CA1324313C - Rocking chair - Google Patents
Rocking chairInfo
- Publication number
- CA1324313C CA1324313C CA000556402A CA556402A CA1324313C CA 1324313 C CA1324313 C CA 1324313C CA 000556402 A CA000556402 A CA 000556402A CA 556402 A CA556402 A CA 556402A CA 1324313 C CA1324313 C CA 1324313C
- Authority
- CA
- Canada
- Prior art keywords
- board
- seat
- seat board
- chair
- concaved
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C31/00—Details or accessories for chairs, beds, or the like, not provided for in other groups of this subclass, e.g. upholstery fasteners, mattress protectors, stretching devices for mattress nets
- A47C31/12—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons
- A47C31/126—Means, e.g. measuring means for adapting chairs, beds or mattresses to the shape or weight of persons for chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
- A47C3/02—Rocking chairs
- A47C3/025—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame
- A47C3/026—Rocking chairs with seat, or seat and back-rest unit elastically or pivotally mounted in a rigid base frame with central column, e.g. rocking office chairs; Tilting chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
- A47C7/441—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with adjustable elasticity
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/44—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame
- A47C7/445—Support for the head or the back for the back with elastically-mounted back-rest or backrest-seat unit in the base frame with bar or leaf springs
Landscapes
- Chairs Characterized By Structure (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A rocking chair is composed of a pedestal pole, a supporting arm mounted at the top portion of the pedestal pole extending to the front upper side of the chair, a seat board which is hinged at the front end of the supporing arm with its front edge, and a concaved connecting board hinged to the rear edge of the seat board with its front edge of both sides thereof. A first spring is provided at the hinged portions of the seat board and the concaved connecting board for energizing the concaves connecting board upwardly. A back rest is pivotally supported to the rear edge of the concaved connecting boards at both sides of its lower edge. A second spring is provided at the hinged portion of the concaved connecting board and the pivotally supported portion to energize the back rest toward the front side of the chair.
A rocking chair is composed of a pedestal pole, a supporting arm mounted at the top portion of the pedestal pole extending to the front upper side of the chair, a seat board which is hinged at the front end of the supporing arm with its front edge, and a concaved connecting board hinged to the rear edge of the seat board with its front edge of both sides thereof. A first spring is provided at the hinged portions of the seat board and the concaved connecting board for energizing the concaves connecting board upwardly. A back rest is pivotally supported to the rear edge of the concaved connecting boards at both sides of its lower edge. A second spring is provided at the hinged portion of the concaved connecting board and the pivotally supported portion to energize the back rest toward the front side of the chair.
Description
132~313 The present invention relates to a rocking chair a seat and a reclini.ng back rest oE which are supported by a spring, and particularly to a rocking chair in whic11 a relative position or an anqle between the seat and the back rest is automatically adjusted appropriately according to a body form of a person sitting on tlle cllair. .
Various kinds of rocking chairs of which back rests, seats and back rests can do rocking movements 1.5 OppOSill9 to repulsion of supporting springs caused by bodies of persons who sit thereon have been provided.
A chair of a type which can make rocking movement only in the back rest has a simple structure, which results in low manufacturing cost, however, because of the following reason, that is, in such a chair the seat is immovably made, so that the lower half of a body of a person who is sitting on the seat is compulsorily made to keep nearly same posture as that of his working time. Thus, no comfortable reclining condition can be ~ ~2 ~ 3 ~ ~{
obtained. In addition, when the back rest is inclined, the back of the sitting person is rubbed up by the back rest of the chair, which gives him quite uncomfortable feelings.
A rocking chair of a type which rocks the seat and the back rest as one block is unstable for the reason that when the chair rocks backwardly, the front edge of the seat raises, toes of the person who is sitting on the chair are departed from the floor, and because of an angle between the seat and the back rest being the same as that of the working time, no comfortable reclining condition can be obtained.
To obtain comfortable reclining condition there is provided a rocking chair of a type which is adapted that an angle between the seat and the back rest is gradually increased according to rocking movements of the chair. However, in the rocking chair of this type, though there are various and different conditions for those persons who sit or will sit on the chair, for example, in personal physique, liking, kinds of dressed clothes, etc., the angle between the seat and the back rest varies always constant rate, accordingly, the chair of this type can not always give comfortable feelings.
Further, there has been also provided a rockinq chair of a ~ype which comprises a locking device for locking the seat and the back rest at a position at which they can not make rocking movements. However, the conventional locking device is adapted that a locking rod is inserted between the seat and the pedestal or a lock pin is inserted in a pivot between the seat and the back rest, so that the lock i5 shaky, and both inserting and/or extracting operation is ratl-er difficult.
Further, it is also well known that a rocking chair provided witll a lever under the seat for locking it. One of them is disclosed in the Japanese Utility Mode] Publication No.59-5397, and according to the disclosure the chair can be switched to do rocking movement and/or unrocking movement by shifting positions of the locking lever, however, the position of the locking lever is not stable, accordingly it is liable to cause sudden relaxation of locked condition of the locking lever, which results in lacking in stability.
~ o object oE the present invention is to provide a rocking chair in which an angle between a seat and a reclining back rest is adjustable according to a load ca~sed by a sitting person.
Another object of the present invention is to provide a rocking chair in which height of the front edge o~ the seat is not varied even if the seat is in backward rocking movement.
~ urther object of the present invention is to provide a rocking chair which can adjust magnitude of ~ ~, 2 ~ ~J ..~ ~ ~
~ - 4 backward rocking movement according to loaded weight appl ed onto the seat.
An object of a still further aspect of the present invention is to provide a rocking chair comprising a locking device for fixing the seat in positions at which, as necessity requires, the seat does not pexform rocking movement.
By one broad aspect of this invention, a rocking chair is provided comprising a pedestal pole~ a supporting arm mounted at the top portion of the pedestal pole and extended to the front upper side of the chair; a seat board hinged at the front end of the supporting arm with the front edge thereof; a concaved connecting board hinged to the rear edge of the seat board with its front edge of both sides thereof; first spring means provided at the hinged portions of the seat board and the concaved connecting board for energizing the concaved connecting board upwardly; a back rest pivotally supported to the rear edge of the concaved connecting board at both sides of its lower edge; and second spring means provided at the hinged portion of the concaved connecting board and the pivotally supported portion to energize the back rest toward the front side of the chair.
The spring means for energizing the concaved connecting board and hence for energizing the seat board preferably is a plate or leaf spring which is mounted at one end on the supporting arm and at the other end thereof is mounted for raising the seat board. It is also preferred that such first spring means be provided at the underside of the seat board, and, .
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at that position, that it be contacted with a slidable block which is ad~ustable in the front and the back directions to energize the seat board. Preferably, the rocking chaix includes a screw and handle drive means for adjusting the slidable block in the front and the rear directions.
The rocking chair may further include a locking piece which may be inserted between the supporting arm and the seat board, and when such locking piece is inserted therebetween, downward rocking movement of the seat board is locked. The locking means preferably is adapted to be inserted or extracted from betwe~on the supporting arm and the seat board by a push-lock and push-release mechanism.
C\
-4B- ~ ~ 2 i ~ t~3 In the accompanying drawings:
Fig. 1 is a perspective view of a rocking chair as an embodiment of the present invention;
Fig. 2 is a sectional elevation of a seat supporting mechanism in the embodiment of the present invelltion;
Fig. 3 is a sectional view cut along A - A line in ~ig. 2;
Fig. 4 shows a schematic side view of a seat and a reclining back rest of the embodiment of the present invention;
Fig. S is a partially broken view cut along B - B
line in Fig. 4;
Fig. 6 is a front view of a connecting device of the embodiment of the present invention;
Fig. 7 is a sectional view cut along C - C line shown in Fig. 6;
.. ~ . . , -5- 1 ~
Fig. 8 is a schematic diagram showing a normal position and a backward rocking position of the seat and the reclining back rest of the embodiment of the present invention;
Fig. 9 is a sectional elevation of a seat supporting mecilanism of another ernbodiment of this invention;
Fig. 10 shows a sliding block of the supporting mechanism shown in Fig. 9;
Fig. 11 is a sectional view cut along D - D line showll in Fig. 9;
Fig. 12 is a sectional elevation of a seat supporting mechanism in the third embodiment of the present invention;
Fig. 13 is an enlarged sectional view cut along E
- ~ line shown in Fig. 12;
F'ig. 14 is an enlarged sectional view cut along F
- F line shown in Fig. 12;
Fig. 15 is a sectional view cut along G - G line 20 shown in Fig. 13;
Fig~ 16 is an enlarged sectional view cut along H
- H line sl-own in Fig. 14;
Fig. 17 is an expanded sectional view of a guide channel; and Fig. 18 is a sectional front view of a main parts o~ a variation of the locking device.
-6- ~ v~
Fig. 1 shows general appearance of a rocking chair according to the present invention. Figs. 2 and 3 show a supporting portion in the first embodiment in which a supporting plate (3) and a connecting socket (4) are provided at a supporting arm (2) mounted on the upper edge of a pedestal (1). A base board (5) on which a seat is mounted is hinged to the supporting arm (2) at its front edge by a shaft (6) inserted into the socket (4), and at the rear side of the base board (5) a bar (7) is horizontally provided.
At the front part of the supporting plate (3) there is provided a plate spring(s) (8) which is extended to the rearward direction of the base board (5) by a retaining plate (9) and a bolt (10). The end portion of the plate spring (8) contacts with the bar (7) and is held by the bar (7). Between the supporting plate (3) and the plate spring (8) a supporting rod (11) is inserted so as to be guided by the both ends of the supporting arm (2), and it is movable in both the front and rear directions. At the both sides of the front edges of the supporting arm (2) and the base board (5) there are provided two sets of tubular stoppers (12) coaxially with the shaft (6). Opposing faces of the respective stoppers (12) are cut out to a semi~circular shape, and each of the opposing faces there are formed projections (12a) respectively so that they may engage with each other with a gap (13) therebetween. The gap (13) is made so as to be parallel to an axial direction.
~ ~ 2 ~ ~ ~L~
When a person sits on the seat of the rocking chair, the base board (5) is rotated downwardly, by receiving elastic force of the plate spring (8), according to loaded weight, to a position at which the gap (13) vanishes. By shifting the position of the supporting rod (11) in the front-rear directions, and by adjusting a distance between a point at which the plate spring (8) is supported by the rod (11) and the bar, the elastic force of the plate spring (8) against the base board (5), i.e., against the seat can be controlled.
In Figs. 4 and 5 show a seating block which is constructed by a seating board (14), a reclining back rest (15) and a curved connecting board (16) which is disposed between the seating board (14) and the back rest (15). At the rear edge of the seating board (14) and the lower edge of the reclining back rest (15) there are provided protuberances (14a) and (15a), respectively, and they are fitted in recesses (16a) which are formed at the both edges of the connecting board (16). These side edges are hinged by connecting means (17), as shown in Figs. 6 and 7.
One of the connecting means (17) has a case (18) which is composed of a center plate (18a), a stopper (18b) and a pair of side plates (18c), and at the upper portion of the case (18) a connecting rod (19) on one end of which a setting piece (20) is instalied is provided through the side plates (18c). In the inside of the case (18) actuatiny blocks (21) are secured to the connecting rods (19) by pins (22) respectively. At the rear face of the actuating block (21) a slope (21a) inclining in the front upper direction is formed, and at the front face thereof a plate spring (23) is installed by a pressing plate (24) and bolts (25). The lower end ~23a) of the plate spring t23) is bent toward the front side and contacts with the stopper (18b).
As shown in Fig. 5, four sets of the connecting means (17) are installed at both the upper and the lower sides of the connecting board (16), and the connecting rods (19) are inserted into the seating board (14) and the back rest (15), and installed thereto by the setting pieces (20). The connecting rods (19) projecting to the outside of the connecting board (16) are connected with a flexible arm rest (26) at respective sides thereof.
When a person sits on the seat of the rocking chair of the above construction, the seating board (14) presses the plate spring (8) and slightly lowers, and if the sitting person further leans on the back rest (15) to take a rest, as shown by a two dots line in Fig. 8, the seating board (14) further inclinedly lowers, and the seating board (14), the back rest (15) and the connecting board (16) are pivoted about their hinges to each position at which the slope (21a) of each of the actuating blocks (21) in the connecting means (17) contacts with the face of the center plate (18a) of the case (18).
~ ~, 2 ii i 1! 3 - g Next, in Figs. 9 to 11, there is shown a seat supporting mechanism of the second embodiment of the present invention. In the seat supporting mechanism a U-shaped supporting arm (32) is mounted on the top S portion of a pedestal pole (31), and at the front end of the supporting arm (32) a horizontal connecting plate (33) is installed. A seat board (34) of a flax box shape is pivotally installed at the front portion of the supporting arm (32) by a shaft (35), and on the seat board (34) a seat is set (not shown). On the upper surface of the connecting plate (33) a pile of plate springs (36) are installed with a pressing plate (37) and bolts (38). The plate springs (36) are composed of a plurality of flat leaf springs of a same size, and each of the plate springs is piled one on another with a suitable space therebetween.
Holes (40) and (41) bored at each of central portions of the rear brim (34a) of the seat board (34) and a downwardly curved plate (39) of the underside thereof respectively rotatably support a screw shaft (42) and a handle (43) is provided at the projecting rear end of the shaft (42). A sliding block (44) is made of plastic material such as polyacetal etc., and the lower edge thereof is formed to be convex and U-shape. As shown in Fig. 10, a nut (4~) is fixed therein, and on both the front and rear faces holes (46~ are bored. The sliding block ~44) is engaged with the screw shaft (42) between the rear brim (34a) and the downwardly curve plate (39), and elastic force ~ ~ 2 i~
generated by the springs (36) serves to support the rear portion of the seat board (34) through the sliding block (44).
In Fig. 9 there is shown a state of the seat on which no person is sitting. The seat board (34) is slightly inclined (about 3 degrees) forwardly, and when a person sits on the seat, as shown by a broken line, the seat board (34) descends (about 8 degrees) by pressing the spring (36) to a position at which the under face thereof aligns with the upper inclining edge of the supporting arm (32).
Elastic force, i.e., repulsive force of the - springs (36) can be controlled to any desired level by adjusting effective length of the springs (36). The adjustment of the effective length is adjusted by varying a position of the sliding block (44) by rotating the handle (43). That is, in response to weight and liking of a person who is sitting on the seat, by operating the handle (43) suitably and adjusting repulsion of the springs (36) so that the sitting person can easily make himself comfortable.
Figs. 12 to 18 show a locking device for unrocking a rocking chair, that is, the third embodiment of the present invention. In this embodiment a pedestal pole (51), a supporting arm (52), a connecting plate (53), a seat board (54), a pivotal shaft t55), a spring (56), a pressing plate (57), bolts (5B), plate ~59), a screw shaft (60), a handle (61) and a sliding block (62) are same as respective parts corresponding to those of the second embodiment.
Referring to Figs. 12, 13, 14 and 15, there is shown a supporting plate (68) having downwardly curved brim (63aj is installed at rear side of the pivotal shaft (55) disposed at the underside of the seat board (54), and between the seat board (54) and a receiving plate (64) provided thereunder a slidable locking piece (65) is inserted. The slidable locking piece (65) is actuated outwardly by springs (66) provided between itself and the brim (63a), and when the outer edge of it (slidable locking piece (65)) is inserted between the seat board (5~) and the upper edge (52a) of the supporting arm (52), it locks the seat board (54) at the highest position and prevents the seat board (54) from being downwardly inclined. At the inner front part of the locking piece (65) is connected to a handle (not shown) provided at the underside of the seat by a control wire (67), and at the inner rear part of the locking piece (65) an actuating pin (68) which is to engage with a guide plate (69) of a push-lock and push-release mechanism is downwardly projected.
As shown in Fig. 16, in the left half portion of the upper face of the guide plate (69) there is bored a winding guide channel (70) in which four stepped parts (71a), (71b), (71c) and (71d) of which sectional views are shown in Fig. 17. The guide channel (69) is pivotally supported with its right portion by a stud (72) provided at the underside of the supporting plate ~ ~ 2 1 3 ~ ~`d (63), and energized upwardly by a spring (73) disposed around the stud (72) so that the lower tip portion of the pin (68) may engage with the guide channel (70).
With these guide plate (69) and the guide pin (68), the push-lock and push-release mechanism is composed.
In the case of the pin (68) being in a first stop position (74) in the guide channel (70), if the wire (67) is pulled by operating the handle (61), the pin (68) is energized to advance to the right side in the guide channel (70) together with the locking piece (65). With this advancement the pin (68) is guided by vertical walls of the fourth stepped portion (71d), as shown by an arrow line in Fig. 16, and advances, by going over the first stepped portion (71a), up to a lower right corner between the first and the second stepped portions (71a) and (71b). Then, when the control wire (67) is loosened, the pin (68) is energized to move to the left side by the spring (66), and guided by the vertical walls to move as shown by the arrow line. The pin (68) is further moved so as to cross over the second stepped portion (71b) and stops at a recessed second position (75) between the second stepped portion (71b) and the third stepped portion (71c). According to the movement the locking piece (65) shifts to the right side by a distance between the first position (74) and the second position (75).
According to the shift of the locking piece (65), its left edge comes off between the seat board (54) and the upper edge (52a) of the supporting arm (52). Thus, the ~ '?
~ i.J~
seat hoard (54) is leased ~rom the locked state so that it may freely incline.
When the control wire (67) is pulled again, the pin ( 68) is guided by the vertical walls of the second stepped portion (71b) and advances to the upper corner of the guide channel (70) by crossing over the third stepped portion (71c). Next, when the control wire (67) is loosened, the pin ( 68) is energized by the spring ( 66) to move to the left side direction, and by crossing over the fourth stepped portion (71d) it returns to the first position ( 74) to stop there.
Then, the left edge of the locking piece (65) is again inserted between the seat board (54) and the upper edge ~ (52a) of the supporting arm (52) to lock rocking movements.
In Fig. 18 there is shown a variation of the above-described push-lock and push-lease mechanism. A
supporting arm (81) and s seat board (82) correspond to the supporting arm (52) and the seat board (54), respectively, and a supporting plate ( 83) and a receiving plate (84) also correspond to the supporting plate (63) and the receiving plate (64) respectively.
A locking piece (85) is slidably supported between the supporting plate (83) and the receiving plate (84), and with a spring (86) provided between the receiving plate (84) and a vertical partition (83a) of the supporting plate (83), the locking piece ~85) is energized to move to the outside ~in Fig. 18, right hand side), and when the outer edge thereof is inserted between the upper edge (81a) of the supporting arm (81) and the seat board (82), the seat board is locked. The inner side of the locking piece (85) is connected with a stud (88a) of an operating piece (88) which is slidably mounted on the supporting plate (83) by a wire ~87), At the upper side of an actuating pin (89) is provided, and the lower side thereof a knob (90) is attached.
A guide pla-te (92) on the underside of which a guide channel same as that of the afore-described is bored is pivotably provided on a base plate (91) which is installed on the supporting plate (83), and the upper end of the actuating pin (89) is fitted in the guide channel. In the device shown in Fig. 18 the locking piece (85) is inserted between the seat board (82) and the upper edge (81a) of the supporting arm (81) by the push-lock and puch-release mechanism constituted of a guide plate (92) and the pin (89) by repeating pressing or pushing the knob (90) opposing to the spring (86) by a finger (95) in a direction shown by an arrow, and then it is driven so as to come off therefrom: Thus, locking and/or releasing of rocking movements of the seat board (82) are performed.
In the rocking chair according to the present invention the seat is pivotally supported at its front edge by the pedestal stand, the back rest is pivotally hinged at the rear edge thereof through the connecting board, and each of joints is energized by respective springs, so that when a person sits on the seat, each of the joints aligns to transform one another according to a body form of the sitting person so that the seat and the back rest may form the most comfortable profile of the sitting person. Further, the back rest is pivotally installed at its lower edge, accordingly, since the lower edge does not protrude to press back of the sitting person, quite comfortable seat-feeling can be obtained and thus physical fatigue caused by long sitting time can be extremely reduced. In addition, according to the present invention, repulsion caused by elasticity of the spring supporting the seat is adjustable, so that according to weight, personal physique, liking or kinds of dressed clothes, the chair can be set the best comfortable condition.
When the sitting person leans on the bac~ rest, it slightly lowers together with the seat, so that the back of the sitting person is not rubbed up by the back res~ of the chair, accordingly, no unpleasant feeling is never occurred. The seat is pivoted at the front edge thereof, so that even the chair is being in backwardly slanting position, height of the front edge of the seat is constant, accordingly, there is no instability for causing feet or toes of the person to float away from the floor. Further, the seat, the connecting board and the back rest are pivotally installed at their both sides, so that by making center portions of them to somewhat concave shape, it is possible to obtain quite comfortable feeling in both working and resting forms for the person who sits on the chair can set his or her hip at the center of the seat.
It is further possible to lock the chair in the working form at which no rocking movement will occur by means of the afore-mentioned locking device as the third embodiment of the present invention.
Various kinds of rocking chairs of which back rests, seats and back rests can do rocking movements 1.5 OppOSill9 to repulsion of supporting springs caused by bodies of persons who sit thereon have been provided.
A chair of a type which can make rocking movement only in the back rest has a simple structure, which results in low manufacturing cost, however, because of the following reason, that is, in such a chair the seat is immovably made, so that the lower half of a body of a person who is sitting on the seat is compulsorily made to keep nearly same posture as that of his working time. Thus, no comfortable reclining condition can be ~ ~2 ~ 3 ~ ~{
obtained. In addition, when the back rest is inclined, the back of the sitting person is rubbed up by the back rest of the chair, which gives him quite uncomfortable feelings.
A rocking chair of a type which rocks the seat and the back rest as one block is unstable for the reason that when the chair rocks backwardly, the front edge of the seat raises, toes of the person who is sitting on the chair are departed from the floor, and because of an angle between the seat and the back rest being the same as that of the working time, no comfortable reclining condition can be obtained.
To obtain comfortable reclining condition there is provided a rocking chair of a type which is adapted that an angle between the seat and the back rest is gradually increased according to rocking movements of the chair. However, in the rocking chair of this type, though there are various and different conditions for those persons who sit or will sit on the chair, for example, in personal physique, liking, kinds of dressed clothes, etc., the angle between the seat and the back rest varies always constant rate, accordingly, the chair of this type can not always give comfortable feelings.
Further, there has been also provided a rockinq chair of a ~ype which comprises a locking device for locking the seat and the back rest at a position at which they can not make rocking movements. However, the conventional locking device is adapted that a locking rod is inserted between the seat and the pedestal or a lock pin is inserted in a pivot between the seat and the back rest, so that the lock i5 shaky, and both inserting and/or extracting operation is ratl-er difficult.
Further, it is also well known that a rocking chair provided witll a lever under the seat for locking it. One of them is disclosed in the Japanese Utility Mode] Publication No.59-5397, and according to the disclosure the chair can be switched to do rocking movement and/or unrocking movement by shifting positions of the locking lever, however, the position of the locking lever is not stable, accordingly it is liable to cause sudden relaxation of locked condition of the locking lever, which results in lacking in stability.
~ o object oE the present invention is to provide a rocking chair in which an angle between a seat and a reclining back rest is adjustable according to a load ca~sed by a sitting person.
Another object of the present invention is to provide a rocking chair in which height of the front edge o~ the seat is not varied even if the seat is in backward rocking movement.
~ urther object of the present invention is to provide a rocking chair which can adjust magnitude of ~ ~, 2 ~ ~J ..~ ~ ~
~ - 4 backward rocking movement according to loaded weight appl ed onto the seat.
An object of a still further aspect of the present invention is to provide a rocking chair comprising a locking device for fixing the seat in positions at which, as necessity requires, the seat does not pexform rocking movement.
By one broad aspect of this invention, a rocking chair is provided comprising a pedestal pole~ a supporting arm mounted at the top portion of the pedestal pole and extended to the front upper side of the chair; a seat board hinged at the front end of the supporting arm with the front edge thereof; a concaved connecting board hinged to the rear edge of the seat board with its front edge of both sides thereof; first spring means provided at the hinged portions of the seat board and the concaved connecting board for energizing the concaved connecting board upwardly; a back rest pivotally supported to the rear edge of the concaved connecting board at both sides of its lower edge; and second spring means provided at the hinged portion of the concaved connecting board and the pivotally supported portion to energize the back rest toward the front side of the chair.
The spring means for energizing the concaved connecting board and hence for energizing the seat board preferably is a plate or leaf spring which is mounted at one end on the supporting arm and at the other end thereof is mounted for raising the seat board. It is also preferred that such first spring means be provided at the underside of the seat board, and, .
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at that position, that it be contacted with a slidable block which is ad~ustable in the front and the back directions to energize the seat board. Preferably, the rocking chaix includes a screw and handle drive means for adjusting the slidable block in the front and the rear directions.
The rocking chair may further include a locking piece which may be inserted between the supporting arm and the seat board, and when such locking piece is inserted therebetween, downward rocking movement of the seat board is locked. The locking means preferably is adapted to be inserted or extracted from betwe~on the supporting arm and the seat board by a push-lock and push-release mechanism.
C\
-4B- ~ ~ 2 i ~ t~3 In the accompanying drawings:
Fig. 1 is a perspective view of a rocking chair as an embodiment of the present invention;
Fig. 2 is a sectional elevation of a seat supporting mechanism in the embodiment of the present invelltion;
Fig. 3 is a sectional view cut along A - A line in ~ig. 2;
Fig. 4 shows a schematic side view of a seat and a reclining back rest of the embodiment of the present invention;
Fig. S is a partially broken view cut along B - B
line in Fig. 4;
Fig. 6 is a front view of a connecting device of the embodiment of the present invention;
Fig. 7 is a sectional view cut along C - C line shown in Fig. 6;
.. ~ . . , -5- 1 ~
Fig. 8 is a schematic diagram showing a normal position and a backward rocking position of the seat and the reclining back rest of the embodiment of the present invention;
Fig. 9 is a sectional elevation of a seat supporting mecilanism of another ernbodiment of this invention;
Fig. 10 shows a sliding block of the supporting mechanism shown in Fig. 9;
Fig. 11 is a sectional view cut along D - D line showll in Fig. 9;
Fig. 12 is a sectional elevation of a seat supporting mechanism in the third embodiment of the present invention;
Fig. 13 is an enlarged sectional view cut along E
- ~ line shown in Fig. 12;
F'ig. 14 is an enlarged sectional view cut along F
- F line shown in Fig. 12;
Fig. 15 is a sectional view cut along G - G line 20 shown in Fig. 13;
Fig~ 16 is an enlarged sectional view cut along H
- H line sl-own in Fig. 14;
Fig. 17 is an expanded sectional view of a guide channel; and Fig. 18 is a sectional front view of a main parts o~ a variation of the locking device.
-6- ~ v~
Fig. 1 shows general appearance of a rocking chair according to the present invention. Figs. 2 and 3 show a supporting portion in the first embodiment in which a supporting plate (3) and a connecting socket (4) are provided at a supporting arm (2) mounted on the upper edge of a pedestal (1). A base board (5) on which a seat is mounted is hinged to the supporting arm (2) at its front edge by a shaft (6) inserted into the socket (4), and at the rear side of the base board (5) a bar (7) is horizontally provided.
At the front part of the supporting plate (3) there is provided a plate spring(s) (8) which is extended to the rearward direction of the base board (5) by a retaining plate (9) and a bolt (10). The end portion of the plate spring (8) contacts with the bar (7) and is held by the bar (7). Between the supporting plate (3) and the plate spring (8) a supporting rod (11) is inserted so as to be guided by the both ends of the supporting arm (2), and it is movable in both the front and rear directions. At the both sides of the front edges of the supporting arm (2) and the base board (5) there are provided two sets of tubular stoppers (12) coaxially with the shaft (6). Opposing faces of the respective stoppers (12) are cut out to a semi~circular shape, and each of the opposing faces there are formed projections (12a) respectively so that they may engage with each other with a gap (13) therebetween. The gap (13) is made so as to be parallel to an axial direction.
~ ~ 2 ~ ~ ~L~
When a person sits on the seat of the rocking chair, the base board (5) is rotated downwardly, by receiving elastic force of the plate spring (8), according to loaded weight, to a position at which the gap (13) vanishes. By shifting the position of the supporting rod (11) in the front-rear directions, and by adjusting a distance between a point at which the plate spring (8) is supported by the rod (11) and the bar, the elastic force of the plate spring (8) against the base board (5), i.e., against the seat can be controlled.
In Figs. 4 and 5 show a seating block which is constructed by a seating board (14), a reclining back rest (15) and a curved connecting board (16) which is disposed between the seating board (14) and the back rest (15). At the rear edge of the seating board (14) and the lower edge of the reclining back rest (15) there are provided protuberances (14a) and (15a), respectively, and they are fitted in recesses (16a) which are formed at the both edges of the connecting board (16). These side edges are hinged by connecting means (17), as shown in Figs. 6 and 7.
One of the connecting means (17) has a case (18) which is composed of a center plate (18a), a stopper (18b) and a pair of side plates (18c), and at the upper portion of the case (18) a connecting rod (19) on one end of which a setting piece (20) is instalied is provided through the side plates (18c). In the inside of the case (18) actuatiny blocks (21) are secured to the connecting rods (19) by pins (22) respectively. At the rear face of the actuating block (21) a slope (21a) inclining in the front upper direction is formed, and at the front face thereof a plate spring (23) is installed by a pressing plate (24) and bolts (25). The lower end ~23a) of the plate spring t23) is bent toward the front side and contacts with the stopper (18b).
As shown in Fig. 5, four sets of the connecting means (17) are installed at both the upper and the lower sides of the connecting board (16), and the connecting rods (19) are inserted into the seating board (14) and the back rest (15), and installed thereto by the setting pieces (20). The connecting rods (19) projecting to the outside of the connecting board (16) are connected with a flexible arm rest (26) at respective sides thereof.
When a person sits on the seat of the rocking chair of the above construction, the seating board (14) presses the plate spring (8) and slightly lowers, and if the sitting person further leans on the back rest (15) to take a rest, as shown by a two dots line in Fig. 8, the seating board (14) further inclinedly lowers, and the seating board (14), the back rest (15) and the connecting board (16) are pivoted about their hinges to each position at which the slope (21a) of each of the actuating blocks (21) in the connecting means (17) contacts with the face of the center plate (18a) of the case (18).
~ ~, 2 ii i 1! 3 - g Next, in Figs. 9 to 11, there is shown a seat supporting mechanism of the second embodiment of the present invention. In the seat supporting mechanism a U-shaped supporting arm (32) is mounted on the top S portion of a pedestal pole (31), and at the front end of the supporting arm (32) a horizontal connecting plate (33) is installed. A seat board (34) of a flax box shape is pivotally installed at the front portion of the supporting arm (32) by a shaft (35), and on the seat board (34) a seat is set (not shown). On the upper surface of the connecting plate (33) a pile of plate springs (36) are installed with a pressing plate (37) and bolts (38). The plate springs (36) are composed of a plurality of flat leaf springs of a same size, and each of the plate springs is piled one on another with a suitable space therebetween.
Holes (40) and (41) bored at each of central portions of the rear brim (34a) of the seat board (34) and a downwardly curved plate (39) of the underside thereof respectively rotatably support a screw shaft (42) and a handle (43) is provided at the projecting rear end of the shaft (42). A sliding block (44) is made of plastic material such as polyacetal etc., and the lower edge thereof is formed to be convex and U-shape. As shown in Fig. 10, a nut (4~) is fixed therein, and on both the front and rear faces holes (46~ are bored. The sliding block ~44) is engaged with the screw shaft (42) between the rear brim (34a) and the downwardly curve plate (39), and elastic force ~ ~ 2 i~
generated by the springs (36) serves to support the rear portion of the seat board (34) through the sliding block (44).
In Fig. 9 there is shown a state of the seat on which no person is sitting. The seat board (34) is slightly inclined (about 3 degrees) forwardly, and when a person sits on the seat, as shown by a broken line, the seat board (34) descends (about 8 degrees) by pressing the spring (36) to a position at which the under face thereof aligns with the upper inclining edge of the supporting arm (32).
Elastic force, i.e., repulsive force of the - springs (36) can be controlled to any desired level by adjusting effective length of the springs (36). The adjustment of the effective length is adjusted by varying a position of the sliding block (44) by rotating the handle (43). That is, in response to weight and liking of a person who is sitting on the seat, by operating the handle (43) suitably and adjusting repulsion of the springs (36) so that the sitting person can easily make himself comfortable.
Figs. 12 to 18 show a locking device for unrocking a rocking chair, that is, the third embodiment of the present invention. In this embodiment a pedestal pole (51), a supporting arm (52), a connecting plate (53), a seat board (54), a pivotal shaft t55), a spring (56), a pressing plate (57), bolts (5B), plate ~59), a screw shaft (60), a handle (61) and a sliding block (62) are same as respective parts corresponding to those of the second embodiment.
Referring to Figs. 12, 13, 14 and 15, there is shown a supporting plate (68) having downwardly curved brim (63aj is installed at rear side of the pivotal shaft (55) disposed at the underside of the seat board (54), and between the seat board (54) and a receiving plate (64) provided thereunder a slidable locking piece (65) is inserted. The slidable locking piece (65) is actuated outwardly by springs (66) provided between itself and the brim (63a), and when the outer edge of it (slidable locking piece (65)) is inserted between the seat board (5~) and the upper edge (52a) of the supporting arm (52), it locks the seat board (54) at the highest position and prevents the seat board (54) from being downwardly inclined. At the inner front part of the locking piece (65) is connected to a handle (not shown) provided at the underside of the seat by a control wire (67), and at the inner rear part of the locking piece (65) an actuating pin (68) which is to engage with a guide plate (69) of a push-lock and push-release mechanism is downwardly projected.
As shown in Fig. 16, in the left half portion of the upper face of the guide plate (69) there is bored a winding guide channel (70) in which four stepped parts (71a), (71b), (71c) and (71d) of which sectional views are shown in Fig. 17. The guide channel (69) is pivotally supported with its right portion by a stud (72) provided at the underside of the supporting plate ~ ~ 2 1 3 ~ ~`d (63), and energized upwardly by a spring (73) disposed around the stud (72) so that the lower tip portion of the pin (68) may engage with the guide channel (70).
With these guide plate (69) and the guide pin (68), the push-lock and push-release mechanism is composed.
In the case of the pin (68) being in a first stop position (74) in the guide channel (70), if the wire (67) is pulled by operating the handle (61), the pin (68) is energized to advance to the right side in the guide channel (70) together with the locking piece (65). With this advancement the pin (68) is guided by vertical walls of the fourth stepped portion (71d), as shown by an arrow line in Fig. 16, and advances, by going over the first stepped portion (71a), up to a lower right corner between the first and the second stepped portions (71a) and (71b). Then, when the control wire (67) is loosened, the pin (68) is energized to move to the left side by the spring (66), and guided by the vertical walls to move as shown by the arrow line. The pin (68) is further moved so as to cross over the second stepped portion (71b) and stops at a recessed second position (75) between the second stepped portion (71b) and the third stepped portion (71c). According to the movement the locking piece (65) shifts to the right side by a distance between the first position (74) and the second position (75).
According to the shift of the locking piece (65), its left edge comes off between the seat board (54) and the upper edge (52a) of the supporting arm (52). Thus, the ~ '?
~ i.J~
seat hoard (54) is leased ~rom the locked state so that it may freely incline.
When the control wire (67) is pulled again, the pin ( 68) is guided by the vertical walls of the second stepped portion (71b) and advances to the upper corner of the guide channel (70) by crossing over the third stepped portion (71c). Next, when the control wire (67) is loosened, the pin ( 68) is energized by the spring ( 66) to move to the left side direction, and by crossing over the fourth stepped portion (71d) it returns to the first position ( 74) to stop there.
Then, the left edge of the locking piece (65) is again inserted between the seat board (54) and the upper edge ~ (52a) of the supporting arm (52) to lock rocking movements.
In Fig. 18 there is shown a variation of the above-described push-lock and push-lease mechanism. A
supporting arm (81) and s seat board (82) correspond to the supporting arm (52) and the seat board (54), respectively, and a supporting plate ( 83) and a receiving plate (84) also correspond to the supporting plate (63) and the receiving plate (64) respectively.
A locking piece (85) is slidably supported between the supporting plate (83) and the receiving plate (84), and with a spring (86) provided between the receiving plate (84) and a vertical partition (83a) of the supporting plate (83), the locking piece ~85) is energized to move to the outside ~in Fig. 18, right hand side), and when the outer edge thereof is inserted between the upper edge (81a) of the supporting arm (81) and the seat board (82), the seat board is locked. The inner side of the locking piece (85) is connected with a stud (88a) of an operating piece (88) which is slidably mounted on the supporting plate (83) by a wire ~87), At the upper side of an actuating pin (89) is provided, and the lower side thereof a knob (90) is attached.
A guide pla-te (92) on the underside of which a guide channel same as that of the afore-described is bored is pivotably provided on a base plate (91) which is installed on the supporting plate (83), and the upper end of the actuating pin (89) is fitted in the guide channel. In the device shown in Fig. 18 the locking piece (85) is inserted between the seat board (82) and the upper edge (81a) of the supporting arm (81) by the push-lock and puch-release mechanism constituted of a guide plate (92) and the pin (89) by repeating pressing or pushing the knob (90) opposing to the spring (86) by a finger (95) in a direction shown by an arrow, and then it is driven so as to come off therefrom: Thus, locking and/or releasing of rocking movements of the seat board (82) are performed.
In the rocking chair according to the present invention the seat is pivotally supported at its front edge by the pedestal stand, the back rest is pivotally hinged at the rear edge thereof through the connecting board, and each of joints is energized by respective springs, so that when a person sits on the seat, each of the joints aligns to transform one another according to a body form of the sitting person so that the seat and the back rest may form the most comfortable profile of the sitting person. Further, the back rest is pivotally installed at its lower edge, accordingly, since the lower edge does not protrude to press back of the sitting person, quite comfortable seat-feeling can be obtained and thus physical fatigue caused by long sitting time can be extremely reduced. In addition, according to the present invention, repulsion caused by elasticity of the spring supporting the seat is adjustable, so that according to weight, personal physique, liking or kinds of dressed clothes, the chair can be set the best comfortable condition.
When the sitting person leans on the bac~ rest, it slightly lowers together with the seat, so that the back of the sitting person is not rubbed up by the back res~ of the chair, accordingly, no unpleasant feeling is never occurred. The seat is pivoted at the front edge thereof, so that even the chair is being in backwardly slanting position, height of the front edge of the seat is constant, accordingly, there is no instability for causing feet or toes of the person to float away from the floor. Further, the seat, the connecting board and the back rest are pivotally installed at their both sides, so that by making center portions of them to somewhat concave shape, it is possible to obtain quite comfortable feeling in both working and resting forms for the person who sits on the chair can set his or her hip at the center of the seat.
It is further possible to lock the chair in the working form at which no rocking movement will occur by means of the afore-mentioned locking device as the third embodiment of the present invention.
Claims (6)
1. A rocking chair comprising:
a pedestal pole;
a supporting arm mounted at the top portion of said pedestal pole and extended to the front upper side of the chair;
a seat board hinged at the front end of said supporting arm with the front edge thereof;
a concaved connecting board hinged to the rear edge of said seat board with its front edge at both sides thereof;
first spring means provided at said hinged portions of said seat board and said concaved connecting board for energizing said concaved connecting board upwardly;
a back rest pivotally supported at the rear edge of said concaved connecting board at both sides of its lower edge;
and second spring means provided at said hinged portion of said concaved connecting board and said pivotally supported portion to energize said back rest toward the front side of said chair.
a pedestal pole;
a supporting arm mounted at the top portion of said pedestal pole and extended to the front upper side of the chair;
a seat board hinged at the front end of said supporting arm with the front edge thereof;
a concaved connecting board hinged to the rear edge of said seat board with its front edge at both sides thereof;
first spring means provided at said hinged portions of said seat board and said concaved connecting board for energizing said concaved connecting board upwardly;
a back rest pivotally supported at the rear edge of said concaved connecting board at both sides of its lower edge;
and second spring means provided at said hinged portion of said concaved connecting board and said pivotally supported portion to energize said back rest toward the front side of said chair.
2. A rocking chair as claimed in claim 1, wherein said first spring means for energizing said concaved connecting board and hence for energizing said seat board is a plate or leaf spring which is mounted at one end on said supporting arm and at wherein said spring is mounted at the other end thereof for raising said seat board.
3. A rocking chair as claimed in claim 2, wherein said first spring means is provided at the underside of said seat board, and at said position, is contacted with a slidable block which is adjustable in the front and the rear directions to energize said seat board.
4. A rocking chair as claimed in claim 3, including a screw and handle drive means for adjusting said slidable block in the front and the rear directions.
5. A rocking chair as claimed in claim 1 including a locking piece for insertion between said supporting arm and said seat board, and, when said locking piece is inserted therebetween, downward rocking movement of said seat board is locked.
6. A rocking chair as claimed in claim 5, wherein said locking piece is inserted or extracted from between said supporting arm and said seat board by a push-lock and push-release mechanism.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987004886U JPH0531965Y2 (en) | 1987-01-19 | 1987-01-19 | |
| JP62-4886 | 1987-01-19 | ||
| JP62-69687 | 1987-05-12 | ||
| JP6968787U JPH0436677Y2 (en) | 1987-05-12 | 1987-05-12 | |
| JP62-71650 | 1987-05-15 | ||
| JP1987071650U JPH0537790Y2 (en) | 1987-05-15 | 1987-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1324313C true CA1324313C (en) | 1993-11-16 |
Family
ID=27276498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000556402A Expired - Fee Related CA1324313C (en) | 1987-01-19 | 1988-01-13 | Rocking chair |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1324313C (en) |
| DE (1) | DE3800751A1 (en) |
| NL (1) | NL188735C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3921755A1 (en) * | 1989-07-01 | 1991-01-10 | Koenig & Neurath Kg | WORK CHAIR WITH SEAT AND BACKREST |
| DE9003589U1 (en) * | 1990-03-28 | 1991-07-25 | Fritz Hansens Eft. A/S, Alleroed, Dk | |
| US5267777A (en) * | 1992-01-15 | 1993-12-07 | Lavaco Industries, Inc. | Resilient chair support |
| GB2271053A (en) * | 1992-09-30 | 1994-04-06 | Edward L Stulik | Reclining chair |
| DE4326609C2 (en) * | 1993-08-07 | 1996-03-28 | Taipei Design Center Duesseldo | Office swivel chair |
| DE4421597A1 (en) * | 1994-06-21 | 1996-01-04 | Link Wilhelm Kg | Chair, especially office chair |
| US5577811A (en) * | 1995-06-07 | 1996-11-26 | Hon Industries Inc. | Ergonomic chair |
| US6595584B1 (en) * | 2002-01-16 | 2003-07-22 | John W. Caldwell | Seating for individuals and for groups of individuals with various degrees of accommodation and distraction |
| US6773066B2 (en) * | 2002-09-17 | 2004-08-10 | John W. Caldwell | Control for a seat, and a seat incorporating it |
| US11589678B2 (en) | 2019-01-17 | 2023-02-28 | Hni Technologies Inc. | Chairs including flexible frames |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4077596A (en) * | 1975-06-18 | 1978-03-07 | Bliss & Laughlin Industries, Incorporated | Low silhouette chair tilting control assembly |
| DE3036993A1 (en) * | 1980-10-01 | 1982-05-13 | Wilkhahn Wilkening + Hahne GmbH + Co, 3252 Bad Münder | WORK SEAT |
| JPS595397Y2 (en) * | 1981-12-25 | 1984-02-17 | スガツネ工業株式会社 | Locking chair locking device |
| DE3629882A1 (en) * | 1986-09-02 | 1988-03-10 | Girsberger Holding Ag | SECURITY LOCK |
| DE3630503A1 (en) * | 1986-09-08 | 1988-03-10 | Girsberger Holding Ag | CHAIR |
-
1988
- 1988-01-13 DE DE19883800751 patent/DE3800751A1/en active Granted
- 1988-01-13 CA CA000556402A patent/CA1324313C/en not_active Expired - Fee Related
- 1988-01-19 NL NL8800112A patent/NL188735C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL8800112A (en) | 1988-08-16 |
| NL188735C (en) | 1992-09-16 |
| DE3800751A1 (en) | 1988-08-04 |
| NL188735B (en) | 1992-04-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |