WO2011026304A1

WO2011026304A1 - Cutting depth adjusting and locking mechanism of hand-held circular saws

Info

Publication number: WO2011026304A1
Application number: PCT/CN2010/000636
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: 2010-05-10
Publication date: 2011-03-10
Also published as: CN201493906U

Abstract

A cutting depth adjusting and locking mechanism of hand-held circular saws 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 saw blade (2) driven by the driving mechanism and rotatablely disposed in the working head, wherein at least a part of the saw blade (2) forwardly protrudes from the working head; a guard (3) used for enclosing the saw blade (2) protruding from the working head, wherein the guard (3) is rotatablely disposed on the working head, and an elongated opening (8) is provided on the guard (3) for the saw blade (2) to protrude from the guard (3) when the guard (3) is rotated backward relative to the working head; and a locking mechanism provided on the housing (1) which is capable of restricting and locating the displacement of the guard (3). Compared with the prior art, the adjusting and locking mechanism has a simple structure and its operation is convenient and easy.

Description

Handheld circular saw cutting depth adjustment locking mechanism

Technical field

The present invention relates to an electric circular saw for wood processing, and more particularly to a hand-held circular saw cutting depth adjustment 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 and protect the user from the sawtooth on the saw blade, the housing is also provided with a cover that can surround the saw blade and can be displaced backward relative to the working head to make the saw Exposed cover. The maximum depth of the cut by the size of the shroud.

The existing portable electric circular saw, such as the portable electric circular saw disclosed in the patent number ZL94212915.6 (authorization announcement number CN2191073Y), is an upper protection frame cover with a circular saw blade at the end of the motor and The lower movable protective cover of the circular saw blade that can be rotated and reset, and the upper protective cover or the casing is provided with a reference bottom plate which can be raised and lowered with respect to the circular saw blade. One end of the reference bottom plate is fixed on the upper protection frame cover by a living hinge, and the other end is dynamically coupled with a round pin fixed on the lifting adjustment frame, and the reference bottom plate can be rotated around the living hinge and the round pin, and the rotation and the circle are adjusted and circled. The angle between the saw blades is adjusted by the angle adjustment frame. The angle adjusting frame is composed of a rotating arm, a positioning scale frame and a set bolt which are respectively fixed on the upper protection frame cover and the reference bottom plate. Tighten the bolt housing after the reference base plate is adjusted to the desired angle of the circular saw blade. The reference base plate is provided with an adjustable length support plate, and the length plate is engraved with a scale indicating the length of the telescopic length, and the length is set by the set bolt on the reference base plate after the plate is set. The portable electric circular saw adjusts the cutting depth by changing the relative position of the substrate, and the structure is relatively complicated, and the adjustment and locking operation of the substrate is relatively cumbersome. For hand-held circular saws, there is no relevant report on the cutting depth adjustment.

Confirmation Road. Summary of the invention

The technical problem to be solved by the present invention is to provide a hand-held circular saw cutting depth adjustment locking mechanism for the current state of the art.

The technical solution adopted by the present invention to solve the above technical problems is as follows: The hand-held circular saw cutting depth adjustment 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 drive mechanism and rotatably disposed on the working head, and at least a portion of the saw blade is exposed outwardly from the working head;

a shroud movably disposed on the working head for enclosing a saw blade exposed to the working head; the shroud having an elongated hole through which the saw blade is exposed to the shroud;

The utility model is characterized in that the housing is provided with a locking mechanism capable of limiting and positioning the displacement of the shroud.

The hand-held circular saw cutting depth adjustment locking mechanism provided by the invention has simple and easy adjustment operation of the cutting depth, and only needs to adjust the locking mechanism to the depth required for locking, and then moves the shield to the position of the locking mechanism, that is, Correspondingly, the saw blade is exposed to a predetermined depth to adjust the cutting depth of the saw blade. The locking mechanism has precise depth adjustment, secure locking and safe use.

The locking mechanism can adopt various structural forms. For example, a positioning piece having a groove can be disposed on the housing, the groove has two sides of a tooth shape, and the groove can be disposed therein to be displaced therein. And a slide plate that can be locked by the sides of the tooth, the slide plate can pass through the groove to limit the displacement of the shield. Or may include a multi-stage block and a limiting plate disposed on the housing, the limiting plate being positionable on different blocks to change and define a distance between the limiting plate and the shield . The locking mechanism can also flexibly change a plurality of structures. Preferably, the locking mechanism can include a blocking piece and a bolt, and the blocking piece has a sliding hole through which the bolt is screwed. The structure is more conducive to the operation of the locking mechanism, and the baffle can be easily and conveniently moved and positioned by simply loosening and tightening the bolt.

In order to quantify the moving distance of the flap, a scale scale capable of displaying the displacement of the flap may be provided on the housing. With the scaled scale as a reference, the adjustment locking mechanism makes the adjustment of the depth more precise and convenient.

In order to improve the cutting operation of the circular saw cutting depth, as an improvement of the above solution, the end of the shroud can be pivotally connected to the top of the casing through the shaft, and in the shroud and the casing. There is also an elastic member that has the shield away from the working head so that the saw blade is contained within the shield. In this way, when performing the depth adjustment, it is no longer necessary to adjust and position the shield. Since the shield can rotate around the shaft, the shield can automatically rotate to the depth of the locking mechanism under the action of the cutting pressure during cutting.

Preferably, the elastic member may be a torsion spring sleeved on the shaft, and the structure is relatively compact.

In order to prevent the shield from being disengaged from the housing, a stopper may be disposed on the housing, and the other end of the shield is provided with a limiting hole for receiving the stopper. Through the limit of the stopper to the shield, the shield can perform its own protection saw well. The responsibility of the film.

Compared with the prior art, the present invention provides a hand-held circular saw cutting depth adjustment locking mechanism, and the cutting depth adjustment locking mechanism has a simple structure and is convenient and easy to operate. DRAWINGS

1 is a schematic perspective structural view of an embodiment of the present invention in an unoperated state;

2 is a schematic perspective view showing the working state of an 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 and FIG. 2, the hand-held circular saw cutting depth adjustment locking mechanism comprises a housing 1 in which each component constituting a circular saw is provided, and the housing 1 can be divided into a handle for the operator to hold. The tail piece and the working head are held; the saw blade 2 is pivotally connected to the casing 1, a part of the saw blade 2 is located inside the casing 1, and the top end face of the casing 1 is partially exposed to facilitate the cutting operation.

One end of the shroud 3 is pivotally connected to the shaft 4 at the top of the casing, and a torsion spring (not shown) is sleeved on the shaft 4 to keep the shroud 3 away from work when the shroud 3 is free from external force. a head portion, so that the saw blade 2 is completely embedded in the shield 3; the other end portion of the shield 3 is provided with a limiting hole 5 corresponding to the limiting hole 5, and the housing 1 is provided with a stopper 6 The stopper 6 is received in the limiting hole so that the other end portion of the shield does not come off the housing 1. The end face of the shield 3 has an elongated hole 8 through which the saw blade 2 is passed.

The other end of the casing 1 adjacent to the shroud is provided with a scale ruler 7, the baffle 9 is disposed on the side of the scale scale 7, and the baffle 9 has an elongated slide hole 10 through which the bolt 11 is screwed. On the housing 1.

As shown in Figure 2, when working, loosen the bolts first, adjust the blank 9 to the corresponding scale of the scale 7 according to the depth to be cut, and then tighten the bolts 11 to lock the blank 9. When the power of the circular saw is turned on, the saw blade 2 rotates at a high speed. When the saw blade contacts the wooden board to be cut, the shield 3 rotates to expose the saw blade 2 to the shield 3, and when the other end of the shield 3 touches the shutter At 6 o'clock, the shield 3 can no longer continue to rotate. At this time, the size of the shield 2 exposed by the saw blade 2 is the same as the size of the shutter 9 on the scale scale 7, that is, the cutting depth of the saw blade 2.

Claims

Rights request

1. A hand-held circular saw cutting depth adjustment 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 (2) is exposed outwardly outside the working head;

a shield (3) movably disposed on the working head for enclosing the saw blade exposed to the working head

(2); the shield (3) has an elongated hole (8) for the saw blade (2) to be exposed to the shield (3);

It is characterized in that the housing (1) is provided with a locking mechanism that limits and positions the displacement of the shield (3).

2. The hand-held circular saw cutting depth adjustment locking mechanism according to claim 1, wherein the locking mechanism comprises a blocking piece (9) and a bolt (11), and the blocking piece (9) has a sliding hole ( 10), the bolt (11) is threadedly connected to the casing (1) through the sliding hole (10).

The hand-held circular saw cutting depth adjustment locking mechanism according to claim 2, characterized in that the housing is provided with a scale scale (7) capable of displaying the displacement of the flap (9).

A hand-held circular saw cutting depth adjustment locking mechanism according to claim 1, 2 or 3, wherein the end of said shield (3) is pivotally connected to the top of said housing by a shaft, and Between the shroud (3) and the casing (1) there is also provided an elastic member for the shroud (3) to be located away from the working head so that the saw blade (2) is contained within the shroud (3) .

The hand-held circular saw cutting depth adjustment locking mechanism according to claim 4, characterized in that the elastic member is a torsion spring sleeved on the shaft (4).

The hand-held circular saw cutting depth adjustment locking mechanism according to claim 4, wherein the housing (1) is provided with a stopper (6), and the other end of the shield (1) is provided The limiting hole (5) of the stopper (6) is accommodated.