Multi-mode wrench

Description

BACKGROUND OF INVENTION

1. FIELD OF INVENTION

[0001] The present invention relates to a one-way wrench and, more particularly, to a multi-mode one-way wrench according to the preamble of claim 1.

[0002] Such a wrench is known from GB 2 197 609 A.

2. RELATED PRIOR ART

[0003] A one-way wrench (or "ratchet wrench") includes a head, a toothed wheel placed in the head, and a pawl placed in the head. The head can be rotated in an active direction to bring the pawl into engagement with the toothed wheel so that the head rotates the toothed wheel via the pawl. The head can be rotated in an idle direction to allow the pawl to rattle on the toothed wheel so that the head does not rotate the toothed wheel in the idle direction.

[0004] In operation, the toothed wheel is engaged with a nut for example. The head is rotated in the active direction to rotate the toothed wheel for an angle, and the head is rotated in the idle direction for an adequate angle before the head is rotated in the active direction again to rotate the wheel. This process is repeated so that the nut is engaged with a screw or removed from a screw. Such a one-way wrench is particularly useful in a limited space.

[0005] The head must be rotated in the idle direction for at least a minimum angle before the head can rotate the toothed wheel in the active direction again. The more the teeth of the toothed wheel are, the smaller the minimum angle is, i.e., the more convenient the operation of the one-way wrench is. For example, the minimum angle is 10° where the toothed wheel includes 36 teeth but only 5° where the toothed wheel includes 72 teeth. However, the more the teeth are, the smaller and hence weaker they are. It is difficult to increase the convenience without jeopardizing the strength in a conventional one-way wrench.

[0006] To reach a good balance between the convenience and strength, the applicant has invented a one-way wrench and filed applications such as European Patent Application No. 12195169.3, U. S. Patent Application No. 13/691,477, Japanese Patent Application No. 2013-170474, Chinese Patent Application No. 201210507001.6 and Taiwanese Patent Application No. 101139643.

[0007] Therefore, the present invention is intended to obviate or at least alleviate the problems encountered in prior art.

SUMMARY OF INVENTION

[0008] It is the primary objective of the present invention to provide a multi-mode one-way wrench.

[0009] To achieve the foregoing objective, there is provided a multi-mode one-way wrench according to claim 1 that includes a head, a toothed wheel, a leading pawl, at least one following pawl and a switch. The head includes cutouts in communication with a chamber. The toothed wheel rests in the chamber and includes teeth. The pawls are movably rest in the cutouts and adapted for alternate engagement with the toothed wheel. The following pawl includes a stem. The switch rests on the head and made with at least one arched groove for receiving and guiding the stem to move the following pawl between a first mode for engagement with the toothed wheel and a second mode kept from the toothed wheel. The cutouts are biased from one another by an angle of 360°×(M+1/L)÷N, wherein L is an integer for representing the number of the cutouts, M is any proper integer, and N is an integer for representing the number of the teeth.

[0010] Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.

BRIEF DESCRIPTION OF DRAWINGS

[0011] The present invention will be described via detailed illustration of the preferred embodiment referring to the drawings wherein:

FIG. 1 is a perspective view of a convenient and strong multi-mode one-way wrench according to the preferred embodiment of the present invention;

FIG. 2 is an exploded view of the multi-mode one-way wrench shown in FIG. 1;

FIG. 3 is a top view of the multi-mode one-way wrench shown in FIG. 1, with a cover removed;

FIG. 4 is a cross-sectional view of the multi-mode one-way wrench shown in FIG. 1;

FIG. 5 is a top view of the multi-mode one-way wrench shown in FIG. 1;

FIG 6 is a top view of the multi-mode one-way wrench shown in FIG. 5, with the cover removed; and

FIG. 7 is a top view of the multi-mode one-way wrench in another position than shown in shown in FIG. 5; and

FIG. 8 is a top view of the multi-mode one-way wrench shown in FIG. 7, with the cover removed.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

[0012] Referring to FIGS. 1 and 2, a multi-mode one-way wrench 10 includes a head 11, a handle 12, a toothed wheel 30, two pawl units 40 and 50, a cover 61 and a switch 70 according to the preferred embodiment of the present invention. The head 11 is formed at an end of the handle 12. It should be noted that there is no clear borderline between the head 11 and the handle 12 since they are made one. The head 11 includes a wall 13 extending on a planar face 19 and extending around a shallow cavity 15.

[0013] The head 11 further includes a circular chamber 16 made in the planar face 19, a circular opening 17 made in an annular flange 18 extending from the wall of the circular chamber 16, and a bore 14 made in the planar face 19. The shallow cavity 15, the circular chamber 16 and the circular aperture are in communication with one another.

[0014] The head 11 further includes two cutouts 20 each formed with an opening 21, an arched face 22, a vertical planar face 23, a sub-cutout 24, a floor 25 and a bore 26. The opening 21 is made between arched face 22 and the vertical planar face 23. Each cutout 20 is in communication with the circular chamber 16 via the opening 21. Both of the arched face 22 and the vertical planar face 23 extend on the floor 25. The sub-cutout 24 is made between the arched face 22 and the planar face 23. The bore 26 is made in the floor 25. For clarity, one of the cutouts 20 will be referred to as the "first cutout 20" and the other cutout 20 the "second cutout 20" in the following description.

[0015] The toothed wheel 30 is formed with two axles 33, teeth 31 and a non-circular aperture 32. One of the axles 33 (the "lower axle") extends from a lower side of the toothed wheel 30 while the other axle 33 (the "upper axle") extends from an upper side of the toothed wheel 30. The teeth 31 extend from the periphery of a middle portion of the toothed wheel 30 in a radial manner. The non-circular aperture 32 axially extends throughout the toothed wheel 30 including the axle 33. The non-circular aperture 32 can receive a nut or a head of a threaded bolt in use.

[0016] In another embodiment, the non-circular aperture 32 can be replaced with a non-circular insert for insertion in a corresponding bore made in a tool bit (not shown) that in turn can receive a nut or a head of a threaded bolt in use.

[0017] The second cutout 20 is biased from the first cutout 20 by an angle θ regulated by the following equation:

wherein N is an integer that represents the number of the teeth 31 and M is any proper integer.

[0018] In the preferred embodiment, there are thirty-six (36) identical teeth 31. Hence, each tooth 31 covers 10°. The angle θ between the first and second cutouts 20 is 35° for example.

[0019] The pawl unit 40 includes a pawl 41 and a spring 45. The pawl 41 includes a key 43 extending, in a radial direction, from an axle 42 made with a reduced end 44.

[0020] The pawl unit 50 includes a pawl 51 and a spring 55. The pawl 51 includes a key 53 extending, in a radial direction, from an axle 52 made with a reduced end 54. The pawl 51 is identical to the pawl 41 except for including an additional stem 56 extending upwards from the key 53.

[0021] The cover 61 is made with a circular opening 62 and two apertures 63 and 64. The cover 61 is made in compliance with the shallow cavity 15.

[0022] The switch 70 is a flat element. The switch 70 includes a circular opening 71, an arched groove 72, two recesses 73 made in a lower face, and a ridge 74 formed on an upper face.

[0023] The toothed wheel 30 is placed in the circular chamber 16. The middle portion of the toothed wheel 30, on and around which the teeth 31 are formed, is supported on the annular flange 18. The lower axle 33 extends out of the head 11 through the circular opening 17. The annular flange 18 is used as a bearing for the lower axle 33. The upper axle 33 extends out of the head 11 through the shallow cavity 15.

[0024] The pawl 41 and the spring 45 are placed in the first cutout 20. The axle 42 is inserted in the sub-cutout 24 of the first cutout 20. The reduced lower end 44 is inserted in the bore 26 of the first cutout 20 so that the pawl 41 is allowed to pivot. The spring 45 is compressed between the key 43 and the arched wall 22 of the first cutout 20. Thus, the spring 45 tends to push the key 43 into engagement with at least one of the teeth 31, out of the opening 21 of the first cutout 20.

[0025] The pawl 51 and the spring 55 are placed in the second cutout 20. The axle 52 is inserted in the sub-cutout 24 of the second cutout 20. The reduced lower end 54 is inserted in the bore 26 of the second cutout 20 so that the pawl 51 is allowed to pivot. The spring 55 is compressed between the key 53 and the arched wall 22 of the second cutout 20. Thus, the spring 55 tends to push the key 53 into engagement with at least one of the teeth 31, out of the opening 21 of the second cutout 20. The stem 56 extends out of the second cutout 20.

[0026] A spring 60 and a ball 65 are placed in the bore 14. The spring 60 is compressed between the ball 65 and a closed end of the bore 14. Thus, the spring 60 tends to push the ball 65 out of an open end of the bore 14.

[0027] The cover 61 is supported on the head 11. The cover 61 is placed in the shallow cavity 15 and confined by the wall 13. The circular opening 62 is aligned with the circular chamber 16 to allow the upper axle 33 to extend beyond the cover 61 via the circular opening 62. The cover 61 is used as a bearing for the upper axle 33. The aperture 63 is aligned with the second cutout 20 to allow the stem 56 to extend beyond the cover 61 via the aperture 63. The aperture 63 is made of a diameter larger than that of the stem 56 to allow the stem 56 to move in the aperture 63. The aperture 64 is aligned with the bore 14 to allow the ball 65 to extend beyond the cover 61 via the aperture 64.

[0028] The switch 70 is placed on the cover 61. The circular opening 71 is aligned with the circular opening 62 to allow the upper axle 33 to extend beyond the switch 70 through the circular opening 71. One of the recesses 73 receives the ball 65. The arched groove 72 receives the tip of the stem 56.

[0029] A C-clip 34 is engaged with the upper axle 33. Another C-clip 35 is engaged with the lower axle 33. Thus, all of the elements are kept in position.

[0030] Referring to FIGS. 5 and 6, the multi-mode one-way wrench 10 is placed in a half-tooth mode as the switch 70 is placed in a first position. One of the recesses 73 receives the ball 65 to keep the switch 70 in the first position and the multi-mode one-way wrench 10 in the half-tooth mode in an elastic manner.

[0031] In the half-tooth mode, the key 53 of the pawl 51 is allowed to pivot while the stem 56 is allowed to move in the arched groove 72. Hence, the key 53 of the pawl 51 is allowed to engage with and disengage from the teeth 31.

[0032] The key 43 of the pawl 41 is in contact with a tail side of a tooth 31. The head 11 and the handle 12 are pivoted counterclockwise. The head 11 rotates the toothed wheel 30 since the head 11 pushes the pawl 41 and the pawl 41 pushes the tooth 31. The key 53 of the pawl 51 is in contact with a leading side of another tooth 31.

[0033] Then, the handle 12 can be pivoted clockwise. Thus, the key 43 of the pawl 41 slides on the leading side of a tooth 31 while the key 53 of the pawl 51 slides on the leading side of another tooth 31.

[0034] After the head 11 is pivoted clockwise for as small as half of the angle θ of one tooth 31, i.e., 5°, the head 11 can be pivoted counterclockwise again to bring the key 53 of the pawl 51 into contact with the tail side of a tooth 31. Thus, the head 11 can rotate the toothed wheel 30.

[0035] The above-mentioned process can be repeated to bring the key 43 of the pawl 41 back into contact with the tail side of a tooth 31 and return the key 53 of the pawl 51 into contact with the leading side of another tooth 31. That is, the pawls 41 and 51 are alternately used to rotate the toothed wheel 30. The idle stroke, i.e., the clockwise rotation of the head 11 can be as small as half of the angle θ of one tooth 31, i.e., 5°.

[0036] Referring to FIGS. 7 and 8, the multi-mode one-way wrench 10 is placed in a one-tooth mode as the switch 70 is placed in a second position. The other recess 73 receives the ball 65 to retain the switch 70 in the second position and the multi-mode one-way wrench 10 in the one-tooth mode in an elastic manner.

[0037] In the one-tooth mode, the key 53 of the pawl 51 is prevented from contacting any tooth 31 since the stem 56 is restrained by the arched groove 72. Only the key 43 of the pawl 41 is allowed to contact the teeth 31. The key 43 of the pawl 41 is in contact with the tail side of a tooth 31. The head 11 can be pivoted clockwise to rotate the toothed wheel 30 because the head 11 pushes the pawl 41 and the key 43 of the pawl 41 pushes the tail side of the tooth 31.

[0038] Then, the handle 12 can be pivoted clockwise. Thus, the key 43 of the pawl 41 slides on the leading side of a tooth 31 while the key 53 of the pawl 51 slides on the leading side of another tooth 31.

[0039] After the head 11 is pivoted clockwise for as small as the angle θ of one tooth 31, i.e., 10°, the head 11 can be pivoted counterclockwise again to bring the key 43 of the pawl 41 back into contact with the tail side of a tooth 31. Thus, the head 11 can rotate the toothed wheel 30.

[0040] The present invention has been described via the detailed illustration of the preferred embodiment. Those skilled in the art can derive variations from the preferred embodiment without departing from the scope of the present invention. Therefore, the preferred embodiment shall not limit the scope of the present invention defined in the claims.

Claims

1. A multi-mode one-way wrench including:

a head (11) made with a chamber (16) and cutouts (20) in communication with the chamber;

a toothed wheel (30) rotationally placed in the chamber (16) and formed with teeth (31); and pawls (41,51) for alternate engagement with the toothed wheel and each pivotally placed in a corresponding one of the cutouts (20), wherein the pawls include a leading pawl (41) and at least one following pawl (51),

characterized in that the following pawl (51) is formed with a stem (56); and a switch (70) placed on the head (11) and made with at least one arched groove (72) for receiving and guiding the stem (56) to move the following pawl (51) between a first mode for engagement with the toothed wheel (30) and a second mode kept from the toothed wheel (30), wherein the cutouts (20) are biased from one another by an angle of 360°×(M+1/L)÷N, wherein L is an integer for representing the number of the cutouts (20), M is any proper integer, and N is an integer for representing the number of the teeth (31).

2. The multi-mode one-way wrench according to claim 1, wherein the stem (56) is movable along the arched groove (72) when the following pawl (51) rattles on the teeth (31) of the toothed wheel (30) in the second mode.

3. The multi-mode one-way wrench according to claim 1, including springs (45,55) each placed in a corresponding one of the cutouts (20) to bias the corresponding pawl (41,51) toward the toothed wheel (30).

4. The multi-mode one-way wrench according to claim 1, wherein each of the cutouts (20) includes a sub-cutout (24) made in a wall thereof, wherein each of the pawls (41,51) includes an axle (42,52) inserted in the sub-cutout (24) of the corresponding cutout (20).

5. The multi-mode one-way wrench according to claim 4, wherein each of the cutouts (20) includes a floor (25) and a bore (26) made in the floor, wherein the axle (42,52) of each of the pawls (41,51) includes a reduced end inserted in the bore (26) of the corresponding cutout (20).

6. The multi-mode one-way wrench according to claim 4, wherein each of the cutouts (20) includes a vertical face (23) extending next to the sub-cutout (24), wherein the vertical face (26) pushes a key (43) of the corresponding pawl which in turn pushes a tooth of the toothed wheel (30).

7. The multi-mode one-way wrench according to claim 4, wherein each of the pawls (41,51) includes a key (43,53) extending from the axle (42,52) in a radial direction, wherein the key (43,53) is adapted for engagement with the teeth (31) of the toothed wheel (30).

8. The multi-mode one-way wrench according to claim 7, wherein the stem (56) extends from the key (53) of the following pawl (51).

9. The multi-mode one-way wrench according to claim 1, wherein the switch (70) is pivotally connected to the head (11).

10. The multi-mode one-way wrench according to claim 1, including a cover (61) connected to the head (11) to keep the toothed wheel (30) in the head and the switch (70) on the head.

11. The multi-mode one-way wrench according to claim 10, wherein the cover (61) is placed between the head (11) and the switch (70).

12. The multi-mode one-way wrench according to claim 11, wherein the cover (61) includes an aperture (63) via which the stem (56) extends into the arched groove (72).

13. The multi-mode one-way wrench according to claim 1, including a handle (12) extending from the head (11).

Ansprüche

1. Multimodaler Einweg - Schreubenschlüssel, umfassend:

einen Kopf (11), der mit einer Kammer (16) und mit der Kammer in Verbindung stehenden Aussparungen (20) ausgebildet ist,

ein Zahnrad (30), das drehbar in der Kammer (16) angeordnet ist und mit Zähnen (31) ausgebildet ist, und

Sperrklinken (41, 51) zum wechselweisen Eingriff mit dem Zahnrad (30), welche jeweils schwenkbar in einer korrespondierenden der Aussparungen (20) angeordnet sind, wobei die Sperrklinken eine Führungssperrklinke (41) und wenigstens eine Folgesperrklinke (51) beinhalten, dadurch gekennzeichnet, dass die Folgesperrklinke (51) mit einem Schaft (56) ausgebildet ist, und

ein Schalter (70) an dem Kopf (11) angeordnet ist und mit wenigstens einer bogenförmigen Rille (72) zur Aufnahme und Führung des Schafts (56) ausgebildet ist, um die Folgesperrklinke (51) zwischen einem ersten Eingriffsmodus mit dem Zahnrad (30) und einem zweiten von dem Zahnrad (30) getrennten Modus zu bewegen, wobei die Aussparungen (20) zueinander in einem Winkel von 360°×(M+1/L)÷N schräg stehen, wobei L eine ganze Zahl ist, die der Anzahl der Aussparungen (20) entspricht, M eine beliebige geeignete ganze Zahl ist, und

wobei N eine ganze Zahl ist, die der Anzahl der Zähne (31) entspricht.

2. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, bei welchem der Schaft (56) entlang der bogenförmigen Rille (72) beweglich ist, wenn die Folgesperrkilinke (51) in dem zweiten Modus an den Zähnen (31) des Zahnrads (30) rattert.

3. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, welcher Federn (45, 55) umfasst, die jeweils in einer korrespondierenden der Aussparungen (20) angeordnet sind, um die korrespondierende Sperrklinke (41, 51) in Richtung des Zahnrads (30) vorzuspannen.

4. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, bei welchem jede der Aussparungen (20) eine Unteraussparung (24) beinhaltet, die in deren Wand ausgebildet ist, wobei jede der Sperrklinken (41, 51) eine Achse (42, 52) umfasst, die in die Unteraussparung (24) der korrespondierenden Aussparung (20) eingesetzt ist.

5. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 4, bei welchem jede der Aussparungen (20) einen Boden (25) und ein in dem Boden ausgebildetes Loch (26) aufweist, wobei die Achse (42, 52) von jeder der Sperrklinken (41, 51). ein reduziertes Ende aufweist, das in das Loch (26) der korrespondierenden Aussparung (20) eingesetzt ist.

6. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 4, bei welchem jede der Aussparungen (20) eine vertikale Fläche (23) umfasst, die sich neben der Unteraussparung (24) erstreckt, wobei die vertikale Fläche (23) gegen einen Keil (43) der korrespondierenden Sperrklinke drückt, welcher dann wiederum gegen einen Zahn des Zahnrads (30) drückt.

7. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 4, bei welchem jede der Sperrklinken (41, 51) einen Keil (43, 53) umfasst, der sich in einer radialen Richtung von der Achse (42, 52) erstreckt, wobei der Keil (43, 53) angepasst ist, um mit den Zähnen (31) des Zahnrads (30) in Eingriff zu kommen.

8. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 7, bei welchem sich der Schaft (56) von dem Keil (53) der Folgesperrklinke (51) erstreckt.

9. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, bei welchem der Schalter (70) schwenkbar mit dem Kopf (11) verbunden ist.

10. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, welcher eine Abdeckung (61) umfasst, die mit dem Kopf (11) verbunden ist, um das Zahnrad (30) in dem Kopf und den Schalter (70) an dem Kopf zu halten.

11. Multimodaler Einweg Schraubenschlüssel nach Anspruch 10, bei welchem die Abdeckung (61) zwischen dem Kopf (11) und dem Schalter (70) angeordnet ist.

12. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 11, bei welchem die Abdeckung (61) eine Öffnung (63) umfasst, durch welche sich der Schaft (56) in die bogenförmige Rille (72) erstreckt.

13. Multimodaler Einweg - Schraubenschlüssel nach Anspruch 1, welcher einen Griff (12) umfasst, der sich von dem Kopf (11) erstreckt.

Revendications

1. Clé unidirectionnelle multimode comportant:

une tête (11) réalisée avec une chambre (16) et des découpes (20) en communication avec la chambre;

une roue dentée (30) placée en rotation dans la chambre (16) et formée avec des dents (31); et

des cliquets (41, 51) pour un engrènement alterné avec la roue dentée et chacun étant placé en pivotement dans une découpe correspondante des découpes (20), dans laquelle les cliquets comportent un cliquet meneur (41) et au moins un cliquet suiveur (51), caractérisé en ce que le cliquet suiveur (51) est formé avec une tige (56); et

un aiguillage (70) placé sur la tête (11) et réalisé avec au moins une rainure arquée (72) pour recevoir et guider la tige (56) afin de déplacer le cliquet suiveur (51) entre un premier mode d'engrènement avec la roue dentée (30) et un second mode à distance de la roue dentée (30),

dans laquelle les découpes (20) sont décentrées les unes par rapport aux autres d'un angle de 360° x (M + 1/L) ÷ N,

dans laquelle L est un nombre entier pour représenter le nombre des découpes (20), M est tout nombre entier approprié, et N est un nombre entier pour représenter le nombre des dents (31).

2. Clé unidirectionnelle multimode selon la revendication 1, dans laquelle la tige (56) est mobile le long de la rainure arquée (72) lorsque le cliquet suiveur (51) vibre sur les dents (31) de la roue dentée (30) dans le second mode.

3. Clé unidirectionnelle multi-mode selon la revendication 1, comportant des ressorts (45, 55) placés chacun dans une découpe correspondante des découpes (20) pour décentrer le cliquet (41, 51) correspondant vers la roue dentée (30).

4. Clé unidirectionnelle multimode selon la revendication 1, dans laquelle chacune des découpes (20) comporte une sous-découpe (24) réalisée dans une paroi de celles-ci dans laquelle chacun des cliquets (41, 51) comporte un axe (42, 52) inséré dans la sous-découpe (24) de la découpe (20) correspondante.

5. Clé unidirectionnelle multimode selon la revendication 4, dans laquelle chacune des découpes (20) comporte un plancher (25) et un alésage (26) réalisé dans le plancher, dans laquelle l'axe (42, 52) de chacun des cliquets (41, 51) comporte une extrémité réduite insérée dans l'alésage (26) de la découpe (20) correspondante.

6. Clé unidirectionnelle multimode selon la revendication 4, dans laquelle chacune des découpes (20) comporte une face verticale (23) s'étendant près de la sous-découpe (24), dans laquelle la face verticale (26) pousse une clavette (43) du cliquet correspondant qui à son tour pousse une dent de la roue dentée (30).

7. Clé unidirectionnelle multimode selon la revendication 4, dans laquelle chacun des cliquets (41, 51) comporte une clavette (43, 53) s'étendant depuis l'axe (42, 52) dans une direction axiale, dans laquelle la clavette (43, 53) est adaptée pour un engrènement avec les dents (31) de la roue dentée (30).

8. Clé unidirectionnelle multimode selon la revendication 7, dans laquelle la tige (56) s'étend depuis la clavette (53) du cliquet suiveur (51).

9. Clé unidirectionnelle multimode selon la revendication 1, dans laquelle l'aiguillage (70) est raccordé en pivotement à la tête (11).

10. Clé unidirectionnelle multimode selon la revendication 1, comportant un couvercle (61) raccordé à la tête (11) pour garder la roue dentée (30) dans la tête et l'aiguillage (70) sur la tête.

11. Clé unidirectionnelle multimode selon la revendication 10, dans laquelle le couvercle (61) est placé entre la tête (11) et l'aiguillage (70).

12. Clé unidirectionnelle multimode selon la revendication 11, dans laquelle le couvercle (61) comporte une ouverture (63) via laquelle la tige (56) s'étend dans la gorge arquée (72).

13. Clé unidirectionnelle multimode selon la revendication 1, comportant un manche (12) s'étendant depuis la tête (11).

Drawing