DURABLE SANDER AND OSCILLATION BUFFER ELEMENT APPLIED TO SANDER
A durable sander comprises a body with a drive motor, a sanding disk driven by the drive motor to perform sanding movement against the body and at least one oscillation buffer element. The oscillation buffer element includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and lower connection bar in an integrated manner. Each buffer portion has a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and second connection end. The length of the elastic buffer section is greater than the distance between the first connection end and the second connection end.
The present invention relates to a sander and particularly to an oscillation buffer element used in a sander.
BACKGROUND OF THE INVENTIONSanders are machine tools driven by high pressure gas or electric power to grind the surface of objects. A conventional sander comprises a drive motor to receive the high pressure gas or electric power as the driving source and a sanding disk driven by the drive motor. During sanding operation the sanding disk is bonded to a replaceable sandpaper and driven by the drive motor to make high speed oscillation about a moving track. The grinding granules of the sandpaper are is contacted with an object to flatten and smooth the contact surface or remove other object attached to the surface.
During the sanding disk performing the high speed oscillation, an oscillation force is generated and transmitted to the sander body through a driving shaft of the drive motor. Hence operators have to apply extra effort to stabilize operation of the sander. The conventional sander generally has at least one cylindrical pillars to connect the sander body and sanding disk. For instance, U.S. Pat. Nos. 8,231,437, 7,056,199, 3,862,520, 3,815,292 and 3,345,784 disclose a sander with elastic pillars installed in four corners of the sander body to fasten the sanding disk. The elastic pillars can be a single strut at a greater diameter, or a cluster structure consisting of multiple elastic struts, as shown in U.S. Pat. No. 6,705,931. On the other hand, U.S. Pat. Nos. 7,771,253, 6,979,254, 6,855,040 and 5,626,510 disclose another type of sanders with two rows of clustered vertical pillars respectively installed in the front side and rear side of a sanding disk. Each row has a plurality of vertical elastic pillars. When the sanding disk oscillates, the elastic pillars share the oscillation force generated by the sanding disk and reduce the vibration transferred to the operator. Hence the operator can handle the sander easier.
Please refer to
The primary object of the present invention is to solve the problems of the conventional sanders that the edge of the sanding disk is not in close contact with a working object during oscillation, and the center portion of the elastic vertical strut coupled the sander body and sanding disk is easier fractured that result in a short lifespan.
To achieve the foregoing object the present invention provides a durable sander that includes a body with a drive motor, a sanding disk driven by the drive motor to perform sanding movement against the body and at least one oscillation buffer element. The oscillation buffer element includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and lower connection bar in an integrated manner. Each buffer portion has a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and second connection end. The elastic buffer section is formed at a length greater than a distance between the first and second connection ends.
In one embodiment the first connection ends of the buffer portions are connected to each other, and the second connection ends of the buffer portions also are connected to each other.
In another embodiment the first connection ends of the buffer portions are separated from each other, and the second connection ends of the buffer portion also are separated from each other.
In yet another embodiment the first connection end and second connection end of each buffer portion are located at a same vertical axis, and the elastic buffer section of each buffer portion includes at least one deviation section away from the vertical axis.
In yet another embodiment the elastic buffer section is formed in an arched shape.
In yet another embodiment the elastic buffer sections are mirrored about a symmetrical axis.
In yet another embodiment the oscillation buffer element includes a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axes.
In yet another embodiment the buffer portions are located on a same plane.
In yet another embodiment the elastic buffer section is formed at a width increased from the first connection end towards the second connection end.
In yet another embodiment the first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end.
In yet another embodiment the buffer portion at the outer side of the oscillation buffer element is formed at a width greater than that of the buffer portion in the center of the oscillation buffer element.
In yet another embodiment the upper connection bar and lower connection bar of the oscillation buffer element respectively include a first hole and a second hole run through by a fastening element which is screwed on the body or sanding disk. The body has a housing to hold the drive motor. The housing has a first fastening hole corresponding to the first hole and run through by the fastening element. The sanding disk has a support frame and a sanding portion fastened to the support frame. The support frame includes a second fastening hole corresponding to the second hole and run through by the fastening element.
In yet another embodiment the drive motor includes a shaft connected to the sanding disk.
In addition, the invention further provides an oscillation buffer element installed on a sander. The sander includes a body with a drive motor and a sanding disk driven by the drive motor to perform sanding movement against the body. The oscillation buffer element includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and lower connection bar. Each buffer portion has a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and second connection end. The elastic buffer section is formed at a length greater than the distance between the first and second connection ends.
The invention provides features of having an oscillation buffer element interposed between a body and a sanding disk of a sander. The oscillation buffer element has an elastic buffer section which is deformable during operation of the sander. The elastic buffer section is formed in a curved shape, hence can provide better extensibility during deformation to stabilize oscillation of the sanding disk so that the sanding disk can oscillate horizontally on the same plane. As the elastic buffer section has a longer deformation zone, it can reduce stress concentrated on various local structures in a prolonged operation period so as to extend the lifespan of the sander.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
Please refer to
In addition, referring to
Referring to
In terms of arrangement of the buffer portions 43 of the oscillation buffer element 40,
During operation of the sander, the lower half portion of the oscillation buffer element 40 usually deforms at a greater amount than the upper half portion. In order to enhance the structural strength of the oscillation buffer element 40, referring to
In short, the durable sander of the invention provides a feature with at least one oscillation buffer element interposed between the body and sanding disk. The oscillation buffer element has an elastic buffer section which can deform during operation of the sander. The elastic buffer section is formed in a curved structure to provide better extensibility during deformation to stabilize horizontal oscillation of the sanding disk on the same plane and maintain sanding quality. Comparing with the conventional vertical straight elastic strut structure, the elastic buffer section has longer deformation zone to reduce stress concentrated on local structures in prolonged operation period. As a result, overall lifespan of the sander is prolonged.
Claims
1. A durable sander, comprising:
- a body holding a drive motor inside;
- a sanding disk driven by the drive motor to perform sanding movement against the body; and
- at least one oscillation buffer element which includes an upper connection bar fastened to the body, a lower connection bar fastened to the sanding disk and a plurality of buffer portions bridging the upper connection bar and the lower connection bar in an integrated manner; each of the plurality of buffer portion including a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and the second connection end, the elastic buffer section being formed at a length greater than a distance between the first connection end and the second connection end.
2. The durable sander of claim 1, wherein the first connection ends of the buffer portions are connected to each other and the second connection ends of the buffer portions are connected to each other.
3. The durable sander of claim 1, wherein the first connection ends of the buffer portions are separated from each other and the second connection ends of the buffer portions are separated from each other.
4. The durable sander of claim 1, wherein the first connection end and the second connection end of each buffer portion are located at a same vertical axis, the elastic buffer section of each buffer portion including at least one deviation section away from the vertical axis.
5. The durable sander of claim 1, wherein the elastic buffer section is formed in an arched shape.
6. The durable sander of claim 1, wherein the elastic buffer sections are mirrored about a symmetrical axis.
7. The durable sander of claim 1, wherein the oscillation buffer element includes a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axis.
8. The durable sander of claim 1, wherein the buffer portions are located on a same plane.
9. The durable sander of claim 1, wherein the elastic buffer section is formed at a width increased from the first connection end towards the second connection end.
10. The durable sander of claim 1, wherein the first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end.
11. The durable sander of claim 1, wherein the buffer portion at an outer side of the oscillation buffer element is formed at a width greater than that of the buffer portion in the center of the oscillation buffer element.
12. The durable sander of claim 1, wherein the upper connection bar and the lower connection bar of the oscillation buffer element respectively include a first hole and a second hole run through by a fastening element which is screwed on the body or the sanding disk.
13. The durable sander of claim 12, wherein the body includes a housing to hold the drive motor, the housing including a first fastening hole corresponding to the first hole and run through by the fastening element.
14. The durable sander of claim 12, wherein the sanding disk includes a support frame and a sanding portion fastened to the support frame, the support frame including a second fastening hole corresponding to the second hole and run through by the fastening element.
15. The durable sander of claim 1, wherein the drive motor includes a shaft connected to the sanding disk.
16. An oscillation buffer element installed on a sander which includes a body with a drive motor and a sanding disk driven by the drive motor to perform sanding movement against the body, comprising:
- an upper connection bar fastened to the body;
- a lower connection bar fastened to the sanding disk; and
- a plurality of buffer portions bridging the upper connection bar and the lower connection bar in an integrated manner, each of the plurality of buffer portions including a first connection end connected to the upper connection bar, a second connection end connected to the lower connection bar and an elastic buffer section interposed between the first connection end and the second connection end, the elastic buffer section being formed at a length greater than a distance between the first connection end and the second connection end.
17. The oscillation buffer element of claim 16, wherein the first connection ends of the buffer portions are connected to each other and the second connection ends of the buffer portions are connected to each other.
18. The oscillation buffer element of claim 16, wherein the first connection ends of the buffer portions are separated from each other and the second connection ends of the buffer portions are separated from each other.
19. The oscillation buffer element of claim 16, wherein the first connection end and the second connection end of each buffer portion are located at a same vertical axis, the elastic buffer section of each buffer portion including at least one deviation section away from the vertical axis.
20. The oscillation buffer element of claim 16, wherein the elastic buffer section is formed at an arched shape.
21. The oscillation buffer element of claim 16, wherein the elastic buffer sections are mirrored about a symmetrical axis.
22. The oscillation buffer element of claim 16 further including a plurality of first elastic buffer sections and a plurality of second elastic buffer sections which are respectively mirrored about a symmetrical axis.
23. The oscillation buffer element of claim 16, wherein the buffer portions are located on a same plane.
24. The oscillation buffer element of claim 16, wherein the elastic buffer section is formed at a width increased from the first connection end towards the second connection end.
25. The oscillation buffer element of claim 16, wherein the first connection end is formed at a width smaller than that of the elastic buffer section, and the width of the elastic buffer section is smaller than that of the second connection end.
26. The oscillation buffer element of claim 16, wherein the buffer portion at an outer side is formed at a width greater than that of the buffer portion in the center.
Type: Application
Filed: Jun 18, 2013
Publication Date: Dec 18, 2014
Inventor: Bach Pangho CHEN (Claremont, CA)
Application Number: 13/920,842