CN102393479A - Damage-prevention jig for needle changing in point measurement machine - Google Patents

Damage-prevention jig for needle changing in point measurement machine Download PDF

Info

Publication number
CN102393479A
CN102393479A CN2011102744629A CN201110274462A CN102393479A CN 102393479 A CN102393479 A CN 102393479A CN 2011102744629 A CN2011102744629 A CN 2011102744629A CN 201110274462 A CN201110274462 A CN 201110274462A CN 102393479 A CN102393479 A CN 102393479A
Authority
CN
China
Prior art keywords
connecting portion
protrusion
anchor clamps
point measurement
measurement machine
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.)
Granted
Application number
CN2011102744629A
Other languages
Chinese (zh)
Other versions
CN102393479B (en
Inventor
曾宇行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jingneng Optoelectronics Co ltd
Original Assignee
Lattice Power Jiangxi Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lattice Power Jiangxi Corp filed Critical Lattice Power Jiangxi Corp
Priority to CN201110274462.9A priority Critical patent/CN102393479B/en
Publication of CN102393479A publication Critical patent/CN102393479A/en
Application granted granted Critical
Publication of CN102393479B publication Critical patent/CN102393479B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • A Measuring Device Byusing Mechanical Method (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

The invention discloses a damage-prevention jig for needle changing in a point measurement machine and a needle changing method, which relate to an auxiliary accessory of the point measurement machine for performing a point measurement test on a light-emitting diode (LED) chip and the needle changing method, and are used for solving the problem of the damage to a sensor of an LED point measurement machine in the needle changing process. The jig comprises a fixture supporting body, an upper hanging body and a protrusion, wherein the fixture supporting body is used for supporting a fixture; the upper hanging body is hung on a spring-limiting front convex body on a spring permanent seat of the sensor; the protrusion is used for supporting against the position of the sensor above a movable contact body; the protrusion and the fixture supporting body are connected together through a transversal connecting part; the protrusion bulges from the surface of the transversal connecting part; the transversal connecting part and the fixture supporting body form a transversal flat part; the transversal connecting part is provided with the upper hanging body; the upper hanging body is connected with the transversal connecting part through a vertical connecting part; and the upper hanging body is provided with a force bearing part which is contacted with the spring-limiting front convex body. The damage-prevention jig for the needle changing in the point measurement machine is utilized to change a needle for the point measurement machine, thereby, the service life of the sensor can be obviously prolonged, and further, the production cost of an LED is reduced.

Description

Point measurement machine changes pin loss prevention tool
Technical field
The present invention relates to a kind of auxiliary accessories and a kind of needle method that changes that led chip is carried out some the point measurement machine of test.
Background technology
The structure of the sensor on the existing LED point measurement machine is as shown in Figure 3, and probe 1 is housed on this sensor, the consumptive material of probe 1 for almost all changing every day, and probe 1 is installed on the anchor clamps 2.After probe work a period of time, probe tip meeting loss, chap need to change.At present, when changing pin, need manual teardown anchor clamps 2, during, need with the finger holder below anchor clamps 2, to unclamp the screw 3 on the anchor clamps with screwdriver 17, from anchor clamps, take out probe 1.
This mode of getting probe is more extensive, is not easy control because finger is held the action of anchor clamps, damages movable contact body 4 and shell fragment 5 easily.Like Fig. 3, shell fragment 5 is fixed on the pedestal 7 through second screw 6, and shell fragment is fixed on the lever body 19 through the 3rd screw 8.Lever body 19 comprises parts such as plastic bar, wiring body, and it is a fulcrum with second screw 6, when anchor clamps 2 take place by faint rotating counterclockwise, (is that object to be tested rises; When contacting with needle point), the faint of respective angles will take place and clockwise rotate in movable contact body 4 simultaneously, because the upper prong of movable contact body 4 has the coat of metal that reduces contact resistance; And area is very little, frequent changing in the pin process, if the application of force is excessive; Can cause the acting force of upper prong and contact 9 of movable contact body excessive; Cause the destruction of the coating on movable contact body 4 and the contact 9, the destruction of coating can cause more emat sensor (Fig. 3 integral body is a sensor (except the probe 1)), perhaps makes shell fragment 5 distortion; Cause loose contact, also need more emat sensor.
Summary of the invention
First technical matters that the present invention will solve provides a kind of point measurement machine and changes pin loss prevention tool, and the sensor that is used for solving the LED point measurement machine is changing the damage problem of pin process to sensor.
Second technical matters to be solved by this invention provides the method that a kind of point measurement machine changes pin, and the sensor that is used for solving the LED point measurement machine is changing the pin process, unhandy problem.
For solving above-mentioned first technical matters; The present invention proposes a kind of point measurement machine and changes pin loss prevention tool, and it comprises: be used to hold anchor clamps the anchor clamps base body, hang over shell fragment on the shell fragment holder of sensor spacing before last hanging body and being used on the convex body withstand on the protrusion of the sensor site above the movable contact body;
Wherein, protrusion and anchor clamps base body link together through a horizontal connecting portion, and protrusion is by horizontal connecting portion rat, and laterally connecting portion and anchor clamps base body constitute horizontal flat part; Laterally be provided with hanging body on the connecting portion, last hanging body is connected with horizontal connecting portion through vertical connecting portion, and last hanging body has the load portion that contacts with the spacing preceding convex body of said shell fragment.
In order to solve above-mentioned second technical matters, the present invention proposes a kind of needle method that changes of point measurement machine sensor, and it comprises:
Before changing pin; Prepare earlier a kind of point measurement machine and change pin loss prevention tool, last hanging body before the shell fragment on the shell fragment holder that this tool comprises the anchor clamps base body that is used to hold anchor clamps, hang over sensor is spacing on the convex body and the protrusion that is used to withstand on the sensor site above the movable contact body;
Wherein, protrusion and anchor clamps base body link together through a horizontal connecting portion, and protrusion is by horizontal connecting portion rat, and laterally connecting portion and anchor clamps base body constitute horizontal flat part; Laterally be provided with hanging body on the connecting portion, last hanging body is connected with horizontal connecting portion through vertical connecting portion, and last hanging body has the load portion that contacts with the spacing preceding convex body of said shell fragment;
When changing pin, this tool is installed on the sensor, be about to said go up hanging body hang over shell fragment spacing before on the convex body, the anchor clamps base body is placed below the anchor clamps, said protrusion withstands on the sensor site of movable contact body top;
Then, with the screw on the instrument clamper for disassembling, at this moment, protrusion withstands on the sensor site of movable contact body top, and the movable contact body does not stress, shell fragment does not receive extra power; Anchor clamps base body support fixture, the further load deformation of control shell fragment can be changed pin after the knockout screw.
Preferably: the said hanging body of going up is a horizontal flat board.If xsect of the then vertical connecting portion of the words of monolateral assembling fixture, this horizontal dull and stereotyped and horizontal connecting portion forms shape; Can both assembling fixture if bilateral, then vertical connecting portion, this xsect laterally dull and stereotyped and laterally connecting portion form " worker " shape.Monolateral assembling fixture refers to, can only be from a side assembling fixture of sensor; Bilateral assembling fixture then refers to, can be from the both sides of sensor equal assembling fixture.
Preferably: said upward hanging body is with horizontal flat board, and said vertical connecting portion is located at the centre of this flat board.This structure is the structure of aforementioned said bilateral installation, can be from sensor left side assembling fixture, also can be from the sensor right side assembling fixture.So that a tool can adapt to the sensor that is contained in the left and right sides, improve the convenience that tool uses.
Preferably: the upper level of said anchor clamps base body is higher than the height of said horizontal connecting portion upper surface.This difference in height mainly is to hold anchor clamps in order to satisfy the anchor clamps base body, avoids having the gap between them, if there is the gap between them, then can make the anchor clamps base body undesirable to the support effect of anchor clamps, even slight vibration takes place.
Preferably: said tool is a plastic material.The convenient processing of plastic material in addition, can also be selected other material for use, like various materials such as aluminium, steel, copper, stainless steel and compound substances.
Preferably: the height of said protrusion is consistent with the height of contact, and it can just in time withstand on the contact.This is to guarantee that the movable contact body can be suspended in the protrusion inboard, makes it not bear supporting role, avoids it stressed.
Preferably: the height of said protrusion is consistent with the following height of punch block web member, its can just in time withstand on the punch block web member below.In conjunction with aforementioned structure, this shows that protrusion can be supported on the contact, also can be supported on the punch block web member.
Preferably: said horizontal coupling part is wide and narrow portion, and said protrusion is located on wide, and said vertical connecting portion is located on narrow, and narrow connects wide and anchor clamps base body.Can conveniently point for narrow and pinch tool, help changing the pin operation.In addition, finger position can also be set at the side of tool, and the surface sliding groove of setting up defences.
Beneficial effect of the present invention:
Compare prior art, the present invention has designed a kind of tool, and this tool is according to the sensor construction of LED point measurement machine; Be provided with three main bearing positions, promptly go up hanging body, anchor clamps base body and protrusion, it is through last hanging body; With anchor clamps base body stressed be transmitted to shell fragment spacing before on the convex body, the anchor clamps base body can be held anchor clamps like this, prevents that it from stressedly pressing down the stressed support of other end movable contact body that causes shell fragment; Be supported on contact or the punch block web member owing to protrusion in addition; It makes the movable contact body can be in vacant state, avoids the movable contact body to contact and collide with contact, is destroyed so prevented the coating on they top layers; Shell fragment does not receive extra uncertain pressure yet simultaneously, prevents its distortion.Utilize tool of the present invention, change pin to point measurement machine, can clearly reduce the destruction of the coating between movable contact body and the contact, prevent the shell fragment distortion, can prolong the serviceable life of sensor significantly, and then reduce the LED production cost by method of application.
Description of drawings
Fig. 1 is the structural drawing of tool of the present invention.
Fig. 2 is the construction profile of tool of the present invention.
Fig. 3 is the structural drawing of the sensor on the point measurement machine.
Fig. 4 is that first kind of tool is installed in the synoptic diagram on the sensor.
Fig. 5 is that second kind of tool is installed in the synoptic diagram on the sensor.
Fig. 6 be among Fig. 2 along A to view, this figure is a left view.
Fig. 7 is the structural drawing of other a kind of tool, and this figure is a left view.
Identifier declaration among the figure: probe 1, anchor clamps 2, screw 3, movable contact body 4, shell fragment 5, second screw 6, shell fragment holder 7, the 3rd screw 8, contact 9, go up hanging body 10, protrusion 11, laterally connecting portion 12, punch block web member 13, anchor clamps base body 14, vertical connecting portion 15, shell fragment spacing before convex body 16, screwdriver 17, lever body 19, load portion 1000, laterally flat part 1214, go up hanging body 10 ', protrusion 11 ', load portion 1000 '.
Embodiment
The present invention proposes a kind of point measurement machine and changes pin loss prevention tool, and it comprises: be used to hold anchor clamps the anchor clamps base body, hang over shell fragment on the shell fragment holder of sensor spacing before last hanging body and the protrusion that is used to withstand on the sensor site above the movable contact body on the convex body.Wherein, protrusion and anchor clamps base body link together through a horizontal connecting portion, and protrusion is by horizontal connecting portion rat, and laterally connecting portion and anchor clamps base body constitute horizontal flat part; Laterally be provided with hanging body on the connecting portion, last hanging body is connected with horizontal connecting portion through vertical connecting portion, and last hanging body has the load portion that contacts with the spacing preceding convex body of shell fragment.
Below through embodiment technical scheme of the present invention is described.
Anchor clamps base body 14 is used to hold anchor clamps, last hanging body 10 be used to hang over shell fragment on the shell fragment holder 7 of sensor spacing before on the convex body 16, protrusion 11 is used to withstand on sensor site above movable contact body 4.
Protrusion 11 links together through horizontal connecting portion 12 with anchor clamps base body 14, and protrusion 11 is by horizontal connecting portion 12 rats, and laterally connecting portion 12 constitutes horizontal flat part 1214 with anchor clamps base body 14.
Laterally be provided with hanging body 10 on the connecting portion 12, last hanging body 10 is a horizontal flat board.Last hanging body 10 is connected with horizontal connecting portion 12 through vertical connecting portion 15, and referring to Fig. 6, last hanging body 10 has the load portion 1000 that contacts with the spacing preceding convex body 16 of shell fragment.Referring to shown in Figure 7, the lower surface of last hanging body 10 ' has load portion 1000 ', hanging body undulate on this.The shape of last hanging body is not limit, as long as a bearing position that contacts with the spacing preceding convex body 16 of shell fragment is arranged.
In this example, last hanging body 10 is with horizontal flat board, and vertical connecting portion 15 is located at the centre of this flat board.Vertical connecting portion, this xsect laterally dull and stereotyped and laterally connecting portion form " worker " shape.Such structure both can hang up from spacing preceding convex body 16 left sides of shell fragment cover, can hang up from the right cover of the spacing preceding convex body 16 of shell fragment again.In another embodiment; Vertical connecting portion, this xsect laterally dull and stereotyped and laterally connecting portion form
Figure 33132DEST_PATH_IMAGE002
shape, and this monolateral mounting means can only be from a side assembling fixture of sensor.
Laterally coupling part 12 is wide 1200 and narrow 1201, and protrusion 11 is located on wide 1200, and vertical connecting portion 15 is located on narrow 1201, and narrow 1201 connects wide 1200 and anchor clamps base body 14.Can conveniently point for narrow 1201 and pinch tool, help changing the pin operation.In another embodiment, finger position can also be set at the side of tool, and the surface sliding groove of setting up defences.
As shown in Figure 2, the upper level of anchor clamps base body 14 is higher than the height of horizontal connecting portion 12 upper surfaces.This difference in height mainly is to hold anchor clamps in order to satisfy the anchor clamps base body, avoids having the gap between them, if there is the gap between them, then can make the anchor clamps base body undesirable to the support effect of anchor clamps, even slight vibration takes place.
Tool is a plastic material, and said tool is a plastic material.The convenient processing of plastic material in addition, can also be selected other material for use, like various materials such as aluminium, steel, copper, stainless steel and compound substances.
Referring to Fig. 4, the height of protrusion 11 is consistent with the height of contact 9, and it can just in time withstand on the contact 9.This is to guarantee that movable contact body 4 can be suspended in the protrusion inboard, makes it not bear supporting role, avoids it stressed.Referring to shown in Figure 5, in another embodiment, the height of protrusion 11 ' is consistent with the following height of punch block web member 13, its can just in time withstand on punch block web member 13 below, this situation, movable contact body 4 also can receive enough protections.
Use of the present invention is summarized as follows:
Use of the present invention relates to the needle method that changes that the present invention proposes a kind of point measurement machine sensor.
Referring to Fig. 4, before changing pin, be ready to above-mentioned point measurement machine earlier and change pin loss prevention tool.
When changing pin, this tool is installed on the sensor, to go up hanging body 10 hang over shell fragment spacing before on the convex body 16, with anchor clamps base body 14 place anchor clamps 2 below, protrusion 11 withstands on the contact 9 of movable contact body top.
Then, with the screw 3 on screwdriver 17 clamper for disassembling, at this moment, protrusion 11 withstands on the contact 9 of movable contact body top, and movable contact body 4 does not stress, and shell fragment 5 does not receive extra power.Anchor clamps base body 14 support fixtures 2, this moment, the rotation around second screw 6 can not take place in shell fragment, can change pin after the knockout screw 3.

Claims (10)

1. a point measurement machine changes pin loss prevention tool, it is characterized in that comprising: be used to hold anchor clamps the anchor clamps base body, hang over shell fragment on the shell fragment holder of sensor spacing before last hanging body and the protrusion that is used to withstand on the sensor site above the movable contact body on the convex body;
Wherein, protrusion and anchor clamps base body link together through a horizontal connecting portion, and protrusion is by horizontal connecting portion rat, and laterally connecting portion and anchor clamps base body constitute horizontal flat part; Laterally be provided with hanging body on the connecting portion, last hanging body is connected with horizontal connecting portion through vertical connecting portion, and last hanging body has the load portion that contacts with the spacing preceding convex body of said shell fragment.
2. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: the said hanging body of going up is a horizontal flat board.
3. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: the said hanging body of going up is that said vertical connecting portion is located at the centre of this flat board with horizontal flat board.
4. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: the upper level of said anchor clamps base body is higher than the height of said horizontal connecting portion upper surface.
5. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: said tool is a plastic material.
6. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: the height of said protrusion is consistent with the height of contact, and it can just in time withstand on the contact.
7. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: the height of said protrusion is consistent with the following height of punch block web member, its can just in time withstand on the punch block web member below.
8. point measurement machine according to claim 1 changes pin loss prevention tool, it is characterized in that: said horizontal coupling part is wide and narrow portion, and said protrusion is located on wide, and said vertical connecting portion is located on narrow, and narrow connects wide and anchor clamps base body.
A point measurement machine sensor change needle method, it comprises:
Before changing pin; Prepare earlier a kind of point measurement machine and change pin loss prevention tool, last hanging body before the shell fragment on the shell fragment holder that this tool comprises the anchor clamps base body that is used to hold anchor clamps, hang over sensor is spacing on the convex body and the protrusion that is used to withstand on the sensor site above the movable contact body;
Wherein, protrusion and anchor clamps base body link together through a horizontal connecting portion, and protrusion is by horizontal connecting portion rat, and laterally connecting portion and anchor clamps base body constitute horizontal flat part; Laterally be provided with hanging body on the connecting portion, last hanging body is connected with horizontal connecting portion through vertical connecting portion, and last hanging body has the load portion that contacts with the spacing preceding convex body of said shell fragment;
When changing pin, this tool is installed on the sensor, be about to said go up hanging body hang over shell fragment spacing before on the convex body, the anchor clamps base body is placed below the anchor clamps, said protrusion withstands on the sensor site of movable contact body top;
Then, with the screw on the instrument clamper for disassembling, at this moment, protrusion withstands on the sensor site of movable contact body top, and the movable contact body does not stress; Anchor clamps base body support fixture, the further load deformation of control shell fragment can be changed pin after the knockout screw.
10. point measurement machine sensor according to claim 1 change needle method, it is characterized in that: the said hanging body of going up is a horizontal flat board.
CN201110274462.9A 2011-09-16 2011-09-16 Damage-prevention jig for needle changing in point measurement machine Active CN102393479B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110274462.9A CN102393479B (en) 2011-09-16 2011-09-16 Damage-prevention jig for needle changing in point measurement machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110274462.9A CN102393479B (en) 2011-09-16 2011-09-16 Damage-prevention jig for needle changing in point measurement machine

Publications (2)

Publication Number Publication Date
CN102393479A true CN102393479A (en) 2012-03-28
CN102393479B CN102393479B (en) 2017-04-12

Family

ID=45860838

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110274462.9A Active CN102393479B (en) 2011-09-16 2011-09-16 Damage-prevention jig for needle changing in point measurement machine

Country Status (1)

Country Link
CN (1) CN102393479B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112475603A (en) * 2020-11-16 2021-03-12 深圳市大德激光技术有限公司 Laser welding head 3D collision avoidance device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101231964A (en) * 2007-01-23 2008-07-30 竑腾科技股份有限公司 Semiconductor component voltage stabilization testing method and testing tool
JP2009026566A (en) * 2007-07-19 2009-02-05 Advanced Systems Japan Inc Connecting method for contactor
CN101561451A (en) * 2008-04-17 2009-10-21 京元电子股份有限公司 Spring-type test holder and a sorter with same
CN201364346Y (en) * 2008-12-31 2009-12-16 晶能光电(江西)有限公司 Contact sensor accessory
CN101769946A (en) * 2008-12-31 2010-07-07 晶能光电(江西)有限公司 Needle change method of sensor on point measurement machine and needle changer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101231964A (en) * 2007-01-23 2008-07-30 竑腾科技股份有限公司 Semiconductor component voltage stabilization testing method and testing tool
JP2009026566A (en) * 2007-07-19 2009-02-05 Advanced Systems Japan Inc Connecting method for contactor
CN101561451A (en) * 2008-04-17 2009-10-21 京元电子股份有限公司 Spring-type test holder and a sorter with same
CN201364346Y (en) * 2008-12-31 2009-12-16 晶能光电(江西)有限公司 Contact sensor accessory
CN101769946A (en) * 2008-12-31 2010-07-07 晶能光电(江西)有限公司 Needle change method of sensor on point measurement machine and needle changer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112475603A (en) * 2020-11-16 2021-03-12 深圳市大德激光技术有限公司 Laser welding head 3D collision avoidance device
CN112475603B (en) * 2020-11-16 2021-06-22 深圳市大德激光技术有限公司 Laser welding head 3D collision avoidance device

Also Published As

Publication number Publication date
CN102393479B (en) 2017-04-12

Similar Documents

Publication Publication Date Title
CN100520343C (en) Cross point welding sample multidirectional fatigue loading fixture
CN201955219U (en) Testing device for static tension of wire harness terminal
CN104535414A (en) Shear test fixture
CN203333801U (en) Clamp
CN204818812U (en) Hub anchor clamps
ATE469096T1 (en) STABILIZING DEVICE FOR A HEAVY WORK VEHICLE
RU2007123527A (en) CONNECTOR FOR MECHANICAL AND ELECTRICAL CONNECTION OF ANODE WITH ANODE FRAME OF ELECTROLYZER FOR PRODUCTION OF ALUMINUM AND DEVICE FOR CAPTURE, CLAMPING AND DECLINING OF SUCH CONNECTOR
CN102393479A (en) Damage-prevention jig for needle changing in point measurement machine
CN205765042U (en) A kind of crankshaft drilling inclined oil hole of air fixture
CN104400695A (en) Parallel work-piece pressing device
CN104227860B (en) A kind of cylindrical silicon rod clamp
CN203266483U (en) V-type block supporting device
CN203542107U (en) Fast-changing production positioning device
CN205246439U (en) Tired anchor clamps of four -point bending of two spans
CN104029146B (en) The pressing clamp of Short Axis Kind pipe fitting
CN203745297U (en) Positioning structure for warp knitting fabric firmness testing device
CN107134375B (en) Circuit breaker maintenance contact
CN103753279A (en) Desk type clamp of ladder support
CN203875630U (en) Holddown clamp
CN211318153U (en) Bonding force positioning test fixture
CN101306528A (en) Circlip tongs
CN202419081U (en) Split quickly-replaceable sliding contact suspension device
CN102367912B (en) Split-type quick-change sliding suspension device
CN212459787U (en) Detection positioning mechanism of SMT tool
CN217096684U (en) A frock clamp for processing installation long plate connecting hole

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CP01 Change in the name or title of a patent holder

Address after: 330029 No. 699, aixihu North Road, high tech Zone, Nanchang City, Jiangxi Province

Patentee after: Jingneng optoelectronics Co.,Ltd.

Address before: 330029 No. 699, aixihu North Road, high tech Zone, Nanchang City, Jiangxi Province

Patentee before: LATTICE POWER (JIANGXI) Corp.

CP01 Change in the name or title of a patent holder