JPH07148703A - Saw - Google Patents

Abstract

PURPOSE: To form a stable bevel pivot structure by specifying an axis for pivotably securing a pivot member mounted with a saw blade assembly to a pivot block by a plurality of opposed pivoting surfaces, and forming the one surface to a surface of the table. CONSTITUTION: The saw 10 has a saw blade assembly 20 mounted on a table 16. That is, the assembly 20 is pivotally secured along a first axis 92 and a second axis 28 perpendicular to a plane of a saw blade 36. The assembly 20 is raised or lowered along the axis 28 to cut a work piece supported by a fence 17. Then, a pivotal motion of the assembly 20 along the axis 92 is specified by two opposed pivoting surfaces of a concentric circle at the axis 92 as a center. That is, the opposed pivotal surface is formed of a spindle, and installed in a recess of the table 16. Meanwhile, the member 26 has a protrusion corresponding to the recess.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chop saw, and more particularly to a combination saw of a miter saw and a table saw. More specifically, the present invention relates to a saw that can bevel cut in a mitering saw mode and a table saw mode.

[0002]

2. Description of the Prior Art Miter saws usually require that the table saw always have a slot in the workpiece support or table through which the saw blade passes. In a miter saw, the saw blade passes through a slot in the workpiece support after the saw blade cuts the workpiece. In the table saw, the saw blade is attached to the lower side of the work piece support, and the part of the cutting blade comes out above the work piece support to cut the work piece. To keep the damage to the work piece to the minimum on the side of the work piece adjacent to the work piece support when the saw blade cuts the work piece,
The workpiece support slots should generally be kept as narrow as possible.

If the saw, be it a miter saw or a table saw, can bevel cut at various bevel angles, the slots in the workpiece support are saw blades at any of the various bevel angles. Must be able to accommodate. Since the critical width of the workpiece support slot is the width at the surface, or top surface, of the workpiece support that actually supports the workpiece, the requirement to minimize workpiece damage is to change the bevel angle to cut. There is a saw blade for pivoting on the axis, which is arranged on the surface of the workpiece support. An example of a miter saw including such a structure is described in US Pat. No. 4,537,105. In that saw, the workpiece support includes a bearing block with partially circular guide slots. The saw blade mounting includes similar bearing blocks, the two bearing blocks working together to permit relative arcuate pivoting movement about the center of curvature of the guide slot.
The center of curvature of the guide slot coincides with the top of the slot in the workpiece support.

[0004]

Problems to be Solved by the Invention US Pat. No. A45314
No. 41 discloses a combination saw of a miter saw and a table saw, i.e. a flip over saw including a similar bevel pivot structure. In this saw, the bevel axis of the saw blade is aligned with the upper surface of the workpiece support when the saw operates as a table saw. Therefore, when the saw operates as a miter saw, the bevel axis coincides with the lower surface of the workpiece support. Thus, when the saw acts as a miter saw, the saw has relatively poor protection against workpiece damage that occurs after the saw blade cuts the workpiece. Bevel angle is ± 45 to vertical
If adjustable between degrees, the slot in the workpiece support is at least twice the thickness of the workpiece support when operating as a miter saw.

A further problem with the two prior art bevel pivot structures is that the pivots tend to play to some extent due to the unavoidable tolerances of the mating surfaces of the partially circular or partially cylindrical bearing portions. There is. This has the consequence that the bevel axis is not well defined, which means that the width of the slots in the workpiece support must be increased somewhat to allow for this, which does not affect the accuracy of cutting the workpiece. Needless to say.

This problem has been recognized and is described in US Pat.
No. 4,934,233 proposes a solution to this in the area of miter saws. In the saw described in this prior art, the bevel pivot structure described above is replaced by a pair of cylindrical members of the same diameter, whose end faces abut each other, and which allow them to rotate relative to each other about a central spindle. It has become. The use of the central spindle allows the bevel axis to be well defined, but this bevel axis coincides with the upper surface of the workpiece support and the radial extent of the cylinder substantially reduces the amount of pivot play. To do. However, the use of a cylindrical member means that it is inevitable that there will be protrusions above and below the workpiece support, and such a configuration is not suitable for use as a table saw, and thus a flip over saw. Is unsuitable as

It is an object of the present invention to provide a saw having a bevel pivot structure with improved stability.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a frame, a table pivotally mounted to the frame in two positions and having opposing first and second surfaces, and a first of the tables. A pivot block mounted on the surface of the table and substantially parallel to the first and second surfaces of the table relative to the pivot block and the first and second surfaces.
A pivot member pivotally mounted about a first axis in the region of the surface of the blade, and a saw blade assembly mounted on the pivot member and having a saw blade in a plane containing the first axis. A table slot suitable for receiving the saw blade enabling cutting of a workpiece supported on either surface of the table, and a clamp for clamping the pivot member and the pivot block together Means, the first axis being defined by opposing first and second arcuate pivot surfaces between the pivot member and one or both of the pivot block and the table, and at least a first axis. A saw is provided, wherein an arcuate pivot surface is formed between the first and second surfaces of the table.

Preferably, the pivot surface comprises a bore in the protrusion of the pivot member and a pin which hangs over a slot in the table. Alternatively and preferably, the first pivot surface comprises a substantially partial cylindrical surface of a protrusion of the pivot member and a substantially partial cylindrical surface of a recess formed in the table, the protrusion being received in the slot. . In this case, the second pivot surface comprises another substantially partial cylindrical surface of the projection and a substantially partial cylindrical surface of the pivot member above the first surface of the table.

[0010]

In this way two conflicting requirements are fulfilled. First, there are no protrusions beyond the second surface of the table, and the second surface of this table is the working surface of the saw in bench saw mode and is a flat, unobstructed plane for effective operation. Is the surface that is required to be. Second, the pivot axis of the pivot member is well positioned, reducing or eliminating the possibility of misalignment that would result in saw blade position error.

Preferably, the pivot axis is in the middle of the first and second surfaces of the table, more preferably in the center between them, on either surface the slot entrance can be minimized.

Preferably, the substantially partial cylindrical surface of the recess extends at an angle that is 180 degrees less than the required pivot angle about the first axis of the pivot member. Preferably, the projection is supported against its axial movement.
The support comprises a radial surface formed in the recess with respect to a first axis. Adjustment means may be included for axially adjusting the radial surface. The adjusting means comprises a wedge portion received at the end of the recess of the table and forming the first radial surface, and screw means is received in the wedge portion for axially aligning the wedge portion with respect to the first axis. It may be suitable for pulling in the direction.

As in US Pat. Nos. 4,531,441 and 4,453,105, the pivot block cooperates with the pivot member in an arcuate movement about the relative first axis of the pivot block and the pivot support. Is preferably allowed. Conveniently, the clamping means comprises the pivot block having an arcuate slot and the pivot member comprises a locating pin that engages the arcuate slot of the pivot block. The locating pin comprises, for example, a releasable bolt capable of holding the pivot member on the pivot block.

Preferably, the pivot member further comprises a pivot guide mounted to the pivot block remote from the pivot member, the pivot block holding the releasable bolt therebetween when the bolt is released. To be done. Above all, the pivot guide closes the arcuate slot of the pivot block to prevent dust from entering.

[0015] Preferably, for obvious reasons, the pivot members include a stop surface adapted to abut the table to limit rotation of each other.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the saw 10 comprises a saw blade assembly 20 mounted on a workpiece support or table 16. The saw blade assembly 20 is a table 16
Is pivotally mounted about two separate and orthogonal axes 28, 92. The pivot member or support 26 is the workpiece support or table 16
The table 16 is pivotally mounted about an axis 92 parallel to the upper and lower surfaces of the table 16 and coincident with the plane of the saw blade 36. Details of mounting will be described later. Saw blade assembly 20
It is pivotally mounted to the pivot support 26 about a first axis 92 and a second axis 28 perpendicular to the plane of the saw blade 36. Pivot about the second axis 28
It allows the saw blade assembly 20 to be raised and lowered, allowing the saw blade 36 to engage and cut a workpiece supported against the fence 17 on the table 16.

To enable the mitering cut to be performed when the saw 10 operates as a mitering saw,
The rounded portion of table 16 is rotatable about an axis perpendicular to the rest of table 16. The saw blade assembly 20 rotates with the rounded portion of the table 16. The fence 17 is fixed in place on the rest of the table 16.

The saw 10 inserts a saw blade 36 into a slot (not shown) in the table 16 and the saw blade assembly 20.
Locking in this position enables it to be used as a table saw. The table 16 is then pivoted 180 degrees by means not shown so that the saw blade 36 projects from the bottom with the bottom of the table facing up. Such a saw was first described in DE-A-1628992,
Also preferably, the pivot structure of table 16 is also described in pending UK patent application No. 9218363.1.

The pivoting of the saw blade assembly 20 about the first axis 92 allows the bevel cut of the saw 10 when operating as a miter saw or as a table saw. As better shown in FIGS. 2-5, the pivoting of the pivot support 26, and thus the saw blade assembly 20, about the first axis 92 is concentric about the first axis 92. Opposite 2
Controlled by two pivot planes (discussed further below). The use of two concentric pivot surfaces reduces any undesirable possibility of bevel axes.

A pivot block 27 mounted on the round rotating portion of the table 16 is adapted to cooperate with the pivot support 26 to effect relative arcuate sliding movement of these two members. There is. The pivot member or pivot support 26 has a bolt 1 extending therethrough.
70, and this bolt 170 has a pivot block 27
The circular arc shaped slot 173 is received. Bolt 170
Is suitable for holding the pivot support 26 on the pivot block 27 and is releasable. To this end, the bolt 170 includes a handle 172 and cooperates with a set nut or other set screw in a known manner. In particular, bolt 170 is described in our UK patent application 9218.
366.1.

In the first embodiment, the concentric opposite pivot surfaces are formed by pins or spindles 92 'which are fitted into the work support or rotatable portion of the table 16 and the table. It hangs sideways on sixteen semicircular recesses 90. The pivot support 26 has a semi-circular recess 90.
The spindle 92 ′ extends through the lug 88 with a corresponding lug or protrusion 88 received therein. Thus, relative rotation of the pivot support 26 with respect to the table 16 occurs about the spindle 92 '. This configuration provides stable pivoting and positions the first axis 92 between opposing surfaces of the workpiece support or table 16. In the exemplary embodiment, the first axis 92 is centered between the opposing surfaces of the table 16 so that the width of the slot (not shown) in the table 16 required for the passage of the saw blade 36 is minimized. Position it.

The fact that the lug 88 of the pivot support 26 is tightly received in the semi-circular recess 90 enhances the stability of the bevel pivot and thus prevents undesired axial movement. However, this configuration may have the following problems. That is, if the clamping means formed by the bolt 170 is loosened more than necessary, extreme bending forces about an axis parallel to the axis 28 (at least in the table saw mode) are exerted on the spindle 92 'by the weight of the saw blade assembly 20. Can cause considerable damage to the saw in the area of bending of the spindle and / or table.

Accordingly, FIGS. 3 and 5 show a second preferred bevel pivot structure embodiment. In this case, there is no pin or spindle, and the pivot lug 88 is received in a correspondingly shaped semi-circular recess 90 in the rotatable portion of the table. Further, the pivot block 27 and the pivot lug 88 each have a substantially partially cylindrical pivot surface 130, 132. Pivot surface 1
30 is carried by the pivot block 27 and is formed on a plate 134 which is press-molded. Pivot block 2
The pivot surface 130 carried by 7 faces the first axis 92. The other pivot surface 132 faces in the opposite direction.
When the saw operates as a chop saw, the load is carried by the lug 88 and the recess 90. However, when the saw is in the table saw mode, it is the partial cylindrical pivot surfaces 130, 132 that play this role. The configuration of the lug 88 and the recess 90 and the pair of pivot surfaces 130, 132 provide pivotal movement about the first axis 92 and cooperate to provide a stable pivot axis.

The lug 22 is supported for axial movement by the end of the recess 90. Towards the pivot block 27, there is a small clearance between the lug 88 and the end 91 of the recess 90, which clearance is not closed when the clamp bolt 170 is tightened. However, when the saw is in bench saw mode and the bolt 170 is over loosened, the lug 88 abuts its end. However, the flexibility of the plate 134 in the area of the pivot surface 130 absorbs the torsional load without permanent damage to the table or lug. At the other end, a wedge of nylon or similar 1
80 is held by screws 182. Upon tightening the screw, the wedge 180 is pulled downwardly and axially against the lug 88, thus supporting the lug 88 when the bolt 170 is excessively loosened when in chop saw mode. Very little force is exerted on the pivot support 26 when the bolt 170 is very loose in this position.
Acting on the wedge 180 via the shaft to try to pivot about an axis that extends somewhat through the bolt 170 but extends parallel to the axis 28. If the force is sufficient to damage the wedge 180, then this part can be easily replaced.

The pivot support 26 further includes a pair of stop surfaces 174,176. This stop surface 1
74, 176 have the pivot support 26 vertical and 45 with respect to the table or workpiece support 16.
The movement of the pivot supports 26 is respectively restricted by abutting against the table 16 when tilted at an angle of degrees.

Thus, the advantages obtained by both embodiments are:
More precise positioning of the bevel axis is achieved than that achieved by US Pat. No. 4,934,233, while the lower pivot surface (when in miter saw mode) is at the level of the lower surface 16b of the table 16. Does not extend below. Thus, this pivot surface does not become a protrusion that prevents effective use of the saw when it is switched to bench saw mode.

It is to be understood that the present invention has been described above by way of example and modifications of detail can be made without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a side view of a saw according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a first bevel pivot structure.

FIG. 3 is an enlarged side view of a second preferred bevel pivot structure.

FIG. 4 is a front view of the bevel pivot structure of FIG.

5 is a front view of the bevel pivot structure of FIG.

[Explanation of symbols]

 12 ... Frame 16 ... Table 20 ... Saw blade assembly 26 ... Pivot member 27 ... Pivot block 28 ... Axis 36 ... Saw blade 88 ... Protrusion 90 ... Recess 92 ... Axis 92 '... Spindle 130 ... Partial cylindrical pivot surface 132 ... Partial cylindrical pivot Surface 170 ... Bolt 180 ... Wedge

Claims (16)

[Claims] 1. A frame, a table pivotally mounted to the frame in two positions and having opposing first and second surfaces; and a pivot block mounted to the first surface of the table. Pivotally mounted to the pivot block about a first axis substantially parallel to the first and second surfaces of the table and in the region of the first and second surfaces With pivot members,
A saw blade assembly mounted on the pivot member and having a saw blade in a plane containing the first axis and receiving the saw blade to allow cutting of a workpiece supported on either surface of the table. A slot suitable for the table, and clamping means for clamping the pivot member and the pivot block together, the first axis being one of the pivot member, the pivot block and one of the tables. Alternatively, at least a first arcuate pivot surface is defined by opposing first and second arcuate pivot surfaces between the first and second arcuate pivot surfaces.
A saw formed between the surfaces of the saw. 2. The saw according to claim 1, wherein the pivot surface comprises a bore of a protrusion of the pivot member and a pin hooked in a slot of the table. 3. The first pivot surface comprises a substantially partial cylindrical surface of a protrusion of the pivot member and a substantially partial cylindrical surface of a recess formed in the table, the protrusion being received in the slot. The saw according to claim 1, wherein the saw. 4. The second pivot surface comprises another substantially partial cylindrical surface of the protrusion and a substantially partial cylindrical surface of the pivot member above the first surface of the table. The saw according to claim 3. 5. A substantially partial cylindrical surface of the recess extends at an angle less than 180 degrees less than a required pivot angle about the first axis of the pivot member. Saw described in. 6. The saw according to claim 3, wherein the projection is supported against the axial movement of the projection. 7. The first support formed in the recess is the support.
The saw according to claim 6, comprising a surface in a radial direction with respect to the axis of the saw. 8. The saw according to claim 7, further comprising adjusting means for adjusting the radial surface in the axial direction. 9. The adjusting means comprises a wedge portion received at the end of the recess of the table and forming the first radial surface, and screw means is received by the wedge portion to define the wedge portion. Saw according to claim 8, adapted to be pulled axially with respect to one axis. 10. A saw according to any one of claims 1 to 9, characterized in that the pivot axis is intermediate the first and second surfaces of the table. 11. The pivot axis is centered between the first and second surfaces of the table so that the entrance of the slot can be minimized on either surface. Saw. 12. The pivot block cooperates with the pivot member to permit arcuate movement of the pivot block and the pivot support about a relative first axis. The saw according to any one of 1 to 11. 13. The clamping means comprises the pivot block having an arcuate slot, and the pivot member comprises a locating pin that engages the arcuate slot of the pivot block. The listed saw. 14. The saw according to claim 13, wherein the locating pin comprises a releasable bolt capable of holding the pivot member on the pivot block. 15. The pivot member further comprises a pivot guide mounted to the pivot block remote from the pivot member, the pivot block being held between the releasable bolts when they are released. The saw according to claim 14, wherein the saw. 16. A saw as claimed in any one of the preceding claims, wherein the pivot members include stop surfaces adapted to abut the table to limit rotation of each other.