Patent Application
20080080949
With reference to
In a first embodiment in accordance with the present invention, the clipping flange (12) of the outer wing (10) is curved and has an inner thread (121).
In a second embodiment in accordance with the present invention, the clipping flange (12A) of the outer wing (10) is inclined relative to the limb (11) and has a tip (121A).
The inner wing (20) is mounted pivotally on the outer wing (10) and comprises a limb (21), a clipping flange (22) and two sidewalls (23). The limb (21) is a rectangular sheet, slightly narrower than that of the outer wing (10) and has a proximal end, a distal end, two edges and a mounting element (211). The mounting element (211) is formed on the limb (21) near the distal end. The clipping flange (22, 22A) is formed on the proximal end of the limb (21) and may be curved or inclined relative to the limb (21). The sidewalls (23) are formed perpendicularly and respectively on the edges of the limb (21) and each has a protruding end (231), a through hole (232) and a mounting flange (233). The protruding end (231) of the sidewall (23) is curved and protrudent relative to the proximal end of the limb (21). The through hole (232) is defined through the sidewall (23) near the protruding end (231). The mounting flange (233) is formed around the through hole (232) and is mounted in the through hole (132) of one of the sidewalls (13) of the outer wing (10). The mounting flanges (233) is riveted to connect the inner and outer wings (10, 20) stably. One of the sidewalls (23) further has a fastening element (234) form on the sidewall (23).
In the first embodiment, the clipping flange (22) of the inner wing (20) is curved and has an inner thread (221).
In the second embodiment, the clipping flange (22A) of the inner wing (20) is inclined relative to the limb (21) and has a tip (221A).
The spring (30) is mounted in the inner and outer wings (10, 20) and has a body (31) and two legs (32). The body (31) is mounted between the sidewalls (13, 23) of the inner and outer wings (10, 20). The legs (32) are connected to the body (31), are engaged respectively with the inner and outer wings (10, 20) and each has a mounting end. One of the legs (32) and extends through the fastening element (234) of on the limb (21) of the inner wing (20) and is fastened on and engaged with the mounting element (211) of the inner wing (20). The mounting ends of the legs (32) are engaged respectively with the mounting elements (111, 211) of the limbs (11, 21) of the wings (10, 20). When the inner and outer wings (10, 20) are compressed toward each other, the spring (30) is also compressed to be capable of expanding the inner and outer wings (10, 20).
The bolt (40) is inserted through the body (31) of the spring (30) and extends between the clipping flanges (12, 22, 12A, 22A) of the inner and outer wings (10, 20) and has an outer thread (41). In the first embodiment, the outer thread (41) corresponds to and is selectively clipped by the inner threads (121, 221) of the clipping flanges (12, 22). When the inner and outer wings (10, 20) are expanded, the outer thread (41) of the bolt (40) is clipped by the inner threads (121, 221) of the clipping flanges (12, 22) or the tips (121A, 221A) of the clipping flanges (12A, 22). When the inner and outer wings (10, 20) are compressed slightly to make the bolt (40) being released from the clipping flanges (12, 22), the bolt (40) can be moved slidably relative to the body (31) of the spring (30) to any suitable position without rotating the bolt (40). Therefore, to adjust the position of the bolt (40) is easy and convenient.
When the spring toggle is in use, the outer and inner wings (10, 20) are compressed fully against the bolt (40) and the spring toggle is inserted into a fastening hole through a wall or a ceiling. When the inner and outer wings (10, 20) are compressed fully against the bolt (40), the body (31) of the spring (30) will be compressed to securely hold and keep the bolt (40) from moving relative to the body (31). Thus, the bolt (40) will not be moved relative to the spring (30) and the outer and inner wings (10, 20) during the travel of inserting the spring toggle into the fastening hole. After the outer and inner wings (10, 20) extend out of the fastening hole in the wall or ceiling, the outer and inner wings (10, 20) are expanded by the spring (30) and abut the wall or ceiling when the bolt (40) is pulled backward. Consequently, the spring toggle is prevented from being escaped from the fastening hole. When the outer and inner wings (10, 20) are expanded, the bolt (40) is clipped with the clipping flanges (12, 12A, 22, 22A) of the outer and inner wings (10, 20) to hold the bolt (40) in a desired place. With the abutment between the outer and inner wings (10, 20) and the wall or ceiling, a force for pushing the clipping flanges (12, 12A, 22, 22A) toward each other is applied to the outer and inner wings (10, 20) when an external force is applied to pull the bolt (40) downward. Accordingly, the bolt (40) is clipped tightly between the clipping flanges (12, 12A, 22, 22A) and is kept from being pulled back even though a heavy weight is loaded onto the bolt (40).
Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only. Changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
