Stretching device for leisure chair
A stretching device for a leisure chair includes a base. Stretching assemblies are symmetrically and pivotally connected to two sides of the base. The stretching assembly includes a seat plate mechanism. The front part of the seat plate mechanism is pivotally connected to a leg mechanism. The rear part of the seat plate mechanism is pivotally connected to a backrest mechanism. A drive mechanism is provided between the stretching assemblies. The drive mechanism includes a front drive rod and a rear drive rod. The front drive rod and the rear drive rod drive the stretching assemblies to unfold or fold by a reciprocating motion device. Two ends of the front drive rod are fixedly connected to the leg mechanism. Two ends of the rear drive rod are pivotally connected to a first drive member. The middle part of the first drive member is pivotally connected to a second drive member.
1. A stretching device for a leisure chair, comprising
a base, wherein
stretching assemblies are symmetrically and pivotally connected to two sides of the base;
each of the stretching assemblies comprises a seat plate mechanism, a leg mechanism and a backrest mechanism, wherein a front part of the seat plate mechanism is pivotally connected to the leg mechanism, and a rear part of the seat plate mechanism is pivotally connected to the backrest mechanism;
a drive mechanism is provided between the stretching assemblies;
the drive mechanism comprises a front drive rod and a rear drive rod;
the front drive rod and the rear drive rod drive the stretching assemblies to unfold or fold by a reciprocating motion device;
two ends of the front drive rod are fixedly connected to a leg mechanism of each of the stretching assemblies;
two ends of the rear drive rod are pivotally connected to a first drive member;
a middle part of the first drive member is pivotally connected to a second drive member;
one end of the first drive member and one end of the second drive member are pivotally connected to the seat plate mechanism;
the first drive member is fixedly connected to a first limit pin;
the rear drive rod is provided with an arcuate-slotted hole, and
the first limit pin slides through the arcuate-slotted hole.
2. The stretching device according to claim 1 , wherein
the base comprises a base frame;
mounting frames are fixedly connected to two sides of the base frame; and
each of the mounting frames are configured to pivotally connect to a respective one of the seat plate mechanisms.
3. The stretching device according to claim 2 , wherein
the seat plate mechanism comprises a first front rotating member and a first rear rotating member;
a first end of the first front rotating member is pivotally connected to a front part of a respective one of the mounting frames, and a first end of the first rear rotating member is pivotally connected to a rear part of a respective one of the mounting frames;
a second end of the first front rotating member and a second end of the first rear rotating member are pivotally connected to a respective first side link rod;
a front part of the respective first side link rod is pivotally connected to a respective second front rotating member;
a middle inner side of the respective second front rotating member is pivotally connected to the first drive member, and a middle outer side of the respective second front rotating member is pivotally connected to a respective side assembly plate;
a middle part of the respective first side link rod is pivotally connected to the second drive member;
a rear part of the respective first side link rod is pivotally connected to a first end of a respective second rear rotating member;
a second end of the respective second rear rotating member is pivotally connected to a respective second side link rod;
a footrest connected to the leg mechanisms of the stretching assemblies;
the footrest is pivotally connected to a first end of a first leg link rod and a first end of a second leg link rod;
a second end of the first leg link rod is pivotally connected to a first end of a third leg link rod, and a second end of the second leg link rod is pivotally connected to a first end of a fourth leg link rod;
a second end of the third leg link rod and a second end of the fourth leg link rod are pivotally connected to a front part of the side assembly plate;
a rear part of the second leg link rod is pivotally connected to a front part of the second leg link rod;
a rear part of the fourth leg link rod is pivotally connected to a front end of the respective second side link rod;
each backrest mechanism of the stretching assemblies comprises a backrest mounting plate;
a front end of each of the backrest mounting plates is pivotally connected to the respective second front rotating member;
a middle front part of each of the backrest mounting plates is pivotally connected to the respective side assembly plate, and a middle part of each of the backrest mounting plates is pivotally connected to a respective backrest rotating member;
the backrest rotating member is pivotally connected to a first end of a backrest drive member;
a second end of the backrest drive member is pivotally connected to a rear end of the respective first side link rod; and
one end of the backrest rotating member is pivotally connected to a rear end of the respective second side link rod.
4. The stretching device according to claim 3 , wherein
a tension spring is provided between the respective second front rotating member and the rear drive rod.
5. The stretching device according to claim 1 , wherein
the reciprocating motion device comprises a motor hinged to the front drive rod;
the motor drives a sliding block to slide on a sliding rail; and
the sliding block is fixedly connected to the rear drive rod.