WO2011026303A1

WO2011026303A1 - Hand-held circular saw guard locking mechanism

Info

Publication number: WO2011026303A1
Application number: PCT/CN2010/000635
Authority: WO
Inventors: 卢韬
Original assignee: 宁波捷美进出口有限公司
Priority date: 2009-09-07
Filing date: 2010-05-06
Publication date: 2011-03-10
Also published as: CN201493556U

Abstract

A hand-held circular saw guard locking mechanism comprises a housing (1) having a hand-held tail portion for gripping and a working head, wherein the housing (1) is provided with a driving mechanism therein; a blade (2) driven by the driving mechanism and rotatablely disposed in the working head, wherein at least a portion of the blade (2) forwardly protrudes from the working head; a guard (3) used for enclosing the blade (2) protruding from the working head, wherein the guard (3) is rotatablely disposed on the housing (1), and is provided with an elongated opening (7) thereon which is used for the blade (2) to protrude from the guard (3) when the guard (3) is rotated backward relative to the working head; wherein a locking mechanism capable of restricting the rotating of the guard (3) and unlocking the restriction under external force is provided on the outer wall of the housing (1). Compared with the prior art, the guard (3) can be moved to use the circular saw only when the locking of the guard (3) is unlocked by the locking mechanism, thereby avoiding the harm to the user by the protruding of the blade (2) due to mis-operating, therefore the use of the circular saw is safer.

Description

Hand-held circular saw guard safety locking mechanism

The present invention relates to a shroud mechanism for a hand-held electric circular saw, and more particularly to a hand-held circular saw shroud safety locking mechanism. Background technique

Electric circular saws are generally classified into table circular saws, hand-held circular saws, and hand-held circular saws depending on the mode of use, which typically include a drive mechanism and a saw blade that is driven to rotate by a drive mechanism. For reasons of safety and ease of use, a shield that encloses the saw blade is usually provided on the saw blade. For table saws and hand-held circular saws, since the saw blade is arranged outside the drive mechanism, the cover is usually divided into two parts, that is, the partial saw blade covers substantially the split structure, including the fixed upper part. a shroud and a movable lower shroud, the upper shroud covers the upper portion of the saw blade, the relative position of the saw blade does not change, and the lower shroud movably surrounds the lower portion of the saw blade, in use When moving the lower shield, the lower part of the saw blade is exposed for easy operation. The shields in the Chinese patents CN100346947C, CN201179573Y CN1505556A> CN2191073Y are all such structures. For the hand-held circular saw, since the hand operator is required to hold the hand, it is usually provided with a housing in which various components are mounted, and the housing can be divided into a hand held by the operator. The tail and the working head are two parts; a saw blade that can be driven to rotate is disposed on the working head, and a part of the saw blade exposes the housing to facilitate cutting. In order to protect the saw blade of the electric circular saw, the user is protected from the sawtooth on the saw blade, and the housing is provided with a movable shield that can enclose the saw blade. The existing hand-held circular saw shroud is not provided with a shroud locking mechanism, so the shroud may be exposed due to misoperation, so that the user may be injured due to misoperation when the motor circular saw is not working. What's more, the saw blade may be rotated by mistakenly pressing the switch, so that the saw blade exposed outside the shield is more harmful. Summary of the invention

The technical problem to be solved by the present invention is to provide a circular saw guard safety locking mechanism according to the current state of the art. The locking mechanism must be opened by a user-determined operation to expose the saw blade to achieve safer use. The purpose is to ensure that the user will not be accidentally injured even in the case of misoperation.

The technical solution adopted by the present invention to solve the above technical problem is as follows: The hand-held circular saw guard safety locking mechanism comprises:

a housing having a drive mechanism therein, having a hand-held tail and a working head for the operator to hold;

a saw blade, driven by the driving mechanism, rotatably disposed on the working head, and at least partially sawing

- 1-

Confirmation Exposed to the outside of the work head;

a shroud for enclosing the saw blade exposed to the working head, rotatably disposed on the casing, wherein the saw blade is exposed when the shroud is rotated backward relative to the working head a narrow hole in the cover;

The outer wall of the casing is provided with a locking mechanism capable of restricting rotation of the shroud and releasing the restriction by an external force.

The setting of the locking mechanism allows the user to move the shield to expose the saw blade only when the restriction of the locking mechanism is released. The electric circular saw is used to completely avoid the damage of the saw blade exposed by the erroneous operation.

The locking mechanism can adopt various structural forms, such as a snap structure, and a groove is arranged on the outer wall of the casing, and a card block is arranged in the groove, and the card block is inserted into the groove to limit the position. The shield, the card block is taken out of the groove, the shield can be moved; or the screw is used to limit the position, and the like.

Preferably, for the convenience of operation, the locking mechanism may include a blocking piece, wherein the middle portion has a protrusion, and the protrusion is rotatably supported and positioned on an outer wall of the housing, and one end thereof is opposite to the protection a cover, and the thickness of the protrusion is slightly larger than the thickness of the shield;

An elastic member disposed between the other end of the blocking piece and the outer wall of the housing, such that the other end of the blocking piece has a tendency to be away from the housing, so that one end of the blocking piece abuts against the outer wall of the housing to interfere with the Shield. The locking mechanism simply locks one end of the flap to disengage the shield from the locking mechanism.

For processing and assembly of the component, a bump may be provided on the outer wall of the housing, the bump having a stud; and the projection has a shaft hole for receiving the stud therein.

The elastic member may be a spring, and the other end of the blocking piece is provided with a positioning post on a side facing the outer wall of the housing, and the outer wall of the housing is provided with a groove corresponding to the positioning post, the spring The limit is between the positioning post and the groove.

As an improvement of the above solution, one end of the shroud may be pivotally connected to the top of the casing, and a limiting hole is disposed on a side of the other end of the shroud, and an outer wall of the casing is disposed in the limiting hole. Limit block.

Compared with the prior art, the present invention provides a locking mechanism for the shield on the outer wall of the casing, so that the circular shield can be used to move the shield only after the locking mechanism is unlocked by the locking mechanism, thereby completely avoiding the erroneous operation. The resulting saw blade is exposed to the user and is safer to use. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective structural view showing a locked state of a shield according to an embodiment of the present invention;

2 is a schematic perspective view showing the locked state of the shield in the embodiment of the present invention;

FIG. 3 is a schematic perspective structural view showing another angle of the shield in the locked state according to the embodiment of the present invention. detailed description The invention will be further described in detail below with reference to the embodiments of the drawings.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the circular saw guard safety locking mechanism comprises a housing 1 in which various components are located, and a rotatable saw blade 2 is provided on the top of the housing 1 , and the saw blade 2 It is disposed at the top of the casing 1, a part of which is located in the casing 1, and the other part is exposed outside the casing 1. One end of the shroud 3 is pivotally connected to the top of the casing 1 through the shaft 4, and the other side of the shroud 3 has a limit The position hole 5 corresponds to the limiting hole 5, and the outer wall of the casing 1 is provided with a limiting block 6 accommodated in the limiting hole 5, and the side surface of the shroud 3 is provided with the shielding plate 2 for exposing the protective cover 3 The narrow hole 7.

The outer wall of the casing 1 is provided with a projection 8 at a position adjacent to the other end of the shield, and the projection 8 has a boss 9 parallel to the outer wall of the casing. The middle portion of the flap 10 for locking and being unlocked by an external force has a projection 11 which protrudes from the height of the shield 10 slightly larger than the thickness of the shield 3, and the projection 11 is provided with a receiving projection The shaft hole of the column 9. After the boss 9 is installed in the shaft hole, the blocking piece 10 is supported and mounted on the outer wall of the casing 1 with the protrusion 11 as a fulcrum. At this time, the other end of the blocking piece 10 is close to the shield 3 and away from the shield 3. A positioning post 12 is disposed on one side of the outer wall facing the outer casing. The outer wall of the casing 1 is provided with a corresponding recess 13 . One end of the spring 14 is sleeved on the positioning post 12 and the other end is located in the recess 13 .

When the circular saw is not working, one end of the blocking piece 10 is externally stretched relative to the outer wall of the housing by the elastic force of the spring 14, so that the other end of the blocking piece 10 abuts against the outer wall of the housing, at this time, regardless of the shield 3What kind of force is received, the shield 3 cannot be moved under the stop of the flap 10, and the saw blade 2 is always completely covered, so that the saw blade 2 is not exposed outside due to misoperation under any circumstances. Shield 3 hurts people. When the power saw is needed, the power switch of the power saw is connected, and then the user is required to press one end of the flap toward the housing to make the flap 10 tilt upward with the protrusion 11 as a fulcrum, even if the other end of the flap Leaving the outer wall of the casing and having a certain gap with the outer wall of the casing, the electric saw is pressed at this time, and the shroud 3 is rotated along the shaft 4, so that the saw blade 2 passes through the narrow hole 7 to expose the shroud 3. The cutting operation is ready. Very safe to use.

Claims

Rights request

1. A hand-held circular saw guard safety locking mechanism, comprising:

a housing (1) having a driving mechanism therein, having a hand-held tail portion and a working head for the operator to hold; a saw blade (2) driven by the driving mechanism and rotatably disposed on the working head And at least a portion of the saw blade is exposed outwardly outside the working head;

a shield (3) for surrounding a saw blade (2) exposed to the working head, rotatably disposed on the casing (1), the shield having the saw blade (2) An elongated hole (7) exposed to the shield (3);

It is characterized in that the outer wall of the casing (1) is provided with a locking mechanism capable of restricting the rotation of the shield (3) and releasing the restriction by an external force.

2. The hand held circular saw guard safety locking mechanism of claim 1 wherein said locking mechanism comprises:

a blocking piece (10) having a protrusion (11), wherein the protrusion (11) is rotatably supported on an outer wall of the housing (1), and the first end of the blocking piece (10) is abutted against the housing Shield (3), and the thickness of the protrusion (11) is slightly larger than the thickness of the shield (3);

An elastic member is disposed between the second end of the blocking piece (10) and the outer wall of the housing (1), so that the second end of the blocking piece (10) has a tendency to be away from the housing, thereby making the blocking piece (10) The first end abuts against the outer wall of the housing to oppose the shroud (3).

3. The hand-held circular saw guard safety locking mechanism according to claim 2, characterized in that the outer wall of the casing (1) is provided with a bump (8), and the bump (8) is provided with a convex a post (9); the projection (11) has a shaft hole for receiving the stud (9) therein.

4. The hand-held circular saw guard safety locking mechanism according to claim 2, wherein the elastic member is a spring, and the other end of the blocking piece (10) is positioned on a side opposite to the outer wall of the casing. a column (12), the outer wall of the casing (1) is provided with a groove (13) corresponding to the positioning post (12), the spring is limited to the positioning post (12) and the groove (13) ) between.

The circular saw guard safety locking mechanism according to any one of claims 1 to 4, characterized in that one end of the shield (3) is pivotally connected to the top of the casing (1), the shield (3) A limiting hole (5) is arranged on the side of the other end, and a limiting block (5) received in the limiting hole (5) is arranged on the outer wall of the housing (1).