US1559921A - Testing device - Google Patents

Testing device Download PDF

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Publication number
US1559921A
US1559921A US721782A US72178224A US1559921A US 1559921 A US1559921 A US 1559921A US 721782 A US721782 A US 721782A US 72178224 A US72178224 A US 72178224A US 1559921 A US1559921 A US 1559921A
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handle
testing device
slide
piston
compression strength
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US721782A
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Treuheit Leonhard
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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
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Definitions

  • the vertical tester shown in Fig. l com-- prises a hollow cylinder a having the form of a tubular handle, a hollow slide or piston b reciprocating therein, a' cap g with a central opening at the bottom of the cylinder and a measuring dial and pointer e connected with the piston b by a pin d.
  • a hardened steel ball 0 is seated in the lower end of the piston b, and the piston is weighted by shot or the like f.
  • the horizontal tester Fig. 2 is of similar construction but has an angular cylinder.
  • the steel ball is secured in a piston lo which is guided in the horizontal portion i and connected with the hollow piston b in the vertical portion of the cylinder by a bell crank lever m pivoted at Z and links m', m.
  • Means are further provided for drawing the ball .d into the cylinder z' and locking 1924.
  • serial N o. 'masa' the piston when the implement is not in use.
  • a sleeve n comprising a cam face o is placed on the upper end of the cylinder which is slotted at p and a pin g projecting from the slot and secured in the pis ⁇ ton Z) rests on the cam surface 0.
  • the bottom of the handle is placed on the' mould, core, etc. to be tested and the piston b is released by turning the sleeve o.
  • the ball o will then make an impression in the mould whose depth is determined by the weight of the piston and the consolidation of the mould and indicated by the dial e.
  • the compression strength may be calculated by dividing the load on the ball by the surface of the impression whose depth is indicated by the dial el.
  • a table is secured on the outside of the cylinder a on which the compression strength corresponding to the depth of impression may be read directly.
  • the tensile strength of sand, etc. is a function of its compression strength so that the tensile strength may be calculated from the dial indications and tabulated as described.
  • Moulds, cores etc. can thus be tested without any loss of time, a vertical or horizontal testing device being used in accordance with the position of the surfaces to be tested.
  • Testing device for ascertaining the compression strength of granular substances comprising a tubular handle, ⁇ a slide adapted to reciprocate in said tubular handle and provided at one end with a contact surface for engaging a test piece and means on the other end of said handle for indicating the travel of said slide and an operative connection between said slide and said indicating means.
  • Testing device for ascertaining the compression strength or' granular substances comprising a cylindrical handle, a hollow piston-like slide adapted to reciprocate in said handle, weighting means in said handle, a ball secured to one end of said slide land means on the other end of said handle for indicating the stroke of said slide.

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  • 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)

Description

Nov. 3, 1925.
L. TREUHEIT TESTING DEVICE Filed June 23. 1924 Patented Nov. 3, 1925.
UNITED STATES PATENT OFFICE.
LEONHARSD TREUHEIT, or ELBERFELD, GERMANY.
TESTING DEVICE.
Application filed .Tune 23,
taining the compression strength of granular substances and more especially the consolidation of sand, composition and loam moulds.
As is well known to those skilled in the art, the consolidation of moulds and cores is an important factor in foundry practice as it influences to a great extent the quality of castings obtained. If the material is too .strongly compressed, it lacks porosity and the gases cannot escape. If it is too loose, the moulds are expanded and the weight of castings is unduly increased.
By examining the consolidation of the moulds and rejecting such as are too compact or too loose, defective castings can be avoided.
It is an object of my invention to provide a simple and reliable testing device for the purpose specified.
In the drawings afiixed to this specification and forming part thereof, two devices embodying my invention are illustrated diagrammatically by way of example. In the drawings- Fig. 1 is a longitudinal section of a vertical tester and Fig. 2 is an elevation partly in section of a horizontal tester. v
The vertical tester shown in Fig. l com-- prises a hollow cylinder a having the form of a tubular handle, a hollow slide or piston b reciprocating therein, a' cap g with a central opening at the bottom of the cylinder and a measuring dial and pointer e connected with the piston b by a pin d. A hardened steel ball 0 is seated in the lower end of the piston b, and the piston is weighted by shot or the like f.
The horizontal tester, Fig. 2, is of similar construction but has an angular cylinder. The steel ball is secured in a piston lo which is guided in the horizontal portion i and connected with the hollow piston b in the vertical portion of the cylinder by a bell crank lever m pivoted at Z and links m', m.
Means are further provided for drawing the ball .d into the cylinder z' and locking 1924. serial N o. 'masa' the piston when the implement is not in use. To this` end a sleeve n comprising a cam face o is placed on the upper end of the cylinder which is slotted at p and a pin g projecting from the slot and secured in the pis` ton Z) rests on the cam surface 0.
When the sleeve nis turned to the left in Fig. 2, the pin q is raised, carrying the piston b along and vdrawing the ball c into rthe cylinder z' through the medium of the bell- 3 crank lever m.
The operationvof the novel device1s,as
The bottom of the handle is placed on the' mould, core, etc. to be tested and the piston b is released by turning the sleeve o. The ball o will then make an impression in the mould whose depth is determined by the weight of the piston and the consolidation of the mould and indicated by the dial e.
The compression strength may be calculated by dividing the load on the ball by the surface of the impression whose depth is indicated by the dial el. Preferably a table is secured on the outside of the cylinder a on which the compression strength corresponding to the depth of impression may be read directly.
The tensile strength of sand, etc., is a function of its compression strength so that the tensile strength may be calculated from the dial indications and tabulated as described. l
Moulds, cores etc. can thus be tested without any loss of time, a vertical or horizontal testing device being used in accordance with the position of the surfaces to be tested.
I wish it to be understood that I do not desire to be limited t0 the exa-ct details of construction shown and described, for obvious modifications will occur to a person skilled in the art.
I claim 1. Testing device for ascertaining the compression strength of granular substances comprising a tubular handle,` a slide adapted to reciprocate in said tubular handle and provided at one end with a contact surface for engaging a test piece and means on the other end of said handle for indicating the travel of said slide and an operative connection between said slide and said indicating means. f
2. Testing device forv ascertaining the compression strength of granular substances lOO llO
comprising a cylindrical handle, a pistonlike slide adapted to reciprocate in said handle, a ball secured to one end of said slide and mea-ns on said handle for indicating the stroke of said slide.
3. Testing device for ascertaining the compression strength or' granular substances comprising a cylindrical handle, a hollow piston-like slide adapted to reciprocate in said handle, weighting means in said handle, a ball secured to one end of said slide land means on the other end of said handle for indicating the stroke of said slide.
4. Testing device for ascertaining the compression strength of granular substances comprising an angular tubular handle, two slides operatively connected with each other and arranged for reciprocation in different parts of said tubular handle, a ball secured to one of said slides and means on said handle for indicating the travel of said slides.
5. Testing device for ascertaining the compression strength of granular substances comprising a cylindrical shell, a piston-like slide adapted to` reciprocate in saidr handle, a hall secured to one end of said slide, means on said handle for indicating the stroke of said slide, a sleeve rotatably carried on said handle, a cam face on said sleeve and a pin secured to said slide and adapted to cooperatel with said` cam face.
6. Testing device for ascertaining the compression strength of granular substances comprising an angular tubular handle, two slides operatively connected with eachother and arranged for reciprocation in dilerent parts of said handle, a hall secured to one of.
said slides, means on said handle for indicating the travel of said slides and means 'for locking one of said pistons in said handle.
In testimony whereoltl I afiX' my signature.
LEONHARD TREUHE-IT.
US721782A 1924-06-23 1924-06-23 Testing device Expired - Lifetime US1559921A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680967A (en) * 1948-09-04 1954-06-15 Louis B Newman Apparatus for measuring muscle strength

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680967A (en) * 1948-09-04 1954-06-15 Louis B Newman Apparatus for measuring muscle strength

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