US1097656A - Tread. - Google Patents

Tread. Download PDF

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Publication number
US1097656A
US1097656A US730373A US1912730373A US1097656A US 1097656 A US1097656 A US 1097656A US 730373 A US730373 A US 730373A US 1912730373 A US1912730373 A US 1912730373A US 1097656 A US1097656 A US 1097656A
Authority
US
United States
Prior art keywords
tread
abrasive
lumps
fact
witnesses
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
Application number
US730373A
Inventor
Harry P Macdonald
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.)
Snead & Co Iron Works
Original Assignee
Snead & Co Iron Works
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
Priority claimed from US71485712A external-priority patent/US1057069A/en
Application filed by Snead & Co Iron Works filed Critical Snead & Co Iron Works
Priority to US730373A priority Critical patent/US1097656A/en
Application granted granted Critical
Publication of US1097656A publication Critical patent/US1097656A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F11/00—Stairways, ramps, or like structures; Balustrades; Handrails
    • E04F11/02—Stairways; Layouts thereof
    • E04F11/104—Treads
    • E04F11/16—Surfaces thereof; Protecting means for edges or corners thereof

Definitions

  • Another advantage of the construction resides in the fact that, should the tread wear unevenly for some reason or other, or become roughor jagged, it may be reversed, in which event the lower surface will in a very short time become as effective an abradant non-slipping surface as the upper surface. It will be apparent that this will result in prolonging the life of the tread.
  • metal plate having embedded therein a plurality of lumps of abrasive each of approxiof the tread and presenting substantially the same aggregate surface of abrasive on each side of the tread so that the tension produced bythe casting on the two surfaces of the plate shall be substantially equal so as to avoid warping.
  • a tread member comprising a substantially flat cast metal plate having embedded therein a plurality of lumps of abrasive spaced substantially equi-distant from one another and each of approximately the same thickness as the body of the tread, the said lumps lying at least'flush with one face of the tread and presenting substantially the same aggregate surface of abrasive on each side of the plate so that the tension produced by the casting on the two surfaces of theplate shall be SO nearly equal as to avoid warping.

Description

H. P. MACDONALD.
TREAD.
APPLICATION FILED NO".
Patented May 26, 1914:.
WITNESSES:
wearing properties and thereby insures an extended life to the tread as a whole. Other advantages will occur to those familiar with the art.
Another advantage of the construction resides in the fact that, should the tread wear unevenly for some reason or other, or become roughor jagged, it may be reversed, in which event the lower surface will in a very short time become as effective an abradant non-slipping surface as the upper surface. It will be apparent that this will result in prolonging the life of the tread.
Another advantage incident to the construction is that in manufacturing, uniformity of product is secured'by reason of the fact that the abrasive elements will always be in proper relation to the upper surfaceof the matrix, in view of the fact that the individual lumps are greater in their least dimension than the thickness of the matrix, so that a portion will always project slightly above said surface. This also simplifies V manufacture.
metal plate having embedded therein a plurality of lumps of abrasive each of approxiof the tread and presenting substantially the same aggregate surface of abrasive on each side of the tread so that the tension produced bythe casting on the two surfaces of the plate shall be substantially equal so as to avoid warping.
2. As an article of manufacture, a tread member comprising a substantially flat cast metal plate having embedded therein a plurality of lumps of abrasive spaced substantially equi-distant from one another and each of approximately the same thickness as the body of the tread, the said lumps lying at least'flush with one face of the tread and presenting substantially the same aggregate surface of abrasive on each side of the plate so that the tension produced by the casting on the two surfaces of theplate shall be SO nearly equal as to avoid warping.
In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.
HARRY P. MACDONALD.
Witnesses J. F. ARNOLD, C. C. GREENLEE, Jr.
US730373A 1912-08-13 1912-11-09 Tread. Expired - Lifetime US1097656A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US730373A US1097656A (en) 1912-08-13 1912-11-09 Tread.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71485712A US1057069A (en) 1912-08-13 1912-08-13 Method of casting tread-surfaces.
US730373A US1097656A (en) 1912-08-13 1912-11-09 Tread.

Publications (1)

Publication Number Publication Date
US1097656A true US1097656A (en) 1914-05-26

Family

ID=3165861

Family Applications (1)

Application Number Title Priority Date Filing Date
US730373A Expired - Lifetime US1097656A (en) 1912-08-13 1912-11-09 Tread.

Country Status (1)

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US (1) US1097656A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984052A (en) * 1959-08-12 1961-05-16 Norton Co Coated abrasives

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984052A (en) * 1959-08-12 1961-05-16 Norton Co Coated abrasives

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