JPH01321156A - Hand belt sander - Google Patents

Abstract

PURPOSE:To carry out a polishing operation with high efficiency by elastically stretching a belt sander in a triangular form with a driving roller as the apex and with each of the freely rotating rollers of a fixed rod and a swinging rod which is energized in the separating direction from the fixed rod by means of a spring. CONSTITUTION:In a hand belt sander, a roller holding portion 5a is continuously provided on the front end of a handle 1 while further providing a bracket 12 on the lower portion thereof. A driving roller 11 is fixed to the roller holding portion 5a, a first free-rotating roller 15 is provided on the end of a fixed rod 13 which is fixed to one side of the bracket 12, and a second free-rotating roller 19 is provided on the other side via a swinging rod 18, mutually being placed in a triangular form. This swinging rod 18 is swingable around a pivot 17 and a coil spring 21 engaged between pins 16, 20 acts as a toggle spring, and by putting a belt sander 9 around the rollers 11, 15, 19, as the swinging rod 18 is swung outward, the roller 19 is energized by spring so as to be separated from the roller 15, to elastically stretch the belt sander 9 in a triangular form. Hence, a highly efficient polishing operation can be carried out following a polishing curve.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a hand-held polishing tool having an endless running polishing band, and mainly relates to a polishing tool for edge finishing of wood products and metal products.

(B) Prior art A conventional hand belt sander has a rod protrudingly fixed to the top of the handle of the hand-held main body, and rotatable rollers are provided at the base of the rod and the tip of the rod, and the above-mentioned A motor is built into the handle of the main body, and the motor drives and rotates a roller at the base of the rod, and a belt sander is passed between the roller at the base and the row at the tip of the rod to polish the edges of the article. It is something that is done. This conventional general hand belt sander is shown in Figs. 2 and 3. FIG. 2 is a front view thereof, and FIG. 3 is a side view taken in the direction of arrow A in FIG.

A motor is built into the main body handle 1, and the drive roller 2 is rotated by the motor (3 is a lead wire from a power source, and 4 is a switch). The drive roller 2 is rotatably attached to a roller holding part 5 provided protruding from the top of the handle 1,
It is rotated by a roller shaft 6 driven by the motor of the handle 1. A rod-shaped belt sander holding rod 7 is provided on the roller holding portion 5 so as to project forward, and a leading roller 8 is rotatably attached to the tip of the rod. A belt sander 9 is wound around the leading roller 8 and the main roller 2. Reference numeral 10 shown in FIG. 3 is a screw for adjusting the fixing dimension of the belt sander holding rod 7 for attaching and detaching the belt sander 9. In this way, the edge portion A of the product is polished as shown in FIG.

(c) Problems with the conventional technology The conventional hand/belt sander uses the polishing method shown above (Fig. 4), that is, the belt sander 9, which is held by the main body handle 1 and protrudes straight ahead, is used to polish the edges of the product. Polishing is carried out while changing the angle according to the angle to be gripped, that is, while greatly changing the direction angle of the main body to be grasped. This work while changing the angle of the belt sander is quite difficult and requires skill.

(d) Purpose of the Invention The hand/belt cylinder does not require difficult polishing work as in the conventional type mentioned above, but it improves workability and is highly efficient, and the product can be manufactured without depending on the skill level of the operator. The purpose is to provide a hand belt sander that gives a good finish.

(E) Construction of the Invention The bells 1 to nanders are stretched in a triangular shape rather than in straight rod shapes. That is, the drive roller is set as one vertex of the triangle,
The roller provided at the tip of the fixed rod that is fixed to one side and protrudes is defined as the second apex, and the roller provided at the tip of the swinging rod that swings and protrudes depending on the usage is defined as the third apex. The swinging rod is elastically biased in a direction away from the fixed rod, and a belt sander is passed around the three rollers to create a gap between the roller on the fixed rod and the roller on the swinging rod. The polishing operation is performed using a belt sander, that is, a belt sander on the opposite side of the drive roller.

Embodiment An embodiment of the hand belt sander according to the present invention is shown in FIG. 1 on the same side as that shown in FIG. 2 above. That is, a roller holding part 5a is formed protrudingly in front of the handle 1, and a rotating device driven by a motor built into the main body is provided on one side (the back side in the figure) of the roller holding part 5a, and the drive roller 11 rotated by this or the opposite side thereof is provided. (
(front side in the figure). The roller holding part 5a further has a bracket 12 hanging downwardly, and a fixing rod 13 is attached to the fixing pin 1 at one of the lower two corners of the lower bracket 12.
Fixed at 4. The fixing pin 14 is located at the midpoint of the fixing rod 13, an idling roller 15 is attached to the tip of the fixing rod 13, and a spring pin 16 is installed at the base (the center of the bracket 12). . A pivot 17 is provided at the lower part of the bracket 12 on the usage side, and a swinging rod 18 is swingably attached to the pivot 17. A second idling roller 19 is attached to the tip of the oscillating rod 18, and a pin 2o is installed inside the second idling roller 19 on the oscillating rod 18.
A coil spring 21 is hooked to the pin 20 and the spring pin 16 of the fixed rod 13. A belt sander 9 is stretched around the drive roller 11, idle roller 15, and second idle roller 19. When tensioning the belt sander 9, the swinging rod 18 is swung toward the fixed rod 13 to engage the belt sander 9, and the swinging rod 18 is set at an angle larger than a right angle to the fixed rod 13 (contrary to the figure). (clockwise). That is, the coil spring 21 is caused to perform a toggle spring action. The relationship between the fixed rod 13 and the swing rod 18 is such that in the rotational direction of the drive roller 11, the idle roller 15 of the fixed rod is on the upper side, that is, the belt sander 9 is rotated counterclockwise in FIG. It is better to be treated as such. With this structure, when the edges of an article are polished using the hand belt sander according to this embodiment, the process is as shown in FIG. 5. If the belt sander 9 between the second idling roller 19 of the swinging rod 18 and the idling roller 15 of the fixed rod 13 is pressed against the polishing part of the article to be polished and the motor is driven, the belt sander 9 will move to the polishing part. A is strongly pressed and slides, and at this time, the swinging rod 18 is pressed against the coil spring 2.
1 determines the swinging direction of the belt cylinder (clockwise in the diagram)
Since the hand/belt sander is elastically biased, the operator does not need to apply any force when polishing with this hand/belt sander.
If you hold the triangular belt sander 9 and apply the belt sander on the opposite side of the drive roller to the sanding area, the belt sander will be curved at the sanding area as shown in Figure 5, and the sanding area will be curved and sanded. (Figure 5 shows a hand/belt sander with the mounting position of the drive roller 11 opposite to the main body handle 1 shown in Figure 1, that is, the fixing rod 1.
3 and the swinging rod 18 are shown in reverse order, but their functions are the same).

In the embodiment, the coil spring 21 is made to perform a toggle spring action, but of course the spring pin 16 is connected to the swinging rod 18.
Alternatively, the swinging rod 18 may be biased toward the outside (to the right in the figure) in the counterclockwise direction in the figure.

(g) Effects of the Invention As described above, according to the hand belt sander of the present invention, the belt sander is elastically stretched in a triangular shape with the driving roller as one vertex, so that the corresponding belt sander on the opposite side of the driving roller Just by touching the center part to the polishing area, the belt sander of the polishing part will curve to follow the polishing curved surface due to the weight of the main body without applying any special force, and the belt sander can be used in a short time without the need for various polishing operations or polishing techniques. This is a highly efficient belt sander that can get a clean finish in a short amount of time.

[Brief explanation of the drawing]

Figure 1 is an embodiment of the hand belt sander according to the present invention, Figures 2 and 3 are conventional hand belt sanders, Figure 2 is a front view thereof, and Figure 3 is a side view taken in the direction of arrow A. be. Fig. 4 shows the state of polishing the edge of a product with the conventional hand/belt sander shown in Fig. 2, and Fig. 5 shows the working state of the hand/belt sander according to the embodiment of the present invention. It is. 1... Main body handle, 5a... Roller holding part. 9... Belt sander, 11... Drive roller. 12...Bracket, 13...Fixing rod. 15... First idle roller, 18... Swinging rod. 19...Second idle rotation O-ra. Applicant Hagiwara Seisakusho Co., Ltd. 1 Figure 2 Figure 3 Figure 3

Claims (1)

[Claims] In a hand belt sander, a holding part 5a for a roller 11 that is rotationally driven by the motor is provided at the top of the handle 1 that has a built-in motor, and the belt sander 9 is rotated by the driving roller 11.
A bracket 12 is fixedly protruded from the bracket 12, and the bracket 12 is provided with a fixed rod 13 having a first idling roller 15 at its tip and a swinging rod 18 having a second idling roller 19 at its tip. and the first idle roller 15 and the second
The idling rollers 19 are configured to form the vertices of a triangle, and the belt sander 9 is wound around the three rollers (drive roller 11, first idling roller 15, and second idling roller 19). The second idling roller 19 is the first idling roller 15.
A hand belt sander characterized by being elastically biased in a direction away from the body.