Patent Application
20050161945
1. Field of the Invention
This invention relates to a cantilever wind-exhausting pipe, particularly to one able to precisely and stably adjust its wind port to a position needed for wind exhausting, convenient to be adjusted with little labor and with quickness.
2. Description of the Prior Art
An adjustable cantilever wind-exhausting pipe is commonly used at various places, such as an electron laboratory, an elementary training school, a chemical engineering organization or a barbershop. A conventional cantilever wind-exhausting pipe 10, as shown in
To adjust the wind port 111 of the multi-sectioned conventional wind-exhausting pipe 10 to face a position needed for wind exhausting, some or all of the adjustable locking members 125 are unscrewed one by one and one or some of the inflexible pipes 11 are turned to make the wind port 111 face a needed direction, and then the adjustable locking members 125 are screwed tight to finish adjustment.
As can be noted from the above description, the conventional multi-sectioned wind-exhausting pipe 10 has the following defects.
1. To turn the joint members 12 to adjust the wind port 111 to face a position needed for wind exhausting, firstly, the adjustable locking members 125 of the joint members 12 have to be orderly and respectively unscrewed, secondly the joint members 12 have to be turned one by one and lastly, and lastly the adjustable locking members 125 have to be screwed tight, complicated in operation of adjustment and unable to quickly adjust the wind port 111 to precisely face a position needed for wind exhausting.
2. The joint members 12 of the cantilever multi-sectioned wind-exhausting pipe 10 are usually located too high for a user to adjust directly; therefore the user has to stand on a table, a chair or the like so as to carry out adjustment of the joint members 12, resulting in much inconvenience in adjustment.
The objective of the invention is to offer a cantilever wind-exhausting pipe provided with plural joint members respectively assembled between every two inflexible pipes and each joint member is provided with a torsion spring fitted on a pivotal bolt. The torsion spring has its opposite ends respectively pressing two sets of connecting plates to cancel the gravity of the lower inflexible pipes, able to quickly turn the joint members with little force and precisely and stably adjust the wind port of the lowermost inflexible pipe to face a direction+needed for wind exhausting.
This invention will be better understood by referring to the accompanying drawings, wherein:
A preferred embodiment of a cantilever wind-exhausting pipe 20 in the present invention, as shown in
The joint members 50 are respectively provided between every two inflexible pipes 30, able to be pivotally turned and adjusted. Each joint member 50 consists of two sets of connecting plates 51, two friction blocks 52, a pivotal bolt 53 and a torsion spring 54.
Each set of connecting plates 51 includes two plates respectively formed with a fixing end 511 bent vertically and a pivotal connecting end 512. The upper set of connecting plates 51 has its two fixing ends 11 respectively and symmetrically secured on the lower outer wall of an upper inflexible pipe 30, letting its two lower pivotal connecting ends 512 separated from each other at a comparatively long distance. The lower set of connecting plates 51 has its two fixing ends 511 respectively and symmetrically secured on the upper outer wall of a lower inflexible pipe 30, letting its two pivotal connecting ends 512 separated from each other at a comparatively short distance. Thus, the lower set of connecting plates 51 is positioned at the inner side of the upper set of connecting plates 51 and separated from each other at a proper distance to form an accommodating gap 513 therebetween. Each connecting plate 51 has its pivotal connecting end 512 bored with a pivot hole 5121, and one upper connecting plate 51 and one opposite lower connecting plate 51 are respectively fixed with a bolt-shaped stop member 514 on the inner wall near the pivotal connecting end 512.
Two friction rings 52 are respectively received in the two accommodating gaps 513 formed between the two opposite pivotal connecting ends 512 of the two sets of connecting plates 51. Each friction ring 52 has its opposite sides respectively formed with a friction surface 521 to contact with the walls of the opposite pivotal connecting ends 512 and produce a frictional force to prevent the connecting plates 51 from turning pivotally. Further, each friction ring 52 is bored with an insert hole 522 in the center.
The pivotal bolt 53 is inserted through both the pivot holes 5121 of the pivotal connecting ends 512 of the two sets of connecting plates 51 and the insert holes 522 of the friction blocks 52, having its outer end screwed with a nut 531 to let the pivotal connecting ends 512 of the connecting plates 51 and the frictional surfaces 521 of the friction block 52 clamped with each other to produce a proper frictional force for fixing the two sets of connecting plates 51 in position.
The torsion spring 54 is fitted around an intermediate portion of the pivotal bolt 53 and has its opposite ends 541 respectively pushing against the two stop members 514 on the inner sides of the two sets of connecting plates 51 to press the two sets of connecting plates 51 with its elastic torsion. The elastic torsion of the torsion spring 54 is able to resist the gravity produced by the lower inflexible pipes 30 and supply the lower inflexible pipes 30 with an auxiliary supporting force.
The cantilever wind-exhausting pipe 20 of this invention can be installed on a wall of a laboratory or on certain portion of a worktable or the like. For instance, as shown in
Next, each joint member 50 has its turning tightness adjusted to a proper extent. Since the gravity of each lower inflexible pipe 30 is compensated by the elastic torsion of the torsion spring 54, it needs only a little frictional force between the pivotal connecting ends 512 of the connecting plates 51 and the friction rings 52 to prevent each lower in flexible pipe 30 from falling downward by its own gravity. Therefore, the turning frictional force between the pivotal connecting ends 512 of the connecting plates 51 and the friction ring 52 has to be first adjusted to an extent a little larger than the absolute value of the difference between the elastic torsion of the torsion spring 54 and the gravity of the lower inflexible pipe 30, and then the joint members 50 are respectively locked in position, with the least force needed in adjustment.
To adjust the wind port 31 of the lowermost inflexible pipe 30 of the cantilever wind-exhausting pipe 20 to face a position needed for wind exhausting, as shown in
Further, to elevate efficiency of controlling wind exhausting of the cantilever wind-exhausting pipe 20 of this invention, as shown in
Furthermore, in order to freely and precisely adjust the wind port 31 to a needed position, the lowermost inflexible pipe 30 has its lower and fixed with a bendable joint member 80 having its outer end connected with a trumpet-shaped wind-exhausting shade 90, with bellows 40 fitted between the lowermost inflexible pipe 30 and the wind port shade 90, enabling the wind port 91 of the wind-exhausting shade 90 to be freely and quickly adjusted to any location needed for wind exhausting.
While the preferred embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.
