Adjustable chair frame backrest

Abstract

The utility model relates to an adjustable chair frame backrest, which is used for a dentist chair and is provided with a bent plate, guide holes bent in an arc shape from back to front are arranged on the left side and the right side of a chair frame, sliders are mounted on the outer side surfaces of the left side and the right side of the chair frame and are opposite to the guide holes, and guide heads are fixed above the rear ends of the inner side surfaces of the left side and the right side of the chair frame. A sliding groove is formed in the inner side face of the guide head, the left side and the right side of the bent plate are embedded into the sliding groove of the guide head respectively, the top end of the bent plate is connected with the bottom end of the backrest, the left side and the right side of the bottom end of the bent plate are connected with the sliding blocks through connecting rods respectively, the connector is hinged to the middle of the bottom end of the bent plate, and the driving motor is installed in the middle of the front end of the chair frame. A rotating shaft of the driving motor is connected with the connector through threads. The dentist chair has the advantages of being simple in structure, stable and safe in work and fast to adjust, and the backrest of the dentist chair can be fast adjusted to the comfortable position of a patient according to the height of the patient.

Description

Technical Field

[0001] The utility model relates to an adjustable chair frame backrest, in particular to an adjusting device which can adjust the height and the inclination of the chair backrest simultaneously through a bent plate. Background Art

[0002] Currently, the traditional way to adjust the backrest of a dental chair on the market is to adjust the headrest up and down manually or electrically. This adjustment method requires the patient to move their body and head to cooperate with the adjustment. This method is inconvenient to operate and causes trouble and discomfort to the patient. Utility Model Content

[0003] The purpose of the utility model is to provide an adjustable chair frame backrest, which drives a bending plate through a driving motor to adjust the chair backrest, so as to more quickly and comfortably adjust the chair backrest to a sitting posture suitable for the patient's height.

[0004] The technical solution of the present invention is based on a chair frame, a connecting plate, a slider, a connecting head, a driving motor and a backrest, and is characterized by a bent plate, guide holes curved in an arc shape from back to front are provided on the left and right sides of the chair frame, the sliders are installed on the left and right outer side surfaces of the chair frame opposite to the positions of the guide holes, guide heads are fixed above the rear ends of the inner side surfaces of the left and right sides of the chair frame, a sliding groove is provided on the inner side surfaces of the guide heads, the left and right sides of the bent plate are respectively embedded in the sliding grooves of the guide heads for installation, the top end of the bent plate is connected to the bottom end of the backrest, the left and right sides of the bottom end of the bent plate are respectively connected to the sliders installed on the left and right outer side surfaces of the chair frame through connecting rods passing through the guide holes, the connecting head is hingedly installed in the middle of the bottom end of the bent plate, the driving motor is installed in the middle of the front end of the chair frame, and the rotating shaft of the driving motor is connected to the connecting head through a thread.

[0005] The forward and reverse rotation of the rotating shaft of the driving motor of the utility model can drive the bent plate to slide forward and backward along the guide hole through the connecting head, and at the same time force the backrest to adjust the height and inclination.

[0006] The working principle of the utility model is to drive the curved plate to slide along the guide hole through a driving motor, so as to achieve quick adjustment of the backrest. After the patient lies on the chair, when the backrest is lowered to the lowest position, the patient's head will not move. When the backrest is raised to the highest position, the patient's back will not feel pushed or pressed, which can make the patient feel convenient and comfortable.

[0007] The utility model has the advantages of simple structure, stable and safe operation, and quick adjustment. The utility model can quickly adjust the backrest of the dentist's chair according to the patient's height to a comfortable position for the patient. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the utility model;

[0009] Figure 2 This is a schematic diagram of the utility model's backrest adjustment structure;

[0010] Figure 3 It is a schematic diagram of the overall three-dimensional structure of the utility model from another perspective. DETAILED DESCRIPTION

[0011] according to Figure 1 、 Figure 2 、 Figure 3 As shown, the utility model is based on a chair frame 1, a connecting plate 2, a slider 4, a connecting head 6, a drive motor 7, a backrest 8, and a connecting plate 2 installed at the front end of the chair frame 1. It is characterized by a bent plate 3, and guide holes are provided on the left and right sides of the chair frame 1 that are curved from back to front. The slider 4 is installed on the left and right outer sides of the chair frame opposite to the position of the guide holes. A guide head 5 is fixed above the rear end of the inner side of the left and right sides of the chair frame 1, and a concave-shaped slide groove is provided on the inner side of the guide head 5. The left and right sides of the bent plate 3 are respectively embedded in the slide groove of the guide head for installation. The top of the bent plate 3 is connected to the bottom end of the backrest 8, and the left and right sides of the bottom end of the bent plate 3 are respectively connected to the slider 4 installed on the left and right outer sides of the chair frame through a connecting rod passing through the guide hole. The connecting head 6 is hingedly installed in the middle of the bottom end of the bent plate 3, and the drive motor 7 is installed in the middle of the front end of the chair frame 1. The rotating shaft of the drive motor 7 is connected to the connecting head 6 through a thread. The forward and reverse rotation of the rotating shaft of the driving motor 7 can drive the curved plate to slide forward and backward along the guide hole through the connecting head 6, and at the same time force the backrest 8 to adjust the height and inclination. When the patient sits on the dental chair cushion, with his back leaning on the dental chair backrest and his head leaning on the dental chair pillow, the dental chair pillow can be adjusted up and down according to the height of the patient. Press the backrest button on the control circuit board, and the driving motor of the backrest rotates. Since the backrest and headrest are installed on the backrest curved plate, the driving motor drives the backrest to move downward to a different angle when it rotates. During this movement, the patient's head always remains unchanged, which truly solves the application of ergonomics in the industry.

Claims

1. An adjustable chair frame backrest, comprising a chair frame, a connecting plate, a slider, a connector, a drive motor, and a backrest, characterized in that: There is a bent plate, and guide holes curved from back to front are provided on the left and right sides of the chair frame. The sliders are installed on the left and right outer sides of the chair frame opposite to the guide holes. Guide heads are fixed above the rear ends of the inner sides of the left and right sides of the chair frame, and slide grooves are provided on the inner sides of the guide heads. The left and right sides of the bent plate are respectively embedded in the slide grooves of the guide heads for installation. The top of the bent plate is connected to the bottom end of the backrest, and the left and right sides of the bottom end of the bent plate are respectively connected to the sliders installed on the left and right outer sides of the chair frame through connecting rods passing through the guide holes. The connecting head is hingedly installed in the middle of the bottom end of the bent plate, and the drive motor is installed in the middle of the front end of the chair frame. The rotating shaft of the drive motor is connected to the connecting head through a thread.

2. The adjustable chair backrest according to claim 1, characterized in that The forward and reverse rotation of the rotating shaft of the driving motor can drive the bent plate to slide forward and backward along the guide hole through the connecting head, and at the same time force the backrest to adjust the height and inclination.

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