JP2002254238A - Fence assembly for combined circular saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fence assembly for a combined circular saw having an oblique saw blade relative to a horizontal working plane. SOLUTION: A first fence part 34 can be mounted on the saw on a first side of a saw blade. A second fence part 36 can be mounted on the saw on a side opposite to the saw blade, and the saw is inclined in that direction. The second fence part is composed of a fixing part 38 mounted on a table surface, and an adjustment part 40 mounted on the fixing part and adjustable for approaching or leaving the saw blade in the lateral direction. A workpiece is supported at the nearest position to the saw blade when the blade is in a vertical position, and at the same time, in order to offer an enough clearance at a maximum angle of the saw blade gradient, the adjustment part 40 is allowed to move outward. Scales are set at the fixing part and the adjusting part of the second fence part, and display innermost positions in various oblique angles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular saw, and more particularly to a fence for a composite circular saw.

[0002]

2. Description of the Related Art In general, a fixed rotary arm type and a movable type circular saw cooperate with each other to form a horizontal table surface in cooperation with a rotary table, left and right fixed table portions, and a vertical direction from a rear end of the table surface. It has a stationary fence extending upward. The workpiece to be cut is supported and / or clamped against a horizontal table and fence so that the workpiece is stabilized during the cutting operation. Fences for circular saws typically have a central opening coincident with the rotary saw blade and upright support surfaces on both sides of the saw blade. In order to keep the left and right fences on the same plane, the left and right fences are connected by a low-height C-shaped part provided at a sufficient distance behind the back end of the saw blade to prevent interference. In many cases, it is formed of a casting having an integrated structure.

When a user wants to change the miter cutting angle, the turntable and saw blade are pivoted about a generally orthogonal axis. To perform a compound angle miter cut, the saw blade and motor arm assembly are tilted with respect to a horizontal axis along the plane of the turntable. Typically, the saw blade can be adjusted counterclockwise to a 45 ° position from a vertical position as viewed from the front of the circular saw. In order to accommodate the movement of the saw blade, make sure that the left fence does not interfere with the saw blade or protective guard housing when using the saw at the maximum inclination angle.
The left fence must be well cut out.
Ironically, if the saw is used with the saw blade perpendicular to the table or at a "zero" slope, especially when cutting short and long workpieces, the cut-out left fence portion will provide the desired support for the material. Can not provide. In the past, in order to solve this problem, a certain user, for example, has a thickness of 1
A temporary extension fence, such as a 1/2 inch hardwood board, was installed. These extension fences can be high and can extend inward toward the saw blade to the greatest extent not interfering with the saw blade or guard moving to a zero tilt angle position. If the saw blade needs to be tilted, the extension fence must be removed so that the saw blade and motor arm assembly is tilted.

[0004] In an attempt to maximize fence coverage and support for the workpiece, attempts have been made to create fences that are movable by the user. To maximize workpiece support while preventing interference, the movable fence must be positioned by trial and error, typically by moving the fence inward while holding the saw blade in a depressed position. I had to. Simply visually positioning the fence causes interference between the saw blade guard and the fence during cutting, which in turn requires unclamping, fence adjustment, re-clamping, and cutting work on the workpiece, which is inevitable. Incomplete cutting of the workpiece.

[0005]

SUMMARY OF THE INVENTION The present invention seeks to maximize the support of a saw assembly at various angles of inclination.
It is intended to provide a movable fence that can change the position of the fence inward.

[0006]

SUMMARY OF THE INVENTION Accordingly, a composite circular saw includes a fence assembly having left and right fence portions extending on opposite sides of the tiltable saw assembly. At least one of the fence assemblies includes a laterally moving adjustment that approaches or separates from the saw blade. In various positions that provide clearance between the saw blade and the fence assembly in order to maximize the support of the workpiece in the area proximate to the saw blade, the adjustment unit is a fixed part of the fence assembly provided on the table Can be attached to Scales are provided on the fixed and movable fence sections to provide an indication of the maximum inboard position at various angles of inclination.

[0007]

1 and 2 show a first composite circular saw 10 embodying the present invention. The compound circular saw 10 includes a fixed base 12 and a rotary table 14 that rotates about a vertical axis with respect to the fixed base 12. The fixed base 12 and the turntable 14 cooperate to form the illustrated horizontal support surface. Rotating table 1 fixed to fixed base 12
The fence assembly 16 straddling the 4 provides a horizontal support surface perpendicular to the horizontal table surface of the fixed base 12 and the rotary table 14. The horizontal table surface and the vertical fence support surface cooperate to support the workpiece as the workpiece is cut with a compound circular saw. The composite circular saw further includes a swivel arm rotary saw assembly 18 that operates in a conventional manner. The arm assembly has a fixed end 20 pivotally connected to the turntable 14 and a distal end terminating in a handle 22. Between the fixed end and the distal end of the rotary saw assembly 18 is a rotary saw blade 24 and a suitable guard 26
And is driven by a conventional motor assembly 28.

In use, the saw in the position shown in FIG. 1 is pivotable downward about a fixed end 20 and a rotating saw blade 24 for making a normal right angle cut to a workpiece.
Passes through a workpiece supported on a horizontal table surface,
Slot 3 until the workpiece is completely cut in two
Continue cutting through 0. In order to perform the miter angle cutting, the table lock 32 is released,
The entire saw blade 24 and the rotary saw assembly 18 are rotatable with respect to the fence assembly 16. Alternatively, a simple miter angle cut can be made by tilting the saw blade as illustrated by the circular saw in the position shown in FIG. 2, where the arm assembly and saw blade are rotated, It is then locked at a selective angle about a generally horizontal axis parallel to the turntable 14 and the slot 30 formed therein. When performing a compound miter angle cut, in addition to tilting the saw blade relative to the table surface as shown in FIG. It is positioned as follows.

When the saw blade is tilted counterclockwise to the left as viewed from the front, as shown in FIG. 2, the saw blade provides clearance for the saw blade 24 and the guard 26 surrounding it. A suitable notch must be provided in the fence on the left side of the blade 24. Conventional fence assemblies are notched to provide clearance for the saw blade and the guard surrounding it at a maximum tilt angle throughout the range of table rotation. Thus, the left fence is often smaller and cannot provide the support desired when cutting short and long workpieces. To solve this problem, the fence assembly 1
Reference numeral 6 denotes a fixed first fence portion 34 provided on the right side of the table surface and a second fence portion 36 provided on the left side of the table surface. The second fence portion 36 includes a fixing portion 38 attached to the horizontal table surface of the base 12.
And an adjustment portion 40 slidably mounted on the fixed portion 38 for lateral movement toward or away from the saw blade 24. In the example of FIG.
0 is moved in the direction of the saw blade 24 and is locked at a position where the short and long work pieces are maximally supported. If it is desired to incline the saw blade 24 by 45 ° as shown in FIG. 2, the adjustment 40 is moved away from the saw blade and provides sufficient space for the saw blade 24 and the guard assembly 26 surrounding it. Locked in position to provide clearance.

Another embodiment of the present invention is shown in FIGS. 3 and 4, and details of the adjustment fence assembly are shown in FIGS. The composite circular saw 50 shown in FIGS.
Works similarly to the circular saw 10 described with reference to FIGS. 1 and 2, mainly with differences in design choices. Similarly, the composite circular saw 50 includes a first fence portion 54 and a second fence portion 56 serving as a fixing portion 58 and an adjusting portion 60.
And an adjustment fence assembly 52 composed of: The fixing portion 58 and the adjustment portion 60 of the second fence portion 56 cooperate to form a flat vertical fence surface that is generally coplanar with the corresponding support plane associated with the first fence portion 54 on the right side of the saw blade 62. It is formed on the left side of the rotary saw blade 62.

An enlarged front view of the fence assembly removed from the circular saw is shown in FIG. Adjustment section 60 preferably includes a high handle area 64 at its upper end to be gripped by a user. The adjusting section 60 is slidable with respect to the fixed section 58. In the embodiment shown, this sliding connection is achieved by tongues and grooves. Ridge 6
6 is provided in the adjustment part 60, and the groove 68 (best seen in FIG. 9) is provided in the fixing part 58. Ideally,
The rear side of the ridge 66 is provided with a groove 70 through which the end of the bolt portion of the fixing knob 72 extends. The fixing knob 72 is provided with an opening 74 provided in the fixing portion 58 of the second fence 56 as shown in FIG.
And a threaded bolt portion which is screwed with the bolt.

The user adjusts the fixing part 58 with respect to the adjusting part 60 of the second fence part 56 by loosening or retightening the fixing knob by grasping the knob part of the fixing knob 72 just in a good condition. Assists in dotting and re-fixing. Of course, other sliding coupling members or other types of locking mechanisms may be used instead, such as bolts corresponding to through slots through one of the fixed or adjustable fence portions, or other types of linear guides, for example. be able to.
Further, although only one locking knob is shown, multiple locking knobs or additional screws or structures may be added to connect the locking and adjusting portions of the second fence portion.

In order to keep the second fence at a right angle to the table, the adjusting portion and the fixing portion of the second fence forming the plane are machined surfaces. Ideally, at least a portion of the sliding contact surface between the fixed fence and the adjustment fence is similarly machined so that the fixed fence and the adjustment fence coincide in the same plane. Preferably, as is known in the art, the first fence portion 54 and the second fence portion 56 are suitably matched by integrally forming the fence portions from a common casting as shown in FIG. I'm dripping. The fixed portions 58 of the first fence portion 54 and the second fence portion 56 are connected by a generally C-shaped curved portion 76. The bend 76 extends far enough behind the saw blade at the largest cutting edge to provide a saw blade clearance and has a sufficient cross-section to provide rigidity to the fence assembly 52. Fence assembly 52 has opening 7
8 and attached to the base 12 of the circular saw 50 in the usual manner using bolts through the fence assembly 52.

When the user adjusts the adjusting portion 6 of the second fence portion 56,
In order to facilitate the positioning of the second fence portion 56, as shown in FIGS.
Are provided in the fixing portion 58 and the adjusting portion 60. FIG.
In the embodiment of the invention illustrated in FIG.
6 is provided with a pointer 80 cast on the surface of the fixing part 58 as shown. Corresponding pointer marker 8
2, 84, 86 are provided in the adjustment unit 60. The pointer marker 82 has a "zero" indication that indicates that the marker 82 should coincide with the pointer 80 when the saw blade is at the "zero" tilt angle. As the saw blade tilt increases, the adjustment portion 60 of the second fence portion 56 moves to the left, so that the user can adjust the adjustment portion 60 of the second fence portion 56 to various saw blade tilt angles. 15 °, 30 °, and 45 ° to assist in positioning at
Other markers 84, 86 and 88 with indicia
Is provided.

On the other hand, as shown in FIG.
The pointer 90 may be provided in the adjustment unit 60 of the second fence part 56, and the marker 9 as a corresponding mark may be provided.
2 may be provided on the fixing portion 58. The illustrated preferred embodiment of the invention is only one example of how the invention may be implemented in a compound circular saw. Alternatively, the fences of the present invention may be used in a sliding composite circular saw, and may be applied to both left and right fences of a circular saw that can tilt to both sides.

While embodiments of the invention have been illustrated and described, it is not intended that these embodiments illustrate and describe all forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is to be understood that various changes may be made without departing from the spirit and scope of the invention.

[0017]

As described above, according to the sliding fence of the composite circular saw according to the present invention, the position of the fence is moved in accordance with the inclination angle of the saw blade, so that the fence portion and the saw blade or the protection fence are protected. The circular saw can be used while preventing interference with the guard housing and maximally supporting the workpiece.

[Brief description of the drawings]

FIG. 1 is a front perspective view of a circular saw with a fence of the present invention at a saw blade tilt angle position “zero”.

FIG. 2 is a diagram showing the circular saw of FIG. 1 in which the saw blade is inclined by 45 °;

FIG. 3 is a front perspective view showing a circular saw according to another embodiment.

FIG. 4 is a left 45 ° perspective view of the circular saw in FIG. 3;

FIG. 5 is a front view of the movable fence assembly used in the circular saw of FIG. 3 with the fence in the tilt angle position “zero”.

FIG. 6 is a partially enlarged view of the movable fence of FIG. 5 provided with a fence at a tilt angle position of 15 °.

FIG. 7 is a partially enlarged view of the movable fence of FIG. 5 provided with a fence at a tilt angle position of 30 °.

FIG. 8 is a rear view of the movable fence of FIG. 5;

FIG. 9 is an exploded perspective view of the back surface of the movable fence.

FIG. 10 is a front view of a scale according to another embodiment, and is a front view corresponding to the adjustment fence portion of FIG. 7;

[Explanation of symbols]

 10, 50 Composite circular saw 12 Fixed base 14 Rotary table 16 Fence assembly 18 Rotary saw assembly 20 Arm assembly fixed end 22 Handle 24, 62 Saw blade 34, 54 First fence portion 36, 56 Second fence portion 38, 58 Fixed portion 40 , 60 adjusting unit 66 convex edge 68 groove 80, 90 pointer 82, 84, 86, 88, 92 pointer marker

 ──────────────────────────────────────────────────の Continued on front page (72) Kenneth M. Inventor. Brazel United States South Carolina 29673 Piedmont Kingsland 121 F-term (reference) 3C040 CC03 GG18 GG41

Claims (12)

[Claims] 1. A first fence portion attachable to the composite circular saw on a first side of the angled saw blade and extending upwardly and generally perpendicular to a horizontal table surface, and a second fence portion of the saw blade. On the side of the composite circular saw, extending upwardly and generally vertically to the horizontal table surface, close to or away from the fixed portion attached to the horizontal table surface and the saw blade. A second fence portion comprising an adjustment portion slidably attached to the fixed portion for lateral movement to move; a pointer formed on one of the fixed portion and the adjustment portion; A scale having a series of indicia formed on one of the blades to provide a user with a visual indication of the exact position of the adjustment section corresponding to the angle of inclination of the saw blade. The vertical direction from the second fence part When tilted in the direction, the adjustment portion of the second fence portion is movable outwardly to provide clearance for the saw blade, and when the saw blade returns to the vertical position, The compound circle wherein the adjuster is movable in the direction of the saw blade to provide additional support for the workpiece to be supported while the workpiece is cut by the saw blade. Fence assembly for sawing. 2. The fence assembly according to claim 1, wherein the fixing portions of the first fence portion and the second fence portion are integrally formed, and are connected by a curved portion. 3. The fence assembly according to claim 1, further comprising a lock mechanism for fixing the adjustment portion and the fixing portion of the second fence portion. 4. The fence assembly according to claim 1, wherein the fixing portion and the adjusting portion of the second fence portion are connected to each other by a tongue and a groove. 5. The device according to claim 4, wherein the groove is formed in the fixing portion of the second fence portion, and the convex edge is formed in the adjustment portion of the second fence portion. Fence assembly. 6. The fence assembly according to claim 5, further comprising a lock member that connects the adjustment part and the fixing part of the second fence part. 7. A base having a generally planar horizontal table surface, a fixed end pivotally connected to the base, a distal end forming a handle, and a table surface as the arm pivots about the fixed end. And an intermediate portion that supports a rotary saw blade that moves in a direction approaching or away from the table surface to cut the workpiece placed on the
An arm assembly wherein the arm is further adjustable in inclination with respect to the base so as to incline the saw blade from a direction perpendicular to the table surface in order to perform a tilt angle cutting; and A first fence provided on a first side of the saw blade for forming a flat fence surface for supporting the workpiece and extending vertically upward with respect to the horizontal table surface; And a portion provided on a second side of the saw blade that moves in that direction when tilted from a vertical direction, for a lateral movement approaching or away from the fixed part attached to the base and the saw blade. A fence assembly comprising: a second fence portion comprising an adjustment portion slidably attached to the fixing portion; A pointer formed on one of the sections and a series of indices formed on the other of the fixing section and the adjusting section of the second fence portion, corresponding to a user with the inclination angle of the saw blade. And a scale that provides a visual indication of the exact position of the adjustment portion, wherein the adjustment portion of the second fence portion is adjusted when the saw blade is tilted from the vertical direction toward the second fence portion. The adjustment portion of the second fence portion is movable outwardly to provide clearance for the saw blade, and when the saw blade returns to a vertical position, the adjustment portion for the workpiece to be cut. A circular saw which is movable in the direction of the saw blade to provide support. 8. The circular saw according to claim 7, wherein the fixing portions of the first fence portion and the second fence portion are integrally formed and connected by a curved portion. 9. The circular saw according to claim 7, further comprising a lock mechanism for fixing the adjusting portion and the fixing portion of the second fence portion. 10. The circular saw according to claim 7, wherein the fixing portion and the adjusting portion of the second fence portion are connected to each other by a tongue and a groove. 11. The circle according to claim 10, wherein the groove is formed in the fixing portion of the second fence portion, and the convex edge is formed in the adjustment portion of the second fence portion. saw. 12. The circular saw according to claim 11, further comprising a lock member for connecting the adjusting portion and the fixing portion of the second fence portion.