Patent Application
20210022508
This invention relates to a horizontal-moving & rocking appliance for rocking chairs. The appliance is especially fitted for common chairs, realizing backward movement of load center to generate rocking function.
Conventional rocking chairs feature curved ground pieces for support and smooth rocking. However, these curved pieces often extend beyond the load center for safety reasons and rocking chairs are always unstable suited only for casual occasions. To this end, people in the industry have also made various improvements in order to make a rocking chair that has a smaller size and that is relatively stable and controllable.
For example, patent 201620946307.5 shows a dual-purpose chair with four legs. Two legs at the bottom of each side are connected together as a rocking piece, at center of which comes a connecting seat, namely, the swinging pivot. A supporting piece joints into this swinging pivot and extends backward to the ground. A resilience piece is hinged between rear end of supporting piece and mid-upper part of rear legs or back of chair and can be compressed when its load center moves backwards or the human body leans back. At this point, the chair will move backward around swinging pivot and the front legs will move upwardly to leave the ground; The counter force will increase gradually while pressure is applied to the resilient piece to the limit. With people's forward thought, the rocking chair will move forward and bounce back to its original position under elastic force. Under control of human thought, the front legs extend down to the ground and the resilient piece compresses to the limit make chair rocking back and forth. Additionally, the rocking chair remains stable because of the slightly forward load center after being seated. This also has the advantage of a dual-purpose chair.
An objective of this invention is to design a horizontal moving and rocking device, which, with two rollers positioned eccentrically in the middle and rear of the ground pieces, enables horizontal motion of ground pieces as well as makes ground pieces follow the rollers for eccentric rocking, and a design of a rocking chair with this device.
The technical proposal of the invention is achieved in one or more of the following ways:
A horizontal moving and rocking appliance features:
Ground pieces to carry load;
Mid roller positioned eccentrically at mid of ground pieces as swinging fulcrum;
Rear roller positioned eccentrically at rear of ground pieces as rear fulcrum;
Synchronous linking rod articulated between the mid and the rear rollers to maintain two rollers working synchronously.
In stationary state, positioning shaft of mid roller is located at forward rolling lower position and that of rear roller at backward rolling higher position, these 2 positions together with fore-end of ground piece form 3 ground points;
In motion state, the load center of ground pieces will move backward with load, mid roller will move forward at higher position to form a swinging fulcrum while rear roller will move backward at lower position, at the same time, rear-end of ground piece settles and fore-end tilts up; So, ground pieces will follow load center of load to move back and forth horizontally and rock around mid rollers.
Synchronous rods are connected to the same sides of mid and rear rollers by means of articulation, and rods with limit gears on them work together to limit travel distance of mid and rear rollers.
The limit gears can be one of the following: 1) mid and rear rollers feature indented sides and synchronous rods hinged to lower position side can be stopped by indented sides when in relative rotation; and 2) to lock up the synchronous rods or to stop the synchronous rods with the aid of extruded pins formed on sides of both mid and rear roller.
Installed in between mid rollers and ground pieces are reset springs that constantly bias mid rollers to move towards lower position.
The reset spring is a torsion spring, sleeved on a positioning shaft between the mid rollers and the grounding pieces, and can sink into the recessed space on the sides of mid rollers.
A horizontal moving & rocking chair includes one or more of the above-mentioned horizontal moving & rocking appliance and chair, featuring that at both sides of the chair, at least the fore-legs are fixed to the front ends of ground pieces and both sides of the ground pieces are in parallel; the designed load center of the chair locates within 100 mm before mid rollers while the space is over 50 mm in between mid and rear rollers.
The ground pieces are formed by bending the fore-legs backward and being a part of the same side.
The rear legs or the back side supporting pieces are hinged on the ground pieces before the rear rollers.
The ground pieces are formed by bending the fore-legs backward and being a part of the same side; and both sides of ground pieces are connected together at rear ends.
The fore and rear legs are fixed on the respective fore and rear ends of the corresponding ground pieces and the fore or rear ends of the ground pieces are connected together, or the ground pieces at both sides are a complete whole piece bent into U-shape.
This invention features ingenious design, simple structure, reasonable design and easy rocking, in particular, the ground pieces utilize three-point support, and load center faces forward when seated so that the chair is in a stable state, keeping your sitting posture dignified and conforming to a business environment; the consciously stepping makes people's weight move backwards so that the supporting points at fore end of the ground pieces are suspended, the mid and rear rollers move backwards synchronously. In this way, the chair is able to horizontally move backwards and then rocks up and down. The chair enjoys two states.
Similar reference characters denote corresponding features consistently throughout the attached drawings. Namely, in the drawings the following reference numbers refer to the following part:
This application refers to “rolling forward at higher and lower positions, rolling backward at higher and lower positions”, the explanation of which is as follows: due to eccentric rolling motion a rocking chair is in an unstable state when an eccentric positioning shaft is right above roller center and tends to move forward; so this tendency is referred to as “rolling forward.” When eccentric positioning shaft tends to move backward, it is referred to as “rolling backward.” Hereinunder, the “higher position” is relative to the “lower position”, referring to the height of eccentric positioning shaft relative to the roller center, and used to express if the rolling tendency is from a higher position to a lower position and vice versa. As shown in
In motion, ground piece 1 moves backwards along with the load center. More precisely, when load center shifts to mid roller 2, the mid roller 2 rotates forward at a higher position to form a swing fulcrum while rear roller 3 rotates backward at a lower position so that rear end of ground piece 1 settles and fore end tilts up to realize backward moving plus rocking motion, and ground piece 1 moves horizontally back and forth following movement of the load center. Moving backwards to limit position as shown in
Synchronous link rod functions to restrain travel distance in addition to synchronizing the pace of mid roller 2 and rear roller 3. Synchronous rod 3 is connected to the same sides of mid roller 2 and rear roller 3 by means of articulation, and the rod 4 works together with limit gear on it to restrain travel distance of mid roller 2 and rear roller 3. The limit gears can be one of the following: 1) mid roller 2 and rear roller 3 feature indented sides and synchronous rod 4 hinged to a lower position side can be stopped by indented side 21 when in relative rotation; and 2) to lock up the synchronous rod or to stop synchronous rod with the aid of extruded pins formed on sides of both mid roller 2 and rear roller 3, namely, to have the same function by use of a pin or screw fixed on the side.
In addition, a reset spring 5 is fixed in between mid roller 2 and ground piece 1 to retain mid roller's 2 tendency of rolling towards a lower position, in this way to restore to the initial design state. In this example, the reset spring 5 is a torsion spring sleeved on positioning shaft 11 between mid roller 2 and ground piece 1, and can settle into recessed space 22 on side of mid roller 2 without affecting its look. Also, a tension spring may be used. In addition, the same reset spring may be provided between rear roller 3 and ground piece 1 as needed to increase restoring force.
The aforesaid horizontal moving & rocking appliance may be installed in chairs to take advantage of this function. Based on different functions and construction of chair 6 itself, the horizontal moving & rocking appliance can be integrated into chairs for an integrated design, or mechanically added, so that chair enjoys horizontal moving & rocking function. Typical application examples are as follows.
A horizontal moving & rocking chair includes a horizontal moving & rocking appliance and chair 6, featuring that at both sides of the chair, at least fore-legs 61 are fixed to the fore ends of ground pieces 1 and both sides of the ground pieces are in parallel; the designed load center of chair 6 locates within 100 mm before mid rollers 2 while the space is over 50 mm in between mid roller 2 and rear roller 3.
As shown in
This illustration is designed to show that horizontal moving & rocking appliance are applicable to all types of chairs, as long as the chair has four legs or has two connected sides, it can be mechanically placed on the frame combined with horizontal moving & rocking appliance, or design of horizontal moving & rocking appliance can be integrated as a part of support at both sides of the chair. In this way, it is able to realize both functions of stable seating and rocking motion, so that business and leisure are both possible.
