CN2166998Y - Multi-function device for adjusting chair - Google Patents

Abstract

The utility model relates to a multi-function device for adjusting a chair. The utility model is composed of the double-shaft core rotary mechanism of a backrest, the rotary lift mechanism of a head-rest, and the rotary moving mechanism of a seat. The rotary mechanism of a backrest is composed of an upper rotary arm, a lower rotary arm and a handle control system arranged on the backrest. The rotary lift mechanism of a head-rest is composed of a ratchet wheel structure and a ratchet plate structure which have the advantages of rapid movement and reliable positioning. The rotary moving mechanism of a seat is composed of a flexible rolling bearing and a flexible slide guide rail. The multi-function device for adjusting a chair is used for individual seats for lying, meeting, dining, recreation for passengers in a passenger vehicle, and individual seats for passenger trains, passenger ships, passenger planes, and families.

Description

Multi-function device for adjusting chair

The utility model relates to and is used for objective use vehicle seat, the particularly setting device of palace car multifunction seat.This device also can be used on passenger train, passenger steamer, passenger plane, hotel, the home seating except that being mainly used in bus seat.

From the relevant Chinese patent literature that retrieves and Chinese non-patent literature, find and the data of the constructed scheme of the utility model, also find product in the relevant seat of domestic production and import with the constructed scheme of the utility model.Existing domestic seat, particularly bus seat generally do not have setting device, even the seat that has has certain setting device, but its adjustment project also is than mono-, and independent single function adjustment at backrest, headrest, seat is promptly only arranged, and its three kinds of adjusting mechanisms are unconnected.And the setting device of the multifunction seat that the utility model proposed is that seat is realized taking advantage of seat, lain on the back, and purposes such as desktop in order to make, and then must make three kinds of adjusting mechanisms belong to " multi-functional " general objective and a total technical conceive together.Obviously, the adjustment scheme of domestic existing seat is not enough to meet this requirement.

The approximate adjustment scheme of domestic existing seat is in the recent period: 1, handle control formula back of seat recliner.This back of seat recliner is two pivoted arms, leans forward and layback is 90 °.Its backward wing, be to utilize the control handle that is fixed on the mounting to come maneuver energy to make the clutch of the rack-pinion of backrest corner and location, and the restoring force of the wind spring on the dependence mounting and the back strength hand-power that contends with it reach and can make backrest layback purpose at any angle to 90 ° of scopes, thereby make the passenger can obtain certain comfort.But because the control handle of this kind recliner is to be on the mounting, after backrest has big corner, the passenger just is difficult to continue stably bar handle and applies back strength and hand-power, and the backrest corner just is difficult to accurately, just unavoidable " beating the back of the body " phenomenon that occurs when backrest rises.The Chinese utility model patent of delivering in the recent period " doublejointed angle regulator for automobile chair " (application number 91204611.2) as shown in Figure 3, Figure 4, this is an example of above-mentioned single function setting device.But this recliner is also being deposited defective aspect the reliability of positioning of backrest corner, its technical scheme is difficult to the garden and completely implements.2, the Chinese utility model patent of delivering in the recent period " active head restraint " (application number 91231249.1), as shown in Figure 5, it is " screw thread pair---plug helix " the cam-type angle modulation principle that adopts, the velocity of rotation of headrest is slower, and the headrest lifting mechanism is not arranged, be difficult to satisfy requirement of the present utility model.3, the seat cushion position of existing automotive seat generally can not be adjusted, and promptly enables to adjust, and also all is confined to straight line and adjusts, and the technical scheme that the straight line adjustment combines with rotation adjustment as the utility model is not found so far.Therefore, the adjusting mechanism at the backrest of existing domestic seat, headrest, seat all is not enough to satisfy the requirement of the utility model multifunction seat setting device.

The purpose of this utility model is, at the deficiency of technique scheme, its setting device carried out the structural development innovation, to satisfy the requirement of passenger traffic instrument such as palace car to individual seat's multifunction.

Technical solution of the present utility model is, be used for the passenger vehicles seat, particularly the setting device of palace car multifunction seat has: backrest twin shaft core rotating mechanism (2), headrest rotation lifting mechanism (1) and seat rotation travel mechanism (3); This backrest twin shaft core rotating mechanism (2) is by pivoted arm (4) (5) up and down, rotating shaft core (11) (9) up and down, pivoted arm location structure and handle control system constitute, the above-mentioned pivoted arm (4) of going up is with the backrest captive joint, the angular range that leans forward is 90 °, above-mentioned pivoted arm (5) down flexibly connects by the same seat bottom plate of lower shaft core (9) (7), the angular range of swinging back is 90 °, the above-mentioned last axle core (11) that passes through between the pivoted arm (4) (5) up and down flexibly connects, and above-mentioned handle control system is being controlled the clutch of rack-pinion (16) (17) and any rotation angle in 90 ° of scopes of backrest layback; The rotational action that this headrest rotates in the lifting mechanism (1) is made of the vertical rod (21) in the insertion backrest skeleton, the crossbeam (22) that connects vertical rod (21), the headrest rotational structure of rotating around crossbeam (22); The shift action that this seat rotates travel mechanism (3) is made of straight skidding guide rail (45) (46) and step pitch location structure; Special place of the present utility model is: following pivoted arm (5) under the backrest twin shaft core rotating mechanism (2) and base plate (7) are provided with and make backrest location failure-free " positioning plate (6)---locating dowel pin (8) " end points position limiting structure, under following pivoted arm (5) and cover plate (20) between be provided with backrest rotated flexibly, the location is reliably and " handle (13)---rack-pinion (16) (17)---wind spring (19) " the handle control system of rotating with backrest; Headrest rotation lifting mechanism (4) is adopting and is locating reliably, rotating fast-moving ratchet rotational structure and sour jujube plate lifting structure, and the ratchet corner is 0-45 °, and sour jujube plate lifting travel is the 0-50 millimeter; The seat rotates in the travel mechanism (3), and it is the motion adopted rolling bearing structure flexibly that the seat rotates, by 90 ° radially calibration carry out step pitch location of full garden week.

The utility model has the advantages that the setting device of multifunction seat is to realize seat comfortization, one of key factor of multifunction.On probation through inside to the utility model individual seat, proof the utlity model has tangible advantage: 1, owing to adopted handle control system and the positioning plate locating dowel pin structure that is installed on the backrest on the setting device of the multi-functional single seat of the utility model, be installed in the ratchet sour jujube plate structure on the headrest, be installed in the rotation moving structure on the seat, backrest can not rotate in the existing seat thereby suitably solved, backrest corner location is unreliable, when resetting, backrest " beats the back of the body ", headrest rotates slowly, headrest can not lifting, the seat only moves problem such as can not rotate, and can obtain the comfort at seat for the passenger, condition has been created in convenient sense.2, on tourist coach, can utilize finite space that this multi-functional single chair configuration is become apparatus such as conference table, dining table, amusing desk, sleeping berth, to produce the remarkable result of " chair is used more ", " car is used more ", for being used as sleeping berth and preventing that valuable vehicle is stolen, acquire a special sense at night.

Description of drawings of the present utility model:

Fig. 1 is the front schematic view of the utility model multifunction seat setting device.

Fig. 2 is the right side scheme drawing of the utility model multifunction seat setting device.

Fig. 3 is the front elevation of Chinese utility model patent " doublejointed angle regulator for automobile chair ".

Fig. 4 is the A-A cutaway view of Chinese utility model patent " doublejointed angle regulator for automobile chair ".

Fig. 5 is the structural representation of Chinese utility model patent " active head restraint ".

Fig. 6 is the front elevation of " backrest twin shaft core rotating mechanism " of the present utility model.

Fig. 7 is the A-A cutaway view of " backrest twin shaft core rotating mechanism " of the present utility model.

Fig. 8 is the back view of " backrest twin shaft core rotating mechanism " of the present utility model.

Fig. 9 is the left side view of the utility model " headrest rotates lifting mechanism ".

Figure 10 is the back view of the utility model " headrest rotates lifting mechanism ".

Figure 11 is the cutaway view of the utility model " seat rotates travel mechanism ".

Embodiment of the present utility model:

As depicted in figs. 1 and 2, the setting device of the utility model multifunction seat is installed in by symmetry that the backrest twin shaft core rotating mechanism (2) of the backrest left and right sides, the headrest that is installed in backrest upper end rotate lifting mechanism (1) and the seat rotation travel mechanism (3) that is installed on the seat bracket is formed.Placing the twin shaft core rotating mechanism in backrest left side partly is such as shown in Figure 6 and Figure 7 complete structure, that a part of structure that its symmetry is installed in the backrest right side has then lacked handle control system part, therefore only uses a left handle just can realize the control action of the layback and the rise of backrest.

As Fig. 6, Fig. 7 and shown in Figure 8, on backrest twin shaft core rotating mechanism (2), last pivoted arm (4) is with the backrest captive joint, base plate (7) rotates going up in the travel mechanism (3) with the seat and encloses (39) captive joint, handle (13) is positioned at the backrest lower left, locating dowel pin (8), lower shaft core (9), the same base plate of gear (17) (7) captive joint, an end of wind spring (19) is fixed on the lower shaft core (9), and the other end is fixed on the support (15) of cover plate (20).The same cover plate of following pivoted arm (5) (20) by last axle core (11) captive joint, and jointly around lower shaft core (9) rotation, also is provided with handle (13), tooth bar (16), tooth bar support (14), gear (17) therebetween.The outside of following pivoted arm (5) is provided with around the positioning plate (6) of pivot pin (10) rotation and the last pivoted arm (4) that rotates around last axle core (11).The same pivoted arm (5) down of pivot pin (10) is being captiveed joint with cover plate (20), and positioning plate (6) and tooth bar (16) rotate on it.The same pivoted arm (5) down of pivot pin (18) is being captiveed joint with cover plate (20), and handle (13) rotates on it.One end of the extension spring (12) that handle (13) resets is fixed on the handle (13), and the other end is fixed on the cover plate (20).

Making pivoted arm (4) is to limit step (A) on the pivoted arm (4) by the limit (A) on the positioning plate (6) around lean forward 90 ° endpoint location of last axle core (11), limit limit (B) on the positioning plate (6) by the step (B) on the base plate (7), limit down step (G) on the pivoted arm (5) by locating dowel pin (8), limit limit (E) on the positioning plate (6) by the step (E) on the base plate (7).

The endpoint location that makes pivoted arm (4) return to setting by leaning forward be by following pivoted arm (5) top bar (D) limit step (D) on the pivoted arm (4), limit limit (B) on the positioning plate (6) by the step (B) on the base plate (7), to prevent the continuation layback of backrest; Limit limit (E) on the positioning plate (6) by the step (E) on the base plate (7), limit down step (G) on the pivoted arm (5), lean forward to prevent that backrest is possible by locating dowel pin (8).

Making backrest when layback is not to limit step (D) on the pivoted arm (4) by the step (D) on the pivoted arm (5) down around last axle core (11) rotation around lower shaft core (9) rotation and not only, and the limit (B) on the positioning plate (6) cross on the base plate (7) step (B) afterwards, its boss (C) enters into the groove (C) on the pivoted arm (4), last pivoted arm (4), following pivoted arm (5), cover plate (20) form as a whole, when making the backrest layback, only around axle core (9) rotation, not around last axle core (11) rotation.Like this, backrest when 90 ° of lower shaft core (9) layback formed sleeping berth face just with the seat cushion flush, backrest leans forward around last core (11), and formed backrest desktop just is higher than the seat cushion surface 90 ° the time, is convenient to the passenger and takes one's seat.This has just satisfied seat can form the multi-functional demand of taking advantage of seat, desktop and sleeping berth.

The endpoint location that makes 90 ° of backrest layback is to limit down step (F) on the pivoted arm (5) by locating dowel pin (8), limit step (D) on the pivoted arm (4) by the step (D) on the following pivoted arm (5), limit groove (C) on the pivoted arm (4) by the platform convex (C) on the positioning plate (6), limit tooth bar (16) by gear (17).

The endpoint location that makes backrest return to setting by layback is to limit down step (G) on the pivoted arm (5) by locating dowel pin (8), limit limit (E) on the positioning plate (6) by the step (E) on the base plate (7), by the groove (C) on the pivoted arm (4) in boss (C) disengaging on the positioning plate (6), by step (B) contact edge (B).

Backrest is in 90 ° of scopes of layback can rotates smoothly and locate when arbitrarily angled, appropriately use the handle control system.If the people is against on the backrest, with handle (13) when outwards passing, handle (13) rotates around pivot pin (18), chute (J) on the handle (13) and boss (H) then force tooth bar (16) and support (14) to leave gear (17), backrest helps back strength and palm power to overcome the restoring force of wind spring (19) nationality, makes backrest layback arbitrarily angled to 90 ° of scopes.If abandon the thrust on the handle (13) this moment, tooth bar (16) will recover engagement by same gear (17) under the combined action of the restoring force of extension spring (12) and the boss (H) on the handle (13), chute (J), and backrest then rests on this angle.Because the extension spring (12) on the handle (13) makes its boss (H) withstand the limit (H) of tooth bar (16) all the time, tooth bar (16) is meshing securely with regard to same gear (17).If the cancellation back strength is to the effect of backrest, when only outwards passing handle (13) with hand, because the effect of wind spring (19) restoring force, backrest will be subjected to the restriction of limit (B), limit (E) and step (G) and return to the erection position.If abandon back strength and hand-power is done the time spent to backrest, backrest is then slack.

This shows, when the people against backrest on and when outwards passing handle (13), as long as back strength and palm power is greater than the restoring force of wind spring (19), backrest is then swung back, as less than, backrest then rises.Have only the restoring force of using back strength and palm power to come balance wind spring (19) rightly, just can alleviate " beating the back of the body " phenomenon of backrest.When the people stands, then can use palm power to alleviate this " beating the back of the body " phenomenon separately.

As Fig. 9 and shown in Figure 10, headrest rotates lifting mechanism (1) and is made of rotational structure and lifting structure.Headrest-plate (28) is one with the headrest captive joint with helical pitch plate (27) weldering.Vertical rod (21), crossbeam (22), ratchet plate (25), front limit plate (30) and rear position margining plate (24) also weld and are one.Two vertical rods (21) are inserted in the aperture of backrest skeleton, and the ratchet on the positioning plate in the aperture (34) inserts in the ratchet slot of vertical rod (21), makes vertical rod (21) stop lifting, and the range of vertical rod (21) is the 0-50 millimeter.When upwards pulling is rested the head on hand, under the effect of extension spring (33), but step pitch rising height of headrest.When unclamping the locking pin (32) that is used to connect positioning plate (34) and extension spring (33), and after withdrawing from ratchet on the positioning plate (34), but step pitch is fallen height of headrest.Headrest-plate (28) can rotate 45 ° forward around crossbeam (22).Ratchet (26) is to slide in the chute of helical pitch plate (27), leans on the effect of extension spring (29) that the same ratchet of ratchet (26) (25) is meshed reliably.According to the headrest needs, separating plate (31) can back and forth rotate between positioning plate (24), (30) around crossbeam (22).When ratchet (26) marches to bottom dead point on ratchet, and when the limit (R) of front limit plate (30) is collided on the limit of helical pitch plate (27) (L), because the cancave cambered surface (Q) on the separating plate (31) is higher than the tooth top on the ratchet plate (25), ratchet (26) is just because inertia concerns that being forced to leave ratchet plate (25) enters among the cancave cambered surface (Q).Want this moment limit (L) distance (K) of special requirement ratchet (26) dewclaw point (M) to the helical pitch plate (27) should be between arc tip (N) on the separating plate (31), (P) to its limit (R) distance (N), (P), can enter steadily among the cancave cambered surface (Q) with guarantee ratchet (26).Among ratchet (26) is in cancave cambered surface (Q), and abandon the do time spent of hand to headrest, ratchet (26) and separating plate (31) then return back to the top dead point place of rear position margining plate (24) and ratchet plate (25) again under the effect of extension spring (23).At this moment, owing to the tampering action of separating plate (31) to rear position margining plate (24), ratchet (26) is ejected cancave cambered surface (Q), and falls into ratchet slot.After this, headrest can carry out new next time rotation again.If headrest plans again to be returned to angle at the beginning after turning to a certain angle, then require headrest is turned to bottom dead point, automatically return to thereafter after the top dead point, just begin to rotate, and can not directly return back to angle at the beginning by a certain angle to angle at the beginning.Above-mentioned is exactly that this headrest is used this important technology feature of ratchet sour jujube plate structure---fast, accurately, the effect of unidirectional action.

As shown in figure 11, seat rotation travel mechanism (3) is made of rotational structure and moving structure.On rotational structure, the following circle (40) of antifriction-bearing box is with outer part (46) captive joint of longitudinal rail, and last circle (39) is with base plate (7) captive joint on the backrest twin shaft core rotating mechanism (2).On the last plane of Xia Quan (40), press radially 4 positioning through hole of 90 ° of angles making respectively, only make a positioning through hole with diameter in the corresponding position of Shang Quan (39).Housing (36) and handle (38) are fixed in the axial location place of the positioning through hole of Shang Quan (39), and latch (35) and stage clip (37) move in cover (36), and the cam portion of handle (38) contacts with the flanged plate bottom surface of latch (35).When the cam summit on the handle (38) was in upper/lower positions, the bottom of latch (35) extend under the effect of stage clip (37) in the some positioning through hole that enclose (40) down, thereby the seat is positioned on certain 90 ° of subangle.When the cam summit on the handle (38) was in uppermost position in fig-ure, stage clip (37) was compressed, and the positioning through hole of Xia Quan (40) is then withdrawed from the bottom of latch (35), and the seat is just free to rotate.On moving structure, the outer part (46) of longitudinal rail encloses (40) captive joint down with antifriction-bearing box, and internals (45) are with the seat support captive joint.Outer part (46) is gone up slippage in internals (45), and the longest skidding distance is 120 millimeters, and the slippage step pitch is 20 millimeters.Outer part (46) is gone up and is made a positioning groove (T), also makes several on the internals (45) with the positioning groove (T) of step pitch with width.Support arm (43) on the locking clip is fixed on the sidewall of outer part (46).Curved end (S) on jump ring (41) is stuck on the support arm, and when depressing handle (42), its lower end (T) then is inserted among the positioning groove (T) of internals (45), and longitudinal rail is then located.Because the effect of stage clip (44) makes that (S) end on the jump ring (41) can stably be on the original position with (T) holding.When pull-up handle (42), lower end (T) then withdraws from the positioning groove (T) and the sidewall against the positioning groove (T) on the outer part (46) of internals (45), but longitudinal rail and seat move with regard to step pitch.

On probation through the utility model patent application person to the inside of above-mentioned setting device, confirm that this device is feasible.It makes the passenger can obtain also the multi-functional single seat of many playscripts with stage directions can be carried out combination accessory and use comfort and the convenient sense except that being used for single multifunction seat, demonstrates it and has more specifically function.Such as, 1, combination accessory with this kind seat on the tourist coach of three arrange seatses uses.If will first change 180 ° behind row's seat, the second series back of seat leans forward 90 °, and the 3rd row's seat is motionless, then can realize talking, has a dinner, purposes such as amusement; If the left-side seat of first row, second series is turned right 90 °, right-side seat is turned left 90 °, 90 ° of the 3rd row's back of seat layback, and headrest is suitably adjusted, and then can realize purposes such as sleeping berth.2, have four row above seat tourist coach on can implement above-mentioned two kinds of allocation plans more easily.Here it is in order to realize the specific embodiment of " chair is used more " " car is used more ".

Claims (9)

1, a kind of setting device of multifunction seat has: backrest twin shaft core rotating mechanism (2), headrest rotate lifting mechanism (1) and the seat rotates travel mechanism (3); This backrest twin shaft core rotating mechanism (2) is by pivoted arm (4) (5) up and down, rotating shaft core (11) (9) up and down, pivoted arm location structure and handle control system constitute, the above-mentioned pivoted arm (4) of going up is with the backrest captive joint, the angular range that leans forward is 90 °, above-mentioned pivoted arm (5) down flexibly connects by the same seat bottom plate of lower shaft core (9) (7), the angular range of swinging back is 90 °, the above-mentioned last axle core (11) that passes through between the pivoted arm (4) (5) up and down flexibly connects, and above-mentioned handle control system is being controlled the clutch of rack-pinion (16) (17) and any rotation angle in 90 ° of scopes of backrest layback; This headrest rotates the rotational action in the lifting mechanism (1), is made of the vertical rod (21) in the insertion backrest skeleton, the crossbeam (22) that connects vertical rod (21), the headrest rotational structure of rotating around crossbeam (22); The shift action that this seat rotates in the travel mechanism (3) is made of longitudinal sliding motion guide rail (45) (46) and step pitch location structure; Feature of the present utility model is: following pivoted arm (5) under the backrest twin shaft core rotating mechanism (2) and base plate (7) are provided with and make backrest location failure-free " positioning plate (6)-locating dowel pin (8) " end points position limiting structure, are provided with " handle (13)-rack-pinion (16) (17)-wind spring (19) " the handle control system that makes backrest rotate flexibly, locate reliably and rotate with backrest between affiliated following pivoted arm (5) and the cover plate (20); Headrest rotates adopting on the lifting mechanism (1) locatees reliably, rotates fast-moving ratchet rotational structure and sour jujube plate lifting structure; The seat rotates in the travel mechanism (3), and it is the motion adopted rolling bearing structure flexibly that the seat rotates.

2, the setting device of multifunction seat according to claim 1, it is characterized in that: on the backrest twin shaft core rotating mechanism (2), last pivoted arm (4) is to be limited the step (A) of pivoted arm (4) by the limit (A) on the positioning plate (6) around lean forward 90 ° endpoint location of last axle core (11), limit limit (B) on the positioning plate (6) by the step (B) on the base plate (7), limit down step (G) on the pivoted arm (5) by locating dowel pin (8), limit limit (E) on the positioning plate (6) by the step (E) on the base plate (7).

3, the setting device of multifunction seat according to claim 1, it is characterized in that: on the backrest twin shaft core rotating mechanism (2), last pivoted arm (4) returns to setting by leaning forward endpoint location is to limit limit (D) on the pivoted arm (4) by the step (D) on the pivoted arm (5) down, limit limit (B) on the positioning plate (6) by the step (B) on the base plate (7), limit limit (E) on the positioning plate (6) by the step (E) on the base plate (7), limit down step (G) on the pivoted arm (5) by locating dowel pin (8).

4, the setting device of multifunction seat according to claim 1, it is characterized in that: on the backrest twin shaft core rotating mechanism (2), backrest layback to 90 ° endpoint location is to limit down step (F) on the pivoted arm (5) by locating dowel pin (8), limit limit (D) on the pivoted arm (4) by the step (D) on the following pivoted arm (5), limit groove (C) on the pivoted arm (4) by the boss (C) on the positioning plate (6), limit tooth bar (16) by gear (17).

5, the setting device of multifunction seat according to claim 1, it is characterized in that: on the backrest twin shaft core rotating mechanism (2), the endpoint location that backrest returns to setting by layback is to limit down step (G) on the pivoted arm (5) by locating dowel pin (8), limited limit (E) on the positioning plate (6) by the step (E) on the base plate (7), by the groove (C) on the pivoted arm (4) in boss (C) disengaging on the positioning plate (6), limit limit (B) on the positioning plate (6) by the step (B) on the base plate (7).

6, the setting device of multifunction seat according to claim 1, it is characterized in that: on the backrest twin shaft core rotating mechanism (2), any location of 90 ° of scopes of backrest layback is to hold handle (13) by extension spring (12), push down support (14) and tooth bar (16) by the chute (J) on the handle (13), push down boss (H) on the tooth bar (16) by the boss (H) on the handle (13), limit tooth bar (16) by gear (17).

7, the setting device of multifunction seat according to claim 1, it is characterized in that: headrest rotates on the lifting mechanism (1), concave arc (Q) on the separating plate (31) is higher than the tooth top of ratchet, and the distance (K) on the limit (L) of the pawl point (M) on the ratchet (26) to the helical pitch plate (27) is in arc tip (N) on the separating plate (31) (P) between the distance (N) and distance (P) of its limit (R).

8, according to the setting device of claim 1 or 7 described multifunction seats, it is characterized in that: headrest rotates on the lifting mechanism (1), and it is 45 ° that headrest-plate (28) rotates forward around crossbeam (22), and headrest vertical rod (21) lifting is the 0-50 millimeter.

9, the setting device of multifunction seat according to claim 1, it is characterized in that: the seat rotates in the travel mechanism (3), be used on the last plane of following circle (40) of the antifriction-bearing box that rotates at the seat respectively respectively making a positioning through hole by 90 ° of angles radially, a corresponding position of going up the plane at Shang Quan (39) makes the positioning through hole with diameter, this axially bored line position of going up the plane at Shang Quan (39) is provided with by latch (35), housing (36), stage clip (37), the locating pin structure that handle (38) constitutes, last circle (39) then carry out step pitch location of full garden week by 90 ° of angles.

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