating the leading screw, the sliding seat slides along the rail back and forth without rotation. The movement of the sliding seat will stop when it reaches to a bolt securing at one end of the shaft. However, in order to change the position of the bolt, many steps have to be taken. Further, the bolt will be forced directly by the sliding seat and will be ruined or damaged after a certain time of usage. Summary of the Invention: It is the primary object of the present invention to provide a structure of a blind adjustment, which is easy to operate and maintain. It is another object of the present invention to provide a structure of a blind adjustment, which is more stable and lasts longer. This is achieved by the structure of a blind adjustment according to claim 1. Brief Description of the Drawings: FIG. 1 is an exploded view of the present invention; FIG. 2 is a cross sectional view along the length of the present invention; FIG. 3 is a front cross sectional view of the present invention; FIG. 4 is a cross sectional view similar to FIG. 2, in operation; and FIG. 5 is a front cross sectional view of the present invention in operation. Detailed Description of the Preferred Embodiments: A structure of a window blind adjustment of the present invention comprises a leading screw 1, a sliding seat 2, two confining parts 3 and 4, two adjustors 5 and 6, a housing 7, a rail 8 and a shaft 9. The leading screw 1 comprises outer threads 11 and a through hole 12 along its length, one side of which is milled. The sliding seat 2 is a block having inner threads 21, which has a size that will fit into the housing 7 or the rail 8 and threaded sleeve onto the leading screw 1, the two ends are formed with posts 22 and 23 paralleling with the axle direction. Confining parts 3 and 4 are in cylindrical shape, each comprises a big hole 31 and 41 at center extending along the length, and is slightly larger than the outer diameter of the leading screw 1, the parts 3 and 4 may be sliding when the leading screw 1 rotates. Each confining part 3 and 4 has a protuberance 32 and 42 facing towards the sliding seat 2, a pair of reduced portions 33 and 43 are formed at respective ends of the confining parts 3 and 4. The protuberances 32 and 42 are in the direction facing the sliding seat 2, while the reduced portions 33 and 43 are towards the sliding seat 2. Two through hole 34 and 44 are formed on each confining part 3 and 4 from the surface penetrating through and interconnecting with the hole 31 and 41, respectively. For the purpose of securing the confining parts 3 and 4 onto or as a manual adjustor on the leading screw 1 by means of bolts, which comprises a knob for handling purpose. Each of the adjustors 5 and 6 is a piece with two claws 51 and 61 extending downward to engage with the reduced portions 33 and 43, a pair of slots 511 and 611 are formed above the claws 51 and 61 to be seated on the housing 7. The adjustors 5 and 6 are marked with indexes 52 and 62 for reading. The housing 7 is a longitudinal box with its top and bottom left open. The top edge is formed with a ledge at respective sides as a sliding rail 71 with index 711 thereon. The top frame of the housing 7 is further extending a pair of fixing plates 72 from respective ends. Each fixing plate 72 has a hole for a bolt 74 to insert there through and secure a fixture 73 onto the rail 8. The housing 7 has a pair of connecting ends 75 at respective ends with a hole 751 at center thereof. The rail 8 comprises a shaft 9, a ledge 81 on the top edges, and a cover 82 to seal the rail 8 from one end. To assemble the present invention, threads the sliding seat 2 onto the leading screw 1 and the two confining parts 3 and 4 are also sleeved onto the leading screw 1 with one on each side of the sliding seat 2 and the protuberances 32 and 42 facing a corresponding post 22 or 23. The two ends of the leading screw 1 are inserted through the two connecting ends of the housing 7, respectively. The slots 511 and 611 of the adjustors 5 and 6 are clamping into the sliding rail 71, wherein the index 52 and 62 point the index 711. The claws 51 and 61 of the confining parts 5 and 6 seat on the reduced portions 33 and 43 that slides along the leading screw 1 with the confining parts 3 and 4. Then, place the housing 7 into the rail 8 with the shaft 9 inserting into the leading screw 1, and secure the fixture 73 with the bolt 74 onto the two ends of the housing 7, and seal the rail 8 with the cover 82. Further, a second embodiment is considered as not to use the housing 7, but to place the whole parts into the rail 8 direct. In practice, rotating the shaft 9 links the leading screw 1 to rotate, which rotates the two confining parts 3 and 4 to rotate simultaneously, however, the adjustors 5 and 6 limit the parts 3 and 4 from sliding, whereas the sliding seat 2 will move along with the rotation of the leading screw 1 until the post 22 or 32 has reached to the protuberance 32 or 42 of the confining parts 3 or 4, then the sliding seat 2 will be stopped. To adjust the confining parts 3 and 4 simply by hand moves the parts 3 or 4 manually.

Claims: A structure of a blind adjustment operating by a rail (8) and a shaft (9), comprising a leading screw (1), a sliding seat (2), and two confining parts (3,4), wherein said leading screw (1) being inserted through and linked by said shaft (9), and said sliding seat (2) being threaded sleeved onto said leading screw (1), each said confining part (3,4) comprising a through hole (31,41) along the length having an inner diameter slightly larger than the outer diameter of said leading screw (1) to be sleeved on to said leading screw (1) and on each side of said sliding seat (2), and characterized by : said structure comprising two adjustors (5,6) for limiting said confining parts (3, 4) from sliding, and said sliding seat (2) comprising a pair of posts (22,23) at respective sides, each said confining part (3,4) further comprising a protuberance (32,42) parallel with the axle and facing inwardly towards said sliding seat (2), said adjustors (5,6) being seating on said rail (8) and said confining parts (3,4), respectively. The structure of a blind adjustment, as recited in claim 1, wherein each said confining part (3,4) comprises a pair of reduced portions (33,43), and each said adjustor (5,6) comprises claws (51,61) at respective end for said reduced portion to hold thereon. The structure of a blind adjustment, as recited in claim 1, further comprises a housing (7) having a pair of ledges (81) extending from the top edge thereof for sliding rail of said adjustors (5,6), said housing (7) further comprising a pair of connecting ends (75) at respective ends with a hole (751) on each end for insertion of said leading screw (1), said sliding seat (2) enable to slide only along said leading screw (1), and said housing (7) clamp on said rail (8). The structure of a blind adjustment, as recited in claim 3, wherein said housing has index (711) on said ledge (81). The structure of a blind adjustment, as recited in claim 5, wherein each said adjustor (5,6) has index (52,62) that corresponding to said index (711) of said ledges of said housing (7). The structure of a blind adjustment, as recited in claim 1, wherein each said confining part (3,4) comprises a vertical through hole (34,44) interconnect with said through hole (31,41) for a bolt to insert there through to secure said confining part (3,4) on said leading screw (1). The structure of a blind adjustment, as recited in claim 6, wherein said bolt comprises a knob for turning.

Inventors: TAO HSIU-CHIH, TAO, HSIU-CHIH
Applicants: TAO HSIU-CHIH, TAO, HSIU-CHIH
Application year: 2000
Main classification: E06B9
IPC codes: E06B9