Retainer assembly for circular saw blades

Abstract

Various embodiments of the present invention provide a holder assembly (100) for a circular saw tool. The holder assembly (100) for a circular saw tool includes a blade (116) having a hole. The blade (116) can be mounted to a rotatable shaft (102) or a free end of the tool through the hole. The blade (116) is also adapted to be held between an inner flange (106) and an outer flange (110) on the shaft (102) in a compression manner. The holder assembly (100) is characterized by at least one recess (104) formed on a circumferential surface of the free end of the shaft (102) and at least one clutch member (108) (or a collet), the at least one recess (104) being formed on a circumferential surface of the free end of the shaft (102), the at least one clutch member (108) (or a collet) being matched with and mounted around the at least one recess (104) and being located between the hole of the blade (116) and the shaft (102). The holder assembly (100) provides an improved grip while providing safety or emergency braking.

Description

Technical Field

[0001] The present invention relates to a holder assembly for a circular saw tool. Background Art

[0002] According to the prior art US 2010 / 0040474, a fixing device for a rotating blade is provided. The fixing device for fixing the rotating blade to the main shaft in a table circular saw, for example, has a structure that is difficult to achieve structural compactness of the radial dimension. Therefore, there is a problem of sacrificing the inclination angle and cutting depth of the rotating blade. A fixing device is provided that does not have these problems due to the use of a structure that can be easily compacted in the radial direction. Cam segments are arranged on corresponding surfaces of the middle flange and the outer flange that are opposite to each other so as to engage with each other. The cam segments slide together with each other by the rotational force applied to the rotating blade, so that the rotational force is converted into a displacement in the direction of the axis of the middle flange and is applied in the direction of clamping the rotating blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0003] An embodiment of the present disclosure is described with reference to the following drawings:

[0004] Figure 1 illustrates a side cross-sectional view of a retainer assembly according to one embodiment of the present invention;

[0005] Figure 2 illustrates an exploded view of a holder assembly for a circular saw tool according to one embodiment of the present invention;

[0006] Figure 3 illustrates a detailed view of the free end of a shaft according to one embodiment of the present invention; and

[0007] Figure 4 A front cross-sectional view of a retainer assembly according to one embodiment of the present invention is illustrated. DETAILED DESCRIPTION

[0008] Figure 1A side cross-sectional view of a holder assembly according to one embodiment of the present invention is illustrated. The holder assembly 100 for a circular saw tool includes a blade 116 having a hole. The blade 116 can be mounted to the free end of a rotatable shaft 102 or a spindle of the tool through the hole. The blade 116 is also adapted to be held between an inner flange 106 and an outer flange 110 on the shaft 102 in a compression manner. The holder assembly 100 is characterized by at least one recess 104 formed on the circumferential surface of the free end of the shaft 102 and at least one clutch member 108 (or dog) mated with and mounted around the at least one recess 104 and located between the hole of the blade 116 and the shaft 102. The recess 104 may also be referred to as a profile.

[0009] The blade 116 is mounted on at least one clutch member 108 and then retained between the inner flange 106 and the outer flange 110 by means of washers 112 and bolts 114 .

[0010] At least one clutch member 108 is adapted to brake the rotation of the blade 116 in an emergency situation. One of the emergency situations may be the presence of a body part of a human operator near or in contact with the rotating blade 116. Braking or stopping the rotation of the shaft 102 in an emergency situation is performed by a separate device or system known in the art.

[0011] Figure 2 The figure shows an exploded view of a retainer assembly for a circular saw tool according to one embodiment of the present invention. The at least one clutch member 108 includes two clutch members 108, which are paired with and mounted around the corresponding two recesses 104. At least two restraining elements 402 ( Figure 4 102) is adapted to connect and retain the two clutch members 108 to the shaft 102. The restraining element 402 is selected from the group consisting of a leaf spring and a torsion spring. The restraining element 402 is optional.

[0012] According to another embodiment of the present invention, the at least one clutch member 108 includes three clutch members 108, and the three clutch members 108 are matched with and installed around the corresponding three recesses 104, such as Figure 2 In addition, at least three constraining elements 402 are adapted to connect and retain the three clutch members 108 to the shaft 102. The constraining elements 402 are selected from the group consisting of leaf springs and torsion springs. The constraining elements 402 are optional.

[0013] In addition, the inner flange 106 includes at least one protrusion 202, which serves as a guide to position the at least one clutch member 108. The guide helps to place the at least one clutch member 108 in a mating manner. Figure 2In FIG. 2 , the three clutch members 108 are arranged between the three protrusions 202 .

[0014] Figure 3 A detailed view of the free end of a shaft according to one embodiment of the present invention is illustrated. Recesses 104 for mounting clutch members 108 are shown. The number of recesses 104 is equal to the number of clutch members 108 used. The recesses 104 are in the form of a curve with a decreasing radius. Similarly, at least one clutch member 108 is designed so that when mated with the recess 104, the circumference of at least one clutch member 108 forms a circle. The shaft 102 includes an axial hole to receive a bolt 114 for secure attachment.

[0015] The circular saw tool is selected from the group consisting of a tabletop tool, a portable tool, a handheld tool, a plunge tool, etc. In one embodiment, the holder assembly 100 is retrofitted to an existing circular saw tool.

[0016] Figure 4 A front cross-sectional view of a retainer assembly according to one embodiment of the present invention is illustrated. At least one clutch member 108 is in the form of a sector of a circle with a varying radius to facilitate matching with the recess 104. The three clutch members 108 are retained by three restraining elements 402.

[0017] The operation of the retainer assembly according to the present invention is disclosed. When the circular saw tool is in operation, the entire retainer assembly 100 rotates. When the shaft 102 is suddenly stopped by an external mechanism called a brake, the blade 116 tends to rotate due to inertia while it is held in place by the inner flange 106 and the outer flange 110. Due to the inertia of the blade 116, the subassembly of the blade 116, the inner flange 106 and the clutch member 108 tends to rotate. When the clutch member 108 rotates on the shaft 102 due to the motion input from the inner flange 106, the clutch member 108 tends to move radially outward and grip the inner surface of the blade 116 by a harder gripping force when the blade 116 tends to rotate further. When the clutch member 108 moves on the recess 104 or contour of the shaft 102, the grip is enhanced. Therefore, the mechanism converts the moment of inertia of the blade 116 into a higher grip of the blade 116 during deceleration. As the blade 116 stops, the gripping force tends to decrease while the clutch member 108 is held in place by the restraining element 402 .

[0018] According to one embodiment of the present invention, the retainer assembly 100 provides an improved grip while providing a safety or emergency brake with easy access to the blade 116, and also reduces the workload of replacing the blade 116. In addition, the installation and removal torque required for the blade 116 is within normal human limits. The retainer assembly 100 enhances the safety brake mechanism by firmly gripping the blade 116 in the event of a brake. Moreover, because the rotation of the blade 116 is immediately stopped, the temperature of the blade 116 does not increase.

[0019] It should be understood that the embodiments explained in the above description are illustrative only and do not limit the scope of the invention. Many such embodiments and other modifications and variations in the embodiments explained in the description are contemplated. The scope of the invention is limited only by the scope of the claims.

Claims

1. A holder assembly (100) for a circular saw tool, the tool comprising: a blade (116) having a hole through which the blade (116) can be mounted to the free end of the rotatable shaft (102) of the cutter, the blade (116) being further adapted to be held in a compressive manner between the inner flange (106) and the outer flange (110) on the shaft (102), Features at least one recess (104) formed on a circumferential surface of the free end of the shaft (102), and at least one clutch member (108) mated with and mounted about the at least one recess (104) and located between the aperture of the blade (116) and the shaft (102), wherein the at least one clutch member (108) is adapted to brake the rotation of the blade (116) in an emergency situation, and The at least one recess (104) is in the form of a curve with a decreasing radius, and the at least one clutch member (108) is in the form of a sector of a circle with a varying radius so as to match the at least one recess (104).

2. The retainer assembly (100) of claim 1, wherein: The at least one clutch member (108) includes two clutch members (108) mated with and mounted around the two recesses (104).

3. The retainer assembly (100) of claim 2, wherein: At least two restraining elements (402) are adapted to connect and retain the two clutch members (108) to the shaft (102).

4. The holder assembly (100) of claim 3, wherein: The restraining element (402) is selected from the group consisting of a leaf spring and a torsion spring.

5. The retainer assembly (100) of claim 1, wherein: The at least one clutch member (108) includes three clutch members (108) mated with and mounted around the three recesses (104).

6. The holder assembly (100) of claim 5, wherein: At least three restraining elements (402) are adapted to connect and retain the three clutch members (108) to the shaft (102).

7. The holder assembly (100) of claim 6, wherein: The restraining element (402) is selected from the group consisting of a leaf spring and a torsion spring.

8. The retainer assembly (100) of claim 1, wherein: The circular saw tool is selected from the group consisting of a desktop tool, a portable tool, a handheld tool, and an insert tool.

9. The holder assembly (100) of claim 1, the holder assembly (100) being retrofitted to an existing circular saw cutter.

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