US2487345A - Mathematical drawing instrument - Google Patents

Mathematical drawing instrument Download PDF

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Publication number
US2487345A
US2487345A US707110A US70711046A US2487345A US 2487345 A US2487345 A US 2487345A US 707110 A US707110 A US 707110A US 70711046 A US70711046 A US 70711046A US 2487345 A US2487345 A US 2487345A
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US
United States
Prior art keywords
cutters
arms
comb
guard
shaver
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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
US707110A
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English (en)
Inventor
Liber Henri Sosthene
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.)
Civile D'etudes & Inventions Liber Ste
Ile D Etudes & Inv S Liber Soc
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Ile D Etudes & Inv S Liber Soc
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.)
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Publication date
Application filed by Ile D Etudes & Inv S Liber Soc filed Critical Ile D Etudes & Inv S Liber Soc
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Publication of US2487345A publication Critical patent/US2487345A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/02—Draughting machines or drawing devices for keeping parallelism
    • B43L13/08—Protractor heads

Definitions

  • the orientable heads for drawing instruments which are known at the present time generally comprise a ring which is connected to the movable arms of the instrument and on which is rotatably mounted a support on which are fixed the drawing instruments and which the draughtsman can move into any desired angular position by means of a central operating knob.
  • An automatically acting bolt enables the support to be locked in predetermined positions, for example every ten or fifteen degrees; said bolt is moved into the retracted position by a first lever which, when released, allows the bolt to engage automatically as soon as the support, as it rotates, comes opposite one of the said predetermined positions. It is however advantageous to beable to neutralise completely said bolt and prevent it from engaging automatically so as to enable said support to rotate quite freely. This neutralisation is obtained by means of a second lever which looks the first. Finally, it should be possible when the bolt is neutralised, to be able to lock the support in any desired position; this locking is obtained by means of a shoe which acts by braking on the periphery of the ring and which is operated by a third lever.
  • the present invention enables an orientable head to be obtained which has the same properties as the present known heads, but the operation of which is much more convenient and can easily be effected with one hand.
  • the head according to the invention is essentially characterised by the fact that it comprises, for effecting the various above-mentioned operations, a single control member which is located in the immediate vicinity of the central control knob of the support and the operation of which in one direction produces: in a first phase, the disengagement of the bolt, with the possibility, however, for said bolt to return to its engaged position if the action stops on this member before it has gone beyond said first phase of movement; in a second phase, the neutralisation of said bolt which can then no longer engage; and finally, in a third and last phase, the locking of the support by means of the braking shoe, the bolt remaining neutralised, while the operation of this single control member in the opposite direction produces the reverse operations.
  • the draughtsman can then very easily, using only one hand, act on the central knob in order to orient the head and on the aforesaid member in 2 order to efiect the various locking and unlocking operations hereinbefore mentioned.
  • Fig. 1 is a view in sectional elevation of said head.
  • Fig. 2 is the corresponding plan view, the case of the mechanismbeing assumed to have been removed.
  • Figs. 3, 4 and 5 show respectively an elevational view, a top plan view and a bottom plan view of one of the main parts of the mechanism.
  • Fig. 6 is a diagram representing the development over 360 of the two sets of cams of the mechanism.
  • Figs. 7 and 8 show a plan view which is very diagrammatic, of the retracting pawl in two different positions.
  • Fig. 9 shows an improvement.
  • Fig. 10 is a view of another embodiment of said head, in longitudinal section.
  • Fig. 11 is the corresponding plan view, the case of the mechanism being assumed to have been removed.
  • Fig. 12' is a perspective view of said mechanism.
  • Fig. 13 is a plan view on a smaller scale of the case forming a handle.
  • Fig. 14 is a plan view showing a modification of a detail of construction.
  • the head according to the invention comprises a ring I which is fixed on the movable arms (not shown) of the drawing instrument, by means for example of pins passing through holes 2 provided in said ring.
  • a case 6 on said support 4 is 45 fixed a case 6, the upper part of which forms an operating knob I enabling the support 4 to be rotated relatively to the ring.
  • a second knob 8 which is located in the immediate vicinity 0 of the knob l and which drives, as itrotates, by
  • a sleeve ll shown in Figs. 3 to 5.
  • Said sleeve can rotate on a fixed tube I2 secured to the support 4 through the intermediary of the support 36, and
  • Said bolt has passing through it two pins l5 and I6, the ends of which pass through button- I hole slots ll of the pivot-tube I2 and project on either side of said tube (Fig. 2).
  • the upper pin I5 co-operateswith the upper face of the sleeve II which forms two diametrically opposite cams, the cross sectional shape Each of said of which is developed in Fig. 6.
  • cams co-operates with one of the ends ofthe pin I5 and comprise a flat sunken in portion IB Isa, a slope I9I9a, and finally a raised'flat-portion -400,.
  • the lower pin I6 co-operates in the same manner with the lower faceof the sleeve forming identical cams 2I-22-28; 2-1a--22a position by the flat faces iii- 126a of the lower cam a of the sleeve (Fig. 6).
  • the bolt I3 is therefore held in its low position in which it is engaged in one of the perforations I4 and locks the support 4 in the corresponding position.
  • the slopes IS--I9a of the upper cam cause the bolt I3 to move upwards and become disengaged from the perforation I4 so that the draughtsman can rotate the support relatively to the ring. through which the sleeve II has rotated is less than that over which the slope extends and which is equal to the angle through which the sleeve has to rotate in order that the skirt 24 shall escape the action Of the retracting pawl 26 (compare Figs. 7 and 8), the bolt I3 will automatically engage in the first perforation I4 encountered during the rotation of the support, as soon as the draughtsman stops his action on the knob 8.
  • the pawl 26 returns the sleeve to its inoperative positionand the slopes 22 -22a of the lower cam positivel control the downward movement of the pin I6.
  • Means. are then provided to enableit to be locked inany desired position, thisbeing effected by rotating the knob 8 still further and still in;
  • knob 8 When the knob 8 is operated in the opposite direction starting from this extreme locking position, it begins by releasing the shoe 303I, thereby releasing completely the support; if the movement is continued, the slopes 222 2a of the lower cam of the sleeve I I (Fig. 6) positively controlth'e downward movement of the bolt I 3, when it is located opposite a perforation I4.
  • the draughtsman can very easily, with one hand; act on the central knob I in order to rotate-the support 4 and act on the adjacent knob 8 in order to control the various locking or unlocking operations hereinbefore mentioned.
  • the head which has just been described is provided, in the usual manner, with a graduation 32. marked on the ring I and. with which. co-operatesa pointer 33 carried-by the support 4.
  • a segment B-ilmade of Celluloid for example which is fixed to one of the parts I or 4 and which: co-operates with a graduation carried by the other of said parts.
  • Said segment does not carry any indelible. indication, but the draughtsman can mark thereon any indications he pleases. Iffor example he has to make a drawing of which a part requires the head-to be in the zero position, whereas another part requires said head to be displaced 20", he will make a.
  • Figs. ll to 14 another embodiment has been shown of the head according to the invention.
  • the knob8 carries with it; as it rotates, the bolt I3b means of its claws 9 between which are engaged projections secured to saidbolt; said projections are also ongaged in notches 4i ofthe sleeve II so that-said sleeve is also carried round in the rotary movement of the knob 8.
  • Said sleeve II is provided, on its lower face, with two diametrically opposite cam surfaces 22 and. 22a rotatably supported on the fixed tube I2, so that the beginning of the rotary movement of said sleeve (from its inoperative position Figs.
  • the cam 43 terminates by a radial projection 44 which, inthe normal inoperative position, abuts against the arm 30a of the shoe 30 (Fig. 12); the sleeve II is retracted into this position by the spring-pressed pawl 26 acting on an edge 25 of said sleeve.
  • a spring 45 (Fig. holds the bolt I3 and the sleeve II in their low position for which the lower end of said bolt is engaged in one of the perforations I-4, thereby locking the support 4 in the corresponding position. If the draughtsman rotates slightly the knob 8, the bolt I3 and the sleeve II are carried along with this movement; the slopes 42 of the sleeve II then cause a slight upward movement of said sleeve and of the bolt, said, bolt becomes disengaged from the perforation I4, so that the draughtsman, by acting on the handle 6a, can rotate the support 4 relatively to the ring I.
  • knob 8 When the knob 8 is operated in the opposite direction starting from this extreme locking position, it begins by releasing the shoe 30, thereby completely freeing the support; if the movement is continued, the sleeve II is finally returned to its inoperative position for which the bolt I3 engages in the first perforation I4 encountered.
  • the ring I is not directly secured to the part 46 which is intended to be fixed on the movable arms (not shown) of the drawing instrument.
  • the position of said ring can, on the contrary, be adjusted to a certain extent relatively to said part 46.
  • This possibility of adjustment is obtained by means of a micrometer screw 41 engaged in a nut 48 carried by the part 46; the micrometer screw 41, when it is operated, produces the movement of a slider 49 secured to the ring I, which can pivot at 50 on the part 46.
  • the screw 41 is rotated, the ring I is made to pivot relatively to the part 46 and, consequently, the angular adjustment of said ring relatively to said part is obtained.
  • the locking of these two parts is obtained by means of a locking handle 5I.
  • An orientable head for drawing instruments comprising a ring connected to the movable arms of the instrument, a support rotatably mounted on said ring and. on which are mounted the drawing instruments, a central knob for operating said support, an automatically engaging bolt for locking the support in predetermined positions, means for neutralising said bolt, a braking shoe for locking the support in any desired position, a single control member located in close proximity to said central knob and provided with a sleeve carrying a first set of cams provided with slopes which produce, at the beginning of the movement of said member in one direction, the upward movement of said bolt, and a second set of cams provided with slopes, which control the downward movement of said bolt at the end of the movement of said member in the opposite direction, the cams of the first set having, after said slopes, a raised fiat portion holding said bolt in the position of non-engagement,

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  • Dry Shavers And Clippers (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Braking Arrangements (AREA)
US707110A 1941-05-06 1946-11-01 Mathematical drawing instrument Expired - Lifetime US2487345A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR56020T 1941-05-06
FR993843T 1941-05-06
FR253541X 1941-05-06
FR994901T 1945-08-02

Publications (1)

Publication Number Publication Date
US2487345A true US2487345A (en) 1949-11-08

Family

ID=27445063

Family Applications (1)

Application Number Title Priority Date Filing Date
US707110A Expired - Lifetime US2487345A (en) 1941-05-06 1946-11-01 Mathematical drawing instrument

Country Status (5)

Country Link
US (1) US2487345A (en, 2012)
BE (1) BE459770A (en, 2012)
CH (2) CH253541A (en, 2012)
FR (3) FR993843A (en, 2012)
GB (2) GB602186A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542380A (en) * 1945-06-06 1951-02-20 Cellophane Sa Drafting instrument
US3178825A (en) * 1961-09-25 1965-04-20 Vard Newport Counterbalanced drafting machine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1091900B (de) * 1958-08-25 1960-10-27 Walter Braxmaier Rasiergeraet mit rotierendem Scherkopf
NL8301481A (nl) * 1983-04-27 1984-11-16 Philips Nv Scheerapparaat.
NL8302234A (nl) * 1983-06-23 1985-01-16 Philips Nv Scheerapparaat.
JPS63160691A (ja) * 1986-12-23 1988-07-04 松下電工株式会社 電気かみそり
CN112140775B (zh) * 2020-09-25 2021-12-28 山东工业职业学院 一种具有折叠收纳功能的机械制图用几何教具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575169C (de) * 1931-12-11 1933-04-25 E H Viktor Graf Dr Ing Feststellvorrichtung fuer Zeichenkoepfe von Parallel-Zeichengeraeten
US2394344A (en) * 1943-01-04 1946-02-05 Vard Inc Drafting machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE575169C (de) * 1931-12-11 1933-04-25 E H Viktor Graf Dr Ing Feststellvorrichtung fuer Zeichenkoepfe von Parallel-Zeichengeraeten
US2394344A (en) * 1943-01-04 1946-02-05 Vard Inc Drafting machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542380A (en) * 1945-06-06 1951-02-20 Cellophane Sa Drafting instrument
US3178825A (en) * 1961-09-25 1965-04-20 Vard Newport Counterbalanced drafting machine

Also Published As

Publication number Publication date
BE459770A (en, 2012)
GB602186A (en) 1948-05-21
FR993843A (fr) 1951-11-07
FR994901A (fr) 1951-11-23
GB615950A (en) 1949-01-13
CH254555A (fr) 1948-05-15
CH253541A (fr) 1948-03-15
FR56020E (fr) 1952-09-11

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