US1277962A

US1277962A - Drawing instrument for section-lining and for laying down and measuring angles.

Info

Publication number: US1277962A
Application number: US7195816A
Authority: US
Inventors: Gustaf Loennqvist
Original assignee: Individual
Current assignee: Individual
Priority date: 1916-01-13
Filing date: 1916-01-13
Publication date: 1918-09-03
Anticipated expiration: 1935-09-03

Description

e. LIINNQVIST. DRAWING INSTRUMENT FOR SECTION LINING AND FOR LAYING DOWN AND MEASURING ANGLES. APPLICATION FILED JAN. I3. I916.

1,277,962. Patented Sept. 3,1918.

Inven/on (20372 1 Lhn 7 W57 m5 NORRIS PEYERS can PNoTo-Lnrsa, wasnms mu. m c.

UNITED STATES PATENT OFFICE.

GUSTAF LillNNQVIST, GOTTENBORG, SWEDEN.

DRAWING INSTRUMENT FOR SEOTION-LINING AND FOR LAYING DOWN AND MEASURING ANGLES.

Specification of Letters Patent,

Patented Sept. 3, 1918.

Application filed January 13, 1916. Serial No. 71,958.'

To all whom it may concern:

Be it known that I, GUSTAF LoNN vIs'r,

asubject of the King of Sweden, residing in Gottenborg, in the Kingdom of Sweden,

have invented a new and useful Improvement in Drawing Instruments for Section- Inning and for Laying Down and Measurlng Angles, of which the following is a specifica tion.

This invention relates to an improvement in drawing instruments for section lining and for laying down and measuring angles by means of which a ruler may be moved and securely guided parallel with itself. Drawing boards have been designed in which the ruler or straight edge is given such a motion 'by means of special balancing devices. The present invention possesses the advantage over such arrangements, how ever, that according to the same the instrument maybe removed from a board to another, and the invention also provides means for securing the ruler in any desired position and for moving it step by step, which is particularly useful in drawing section lines, or similar workwhere a great number of equally spaced lines must be drawn.

My invention refers'more particularly to the class of drawing instruments in which the'ruler is moved along and is guided by a rail, a groove, or the like, secured to one edge of the drawing board, and is provided with a locking device for securing the same in different positions along the rail. My invention is broadly characterized by this that the instrument is also provided with such a device, preferably adjustable, that by 1 means of the same the ruler may be given a step-bystep motion along the rail.

The ruler or straight edge is suitably provided with a longitudinal rail and with a 'movable arm guided on this rail, which arm serves as triangle and is provided with looking and moving devices of the same kind as provided for the ruler. This arm is preferably made of two parts which may be turned relatively to each other and be secured in different angles of adjustment.

In the accompanying drawing I have- 3 shown an embodiment of my invention by way of example, Figure 1 showing a side view and Fig. 2 a plan view of the same. Fig. 3 shows to a larger scale a section on the line AB in Fig. 2, and Fig. 4; shows, also to a larger scale, a side view of the locking devices for the arm on the ruler.

The drawing edge with a rail 2 preferably made of metal and secured to the drawing board by means of screws or the like. The ruler or straight edge 3 is guided on this rail 2 which projects into slots 4: in the plate 5 preferably det acha bly secured to the ruler 3. In order to facilitate'the moving of the ruler along Elie rail the plate 5 bears against the rail-2 )7

rollers

6 and 9 taking upthe pressure on the upper edge of the ruler or its weight when the drawing board is inclined, are rigidly journaled in the plate 5, while the opposite rollers 7 and 8 are preferably resiliently journaled, for instance in a flexible bracket 38 as shown in Fig. 3, in order that the ruler shall not be able to stick on the rail 2.

A lever 11 is pivoted at 10 in the plate 5 and is provided with a slot entered by the rail 2. This slot is of such width that when means of rollers, balls or the like; The

board 1 is providedat one rail 2, the rail is free in the slot so that the ruler may be moved, but when, the lever 11 is held in the position shown in Fig. 2, actuated by a'spring 12, it will catcharound the rail 2 thus preventing the ruler 3' from being moved; 7 I

A screw-13 is'also journaled in the plate 5 which screw is provided with a head 14 for turning the same. By turning the screw 13 a stop 15 on the same is moved. A lever 16 is pressed against the stop 15 by the spring 12 on the screw 13. A fixed stop 17 for the lever 16 is provided in the plate 5.

By turning the screw 13 the lever 16 is.

ment with the rail 2. By pressing the levers '11 and 16 toward each other simultaneously,

the lever 16 will engage the rail 2 while the lever 11 when pressed against the fixed arm 13, is released from the rail 2. Owing to the pressure on the lever 11 the ruler 3 is then pressed. down.vard until the stop 17 hills "hiainst the lever 113. When the lever 11. is now released while pressure is still exerted on the lever 16, the lever 11 will lock the ruler to the rail in its new position, and when then the lever 16 is released it will be moved back by the spring 12 against the adjustable stop 15 and out of engagementwith. the rail 2. by renewed pressure on the levers it and 16 the rulers will be moved another step downward. The length of the step is varied by adjustment of the stop 15, whereby the initial position of the lever 16 becomes more or less distant from the stop 17.

The ruler is provided with a longitudinal rail 19 on which an arm is guided, which serves as a triangle This arm consists of a lower part or a plate 20 sliding on the rail 19 by means of rollers or balls 21, 22, and 2a. A lever 26 is pivoted at in the plate 20. This lever 26 corresponds, as regards purpose 11 of the ruler. This lever 26 is actuated by a spring 27 on a rotatable screw 28 carrying an adjustable stop 29 for the lever 30 which corresponds to the lever 16. A fixed stop 31 for the lever 30 is also provided in the plate 20. llhe arm may thus be secured to or moved step by step along the ruler in the same manner as above described for the ruler.

In order that the said arm may be used in different angles of adjustment relatively to the ruler, the following arrangement is provided: A disk 32 is pivoted to the plate 20 at 33 and may be secured to the plate at different angles of adjustment by turning the handle 3% which is rotatably secured to the plate 20 and provided with an oblique surface so that when turned it will press the lock-plate 39 against the disk 32, as will be understood by reference to Fig. l. The arm proper, 35, is also pivoted at 33 and is provided with a graduated disk 36, which may be adjusted relatively to the disk 32 and secured to the same in diiferent positions by means of a strap 37 eccentrically journaled in the disk 32 as shown in Fig. 4t, or by means of some other suitable device. In order to set the arm along a line on the paper the handle 34: is turned, while the strap 37 remains closed, and the arm 35 is swung to the desired position, whereupon the handle 3i is again turned into closing position. If it is desired to draw a line at a certain angle to the first one, the strap 37 is opened and the arm 35 is adjusted relatively to the disk by means of the graduated disk 36.

The last described arrangement is useful not only for drawing a. line at an angle to and operation, to the lever a certain line of the drawing on the board to which the ruler is secured, but also for transferring a, drawing from a drawing board to another, as is the case for instance when enlarging or reducing a drawing. The arm 35 is then adjusted on the main drawing in the described manner, and the ruler together with the arm is then easily removed to anothaboard on which the desired line is then drawn along the arm 35.

My invention is not limited to the embodiment above described, which has been referred to by way of example only.

l Vhat I claim is 1. In a drawing instrument for section lining and for laying down and measuring angles, the combination of a drawing board, a rail secured to one edge of the board, a. ruler, means for guiding the ruler along the rail, a lever pivoted to the ruler, a spring normally pressing said lever into engage ment with the rail, a second lever normally held by the said Spring out of engagement with the rail but arranged to engage the rail when turned, a fixed stop for the second lever, and an adjustable stop for said second lever, substantially as and for the pnrpose set forth.

2. In a drawing instrument for section lining and for laying down and measuring angles, the combination of a drawing board, a rail secured to one edge of the board, a ruler, means for guiding the ruler along the rail, said means consisting of two pairs of rollers, one roller of each pair being rigidly mounted and the other resiliently mounted, a locking device for securing the ruler to the rail in different positions, and means for imparting to the ruler a step-bystep motion along the rail, substantially as and for the purpose set forth.

3. In a drawing instrument for section lining and for laying down and measuring angles, the combination of a drawing board, a rail secured to one edge of the board, a ruler, means for guiding the ruler along the rail, a locking device for securing the same to the rail in difierent positions, a rail mounted on the ruler, an arm, means for guiding the arm along said rail on the ruler, a locking device for securing the arm to said rail in difierent positions, and means for imparting to the arm a step-by-step motion along said rail, substantially as and for the purpose set forth.

l. In a drawing instrument for section lining and for laying down and measuring angles, the combination of a drawing board, a rail secured to one edge of the board, a ruler, means for guiding the ruler along the rail, a locking device for securing the same to the rail in different positions, a rail mounted on the ruler, a. plate, means for guiding said plate along said rail on the ruler, a locking device for securing the plate disk, means for locking said second disk to to said rail in different positions, means for vthe first-mentioned disk in different angles imparting to the said plate a step by-step of adjustment, and an arm secured to said 10 motion along said rail, a disk pivoted to second disk, substantially as and for the said plate, means for locking said disk to purpose set forth.

said plate in different angles of adjustment, 7 r

a second disk pivoted to said first-named GUSTAF LONNQVIST.

Copies of thts patent may be obtained for five cents each, tiy addressing the Commissioner 0:! Patents. Washington, D. 0.