US2663185A - Hardness tester - Google Patents
Hardness tester Download PDFInfo
- Publication number
- US2663185A US2663185A US252224A US25222451A US2663185A US 2663185 A US2663185 A US 2663185A US 252224 A US252224 A US 252224A US 25222451 A US25222451 A US 25222451A US 2663185 A US2663185 A US 2663185A
- Authority
- US
- United States
- Prior art keywords
- hardness tester
- holder
- indenter
- diamond
- leaf springs
- 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 - Lifetime
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- 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
Definitions
- Hardness testers especially small test apparatus, have heretofore been known in which a holder for a diamond point is fastened on a holding arm.
- the arm and the column supporting it undergo a slight bending when the apparatus is in use and the loading weight is set on the diamond holder.
- the bending goes back whereby a slight sidewise shifting of the diamond point is caused.
- the edges of the impressions are in this case inexact.
- my invention which provides that the diamond holder is secured to the holding arm through means yieldable in a direction normal to the direction of pressure as, for example, leaf springs or bar springs.
- the springs can be mounted in such a way that during the pressing process they will serve under compression or under tension. They transmit the pressure required to impress the diamond point, which is, for example, attained by a deposit-ed weight. If, then, the holder arm and the carrying column are deflected a slight amount by this weight and this deflection is released by the setting down of the diamond point on the specimen, a sidewise shifting of the diamond point is avoided through sidewise bending of the springs.
- Fig. l is a side view of apparatus embodying the invention
- Fig. 2 is a longitudinal section of the diamond holder and springs in tension
- Fig. 3 is a section taken on line III--III of Fig. 2;
- Fig. 4 is a vertical section of a modification embodying two systems of leaf springs
- Fig. 5 isa section taken on line V-V of Fig. 4.
- a holder arm 2 is mounted on a column I by means of a guide 3.
- a body 6 In the holder arm 21s carried a body 6, having a supporting surface 4 for a weight 5.
- leaf springs 1 are fastened at their lower ends 8. At their upper ends 9 the leaf springs carry the diamond holder I which contains the diamond H.
- a specimen I is placed on a specimen support [6 below the diamond point or indenter ll so that when the weight 5 is placed on the platform 4 and the indenter rests on the specimen 2 l5 the indenter may sink into the specimen l5 under weight 5 without side stresses that might shift the point of the indenter sidewise.
- Figs. 4 and 5 disclose an embodiment with opposing leaf springs.
- two leaf springs l2 are secured, whose upper ends carry an intermediate piece I 3.
- At the lower end of the intermediate piece leaf springs It are secured whose planes are at right angles to the planes of the leaf springs I2.
- the diamond holder is secured to the upper ends of the leaf springs M.
- the springs are placed in tension during the step of impressing.
- the invention is not limited to this, for one can without difficulty so arrange the springs that they are under compressive stress.
- a hardness tester which comprises a specimen support, a weightable indenter above said specimen support to move downwardly upon weighting toward said support, a holder carrying said indenter, and supporting elements each attached to said holder at a point spaced vertically from its attachment to said indenter and displaceable sidewise between its attachment to said indenter and to said holder respectively.
Description
Dec. 22, 1953 H. BROSCHKE HARDNESS TESTER Filed Oct. 20, 1951 W14 IIIIIIII Patented Dec. 22, 1953 UNITED STATES PATENT OFFICE HARDNESS TESTER Application October 20, 1951, Serial No. 252,224 6 Claims. (CI. 73-81) My present invention relates to improvements in apparatus for testing the hardness of various materials.
Hardness testers, especially small test apparatus, have heretofore been known in which a holder for a diamond point is fastened on a holding arm. In such apparatus it has been found that the arm and the column supporting it undergo a slight bending when the apparatus is in use and the loading weight is set on the diamond holder. When the diamond is then pressed into the specimen, the bending goes back whereby a slight sidewise shifting of the diamond point is caused. The edges of the impressions are in this case inexact.
This defect is obviated by my invention which provides that the diamond holder is secured to the holding arm through means yieldable in a direction normal to the direction of pressure as, for example, leaf springs or bar springs. The springs can be mounted in such a way that during the pressing process they will serve under compression or under tension. They transmit the pressure required to impress the diamond point, which is, for example, attained by a deposit-ed weight. If, then, the holder arm and the carrying column are deflected a slight amount by this weight and this deflection is released by the setting down of the diamond point on the specimen, a sidewise shifting of the diamond point is avoided through sidewise bending of the springs.
The invention is illustrated by way of example in the accompanying drawings, in which Fig. l is a side view of apparatus embodying the invention;
Fig. 2 is a longitudinal section of the diamond holder and springs in tension;
Fig. 3 is a section taken on line III--III of Fig. 2;
Fig. 4 is a vertical section of a modification embodying two systems of leaf springs, and
Fig. 5 isa section taken on line V-V of Fig. 4.
In the embodiment illustrated in Fig. 1 a holder arm 2 is mounted on a column I by means of a guide 3. In the holder arm 21s carried a body 6, having a supporting surface 4 for a weight 5. As shown in Figs. 2 and 3, in the body 6 leaf springs 1 are fastened at their lower ends 8. At their upper ends 9 the leaf springs carry the diamond holder I which contains the diamond H.
In use a specimen I is placed on a specimen support [6 below the diamond point or indenter ll so that when the weight 5 is placed on the platform 4 and the indenter rests on the specimen 2 l5 the indenter may sink into the specimen l5 under weight 5 without side stresses that might shift the point of the indenter sidewise.
Figs. 4 and 5 disclose an embodiment with opposing leaf springs. At the lower end of the body 6 two leaf springs l2 are secured, whose upper ends carry an intermediate piece I 3. At the lower end of the intermediate piece leaf springs It are secured whose planes are at right angles to the planes of the leaf springs I2. The diamond holder is secured to the upper ends of the leaf springs M.
In both embodiments illustrated, the springs are placed in tension during the step of impressing. The invention is not limited to this, for one can without difficulty so arrange the springs that they are under compressive stress.
Having described my invention, what I claim is:
1. A hardness tester which comprises a specimen support, a weightable indenter above said specimen support to move downwardly upon weighting toward said support, a holder carrying said indenter, and supporting elements each attached to said holder at a point spaced vertically from its attachment to said indenter and displaceable sidewise between its attachment to said indenter and to said holder respectively.
2. The hardness tester of claim 1 in which said supporting elements are leaf springs.
3. The hardness tester of claim 2 in which said leaf springs are spaced equiangularly about the indenter.
4. The hardness tester of claim 1 in which said holder comprises a column and an arm extending sidewise therefrom on which said supporting elements and indenter are carried.
5. The hardness tester of claim 4 in which said arm is provided with a recess spaced from said column and with a body fixed vertically in said recess to which said supporting elements are attached.
6. The hardness tester of claim 5 in which said body is recessed and in which said indenter projects into said recess of said body.
HEINRICH BROSCHKE.
References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,422,634 Riepert et a1. June 17, 1947 FOREIGN PATENTS Number Country Date 603,531 Germany Oct. 3, 1934:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US252224A US2663185A (en) | 1951-10-20 | 1951-10-20 | Hardness tester |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US252224A US2663185A (en) | 1951-10-20 | 1951-10-20 | Hardness tester |
Publications (1)
Publication Number | Publication Date |
---|---|
US2663185A true US2663185A (en) | 1953-12-22 |
Family
ID=22955120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US252224A Expired - Lifetime US2663185A (en) | 1951-10-20 | 1951-10-20 | Hardness tester |
Country Status (1)
Country | Link |
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US (1) | US2663185A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2917919A (en) * | 1952-05-24 | 1959-12-22 | Leitz Ernst Gmbh | Hardness-testing device |
US5046357A (en) * | 1990-01-19 | 1991-09-10 | Crafts Precision Industries, Inc. | Hardness testing diamond indenter |
US20040011118A1 (en) * | 2002-07-18 | 2004-01-22 | Wayne State University | Electronic intelligent indenter |
US20040107581A1 (en) * | 2001-12-28 | 2004-06-10 | Reade Clemens | Diamond-tipped indenting tool |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE603531C (en) * | 1932-12-03 | 1934-10-03 | Julius Peters Fa | Device for determining the hardness of substances in particular in flat layers |
US2422634A (en) * | 1938-04-26 | 1947-06-17 | Riepert Hermann | Microhardness testing instrument |
-
1951
- 1951-10-20 US US252224A patent/US2663185A/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE603531C (en) * | 1932-12-03 | 1934-10-03 | Julius Peters Fa | Device for determining the hardness of substances in particular in flat layers |
US2422634A (en) * | 1938-04-26 | 1947-06-17 | Riepert Hermann | Microhardness testing instrument |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2917919A (en) * | 1952-05-24 | 1959-12-22 | Leitz Ernst Gmbh | Hardness-testing device |
US5046357A (en) * | 1990-01-19 | 1991-09-10 | Crafts Precision Industries, Inc. | Hardness testing diamond indenter |
US20040107581A1 (en) * | 2001-12-28 | 2004-06-10 | Reade Clemens | Diamond-tipped indenting tool |
US7926184B2 (en) * | 2001-12-28 | 2011-04-19 | United Technologies Corporation | Diamond-tipped indenting tool |
US20040011118A1 (en) * | 2002-07-18 | 2004-01-22 | Wayne State University | Electronic intelligent indenter |
US6904806B2 (en) | 2002-07-18 | 2005-06-14 | Wayne State University | Electronic intelligent indenter |
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