Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
  • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
  • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws

Definitions

• 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.
• a 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• 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.
• the other end of the shield link is an arc-shaped retaining elbow that snaps onto the first set screw.
• 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.
• 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.
• FIG. 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.
• 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 ⁇ 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
• 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.
• the movable cover 3 can be gradually turned up, as shown in Fig. 1, the saw blade 5 is in contact with the workpiece.
• 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.
• 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.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Sawing (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44575051

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (4)

Citations (5)

• 2011
  • 2011-01-31 CN CN2011200339281U patent/CN201969945U/zh not_active Expired - Fee Related
  • 2011-04-10 BR BR112012009675A patent/BR112012009675A2/pt not_active IP Right Cessation
  • 2011-04-10 WO PCT/CN2011/072579 patent/WO2012103688A1/zh active Application Filing
• 2012
  • 2012-10-11 CL CL2012002856U patent/CL2012002856U1/es unknown

Patent Citations (5)

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