TWI407077B - Detecting apparatus - Google Patents

Detecting apparatus Download PDF

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Publication number
TWI407077B
TWI407077B TW98108111A TW98108111A TWI407077B TW I407077 B TWI407077 B TW I407077B TW 98108111 A TW98108111 A TW 98108111A TW 98108111 A TW98108111 A TW 98108111A TW I407077 B TWI407077 B TW I407077B
Authority
TW
Taiwan
Prior art keywords
detecting
hole
rod
fixing
workpiece
Prior art date
Application number
TW98108111A
Other languages
Chinese (zh)
Other versions
TW201033582A (en
Inventor
Bing-Jun Zhang
Original Assignee
Hon Hai Prec Ind Co Ltd
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 Hon Hai Prec Ind Co Ltd filed Critical Hon Hai Prec Ind Co Ltd
Priority to TW98108111A priority Critical patent/TWI407077B/en
Publication of TW201033582A publication Critical patent/TW201033582A/en
Application granted granted Critical
Publication of TWI407077B publication Critical patent/TWI407077B/en

Links

Abstract

A detecting apparatus for detecting linearity of a workpiece includes a platform, a slide rail vertically extending from the platform, two standard units slidably mounted to the slide rail, and a detecting unit. The detecting unit includes a fixed mount slidably mounted to the slide rail, a test dial indicator fixed to the fixed mount and having an extendable spindle, and a detecting bar slidably mounded to the fixed mount via a resilient member. The standard units are configured to abut against the workpiece to cooperatively define a detection reference. An end of the detecting bar is abutted against by the spindle of the test dial indicator, and the other end of the detecting bar is configured to contact the workpiece.

Description

Testing device
The present invention relates to a detecting device, and more particularly to a detecting device for detecting the straightness of a plate-like workpiece.
In the manufacturing process of information products such as desktop computers and portable electronic devices, it is necessary to detect the plate-like workpieces constituting the product casing. Among them, the detection of straightness has always been a difficult point in the detection. At the time of testing, the detection tool used is a three-dimensional or knife-edge ruler. For the three-dimensional element, the triggering principle is that the probe is triggered by force. The triggering force causes the workpiece, especially the thin-walled workpiece, to undergo large deformation under pressure. The deformation of the workpiece induced by such a detection tool can seriously affect the detection result. For the knife edge, it can only determine whether the workpiece is deformed, but the detection result is not quantified, and the amount of deformation cannot be known.
In view of the above, it is necessary to provide a detecting device that can quantify the detection result and can avoid deformation of the workpiece when detecting.
A detecting device for detecting straightness of a workpiece, comprising: a platform, a sliding rod vertically extending from the platform, two sliding reference members mounted on the sliding rod, and a detecting unit, wherein the detecting unit comprises a slidably a mounting bracket mounted on the slider, a measuring gauge fixed to the mounting bracket having an elastically expandable crown, and a detecting rod slidably mounted on the fixing bracket under elastic constraints, the two benchmarks The piece is used to abut against the workpiece to form a detection reference. The rod of the measuring table is abutted against one end of the detecting rod, and the other end of the detecting rod is used for abutting the workpiece.
Using the measurement table of the detecting unit of the above detecting device to quantify the detection result, and the design of the elastically expandable crown of the detecting unit and the detecting rod slidably mounted on the fixing frame under the elastic constraint makes the detecting rod always It expands and contracts with the undulation of the surface of the workpiece, thereby avoiding deformation of the workpiece during detection.
Referring to FIG. 1, a preferred embodiment of the detecting device of the present invention includes a support frame 10, two reference members 30, and a detecting unit 70.
The support frame 10 includes a platform 12 and a slide bar 14 extending vertically upward from the center of the platform 12. Four support columns 120 are provided below the platform 12. The slider 14 has a rectangular cross section.
Referring to FIG. 2 , the two reference members 30 are identical. Each of the reference members 30 includes a body 31 , a first positioning body 37 , and a second positioning body 39 .
The body 31 is generally a rectangular parallelepiped. A rectangular through hole 310 is formed in the middle of the body 31 through the top surface and the bottom surface thereof. One side of the body 31 defines a screw hole 312 that communicates with the through hole 310. A fixing piece 35 extends from the other side of the main body 31 opposite to the side, and a through hole (not labeled) is defined in the fixing piece 35. The body 31 defines two screw holes 314 at the other end opposite to the end.
The first positioning body 37 includes a flat elongated fixing portion 372 and a wedge-shaped positioning block 370. The positioning block 370 extends perpendicularly from one end of the fixing portion 372 near one end of the fixing portion 372, and one end away from the fixing portion 372 is a thinner tip 371. The fixing portion 372 defines two through holes 374 corresponding to the two screw holes 314 of the body 31. The two through holes 374 are respectively adjacent to a middle portion of the fixing portion 372 and an end of the fixing portion 372 away from the positioning block 370.
The second positioning body 39 includes a cylinder 390 and a semi-cylindrical (not labeled) extending from one end of the cylinder 390. The other end of the cylinder 390 defines a screw hole (not shown). The semi-cylindrical includes a circumferential side 394 and a flat side 396. The circumferential side portion 394 of the semi-cylindrical is partially cut away to form a bevel 391 such that the end of the semi-cylindrical portion forms a thinner tip end 392.
When the reference member 30 is assembled, the tip end 392 of the second positioning body 39 is moved away from the body 31, and a screw 398 is passed through the through hole of the fixing piece 35 of the body 31 and locked into the screw hole of the second positioning body 39 to be the second. The positioning body 39 is fixed to the body 31. The tip end 371 of the first positioning body 37 is separated from the body 31, and the two screws 376 are respectively passed through the through holes 374 of the first positioning body 37 and locked into the corresponding screw holes 314 of the body 31 to fix the first positioning body 37 to the body. 31, and the positioning block 370 of the first positioning body 37 is collinear with the second positioning body 39. A manual screw 33 is inserted through the screw hole 312. Thus, after the reference member 30 is sleeved on the slide bar 14, the operator can fix the reference member 30 to any position on the slide bar 14 by operating the manual screw 33.
Referring to FIG. 3 , the detecting unit 70 includes a measuring table 72 , a table 74 of a fixed measuring table 72 , a fixing bracket 76 , a fixing body 78 fixed to the fixing bracket 76 , a blocking piece 75 , a spring 73 and A test stick 79.
In the present embodiment, the measurement table 72 is a dial indicator. A fixing portion 720 is protruded from one side of the measuring table 72, and an elastically expandable watch rod 722 extends from the fixing portion 720.
The watch frame 74 includes a body 740 in the shape of a "ㄈ" and two fixed legs 746 extending perpendicularly from opposite ends of the arms of the body 740. A through hole 742 parallel to the two arms is defined in the main body 740, and a screw hole 744 communicating with the through hole 742 is vertically defined. A screw hole (not labeled) is formed on each of the fixing legs 746.
The flap 75 defines a hole 755 near one end thereof.
The holder 76 is substantially in the shape of a flat square and includes a first side 760 and a second side 762 adjacent to the first side 760. A receiving slot 764 is defined in the middle of the first side 760 , and the receiving slot 764 extends to the second side 762 . A square through hole 769 is defined in the groove wall of the receiving groove 764 parallel to the second side surface 762. The first side surface 760 defines two screw holes 766 respectively located on upper and lower sides of the receiving groove 764 and adjacent to the second side surface 762 . The second side 762 defines two screw holes 768 . The two screw holes 768 are respectively located on the upper and lower sides of the receiving groove 764 and adjacent to the first side 760 . The fixing bracket 76 has a vertical through hole 765 extending from the top to the bottom, and the through hole 765 is adjacent to a side opposite to the first side 760. A threaded through hole 767 communicating with the through hole 765 is defined in a side opposite to the first side 760. A manual screw 763 is threaded through the threaded through hole 767.
The fixing body 78 includes a vertical fixing plate 780 and a fixing block 782 protruding from the middle of the fixing plate 780. The fixing plate 780 defines two holes 784 on the two sides of the fixing block 782 corresponding to the screw holes 766 of the fixing frame 76. The fixing block 782 is provided with a transversely extending screw hole 786.
The detecting rod 79 includes a slider 791 and a probe 797. The slider 791 has a long strip shape and a square cross section. The slider 791 includes a first end and a second end opposite the first end. The slider 791 forms a stop flange 793 near the first end. The slider 791 defines a screw hole (not shown) at a first end thereof, and the slider 791 defines a screw hole 796 at a second end thereof. One end of the probe 797 extends out of a contact 798 having a surface that is part of a spherical surface. The other end of the probe 797 is provided with a threaded post (not labeled). The probe 797 is coupled to the first end of the slider 791 through the engagement of the threaded post with the screw hole of the first end of the slider 791. Since the probe 797 is detachably mounted to the slider 791 through a threaded engagement, the probe 797 is replaceable and replaceable, and the operator can use different types of probes according to the detection needs.
When the detecting unit 70 is assembled, the second end of the detecting rod 79 passes through the through hole 769 of the fixing bracket 76 and protrudes into the receiving groove 764. The spring 73 is sleeved on a portion of the detecting rod 79 located in the receiving groove 764. With a screw 77 passing through the hole 755 of the blocking piece 75 and locking into the screw hole 796 of the detecting rod 79, the blocking piece 75 is locked to the second end of the detecting rod 79, so that the two ends of the spring 73 are respectively elastically abutted against The corresponding groove wall of the receiving groove 764 and the blocking piece 75. The end of the blocking piece 75 away from the hole 755 thereof extends from the receiving groove 764. The two screws 788 respectively pass through the holes 784 of the fixing body 78 and are locked into the corresponding screw holes 766 of the fixing bracket 76, thereby fixing the fixing body 78 to the first side 760 of the fixing bracket 76. The fixing block 782 of the fixing body 78 is located outside the receiving groove 764, and the portion of the blocking piece 75 outside the receiving groove 764 abuts on the side of the fixing block 782 near the contact head 798 of the detecting rod 79. A fine adjustment screw 80 is passed through the screw hole 786 of the fixing body 78 from the other side of the fixing block 782. The two screws 745 are respectively inserted into the screw holes 768 of the fixing bracket 76 through the screw holes of the fixing legs 746 of the watch frame 74, thereby fixing the watch frame 74 to the second side surface 762 of the fixing frame 76. A sleeve 724 having a slot formed in a side wall is sleeved on the fixing portion 720 of the measuring table 72. The rod 722 and the fixing portion 720 of the measuring table 72 pass through the through hole 742 of the table frame 74, so that the sleeve 724 is received in the table. The through hole 742 of the frame 74 is inside. The crown 722 is elastically abutted against the nut of the screw 77 fixed to the flap 75. A screw 71 passes through the screw hole 744 of the watch frame 74 against the sleeve 724, and presses the sleeve 724 to contract the slot thereof to fasten the fixing portion 720 to the sleeve 724, thereby tightening the measuring table 72 Fastened to the watch frame 74. Among them, the sleeve 724 is used to protect the fixing portion 720 so as not to be directly pressed by the screw 71. The stopper flange 793 of the detecting rod 79 serves to prevent the detecting rod 79 from being completely retracted into the receiving groove 764 of the holder 79 and coming off.
When the detecting device of the present invention is assembled, a reference member 30 is slidably sleeved through the through hole 310 of the body 31 to the slider 14 of the support frame 10, and the detecting unit 70 is slidably passed through the through hole 765 of the fixing frame 76. The slide bar 14 is sleeved on the slide bar 14 , and the other reference member 30 is slidably sleeved on the slide bar 14 through the through hole 310 of the body 31 , and the semi-cylindrical side of the second positioning body 39 of the two reference members 30 is disposed. The portions 396 are opposite each other, and the first positioning body 37 of the two reference members 30 and the contact head 798 of the detecting unit 70 are located on the same side of the slide bar 14.
In use, the two reference members 30 are fixed at a desired height by hand screws 33 depending on the size of the workpiece to be tested. In addition, the detecting unit 70 can be fixed at a certain height by means of a manual screw 763. The detecting device of the present invention can be used to detect the straightness of a plate-like workpiece or a workpiece having a hemming. Here, a method of using the detecting device of the present invention will be described by taking a rectangular plate-like workpiece 100 having a hem 101 (see Fig. 5) as an example.
Referring to FIG. 4, one embodiment of detecting the workpiece 100 using the detecting device of the present invention is to position the workpiece 100 using the first positioning body 37 of the two reference members 30, and then use the detecting unit 70 to detect the workpiece 100. The specific operation method is as follows.
Before the detection, the detecting unit 70 is calibrated so that the contact head 798 of the detecting rod 79 is collinear with the tip end 371 of the first positioning body 37 of the two reference members 30. At the time of adjustment, the amount of protrusion of the detecting rod 79 with respect to the fixing frame 76 can be adjusted by rotating the fine adjustment screw 80. After the adjustment, one side edge of the workpiece 100 is attached to the platform 12 to cause the workpiece 100 to stand up. The side of the workpiece 100 without the hem 101 is directed toward the tips 371 of the two first positioning bodies 37. The straight line where the tips 371 of the two first positioning bodies 37 are located forms the detected reference line, and the tips 371 of the two first positioning bodies 37 abut against the upper and lower edges of the workpiece 100, respectively. The workpiece 100 is supported to prevent it from falling over. The detecting unit 70 is slid along the slide bar 14. Since the detecting rod 79 is always under the elastic constraint of the spring 73, the contact head 798 of the detecting rod 79 is always in contact with the surface of the workpiece 100 and the amount of protrusion of the detecting rod 79 relative to the fixing frame 76 is undulating with the surface of the workpiece 100. And change. Since the crown 722 of the measuring table 72 is elastically stretchable and always abuts against the screw 77 fixed to the detecting rod 79, the crown 722 expands and contracts as the detecting rod 79 expands and contracts. Therefore, the amount of expansion and contraction of the crown 722 of the measuring table 72 can be expressed from the dial of the measuring table 72, so that the operator can know the offset of the measured point on the surface of the workpiece 100 with respect to the reference line, thereby knowing the workpiece 100. Straightness.
With continued reference to FIG. 5, another embodiment of positioning the workpiece 100 using the detecting device of the present invention is to position the workpiece 100 using the second positioning body 39 of the two reference members 30, and then use the detecting unit 70 to detect the workpiece 100. Before the test, a reference member 30 and the detecting unit 70 are detached and reinstalled to the sliding bar 14 so that the second positioning body 39 of the two reference members 30 and the contact head 798 of the detecting unit 70 are located at the same position of the sliding bar 14. side. The detecting unit 70 is calibrated such that the contact head 798 of the detecting rod 79 is collinear with the tip end 392 of the second positioning body 39 of the two reference members 30. A corner of the workpiece 100 is attached to the platform 12. The two corners of the side of the workpiece 100 on which the flange 101 is provided are respectively engaged on the cylindrical surfaces of the two second positioning bodies 39, and the tips 392 of the two second positioning bodies 39 are abutted against the corresponding faces of the workpiece 100. The straight line where the tips 392 of the two second positioning bodies 39 are located forms the detected reference line. Then, the measurement table 72 of the detecting unit 70 can be used to know the straightness of the surface of the workpiece 100 on the diagonal.
The tip end 371 of the first positioning body 37 and the tip end 392 of the second positioning body 39 should be as flat and thin as possible to reduce the contact area with the workpiece 100 while achieving the positioning reference, so that the tips 371, 392 abut. The amount of deformation of the workpiece 100 generated by the workpiece 100 is reduced as much as possible, thereby improving the accuracy in detecting the workpiece 100. The spherical design of the contact head 798 of the detecting unit 70 causes the contact head 798 to be in point contact with the workpiece 100 to ensure detection accuracy.
Since the two first positioning bodies 37 of the detecting device of the present invention are used independently of the two second positioning bodies 39. Therefore, in other embodiments, the first positioning body 37 or the second positioning body 39 on the two reference members 30 can be omitted.
In addition, the first positioning body 37 and the second positioning body 39 of the reference member 30 are designed to be detachable with respect to the body 31 in order to replace the first positioning body 37 and the second positioning body 39 to cope with different shapes. The inspection of the size of the workpiece is required.
In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.
10‧‧‧Support frame
12‧‧‧ platform
120‧‧‧Support column
14‧‧‧ Slider
30‧‧‧ benchmark
31‧‧‧Ontology
310‧‧‧through hole
312‧‧‧ screw hole
314‧‧‧ screw hole
33‧‧‧Hand screws
35‧‧‧Fixed tablets
37‧‧‧First locator
370‧‧‧ Positioning block
371‧‧‧ tip
372‧‧‧Fixed Department
374‧‧‧through hole
376‧‧‧ screws
39‧‧‧Second locator
390‧‧‧Cylinder
391‧‧‧Bevel
392‧‧‧ tip
394‧‧‧Circular side
396‧‧‧ flat side
398‧‧‧ screws
70‧‧‧Detection unit
71‧‧‧ screws
72‧‧‧Measurement
720‧‧‧ Fixed Department
722‧‧‧ watch pole
724‧‧‧ bushing
73‧‧‧ Spring
74‧‧‧Table frame
740‧‧‧ Subject
742‧‧‧through hole
744‧‧‧ screw holes
745‧‧‧ screws
746‧‧‧Fixed feet
75‧‧‧Block
755‧‧‧ hole
76‧‧‧ Fixing frame
760‧‧‧ first side
762‧‧‧ second side
764‧‧‧ housing trough
765‧‧‧through hole
766‧‧‧ screw holes
767‧‧ Threaded through hole
768‧‧‧ screw hole
769‧‧‧through hole
77‧‧‧ screws
78‧‧‧Fixed body
780‧‧‧ fixing plate
782‧‧‧Fixed block
784‧‧‧ hole
786‧‧‧ screw hole
788‧‧‧screw
79‧‧‧Detector
791‧‧‧Slider
793‧‧‧stop flange
796‧‧‧ screw holes
797‧‧‧ probe
798‧‧‧Contact head
80‧‧‧ fine adjustment screw
100‧‧‧Workpiece
101‧‧‧Folding
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of a detecting device of the present invention.
Figure 2 is an exploded perspective view of the reference member of Figure 1.
Figure 3 is an exploded perspective view of the detecting unit of Figure 1.
Figure 4 is a perspective view of the detecting device of Figure 1 when a workpiece is positioned.
Figure 5 is a perspective view of the detecting device of Figure 1 when the workpiece is positioned in another manner.
10‧‧‧Support frame
12‧‧‧ platform
120‧‧‧Support column
14‧‧‧ Slider
30‧‧‧ benchmark
70‧‧‧Detection unit
73‧‧‧ Spring
76‧‧‧ Fixing frame
797‧‧‧ probe
798‧‧‧Contact head
80‧‧‧ fine adjustment screw

Claims (12)

  1. A detecting device for detecting straightness of a workpiece, comprising: a platform, a sliding rod vertically extending from the platform, two sliding reference members mounted on the sliding rod, and a detecting unit, wherein the detecting unit comprises a slidably a mounting bracket mounted on the slider, a measuring gauge fixed to the mounting bracket having an elastically expandable crown, and a detecting rod slidably mounted on the fixing bracket under elastic constraints, the two benchmarks The piece is used to abut against the workpiece to form a detection reference. The rod of the measuring table is abutted against one end of the detecting rod, and the other end of the detecting rod is used for abutting the workpiece.
  2. The detecting device of claim 1, wherein each of the reference members includes a body that is slidably mounted on the sliding bar, the body defines a through hole, and the body is sleeved on the sliding bar through the through hole thereof. One side of the body defines a screw hole communicating with the through hole, and a manual screw is disposed through the screw hole for abutting the sliding rod.
  3. The detecting device of claim 2, wherein each of the reference members comprises a positioning body detachably mounted on the body, the positioning body comprises a wedge-shaped positioning block, and each positioning block is away from each other One end of the respective body forms a flat and thin tip for contacting the workpiece.
  4. The detecting device of claim 2, wherein each of the reference members comprises a positioning body detachably mounted on the body, the positioning body is cylindrical, and each positioning body is at an end away from the corresponding body. A flat, thin tip for contacting the workpiece is formed.
  5. The detecting device according to any one of claims 1 to 4, wherein the end of the detecting rod for abutting the workpiece forms a contact head whose surface is a part of a spherical surface.
  6. The detecting device of claim 5, wherein the fixing frame of the detecting unit has a flat square shape, and the fixing frame has a through hole extending from the top to the bottom, and the fixing frame is sleeved through the through hole Slider.
  7. The detecting device of claim 6, wherein a threaded through hole communicating with the through hole is formed on one side of the fixing frame of the detecting unit, and a manual screw is inserted through the threaded through hole for abutting Top the slider.
  8. The detecting device of claim 7, wherein the fixing frame of the detecting unit comprises a first side opposite to a side of the threaded through hole and a second side adjacent to the first side, the first A receiving slot is defined in the side, the receiving slot extends to the second side, and a through hole is defined in the slot of the receiving slot parallel to the second side, and the detecting rod of the detecting unit is slidably mounted in the slot of the receiving slot The through hole of the wall is partially received in the receiving groove of the fixing frame, and one end of the detecting rod for abutting the workpiece protrudes from the fixing hole of the groove wall of the receiving groove.
  9. The detecting device of claim 8, wherein the detecting rod of the detecting unit extends a stopper flange adjacent to an end thereof for abutting the workpiece, and the stopping flange can resist the fixing frame The outer side is for preventing the detecting rod from completely retracting into the receiving groove of the fixing frame.
  10. The detecting device of claim 9, wherein a spring is sleeved on the detecting rod of the detecting unit, and a screw hole is opened at one end of the detecting rod which is abutted by the rod of the measuring table, and a screw passes through A blocking piece is formed in the hole and locked into the screw hole of the detecting rod to fix the blocking piece to the detecting rod, and the two ends of the spring respectively abut against the blocking piece and the receiving groove of the fixing frame The groove wall of the hole.
  11. The detecting device of claim 10, wherein a fixing body is fixed to the first side of the fixing frame of the detecting unit, the fixing body defines a screw hole, and the blocking portion is in close proximity to the fixing body. One side of the spring, a fine adjustment screw is threaded from the other side of the fixing body to a screw hole of the fixing body for abutting against a portion of the blocking piece that abuts the fixing body to adjust the detecting rod relative to the The amount of extension of the holder.
  12. The detecting device of claim 11, wherein the detecting rod comprises a slider and a probe, the slider is slidably mounted in a through hole of the slot wall of the receiving slot, and the slider opens a screw hole, one end of the probe is provided with a threaded column that cooperates with the screw hole of the slider, and the contact head of the detecting rod is located at the other end of the probe.
TW98108111A 2009-03-12 2009-03-12 Detecting apparatus TWI407077B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW98108111A TWI407077B (en) 2009-03-12 2009-03-12 Detecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW98108111A TWI407077B (en) 2009-03-12 2009-03-12 Detecting apparatus

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Publication Number Publication Date
TW201033582A TW201033582A (en) 2010-09-16
TWI407077B true TWI407077B (en) 2013-09-01

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243052A (en) * 2011-04-15 2011-11-16 许晓华 Verticality detection apparatus
CN103292772A (en) * 2012-02-27 2013-09-11 鸿富锦精密工业(深圳)有限公司 Coaxiality detection device
CN102759322A (en) * 2012-07-18 2012-10-31 安徽池州家用机床股份有限公司 Testing device for checking verticality of workpieces

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217418A (en) * 1963-08-13 1965-11-16 Oscar H Wennerberg Radius inspection and layout device
US6195905B1 (en) * 1995-06-02 2001-03-06 Jerry W. Cole Method of verifying the straightness of the arbor of the table saw
TWI269026B (en) * 2005-02-01 2006-12-21 Mitac Int Corp Examining device
CN101319869A (en) * 2008-06-27 2008-12-10 苏州塞维拉上吴电梯轨道系统有限公司 Slide rail linearity testing apparatus
CN201199147Y (en) * 2007-12-25 2009-02-25 成都四方瑞邦测控科技有限责任公司 Instrument for checking steel rail straight degree of railway rail

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217418A (en) * 1963-08-13 1965-11-16 Oscar H Wennerberg Radius inspection and layout device
US6195905B1 (en) * 1995-06-02 2001-03-06 Jerry W. Cole Method of verifying the straightness of the arbor of the table saw
TWI269026B (en) * 2005-02-01 2006-12-21 Mitac Int Corp Examining device
CN201199147Y (en) * 2007-12-25 2009-02-25 成都四方瑞邦测控科技有限责任公司 Instrument for checking steel rail straight degree of railway rail
CN101319869A (en) * 2008-06-27 2008-12-10 苏州塞维拉上吴电梯轨道系统有限公司 Slide rail linearity testing apparatus

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