Flip-up type seat

Abstract: A flip-up type seat has a seat member support (11, 21), a seat member, and a seat member coupling mechanism (13) interposed between the seat member support and the seat member to couple the seat member to the seat member support in such a way that the seat member can be freely moved between its horizontal seated position and its vertical flipped-up position. The seat member coupling mechanism cause the rear end of the seat member to be moved up and down in the vertically direction and the front end thereof forward and backward in the horizontal direction when the seat member is moved between its seated position and its flipped-up position.

Description: The present invention relates to a flip-up type seat having a seat member swingable between its seated position where it is kept substantially horizontal and its flipped-up position where it is kept substantially vertical. The flip-up type seats of this kind have been used as those for student desks in schools, those in conference rooms, theaters and stadiums, those for various kinds of works such as drawing, those in street-cars, buses and commuters' trains and those for public at stations and parks. In the conventional flip-up type seats, the seat member is swung around its rear end between its seated position where it is kept substantially horizontal in relation to its seat supports such as legs and its flipped-up position where it is kept substantially vertical in relation to them. Figs. 3 and 4 show a conventional flip-up type seat applied to a student desk with a seat. Reference numeral 1 denotes a plurality of narrow student desks arranged at certain intervals in a back and forth directions on a floor in a class room. Fig. 3 shows a flat floor, and Fig. 4 shows a stepped floor. Each of the student desks includes a plurality of legs 2 fixed on the floor and extended upward and a desk top 3 horizontally attached to the tops of the legs 2. Each of the student desks 1 excepting on the first line is provided with a flip-up type seat 4 for use by a student in a front line. Each flip-up type seat 4 is constructed by a pair of right and left brackets 5 fixed to and projected forward from vertical middle portions of a pair of legs 2 adjacent each other in the plural legs 2 of the student desk 1 on the second, third, ... x-th lines, a pair of right and left seat member support arms 7 swingably supported at their rear end portions by a shaft 6 which is supported horizontal by the paired right and left brackets 5, and a seat member 8 supported by the paired right and left seat member support arms 7. At positions above the paired right and left bracket 5, a seat back 9 is further attached to a pair of legs 2 adjacent to each other in the plural legs 2 of the student desk 1 on each of the second, third, ...x-th line. In the conventional flip-up type seat 4 having the above-described arrangement, the seat member 8 is located at its flipped-up position where it is swung vertical above the shaft 6, when the seat member 8 is not used. When the user wants to use the seat member 8, the seat member 8 is swung downward around the shaft 6 from its flipped-up position to its seated position where it is kept substantially horizontal. In most of the conventional flip-up type seats, a twisted coil spring (not shown) is attached to the shaft 6. The seat member 8 is therefore automatically forced from its seated position to its flipped-up position by the twisted coil spring when the seat member 8 is not used. In order to swing the seat member 8 around the shaft 6 from its flipped-up position to its seated position when the user want to use the seat member 8, the user must push the seat member 8 downward by his or her own hand or buttocks. When the user uses his or her own hand to swing the seat member 8 from its flipped-up position to its seated position, the user must take half-sitting pose with bending his or her waist or legs. When the user uses his own buttocks, the user must put his or her buttocks on the upward directed front end surface of the seat member 8 which has been flipped up, then sit down while moving his buttocks downward, and further then move backward his or her buttocks on the seat member 8 as the seat member 8 comes nearer its seated position. This is a quite complicated action. When the user stands up from his or her sitting pose on the seat member 8, the user must use his or her own hand or allow the urging means to swing the seat member 8 from its seated position to its flipped-up position, while keeping his or her half-sitting pose. The user must take unstable half-sitting pose in either case to swing the seat member 8 between its flipped-up position and its seated position. In the case of the conventional flip-up type seat 4, the distance B between the rear end of the desk top 3 and the front end of the seat member 8 which is on the way of its being swang is so set as not to catch his or her thighs or body between them while the user is taking half-sitting pose. This distance B thus set limits the size A of the seat member 8 in its back and forth directions. The limited size A does not give the user enough relaxation and comfort on the seat member 8. In the case of the flip-up type seats 4 having constructions which are obtained by removing the desk tops 3 from the student desks 1, and used in the theater, the user must stand up completely and swing the seat member 8 from its seated position to its flipped-up position so as to allow a person to pass through between the user and the seat 4 on the front line. The conventional flip-up type seat 4 is sometimes used while leaving its seat member 8 flipped-up. In this case, the user lightly puts his or her buttocks on the upward directed front end surface of the seat member 8 which has been flipped up. However, the front end surface of the seat member 8 has so small an area as to make him or her feel pain at his or her buttocks. In addition, the user's clothes are liable to be soiled and broken by the lower surface of the seat member 8 and the seat support arms 7, which are directed forward when it is flipped up. Further, the upper surface of the seat member 8 is directed backward when the seat member 8 is left flipped-up. In the class room where the floor is stepped as shown in Fig. 4, therefore, the upper surface of the seat member 8 is liable to be soiled by shoes of an user seated on the seat member 8 of the flip-up type seat 4 on the back line. US-A-1,761,673 discloses a folding seat. This folding seat may be attached to or set into a wall or partition for saving space in the room. In the flipped-up position the seat member and the back member form the front of a cabinet in which all other working parts being enclosed. For moving the seat member from closed to operative position the operator has to grasp a handle and to draw the seat member outwardly and upwardly and than have to push the seat member downwardly in which position the seat is than ready for use. From US-A-1,509,863 a flip-up seat is known which comprises spring means between the seat member and the seat support. This spring means causes the seat member to assume the flipped-up position if it is not occupied. The present invention is derived from the above-mentioned circumstances, and the object of the present invention is therefore to provide a flip-up type seat capable of making it unnecessary for the user to take an unstable pose when the seat member of the seat is moved between its flipped-up position to its seated position; making the user feel relaxed and comfortable when the user is seated on the seat member of the seat; making it unnecessary for the user to completely stand up from the seat member of the seat when a person must be passed through between the user and the flip-up type seat on the front line; preventing the user's clothes from being soiled and broken when the seat is used while leaving its seat member flipped-up; and preventing the upper surface of the seat member, which has been flipped up, from being soiled by shoes of an user who sits on the seat member of the seat in the back line. The object of the present invention can be achieved by a flip-up type seat according to the patent claim In the flip-up type seat according to the invention, the seat member which has been flipped up directs its rear end upward, its front end downward and its upper surface forward. When the user wants to sit on the seat member of the seat, therefore, the user only necessary to sit down with putting his or her buttocks on the rear end of the seat member. The seat member is thus moved from its flipped-up position to its seated position while moving vertically its rear end downward and horizontally its front end forward. The user's buttocks stays on the rear end of the seat member during this process. When the user wants to stand up, the user only necessary to lift his or her own buttocks upward. The seat member which has been at its seated position is pushed backward at its front end by backs of the user's knees or forced upward at its rear end by the urging means. The seat member is thus moved to its flipped-up position while moving its front end backward and its rear end upward. While returning to its flipped-up position, the seat member can follow the user's buttocks lifted with its upper surface being directed to the buttocks. This makes the user not to take the unstable pose while the seat member of the seat is moved between its flipped-up position and its seated position. Even if the size of the seat member in the back and forth directions is made larger so as to make the user feel relaxed and comfortable when the user seats on the seat member of the seat, his or her sitting and standing behavior cannot be disturbed by the rear end of the desk top and the front end of the seat member, although it was impossible in the case of the conventional flip-up type seat. When the user sitting on the seat member allows that a person pass through between the user and the flip-up type seat in the front line, the user is required to lift his or her buttocks only a little. Because the front end of the seat member is thus moved backward, the user can also move his knees backward. This can prevent the person from being disturbed by the user's knees. Since the seat member which has been at its flipped-up position directs its upper surface forward, the user who leans against the flipped-up seat member cannot be soiled on and be broken the user's clothes by the upper surface of the seat member. Further, the upper surface of the seat member flipped up cannot be soiled by shoes of a person who is seated on the seat member of the seat in the back line. In the flip-up type seat according to the invention the seat member coupling means includes link means constructed by two arms both ends of each of which being pivotably connected to the seat member support and the seat member with the connecting points of the two arms on the seat support being separated from each other and those on the seat member being also separated from each other. This seat member coupling means is simple in structure and operates smoothly. In the flip-up type seat according to the invention the seat member coupling means includes means for urging at least one of the two arms upward. This urging means enables the seat member to be automatically returned from its seated position to its flipped-up position. This invention can be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which: Fig. 1 is a side view showing student seats for student desks according to a first embodiment of a flip-up type seat of the present invention; Fig. 2 is a side view showing how the student seat for the student desk shown in Fig. 1 is operated; Fig. 3 is a side view showing a conventional student seat for a student desk set on a flat floor; and Fig. 4 is a side view showing the conventional student seat for the student desk set on a stepped floor. Various embodiments according to a flip-up type seat of the present invention will be described in detail with reference to Figs. 1 through 10. Figs. 1 and 2 show a student seat for a student desk according to a first embodiment of the flip-up type seat of the present invention. The structure of the student desk shown in Figs. 1 and 2 is the same as that of the conventional student desk described with reference to Figs. 3 and 4 with exception of the flip-up type seat of the first embodiment. Therefore, the same components of the desk shown in Figs. 1 and 2 as those of the conventional one shown in Figs. 3 and 4 will be denoted by the same reference numerals and detailed description of these components will be omitted. In the flip-up type seat 10 of this embodiment, a bracket 11 is fixed to each of a pair of neighboring legs 2 of each student desk 1 in each of the second, third fourth, ...x-th lines, at a position under a seat back 9, and projects forward from the legs 2. The brackets 11 fixed to the legs 2 constitutes a seat member support in the flip-up type seat 10. Each of two arms 15 and 16 is connected at its one end portion to the frontward projected end portion of each of the brackets 11 so as to be vertically freely pivotable with the connecting points of the two arms 15 and 16 to the same bracket 11 being separated from each other in the vertical direction. The other ends of the arms 15 and 16 are connected to front and rear positions of the corresponding one of paired seat member support frames 14 so as to be vertically freely pivotable, and the support frames 14 are fixed to the left and right side portions of the lower surface of a seat member 12. The two arms 15 and 16 connected freely pivotably to the two positions of the seat member support bracket 11 and the two positions of the seat member support frame 14 form link means, and the link means serves as a seat member coupling means 13 for making the seat member 12 move between a rested position where the seat member 12 is set substantially horizontal and a flipped-up position where the seat member 12 is set substantially vertical. An urging means constructed by a torsion coil spring 17 is wound around a pivotal center shaft of the one end portion of one arm 16, and the spring 17 urges the arm 16 upward. When the seat member 12 is not used in the flip-up type seat 10 of this embodiment, one arm 16 is urged upward by the torsion coil spring 17. Therefore, the link means of the two arms 15 and 16 moves the front end of the seat member 12 of the substantially horizontal seated position backward and the rear end thereof upward, and finally the seat member 12 is located at its vertical flipped-up position positioned before the seat back 9 at which the upper surface of the seat member 12 directs forward. When the user who wants to sit on the seat member 12, the user standing at first presses his or her buttocks against the upper surface of the flipped-up seat member 12, as shown in Fig. 1. The user then sits down, so that the seat member 12 is pushed down by his or her own buttocks against the urging force of the torsion coil spring 17. The seat member 12 of the flipped-up position is moved its front end forward and is moved its rear end portion downward, and finally the seat member 12 is located at its horizontal seated position at which the upper surface of the seat member 12 directs upward. When the user stands up, the above described process is reversed. Since the front end of the seat member 12 is moved in the back and fourth directions when the seat member 12 is moved between its flipped-up position and its seated position, the smallest distance C (Fig. 2) between the seat member 12 and the rear end of the desk top 3 is quite larger than that B in the case of the conventional flip-up type seat shown in Fig. 3. Even if the size A of the seat member 12 in the back and forth directions is made so larger than that of the conventional flip-up type seat as to make the user comfortable on the seat member 12, therefore, the user's thighs or buttock's can be prevented from being sandwitched between the seat member 12 and the rear end of the desk top 3 when the seat member 12 is moved between its flipped-up position and its seated position. When the user takes half-sitting pose while changing his or her pose from standing position to sitting position, the whole of his or her buttocks is supported by the upper surface of the seat member 12. Therefore, the user can be kept stable even when he or she takes half-sitting pose. As soon as the user lifts up his or her buttocks a little, the front end of the seat member 12 moves backward, thereby allowing his or her knees to be moved backward. When the legs 2 of the seat 10 have no desk top 3, therefore, the user does not required to lift his or her buttocks for a big distance in order to allow a person to pass through between the user and the lift-up type seat 10 of the front line. In a case that the user taking standing pose leans himself or herself against the seat member 12 of the flip-up type seat 10 which has been flipped up, the user's clothes contacts the upper surface of the seat member 12 which has been directed forward. This prevents the user's clothes from being soiled and broken by the seat member 12 which has been flipped up. In addition, since the user contacts the seat member 12 through its upper surface having large area, the user cannot feel any pain even when the user leans for a long time himself or herself against the seat member 12 which has been flipped up. Since the lower surface of the seat member 12 directs backward while the seat member 12 is in its flipped-up position, the upper surface of the seat member 12 which has not been used does not be soiled by shoes of the user who is now seated on the seat 10 in the behind line even if the flip-up type seats 10 are set on the stepped floor, as shown in Fig. 4.

Claims: A flip-up type seat comprising: a seat member support (2); a seat member (12); a seat member coupling means (13) interposed between said seat member support (2) and said seat member (12) to couple said seat member to said seat member support in such a way that said seat member can be freely moved between a seated position where said seat member is kept substantially horizontal and a flipped-up position where said member is kept substantially vertical, said seat member coupling means (13) causing a rear end of said member (12) to be moved up and down in a vertical direction and a front end thereof forward and backward in a horizontal direction when said seat member is moved between the seated position and the flipped-up position; and urging means (17) for urging said seat member (12) from the seated position toward the flipped-up position, characterized in that a cross-section of said seat member (12) in back and forth directions of said flip-up type seat has a shape such that a center portion of said seat member projects from both end portions of said seat member; the projecting center portion of said seat member (12) projects upward when said seat member (12) is arranged in the seated position, and the projecting center portion of said seat member (12) projects forward when said seat member (12) is arranged in the flipped up position; said seat member coupling means (13) includes a bracket (11) fixed to said seat member support (2), link means constructed by two arms (15, 16) arranged vertically with respect to each other, both ends of each of which being pivotably connected to said bracket (11) and to said seat member (12), connecting points of said two arms (15, 16) on said bracket (11) being separated from each other in a vertical direction when said seat member (12) is located in both the seated and flipped-up positions, and those on said seat member (12) being separated from each other in the vertical direction when said seat member (12) is located in the flipped-up position and being separated from each other in the vertical and back and forth directions when said seat member (12) is located in the seated position; and said urging means (17) is provided at the connecting point of the upper arm (16) of the link means on said bracket (11) for urging the upper arm (16) upward to move said seat member (12) from said seated position to said flipped-up position.

Inventors: YAMAZAKI RYOKICHI C O KOTOBUKI, YAMAZAKI, RYOKICHI, C/O KOTOBUKI CORPORATION
Applicants: KOTOBUKI CORP, KOTOBUKI CORPORATION
Application year: 1992
Main classification: A47C7
IPC codes: A47C1, A47C9, A47C7