CN203592794U - Intelligent marking dividing head - Google Patents
Intelligent marking dividing head Download PDFInfo
- Publication number
- CN203592794U CN203592794U CN201320831154.6U CN201320831154U CN203592794U CN 203592794 U CN203592794 U CN 203592794U CN 201320831154 U CN201320831154 U CN 201320831154U CN 203592794 U CN203592794 U CN 203592794U
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- Prior art keywords
- dividing head
- motor
- fluid cylinder
- chuck
- intelligent
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- 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 - Lifetime
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- 239000012530 fluid Substances 0.000 claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 210000000078 claw Anatomy 0.000 claims abstract description 21
- 230000033001 locomotion Effects 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical group C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model provides an intelligent marking dividing head which relates to the field of marking machines. The intelligent marking dividing head comprises a motor, a transmission mechanism, a rotation body, a box body, a chuck, a clamping claw, a connecting rod, a guiding pusher dog, a single-action fluid cylinder. The clamping claw is movable connected with the chuck. The connecting rod is movably connected with the clamping claw and the guiding pusher dog. The guiding pusher dog is fixed to the single-action fluid cylinder. The single-action fluid cylinder pushes the guiding pusher dog to do reciprocating motion. Under the action of the guiding pusher dog, the connecting rod drives the clamping claw to move radially along the chuck. The motor and the rotation body are connected with the transmission mechanism respectively. The rotation body is disposed in the box body. The chuck is fixed to the rotation body. The motor, under the transmission of the transmission mechanism, drives the rotator and the chuck to rotate. The intelligent marking dividing head is very convenient to conduct clamping operation and dividing operation in a vivid manner, can realize rapid intelligent dividing, can also realize revolution of a dividing shaft in a vertical plane, and is mainly applied to the field of marking by marking machines.
Description
Technical field
The utility model relates to a kind of numerical controlled machinery device, relates in particular to a kind of intelligent mark dividing head.
Background technology
What commonly use for the dividing head on marking machine at present is the mechanical universal dividing head of Purely mechanical, this indexing means calibration is mainly made up of index dial, handle and alignment pin, when this mechanical universal dividing head calibration, need to extract alignment pin swinging handle calibration, again alignment pin inserted to index hole and locks main shaft handle, although the higher operation of precision very bothers, being unfavorable for quick index, reduce productivity effect, be unfavorable for producing in enormous quantities product parts.And sub-degree angle is fixed, very inconvenient.And the clamp mechanism of this dividing head is also mechanical, clamp operation is very inconvenient.
Utility model content
For above-mentioned prior art, the technical problems to be solved in the utility model is to provide a kind of quick, intelligent calibration and clamp operation intelligent mark dividing head easily.
In order to solve the problems of the technologies described above, the utility model provides a kind of intelligent mark dividing head, comprises motor, transmission mechanism, turns, casing, chuck, claw, and claw is flexibly connected with chuck, also comprise connecting rod, lead cut somebody's hair, single-acting fluid cylinder; Described connecting rod is flexibly connected with leading to cut somebody's hair with described claw respectively, described lead to cut somebody's hair fix with described single-acting fluid cylinder, described in described single-acting fluid cylinder Work Promote, lead the straight reciprocating motion of cutting somebody's hair, described connecting rod drives described claw to move radially along described chuck described leading under the effect of cutting somebody's hair; Described motor is connected with described transmission mechanism respectively with turning, described in turn and be installed on described casing, described chuck with described in turn fixingly, described in described motor drives under the transmission of described transmission mechanism, turn and chuck rotation.This kind of intelligent mark dividing head adopts Electric Machine Control, can realize quick index and easy to operate.Adopt the control of single-acting fluid cylinder clamp or unclamp, clamp or unclamp the easy to operate of workpiece.
As further improvement of the utility model, described intelligent mark dividing head also comprises the stroke control mechanism of single-acting fluid cylinder, described stroke control mechanism comprise the adjustable plate fixing with described single-acting fluid cylinder, with described in the spacing collar of turning and being threaded, described spacing collar clamps described adjustable plate.
As further improvement of the utility model, described intelligent mark dividing head also comprises the stroke control mechanism of single-acting fluid cylinder, described stroke control mechanism comprises adjustable plate, bolt, described adjustable plate with described in turn fixing, described bolt is threaded with described adjustable plate, and described bolt and described single-acting fluid cylinder are hinged.
As further improvement of the utility model, described intelligent mark dividing head also comprises control system, described control system comprises button, single-chip microcomputer, relay, magnetic valve, power supply, display screen, drive circuit, described button, single-chip microcomputer, relay, magnetic valve is electrically connected successively, described button, single-chip microcomputer, drive circuit and motor are electrically connected successively, described display screen and button electrical connection, described magnetic valve and described single-acting fluid cylinder are tightly connected, described power supply is respectively to described button, single-chip microcomputer, relay, magnetic valve, display screen, drive circuit, motor power supply.
As further improvement of the utility model, described intelligent mark dividing head also comprises dial, mount pad and rotating shaft, and described dial and mount pad are fixed, and described rotating shaft is connected with described mount pad and casing respectively.
As further improvement of the utility model, described motor adopts stepper motor or servomotor.
As further improvement of the utility model, described transmission mechanism comprises pinion and gear wheel, and described pinion is fixedly connected with described motor, described gear wheel with described in turn and be fixedly connected with, described pinion and gear wheel are intermeshing.
As further improvement of the utility model, described transmission mechanism comprises small pulley, large belt wheel and belt, described small pulley is fixedly connected with described motor, described large belt wheel with described in turn and be fixedly connected with, described belt respectively with described small pulley and large belt wheel interlock.
As further improvement of the utility model, described single-acting fluid cylinder adopts single-acting cylinder or single-action hydraulic cylinder.
As further improvement of the utility model, described in turn and casing between be provided with rolling bearing.
Compared to prior art, intelligent mark dividing head of the present utility model adopts stepper motor or servomotor, and be provided with the control system that comprises button, single-chip microcomputer, drive circuit and display screen etc., easy to operate like this, directly perceived and can realize quick, intelligent calibration, can realize unspecified angle calibration.Adopt single-acting cylinder or single-action hydraulic cylinder, and be provided with the control system that comprises button, single-chip microcomputer, display screen, relay and magnetic valve etc., clamp like this or unclamp the easy to operate of workpiece.
Accompanying drawing explanation
Fig. 1 is embodiment one perspective view of the present utility model;
Fig. 2 is embodiment one stereochemical structure decomposing schematic representation of the present utility model;
Fig. 3 is embodiment two perspective view of the present utility model;
Fig. 4 is embodiment two stereochemical structure decomposing schematic representations of the present utility model;
Fig. 5 is embodiment three perspective view of the present utility model;
Fig. 6 is embodiment three stereochemical structure decomposing schematic representations of the present utility model;
Fig. 7 is embodiment four perspective view of the present utility model;
Fig. 8 is embodiment four stereochemical structure decomposing schematic representations of the present utility model;
Fig. 9 is control system block diagram of the present utility model.
In figure, each component names is as follows:
4--chuck
5--connecting rod
6--leads and cuts somebody's hair
7--single-acting fluid cylinder
8--stroke control mechanism
81--adjustable plate
82--spacing collar
83--turns
84--adjusting bolt
9--control system
91--magnetic valve
92--relay
93--single-chip microcomputer
94--power supply
95--button
96--drive circuit
97--display screen
10--motor
11--claw
12--transmission mechanism
121--pinion
122--gear wheel
123--small pulley
The large belt wheel of 124--
125--belt
13--casing
14--rolling bearing
15--mount pad
16--rotating shaft
17--dial
18--case lid
the specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further.
Embodiment one:
As shown in Figure 1 and Figure 2, a kind of intelligent mark dividing head comprise motor 10, transmission mechanism 12, turn 83, chuck 4, casing 13, case lid 18, rolling bearing 14, rotating shaft 16, mount pad 15, dial 17, stroke control mechanism 8, claw 11, connecting rod 5, lead cut somebody's hair 6, single-acting fluid cylinder 7, control system 9 etc.Motor 10 according to designing requirement should adopt can fine adjustment stepper motor or servomotor; Transmission mechanism 12 adopts belt transmission, comprises small pulley 123, large belt wheel 124 and belt 125; The rotating shaft of motor 10 is fixedly connected with small pulley 123 use keys or pin, large four or six screws of belt wheel 124 use are fixedly connected with 83 the one end of turning, separated by a distance between large belt wheel 124 and small pulley 123, belt 125 is sheathed on large belt wheel 124 and small pulley 123 and tightens.Chuck 4 is plate-like class parts, and centre is offered porose, and front is also provided with 2 to 6 claws, and 2 to 6 screws of chuck 4 use are fixed on 83 the other end of turning.Turn 83 for cylindrical parts part, centre is empty, and two rolling bearings 14 are arranged on respectively on the cylindrical at 83 the both ends of turning.Casing 13 is cylindrical parts part, and centre is empty, and an end is provided with ear's (not shown), and stepper motor or servomotor are arranged in ear, turns 83 to be arranged on together in casing 13 by two rolling bearings 14.Case lid 18 is disc plate pass class part, and centre has through hole, and case lid 18 adopts 4 to 6 screws and casing 13 to fix, and the two ends of casing 13 are respectively provided with case lid 18, and acting as of case lid 18 is dustproof.Chuck 4 is discoid class part, and center is through hole and is provided with the slope that holds connecting rod 5, and the front of chuck 4 offers 2 to 6 radial grooves, and groove dual-side is respectively provided with fin; Claw 11 is flat class part, is also provided with groove and coordinates with fin, and claw 11 is installed on groove and can moves radially along groove; Connecting rod 5 is flat shaft-like class part, and one end is flexibly connected with claw 11 by pin, and the other end is also 6 to be flexibly connected with leading to cut somebody's hair by pin; Lead and cut somebody's hair 6 for axial workpiece, one end is provided with mounting groove and is fixedly connected with the piston rod of single-acting fluid cylinder 7, and the other end is provided with 2 to 6 notches and is flexibly connected with connecting rod 5 by pin; Single-acting fluid cylinder 7 can adopt single-acting cylinder or single-action hydraulic cylinder, and tailpiece of the piston rod is fixedly connected with leading 6 the one end of cutting somebody's hair, and the other end can be fixed with screw and adjustable plate 81.Stepper motor or servomotor rotate under the control of control system 9, and the rotating shaft of motor 10 drives small pulley 123 to rotate, and small pulley 123 drives large belt wheel 124 to rotate by belt 125, and large belt wheel 124 drives 83 rotations of turning, thereby drives chuck 4 to rotate.Single-acting cylinder or single-action hydraulic cylinder are under the control of control system 9, piston rod straight reciprocating motion, piston rod drives and leads 6 motions of cutting somebody's hair, and leads 6 drive link 5 activities of cutting somebody's hair, thereby connecting rod 5 promotes claw 11 to be moved radially in the groove of chuck 4, and then realize claw 11 and clamp or unclamp workpiece.
As shown in Figure 1 and Figure 2, stroke control mechanism 8 comprises adjustable plate 81 and adjusting bolt 84, and adjustable plate 81 is tabular class part, and adjustable plate 81 is fixed on turns on 83 inwalls, adjusting bolt 84 is hinged through adjustable plate 81 and single-acting fluid cylinder 7, and adjusting bolt 84 and adjustable plate 81 are threaded.Workpiece has large and small, for the workpiece of the different sizes of clamping, can transfer adjusting bolt 84 with spanner makes single-acting cylinder or single-action hydraulic cylinder to assigned address, thereby regulate the stroke of the piston rod of single-acting cylinder or single-action hydraulic cylinder, by lead cut somebody's hair 6 and connecting rod 5 drive the open amplitude of claw 11 on chuck 4, and then can clamping the workpiece of different sizes.
As shown in Figure 1 and Figure 2, mount pad 15 is " U " Shape Parts, is formed by iron casting, and mount pad 15 both sides have two circular holes, and dial 17 is structure as a whole with mount pad 15, is arranged on the both sides of mount pad 15, and scale processes by groove.Rotating shaft 16 is axial workpiece, and casing 13 both sides have two circular holes, is connected and casing 13 16 rotations around the shaft by two rotating shafts 16 with mount pad 15.In the time that the part of processing is other bevelled situations such as taper shape, processed part, can be by the dial 17 on mount pad 15 not in level, rotates casing 13 and makes processed face in level.
As shown in Figure 9, this intelligence mark dividing head also comprises control system 9, and described electric machine control system 9 comprises button 95, single-chip microcomputer 93, drive circuit 96, display screen 97, power supply 94, relay 92, magnetic valve 91; Motor 10 according to designing requirement should adopt can fine adjustment stepper motor or servomotor; Described button 95, single-chip microcomputer 93, drive circuit 96 and stepper motor or servomotor are electrically connected successively, and described display screen 97 and button 95 are electrically connected, and described button 95, single-chip microcomputer 93, relay 92, magnetic valve 91 are electrically connected successively; Described power supply 94 is respectively to described button 95, single-chip microcomputer 93, drive circuit 96, display screen 97, relay 92, magnetic valve 91 and stepper motor or servomotor power supply.Lift an example below and illustrate that control system 9 controls the operation principle of calibration.Setting the large belt wheel 124 of transmission mechanism 12 and the gearratio of small pulley 123 is 1:4, suppose that processed workpiece will rotate 20 degree, large belt wheel 124 will rotate 20 degree, small pulley 123 will rotate 20X4=80 degree, stepper motor or servomotor will rotate 80 degree so, button 95 is inputted 20 degree, display screen 97 just shows 20 degree, the signal that single-chip microcomputer 93 receives 20 degree will convert the signal of 80 degree to and export to drive circuit 96, thereby drive circuit 96 Driving Stepping Motors or servomotor rotate 80 degree.Illustrate the operation principle of clamping below.Single-acting fluid cylinder 7 can adopt single-acting cylinder or single-action hydraulic cylinder, illustrates the operation principle that control system control 9 clamps below as an example of cylinder example, is equally applicable to single-action hydraulic cylinder.Magnetic valve 91 is also connected with single-acting cylinder 7, baric systerm hermetic seal respectively.When work, hand button 95, button 95 sends work order, single-chip microcomputer 93 receives command signal and sends control signal to relay 92, relay 92 receives signal and starts working, thereby magnetic valve 91 is started working, and then single-acting cylinder 7 starts working, by lead cut somebody's hair 6 and connecting rod 5 drive claw 11 to move radially on chuck 4 to realize and clamp or unclamp.Display screen shows ON or OFF.
Embodiment two:
As shown in Figure 3, Figure 4, embodiment two is substantially the same with embodiment one, and difference is stroke control mechanism 8 differences.2 spacing collars 82 that stroke control mechanism 8 in embodiment two adopts and adjustable plate 81, adjustable plate 81 is tabular class part, adopts screw and single-acting cylinder or single-action hydraulic cylinder to fix; Turn 83 for cylindric part, maximum outside diameter is provided with external screw thread, and is provided with the breach that holds adjustable plate, and the quantity of breach is 2 or 4, and one end is fixedly connected with chuck 4 by screw; Spacing collar 82 is circle shape part, inner ring is provided with the internal thread cooperatively interacting with 83 external screw threads of turning, spacing collar 82 quantity be two and before and after clamp adjustable plate 81, the external diameter of spacing collar 82 is also provided with and connects the screens of spanner, utilizes internal and external screw thread to coordinate to be tightened in turn on 83 by spanner.
Embodiment three:
As shown in Figure 7, Figure 8, embodiment three is substantially the same with embodiment one, and difference is transmission mechanism 12 differences.What the transmission mechanism 12 in embodiment three adopted is gear drive, adopt the large and small gear of pair of meshing, pinion 121 is fixedly connected with key or pin with the rotating shaft of stepper motor or servomotor, four or six screws of gear wheel 122 use are fixedly connected with 83 the one end of turning, and large and small gear is intermeshing.Enter motor or servomotor and rotate under the control of electric machine control system 9, the rotating shaft of motor 10 drives pinion 121 to rotate, and pinion 121 drives gear wheel 122 to rotate, and gear wheel 122 drives 83 rotations of turning, thereby drives chuck 4 to rotate.Lift an example below and illustrate that control system 9 controls the operation principle of calibration.Setting the gear wheel 122 of transmission mechanism 12 and the gearratio of pinion 121 is 1:4, suppose that processed workpiece will rotate 20 degree, gear wheel 121 will rotate 20 degree, pinion 121 will rotate 20X4=80 degree, stepper motor or servomotor will rotate 80 degree so, button 95 is inputted 20 degree, display screen 97 just shows 20 degree, the signal that single-chip microcomputer 93 receives 20 degree will convert the signal of 80 degree to and export to drive circuit 96, thereby drive circuit 96 Driving Stepping Motors or servomotor rotate 80 degree.
Embodiment four:
As shown in Figure 5, Figure 6, embodiment four is substantially the same with embodiment three, and difference is stroke control mechanism 8 differences.2 spacing collars 82 that stroke control mechanism 8 in embodiment four adopts and adjustable plate 81, adjustable plate 81 is tabular class part, adopts screw and single-acting cylinder or single-action hydraulic cylinder to fix; Turn 83 for cylindric part, maximum outside diameter is provided with external screw thread, and is provided with the breach that holds adjustable plate, and the quantity of breach is 2 or 4, and one end is fixedly connected with chuck 4 by screw; Spacing collar 82 is circle shape part, inner ring is provided with the internal thread cooperatively interacting with 83 external screw threads of turning, spacing collar 82 quantity be two and before and after clamp adjustable plate 81, the external diameter of spacing collar 82 is also provided with and connects the screens of spanner, utilizes internal and external screw thread to coordinate to be tightened in turn on 83 by spanner.
Above content is in conjunction with concrete preferred embodiment further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. an intelligent mark dividing head, comprises motor, transmission mechanism, turns, casing, chuck, claw, and claw is flexibly connected with chuck, it is characterized in that: also comprise connecting rod, lead cut somebody's hair, single-acting fluid cylinder; Described connecting rod is flexibly connected with leading to cut somebody's hair with described claw respectively, described lead to cut somebody's hair fix with described single-acting fluid cylinder, described in described single-acting fluid cylinder Work Promote, lead the straight reciprocating motion of cutting somebody's hair, described connecting rod drives described claw to move radially along described chuck described leading under the effect of cutting somebody's hair; Described motor is connected with described transmission mechanism respectively with turning, described in turn and be installed on described casing, described chuck with described in turn fixingly, described in described motor drives under the transmission of described transmission mechanism, turn and chuck rotation.
2. intelligent mark dividing head according to claim 1, it is characterized in that: described intelligent mark dividing head also comprises the stroke control mechanism of single-acting fluid cylinder, described stroke control mechanism comprise the adjustable plate fixing with described single-acting fluid cylinder, with described in the spacing collar of turning and being threaded, described spacing collar clamps described adjustable plate.
3. intelligent mark dividing head according to claim 1, it is characterized in that: described intelligent mark dividing head also comprises the stroke control mechanism of single-acting fluid cylinder, described stroke control mechanism comprises adjustable plate, bolt, described adjustable plate with described in turn fixing, described bolt is threaded with described adjustable plate, and described bolt and described single-acting fluid cylinder are hinged.
4. intelligent mark dividing head according to claim 1, it is characterized in that: described intelligent mark dividing head also comprises control system, described control system comprises button, single-chip microcomputer, relay, magnetic valve, power supply, display screen, drive circuit, described button, single-chip microcomputer, relay, magnetic valve is electrically connected successively, described button, single-chip microcomputer, drive circuit and motor are electrically connected successively, described display screen and button electrical connection, described magnetic valve and described single-acting fluid cylinder are tightly connected, described power supply is respectively to described button, single-chip microcomputer, relay, magnetic valve, display screen, drive circuit, motor power supply.
5. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described intelligent mark dividing head also comprises dial, mount pad and rotating shaft, described dial and mount pad are fixed, and described rotating shaft is connected with described mount pad and casing respectively.
6. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described motor adopts stepper motor or servomotor.
7. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described transmission mechanism comprises pinion and gear wheel, described pinion is fixedly connected with described motor, described gear wheel with described in turn and be fixedly connected with, described pinion and gear wheel are intermeshing.
8. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described transmission mechanism comprises small pulley, large belt wheel and belt, described small pulley is fixedly connected with described motor, described large belt wheel with described in turn and be fixedly connected with, described belt respectively with described small pulley and large belt wheel interlock.
9. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described single-acting fluid cylinder adopts single-acting cylinder or single-action hydraulic cylinder.
10. according to the intelligent mark dividing head described in claim 1 to 4 any one, it is characterized in that: described in turn and casing between be provided with rolling bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831154.6U CN203592794U (en) | 2013-12-14 | 2013-12-14 | Intelligent marking dividing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320831154.6U CN203592794U (en) | 2013-12-14 | 2013-12-14 | Intelligent marking dividing head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203592794U true CN203592794U (en) | 2014-05-14 |
Family
ID=50673707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320831154.6U Expired - Lifetime CN203592794U (en) | 2013-12-14 | 2013-12-14 | Intelligent marking dividing head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203592794U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103660634A (en) * | 2013-12-14 | 2014-03-26 | 欧阳庆丰 | Intelligent marking index head |
-
2013
- 2013-12-14 CN CN201320831154.6U patent/CN203592794U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103660634A (en) * | 2013-12-14 | 2014-03-26 | 欧阳庆丰 | Intelligent marking index head |
| CN103660634B (en) * | 2013-12-14 | 2016-04-27 | 湖南科技大学 | A kind of intelligent mark dividing head |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151110 Address after: 411101 No. 2 stone wharf, Yuhu District, Hunan, Xiangtan Patentee after: Hunan Sci-Tech Univ. Address before: 523085 No. 555, Liuzhou Road, Dongcheng District, Guangdong, Dongguan Patentee before: Ouyang Qingfeng |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140514 Effective date of abandoning: 20160427 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |