1. Field of the Invention
The present invention relates to a sand-belt finishing machine, and more particularly to a sand-belt finishing machine having a lift device that can be operated easily and conveniently, thereby facilitating the user operating the lift device.
2. Description of the Related Art
A conventional sand-belt finishing machine comprises two rollers, and a sand belt reeved around the two rollers for grinding a workpiece, such as a wooden board, placed on a conveyor platform. However, the thickness of the wooden board is not a constant, so that it is necessary to adjust the position of the conveyor platform so as to change the distance between the conveyor platform and the sand belt.
The primary objective of the present invention is to provide a sand-belt finishing machine having a lift device that can be operated rapidly, easily and conveniently, thereby facilitating the user operating the lift device.
Another objective of the present invention is to provide a sand-belt finishing machine having a lift device that has a simplified construction, thereby decreasing costs of fabrication.
A further objective of the present invention is to provide a sand-belt finishing machine, wherein the distance between the grinding devices and the conveyor platform can be adjusted arbitrarily by the lift device, so that the grinding devices can be used to grind workpieces of different thickness.
In accordance with the present invention, there is provided a sand-belt finishing machine, comprising:
Further benefits and advantages of the present invention will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings.
Referring to the drawings and initially to
The lift device “A” includes a propeller shaft 22 mounted in the main frame 10 and having a first end provided with a beveled gear 26 and a second end protruded outward from the main frame 10, and an operation handle 24 mounted on the main frame 10 and secured on the second end of the propeller shaft 22 for rotating the propeller shaft 22. Preferably, the beveled gear 26 is fixed on the first end of the propeller shaft 22.
The lift device “A” further includes a shaft 28 having a first end secured on a bottom face of the conveyor platform 18 and a second end extended through the main frame 10. Thus, the shaft 28 can be moved relative to the main frame 10.
The lift device “A” further includes a support plate 32 having a first end secured on the second end of the shaft 28 and a second end provided with a threaded sleeve 34. Preferably, the threaded sleeve 34 is fixed on the second end of the support plate 32 and has an inside formed with a screw bore 35.
The lift device “A” further includes a driving rod 36 engaged in the screw bore 35 of the threaded sleeve 34 and having a distal end provided with a beveled gear 38 meshing with the beveled gear 26 of the propeller shaft 22. The driving rod 36 is extended through the support plate 32. Preferably, the driving rod 36 has a periphery formed with an outer thread 360 screwed into the screw bore 35 of the threaded sleeve 34. In addition, the beveled gear 38 is fixed on the distal end of the driving rod 36.
The lift device “A” further includes a slide rod 42 having a first end secured on the bottom face of the conveyor platform 18 and a second end extended through the main frame 10. Preferably, the slide rod 42 is in parallel with the shaft 28. In addition, the slide rod 42 can be moved relative to the main frame 10.
Thus, the shaft 28 has a first end secured on the bottom face of the conveyor platform 18 and a second end extended through the main frame 10, and the slide rod 42 has a first end secured on the bottom face of the conveyor platform 18 and a second end extended through the main frame 10, so that the conveyor platform 18 is limited by the shaft 28 and the slide rod 42 without rotation.
In operation, referring to
Thus, the conveyor platform 18 can be moved upward as shown in
Alternatively, the conveyor platform 18 can be moved downward as shown in
Although the invention has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.
Number | Name | Date | Kind |
---|---|---|---|
3132451 | Kile | May 1964 | A |
3394501 | Carlson et al. | Jul 1968 | A |
3603041 | McDonald | Sep 1971 | A |
4258506 | Robinson | Mar 1981 | A |
4556471 | Bergman et al. | Dec 1985 | A |
4719721 | Stump | Jan 1988 | A |
5133156 | Arms et al. | Jul 1992 | A |
6044960 | Cloud et al. | Apr 2000 | A |
6405769 | Labrie | Jun 2002 | B1 |