GB970309A - Improvements in or relating to an apparatus for measuring hardness - Google Patents
Improvements in or relating to an apparatus for measuring hardnessInfo
- Publication number
- GB970309A GB970309A GB4020361A GB4020361A GB970309A GB 970309 A GB970309 A GB 970309A GB 4020361 A GB4020361 A GB 4020361A GB 4020361 A GB4020361 A GB 4020361A GB 970309 A GB970309 A GB 970309A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slider
- diaphragm
- tip
- piece
- holder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/42—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
- G01N3/44—Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid the indentors being put under a minor load and a subsequent major load, i.e. Rockwell system
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
970,309. Hardness impact testing. A. ERNST. Nov. 9, 1961 [Nov. 9, 1960; Oct. 11, 1961], No. 40203/61. Heading G1S. In hardness-testing apparatus giving pre-load and main load of a penetrating member 1 in a single operating movement, the holder 2 for the tip 1 has a resilient portion 29<SP>1</SP> at its widened upper end for frictional engagement with a slider 3 integral with washers 17, 18 (to limit movement of the slider in co-operation with locking rings 19, 20) and a feeler 4 The latter bears against a disc 5 on a diaphragm 6 closing a fluid chamber communicating with a capillary indicating tube 9. The diaphragm-fluid chamber assembly (5-15) rests on a cylindrical body 23 narrowed at 24 and terminating in hood 44. Initially, the whole apparatus is held in the fully-raised position by spring 31, resting on a ring 25 engaged with the base 26, and acting on the casing 30. A pin 49 secured to a part 48 carried by pillars 56 extending (through suitable apertures) from ring 25, bears against the part 29 of the holder 2 to cause the tip 1 to protrude beyond hood 44 by a predetermined amount. As casing 30 (and thereby -the whole apparatus) is lowered using handles 46, the tip 1 engages the surface of the work-piece under a driving pressure due solely, in the first instance, to the frictional force on the part 29<SP>1</SP> as the slider 3 moves downwards. During this initial movement, the feeler 4 (and slider 3) rests on a cross-piece 16 supported on a sleeve 35. When hood 44 makes contact with the surface, the cylindrical body 23 is arrested and with it the diaphragm-fluid chamber assembly. Deflection of the diaphragm 6 is then maintained only by the frictional force between the part 29<SP>1</SP> and slider 3 since cross-piece 16 now falls with further lowering of the casing 30 and sleeve 35. Screws 36 in the latter constrain upwardly a second cylindrical body 37 having a cross-piece 40 against spring 38. After casing 30 has been lowered sufficiently, the cross-piece 40 will engage pin 41, which is rigid with the holder 2, to subject tip 1 to the full pressure of spring 38 as the screws 36 break engagement with the upper edges of the apertures in the cylindrical body 37. As holder 2 descends with further penetration of the tip 1 under' the increased load, the part 29<SP>1</SP> will take with it, by friction, the slider 3 to give a decreased deflection of the diaphragm observable in the capillary tube 9. In a modification of the apparatus, the feeler 4 is in the form of a ball, slider 3 is elongated to give a large bearing surface, and friction is provided by a clip the pressure of which is adjustable.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1933660 | 1960-11-09 | ||
IT1827261 | 1961-10-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB970309A true GB970309A (en) | 1964-09-16 |
Family
ID=26326989
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4020361A Expired GB970309A (en) | 1960-11-09 | 1961-11-09 | Improvements in or relating to an apparatus for measuring hardness |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH388660A (en) |
GB (1) | GB970309A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109632543A (en) * | 2019-01-02 | 2019-04-16 | 浙江大学 | Portable fruit hardness determination instrument |
CN110595870A (en) * | 2019-09-17 | 2019-12-20 | 华北水利水电大学 | Mechanical property testing equipment for rubber material |
CN113176026A (en) * | 2021-03-16 | 2021-07-27 | 蒋文春 | Device for measuring residual stress by indentation method and using method thereof |
-
1961
- 1961-11-09 CH CH1304361A patent/CH388660A/en unknown
- 1961-11-09 GB GB4020361A patent/GB970309A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109632543A (en) * | 2019-01-02 | 2019-04-16 | 浙江大学 | Portable fruit hardness determination instrument |
CN109632543B (en) * | 2019-01-02 | 2024-01-09 | 浙江大学 | Portable fruit hardness detecting instrument |
CN110595870A (en) * | 2019-09-17 | 2019-12-20 | 华北水利水电大学 | Mechanical property testing equipment for rubber material |
CN110595870B (en) * | 2019-09-17 | 2021-09-28 | 华北水利水电大学 | Mechanical property testing equipment for rubber material |
CN113176026A (en) * | 2021-03-16 | 2021-07-27 | 蒋文春 | Device for measuring residual stress by indentation method and using method thereof |
Also Published As
Publication number | Publication date |
---|---|
CH388660A (en) | 1965-02-28 |
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