CN2810159Y - Power tool brake device - Google Patents
Power tool brake device Download PDFInfo
- Publication number
- CN2810159Y CN2810159Y CN 200520113949 CN200520113949U CN2810159Y CN 2810159 Y CN2810159 Y CN 2810159Y CN 200520113949 CN200520113949 CN 200520113949 CN 200520113949 U CN200520113949 U CN 200520113949U CN 2810159 Y CN2810159 Y CN 2810159Y
- Authority
- CN
- China
- Prior art keywords
- brake
- throttle line
- guide pillar
- motion block
- power tool
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to a brake device for power tools, which mainly comprises a brake component, a bearing part, a pinion, a gear box, etc., wherein gasoline throttle lines are divided into a first gasoline throttle line and a second gasoline throttle line by the brake device, and a brake actuating block is connected between the first and the second gasoline throttle lines. The position of the brake actuating block is controlled by utilizing the gasoline throttle lines so as to drive a brake guide post and a brake steel belt to generate a brake function or a brake releasing function directly without an additional brake handle, a brake pivot-rotation component, etc. The brake device for power tools is simplified greatly in structure. The brake device for power tools can achieve the advantages of smaller number of the components, simple structure, modularization, reduced weight, manufacture cost reduction, etc. Simultaneously, because the brake function can be controlled synchronously by the tightness degree of the gasoline throttle lines, as long as the gasoline throttle is loosened by a user, the brake device for power tools brakes automatically without depressing the brake handle additionally. The brake device for power tools is quite convenient in operation.
Description
Technical field
The utility model relates to a kind of brake device of power tool.
Background technology
Known have many power tools, and gardening instrument such as portable mower for example, these power tools be with driven by engine one output shaft, and drive the instrument of being installed on the output shaft (for example saw blade, chain saw etc.).When engine stops start, though this moment, engine no longer provided any driving force to output shaft, because the inertia of output shaft still can make output shaft produce extra a bit of rotation.At this moment, be very sharp keen cutting tool as if what install on the output shaft, operating personnel are in case carelessness then probably meets accident, and the lighter additionally cuts to the position that is processing, and influences machining accuracy; The danger that operating personnel are hurt.
Therefore, for reducing the danger of power tool, develop the brake device of many power tools already, when stopping with convenient engine, operating personnel can stop output shaft by the effect of brake device at once.One " the safe brake device of desktop sawing machine " that disclose in No. 221936 case of Taiwan patent announcement, be winding one centrifugal device and a keep plate on the axle in motor case, utilize moving this brake body of centrifugal strip of this centrifugal device to contact generation brake effect with the bearing of motor output end.When motor power was turned off, motor rotary speed slowed down rapidly, and centrifugal force weakens, and contacted with this bearing so this centrifugal plate can drive this brake body, and produced the effect of friction brake, can motor spindle be stopped operating.
In No. 4793064 case of United States Patent (USP), disclose the brake device of power chain saw, wherein be provided with most correlated parts such as brake handgrip, brake pivot member, brake steel band, the user can be by depressing brake handgrip, make the brake steel band be close to output shaft, utilize the frictional force of brake steel band that output shaft is stopped.
The brake device of the power tool of being mentioned in the above-mentioned patent document rotates though can make output shaft stop inertia in the short time, has still generally that the part number is many, shortcomings such as complex structure, increase overall weight and manufacturing cost.And, in No. 4793064 case of United States Patent (USP),, stop the start of engine even the user decontrols throttle, still need to depress in addition the brake lever, the inertia that just can stop output shaft by this additional step rotates, and is relatively more inconvenient in the operation.Therefore, need a kind of operation brake device of power tool quite easily really, it has advantages such as simple in structure, that the part number is few, weight is light, cost is more cheap, and is easy to manufacture.
The utility model content
Because the problems referred to above are designed the utility model.The brake device of power tool of the present utility model, mainly comprise brake assembly, a bearing portion and a pinion, wherein this brake assembly comprises brake base, base upper cover, first throttle line, second throttle line, and motion block, brake guide pillar, spring, brake steel band and brake drum are made in throttle line briquetting, throttle line guide pillar, brake.Brake base and base upper cover are contained in the formed between the two space in order to the part with other in order to define the shell of whole brake assembly.One end of first throttle line is connected to carburetor, and its other end then is connected to brake and makes an end of motion block, and makes to be provided with between the motion block spring in first throttle line and brake.One end of second throttle line is connected to throttle, and its other end then is connected to the other end that motion block is made in this brake, makes the throttle line of winning, brake do to present straight line between motion block and the second throttle line three and connects.The profile design of making motion block of braking becomes to have two inclined-planes, can release very position generation in a brake position and with the brake guide pillar respectively and be close to.The brake guide pillar is connected to a brake steel band with the other end that brake contact as motion block, is arranged with a spring on this brake guide pillar, the Design of length one-tenth of the steel band of braking be enclosed in with being enough to tighten brake drum around, in order to stop the rotation of brake drum.
Under normal conditions, when the user did not refuel as yet, brake was made motion block and is in the brake position with the brake guide pillar, and the steel band of braking this moment is close to brake drum, so brake drum can't rotate.When the user desires tool using and spurs first throttle line when opening carburetor, then can drive brake and making motion block and second throttle line moves along the direction that first throttle line is pulled, and then open throttle simultaneously by second throttle line and refuel, when brake is moved as motion block, the brake guide pillar just moves to second inclined-plane along first inclined-plane that motion block is made in brake, make both enter and release very position, release in the evil spirit position at this, the brake guide pillar is squeezed, make the brake steel band of tightening unclamp, just discharged brake drum, brake drum can be rotated with output shaft, this moment is the working power instrument normally.
When the user unclamps first throttle line (that is closing carburetor), then because the restoring force of the spring that first throttle line and brake are done to exist between the motion block, forcing brake to make motion block and second throttle line moves along first throttle line recover the to brake direction of position, the brake guide pillar then moves back to first inclined-plane along second inclined-plane that motion block is made in brake, make both recover the position of braking, thus, the brake steel band surrounds brake drum once again with tightening, and stopped the rotation of brake drum, also stop the inertia of output shaft to rotate simultaneously.
According to above-mentioned, the utility model is by this brake device, throttle line is divided into first throttle line and second throttle line, connect brake in the middle of both and make motion block, utilize throttle line to control the position that motion block is made in brake, and then drive the brake guide pillar and the steel band of braking, directly produce braking action or release very effect, and do not need extra brake handgrip and parts such as brake pivot member etc., simplify manyly on the structure, can reach advantages such as few, the simple in structure modularization of number of parts, weight saving, manufacturing cost reduction.Simultaneously, because the tightness that braking action can be said so by throttle line carries out Synchronization Control, so as long as the user unclamps throttle, just brake does not automatically need additionally to depress the step of brake handgrip fully, and is quite convenient really in the operation.
Description of drawings
Fig. 1 is the stereo appearance figure of the utility model power tool.
Fig. 2 is a three-dimensional exploded view of the present utility model, shows the part assembling situation of the brake device of the utility model power tool.
Fig. 3 is the stereogram after the utility model primary clustering combination.
Fig. 4 is a plane of the present utility model, shows that the brake device of the utility model power tool is in the state of brake position, has wherein removed base upper cover so that observe.
Fig. 5 is planar gesture figure of the present utility model, shows that the brake device of the utility model power tool is in the state of releasing the evil spirit position, has wherein removed base upper cover so that observe.
Embodiment
Below, will be with reference to the accompanying drawings, describe the brake device of power tool of the present utility model in detail.
At first, with reference to figure 1 and Fig. 2, the brake device of power tool of the present utility model is divided into several sections basically: a brake assembly 100, bearing portion 200, a pinion 18, and gear-box 300.Brake assembly 100 comprises a base upper cover 1, brake steel band 2, two springs 3 and 3a, brake guide pillar 4, the major parts such as making motion block 5, first throttle line 8, second throttle line 13, throttle line briquetting 6, throttle line guide pillar 9, brake base 11 and brake drum 14 of braking.Base upper cover 1 and brake base 11 can be contained in other part in the formed between the two space in order to define the shell of whole brake assembly 100.
Bearing portion 200 comprises major parts such as a bearing plate 16, bearing 17 and pinion 18.Gear-box 300 comprises a gear-box loam cake 21, bearing 22, C type clasp 23, gear wheel 24, output shaft 25, eccentric block 27, pad 28 and gear-box lower cover 36.In Fig. 2 of the present utility model, as example, on output shaft 25, be assembled with a blade assembly 29 with a power saw.What know is the suitable instrument that output shaft 25 can be assembled other form, for example the saw blade or the rope etc. of mowing.And, because bearing portion 200 is not the feature that the utlity model has patentability with gear-box 300, can use other known structure, so in specification of the present utility model, omit the detailed description of bearing portion and gear-box.
Now, begin to illustrate the detailed structure of brake assembly 100.With reference to figure 3 and Fig. 4, Fig. 3 and Fig. 4 are respectively stereogram of the present utility model and plane, show that the utility model brake assembly 100 is in the state of brake position, has wherein removed base upper cover 1 so that observe.One end of first throttle line 8 is connected on the carburetor (not shown), and its other end then is connected to the end that motion block 5 is made in the 100 interior brakes of brake assembly by a spring 3a.Outside brake assembly 100, a throttle line guide pillar 9 and a nut 10 are set, make the throttle line 8 of winning can be immobilizated in brake assembly 100, and can move along the channeling direction of throttle line guide pillar 9.One end of second throttle line 13 is connected to the throttle (not shown), and its other end then is connected to the other end that motion block 5 is made in this brake, in brake assembly 100 a throttle line briquetting 6 is set, and makes second throttle line 13 can be immobilizated in brake assembly 100.Thus, first throttle line 8, brake are done just to present straight line between motion block 5 and second throttle line, 13 threes and are connected.The profile design that motion block 5 is made in brake becomes to have the first inclined-plane 5a and the second inclined-plane 5b, is called a brake position when the first inclined-plane 5a goes up when brake guide pillar 4 abuts against, and brake guide pillar 4 then is called when abutting against the second inclined-plane 5b releases very position.The end that the other end that motion block 8 contact is connected to a brake steel band 2 is made in brake guide pillar 4 and brake, and the other end of the steel band of braking then is fixed in the appropriate location on the base 11 of braking; Be arranged with a spring 3 on the brake guide pillar 4.The Design of length of brake steel band 2 become to be enclosed in with being enough to tighten brake drum 14 around, in order to stop the rotation of brake drum 14.
The start situation of brake assembly then, is described.As shown in Figure 4, when the user does not refuel as yet, that is first throttle line 8 when not being subjected to drawing, elastic force by spring 3 promotes brake guide pillar 4, the first inclined-plane 5a that motion block 5 is made in feasible brake is close to brake guide pillar 4 and is in the brake position, the steel band 2 of braking this moment is close to brake drum 14, so brake drum 14 can't rotate.With reference to figure 5, when the user spurs first throttle line 8 (that is opening carburetor), then can driving brake, to make the direction (being exactly the direction of arrow A among Fig. 4) that motion block 5 and second throttle line 13 be pulled along first throttle line 8 mobile, affects throttle to refuel by second throttle line 13; When brake is made motion block 5 and is moved, brake guide pillar 4 just moves to the second inclined-plane 5b along the first inclined-plane 5a that motion block 5 is made in brake, make both enter and release very position, release in the evil spirit position at this, brake guide pillar 4 is subjected to braking and does the extruding of motion block 5, makes the brake steel band of tightening 2 unclamp, and has just discharged brake drum 14, brake drum 14 can rotate freely with output shaft 25, and this moment is the working power instrument normally.
When the user unclamps first throttle line 8 (that is closing carburetor), then because the restoring force of the spring 3a of existence between the motion block 5 is made in first throttle line 8 and brake, forcing brake to make motion block 5 and second throttle line 13 and moving, allowing throttle also close thereupon along first throttle line 8 recover the to brake direction of positions; The second inclined-plane 5b that 4 of guide pillars of brake are made motion block 5 along brake moves back to the first inclined-plane 5a, spring 3 promotes brake guide pillar 4 again and makes the first inclined-plane 5a of motion block 5 to being close to brake, make both recover the position of braking, thus, brake steel band 2 surrounds brake drum 14 once again with tightening, and stopped the rotation of brake drum 14, also stop the inertia of output shaft 25 to rotate simultaneously.
According to above-mentioned, in the brake assembly of the present utility model, one throttle line is divided into 13 2 sections of first throttle line 8 and second throttle line, connect brake in the middle of both and make motion block 5, utilize throttle line to control the position that motion block 5 is made in brake, and then drive brake guide pillar 4 and brake steel band 2, directly produce braking action or release very effect, and do not need extra brake handgrip and parts such as brake pivot member etc., simplify manyly on the structure, can reach advantages such as few, the simple in structure modularization of number of parts, weight saving, manufacturing cost reduction.Simultaneously, because the tightness that braking action can be said so by throttle line carries out Synchronization Control, so as long as the user unclamps throttle, just brake does not automatically need additionally to depress the step of brake handgrip fully, and is quite convenient really in the operation.
Though according to the above embodiments the utility model is described, what know is to those skilled in the art, after reading announcement of the present utility model, still can visualize other modification and equivalent replacement.Therefore, scope of the present utility model should not limited to by above-mentioned certain embodiments, is only and should be defined in the claims.
Claims (7)
1. the brake device of a power tool, comprise a brake assembly, a bearing portion, a pinion and a gear-box, it is characterized in that: this brake assembly comprises a brake base, a base upper cover, first throttle line, second throttle line, and motion block, a brake guide pillar, a brake steel band and a brake drum are made in a brake; This brake drum is in conjunction with described pinion, and described pinion then is connected in described gear-box, and an end of described first throttle line is connected to a carburetor, and its other end then is connected to the end that motion block is made in brake in the described brake assembly by a spring; One end of second throttle line is connected to a throttle, and its other end then is connected to the other end that motion block is made in this brake, makes the throttle line of winning, brake do to present straight line between motion block and the second throttle line three and connects; The brake guide pillar is connected to this brake steel band with the other end that brake contacts as motion block, and the other end of brake steel band is fixed on described brake base, be arranged with a spring on the described brake guide pillar, the Design of length of described brake steel band become to be enclosed in with being enough to tighten brake drum around, in order to stop the rotation of brake drum, do relatively moving between motion block, the brake guide pillar, being close to or released state between controlled brake steel band and the brake drum by first throttle line, brake.
2. the brake device of power tool as claimed in claim 1, it is characterized in that: described brake base and described base upper cover are contained in the formed between the two space in order to the part with other in order to define a shell of this brake assembly.
3. the brake device of power tool as claimed in claim 1, it is characterized in that: a throttle line guide pillar and a nut are set outside described brake assembly, make described first throttle line can be immobilizated in described brake assembly, and can move along described throttle line guide pillar institute channeling direction.
4. the brake device of power tool as claimed in claim 1 is characterized in that: a throttle line briquetting is set in described brake assembly, makes described second throttle line can be immobilizated in described brake assembly.
5. the brake device of power tool as claimed in claim 1, it is characterized in that: the profile design that motion block is made in described brake becomes to have first inclined-plane and second inclined-plane, be called a brake position when the brake guide pillar abuts against on first inclined-plane, the brake guide pillar then is called when abutting against second inclined-plane releases very position.
6. the brake device of power tool as claimed in claim 1 is characterized in that: when described brake guide pillar was in the brake position, described brake steel band was tightened and is close to described brake drum, therefore stops the rotation of described brake drum.
7. the brake device of power tool as claimed in claim 1 is characterized in that: when described brake guide pillar is in when releasing very the position, can loosens described brake steel band and break away from described brake drum, therefore described brake drum is rotated freely.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520113949 CN2810159Y (en) | 2005-07-15 | 2005-07-15 | Power tool brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520113949 CN2810159Y (en) | 2005-07-15 | 2005-07-15 | Power tool brake device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2810159Y true CN2810159Y (en) | 2006-08-30 |
Family
ID=36936535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520113949 Expired - Fee Related CN2810159Y (en) | 2005-07-15 | 2005-07-15 | Power tool brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2810159Y (en) |
-
2005
- 2005-07-15 CN CN 200520113949 patent/CN2810159Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |