AT513382B1 - Clamping device for a lacing element - Google Patents

Abstract

Clamping device (6) for a lacing element (2), which is formed by a lace (4) for adapting an inlet opening (3) of a shoe (1), with a housing (7) for receiving the lacing element (2) and with clamping means for clamping the lacing element (4). 2) on the housing (7), the clamping means having two clamping legs (8) pivotable between a portion (5) of the lace (2) on the housing (7) clamping position and a releasing the sections (5) of the Schnürelements (2) release position are, wherein the clamping portions (10, 11) are formed such that the clamping device (6) in the clamping position in the one direction (12) along the lacing element (2) is displaceable and blocked against displacement in the opposite direction (13).

Description

9Amid & $ i $ che $ AT513 382B1 2014-04-15

Description: The invention relates to a clamping device for a lacing element, which is formed by a laces for adapting an inlet opening of a shoe, with a housing for receiving the lacing element and with clamping means for clamping the lacing element on the housing, wherein the clamping means comprise two clamping legs have, which are pivotable between a portion of the Schnürelements on the housing clamped clamping division and a release of the portions of the Schnürelements release position.

Furthermore, the invention relates to a consumer article, in particular shoe, bag, backpack, tent, garment, with such a clamping device.

From US 2011/067211 A1 a clamping device for lashing a shoe lace is known, this device can be used for example in snowboard boots. The clamping device has a housing through which the shoelaces are guided. The fixing of the laces is accomplished by two toothed clamping arms, which cooperate with corresponding clamping areas on the housing. To release the clamping, the clamping arms are mounted pivotably about a common axis.

Disadvantageously, however, it is necessary in this prior art, to pivot the clamping arms in the release position, before the laces could be lashed.

With the US 349.032 A, US 2,315,196 A and US 2012/180267 A1 also clamping devices in other fields of technology have become known.

From EP 1 495 691 B1 a locking device for a shoe lace is known, which has a freely rotatable, circular blocking element. The circular blocking element has a toothing, with which the shoelace is clamped against the inner wall of the blocking device. The blocking element is in this case displaceable by means of a release element in a clamping position.

EP 0 629 793 B1 discloses a further blocking device with a round, freely rotatable and displaceable blocking element, which is displaceable by means of a pusher between the release and the clamping position.

In these blocking devices, therefore, the laces are held by a common, central clamping member in the clamping position. Disadvantageously, therefore, the clamping of the two laces is interdependent. Thus, by insufficient clamping of a shoe lace and the clamping of the other shoe lace can be affected. As a result, the prior art has proven to be less reliable in use.

The gear also disadvantageously requires a chunky construction. Furthermore, it is disadvantageous in the prior art that the function of the blocking device can be lost even by slight variations in the thickness of the laces; For use with different shoelaces therefore complicated adjustments of the blocking device are required.

Accordingly, the object of the present invention is to provide a clamping devices of the type mentioned, with which the clamping of the lacing element is designed particularly reliable, so that accidental release of the clamping device in the clamping position is largely avoided. In addition, the invention aims to reduce the size of the clamping device. Finally, the clamping device should be usable with various lacing elements.

According to the clamping portions are formed such that the clamping device is displaceable in the clamping position in the one direction along the Schnürelements displaceable and against displacement in the opposite direction. Accordingly, the clamping of the two sections of the lacing element is effected by a pair of clamping legs, which in the clamping position press the sections of the lacing element against the housing. Advantageously, therefore, the sections of the Schnürelements each associated with its own clamping leg, whereby a particularly reliable clamping is achieved. To release the lacing element, the clamping legs are pivotable away from the housing, so that the sections of the lacing element in the release position can slide freely through the housing. With the help of the clamping legs, the Schnürele-element, which may be attached to various commodities, but preferably on a shoe, held in the set position. In the case of a shoe, in particular the width of a manhole can be determined hereby. The clamping legs can advantageously be made particularly compact, whereby the size of the clamping device can be reduced. Another advantage of the embodiment according to the invention is that, with the aid of the clamping legs, depending on the pivot angle, lacing elements with different thicknesses can be used without having to adjust the clamping device for this purpose. For tying a provided with the clamping device utility article is provided that the clamping regions are formed such that the clamping device is displaceable in the clamping position in one direction along the lacing element and against displacement in the opposite direction. Accordingly, the clamping device can be pushed manually in the direction released for a displacement, whereby the lacing element is made narrower. Due to the blocking in the opposite direction, the clamping device then automatically remains in the position set by the user.

In order to prevent the clamping of a portion of the Schnürelements impairs the clamping of the other portion of the Schnürelements, it is advantageous if the clamping legs are mounted independently pivotable. Advantageously, therefore, the pivot angle of the clamping legs can differ from each other.

To achieve a part-saving design, it is advantageous if the clamping legs are mounted on a common pivot axis.

If the common pivot axis is formed integrally with one of the clamping legs, the production of the clamping means can be advantageously made particularly simple and inexpensive. To achieve the one-piece design of the clamping leg and the pivot axis may be made by injection molding of a plastic material. Alternatively, the pivot axis may be formed by a separate pin.

According to a particularly preferred embodiment, the clamping legs are designed cranked, wherein the free ends of the clamping legs lie substantially in the same plane. Advantageously, therefore, the clamping legs are not loaded in the axial direction when the clamping legs are actuated to release the lacing element. Thus, advantageously, the wear of the clamping means can be kept low, whereby a particularly durable design is achieved.

In order to prevent damage to the clamping legs, it is advantageous if the clamping legs have the pivoting of the clamping legs in the release position limiting stops.

For fixing the Schnürelements in the clamping position, it is advantageous if the clamping legs have at the free ends clamping areas, which cooperate with corresponding clamping areas on the housing. The clamping areas are in this case preferably formed on the outer end faces plate-shaped clamping legs.

The clamping of the lacing element is preferably achieved in that the clamping regions have clamping teeth, which are preferably arranged in the clamping position at an acute angle to the longitudinal axis of the lacing element. Due to the asymmetrical design of the clamping teeth, it can be ensured in a simple manner that the clamping device in the clamping position is only displaceable in one direction, but blocked in the other direction of rotation.

To achieve high clamping forces, it is advantageous if the clamping regions of the clamping legs and / or the clamping regions of the housing are made of metal. Alternatively, clamping regions made of plastic are provided, wherein the clamping legs are preferably obtained by injection molding.

Preferably, metal inserts and / or for forming the clamping regions of the housing metal inserts are provided to form the clamping regions of the clamping legs, wherein the metal inserts, preferably via an injection-molded connection, are connected to plastic parts of the clamping legs and the housing. Accordingly, the clamping regions of metal can be provided directly in the production of clamping legs or the housing by injection molding.

In order to load the clamping device in the direction of the clamping position, it is advantageous if a spring element is arranged between the housing and the clamping legs, wherein the clamping legs are pivotable against the action of the spring element from the clamping position to the release position. Accordingly, the clamping legs are arranged in the normal state in the clamping position. To release the Schnürelements the clamping legs are pivoted against the force of the spring element from the clamping position.

In view of a durable, structurally simple design, it is advantageous if the spring element is designed as a leg spring with pressing against the clamping legs thighs. Accordingly, the clamping legs are biased by the leg spring in the direction of the clamping position. The legs of the leg spring are individually elastically deformable, so that the sections of the lacing element can be clamped independently of one another by the clamping legs. Alternatively, each clamping leg can interact with its own spring element.

To bias the two clamping legs using a single leg spring in the direction of the clamping position, it is advantageous if the leg spring is mounted between the clamping legs on the common pivot axis. The leg spring is preferably held on the pivot axis via a winding section of the leg spring connecting the legs.

To release the Schnürelements an actuating element for pivoting the clamping legs between the clamping position and the release position is preferably provided. By pressing the clamping legs, the lacing element is released and at the same time the clamping device is moved along the lacing element. Advantageously, thus the consumer article can be freed from the lace position with a single handle.

For simultaneous operation of the two clamping legs, it is advantageous if each clamping leg has a mounting opening for the actuating element. Advantageously, hereby the one-handed operation of the clamping device can be substantially facilitated.

According to a preferred embodiment Einhakelemente are provided on the actuating element, which are releasably, in particular by means of a snap connection, are fixable in the mounting holes of the clamping legs. This has the advantage that the actuator can be easily changed in the event of damage.

With regard to a flexible handling of the clamping device, it is advantageous if a longitudinally tensionable and perpendicular to the longitudinal direction substantially freely deformable actuating element, in particular a textile longitudinal element, preferably a cord, is provided, which is preferably connected to a separate grip part , In this case, a torque is applied to the clamping legs by applying a tensile force on the actuating element, which causes the pivoting of the clamping legs in the release position.

If, as an actuating element, as preferred, a textile longitudinal element, in particular 3/16

"Put" "pitwiaist AT513 382 B1 2014-04-15 provided, the textile longitudinal element may have associated with the attachment openings sections, which in turn are interconnected.

The handling of the clamping device can also be improved if the actuating element is connected to a handle part. This embodiment is particularly advantageous if the actuating element is provided as a textile longitudinal element, which as such can be difficult to grasp by a user wearing a glove.

In this embodiment, it is also advantageous if the clamping legs are formed by injection molded parts, which is connected via an injection-molded connection with the freely deformable actuating element. Thus, the attachment of the actuating element in the manufacture of the clamping legs can be carried out by injection molding.

According to an alternative preferred embodiment, an elastically deformable bracket element is provided as the actuating element, which is preferably connected in one piece with the clamping legs. Preferably, the clamping legs and the bracket member are formed by an injection molded part. This embodiment has the particular advantage that due to the elastic deformation of the bracket element, a restoring force is achieved, which presses the clamping legs in the direction of the clamping legs. Thus, in this embodiment can be dispensed with a separate spring element, creating a particularly simple, inexpensive design is created.

Depending on the design, the housing may preferably have a rounded clamping surface for clamping a round lacing element or a flat clamping surface for clamping a flat lacing element.

However, it is particularly preferred if the housing has a flat clamping surface and thereof protruding at an inclination angle clamping flanks, so that the clamping device can be used both with a round lacing element as well as with a flat lacing element. Preferably, the angle of inclination between substantially 30 ° - 60 °, in particular substantially 45 °.

The invention will be explained below with reference to preferred embodiments illustrated in the drawings, to which, however, it should not be limited. In detail, in the drawing: Fig. 1 Fig. 3 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 6 [0042] Fig. 7 [Fig. Fig. 8 is a perspective view of a shoe with a clamping device according to the invention, which has a pair of pivotable clamping legs for clamping the laces; a perspective view of the individual parts of the clamping device of FIG. 1; a sectional view of the clamping device of Figure 1, 2, wherein the clamping legs are arranged in the clamping position. a sectional view of the clamping device according to Figures 1 to 3, wherein the clamping legs are arranged in the release position. and a plan view of the clamping device of Figures 1 to 4. a view of an embodiment of the clamping device, wherein the clamping legs are pivotable by means of an actuating element in the release position; a view of another embodiment of the clamping device for use with a flat shoe lace; a view of another embodiment of the clamping device, which is equally suitable for use with a flat as well as a round lacing element; 4/16

Fig. 9a Fig. 9b Figs. 11, 12 Fig. 13, 14 AT513 382B1 2014-04-15 a view of a further embodiment of the clamping device, in which an actuating element is injected by injection molding in the clamping legs; a section along the line IXb-IXb in Fig. 9a; a view of another embodiment of the clamping device, wherein the actuating element Einhakelemente for releasable connection with the clamping legs;

Views of a further embodiment of the clamping device, in which clamping areas are provided of metal; and

Views of a further embodiment of the clamping device, wherein the clamping legs 8 are connected to each other via an elastically deformable bracket element.

Fig. 1 shows a shoe 1, especially a cross-country boot, which has a lacing element 2 for adapting an inlet opening 3 of the shoe 1. The lacing element 2 is formed by a lace 4, which has two sections 5 running in the instep or shaft region of the shoe 1. The sections 5 of the lace 4 are guided by a clamping device 6, with which the width of the inlet opening 3 is set or fixed.

As further apparent from FIGS. 2 to 5, the clamping device 6 has a housing 7 for receiving the sections 5 of the lace 4. The clamping device 6 has clamping means for clamping the shoelace 4 within the housing 7. In the embodiment shown, the clamping means on a pair of clamping legs 8, which are mounted on a common pivot axis 9. The clamping legs 8 are in this case between a clamping position shown in FIG. 3, in which both sections 5 of the lace 4 are clamped to the inner wall of the housing 7, and a release position in which the sections 5 of the lace 4 can slide freely through the housing 7 , swiveling.

As further apparent from FIGS. 2 to 5, the clamping legs 8 have the same pivot axis 9, the clamping legs 8 being mounted on the pivot axis 9 independently of one another. Accordingly, the pivoting angles of the clamping legs 8 may differ from each other, so that differences in the thickness of the sections of the lacing element 2 can be compensated. Advantageously, moreover, the clamping of one section 5 of the lace 4 is not impaired by the clamping of the other section 5 of the lace 4.

As further apparent from FIGS. 2 to 5, the clamping legs 8 have at their free ends clamping areas 10, which cooperate in the clamping position with corresponding (not shown in FIG. 2) clamping areas 11 on the inner wall of the housing 7 to to lock the shoelace 4 in the desired position. The configuration of the clamping regions 10, 11 of the clamping legs 8 and the housing 7 causes the clamping device 6 in the clamping position in one direction 13 along the Schnürelements 2 slidably, but is blocked against displacement in the opposite direction 12. For this purpose, the clamping regions 10, 11 obliquely to the longitudinal axis of the Schnürelements 2 Asked clamping teeth, which release the Schnürelement 2 for manual displacement of the clamping device 6 in the direction 13, but block against displacement in the direction 12. The displacement of the clamping device 6 in the direction 13 causes in the embodiment shown a reduction of the released by the laces 4 width of the inlet opening 3. Accordingly, the clamping device 6 can be moved as needed by the user in the direction 13 to the width of the inlet opening 3 of the shoe first to reduce. Due to the clamping action in direction 12, the clamping device 6 is reliably held in the position set by the user.

In the embodiment according to FIGS. 1 to 5, a cross-sectionally round, in particular circular, lacing element 2 is provided, which is clamped against a correspondingly rounded clamping surface 11 on the inner wall of the housing 7. As can also be seen from FIGS. 2 to 5, between the housing 7 and the clamping legs 8 a spring element 15 is arranged, which clamps the clamping legs 8 in the direction of the clamping position suppressed. To release the lace 4, therefore, the clamping legs 8 are wasted against the force of the spring element 15 from the clamping position to the release position. In the embodiment shown, a leg spring 16 is provided as spring element 15, which has two legs 18 extending from a turn section 17. The leg spring 16 is mounted between the clamping legs 8 on the common pivot axis 9. The legs 18 of the leg spring 16 are biased against the clamping legs 8, so that the clamping device 6 is arranged in the normal state in the clamping position.

As further apparent from FIGS. 2 to 5, the pivot axis 9 is formed in one piece with one of the clamping legs 8. The pivot axis 9 in this case consists of a protruding from one side of the clamping leg 8 longer section 9 'and from a protruding from the other side of the clamping leg 8 shorter section 9 ". The sections 9 ', 9 " the pivot axis 9 are held in opposite openings 7 'of the housing 7. The longer portion 9 'of the pivot axis 9 serves to support the leg spring 16 and the other clamping leg. 8

The one-piece design of pivot axis 9 and clamping leg 8 is preferably achieved by an injection molded part. Alternatively, the pivot axis 9 may be present separately from the clamping parts 8, for example in the form of a rivet or pin (not shown).

2 and 5, the clamping legs 8 are designed cranked, wherein the free ends of the clamping legs 8 are arranged substantially in the same plane 8 '(see FIG. When applying a tensile force on the clamping legs 8 thus occur advantageously no forces perpendicular to the plane 8 ', whereby the clamping device 6 is spared.

As further apparent from FIGS. 2 to 5, the clamping legs 8 each have a stop 19 with which the pivoting of the clamping legs 8 is limited. Upon reaching a predetermined pivot angle, the stops 19 abut a bottom of the housing 7, whereby a further pivoting of the clamping legs 8 is blocked (see Fig. 4). The stops 19 are formed in the embodiment shown by nose-shaped projections on the underside of the clamping legs 8.

As can be seen from Fig. 6, the clamping device 6 also has an actuating element 20, with which the clamping legs 8 between the clamping position and the release position can be transferred. In the embodiment shown, 20 longitudinal textile elements 21 are provided as the actuating element, which are connected to each other in the manner of a cord. The actuating element 20 is fastened via fastening openings 22 at the free ends of the clamping legs 8. The actuator 20 also has a handle portion 23 which the user can grasp and pull in the direction 13 to release the clamping of the lace 4.

Fig. 7 shows a further embodiment of the clamping device 6 for use with a flat Schnürelement 2 ', which is designed in the embodiment shown as a flat band. In this embodiment, the housing 7 has a flat clamping surface 7 ', on which a flat contact surface of the flat Schnürelements 2' over the entire surface can be applied. By this measure, a significantly better clamping effect when using flat strips, since a twisting of the sections 5 of the Schnürelementes 2 'is reliably prevented by improper handling.

Fig. 8 shows a particularly advantageous embodiment of the housing 7 for use with both a flat 2 'and with a round lacing element 2. For comparison purposes, both types of lacing elements 2, 2' are shown in Fig. 8. Of course, in practice, however, either a round or a flat lacing element 2 is used. The variable use of the clamping device 6 with round or flat Schnürelemen- 6/16 ρ®ίκηΕδίϊϊί AT513 382 B1 2014-04-15 th 2, 2 'is achieved in that the housing 7 to the flat clamping surface 7 subsequent clamping flanks 7 " has, which are arranged in the embodiment shown at an angle of inclination of substantially 45 ° to the flat clamping surface 7. The clamping flanks 7 " are just executed in the embodiment shown.

Fig. 9a shows a particularly advantageous embodiment for fixing the longitudinal elements 21 of the actuating element 20 to the clamping legs 8. In this embodiment, as can be seen from the section IXb-IXb in Fig. 9b, the longitudinal elements 21 in the injection molding process directly injected into the clamping legs 8. This has the advantage that in the production of the clamping legs 8 in the injection molding no elaborate injection molding tool is necessary because no mounting holes (see Fig .. 1 to 5) must be realized.

10 shows an alternative embodiment of the actuating element 20, wherein in this case hooking elements 21 'are provided on the longitudinal elements 21, which can be inserted into the fastening openings 22 of the clamping legs 8 (see arrows 21 ") and in the manner of a snap connection can be fixed.

In the embodiments shown, the clamping legs 8 and the housing 7 of the clamping device 6 are made of plastic, wherein preferably a plastic from the class of polyamides or the class of polyacetals is used. However, the manufacture of the clamping device 6 is by no means limited to these plastic families. In the production of the parts made of plastic, the injection molding method is preferably used in order to ensure economical production of the clamping device 6 shown.

Fig. 11 and Fig. 12 show an alternative embodiment, which is particularly advantageous if the clamping device 6 shown should be used for the use of very stiff Schnü-elements 2, for example, when used for a tent. In this case, the clamping regions 10 of the clamping legs 8 and / or the clamping regions 11 of the housing 7 are made of metal, for example of aluminum or steel. Advantageously, a substantially higher clamping force can be applied to the lacing elements 2 without the teeth being worn down. In the embodiment shown, the clamping regions 10 of the clamping legs 8 are formed by metal inserts 10 'and the clamping regions 11 of the housing 7 by metal inserts 11'. This makes a simple and cost-effective design of the clamping regions 10, 11 made of metal possible. In production, the metal inserts 10 'and 1T are inserted into the injection mold and sprayed during injection of the housing 7 and the clamping leg 8 with plastic, whereby an intimate connection is made.

Fig. 13, 14 show a particularly easy to manufacture clamping device, which is shown in FIG. 13 in the clamping position and in FIG. 14 in the open position. In this embodiment, the clamping legs 8 are connected to each other via an elastically deformable bracket member 24. The two clamping legs 8 are, as mentioned, pivotable about a pivot axis 9. In the open position according to Fig. 14, the bracket element 24 is in the elastically deformed state, so that a tension in the direction of the clamping position (see, the arrows 25) is constructed. In the clamping position according to FIG. 13, the stirrup element 24 presses the clamping legs 8 against the housing 7, so that the sections 5 of the lacing element 2 are fixed. By this measure, the installation of a leg spring 16 can be avoided, which leads in particular in a production of the clamping device 6 by injection molding to a very economical production. 7/16

Claims (22)

A clamping device (6) for a lacing element (2), which is formed by a lace (4) for adapting an inlet opening (3) of a shoe (1) to a housing (10). 7) for receiving the lacing element (2) and with clamping means for clamping the Schnü-relements (2) on the housing (7), wherein the clamping means comprise two clamping legs (8) which between a portions (5) of the lacing element (2) on Housing (7) clamped clamping position and the sections (5) of the Schnürelements (2) releasing release position are pivotable, characterized in that the clamping regions (10, 11) are formed such that the clamping device (6) in the clamping position in the one Direction (12) along the lacing element (2) is displaceable and blocked against displacement in the opposite direction (13). 2. Clamping device (6) according to claim 1, characterized in that the clamping legs (8) are mounted pivotably independently of one another. 3. Clamping device (6) according to claim 1 or 2, characterized in that the clamping legs (8) are mounted on a common pivot axis (9). 4. Clamping device (6) according to claim 3, characterized in that the common pivot axis (9) is formed integrally with one of the clamping legs (8). 5. Clamping device (6) according to one of claims 1 to 4, characterized in that the clamping legs (8) are designed cranked, wherein the free ends of the clamping legs (8) are located substantially in the same plane (8 '). 6. Clamping device (6) according to one of claims 1 to 5, characterized in that the clamping legs (8), the pivoting of the clamping legs (8) in the release position limiting stops (19). 7. Clamping device according to one of claims 1 to 6, characterized in that the clamping legs (8) at the free ends clamping regions (10) which cooperate with corresponding clamping regions (11) on the housing. 8. Clamping device according to one of claims 1 to 7, characterized in that the clamping regions (10, 11) clamping teeth (14), which are preferably arranged in the clamping position at an acute angle to the longitudinal axis of the lacing element (2). 9. Clamping device according to one of claims 1 to 8, characterized in that the clamping regions (10) of the clamping legs (8) and / or the clamping regions (11) of the housing (7) are made of metal. 10. Clamping device according to claim 9, characterized in that for forming the clamping regions (10) of the clamping legs (8) metal inserts (10 ') and / or for forming the clamping regions (11) of the housing (7) metal inserts (11') are provided , wherein the metal inserts (10 ', 11'), preferably via an injection-molded connection, are connected to plastic parts of the clamping legs (8) or of the housing (7). 11. Clamping device according to one of claims 1 to 10, characterized in that between the housing (7) and the clamping legs (8) a spring element (15) is arranged, wherein the clamping legs (8) against the action of the spring element (15) of the clamping position are pivotable in the release position. 12. Clamping device according to claim 11, characterized in that the spring element (15) as a leg spring (16) against the clamping legs (6) pressing legs (18) is formed. 13. Clamping device according to claim 12, characterized in that the leg spring (16) is mounted between the clamping legs (8) on the common pivot axis (9). 8.16 8th B? Iä »5c !!« s Patent Office AT513 382 B1 2014-04-15 14. Clamping device according to one of claims 1 to 13, characterized in that an actuating element (20) for pivoting the clamping legs (8) is provided between the clamping position and the release position. 15. Clamping device according to claim 14, characterized in that each clamping leg (8) has a fastening opening (22) for the actuating element (20). 16. Clamping device according to claim 15, characterized in that on the actuating element (20) Einhakelemente (21 ') are provided, which are releasably, in particular by means of a snap connection, in the mounting holes (22) of the clamping legs (8) can be fixed. 17. Clamping device according to one of claims 14 to 16, characterized in that a longitudinally tensionable and perpendicular to the longitudinal direction substantially freely deformable actuating element (20), in particular a textile longitudinal element (21), preferably a cord, is provided, which preferably with a separate handle part (23) is connected. 18. Clamping device according to claim 17, characterized in that the clamping legs (8) are formed by injection molded parts, which is connected via an injection-molded connection with the freely deformable actuating element (20). 19. Clamping device according to claim 14, characterized in that as the actuating element (10) an elastically deformable bracket element (24) is provided, which is preferably integrally connected to the clamping legs (8). 20. Clamping device according to one of claims 1 to 19, characterized in that the housing (7) has a rounded clamping surface for clamping a round Schnü-relements (2) or a flat clamping surface (7 ') for clamping a flat Schnü-relements (2 ') having. 21. Clamping device according to claim 20, characterized in that the housing (7) has a flat clamping surface (7 ') and thereof protruding at an angle of inclination clamping flanks (7 "). 22. Shoe with a clamping device (6) according to one of claims 1 to 21. For this 7-sheet drawings 9/16