CN202028828U - Portable cutting tool - Google Patents
Portable cutting tool Download PDFInfo
- Publication number
- CN202028828U CN202028828U CN2011201273879U CN201120127387U CN202028828U CN 202028828 U CN202028828 U CN 202028828U CN 2011201273879 U CN2011201273879 U CN 2011201273879U CN 201120127387 U CN201120127387 U CN 201120127387U CN 202028828 U CN202028828 U CN 202028828U
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- guard shield
- pedestal
- depth
- cutting tool
- regulating plate
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Abstract
The utility model discloses a portable cutting tool which comprises a pedestal, a cutting blade, a shield, a depth adjusting plate, a locking mechanism and an adjustable spacer, wherein the pedestal is provided with a lower surface butted with a workpiece and an upper surface mounted with a drive mechanism; the cutting blade is driven by the drive mechanism; the shield covers partial cutting blade above the upper surface of the pedestal and one end of the shield is pivoted with the pedestal through a pivot shaft; the position of the cutting blade, opposite to the pedestal, can be changed by virtue of the pivoting of the pivot shaft relative to the pedestal; the depth adjusting plate is mounted on the pedestal; the shield and the depth adjusting plate are locked together by the locking mechanism; the adjustable spacer is arranged between the shield and the depth adjusting plate and is provided with a butting part butted with the depth adjusting plate and a bearing part born by the shield; and the bearing part has a structure which is matched with the shield and moves opposite to the shield so as to change the relative position between the depth adjusting plate and the shield. The spacing between the shield and the depth adjusting plate can be adjusted by the portable cutting tool through a simple structure.
Description
Technical field
The utility model relates to a kind of portable cutting tool that can regulate the interval between cutting blade guard shield and the depth-regulating plate easily.
Background technology
Existing various portable cutting tools are used for workpiece or material are cut.A lot of portable cutting tools have the depth of cut regulatory function.Particularly, the pivot axis that one end of the guard shield of cutting blade is wound perpendicular to the cutting blade plane supports pivotly, establish the depth-regulating plate that is parallel to the cutting blade plane near the guard shield other end, the other end of guard shield is adjustable to be fixed on the depth-regulating plate.Guard shield can be that rotation centerline rotates with above-mentioned pivot axis, the guard shield other end is fixed on the depth-regulating plate after turning to correct position.Reach the effect of the depth of cut of regulating cutting blade with this.For ease of regulating, there is certain clearance between guard shield sidewall and the depth-regulating plate, this gap is an important design parameter.
Above-mentioned gap will be eliminated after guard shield being locked on the depth-regulating plate.Guard shield or depth-regulating plate can be out of shape because of drawing displacement mutually when eliminated in the gap, thereby caused cutting blade to depart from its correct cutting planes, influenced cutting accuracy.
In order to reduce the error in the gap between guard shield and the depth-regulating plate, conventional notion is to improve the dimensional accuracy of each parts.Yet this can cause the manufacturing complexity of entire tool and cost to raise.
Therefore, make the adjustable gaps between guard shield and the depth-regulating plate become another kind of the selection.For this reason, there are various technology to be suggested.For example, two one of parts that are pivoted relative to each other that are used to regulate the pivotal axis of depth of cut can be moved along its pivot axis direction, referring to JP2006346909A, JP2008080488A.In this way, the actual gap between guard shield and the depth-regulating plate can be adjusted to the expectation gap.
Yet, in portable cutting tool, most of functional parts such as cutting blade, guard shield, motor, motor cover all are by depth-regulating plate and the pivot bearings that is used to regulate depth of cut carries, therefore two one of parts that are pivoted relative to each other will carrying very heavy weight this pivotal axis move to accurate position along its pivot axis direction, are pretty troublesome things.In addition, owing to need transform and add new part, therefore, can increase manufacturing cost, and adjusting at interval need be finished by co-operating to different parts to the structure of pivotal axis.
Therefore, hope can solve the above-mentioned problems in the prior art.
The utility model content
The purpose of this utility model provides a kind of structure simple in structure, easy operating and realizes the cutting blade guard shield of portable cutting tool and the adjusting at the interval between the depth-regulating plate.
For this reason, the utility model provides a kind of portable cutting tool, and it comprises: pedestal, be tabular, and have against the lower surface of workpiece and the upper surface that driving mechanism is installed; By the cutting blade of described drive mechanism, cutting blade partly is positioned at the below of pedestal lower surface, and part is positioned at the top of pedestal upper surface; Cover the guard shield of the part cutting blade that is positioned at the pedestal upper surface top, an end and the pedestal of guard shield articulate by pivotal axis, and cutting blade can change with respect to the pedestal pivot by pivotal axis with guard shield with respect to the position of pedestal; Be installed in the depth-regulating plate on the pedestal; With the retaining mechanism that guard shield and depth-regulating plate are locked together, described retaining mechanism can stop guard shield to rotate relative to pedestal; But be provided with a control interval spare between described guard shield and the depth-regulating plate, this adjustable interval part has abutting part that is connected to depth-regulating plate and the supporting part that is carried by guard shield; Described supporting part have match with guard shield and with respect to the guard shield motion to change the structure of relative position between depth-regulating plate and the guard shield.In other words, described adjustable interval part has by the motion structure with respect to the relative position of guard shield motion change the between depth-regulating plate and the guard shield.
According to a kind of preferred implementation of the present utility model, described adjustable interval part has and is screw-type, wedge surface type or cam type motion structure.
According to a kind of preferred implementation of the present utility model, the supporting part of described adjustable interval part has is with the externally threaded face of cylinder, describedly is screwed together in the screwed hole in the guard shield with the externally threaded face of cylinder.
According to a kind of preferred implementation of the present utility model, described adjustable interval part has at least one pair of the parallel tabular surface that extends to supporting part from its abutting part.
According to a kind of preferred implementation of the present utility model, the sidewall of described guard shield has the thickening part, and described screwed hole is formed in the described thickening part.
According to a kind of preferred implementation of the present utility model, described retaining mechanism comprises lock-screw and check lock lever, and described lock-screw passes the endoporus of described adjustable interval part and is tightened in the screwed hole of check lock lever.
According to a kind of preferred implementation of the present utility model, described lock-screw has the cooperation section that cooperates with the endoporus of described adjustable interval part and is positioned at the thread segment that cooperates section the place ahead.
According to a kind of preferred implementation of the present utility model, described depth-regulating plate has the guide groove that extends along circular arc, and the thread segment of described lock-screw passes described guide groove and is screwed in the screwed hole of check lock lever.
According to a kind of preferred implementation of the present utility model, described depth-regulating plate is carried on the pedestal pivotally by the gyroaxis that is parallel to cutting tool cutting direction of advance.
According to a kind of preferred implementation of the present utility model, described portable cutting tool is an annular saw.
According to portable cutting tool of the present utility model, owing to adopted the adjustable interval part that to regulate the interval between guard shield and the depth-regulating plate, so that being regulated and maintain, the interval between guard shield and the depth-regulating plate make cutting blade by correct directed value, therefore, can guarantee the correct cutting operation of cutting tool.
In addition, according to portable cutting tool of the present utility model, owing to only adopted the adjustable interval part, and only by the single operation of this adjustable interval part just having been realized the adjusting of above-mentioned interval, therefore, the simple in structure and easy operating of portable cutting tool of the present utility model.
Therefore, the utility model provides a kind of selection that is highly profitable for the user.
Description of drawings
Fig. 1 is the perspective view of doing from the top according to a kind of portable cutting tool of the present utility model;
Fig. 2 is the transverse sectional view of doing towards depth-regulating plate of cutting tool shown in Figure 1;
Fig. 3 is the longitudinal sectional view of cutting tool shown in Figure 1, has shown a kind of form of retaining mechanism of the present utility model and adjustable interval part;
Fig. 4 is the local amplification view of being done around retaining mechanism shown in Figure 3 and adjustable interval part;
Fig. 5 is the amplification view of the lock-screw in the retaining mechanism shown in Figure 4;
Fig. 6 is the amplification view of adjustable interval part shown in Figure 4;
Fig. 7 and 8 is perspective views of the different angles of adjustable interval part shown in Figure 6.
The specific embodiment
Principle according to portable cutting tool of the present utility model is described with reference to the accompanying drawings.
The related portable cutting tool of the utility model can be the various instruments that workpiece is cut, for example annular saw, stone material cutter etc.Here, " workpiece " but be meant any bulk or tabular cutting material, for example timber, plastics, glass, metal or the like.
Cutting tool can be the band power line, so that utilize external power supply to carry out work; Also can be not to be with power line, thereby utilize self battery (for example rechargeable battery) to carry out work.
As shown in Figure 1, the portable cutting tool of example is an annular saw, and it comprises pedestal 3, this pedestal preferably by robust material for example metal make.In the embodiment shown in the figure, pedestal 3 is the form of essentially rectangular plate.Certainly, the pedestal of other shape also is feasible.
Cutting tool also comprises motor cover 2 and the guard shield 1 that is installed on the motor cover 2.The CD-ROM drive motor (not shown) is housed in motor cover 2.
Cutting tool comprises also by motor and is driving the cutting blade 5 of making cutting movement that it can be a for example saw blade of rotating blade, it will be appreciated, of course, that cutting blade also can be to move back and forth blade or the blade that can rotate and move back and forth simultaneously.
The part of the bottom of cutting blade 5 is passed the opening in the pedestal 3 and is exposed from the basal surface of pedestal, so that in the incision workpiece.
Cutting tool also comprises the bottom auxiliary shield 6 that covers cutting blade 5 bottoms.
When cutting operation, bottom guard shield 6 is cut the workpiece pushing and pressing and rotates in upper shroud 1, to expose the bottom of cutting blade 5 gradually.
In addition, be provided with the maintenance bar in the upper shroud 1, be used for bottom guard shield 6 is remained on upper shroud 1.Like this, at non-cutting operation state, bottom guard shield 6 can be by hand-turning in upper shroud 1 and be maintained at wherein, thus the bottom of exposing cutting blade 5.
The top of cutting blade 5 is covered by guard shield 1 all the time, thereby prevents that in cutting operation the smear metal that adheres on the blade from flying out and injure the operator.
Cutting tool also comprises angle adjustment plate 4 that is installed on pedestal 3 front portions and the depth-regulating plate 9 that is installed on pedestal 3 rear portions.
The front end of guard shield 1 is connecting angle adjustable plate 4 by pivotal axis 28, and this pivotal axis 28 has the pivot axis perpendicular to plane, cutting blade place.Pivot with respect to angle adjustment plate 4 around described pivot axis at pivotal axis 28 places by guard shield 1, can regulate the depth of cut in the cutting blade 5 incision workpiece; Then, utilize lock handle 18 that near the in its back-end side-walls of guard shield 1 is locked on the depth-regulating plate 9, the depth of cut of cutting blade just is fixed.
Angle adjustment plate 4 is installed in by swinging axle 22 on the holder 24 that is fixed on the pedestal 3, and this swinging axle 22 has the axis of oscillation that is parallel to cutting direction of advance F.Around described swinging axle 22 swings, can regulate the angle of inclination of cutting blade 5 by angle adjustment plate 4.Usually, cutting blade is perpendicular to pedestal 3, and promptly blade is perpendicular in the workpiece surface incision workpiece.Yet, sometimes need blade to cut in the workpiece at angle with respect to workpiece surface, can utilize this moment angle adjustment plate 4 that cutting blade is set in angle of inclination with respect to pedestal 3, then, utilize the lock-button 26 locking angle adjustment plates on the angle adjustment plate 4, determined the angle of inclination of cutting blade thus.
This angle adjustment plate and depth-regulating plate are commonly used in this area, and those skilled in the art envision their CONSTRUCTED SPECIFICATION easily.
Be equipped with on the motor cover 2 or be formed with operating grip 8.By means of this operating grip 8, can control cutting tool and carry out cutting operation.
As shown in Figure 2, the rectangular circular arc plate that depth-regulating plate 9 protrudes upward for the upper surface from pedestal 3, it has the construction section 14 that is installed on the pedestal 3.Construction section 14 can be the integral part on the depth-regulating plate 9, or independent element and being assembled on the depth-regulating plate 9.
Be formed with the guide groove that extends along circular arc in the depth-regulating plate 9, on the pivot axis that is centered close to pivotal axis 28 of this circular arc.
As shown in Figure 3, being fixed on lock-screw 30 on the sidewall of guard shield 1 passes this guide groove and is screwed into and be arranged in the check lock lever 10 of depth-regulating plate 9 on the side of guard shield.Have aforementioned lock handle 18 on this check lock lever 10.
Along with guard shield 1 pivots around pivotal axis 28, lock-screw 30 slides along this guide groove.According to the scale value on check lock lever 10 depth-regulating plates 9, can adjust the depth of cut of the cutting blade that needs.
Adjustable gaps in order to make between depth-regulating plate 9 and the guard shield 1 is provided with adjustable interval part 40 between the two.
A kind of exemplary adjustable interval part 40 of the present utility model has been shown among Fig. 6-8.This adjustable interval part is roughly cylindrical, is formed with external screw thread on its external cylindrical surface.Be provided with big footpath endoporus 41 and the path endoporus 42 coaxial in the adjustable interval part 40 with its external cylindrical surface, wherein big footpath endoporus 41 rear end faces from adjustable interval part 40 (being positioned at the end face of guard shield one side) extend to the adjustable interval part, path endoporus 42 extends to the adjustable interval part from the front end face (being positioned at the end face of depth-regulating plate one side) of adjustable interval part 40, and the two intersection produces step 43.
On the outer circumference surface of adjustable interval part 40, the direction from the front end face of adjustable interval part 40 towards rear end face produces excision portion, and back to tabular surface 44 to form pair of parallel at least but each other is used for by certain for example clamping such as spanner of adjustment means at interval.At this, although it may be noted that a pair of tabular surface 44 has been shown among Fig. 6-8, the quantity of tabular surface can be provided with as required, for example two pairs, three pairs or the like.
Referring to Fig. 5, wherein show the lock-screw 30 that is used with above-mentioned adjustable interval part 40.This lock-screw 30 is single-pieces of one, and comprises: be positioned at the nut portion 31 of rear end, the cooperation section 32 of extending forward from nut portion 31 is from the thread segment 34 that cooperates section 32 sizing reduction sections that stretch out forward 33 and stretch out forward from sizing reduction section 33.
Lock-screw 30 is suitable for inserting the adjustable interval part 40 from the rear end of adjustable interval part 40 as shown in Figure 4, so that cooperate section 32 to be arranged in the path endoporus 42 of adjustable interval part 40, nut portion 31 is arranged in big footpath endoporus 41.
According to a kind of preferred implementation, cooperate the peripheral dimension of section 32 or shape to be arranged to form tight fit, so that lock-screw 30 can rotate with adjustable interval part 40 with the internal diameter of path endoporus 42.
According to a kind of optional embodiment, the outer peripheral face of cooperation section 32 is by roughening or be provided with decorative pattern, so that have the frictional force of increase between the inner peripheral surface of the outer peripheral face of cooperation section 32 and path endoporus 42.
Certainly, it also is feasible producing matched in clearance between cooperation section 32 and the path endoporus 42.
The peripheral dimension of thread segment 34 is less than the internal diameter of path endoporus 42, so that thread segment 34 can freely pass path endoporus 42.The axial length of lock-screw 30 each sections is arranged so that, insert in the adjustable interval part 40 as shown in Figure 4 and the front end of nut portion 31 pushes away when being lower than on the step 43 at lock-screw 30, part or all of thread segment 34 can be exposed from the front end of adjustable interval part 40.
Sizing reduction section 33 has formed the transition that cooperates between section 32 and the thread segment 34.
Described adjustable interval part 40 is assemblied in the sidewall sections facing to depth-regulating plate 9 of guard shield 1 by its external screw thread.For this reason, formed thickening part 50, to improve the intensity of sidewall sections herein at this sidewall sections.
Be formed with the screwed hole of break-through in the thickening part 50, described adjustable interval part 40 is screwed in this screwed hole so that the front portion of adjustable interval part 40 from the thickening part 50 forward projection come out.Like this, the front end of adjustable interval part 40 push away be lower than depth-regulating plate 9 with guard shield facing to the surface, the tabular surface 44 of adjustable interval part 40 is exposed in the gap between guard shield 1 and the depth-regulating plate 9, as shown in Figure 4.
Lock-screw 30 inserts in the adjustable interval parts 40, so that cooperate section 32 to be placed in the path endoporus 42 in the modes that tight fit or matched in clearance cooperate, and nut portion 31 pushes away and is lower than on the step 43.In this state, the thread segment 34 of lock-screw 30 exposes from the front end of adjustable interval part 40, passes the circular arc guide groove in the depth-regulating plate 9, and is screwed in the screwed hole of check lock lever 10.By check lock lever 10 is tightened with respect to lock-screw 30, guard shield 1 can be locked on the depth-regulating plate 9.Lock-screw 30 and check lock lever 10 have constituted the retaining mechanism that guard shield and depth-regulating plate are locked together.
Can settle pad 38 between check lock lever 10 and the depth-regulating plate 9.
Before check lock lever 10 tightened with respect to lock-screw 30, can be by rotating the interval that adjustable interval part 40 changes between guard shield 1 and the depth-regulating plate 9.Particularly, can with the gap adjustment instrument for example spanner etc. be clamped on the tabular surface 44 of adjustable interval part 40, drive adjustable interval part 40 then by screw thread rotation, so that adjustable interval part 40 is with respect to sidewall (thickening part 50) the generation displacement of guard shield 1, promptly towards or deviate from depth-regulating plate 9 and move, change the gap between guard shield 1 and the depth-regulating plate 9 thus.Along with the rotation of adjustable interval part 40, whether observation or measurement cutting blade 5 be correct directed, for example whether is parallel to vertical (for example direction of longitudinal edge) of pedestal 3 by the plane of judging cutting blade 5 places.When confirming that cutting blade 5 is in correct orientation, check lock lever 10 is tightened with respect to lock-screw 30, the gap between guard shield 1 and the depth-regulating plate 9 promptly is maintained at the suitable values that make that cutting blade 5 is correctly directed at this moment.
Be appreciated that above-described screw-type adjustable interval part only is an example can regulating the parts at the interval between guard shield and the depth-regulating plate of the present utility model.The basic principle that the utility model is regulated the interval between guard shield and the depth-regulating plate is, adopt an adjustable interval part, it has abutting part (front portion) that is connected to depth-regulating plate and the supporting part (rear portion) that is carried by guard shield, change the abutting part of adjustable interval part and the distance between the guard shield by adjustable interval part (supporting part) with respect to guard shield motion (rotation, move or their combination), regulate the interval between guard shield and the depth-regulating plate thus.
Those skilled in the art can construct adjustable interval part miscellaneous under principle of the present utility model.For example, the adjustable interval part can adopt feasible structure on wedge surface type structure, cam type structure and other any kinematics.
According to the utility model, only need to adopt adjustable interval part and corresponding lock-screw, just can realize the interval adjusting between guard shield and the depth-regulating plate, and needn't transform and add new part this vitals of pivotal axis of guard shield.Therefore, the simple structure of cutting tool of the present utility model, and can reduce manufacturing cost.
In addition, according to the utility model, only need to rotate the adjustable interval part and just can realize that the interval between guard shield and the depth-regulating plate regulates, therefore cutting tool of the present utility model is easy and simple to handle, is easy to use.
Although describe specific implementations of the present utility model here in detail, they only provide for the purpose of explaining, and should not think that they are construed as limiting scope of the present utility model.Under the prerequisite that does not break away from the utility model spirit and scope, various replacements, change and transformation can be come out by conception.
Claims (10)
1. portable cutting tool comprises:
Pedestal is tabular, has against the lower surface of workpiece and the upper surface that driving mechanism is installed;
By the cutting blade of described drive mechanism, cutting blade partly is positioned at the below of pedestal lower surface, and part is positioned at the top of pedestal upper surface;
Cover the guard shield of the part cutting blade that is positioned at the pedestal upper surface top, an end and the pedestal of guard shield articulate by pivotal axis, and cutting blade can change with respect to the pedestal pivot by pivotal axis with guard shield with respect to the position of pedestal;
Be installed in the depth-regulating plate on the pedestal; With
With the retaining mechanism that guard shield and depth-regulating plate are locked together, described retaining mechanism can stop guard shield to rotate relative to pedestal;
It is characterized in that, but be provided with a control interval spare between described guard shield and the depth-regulating plate, this adjustable interval part has abutting part that is connected to depth-regulating plate and the supporting part that is carried by guard shield, described supporting part have match with guard shield and with respect to the guard shield motion to change the structure of relative position between depth-regulating plate and the guard shield.
2. portable cutting tool as claimed in claim 1 is characterized in that, the described structure of described adjustable interval part is screw-type, wedge surface type or cam type structure.
3. portable cutting tool as claimed in claim 1 is characterized in that, the supporting part of described adjustable interval part has is with the externally threaded face of cylinder, describedly is screwed together in the screwed hole in the guard shield with the externally threaded face of cylinder.
4. portable cutting tool as claimed in claim 3 is characterized in that, described adjustable interval part has at least one pair of the parallel tabular surface that extends to supporting part from its abutting part.
5. as claim 3 or 4 described portable cutting tools, it is characterized in that the sidewall of described guard shield has the thickening part, described screwed hole is formed in the described thickening part.
6. as claim 3 or 4 described portable cutting tools, it is characterized in that described retaining mechanism comprises lock-screw and check lock lever, described lock-screw passes the endoporus of described adjustable interval part and is tightened in the screwed hole of check lock lever.
7. portable cutting tool as claimed in claim 6 is characterized in that, described lock-screw has the cooperation section that cooperates with the endoporus of described adjustable interval part and is positioned at the thread segment that cooperates section the place ahead.
8. portable cutting tool as claimed in claim 7 is characterized in that, described depth-regulating plate has the guide groove that extends along circular arc, and the thread segment of described lock-screw passes described guide groove and is screwed in the screwed hole of check lock lever.
9. as each described portable cutting tool in the claim 1 to 4, it is characterized in that described depth-regulating plate is carried on the pedestal pivotally by the gyroaxis that is parallel to cutting tool cutting direction of advance.
10. as each described portable cutting tool in the claim 1 to 4, it is characterized in that described portable cutting tool is an annular saw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201273879U CN202028828U (en) | 2011-04-22 | 2011-04-22 | Portable cutting tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201273879U CN202028828U (en) | 2011-04-22 | 2011-04-22 | Portable cutting tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202028828U true CN202028828U (en) | 2011-11-09 |
Family
ID=44891140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201273879U Expired - Lifetime CN202028828U (en) | 2011-04-22 | 2011-04-22 | Portable cutting tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202028828U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102632280A (en) * | 2012-05-15 | 2012-08-15 | 庄永雷 | Hand-held cutting and milling machine |
| CN102744458A (en) * | 2011-04-22 | 2012-10-24 | 博世电动工具（中国）有限公司 | Portable cutting tool |
| CN103419068A (en) * | 2013-07-15 | 2013-12-04 | 江苏苏美达五金工具有限公司 | Portable handheld circular saw |
-
2011
- 2011-04-22 CN CN2011201273879U patent/CN202028828U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744458A (en) * | 2011-04-22 | 2012-10-24 | 博世电动工具（中国）有限公司 | Portable cutting tool |
| CN102744458B (en) * | 2011-04-22 | 2016-03-02 | 博世电动工具（中国）有限公司 | Portable cutting tool |
| CN102632280A (en) * | 2012-05-15 | 2012-08-15 | 庄永雷 | Hand-held cutting and milling machine |
| CN103419068A (en) * | 2013-07-15 | 2013-12-04 | 江苏苏美达五金工具有限公司 | Portable handheld circular saw |
| CN103419068B (en) * | 2013-07-15 | 2015-06-24 | 江苏苏美达五金工具有限公司 | Portable handheld circular saw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111109 Effective date of abandoning: 20160302 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |