DE1673864C2 - Leather ruler - Google Patents

Description

With the known scales made of wood, they have sufficient spring action. But this is true ben it was customary to connect the individual only partially and only with metallic links one below the other at both ends of each, whereas with plastic this is insufficient to attach a shoe made of sheet metal to the limb, where 50 is present. But because of the low wall the two shoes of the links to be connected strengthens the metal links a high surface pressure by rivets or bolts or similar elements and also the bores as a rule connected to each other. Most of the time it was punched in this way and therefore sharp-edged is also here even a coil spring to prevent the bolt from increasing wear., see, so that an axial suspension of the two members 55 The present innovation is therefore the opposed to each other is possible. This suspension was of necessity, a low-wear, durable, inexpensive, so that the locking elements are interlocked and easy to create and last for a long time be pressed and the links in the desired articulated connection between two remaining free of play by the Rastclemente fixed positions held scale members made of plastic will. The disadvantage of such scales was before the creation of a scale.

The solution to this problem is that the

Wooden link was not durable enough so that one link of a joint had a concen-scale In terms of dimensional accuracy, the ring currently lying trisch to the hole for the bolt is important could meet the usual high standards. has bead, which with a corresponding ring Dariiber In addition, the guidance of the two links 65 was a bearing on the other link in every rotational position at the connection point, namely on the rivet, and the suspension of the bolt by an in bad and not precise enough. one attached to the outside of the limb

So was z. B. proposed (USA.-patent groove arranged spring is effected.

673 864

3 4

The spring is advantageous as the hinge for the articulated connection in a transverse bore in the longitudinal section.

of the bolt lying spring wire formed. binding of links 2 and 3 of the figure! enlarged

The groove is expediently shown in which the annular bead is located. Again, the bolt 4 can be seen,

lowing member arranged, the head 5 is sunk in the member 3 and with his

The main advantage of this solution is that 5 cambered end faces cover the outer surface of the GHe

that between the two links an exact ver des 3 protrudes slightly. The other end of the BoI

binding is present, which has a double stitch 4 over the outer surface of the other GHe

tion causes. At one point, namely, the bolt itself of the 2 is also slightly in front and is close to it

tls guide element is used, which is provided with the transverse bore 6 through the end face. The SoI

Bolts are tied together. On the other hand io zen 4 is preferably made of a plastic,

however, the two links are additionally designed to accommodate the through the transverse bore 6

against each other by the spiral spring inserted in the annular groove of one GHe of the bolt 4? provided

of the lying annular bead of the other link opposite longitudinal groove 8 is less in both of its end regions

led each other. In addition, the Rastele- are deeper than in their middle area and deepen

menic by the axial suspension of the bolt, which 15 of its two ends against the hole for the

It can be much softer than before, less bolt 4, for example, straight. The two

activated so that their wear and tear is considerably reduced. are in the end

is reduced. It turns out that the longitudinal groove 8 also extends in the axial direction. This training the

Removal of the links when opening the longitudinal groove still allows axial movement of the bolt 4

a guide of the two members against each other in front 20 in the member 2 against the spring force of the spiral spring 7 and

is tied, both by the bolt and by a resilient, mutual lifting of the nci-

also by the formed from the annular bead and annular groove the links 2 and 3 on the S .. -He of the bolt 4. The

Camp; because during the rotary movement of the hinged spiral spring? is designed as a round wire or ribbon-shaped

kes, the two links are formed by the amount of the.

Detent elements are distanced and at the same time the ring is concentric on the inside of the link 2

bead slightly raised in the associated annular groove, to. · Bore for the bolt 4 arranged short

so that wear of the inner bearing parts forms annular bead 9 together with the on the inner

by the rotational movement with security avoided side of the link 3 provided, corresponding

will. Only when the locking elements engage , the annular groove 10 fills the longitudinal displacement of the two

also the ring bead fully back into the associated 30 links 2 and 3 preventing hinge. The two

Ring groove and gives the two links the full links 2 and 3 are therefore rotatable around the ring bead 9

Storage again. This guarantees uaß bar. where the bolt and the spiral spring? the

the required dimensional accuracy also holds together over a long link in the transverse direction and therefore

Service life can be maintained. may lie loosely in the holes in the links.

The invention is described below with reference to FIG. 35. The annular bead 9 is preferably somewhat higher than that

Drawing explained for example, It shows the inner surface of the link 2, so that between the in-

Fig. 1 shows a detail of a folding rule nenflächencn of the two members 2 and 3 a gap

according to the invention is present in plan view and in side surface.

sees as well as one of the articulated connections in the longitudinal die for mutual engagement of the links 2

section, 40 and 3 provided on their inner surfaces cams

Fig. 2 shows two interconnected members of the 11 and depressions 12 are known per se

Fig. I in a separate representation, enlarged in a wedge-shaped manner and indicate

Top view of the inner ropes and in the longitudinal section. sloping side walls. By this measure

According to Fig. 1, two each are made of a plastic, on the one hand a perfect '.

if links I, 2 or 2, 3 of a cut-out 45 on the other hand, an easier twisting from the engraved

wisely established folding rule achieved by a steady position. The link 3 is also on his

corresponding inner surface provided at the end of the limbs with additional, smaller depressions

Bores inserted bolts 4 provided with articulated mitcinan-, in soft when turning the links 2. 3 the

the connected. Each bolt 4 has a head 5 cams II partially engage. This creates a

which is sunk into an abiieschwächti on the outer surface of the 50

Gliedercndcs provided recess lies. The opposite rotation by 90 eneiclit.

the end of each bolt 4 is connected to a cross boom.

tion 6 provided, through which one as a straight precision rod results in the advantage that all links

the spiral spring 7 formed by the beam piece is inserted. are designed the same and together with the intended

The spiral spring 7 lies in a cam at the other end. Ring bulges. Ring grooves. Holes and

of the link on its outer surface, the I.iingsnuten in one operation and in one

Longitudinal groove 8. made single piece of plastic. e.g. spnt / t

The link ends are on their inner surfaces with can be. In addition to the links, there are only two further L ^: an annular bead 9 or a ring bead 9 on it, namely an annular groove 10 that accommodates the bolt 4, both of which are concave and the spiral spring? required, which also have simple Irish to the holes for the bolt 4 arranged shapes. Beyond that is togetherness. In addition, the link ends on their inner meshes of the individual links to the limb surface with cams 11 or these corresponding rods are very simple, in that only the bolt 4 is provided in the recesses 12, which enable the superimposed bores of two links 1, 2 or . 2, 3 in 65 den and the wire-shaped spiral spring? slot 8 and made possible by the transverse bore 6 of the bolt 4 must be inserted into the two longitudinal layers rotated by 180 ° relative to one another.

In Fig. 2 is a plan view of the inside and the folding and opening of the described

NEN folding rule takes place in the usual way, but is due to the resilient storage in the axial direction of the hinge pin 4 is made much easier by the fact that the links are locked in place when the links are rotated Are the cams 11 against the force of the spiral spring? be lifted. Through when twisting Occurring lower friction of the parts sliding on each other, especially the edges of the cams 11 and the depressions 12, is not only a comfortable, compared to known folding rules, effortless use, but above all a very low level of wear and tear. Furthermore, as the rotating element the annular bead 9 formed by the hinges of two members has a larger diameter than the bolt 4 has, is a more precise guidance of the articulated links even with heavy use of the folding rule is guaranteed than by a thin one, the two limbs both longitudinally also in the transverse direction frictionally connecting bolts or rivets. In addition, the ring bead 9 allows between the two interconnected links without a washer or the like. An interspace to create, so that there is a risk of damage to the scales printed on the links when turning the limbs and in the collapsed state is greatly reduced. Protecting the pressure the members in the collapsed state also serve the protruding, cambered ends det Bolt 4. Finally, the folding rule described has the advantage that the intended

ίο Hinge and Einrastelcmente on the limb printed scales along the link edges interrupt.

An unfilled!

thermoplastic plastic is used If the modulus of elasticity of such a Kunststof fes is not sufficiently large, a glass fiber ver stronger thermoplastic, e.g. B. a fiberglass reinforced! Polyamide are used, which has an EIa

ao modulus of elasticity of about 60,000 to over 120,000 kg, mm ² .

1 sheet of drawings

Claims (1)

¹ 2 663 940) to put a burden on one shoe ... h ^ n which was arranged concentrically to the rivet, _Claims : hen, which -m ^ ^^ success g _{le gmer} ^ HrinoimB of the other shoe in a corresponding L folding rule, consisting of several dnngung ' ^acs JJ _{in the wood of the other} pair at their ends by a continuous axially resilient "^", "n _jm JI ₀ J ₂ hon _sc after a short time so vergehaltenen bolt and connected in minde- ^ ⁰ £ j _{"that d} j _e inaccuracy scmissen a single least two layers of mutually engageable GUE w _h ^ _{zuliissi measure the connection current w,} possibly reinforced with inserts Plastic, whereby each link together with the «> ^aüS J ™ \ _also tries to (German patent Latching elements consists of one piece, that ..I ₀ T ₁₇ Tη a scale without use, characterized in that the one written L 221 Il J ^ _r he hinge pin Member (2) of a joint concen- cherish ends of shoes ^ £ ΞκορΓ or as a whole Spitrisch to the bore for the bolt (4) is formed with ^e ^. ^ _C ^ J _{kd end a} s a. I _m annular bead (9) which has a ^, ntspre- x ₅ ^ f ^^ Zn of questionable praktT-sponding annular groove (10) on the other member (3) a first case, Bt, ^ aog _{suspension so hard that the ge} . Bearing forms and the suspension of the bolt (4) svjen ^^ f '^ _Eerin Jn wear Lr by a groove (8) arranged in a groove (8) on the outside of the gla- wunscnte_ ^ ¹ ^ of (2) ^ SÜ according to claim 1. thereby ^^ characterized that the spring as in a transverse- hence are the two ^{Bolzens (4) reading spring} " S ^^ ^ ffiSÄ ^ ch claim ,, characterized * S 'S ^ ftschlüs.ge ■ ™ ^ * r GdJ-characterized that the groove (8) in which the pairs is only inadequate because the gluchgul ring bead (9) bearing member ( 2) is arranged. Whether bolt, spring or sleeve, these are in their Vcr-4 CliedermaßLb according to claims I to 3, the ratio between diameter and length so imperfectly characterized that the depressions (12) are constantly that an exact storage is impossible. the snap-in elements in which the ring groove (10) is located. visibly not in terms of dimensional accuracy ^{w b} _{After the} introduction of plastic to manuf The development of links for folding rules was believed to be done without springs and other resilient elements. 35 come because the plastic itself was resilient. Q: s but it quickly became apparent that such a construction would wear out within a very short time assumed such great values that such a yardstick The present invention relates to a limb that was not usable. It was therefore pre-measured consisting of several pairs of beats at their 4 ° (French additional patent specification 88 607), Ends by a through hole inserted in bores - especially with rulers made of aluminum, additional axially resiliently held bolts connect guide elements made of plastic for the beans and mutually recesses in at least two layers and can be partially pre-latched for the latching elements Joints made of if necessary with inserts, which are more resistant to wear and tear Plastic, each link together 45 ren. A special spring element was provided the locking elements consists of one piece. draws, assuming that the limbs are within