WO2005035268A1

WO2005035268A1 - Multifunction gauge

Info

Publication number: WO2005035268A1
Application number: PCT/CZ2003/000074
Authority: WO
Inventors: Petr John
Original assignee: Metrie Spol. S R.O.
Priority date: 2003-10-13
Filing date: 2003-12-18
Publication date: 2005-04-21
Also published as: CZ296691B6; RU57445U1; AU2003285262A1; CZ20032784A3; UA81361C2

Abstract

Multifunction gauge for measuring length, angles, surface perpendicularity or drawing of circles containing at least one rule (1).

Description

MULTI-FUNCTION GAUGE

Art Domain

The invention conception of multifunctional gauge with use for mechanical metering of length, angles, surface perpendicularity or drawing of circles is suited either for carpenters, joiners, glaziers, painters, masons or another craftsmen, or for fitting rooms, maintenance and handymen use.

Present prior art

In a current time it is used for metering of length, angles, or surface perpendicularity by mechanical way, variety of rulers, protractors, T squares or multifunction drawing instruments, whose permit more or less accurate metering. This either single-purpose or multi-purpose gauges made of various materials such a wood, metal, alloys or plastic, make for user possible find out the required gauges with more or less comfort.

Apart from another solutions the patent CZ 279 352 is noted. This Patent solve construction of all-purpose protractor, which is consisted of semicircular plateau disc which is rollover way clamped to firm plateau arm and to the disc midpoint is added (with spin ability) another plateau arm equipped with subtraction index. This more complicated metering mechanism, serving only to metering of the angles and not to creating them and it is equipped with two additional parallelograms for repelling of metering arm out of plateau disc. Disadvantage is ability of metering just inner angles in intervals 0°-180 ° degree's, but angles 0 , 180 and angles close to them are impossible from construction consideration to change.

It is also known solution according to patent GB 2 352 039 dealing with device able to metering two bulks all at once. This device is consisted of two rulers, rectangle cross-sectioned with midpoint lengthwise opening and mutually connected by joint, which is equipped with plateau disc.

Both rulers are able to adjust in way where is possible to metering not only angle between two arms but their lengths as well.

Disadvantage of this solution is that base surface of rulers are not in the same level, this device is just for metering but not for creating of the angles and tightening midpoint joint is not equipped with any indexing appliance for step (jump)function of rulers into desired angles.

The object of publicized application US 2003/0074800 is construction of telescopic ruler with fixation of the drawing-out part position. The base is ruler with bilateral scale that is equipped from bottom with T-groove for guidance of the rectangular cross-sectioned narrower ruler. This inner ruler is possible to uncouple from basic ruler always about the certain step, whose size identified by distance of the openings created in basic ruler.

Push out ruler is than fixated in elected position by spring-loaded peg, which lock-on into basic ruler opening. Disadvantage of this solution is that serve only to extension of allowance scale of basic ruler, whereas moreover subtracting scale do not lies in same bisector with basic ruler scale, which has influence on accuracy of metering. In general knowledge is also solution of protractor in conjunction with folding rule according to patent DE 195 34 059, which is about single-purpose accessory that allows metering of the angles by the help of folding rule with hold-down possibility of required angle. Disadvantage of this construction is that swivel joint for determination of the angles it is not equipped with any indexing apparatus for angles setting spontaneous run.

The common disadvantage of all known solutions is that they do not allow the complex utilize, that mean after simple operative transposition or replacement of constructional parts metering of the distance, angles, surface perpendicularity or creating of the angles or drawing circles namely with warranted accuracy of transacted operations.

Essence of the invention

Mentioned disadvantages remove greatly multifunction gauge for mechanical metering of length, angles, surface perpendicularity, or drawing of circles, containing at least one ruler whose moulded body is at least in one end part modified for interface of the counterpart. Essence of the invention is that in lower base of median part of the ruler body is lengthwise dovetail inner guiding groove created, whereas near at least one face front of the ruler is in upper base of the body minimally one fixation opening, for snapping of the connector safety peg or connector parts of the swivel joint, engaged into end position in inner guiding groove.

Further essence of the invention is that on upper base of the body is in parallel with inner guiding groove lengthwise dovetail outer guiding groove created, for over thrust of the handle, completed with pencil holder when needed and the connector is created with flat laminae, whose form and outside dimension correspond to dimensions of the ruler inner guiding groove and it is equipped at least by two safety pegs, imbed in connector, regarding to top face of the laminae in vertically extensible way.

Further essence of the invention is that on lower laminae part are caverns created, that are connected with upper part of guiding openings, whose size basically matches to size of ruler fixating openings, where are safety pegs set in caverns, that are fast connected to leaf springs imbed in braces that closing caverns, whereas diameter of safety pegs allows insert in imbed in guiding grooves.

Further essence of the invention is that swivel joint is created with mutually pivoted imbed of lower arm and upper arm, which are coupled with median peg equipped with spring-loaded hold down roller and they are mutually set up so the lower parts of both arms are in same horizontal level. Advantage is that lower arm of the swivel joint is created with lower bearing part on whose one sidewall equipped with lower stop moulding is first connector part created, whose form and outer dimension correspond to dimension of ruler inner guiding groove and is equipped with safety pegs that are fitted in the area of her lengthwise axes and at the same time second sidewall of lower bearing part is shaped into semicircle and in the center of lower bearing part is connecting opening for forcing-in of median peg created, whereas around connecting opening is on top face of lower bearing part is annulus lower gearing tooth system created so that his outline part correspond with peripheral semicircular edge of lower bearing part and spacing of his tooth matches to smallest possible step at setting of the angles of the arms. Simultaneously is upper arm created with upper bearing part on whose one sidewall equipped with upper stop moulding is created second connector part, whose form and outside dimension correspond with dimension of ruler inner guiding groove and is equipped with safety pegs, that are fitted in the area of her lengthwise axes, whereas on bottom surface of the upper bearing part is annulus upper gearing tooth system created, that is dimensionally identical with lower annulus gearing tooth system of the lower bearing part and top face of lower bearing part is equipped with angular subtraction scale created along perimeter of his semicircular outline.

In advantageous design is handle of the gauge created by mutually cushioning imbed outer handrail and inner handrail, where outer handrail is in her lower part equipped with lateral detent, whose spacing and form matches to form and cross-section of ruler outer guiding grooves. It is optimal, when inner handrail is imbed in inner pocket of outer handrail, which is on sides of inner pocket equipped with gauge-grooves and in her lower parts with frontal detents, whereas inner handrail is equipped with lateral tapped holes for mounting of positional element and in upper part with frontal recess for imbed of spiral spring. By a setup of gauge for drawing, pencil holder consist of flat girder, which is equipped on both forefronts with frontal notches, whose form and cross-section correspond with proportions of handle frontal detent and on lower side with dovetail guiding notches, whose spacing and form correspond with shape and cross-section of ruler outer guiding grooves, whereas girder is in his middle part equipped with subtraction opening and near of one sidewall is bilaterally extended into pads and in them there are fixture openings for gripping of the pencil created.

By a setup of gauge for drawing of the circles is cuspidal holder created with bearing pad, which is formed for removable over thrust of connector or connector parts of the swivel joint and in which is imbed sliding cuspidal button in whose median ductile is peak fixated, whereas upper position of cuspidal button is determinate with spring element, which is from bottom fixated with blank lid . For gauge gripping needs is on smooth surfaces sucker holder makeup for removable over thrust of the connector or connector parts of the swivel joint and inside of him is sliding sucker button imbed, on whose bottom is gripped bell-shaped sucker.

Finally the matter of invention is that T-square is created with flat strip, which is on his middle part equipped with transverse cut out and inside of him is guiding liner equipped with lengthwise notch with cross-section corresponding to cross- section ruler inner guiding groove, whereas guiding liner is in cut out secured with supporting laminae equipped with hold-down opening.

Multifunction gauge achieving according to invention higher effects that construction provide complex metering of length and angles, creating angles or drawing circles by the help of simple change of particular parts. Compactness of connection of gauge parts allows metering with big accuracy even with unprofessional use in household or fitting rooms. Description of the pictures on enclosed plans

Particular examples of multifunction gauge illustrated on enclosed plans, where:

fig.1 is axonometric view of base part of gauge- ruler fig.2 is axonometric view of median part of gauge of length created with two rulers fig.3 is axonometric view of median part of gauge equipped with swivel joint fig.4 is axonometric view of configuration of gauge with T-square fig.5 is axonometric view of configuration of gauge with T-square connected through swivel joint fig.6 is axonometric view of part of gauge where is ruler equipped with handle and carpenters pencil holder fig.7 is axonometric view of swivel joint of gauge fig.8 is lengthwise axial cut of swivel joint fig.9 is plot view of swivel joint fig.10 is transverse cut of swivel joint in level of safety peg in pressed down position fig.11 s lengthwise axial cut of lower part of swivel joint fig.12 s plot view of lower part of swivel joint fig.13 s lengthwise axial cut of upper part of swivel joint fig.14 s plot view of upper part of swivel joint fig.15 s lengthwise axial cut of connector fig.16 s plot view of connector fig-17 s transverse cut of connector in level of imbed of safety peg fig.18 s lengthwise axial cut of median part of T-square fig.19 s plot view of median part of T-square fig.20 s axonometric view of cuspidal holder fig.2i s lengthwise axial cut of cuspidal holder fig.22 s plot view of cuspidal holder fig.23 s axonometric view of sucker fig.24 s lengthwise axial cut of sucker holder fig.25 is plot view of sucker holder fig.26 is scheme view of handle fig.27 is plot of handle fig28 is side view of handle fig.29 is scheme view of outside part of handle fig.30 is scheme view of inside part of handle fig.31 is plot view of pencil holder fig.32 is lengthwise axial cut of pencil holder

Examples of carry out of the invention

Basic element of multifunction gauge is ruler 1 illustrated on fig.1 and created with flat lengthwise body 101 with basically trapezoidal cross-section, which is bilaterally sloped and broaden out from direction from upper basis 102 to lower basis 103. In median part of lower bases 103 is lengthwise dovetail inner guiding groove 104 created, in parallel with which there are on upper bases 102 sideways lengthwise dovetail outer guiding grooves 105 created. Off at least one ruler 1 forefront 106 is in upper base 102 at least one fixation opening 107 created, allowing adjustment of required position of elected counterpart such as connector 2, T-square 3, swivel joint 4.At side edges 108 of lower bases 103 they are partly into profile of the body 101 guiding planchettes 109 inserted (rather from metal) and partly there are length subtraction scales 110 engraved or printed created.

To basic ruler is possible to demountable join on various utilities and accessories either directly or by the connector 2, illustrated on fig.15 to 17. Connector 2 is created with flat laminae 201 , whose form and outside dimensions correspond with dimensions of ruler 1 inner guiding groove 104, allowing mutually sliding imbed of both part 1 and 2, whereas on sides is laminae 201 equipped with start up edges 202 allowing easy sliding of connector 2 into inner guiding groove 104. On the bottom side of the laminae 201 there are caverns 203 created which are connected to top side of laminae 201 with guiding openings 204, whose size basically matches to rulerl fixation openings 107. There are safety pegs 205 set in caverns, which are fasten together with leaf springs 206 imbed on braces 207 closing caverns203 from the bottom in way that connector 2 make compact unit.

Diameter of safety pegs 205 made in way to allow their sliding imbed into guiding openings 204 and their head is lenticulary shaped.

By the help of connector 2 is possible to add ruler 1 to T-square 3, how is illustrated on fig. 4 T-square is created with rectangular strip 301 , which is in its middle part provided with transverse cut 302, how is perceptible from details on fig.18 and fig.19. In cut out 302 is imbed guiding liner 303 equipped with lengthwise cut out 304 with cross-section corresponding with cross-section of rulerl inner guiding groove 104. Guiding liner 303 is in its cut out 302 secured with supporting plate 305 provided with hold-down opening 306 allowing transit of connector 2 safety pegs 205. Guiding liner 303 and supporting plate 305 are demountable fastened to basic flat strip 301 by the help of countersunk screws 307.

For metering or creating of the angle is possible to basic ruler 1 add swivel joint 4, whose performance as a whole or separate parts illustrated on fig.7 to 14. Swivel joint 4 is created with upper arm 42 and lower arm 41 , which are mutually pivoted imbed and are coupled with median peg 43, which is in top part provided with thread 431 , on which is screwed cushioning hold-down roller 44, whose surface is provided with milling 441. On the lower forehead of hold- down wheel 44 is lower circular undercut created 442 inside of him is compressive spring 443 imbed and on upper forehead of hold-down wheel 44 is upper circular undercut 444 created ,as well inside of them is stop ring 445 imbed, which is gripped to median peg 43 and delimitating upper lift of hold- down wheel 44.

Lower arm 41 created with lower bearing part 411 on whose one sidewall, provided with lower stop moulding 412 is first connector part 413 created. Form and outside dimension of first connector part 413 correspond with dimension of ruler 1 inner guiding groove 104 and make possible mutually sliding imbed and connection of both part 1 and 4, whereas on sides is first connector part 413 modified for easy insertion into inner guiding groove 104. First connector part 413 is at the same time equipped as well as connector 2 with safety pegs 205, whose are mounted in the area of lengthwise axis of first connector part 413 constructive by analogy and they have also same function.

Second sidewall of lower bearing part 411 is shaped into semicircle, how is perceptible above all from fig. 12 and in the centre of lower bearing part 411 is connecting opening 414 for forcing-in of median peg 43 created. Around connecting opening 414 is on the top face of lower bearing part 411 annulus gearing tooth system 415 created, namely so his outline part correspond with peripheral semicircular edge of lower bearing part 411 and spacing of his tooth matches to smallest possible step at setting movement of arm 41 and 42 angles, generally about 1 degree.

Upper arm 42 of the swivel joint 4 is basically mirrored design of lower arm 41 , how is perceptible above all from fig. 14 and is created with upper bearing part 421 , on whose one sidewall, provided with upper stop moulding 422, is second connector part 423 created to at mutual put together of both arms 41 42 lower sides of both connector parts 413 423 was in the same horizontal level. On bottom surface of upper bearing part 421 is upper annulus gearing tooth system

424 created, which is dimensionally identical with lower annulus gearing tooth system 415 of lower bearing part 411. As well second connector part 423 is equipped with safety pegs 205 for connection with ruler 1 or T-square 3. Finally is top face of upper bearing part 421 provided with angular subtraction scale

425 created at perimeter of his semicircular outline.

For allowing of easier manipulation with some of metering gauge formations or only with rulerl is this ruler 1 possible to equip with handle 5 illustrated in detail on figs 26- 30, which is possible to equip with further additional accessories such as pencil holder 6 illustrated on fig. 31 and 32, cuspidal holder 7 figs. 20- 22 or sucker holder 8 figs. 23-25.

Handle 5 is created with outer handrail 51 , in whose inner pocket 511 is sliding imbed of inner handrail 52 created.

Outer handrail 51 is on sides of inner pocket 511 provided with distance grooves 512 and is in its bottom part, partly with side detents 513, whose spacing and form matches to shape and cross-section of rulerl outer guiding grooves 105 and partly with dovetail shaped frontal detents 514, allowing demountable connection with further accessories. Inner handrail 52 is provided with side tapped holes 521 for mounting of positioning elements 522 created for example with sink-hole screws and in top part with front recess 523 for imbed of spiral springs 524. At make up of both handrails 51 ,52 coming to mutually cushioning imbed.

In case of requirement of circles protraction is before over thrust on the ruler 1 handle 5 completed with pencil holder 6 namely by over thrust one of his side notches 611 on selected front detent 514 of outer handrail 51. The pencil holder 6 consist of flat girder 61 , which is provided partly with on both face fronts with frontal notches 611 , whose form and cross-section matches to dimensions of handle 5 frontal detent 514 and on lower sidewall with dovetail guiding notches 612, whose spacing and form matches to shape and cross-section of rulerl outer guiding grooves 105. Girder is in middle part provided with subtraction opening 613 and near one sidewall is bilaterally broaden into pads 614 in whose are fixture openings 615 for gripping of the pencil 9 created. Pencil holder is possible to place from both sides of the handle 5 and direct it on arbitrary wall of the ruler body 101 even in way that pencil can be situated from one or another side of the rulerl and at the same time from one or another side of the handle 5. For obtaining of firm pivot point for drawing of the circles or arches is possible with the help of connector 2 to fix cuspidal holder 7 to the ruler 1 illustrated on figs.20-22. Cuspidal holder is created with bearing foot 71 , whose median part is modified for removable over thrust of the connector 2 in case that there is connecting notch 72 created from the below interconnected with formed top face by distance opening 73. On side from connecting notch is in bearing foot 71 cuspidal button 74slide imbed, in whose median ductile 741 is peak 75 fastened. Top face of cuspidal button 74 is delimitated by the instrumentality of spring element 76, for example compressive spring, which is from the bottom side fixated with blank lid 77.

At impossibility of using cuspidal holder 7 for example in glaziers or when drawing on hard surfaces, where is not possible to press in the peak is possible to complete ruler 1 with sucker holder 8 , whose construction design is basically identical just with difference that bottom side of sucker button 81 is bell shaped sucker 82 gripped, made for example from India rubber. By pressing of sucker button 81 the sucker 82 fasten to used material, whereby come to zero in of the gauge and is possible to start with drawing of circles or arches.

At needs of metering of longitudinal dimensions is possible to use separate ruler 1 or formation of more rulers 1 connected with the connector2 illustrated on fig.2.

Ruler 1 is possible to connect with the help of swivel joint 4 (fig.3) which is possible to use for connecting of T-square 3, illustrated on fig.δ.T-Square 3 is possible to connect with the help of connector 2 to ruler 1 and ruler 1 can be equipped with the handle 5 completed with pencil holder 7 (fig. 6) or completed with further accessories such as cuspidal holder 7 or sucker holder 8. All assembly and dismantling of gauge single parts is by the help of simple dovetail elements with mutual fixation of position by pre-spring safety pegs 205. Described designs are not one and only possible construction design according to invention, but is obvious that design of gauge single parts can be changed, depending of using different constructional materials, as well as design of elemental, provisory or connective parts.

Industrial application

Multifunction gauge according to invention can be used in various professions such as carpenters, joiners, glaziers, painters, builders or other craftsmen's as well as for workshop using or maintenance and handyman house-works.

The list of reference numerals

1. Ruler

101 body

102 upper basis

103 lower basis

104 inner guiding groove

105 outer guiding groove

106 forefront

107 fixation opening

108 side edge

109 guiding planchette

110 length subtraction scale

2 Connector

201 laminae

202 start-up edge

203 cavern

204 guiding opening

205 safety peg 06 leaf spring

207 brace

3 T-square

301 strip

302 transverse cut out

303 guiding liner

304 lengthwise cut out

305 supporting plate

306 hold-down opening 07 countersunk screw 4. Swivel joint lower arm 1 lower bearing part 2 lower stop moulding 3 first connector part4 connecting opening 5 lower annulus gearing upper arm 1 upper bearing part 2 upper stop moulding 3 second connector part4 upper annulus gearing 5 angular subtraction scale median peg 1 thread hold-down roller 1 milling2 lower undercut 3 compressive spring4 upper undercut 5 stop ring Handle outer handrail 1 inner pocket2 distance groove 3 side detent4 front detent inner handrail 1 side tapped hole2 track point3 front recess4 spiral spring Pencil holder girder 1 front notch2 guiding notch3 subtraction opening4 pad5 fixture opening Cuspidal holder bearing foot connecting notch distance opening cuspidal button 1 median ductile peak spring element blank lid Sucker holder sucker button sucker Pencil

Claims

PATENT CLAIMS

1. Multifunction gauge for mechanical metering of length, angles, surface perpendicularity or drawing of circles, involving at least one ruler, whose molded body is at least in one end point adapted for joining of the counterpart, wherein in the middle part of the lower basis (103) of the ruler (1) body (101) is lengthwise dovetail guiding groove (104) build up in way that near at least one of the ruler (1) forefront (106) is in body (101) of the upper basis (102) build up at least one fixation opening (107) for snapping of the safety peg (205) of connector (2) or connector parts (413), (423) of the swivel joint (4), plugged in end part of inner guiding groove (101).

2. Multifunction gauge as specified in claim 1 , wherein on the upper basis (102) of the body (101) are in parallel to inner guiding groove (104) lengthwise dovetail outer guiding groove (105) build up for insertion of the handle (5) amended with pencil holder (6) optionally.

3. Multifunction gauge as specified in claims 1 and 2, wherein connector (2) constructed by flat lamiae (201), shaped and sized just as size and shape of the inner guiding groove (104) of the rule (1) and is equipped at least with two safety pegs (205) imbed in connector (2) with regard to upper surface of lamiae (201) vertically in a sliding way.

4. Multifunction gauge as specified in claim 3, wherein lower side of the laminae (201) caverns (203) are composed, connected through to upper side of the lamina by guiding openings (204), whose size is basically same to size of fixating opening (107) of the ruler (1), where are in caverns (203) safety pegs (205) mounted with leaf springs (206) imbed on braces (207) closing caverns (203), wherein diameter of the safety pegs (205) enable theirs slide imbed into guiding openings (204).

5. Multifunction gauge as specified in claim 1 , wherein swivel joint (4) is build up from mutually imbed lower arm (41) and upper arm (42) coupled by median peg (43) equipped with hold-down roller (44) and mutually imbed that the lower sides of both arms (41), (42)are in same horizontal level.

6. Multifunction gauge as specified in claim 5, wherein lower arm (41) of the swivel joint (4) is build up by lower bearing part (411), on whose one side wall equipped with lower stop moulding (412), is build up first connector part (413), whose form and outer proportion correspond with the proportion of the ruler (1) inner guiding groove (104) and is equipped with safety pegs (205), that are installed in the area of her lengthwise axes, at the same time second side wall of the lower bearing part (411) is sculptured into semicircle and in the centre of the lower bearing part (411) is connecting opening (414) created for forcing-in of the median peg (43), whereas around of the connecting opening (414) is on top face of the lower bearing part (411) annulus gearing (415) created that way, that his outline part correspond with peripheral semicircular edge of the lower bearing part(411) and spacing of his tooth matches to smallest possible step at setting movement of the arms (41) and (42) angles.

7. Multifunction gauge a specified in claims 5 and 6 , wherein upper arm (42) is created by upper bearing part (421) on whose sidewall equipped with upper stop moulding (422) is second connection part created, whose form and outer proportions correspond with proportions of the ruler (1) upper guiding groove (104) and it is equipped with safety pegs (205), that are installed in the area of her lengthwise axis whereas on the bottom surface of the upper bearing part (421) is semicircular upper annulus gearing (424) created dimensionally identical to lower annulus gearing (415) of lower bearing part (411) and a top face of the upper bearing part (421) is equipped with angular subtraction scale created at perimeter of his semicircular outline.

8. Multifunction gauge as specified in claims 1 to 7 , wherein handle (5) is created with mutually spring-back loaded outer handrail (51) and inner handrail (52), where outer handrail (51) is in her lower part equipped with side detent(513), whose spacing and form matches to shape and cross- section of the ruler (1) outer guiding groove (105).

9. Multifunction gauge as specified in claim 8, wherein inner handrail (52) is imbed into inner pocket (511) of the outer handrail (51), which is on sides of inner pocket (511) equipped with distance grooves (512) and in bottoms by frontal detents (514), whereas inner handrail (52) is equipped with side tapped hole (521) for mounting of the track points (522) and in upper parts with frontal recess (523) for imbed of the spiral spring (524).

10. Multifunction gauge as specified in claim 9, wherein pencil holder (6) consist of flat girder (61) that is equipped on both forefronts with frontal notches (611), whose shape and cross-section matches to proportions of handle (5) frontal detent (514) and on the lower side with dovetails guiding notches (612), whose spacing and form matches to the shape and cross-section of the ruler (1) outer guiding grooves (105), whereas girder (61) is equipped with subtraction opening (613) in the middle part and near one of the sidewalls bilaterally extended into the pads (614) in which are fixture opening (615) for gripping of the pencil (9) created.

11. Multifunction gauge as specified in claims 1 to 10 , wherein cuspidal holder (7) is created with bearing foot (71) that is formed to over thrust of the removable connector (2) or connector parts (413), (423) of the swivel joint (4) and where is imbed cuspidal button (74)(slip-in way) in whose median ductule (741) is peak (75) fixated, whereas top face of the cuspidal button (74) is delimitated by spring element (76), which is from the bottom fixated with blank lid (77).

12. Multifunction gauge as specified in claims 1 to 10 , wherein sucker holder (8) is formed for exceptional over thrust of connector (2) or connector parts (413,423) of the swivel joint (4) and the sucker button (81) imbed (slip in way), on whose bottom is bell-shape sucker (82) gripped.

13. Multifunction gauge as specified in claims 1 to 12 , wherein T-square (3) is created with rectangle shape flat strip (301), which is in its centerpiece equipped with transverse cut out (302) in which is imbed guiding liner (303) equipped with lengthwise notch (304) with cross-section corresponding to cross-section of ruler (1) inner guiding groove (104), whereas the guiding liner (303) is in cut out (302) fasten down with supporting laminae (305) equipped with hold-down opening (306).