CN1989878A - Rocking-chair for infantile - Google Patents

Rocking-chair for infantile Download PDF

Info

Publication number
CN1989878A
CN1989878A CN200610064113.3A CN200610064113A CN1989878A CN 1989878 A CN1989878 A CN 1989878A CN 200610064113 A CN200610064113 A CN 200610064113A CN 1989878 A CN1989878 A CN 1989878A
Authority
CN
China
Prior art keywords
infant
rocking chair
rocking
radius
curvature
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.)
Granted
Application number
CN200610064113.3A
Other languages
Chinese (zh)
Other versions
CN1989878B (en
Inventor
薗田二郎
荻野元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Combi Corp
Original Assignee
Combi Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Combi Corp filed Critical Combi Corp
Publication of CN1989878A publication Critical patent/CN1989878A/en
Application granted granted Critical
Publication of CN1989878B publication Critical patent/CN1989878B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47DFURNITURE SPECIALLY ADAPTED FOR CHILDREN
    • A47D13/00Other nursery furniture
    • A47D13/10Rocking-chairs; Indoor swings ; Baby bouncers
    • A47D13/102Rocking-chairs; Indoor swings ; Baby bouncers with curved rocking members resting on the ground
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47DFURNITURE SPECIALLY ADAPTED FOR CHILDREN
    • A47D1/00Children's chairs
    • A47D1/002Children's chairs adjustable
    • A47D1/004Children's chairs adjustable in height
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47DFURNITURE SPECIALLY ADAPTED FOR CHILDREN
    • A47D1/00Children's chairs
    • A47D1/08Children's chairs convertible to a rocking chair

Abstract

The invention provides a rocking chair for infant capable of rocking in the propriety declining range, even seating by the newborn and so on low moon's age with light body weight infants, without high frequency and destroying balance of the whole rocking chair. In the rocking chair (1) for infant with a seat part (7) and a foot part (5), the curvature radius of the back end is set to the curvature radius larger than the middle part, in which, the seat part (7) has a seat (2) carrying the infant by the state of supporting back, the foot part (5) connects to the seat part (7) and is provided with a bending part (30) extending from the middle part to the back end part.

Description

Rocking-chair for infantile
Technical field
The present invention relates to rocking-chair for infantile.
Background technology
Rocking chair has seat that the user takes a seat and with this binding and have the foot of bend, by being positioned on the floor, bend contacts with floor, and owing to bend shakes with respect to floor, thereby rocking chair integral body is shaken with making us feeling good.And the bend of the foot of its common rocking chair has certain radius of curvature (for example, with reference to patent documentation 1).
[patent documentation 1] spy opens the 2003-210271 communique
Structurally there is gently frequency height then of user in such rocking chair, the heavy then low tendency of frequency of user.And for the infant, body weight was about 10kg when the monthly age was 12 months, but neonatal body weight is about 3kg, was below 1/3 of infant.Therefore, under the situation of rocking-chair for infantile, even provide suitable frequency, the too high problem of vibration frequency in the time of also can existing the neonate to use for high infant of monthly age.On the other hand, also have following tendency: if the radius of curvature of rocking chair is little, then frequency is low, if radius of curvature is big, and frequency height then.Therefore, also consider to make rocking chair and reduce radius of curvature on the whole in order to provide appropriate frequency to the neonate, if but reduce radius of curvature, then there is following problem: the balance variation of rocking chair integral body, and also the inclination when shaking is excessive, thus rocking chair falls down along front and back easily.
Summary of the invention
Even the object of the present invention is to provide the light infant of a kind of body weight to take, frequency is not high yet, can not destroy the balance of rocking chair integral body, and the rocking-chair for infantile that can shake in the scope that suitably tilts.
The present inventor furthers investigate in order to solve described problem, obtains following invention.The center of gravity that is the infant is positioned at more than the buttocks, but along with growth, and health becomes big on the whole, thus the distance of this center of gravity and buttocks also away from.Like this, even the distance change of center of gravity and buttocks, when taking a seat under the back keeps vertical state, the change of center of gravity on horizontal level is also little.But,, under near the state of facing upward that the back is supported on the backrest, it is occupied on the rocking chair because sit on the seat under the state that the infant can not stand at the back.And when being placed on the infant on the rocking chair, the position of buttocks and monthly age are irrelevant substantially, basically keep certain, but as mentioned above, because infant's center of gravity when growing up away from buttocks, so it is together rearward mobile with infant's growth to place infant's the center of gravity of rocking chair integral body.The present invention has utilized just: 1) when the infant uses rocking chair, and the character that center of gravity and monthly age move together; 2) the light frequency height then of infant, the heavy then low character of frequency of infant; 3) compare the character that the frequency of the rocking chair that the radius of curvature of bend is little is low with the big rocking chair of the radius of curvature of bend.
Promptly, rocking chair of the present invention (1) solves described problem by following manner, this mode is: in the rocking-chair for infantile (1) that possesses a portion (7) and foot (5), the radius of curvature of described rearward end is set at the radius of curvature greater than described pars intermedia, wherein, described seat portion (7) possesses the seat (2) with the state mounting infant who supports the back, and described foot (5) links with described seat portion (7) and is provided with the bend that extends to rearward end from pars intermedia.
When rocking-chair for infantile has low infant of monthly age in mounting, the pars intermedia ground connection of foot, but under the situation of rocking-chair for infantile of the present invention, because the radius of curvature of this pars intermedia is little, so even the light infant of body weight, frequency is also little.On the other hand, when mounting has high infant of monthly age, because center of gravity is in the rear, so bend is rearward end ground connection.At this moment, the radius of curvature of this rearward end is big, but because heavyweight vehicle, so frequency can be too not high.And because the little part of radius of curvature only is a pars intermedia, the radius of curvature of rear end is big, so can not destroy the balance of rocking chair integral body, in addition, the angle of shaking can be not excessive, and rocking chair is difficult for falling down along front and back.
And, the rocking chair of the manner (1) solves described problem by following manner, when promptly among the infant of the body weight in the scope of application with rocking-chair for infantile (1), that body weight is light infant uses, part (30b) ground connection that the radius of curvature of described bend (30) is little, when the infant of heavyweight vehicle uses, part (30c) ground connection that the radius of curvature of described bend (30) is big.Like this, even the light infant of body weight uses, because the little partial earthing of radius of curvature, so frequency is constant big, when the infant of heavyweight vehicle used, radius of curvature was big, but because heavyweight vehicle, so frequency does not uprise.
And in a mode of rocking chair of the present invention (1), described bend (30) also can possess: be positioned at described pars intermedia and have the part (30b) of the 1st radius of curvature; Be positioned at described rearward end and have the part (30c) of 2nd radius of curvature bigger than described the 1st radius of curvature.Constitute with two parts if so, then make easily.
And then described foot (5) also can have straight line portion (30a) at leading section.At this moment,, straight line portion and floor are joined if rocking chair is forwards tilted, the fixing rear of rocking chair, then can be firmly fixing rocking chair.
Also have, in the above description,, in bracket, have the reference symbol of accompanying drawing, but therefore the present invention is not confined to illustrated mode in order to understand the present invention easily.
(invention effect)
According to the present invention of above explanation, even can provide a kind of mounting neonate to wait the infant that health is little and body weight is light, the rocking chair that frequency also can not uprise.And, because the bending of foot is not excessive,, and can in the scope that suitably tilts, shake so the balance of rocking chair integral body is not destroyed yet.Therefore, enough 1 rocking chairs of energy provide comfortable shaking to the infant at relative broad range monthly age.
Description of drawings
Fig. 1 is the side view of the rocking chair of a mode of the present invention.
Fig. 2 is the vertical view of rocking chair shown in Figure 1.
Fig. 3 is the front view of the rocking chair 1 shown in Fig. 1.
Fig. 4 (a) is the figure of the user mode of the rocking chair of expression mounting when low infant of monthly age is arranged, and Fig. 4 (b) is the figure of the user mode of the rocking chair of expression mounting when high infant of monthly age is arranged.
Fig. 5 (a) is the figure that make state down user mode that rocking chair lie down of expression mounting when low infant of monthly age is arranged, and Fig. 5 (b) is the figure that makes the user mode under the state that rocking chair lies down when representing that mounting has high infant of monthly age.
Symbol description
1 rocking chair
2
3 frameworks
4 floor
5 foots
30b the 1st bend (bend)
30c the 2nd bend (bend)
C1, C1 ', C2, C2 ' position of centre of gravity
P1, P1 ', P2, on P2 ' equilbrium position with the contact point of floor
The specific embodiment
Fig. 1 is the side view of the rocking chair 1 of a mode of the present invention, and Fig. 2 is the vertical view of rocking chair 1 shown in Figure 1, and Fig. 3 is the front view of rocking chair 1 shown in Figure 1.
This rocking chair 1 is with from the infant at low paramount monthly age at the monthly age rocking chair 1 as object.Rocking chair 1 has: seat portion 7, and it comprises the seat 2 with the state mounting infant who supports the back; Framework 3, it is positioned at seat 2 top, and surround seat 2 around; Foot 5, it disposes present 2 belows, and contacts with floor 4.
Seat 2 has the seat 10 that supports infant's lower part of the body and backrest 11, two and the person who supports the upper part of the body connects to cross section " く " word shape.And, even the front end 12 at seat 10 is crooked downwards smoothly in the mode that infant's pin is in contact with it also not bitterly.
The framework 3 of the top of seat 2 as shown in Figure 1, is seen linearly by cylinder part being bent to form for oval shape constitutes from the side.The front portion 15 of framework 3 links with the front end of seat 2 12, and the rear portion 16 of framework 3 extends to the top of the rear end 13 of seat 2.When reality is used, cover the fabric cover (not shown) of softness on present 2 with resiliency.End at this cover forms bag portion, inserts by framework 3 and leads in this bag portion, and seat 2 and framework 3 are linked.
Be fixed with binding parts 20 in the both sides 17 of framework 3, angle adjustment parts 21 link parts 20 from this and extend.These angle adjustment parts 21 are by base 22 and two cylinder parts that are bent into " コ " font that side 23 forms, and the two ends 24 of two sides 23 are bending to the inside further.Then, insert binding parts 20 by the two ends 24 that will bend, angle adjustment parts 21 can be installed on the framework 3 with moving pivotally.
As shown in Figure 2, foot 5 has: U word portion 30, and it is formed by cylinder part; Front shroud 33, it is installed in the place ahead of this U word portion 30, and forwardly has recess 31, has protrusion 32 in central authorities.And as shown in Figure 1, when observing from the side, U word portion 30 has line part 30a at the leading section from the continuous foot 5 of front shroud 33.And, also have: the 1st bend 30b that has the 1st radius of curvature at pars intermedia from the continuous foot 5 of this straight line portion 30a; The 2nd bend 30c that has 2nd radius of curvature bigger in rearward end than the 1st radius of curvature from the continuous foot 5 of the 1st bend 30b.
The side view of the rocking chair 1 of the 1st equilbrium position when Fig. 4 (a) is infant (not shown) about suitable, the about 3kg of minimum body weight infant in the rocking chair 1 of the manner is uploaded the scope of application that is equipped with this rocking chair 1.As shown in the figure, in the 1st equilbrium position, the 1st bend 30b is positioned at the prescribed limit that comprises the some P1 that U word portion 30 and floor 4 join.And the position of centre of gravity C1 of the integral body of infant and rocking chair 1 is positioned on the straight line of drawing to vertical top from this P1.
The side view of the rocking chair 1 of the 2nd equilbrium position when Fig. 4 (b) is infant (not shown) about suitable, the about 10kg of weight limit infant in the rocking chair 1 of the manner is uploaded the scope of application that is equipped with this rocking chair 1.As shown in the figure, in the 2nd equilbrium position, the 2nd bend 30c is positioned at the prescribed limit that comprises the some P2 that U word portion 30 and floor 4 join.And the position of centre of gravity C2 of the integral body of infant and rocking chair 1 is positioned on the straight line of drawing to vertical top from a P2.
And, here, minimum body weight in the scope of application of rocking chair 1 is the body weight of hypothesis neonate when being about 3kg, the body weight of weight limit is the body weight of infant when being about the 10kg left and right sides at 12 months monthly ages of hypothesis, but be not limited thereto, under different situation of object monthly age or age, minimum body weight also is different with weight limit.
Get back to Fig. 1, on the 1st bend 30b of foot 5 both sides, be separately installed with the 1st gomphosis part 40 on the base 22 that can embed angle adjustment parts 21.And, on the 2nd bend 30c, the 2nd gomphosis part 41 on the base 22 that can embed angle adjustment parts 21 is installed equally.And, embed in the 1st gomphosis parts 40 or the 2nd gomphosis part 41 any by base 22 angle adjustment parts 21, can be with respect to foot 5 with predetermined angular fixed frame 3 and even seat 2.
The place ahead that is fixed with the position that links parts 20 in the both sides 17 of framework 3, be fixed with an end 46 of the bonded block 45 that 1 bar-like member by bending constitutes respectively, the other end 47 of this bonded block 45 inserts and is fixed in the hole 35 that the sidepiece at the protrusion 31 of front shroud 33 is provided with.
And, the rear in foot 5, the fixed part 50 of " コ " font that is formed by bar-like member is fixed with the state that its two ends pivot ends in foot 5.
Then, use the situation of rocking chair 1 of the state of Fig. 1 to describe to the infant of about 3kg.And in use, described cover (not shown) is installed on present 2.
At first, make fixed part 50 rotation at the rear of foot 5, make fixed part 50 rotate to the top of foot 5, the long limit of fixed part 50 is positioned in the rear portion of foot 5 from the state of Fig. 1 along the clockwise direction the figure, remove the fixing of rocking chair 1, become the state that can shake.
Then, on infant's mounting present 2, because the infant's of about 3kg health is little, the position of buttocks and center of gravity is near, so shown in Fig. 4 (a), the center of gravity that infant and rocking chair 1 are matched also is positioned at the position C1 that not too departs from seat 10.Then, under this state, rocking chair 1 in the 1st bend 30b some P1 and the position that joins of floor 4 on keep balance.If shake rocking chair 1 under this state, then rocking chair 1 is that the center is shaken with the frequency of regulation with a P1.And, when the frequency of practical measurement this moment, be about 60 times in 1 minute.This value is suitable frequency for the neonate.
Then, shake stopping, fixedly the situation of rocking chair 1, as shown in fig. 1, the fixed part of mounting on the rear portion of U word portion 30 is rotated counterclockwise, lifts the rear of U word portion 30, the vertical component effect 30a of foot 5 is contacted with floor 4 with front shroud 33, and fixing by fixed part 50.At this moment, because the vertical component effect 30a in the place ahead of foot 5 and front shroud 33 are linearly, so fixing easily.
Then, use the situation of rocking chair 1 of the state of Fig. 1 to describe to the infant of about 10kg.Also install described cover (not shown) on present 2 this moment.
At first, identical with the infant's of described 3kg situation, the fixed part 50 at the rear of foot 5 is turned clockwise in the drawings from the state of Fig. 1, make fixed part 50 rotate to the top of foot 5, the long limit of fixed part 50 is positioned in the rear portion of foot 5, remove the fixing of rocking chair 1, become the state that can shake.
Then, on infant's mounting present 2, because compare with infant about 3kg, the health of the infant about 10kg is big, so shown in Fig. 4 (b), the center of gravity that infant and rocking chair 1 are matched is arranged in the position of the figure C2 that departs from seat 10.Then, under this state, rocking chair 1 in the 2nd bend 30c some P2 and the position that joins of floor on keep balance.If shake rocking chair 1 under this state, then rocking chair 1 is that the center is shaken with a P2.And because compare with the 1st radius of curvature of a P1, the 2nd radius of curvature of this P2 is big, thus be that the situation that the center is shaken is compared with P1, it is big that frequency becomes.And when the frequency of practical measurement this moment, 1 minute frequency is about 86 times.When this frequency is higher than mounting infant about described 3kg is arranged 60 times are suitable frequencies for about 12 months infants.And though not shown, under the situation of the infant about 8kg, frequency is 75 times/minute.
Fig. 5 (a) and Fig. 5 (b) are the side views of the rocking chair 1 when being illustrated in the rocking chair 1 that uses the manner under the state that the infant is further lain down.At first, in the rocking chair of the state of Fig. 1, take off angle adjustment parts 21, embed the 2nd gomphosis part 41 that is positioned at the 1st gomphosis part 40 rears from the 1st gomphosis part 40.Thereby framework 3 falls down to the direction of foot 5, and seat 2 maintains the state of further lying down.Like this, the angle that can change seat 2 with easy operation and infant's preference or state with matching.
And at this moment, the position that foot 5 and floor 4 are joined is according to infant's body weight and different.For body weight is infant about 3kg, and center of gravity is arranged in not too the position of the figure C1 ' that departs from seat 10, so shown in Fig. 5 (a), the foot 5 on the equilbrium position and the contact of floor 4 are the some P1 ' in the 1st bend 30b.And the position of the C1 shown in the position of C1 ' and Fig. 4 (a) is slightly different, but because the 1st bend 30b has width to a certain degree, so P1 ' is also contained among the 1st bend 30b.And rocking chair is that the center is shaken with the frequency of regulation with this P1 '.
And, for the infant about body weight 10kg, because center of gravity is arranged in the position of the figure C2 ' that departs from seat 10, so shown in Fig. 5 (b), the foot 5 on the equilbrium position and the contact of floor 4 are the some P2 ' in the 2nd bend 30c.And the position of C2 ' is also slightly different with the position of the C2 shown in Fig. 4 (b), but because the 2nd bend 30c also has width to a certain degree, so P2 ' is also contained among the 2nd bend 30c.And rocking chair is that the center is shaken with this P2 ' because the 2nd radius of curvature is bigger than the 1st radius of curvature, so be that the situation that the center is shaken is compared frequency gets higher with P1 '.
More than, according to the rocking chair of the manner, because when mounting had low infant of monthly age, the radius of curvature of the pars intermedia that bend and floor join was little, so even infant's body weight is light, frequency is also less.On the other hand, when mounting has high infant of monthly age, because center of gravity in the wings, so bend contacts with the floor in rearward end.At this moment, the radius of curvature of this rearward end is big, but because heavyweight vehicle, so frequency does not uprise.And the part that radius of curvature is little only is a pars intermedia, and the radius of curvature of rearward end is big, so the balance of rocking chair integral body can not destroyed, and waving angle can be not excessive, and rocking chair is difficult for falling down along front and back.Therefore, enough 1 rocking chairs of energy provide optimum shaking to the infant at wide region monthly age.
And the present invention is not limited to described mode, can implement in every way.For example, also foot can be directly installed on the seat.And the radius of curvature of circular arc can not be a two-stage also, but along with the radius of curvature that increases towards the rear and gradually.

Claims (4)

1. rocking-chair for infantile, it possesses a portion and foot, and described seat portion possesses the seat with the state mounting infant who supports the back, and described foot is with described seat portion's binding and be provided with the bend that extends to rearward end from pars intermedia, described rocking-chair for infantile is characterised in that
The radius of curvature of described rearward end is set at the radius of curvature greater than described pars intermedia.
2. rocking-chair for infantile according to claim 1 is characterized in that,
When infant among the infant of the body weight in having the scope of application of described rocking-chair for infantile, that body weight is light uses, the partial earthing that the radius of curvature of described bend is little, when the infant of heavyweight vehicle uses, the partial earthing that the radius of curvature of described bend is big.
3. rocking-chair for infantile according to claim 1 and 2 is characterized in that,
Described bend possesses: be positioned at described pars intermedia and have the part of the 1st radius of curvature; Be positioned at described rearward end and have the part of 2nd radius of curvature bigger than described the 1st radius of curvature.
4. according to each described rocking-chair for infantile in the claim 1~3, it is characterized in that,
Described foot has straight line portion at leading section.
CN200610064113.3A 2005-12-26 2006-12-14 Rocking-chair for infantile Expired - Fee Related CN1989878B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2005371770A JP2007167503A (en) 2005-12-26 2005-12-26 Rocking chair for infant
JP2005371770 2005-12-26
JP2005-371770 2005-12-26

Publications (2)

Publication Number Publication Date
CN1989878A true CN1989878A (en) 2007-07-04
CN1989878B CN1989878B (en) 2010-11-03

Family

ID=38212584

Family Applications (1)

Application Number Title Priority Date Filing Date
CN200610064113.3A Expired - Fee Related CN1989878B (en) 2005-12-26 2006-12-14 Rocking-chair for infantile

Country Status (2)

Country Link
JP (1) JP2007167503A (en)
CN (1) CN1989878B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101254054B (en) * 2008-02-05 2010-06-02 明门实业股份有限公司 Baby's swing seat
CN103767373A (en) * 2012-10-22 2014-05-07 戴永锋 Multidirectional rotary swing chair with swing amplitude limit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011056111A (en) * 2009-09-11 2011-03-24 Bijisaa:Kk Rocking chair
EP4277499A1 (en) * 2021-01-15 2023-11-22 Kids2, Inc. Convertible children's seat

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29900156U1 (en) * 1999-01-08 1999-04-15 Schroeder Jonathan Three position chair
CN2512335Y (en) * 2001-12-17 2002-09-25 中山隆顺日用制品有限公司 Divided folding structure of baby rocking chair

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101254054B (en) * 2008-02-05 2010-06-02 明门实业股份有限公司 Baby's swing seat
CN103767373A (en) * 2012-10-22 2014-05-07 戴永锋 Multidirectional rotary swing chair with swing amplitude limit

Also Published As

Publication number Publication date
CN1989878B (en) 2010-11-03
JP2007167503A (en) 2007-07-05

Similar Documents

Publication Publication Date Title
US7213277B1 (en) Rocking bed
CN1750777A (en) Chair, especially an office or work chair
JP3103304B2 (en) Chair tilting method and chair with tiltable back
CN1989878A (en) Rocking-chair for infantile
CN1676061A (en) Seat for a child
CN111067293A (en) Chair with foot rest
JP4792234B2 (en) Chair
CN111053390A (en) Chair with detachable top
CN1676063A (en) Seat or chair for infant
CN1561173A (en) Removable anatomic seat
CN216364375U (en) Seat with electric lifting function
JP5635573B2 (en) Chair
CA2655276C (en) Chair having support base
CN111096594A (en) Chair and footrest subassembly thereof
CN219645350U (en) Seat tool
CN1644193A (en) Massaging device
CN2738767Y (en) Pressure-reducing seat cushion
CN215533053U (en) Seat and position adjusting device of backrest thereof
CN211722455U (en) Chair rack
CN211933363U (en) Chair and footrest subassembly thereof
CN211212189U (en) Portable rocking chair
CN211933364U (en) Chair with foot rest
KR101326564B1 (en) an attachable and detachable shelf for chairs and the chair using thereof
KR200455757Y1 (en) Posture chair
CN211722474U (en) Chair frame

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20101103

Termination date: 20161214

CF01 Termination of patent right due to non-payment of annual fee