US20040213674A1

US20040213674A1 - Removable blade of fan

Info

Publication number: US20040213674A1
Application number: US10/423,894
Authority: US
Inventors: Sam Chen
Original assignee: WISAM ENTERPRISES CO Ltd
Current assignee: WISAM ENTERPRISES CO Ltd
Priority date: 2003-04-28
Filing date: 2003-04-28
Publication date: 2004-10-28
Also published as: FR2855566A3

Abstract

Removable blades of fan include a rear base, a front cover corresponding to the rear base, and a plurality of frames covered with a plurality of sponge blades. Each of a plurality of sponge blades is inserted through a frame while a lug is positioned on one end of the frame. A flapper is arranged between the lug and the frame. Each of the frame is mounted between the rear base and the front cover by the lug. The front cover and the rear base, together with the sponge blades extending outward so as to form a casing for the main body of the fan.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to removable blades of fan, especially to a kind of sponge blades that can be assembled. The device includes a pair of rear base and front cover as a center for a plurality of sponge blades inserted with frames arranged annularly. Each of the sponge blades can be replaced respectively and is in different color so as to reduce the cost for repair and improve the appearance.

2. Description of the Prior Art

The blades of conventional fans are made of hard plastic being shaped integratedly. The conventional fan is composed of a patelliform center with a plurality of arched blades shaped directly and arranged annularly. The shortcomings of the above fans are as followings:

1. Insufficient safety: If the baby or young children put their fingers into the fan curiously while the blades made of hard plastic are rotating, they are easy to get trauma. Moreover, a reticular cover is covered on the surface of the fan so as to improve the safety. Yet at the same time the impedance of the wind blowing out is also increased. Thus cause a kind of waste of energy.

2. Lacking of variety: the conventional blades made of hard plastic by integrated shaping thus has the same color without any diversity. Thus, another kind of fan is invented which has a blade made of sponge. Due to the softness of the material, even user's finger touched the blade, it's no harm. The safety is improved. However, a new problem raised. Once one of the blades is damaged, the center of gravity for rotation is changed so that the central axle deviates from the original position to cause the worn out or the deviation of the inner mechanical structure. Furthermore, even only one of the blades is damaged, the whole set of blades need to be replaced. Thus cause the increasing of the cost. In addition, after the substitution of the blades, the center of gravity for rotation needs to adjust again. Otherwise the axle of the motor of the fan is easy to wear out. It's not only time-consuming but also reduce the lifetime of the motor axle.

SUMMARY OF THE INVENTION

Therefore it is the primary object of the present invention to provide removable blades of fan. A plurality of frames is mounted between a front cover and a rear base with sponge blades covered thereof so as to improve the safety of the device. If there are some damage, only a few frames need to be changed so as to reduce the cost. The sponge blades can also be changed with a variety of colors. Moreover, the present invention is easy to assemble.

BRIEF DESCRIPTION OF THE DRAWINGS

The accomplishment of the above-mentioned object of the present invention will become apparent from the following description and its accompanying drawings which disclose illustrative an embodiment of the present invention, and are as follows: [0008]
FIG. 1 is an explosive view of the present invention; [0009]
FIG. 2 is a front view of a rear bade with a sponge blade of the present invention; [0010]
FIG. 3 is a cross sectional view of FIG. 2 along the line [0011] 3-3;
FIG. 4 is a rear view of the front cover of the present invention; [0012]
FIG. 5 is a perspective view of a frame of the present invention; [0013]
FIG. 6 is a lateral view of the present invention; [0014]
FIG. 7 is an embodiment the present invention.[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Refer to FIG. 1, the present invention is composed of a [0016] rear base 10, a front cover 30, and a plurality of frames 20 covered by a plurality of sponge blades 40, as shown in FIG. 7. Refer to FIG. 1 & FIG. 2, an axle bore 11 is positioned on the center of the rear base 10. The rear base 10 having a plurality of bracket frames 12 positioned radially with openings facing outwards. One end of the bracket frame 12 with opening bent inwards to form a blade-intake groove 15 and a slot 14. A locating plug 13 is disposed on the center of each bracket frames 12.
Refer to FIG. 1 & FIG. 4, the [0017] front cover 30 having a axle bore 31 disposed on the center thereof, a plurality of bracket frames 32, with openings facing outwards, arranged radialized, a blade-intake groove 35 and a slot 34 formed by the inward bend of one end with opening of the bracket frames 32, and a hollow tube base 33 positioned in the center of the bracket frames 32.
Refer to FIG. 2, FIG. 3 & FIG. 7, a [0018] frame 20 is disposed on the center axle of a sponge blade 40. The frame 20, as shown in FIG. 5, is a rectangular plate with a plurality of holes 25. The holes 25 are penetrated by the sponge blades 40. Refer to FIG. 5, a ventricular end plate 27 is disposed on one end of the frame 20 while a lug 21 with a mounting hole 22 is positioned on the other end thereof. Between the lug 21 and the main body of the frame 20 is a flapper 23 with a step-like part 24. At least a projecting rib 26 is arranged on each of the lateral side of the frame 20. The projecting rib 26 is tapered from the end of the frame 20 with the lug 21 to the other end with the end plate 27, as shown in FIG. 3, and is inclined in a certain angle −θ to the frame 20.
Refer to FIG. 1 & FIG. 2, the [0019] lug 21 of the frame 20 is mounted on the bracket frame 12 of the rear base 10. The locating plug 13 inserts through the mounting hole 22 while the step-like part 24 of the flapper 23 is mounted into the slot 14. One end of the sponge blades 40 is positioned into the blade-intake groove 15. Refer to FIG. 1 & FIG. 6, the front cover 30 corresponds to the rear base 10, and the two bracket frames 32, 12 corresponds to each other. The other end of the flapper 23, opposite to the step-like part 24, is mounted into the slot 34 of the front cover 30. While the locating plug 13, inserting through the mounting hole 22 of the frame 20, interlocks the hollow tube base 33 of the front cover 30. Thus construct a casing for the main body of the fan.
Refer to FIG. 1 & FIG. 6, and [0020] bolt 61 is positioned on the center of a block cover 60. A turning axle 51 of the main body of fan 50 inserts through the rear base 10 and the front cover 30 and then screws the bolt 61 so as to construct a whole casing of the fan.
The present invention has the following advantages: [0021]
1. The blades with sponge of the present invention improve the safety. Due to the design of the present invention, only a single worn-out frame with sponge blade needs to be replaced so that the cost is down. And the color of each of the sponge blades can be different. [0022]
2. The frames are positioned between the front cover and the rear base. It's easy and convenient to change the damaged frame. [0023]
3. There must be some inaccuracy during the production of the frame with sponge blade. The present invention can choose and adjust the combination of the frames with sponge blade. [0024]
It should be noted that the above description and accompanying drawings are only used to illustrate some embodiments of the present invention, not intended to limit the scope thereof. Any modification of the embodiments should fall within the scope of the present invention. [0025]

Claims

What is claimed is:

1. Removable blades of fan comprising

a rear base,

a front cover corresponding to the rear base,

and a plurality of frames covered with a plurality of sponge blades;

wherein the rear base and the front cover are disposed on a turning axle with a plurality of bracket frames arranged annularly thereof respectively; a slot is positioned on one end of the bracket frame which has an opening;

each of a plurality of sponge blades is inserted through a frame while a lug is positioned on one end of the birn; a flapper is arranged between the lug and the frame;

each of the frame is mounted on the bracket frame of the rear base and the front cover by the lug and the flapper is mounted into the slot so as to connect the front cover and the rear base, together with the sponge blades extends outward, thus form a casing for the main body of the fan.

2. The removable blades of fan as claimed in claim 1, wherein a blade-intake groove is arranged on the outer side of the slot of the bracket frame for mounting one end of the sponge blade.

3. The removable blades of fan as claimed in claim 1, wherein a mounting hole is positioned on the lug of the frame while a locating plug is disposed on at least one bracket frame of the front cover or rear base; the locating plug inserts through the mounting hole for fixing the frame firmly.

4. The removable blades of fan as claimed in claim 1, wherein at least a hole is disposed on the frame for connecting the sponge blade.

5. The removable blades of fan as claimed in claim 1, wherein a ventricular end plate is disposed on one end of the frame.

6. The removable blades of fan as claimed in claim 1, wherein the flapper having a step-like part.

7. The removable blades of fan as claimed in claim 1, wherein at least a projecting rib is arranged on each of the lateral side of the frame; the projecting rib is tapered from the end of the frame with the lug to the other end with the end plate and is inclined at a certain angle −θ to the frame.

8. The removable blades of fan as claimed in claim 1, wherein a bolt is positioned on the center of a block cover on the center of the front cover.