BRIEF DESCRIPTION OF DRAWINGS
This invention will be better understood by referring to the accompanying drawings, wherein:
FIG. 1 is a perspective view of a conventional circular saw;
FIG. 2 is a partial perspective view of the conventional circular saw;
FIG. 3 is a perspective view of a table saw provided with a circular saw elevating and lowering device in the present invention;
FIG. 4 is an exploded perspective view of a circular saw elevating and lowering device and relative components for a table saw in the present invention;
FIG. 5 is a side view of the circular saw elevating and lowering device and the relative components for a table saw in the present invention;
FIG. 6 is a rear view of the circular saw elevating and lowering device with the relative components for a table saw in the present invention;
FIG. 7 is a side view of the circular saw elevating and lowering device with the relative components in the present invention, with the device being under elevating condition; and,
FIG. 8 is a cross-sectional view of a main rod in the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
A preferred embodiment of a circular-saw elevating and lowering device 4 for a table saw, as shown in FIGS. 3, 4, 5 and 6, includes a main rod 40, a worm 50, a slide rod 60 and a moving up and down block 70. The table saw includes a base 20, a saw base 30 pivotally connected in the base 20, an upper fixing member 31, a lower fixing member, and a circular saw unit 33.
The main rod 40 is composed of an elongate rod 41 and a circular handle 42 as shown in FIG. 8, and the elongate rod 41 has its front end extending out of the base 20, a threaded front end portion 412, a fitting portion 411 just behind the threaded front end 411, and a sleeve 413 fitting around the portion at an outer side of the saw base 30 and the fitting portion 412. The rear end of the elongate rod 41 supported in the position hole 322 of the lower fixing member 321 is fixed with a main bevel gear 414. The circular handle 42 has a center hole 421 fitting tightly around the fitting portion 411 so the elongate rod 41 can be rotated by the circular handle 42. Further a tightening button 422 is threadably combined with the threaded end portion 412.
The worm 50 has two ends pivotally connected respectively with the upper fixing base 31 and the lower fixing base 30, located vertical to the main rod 40, and its lower end fixed with a subordinate gear 51, which then engages with the main bevel gear 414.
The slide rod 60 is positioned in parallel to the worm 50 and also between the upper and the lower fixing base 31 and 32
The moving up-and-down block 70 is provided with a threaded hole 71 for the worm 50 to engage and a through hole 72 for the slide rod 60 to pass through. Further a separating plate 73, located a little up behind the circular saw unit 33, is fixed on one side of the moving up-and-down block 70, and the circular saw unit 33 is pivotally connected to the front end of the moving up-and-down block 70.
Next, referring to FIGS. 5 and 7, when the circular saw unit 33 is to be adjusted for the thickness of a work to be sawed, the circular handle 42 of the main rod 40 is to be rotated manually to rotate the main bevel gear 414, which then rotates the subordinate bevel gear 51 so that the moving up-and-down block 70 may be moved up or down by the distance caused by the rotation of the worm 50, elevating or lowering both the circular saw unit 33 and the separating plate 73 synchronously. Thus the gap between the circular saw unit 33 and the separating plate 73 is kept always the same, avoiding potential risk of the gap expanded to let the hands of a user hurt by the circular saw rotating by touching the circular saw 33.
In addition, it is worth to mention that after the main rod 40 is finished in adjustment, in order to avoid the circular handle 42 from rotated by some external force, the tightening button 422 can be rotated to let the circular handle 42 tightened by both the sleeve 413 and the tightening button 422, as shown in FIG. 8.
Lastly, the advantages of the invention are described as follows.
- 1. The circular saw elevating and lowering device can permit both the circular saw and the separating plate synchronously move up and down so the gap between the both can be maintained always the same, avoiding a user from hurt by the circular saw unit in sawing process and upgrading the safety in operating the table saw.
- 2. The circular saw elevating and lowering device has the circular handle fixed on the main rod, which can be controlled by the tightening button to be kept immovable, beefing up its fixedness for increasing convenience of assemblage and maintenance of the table saw.
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.
Patent Application
20080083313
