US1329902A - Slide-rule - Google Patents

Slide-rule Download PDF

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Publication number
US1329902A
US1329902A US158555A US15855517A US1329902A US 1329902 A US1329902 A US 1329902A US 158555 A US158555 A US 158555A US 15855517 A US15855517 A US 15855517A US 1329902 A US1329902 A US 1329902A
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Prior art keywords
slide
rule
stock
bars
layer
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Expired - Lifetime
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US158555A
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Hemmi Jiro
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Individual
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Priority to US158555A priority Critical patent/US1329902A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06G—ANALOGUE COMPUTERS
    • G06G1/00—Hand manipulated computing devices
    • G06G1/02—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales
    • G06G1/04—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction
    • G06G1/06—Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction with rectilinear scales, e.g. slide rule

Definitions

  • the object of this invention is to provide a slide rule having a hard antifriction and non-absorbent surface which will avoid the expansions and contractions due to changes from dry to moist or moist to dry atmospheres and facilitate the movement of the slide.
  • FIG. 1 is a perspective view of a slide rule embodying this invention.
  • Fig. 2 is an end View of the stock or body.
  • Fig. 3 is an end view of the slide or strip.
  • Fig. 4 is a plan of a modified slide rule and Fig. thereof.
  • this slide rule comprises a laminated 5 is a transverse sectional view stock 1 composed of parallel bars 2, 2 disposed apart from each other, an intermedlate plate 3 connecting said bars and a laminated slide 4 movable between said bars.
  • One bar of the stock 1 is composed of a base layer a; and a top layer 6, the latter being provided with a groove or slideway c on its inner face and the other bar is composed of a base layer 03 and a top layer 6, the latter being provided with a slideway or oove f on its inner face.
  • the slide 4 is composed of a base layer 9, a top layer h and side layers 91 and 9' disposed vertically of said base and top layers and covering the edges thereof.
  • the said layer 71 is provided on its outer face with a tongue 70 adapted to fit the slideway 0 and the side layer j is provided with a tongue Z adapted to fit the slideway f.
  • the base and top layers 9 and h are composed of bamboo strips disposed back to back and cemented together and the side layers 11 and j are composed of bamboo strips cemented to the sides of said base and top strips and covering the joint between them.
  • the fibers of bamboo are always longitudinal and of a hard and silicious character which is non-absorbent of moisture and provides smooth, unchanging antifriction surfaces between the slide and its stock.
  • the parallel bars 2, with scale plates m, suitable material containing the graduations and the slide may be provided with a scale plate 0 composed of celluloid or other suitable material for its graduations.
  • the parallel bars of the stock are connected by the sheet metal strip 3 so that, if excessive clearance is produced between the contact surfaces of the stock and the slide by wear, the sheet metal strip may be slightly bent in such a manner that the two ed es can approach each other.
  • FIG. 11 another embodiment of this invention, illustrated in Figs. 4: and 5, the parallel bars 2, 2 of the stock are separable one from the other, a connecting plate 6 being fastened to 2 may be provided a of celluloid or other one of said bars and detachably connected to the other by inserting the free edge thereof in a slot in said other member.
  • the plate 6 may be fastened to said other memberby a set screw 7 or other suitable means.

Description

J. HEMMI SLIDE RULE.
APPLICATION FILED MAR. 3p, 1917.
,329,902. Patented Feb. 3, 1920.
JIRO HEMMI, OF TOKYO, JAPAN.
SLIDE-RULE.
Specification of Letters Patent. 7
PatentedFeb. 3, 1920.
Application filed March 30, 1917. Serial No. 158,555.
To all whom it may concern:
Be it known that I, J IRO HEMMI, a subject of the Emperor of Japan, residing at Tokyo, Japan, have invented-certain new and useful Improvements in Slide-Rules, whereof the following is a specification.
The object of this invention is to provide a slide rule having a hard antifriction and non-absorbent surface which will avoid the expansions and contractions due to changes from dry to moist or moist to dry atmospheres and facilitate the movement of the slide.
In the accompanying drawings Figure 1 is a perspective view of a slide rule embodying this invention.
Fig. 2 is an end View of the stock or body.
Fig. 3 is an end view of the slide or strip.
Fig. 4 is a plan of a modified slide rule and Fig. thereof.
In the form of embodiment shown in Figs. 1 to 3, this slide rule comprises a laminated 5 is a transverse sectional view stock 1 composed of parallel bars 2, 2 disposed apart from each other, an intermedlate plate 3 connecting said bars and a laminated slide 4 movable between said bars.
One bar of the stock 1 is composed of a base layer a; and a top layer 6, the latter being provided with a groove or slideway c on its inner face and the other bar is composed of a base layer 03 and a top layer 6, the latter being provided with a slideway or oove f on its inner face.
The slide 4 is composed of a base layer 9, a top layer h and side layers 91 and 9' disposed vertically of said base and top layers and covering the edges thereof. The said layer 71 is provided on its outer face with a tongue 70 adapted to fit the slideway 0 and the side layer j is provided with a tongue Z adapted to fit the slideway f. The base and top layers 9 and h are composed of bamboo strips disposed back to back and cemented together and the side layers 11 and j are composed of bamboo strips cemented to the sides of said base and top strips and covering the joint between them.
The fibers of bamboo are always longitudinal and of a hard and silicious character which is non-absorbent of moisture and provides smooth, unchanging antifriction surfaces between the slide and its stock.
The parallel bars 2, with scale plates m, suitable material containing the graduations and the slide may be provided with a scale plate 0 composed of celluloid or other suitable material for its graduations.
The parallel bars of the stock are connected by the sheet metal strip 3 so that, if excessive clearance is produced between the contact surfaces of the stock and the slide by wear, the sheet metal strip may be slightly bent in such a manner that the two ed es can approach each other.
11 another embodiment of this invention, illustrated in Figs. 4: and 5, the parallel bars 2, 2 of the stock are separable one from the other, a connecting plate 6 being fastened to 2 may be provided a of celluloid or other one of said bars and detachably connected to the other by inserting the free edge thereof in a slot in said other member. The plate 6 may be fastened to said other memberby a set screw 7 or other suitable means. By this construction the two parallel bars may be adjusted to increase or .ance between them.
It must be understood that the present inventlon is not limited to the constructions above described, but the construction may decrease the clear- 7 bamboo fibers forming non-absorbent anti- 1iriction sliding surfaces between said memers. I
In testimony whereof I have signed my name to this specification in the presence oftwo subscribing witnesses.
J IRO HEMMI.
Witnesses:
R. KUSAKA, H. F. HAWLEY.
US158555A 1917-03-30 1917-03-30 Slide-rule Expired - Lifetime US1329902A (en)

Priority Applications (1)

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US158555A US1329902A (en) 1917-03-30 1917-03-30 Slide-rule

Applications Claiming Priority (1)

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US158555A US1329902A (en) 1917-03-30 1917-03-30 Slide-rule

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449954A (en) * 1945-03-26 1948-09-21 Ingham S Roberts Slide rule
US2799453A (en) * 1952-07-15 1957-07-16 Faber Castell A W Slide rules

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449954A (en) * 1945-03-26 1948-09-21 Ingham S Roberts Slide rule
US2799453A (en) * 1952-07-15 1957-07-16 Faber Castell A W Slide rules

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