US3908276A - Drafting machine braking system - Google Patents

Drafting machine braking system Download PDF

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Publication number
US3908276A
US3908276A US445709A US44570974A US3908276A US 3908276 A US3908276 A US 3908276A US 445709 A US445709 A US 445709A US 44570974 A US44570974 A US 44570974A US 3908276 A US3908276 A US 3908276A
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United States
Prior art keywords
carriage
vertical
horizontal
braking
drafting
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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
US445709A
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English (en)
Inventor
J Peter E Kooi
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.)
Keuffel and Esser Co
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Keuffel and Esser Co
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
Application filed by Keuffel and Esser Co filed Critical Keuffel and Esser Co
Priority to US445709A priority Critical patent/US3908276A/en
Priority to CA219,931A priority patent/CA1025206A/en
Priority to DE19757505314U priority patent/DE7505314U/de
Priority to DE2507446A priority patent/DE2507446C3/de
Priority to JP2250375A priority patent/JPS548137B2/ja
Application granted granted Critical
Publication of US3908276A publication Critical patent/US3908276A/en
Assigned to CONTINENTAL ILLINOIS NATIONAL BANK & TRUST CO., OF CHICAGO, A NATIONAL BANKING ASSOCIATION, BANK OF CALIFORNIA N.A. THE; A NATIONAL BANKING ASSOCIATION, CHASE MANHATTAN BANK, N.A. THE; A NATIONAL BANKING ASSOCIATION, SECURITY NATIONAL BANK, A NATIONAL BANKING ASSOCIATION FOR ITSELF AND AS AGENT FOR CITIBANK, N.A. A NATIONAL BANKING ASSOCIATION, CHEMICAL BANK, A BANKING INSTITUTION OF reassignment CONTINENTAL ILLINOIS NATIONAL BANK & TRUST CO., OF CHICAGO, A NATIONAL BANKING ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEUFFEL & ESSER COMPANY A.N.J. CORP
Anticipated expiration legal-status Critical
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
    • B43L13/04—Guides for rulers
    • B43L13/045—Guides for rulers with carriages

Definitions

  • ABSTRACT Operating levers for controlling the horizontal and vertical movement of a track-type drafting machine are mounted on the vertical motion carriage and are at all times within the functional span of the hand of a draftsman grasping the protractor drafting head. Actuation of the brake assembly carried by the horizontal motion carriage is effected by means of a cord loop extending between the carriages with movement of the operating lever drawing the cord through a dead center point of maximum tension, thus providing for the retention of the brake in the desired released or engaged condition.
  • Such devices generally comprise a stationary horizontal track affixed to the top edge of a drafting board or table and along which a wheeled carriage is guided to provide a freedom of movement across the board in the horizontal direction.
  • Attached to and moving with the horizontal track carriage is a vertical track member along which is guided a second wheeled carriage to provide vertical motion over the drafting surface.
  • the usual protractor drafting head is attached to the vertical track carriage and as a result of the orthoganal movements provided by the carriages is enabled to move to any point on the drafting surface.
  • a brake-actuating system described in U.S. Pat. No. 2,102,636 embodied the desirable feature wherein movement of a horizontal brake control member was, in fact, associated with the movement of the vertical motion carriage. That system, however, did not entirely satisfy the demands of the draftsman, since the critical actuating elements were so arranged as to require the removal of the draftsmans hand from the arena of the protractor head, thus rendering horizontal motion braking during drafting activity a two-handed operation.
  • the present invention provides an improvement in the device generally described in U.S. Pat. No. 2,102,636 whereby either or both of the horizontal and vertical track carriage brake may be actuated by the draftsman from any location on a drafting board without a need for his moving the operating hand from the protractor head of the drafting machine.
  • a drafting machine braking system which includes a running cord loop anchored to the vertical carriage and encompassing brake actuating means situated at the horizontal motion carriage and manually accessible control means situated at the vertical motion carriage.
  • the control means is constantly in communication with the horizontal motion braking assembly regardless of the distance between the horizontal and vertical carriages.
  • the horizontal brake control means carried by the vertical carriage comprises a pivoted lever to the proximal arm of which is attached the terminal end of the cord forming the control loop.
  • a control member at the end of the distal lever arm is movable through a short are within the span of the draftsmans hand from the protractor head and by such movement causes the lever to apply tension to the control cord during a portion of the arcuate sweep of the lever arm. Such tension results in a shortening of the loop and thus transfers the draftsmans effort to the brake assembly of the horizontal carriage.
  • the proximal arm of the brake control lever is so disposed, however, with respect to the attitude of the terminal reach of the cord to which it is attached that completion of the arcuate sweep of the lever carries the arm through a dead center point of maximum cord tension and into a position which is thereafter maintained by the reactive tension of the cord upon the lever arm.
  • the noted dead center point is located at a distance from the center of the arcuate sweep of the lever and thereby results in a difference between the cord tensions at the arc termini.
  • cord tension difference establishes the respective engaged and released conditions of the horizontal brake.
  • a similar control lever actuating arrangement is provided with respect to the vertical motion brake; however, since both the actuating and braking means are located at the vertical carriage, the need for a control cord is eliminated and the lever action is applied directly.
  • the control member for this second braking assembly is situated closely adjacent that of the horizontal brake control lever, thereby placing all braking controls and the protractor head within a single span of the draftsmans hand.
  • FIG. 1 depicts a track-type drafting machine mounted upon a drawing board and reveals, in partial cut-away, carriage assemblies embodying a braking system according to the present invention
  • FIG. 2 shows in greater detail a drafting machine horizontal motion carriage with braking means according to the present invention
  • FIG. 3 shows in greater detail a drafting machine vertical motion carriage with braking means according to the present invention.
  • FIG. 1 there is mounted along the upper edge of drafting board by means of mounting brackets 12 (one of which is shown) the horizontal track member 20'of a track-type drafting machine.
  • a wheeled horizontal motion carriage 22 is arranged to move along parallel tracks associated with track member 20 to thereby provide the horizontal degree of motion freedom to the drafting machine.
  • a braking assembly shown generally at 24 and to be described later in more detail, comprising a pivotted lever arm mounting a brake shoe with spring means biasing the lever arm to movement in a direction to engagethe brake shoe with a surface of track member 20.
  • a vertically disposed track member 30 is mounted at the lower end of vertical member 30.
  • wheel assembly 18 which provides track member 30 with support for its movement with carriage 22 across the width of drawing board 10.
  • a generally similar vertical carriage 32 Arranged for movement along vertical member 30 in the manner previously described with respect to the horizontal carriage is a generally similar vertical carriage 32 to which is pivotally mounted through a yoke 16 the protractor drafting head assembly 14 of the drafting machine.
  • a braking assembly 34 similar to assembly 24 of carriage 22 is pivotally mounted on vertical motion carriage 32 and provides the means for arresting motion of carriage 32 and drafting head 14 in the vertical direction.
  • Brake actuating controls 15, 17 located at the respective distal ends of lever arms 37, 36 pivotally mounted on vertical carriage 32 are positioned within the span of a draftsmans hand stationed at drafting head 14.
  • Means for actuating vertical motion brake assembly 34 to govern movement of carriage 32 may be seen to generally comprise lever 36 which, upon movement of control member 17, effects withdrawal of the vertical brake shoe from engagement with track member 30. Further detail in the operation of this brake actuating means will be given with reference to FIG. 3.
  • Actuating means for horizontal brake assembly 24 to control movement of carriage 22 along track member 20 is simply and schematically represented in the drawings by a lever 26 pivotally mounted to horizontal carriage 22 and communicating between vertical brake lever arm 24 and pulley member 27.
  • a lever 26 pivotally mounted to horizontal carriage 22 and communicating between vertical brake lever arm 24 and pulley member 27.
  • Such a schematic representation should not detract from a complete understanding of the present invention; however, since it will be readily understood by those familiar with tracktype drafting machines, such as are described in the aforementioned patent specifications, that the additional elements of the present embodiment of the invention may be employed as well to actuate complex lever train brake mechanisms housed in bridging assemblies often used to mount the vertical track member upon the horizontal carriage.
  • brake actuating lever 26 in the actions described below, one will derive no less a complete description of the instant invention.
  • Means for transferring brake-actuating effort from the draftsmans fingertip to braking assembly 24 comprises a cord or cable 13 which is anchored at one end to vertical carriage 32, trained about actuating lever pulley 27 and a stationary pulley 19 mounted on vertical track member 30 near its lower end, and affixed at its terminal end to lever arm 37, thereby forming of the cord a running loop extending substantially the entire length of track member 30.
  • the loop of cord will trail the vertical movement of carriage 32 and that tension applied to the cable at its mobile end by movement of lever arm 37 will effect a shortening of the cord loop and cause a downward movement of pulley 27 with resulting actuation of brake assembly 24 to disengage the horizontal carriage brake from track member 20.
  • cord 13 may serve a dual function as both brake control loop and counterweight cord.
  • FIG. 2 is shown the enlarged and more detailed view of horizontal motion carriage 22 and the horizontal motion braking assembly mounted thereon.
  • body plate 22 of the carriage On body plate 22 of the carriage are mounted wheels 23 which are in rolling engagement with parallel track surfaces 21 of horizontal track member 20.
  • the vertical motion carriage comprises a similar arrangement of carriage body plate 32 mounting wheels 33 which'engage parallel track surfaces 31 of vertical track member 30. Braking of the vertical movement of carriage 32 along the vertical track member is effected in a manner similar to that earlier described with respect to the horizontal motion carriage.
  • body plate 32 carries a braking assembly comprising brake lever arm 34 with brake shoe bracket 52 and brake shoe 53 pivotted at stud 35 for counter-clockwise movement under the biasing force of compression spring assembly 54, 55 to engage brake shoe 53 with track member edge surface 39 to arrest movement of the vertical carriage.
  • the horizontal brake control loop is formed when cord 13, anchored at stud 5] on vertical carriage body plate 32, is trained upward and about horizontal brake actuating lever pulley 27, thence downward and about stationary vertical track member pulley l9, thence about guide 62, and finally to attachment to brake control lever arm stud 56.
  • slot 57 is so situated with respect to brake control lever arm 37 and pivot stud 38 that slot termini stud positions 56, 56 are at different distances from a common cord tangent point 63 on guide 62.
  • movement of control member 15 between its terminal positions 15, 15' effects a condition of greater or lesser tension upon cord 13, the greater at 15 overcoming the biasing force of horizontal brake spring 44 with the resulting shortening of the cord loop to displace pulley 27 and disengage the horizontal brake as earlier described.
  • the proximal arm of lever 37 passes through a position at which the distance between stud 56 and the common tangent point 63 is the greatest and, thus, at which cord extension and tension are a maximum.
  • a dead center point of maximum cord tension occurs when the terminal cable leg 13" overlies the center of lever arm pivot 38 and is thus coicident coincident the proximal arm of control lever 37.
  • damping torsion spring 58 between stud 56 and an anchor stud 59 on body plate 32.
  • the torque of damping spring 58 is insufficient to cause any substantial decrease in the biasing force of horizontal brake actuating spring 44.
  • a drafting machine comprising a horizontally disposed track member, a horizontal motion carriage arranged to travel along the horizontal track, a vertically disposed track member carried by said horizontal carriage for movement therewith, a vertical motion carriage arranged to travel along the vertical track, a drafting head carried by said vertical carriage for movement therewith and with said vertical member, said drafting head thereby having two orthogonal degrees of freedom of movement over the surface of a drafting board, braking means for individually arresting the travel of each of said carriages to thereby limit the respective degrees of freedom of said drafting head, and means within reach of the hand of a draftsman grasping said drafting head for actuating vertical motion carriage braking means, the improvement in said braking means whereby actuation thereof to control the travel of both said carriages may at all times be effected by the hand of a draftsman stationed at said drafting head, said improvement comprising:
  • a braking member including a brake shoe mounted on said horizontal motion carriage for movement to and from carriage-arresting contact with said horizontal track member;
  • lever means coupled to said braking member arranged to transfer to said braking member actuating force applied to a distal arm thereof to thereby overcome said urging means and effect separation of said carriage-arresting contact between said brake shoe and horizontal track member;
  • a cord attached to said vertical motion carriage displacement of said proximal lever arm effects a shortening of said loop through a minimum loop length, thereby displacing said lever arm-mounted pulley through a maximum with concurrent maximum displacement of said braking member and separation between said brake shoe and horizontal track member;
  • stop means limiting the displacement ofsaid control lever means beyond the position of said minimum loop length to a distance which is less than the displacement distance from the position of brake shoe engagement with said horizontal track member to said position of minimum loop length.
  • said vertical motion carriage braking means comprises:
  • a braking member including a brake shoe mounted on said vertical motion carriage for movement to and from carriage-arresting contact with said vertical track member; 7
  • a second control lever means pivotally mounted on said vertical motion carriage with a distal lever arm thereof within the reach of the hand of a draftsman grasping said drafting head and arranged to transfer to said braking member actuating force applied to said distal arm thereof ,to thereby overcome said .urging means and effect separation of said carriage-arresting contact between said brake shoe and vertical track member.

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US445709A 1974-02-25 1974-02-25 Drafting machine braking system Expired - Lifetime US3908276A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US445709A US3908276A (en) 1974-02-25 1974-02-25 Drafting machine braking system
CA219,931A CA1025206A (en) 1974-02-25 1975-02-12 Drafting machine braking system
DE19757505314U DE7505314U (de) 1974-02-25 1975-02-21 Laufwagenzeichenmaschine
DE2507446A DE2507446C3 (de) 1974-02-25 1975-02-21 Laufwagenzeichenmaschine
JP2250375A JPS548137B2 (enrdf_load_stackoverflow) 1974-02-25 1975-02-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US445709A US3908276A (en) 1974-02-25 1974-02-25 Drafting machine braking system

Publications (1)

Publication Number Publication Date
US3908276A true US3908276A (en) 1975-09-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
US445709A Expired - Lifetime US3908276A (en) 1974-02-25 1974-02-25 Drafting machine braking system

Country Status (4)

Country Link
US (1) US3908276A (enrdf_load_stackoverflow)
JP (1) JPS548137B2 (enrdf_load_stackoverflow)
CA (1) CA1025206A (enrdf_load_stackoverflow)
DE (2) DE2507446C3 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486957A (en) * 1982-01-25 1984-12-11 Franz Kuhlmann Praezisionsmechanik Und Maschinenbau Gmbh & Co. Kg Drawing machine carrriage

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55140598A (en) * 1979-04-21 1980-11-04 Mutoh Ind Ltd Brake control for rail type universal parallel rule and others
DE3202243C2 (de) * 1982-01-25 1983-12-01 Franz Kuhlmann Präzisionsmechanik und Maschinenbau GmbH & Co KG, 2940 Wilhelmshaven Laufwagen-Zeichenmaschine
DE3202234C2 (de) * 1982-01-25 1983-12-22 Franz Kuhlmann Präzisionsmechanik und Maschinenbau GmbH & Co KG, 2940 Wilhelmshaven Laufwagen-Zeichenmaschine
JPS5941589U (ja) * 1982-09-08 1984-03-17 旭精密株式会社 横カ−ソルのブレ−キ操作装置
JPS5959395U (ja) * 1982-10-13 1984-04-18 旭精密株式会社 自在平行定規等の横カ−ソルのブレ−キ操作装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102636A (en) * 1960-11-04 1963-09-03 George L Boone Towel hanger
US3279073A (en) * 1963-11-15 1966-10-18 Keuffel & Esser Co Drafting machine
US3400461A (en) * 1966-04-28 1968-09-10 Nestler Ag Albert Carriage-type drawing apparatus
US3762055A (en) * 1971-07-15 1973-10-02 Sieburg Ind Inc Indexing device for drafting instrument
US3823479A (en) * 1970-12-28 1974-07-16 Mutoh Ind Ltd Drawing instrument

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2102636A (en) * 1932-08-13 1937-12-21 Mcdonald Leonard Drafting machine
DE1511466B1 (de) * 1966-04-28 1969-09-11 Nestler Gmbh A Laufwagenzeichenmaschine
DE1985926U (de) * 1966-04-28 1968-05-22 Albert Nestler A G Laufwagenzeichenmaschine.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3102636A (en) * 1960-11-04 1963-09-03 George L Boone Towel hanger
US3279073A (en) * 1963-11-15 1966-10-18 Keuffel & Esser Co Drafting machine
US3400461A (en) * 1966-04-28 1968-09-10 Nestler Ag Albert Carriage-type drawing apparatus
US3823479A (en) * 1970-12-28 1974-07-16 Mutoh Ind Ltd Drawing instrument
US3762055A (en) * 1971-07-15 1973-10-02 Sieburg Ind Inc Indexing device for drafting instrument

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486957A (en) * 1982-01-25 1984-12-11 Franz Kuhlmann Praezisionsmechanik Und Maschinenbau Gmbh & Co. Kg Drawing machine carrriage

Also Published As

Publication number Publication date
DE7505314U (de) 1981-05-27
JPS50124731A (enrdf_load_stackoverflow) 1975-10-01
CA1025206A (en) 1978-01-31
DE2507446A1 (de) 1975-08-28
DE2507446C3 (de) 1981-03-26
DE2507446B2 (de) 1980-07-10
JPS548137B2 (enrdf_load_stackoverflow) 1979-04-12

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AS Assignment

Owner name: SECURITY NATIONAL BANK, A NATIONAL BANKING ASSOCIA

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323

Owner name: CHASE MANHATTAN BANK, N.A. THE; A NATIONAL BANKING

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323

Owner name: CHEMICAL BANK, A BANKING INSTITUTION OF NY.

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323

Owner name: CONTINENTAL ILLINOIS NATIONAL BANK & TRUST CO., OF

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323

Owner name: BANK OF CALIFORNIA N.A. THE; A NATIONAL BANKING AS

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323

Owner name: CHEMICAL BANK, A BANKING INSTITUTION OF, NEW YORK

Free format text: SECURITY INTEREST;ASSIGNOR:KEUFFEL & ESSER COMPANY A.N.J. CORP;REEL/FRAME:003969/0808

Effective date: 19820323