Electric saw

Abstract

The present invention relates to an electric saw, comprising: a support (2) mounted on a base (1), a cutting head (3) mounted on the support via a rotation axis perpendicular to the support, and an adjustable stopper (5) for limiting the descent and cutting depth of the cutting head. The adjustable stopper (5) comprises: a rod (51) mounted in a through and longitudinally movable manner in a channel (53) defined by the cutting head (3) and facing a fixed stopper (21) defined in the support (2); and a screw (54) for transversely fastening the rod (51) and fixing it in the channel (53). The screw (54) is provided with a driving knob (55) and is threadedly mounted in a hole defined by the cutting head (3), the hole leading to the channel (53) where the rod (51) is mounted. The electric saw of the present invention greatly simplifies the positioning and fixing of the adjustable stopper at different heights, so as to facilitate cutting at different depths.

Description

Technical Field

[0001] The invention relates to the field of cutting machines, in particular to an electric saw, which comprises a cutting head mounted on a bracket via an axis, wherein the cutting head is provided with a cutting disc and a device for adjusting the lateral inclination and vertical displacement of the cutting head. Background Art

[0002] Currently, the known electric saw comprises a support and a cutting head. The support is mounted on a workbench and is used to support a workpiece to be cut. The cutting head is equipped with a cutting disc and a driving motor, and the driving motor is used to drive the cutting disc.

[0003] In this type of saw, the cutting head is mounted on a bracket and can be rotated in the vertical direction to change the cutting depth; in addition, it includes a height-adjustable stop that limits the descent of the cutting head and thus the cutting depth of the saw.

[0004] Document US 9016180 discloses a saw of this type, in which the cutting head has an adjustable stop configured to limit the range of movement of the cutting, in particular to limit the descent of the cutting head and the cutting depth of the cutting disc into the workpiece to be cut.

[0005] In the above-mentioned document, the adjustable stop comprises a bolt which is threadedly mounted on the cutting head or the bracket of the saw; the bolt has an adjustable height which rests on the bracket or the cutting head, respectively, to limit the downward movement of the cutting head, thereby more or less limiting the cutting depth.

[0006] One disadvantage of such adjustable stops is that the adjustment of the bolt height is time-consuming and laborious, because each time the cutting depth is adjusted, the bolt must be rotated to tighten or loosen the bolt on the cutting head or bracket until the desired height is reached. In order to secure the bolt in a selected position on the cutting head or bracket, a locking nut is provided, which must also be rotated until it contacts the cutting head or bracket, further increasing the time required to position and secure the adjustable stop at the selected height.

[0007] The technical problem posed is therefore to develop an adjustable stop that facilitates and simplifies the variation of the height of the saw when the cutting depth needs to be adjusted. Summary of the invention

[0008] The electric saw of the present invention comprises a base, a bracket mounted on the base, a cutting head, a rotating shaft perpendicular to the cutting head for changing the cutting depth, and an adjustable stopper for limiting the cutting depth; the cutting head carries a cutting disc and a driving motor for driving the cutting disc. The technical features of the electric saw of the present invention greatly simplify the positioning and fixing of the adjustable stopper at different heights, so as to facilitate cutting at different depths.

[0009] According to the present invention, the adjustable stop comprises: a smooth rod (without thread) which is installed in a through-going and longitudinally slidable manner in a channel defined by the cutting head and faces a fixed stop, the fixed stop being used to support the rod provided on the bracket of the electric saw; and a screw for transversely tightening the rod and fixing it in the channel at a desired height.

[0010] The fixing screw comprises a driving knob, and the screw is threadedly mounted in a threaded hole provided in the cutting head, the threaded hole leading to the passage for mounting the rod for limiting the cutting depth.

[0011] The screws, threaded holes and their threads are dimensioned so that the rod can be quickly secured or released by rotating the screw through an angle of less than 180°.

[0012] The passage for mounting the rod is vertically oriented with sufficient space to mount the rod and allow the rod to drop by gravity in the passage, so that when the cutting head is in the upper rest position, the rod is simply released and it drops by gravity until it contacts the fixed stop of the bracket. When it is necessary to adjust the cutting depth, the cutting head is simply lowered until the desired cutting depth is reached and the rod is then secured by turning the drive knob of the screw in the tightening direction.

[0013] The operation is very simple and quick, since it is sufficient to release the lever and lower the cutting head to the cutting height desired by the user, and the lever is automatically placed in the corresponding position relative to the cutting head. Once the lever is fixed in this position, it prevents the cutting head from descending beyond the position previously selected by the user, thus achieving continuous cutting of the same depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] As a supplement to the description provided in this specification, and in order to help make the features of the invention more easily understood, this specification is accompanied by a set of drawings which represent the following by way of illustration and not limitation:

[0015] Figure 1 is a cross-sectional view of an exemplary embodiment of the electric saw of the present invention, showing the rotation axis of the cutting head in its vertical direction and an adjustable stop for adjusting the cutting depth;

[0016] Figures 2 to 4 for Figure 1 A partial cross-sectional view of the electric saw cut along a vertical plane, showing the cutting head and the adjustable stop in different positions;

[0017] Figure 5A detailed perspective view of the adjustable stop used to adjust the cutting depth. DETAILED DESCRIPTION

[0018] like Figure 1 As shown, the electric saw of the present invention comprises a base (1), a bracket (2) mounted on the base and a cutting head (3), wherein the cutting head (3) is provided with a cutting disc (31) driven by a motor.

[0019] The cutting head (3) is mounted on the bracket (2) via a rotating shaft (4) perpendicular thereto so as to perform cutting at different depths.

[0020] The electric saw comprises an adjustable stop (5) as shown in the accompanying drawings for limiting the depth of cutting.

[0021] The adjustable stopper (5) comprises a smooth non-threaded rod (51) and a screw (54); a knob (52) is provided at the upper end of the rod (51); the rod (51) is installed in a through-going manner in a channel (53) defined by the cutting head (3) and can slide in the longitudinal direction and toward a fixed stopper (21) provided on the bracket (2); the screw (54) is used to transversely tighten the rod (51) and fix it at a desired height.

[0022] The screw (54) for transversely tightening and fixing the rod (51) includes a drive knob (55), and the screw (54) is installed in a threaded hole defined in the cutting head (3) and leads to the channel (53) where the rod (51) is installed.

[0023] In the embodiment shown in the drawings, the rod (51) has a flat surface (51a) facing the screw (54) used to transversely tighten and fix the rod (51).

[0024] The screws (54) used for fixing, the threaded holes for mounting the screws (54) and the dimensions of their threads are designed so that the rod (51) can be quickly fixed or released by rotating the drive knob (55) by less than 180°.

[0025] like Figure 3 As shown, the channel (53) is vertically oriented, so when the drive knob (55) is rotated in the direction of loosening the screw (54), the rod (51) will fall due to gravity until its end falls on the fixed stop (21) of the bracket (2).

[0026] like Figure 3As shown in FIG. 1 , when the cutting head (3) is lowered to a desired cutting depth, the height position of the rod (51) relative to the cutting head (3) is automatically adjusted. At this time, the driving knob (55) can be rotated in the direction of tightening the screw (54) to fix the rod (51) at the selected position and keep it at the same height position relative to the cutting head (3). Figure 5 as shown to make continuous cuts at the previously selected depth.

[0027] The essence of the present invention having been fully described, except for the preferred exemplary embodiments, it is hereby stated that for relevant purposes, the materials, shapes, sizes and arrangements of the elements described may be modified without thereby implying a change in the essential characteristics of the invention as claimed.

Claims

1. An electric saw, comprising: a base, a bracket mounted on the base, a cutting head equipped with a cutting disc, the cutting head being mounted on the bracket via a rotation axis perpendicular thereto, and an adjustable stopper for limiting the descent and cutting depth of the cutting head; Characterized in that the adjustable stopper comprises: a smooth, threadless rod having a knob at its upper end, mounted in a through-going manner in a channel and directed toward a fixed stop provided on the support, the channel being defined in the cutting head and arranged in a vertical direction; and a screw for transversely fastening the rod and fixing the rod in the passage, the screw being provided with a drive knob and being mounted in a threaded hole provided in the cutting head, the threaded hole leading to the passage; When the driving knob of the screw is rotated in the direction of loosening the screw, the rod slides down in the channel due to gravity and moves toward the fixed stopper; The screw and its threads and the threads of the threaded hole are dimensioned and configured to secure or release the rod by rotating the drive knob through an angle of less than 180°.

2. The electric saw according to claim 1, characterized in that: The rod has a flat surface facing the screw for transversely tightening and fixing the rod.

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