1. Field of the Invention
This invention relates to a positioning device for the dust-collecting bag of a dust-collecting machine, particularly to one able to firmly position a dust-collecting bag on a dust-collecting machine in advance for facilitating sequent fixing of the dust-collecting bag.
2. Description of the Prior Art
A conventional medium-sized or large-sized dust-collecting machine is generally provided with a wind-exhausting box fixed thereon with a securing ring for the opening portion of dust-collecting bag to be fitted and positioned thereon, and then the opening portion of the dust-collecting bag is tightened and secured on the securing ring by an annular hoop. However, after the large-sized opening portion of the dust-collecting bag is fitted around the securing ring, if the opening portion is not fixed or held in advance, it is hard for one person to fit and tighten the annular hoop on the opening portion of the dust-collecting bag. Therefore, a clamping plate able to fix and position a dust-collecting bag in advance is designed and employed. This elongate clamping plate 10, as shown in
However, the contact surfaces of the first, the second and the third clamping edge 14, 15, 16 of the clamping plate 10 as well as the corresponding circumferential wall of the wind-exhausting pipe are straight and even; therefore, their clamping force applied to the body of the dust-collecting bag is in a vertical direction, having no function of engagement and resistance and unable to firmly fix the dust-collecting bag in position.
The objective of the invention is to offer a positioning device for the dust-collecting bag of a dust-collecting machine, provided with a wind-exhausting box and a plurality of positioning members. The wind-exhausting box has its annular wall bored with an annular engaging groove. Each positioning member is formed with a combining portion secured on the annular wall at the inner side of the annular engaging groove. The combining portion has one end extending and bent to form a clamping portion having its inner side formed with an arc-shaped projection to be closely engaged with the annular engaging groove of the annular wall. The clamping portion has its lower end extending outward obliquely and forming a pull member. When a dust-collecting bag is fitted around the annular wall, its opening portion can be elastically and firmly clamped by the arc-shaped projections of the positioning members and also closely engaged in the annular engaging groove of the annular wall, able to clamp and position a dust-collecting bag firmly to prevent it from slipping off.
This invention will be better understood by referring to accompanying drawings, wherein:
A preferred embodiment of a positioning device for the dust-collecting bag of a dust-collecting machine in the present invention, as shown in
Each securing ring 30, as shown in
Each positioning member 60 shaped as an elongate plate is formed with a straight and even combining portion 61 bored with plural insert holes 611 respectively aligned to the threaded holes 323 of the securing ring 30 so that the combining portion 61 of the positioning member 60 can be secured on the annular wall 32 by bolts 612 inserted through the insert holes 611 and screwed with the threaded holes 323. In addition, the combining portion 61 has one end formed with an arc-shaped clamping portion 62 extending toward the annular wall 32 and having its inner side formed with an arc-shaped projection 621 exactly able to be elastically and closely engaged in the annular engaging groove 322 of the annular wall 32. The arc-shaped clamping portion 62 has its lower end extending outward obliquely and forming a pull member 63 slanting away from the annular wall 32, with a pull opening 631 preset in size formed between the end of the pull member 63 and the annular wall 32.
In using of the positioning members 60, as shown in
To remove the dust-collecting bag 40 from the annular wall 32, as shown in
More specifically, the engaging portion 62 of the positioning member 60 has pressing resilience relative to the combining portion 61, and the arc-shaped projection 621 of the engaging portion 62 and the annular engaging groove 322 of the annular wall 32 are respectively arc-shaped for engaging each other; therefore, the opening portion 41 of the dust-collecting bag 40 can be clamped by the arc-shaped projection 621 and also engaged firmly in the arc-shaped annular engaging groove 322, able to firmly fix the dust-collecting bag 40 in position to prevent it from slipping off.
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.