WO2012103688A1

WO2012103688A1 - Cutting saw with safety cover

Info

Publication number: WO2012103688A1
Application number: PCT/CN2011/072579
Authority: WO
Inventors: 吴明厅
Original assignee: 上海锐奇工具股份有限公司
Priority date: 2011-01-31
Filing date: 2011-04-10
Publication date: 2012-08-09
Also published as: BR112012009675A2; CL2012002856U1; CN201969945U

Abstract

A cutting saw with a safety cover is disclosed. The cutting saw comprises: a base (4) for placing a workpiece to be processed, a support arm (9) hinged to the base (4), a power supply provided on the support arm (9), a saw blade (5) rotated by the power supply, a sector fixed cover (2) and a movable cover (3) substantially combined to a full circle by which the saw blade (5) may be covered. The support arm (9) is provided with an extension arm (10), a first positioning screw (11) is fixed on the extension arm (10), a second positioning screw (13) is set bypass the first positioning screw (11), one end of a cover connecting rod (7) is hinged on the position near the center of rotation of the movable cover (3), and the other end of the cover connecting rod (7) is chucked on the first positioning screw (11) through the sector fixed cover (2). The safety cover can ensure that the movable cover would not turned up accidentally during the loading-unloading operations of the workpiece while keeping the original turnup action performance of the movable cover.

Description

Cutting saw with safety shield

Technical field

The utility model relates to a cutting saw with a safety shield. Background technique

The basic components of a common saw include: a base for placing the workpiece to be cut, a support arm hinged to the base, a power head mounted on the support arm, and a rotatable saw blade driven by the power head. When the power head is activated to rotate the saw blade, the support arm is pressed down, so that the saw blade can cut the workpiece supported on the base as needed.

In order to ensure safe operation, the upper and lower halves of the saw blade are respectively covered with a fixed shield and a movable shield. The structure of the various types of movable shields is disclosed in the Chinese patent No. ZL200720043502. 8 and the US patent number US5893311, respectively. Wherein, the typical structure is that the fan-shaped geometric center of the fan-shaped movable shield forms a rotating pair with the saw blade shaft, and the predetermined position of the cover of the movable shield is hinged with one end of the shield link, and the other end of the shield link is opened There is a straight groove which is consistent with the extending direction of the connecting rod, and the straight groove and the positioning pin near the hinge point of the supporting arm constitute a moving pair.

Therefore, during the cutting operation, when the support arm is pressed down, the link mechanism rotates the belt movable cover to gradually overlap the fixed shield to expose the saw blade to cut the workpiece; and when the support arm is lifted The above-mentioned link mechanism loses the strap of the movable shield, gradually resets it, returns to the position where it is engaged with the fixed shield, and completely covers the saw blade, thereby preventing the saw blade from causing accidental injury. Since it is considered that the saw blade is a lossy member, when the replacement is required, the shield link can be lifted up, so that the positioning pin near the hinge point of the support arm is opposite to the inner end of the straight groove of the shield link, so that the activity can be flipped up Shield, replace the saw blade to allow the necessary saw blade to enter and exit the space.

However, it is precisely because the above-mentioned existing movable shroud structure has a one-way restraint function, that is, when the support arm is pressed down, the positioning pin near the hinge point of the support arm is opposite to the outer end of the straight groove on the shroud link, thus having a forced pull With the action of the movable guard gradually turning up; but there is no constraint on the relative displacement of the positioning pin to the inner end of the straight groove. Therefore, the movable shield always has the possibility of accidental turning up, and there are still hidden dangers. Strictly speaking, it does not meet the requirements of the second part of the "Special Requirements for Profile Cutting Machines" regarding "the cutting machine should be designed to feed the workpiece during the unloading operation, and the movable shield cannot be unintentionally turned up". Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutting saw that ensures that the movable shield is not inadvertently turned up during the workpiece feeding-unloading operation, while ensuring the original flipping performance of the movable shield.

In order to achieve the above object, the technical solution of the present invention provides a cutting saw having a safety shield, comprising a base for placing a workpiece to be cut, the support arm is hinged on the base, and a power head is arranged on the support arm. The saw blade is driven to rotate by the power head, and the saw blade is covered with a substantially rounded fan-shaped fixed shield and a movable shield, and is characterized in that: an extension arm, a first positioning screw is arranged on the support arm Fixed on the extension arm, the second positioning screw is disposed beside the first positioning screw, one end of the shield link is hinged at a position near the center of rotation of the movable shield, and the other end of the shield link passes through the fan-shaped fixed shield card On the first set screw.

Further, the other end of the shield link is an arc-shaped retaining elbow that snaps onto the first set screw.

When the support arm is pressed to perform the cutting operation, the positioning pin near the hinge point of the support arm is limited by the hook mechanism of the shield link, and the movable shield can be pulled up gradually. At this time, since the hook-and-loop structure has a restraining effect on the clockwise and counterclockwise rotation of the movable shield, it is ensured that the movable shield cannot be unintentionally turned up, thereby ensuring the operation safety. When it is necessary to replace the saw blade, it is convenient to simply pull the positioning pin out of the hook structure. DRAWINGS

1 is a schematic view showing a cutting saw with a safety shield in a cutting state according to the present invention; FIG. 2 is a schematic view showing a cutting saw with a safety shield in a non-cut state according to the present invention; A new type of cutting saw with a safety shield is provided when the blade is replaced. detailed description

The present invention will be specifically described below in conjunction with the embodiments.

Example

As shown in FIG. 1 to FIG. 3, the utility model provides a cutting saw with a safety shield, comprising a base 4 for placing a workpiece to be cut, a support arm 9 hinged on the base by the hinge shaft 8, and placing A power head on the support arm 9 and a rotatable saw blade 5 are driven by the power head. The extension arm 10 is fixed on the support arm 9, The upper end of the extension arm 10 is provided with a first positioning screw 11 and a second positioning screw 13. The outer cover of the saw blade 5 has a fan-shaped fixed shield 2 and a movable shield 3 which are substantially rounded after being combined, and the geometric center of the movable shield 3 forms a rotational pair with the center of rotation of the saw blade, that is, the center of the rotary shaft 6 of the power head. The movable shield 3 is hinged to the end of the shield link 靠近 near the center of rotation, and the other end of the shield link 7 passes through the sector-shaped fixed shield 2, and the end portion makes an arc-shaped retaining elbow stuck in the first positioning On the screw 11, the first positioning screw 11 passes through the through hole in the extension arm 10, and the three components of the movable shield 3, the sector fixed shield 2, and the shield link 7 are connected together, and the first positioning screw 11 is used. It is connected to the extension arm 10 to form a rotating pair.

When the cutting is performed by the handle 1, since the first positioning screw 11 is fixedly rotated, the movable cover 3 can be gradually turned up, as shown in Fig. 1, the saw blade 5 is in contact with the workpiece. When the handle 1 is lifted, the movable shield 3 is gradually lowered by the force of the tension spring 12, and as shown in Fig. 2, the saw blade 5 is completely covered by the fixed shield 2 and the movable shield 3.

When replacing the saw blade, as long as the shield link 7 is slid back to the rear position through the middle of the first set screw 11 and the second set screw 13, as shown in FIG. 3, the movable shield 3 is ready as needed. Turn up and let the necessary saw blade 5 enter and exit the space.

Claims

Rights request:

A cutting saw having a safety shield, comprising a base (4) for placing a workpiece to be cut, a support arm (9) hinged on the base (4), and a power head on the support arm (9) The saw blade (5) is driven to rotate by the power head, and the saw blade (5) is covered with a substantially rounded fan-shaped fixed shield (2) and a movable shield (3), which are characterized in that: The support arm (9) is provided with an extension arm (10), the first positioning screw (11) is fixed on the extension arm (10), and the second positioning screw (13) is arranged beside the first positioning screw (11), the cover One end of the connecting rod (7) is hinged at a position near the center of rotation of the movable shield (3), and the other end of the shield connecting rod (7) is passed through the sector-shaped fixed shield (2) to be caught by the first set screw (11) on.

2. A saw with a safety shield according to claim 1, wherein: the other end of the shield link (7) is an arc-shaped retaining elbow, the curved let-off elbow Jammed on the first set screw (11).