CN1903697A - Electric lifting device - Google Patents

Abstract

An electric lift device. The device is attached to an existing bed frame and is suspended below the bed above the floor. When in use, the device lifts and secures the bed at the appropriate height to facilitate bed preparation and lowers the bed when the process is completed. The device uses an electric motor to drive a screw and scissor assembly that automatically raises and lowers the bed. The scissor assembly includes two sets of X-shaped legs connected at a central intersection and mounted on the frame and friction rollers that lock into the frame slide. The scissor assembly is driven by a starter screw that raises or lowers the device. The motor is used to operate the raising and lowering of the bed through a key switch or infrared remote control, and is used to adjust the final raised height of the bed to suit each worker. Adjustable extension tracks allow the lift device to accommodate any size bed frame, from a double bed measuring 965.2 by 1905 cm to a king bed measuring 1930.4 by 2032 cm.

Description

An electric lifting device

Technical field

The invention relates to an electric lifting device, which belongs to the field of machinery.

Background technique

The present invention relates to the ability to raise a bed to any set height, enabling a person to easily make the bed while standing fully upright.

Of all the workers' repetitive movements, housekeepers had the highest rate of injury. One of their basic tasks is to make the bed. Housemakers typically squat and bend more than 24 times per bed to move sheets, pillow covers and comforters, and change sheets, pillows and comforters. Bending down to pull the heavy cover up and bending down to lift the cushion and tuck the sheet under both places a tense strain on the lower back. Carrying the comforter and pillow to a nearby chair or workbench, and returning the comforter and pillow once the sheets have been changed, requires repetitive strain on the back. Such repetitive labor causes tension and fatigue to build up by the end of the work day, where housekeepers typically clear 10 to 15 rooms, each usually containing two beds. Over an extended period of time, these repetitive tasks lead to chronic pain and serious injury. By raising the bed to an appropriate height for maneuvering, house organizers can avoid repetitive bending and squatting that strains the back muscles. By providing retractable comforter supports at the end of the bed, comforters, pillows and cushions can be pulled and reset easily and at will. Each device minimizes traumatic movement and reduces the labor and time required to adjust the bed.

There are more than 7 million hotel beds in North America and more than 8 million hotel beds in Europe. Numerous house organizers have been able to avoid lower back strain and unnecessary fatigue by raising the bed to an appropriate height for maneuvering.

Lower back injuries and insurance costs for workers have increased significantly in recent years. The annual cost of insurance per room rose from $248 in 2000 to more than $600 in 2005. The hotel industry is seeking to reduce such costs and make their employees live longer and healthier.

It costs a lot of money for back insurance. In 2004, workers' lower back injuries accounted for 15%-20% of compensated injuries and 35% of workers' compensation costs. Injuries to the lower back account for 30% of all injuries leading to miscarriage. The estimated economic impact is staggering, including lost productivity, associated medical costs, and lost workforce due to occupational injuries. The average cost of a worker's compensation claim related to the lower back is nearly $8,500, which is twice the cost of the average injury compensation claim.

In the United States, the estimated total annual payments range from $500 trillion to $1,000 trillion. A large portion of these costs are directly related to workers' compensation claims.

Back injuries are among the most significant and costly work-related musculoskeletal disorders in the United States. Each year, lower back pain negatively affects 1,000,000 American workers and accounts for more lost workdays than any other musculoskeletal disorder.

In 1998, more than 440,000 people were absent from work for at least 1 day due to a back injury, accounting for a quarter of all absences due to non-fatal injuries or illnesses that year. The vast majority of workers with back injuries return to work quickly, however, the small number who do not return to work quickly accounts for the bulk of the associated costs and health care. In total, people with back injuries lose an average of 6 working days per year. However, in 2004, nearly 20% of those with a back injury lost more than 31 workdays.

A quarter of all compensation claims involve back injuries, with a financial burden on the industry in the billions of dollars. This figure does not include consideration of the noxious impact on the pain, suffering and quality of life of the injured person.

It has long been recognized that workers want to position their work objects in the most suitable position for their work, for comfort, utility, and to reduce possible injury. For this reason, hydraulic lift tables are the standard tool in industry. Pallet jacks have long been used to place heavy objects in positions where back injuries can be avoided. Chronic stooping causes unnecessary fatigue and discomfort, reducing the benefits in terms of safety and career satisfaction. This risk is encountered by people who stand at work out of necessity and habit. Bending over prolonged periods of time, even lightly, if not relaxed, can lead to chronic back problems or exacerbate existing problems.

US Patent 3,472,183 issued to Robert Goodman on October 14, 1969 addresses this problem and discloses a vertically adjustable table in which a switch-controlled motor drives an internal screw jack cylinder, allowing The table is adjusted in small increments.

U.S. Patent No. 4,232,901 issued on November 11, 1980 to Allanne M. Harrington et al. discloses an adjustable ottoman in which a remote switch is connected to an electric system to rotate on two screw rods. a pair of hinges. The ottoman can be adjusted vertically to a comfortable position by means of two sets of rods fixed to the idler mechanism.

U.S. Patent 3,982,718 to Richard P. Falkenrose, issued September 28, 1976, discloses an operable chair using a pair of idler jaws and a screw adjacent to the base of the device that can be moved between The vertical direction is adjusted.

US Patent issued March 13, 1962 to Philis J. Autor et al. discloses a movable, recessable display device. The device has a wheeled base, telescoping sections that can be raised or lowered by pistons protruding from cylinders mounted on a pair of pivoted control rods. There are a pair of X-frame stabilizers on each side of the unit, with a rotating table on top to facilitate the display of cars or the like.

U.S. Patent 3,700,070 issued to John Garaby King on October 24, 1972 discloses a scissor hitch in which, when the hitch is in a fully recessed position, Above the line of action of the cylinder, the problem of requiring high starting force is overcome.

U.S. Patent 4,858,482 issued to Eric Knudson on August 22, 1989 and U.S. Patent 4,934,647 issued to James Wen S. Edwards on June 19, 1990 have all disclosed a method for lifting a workbench or multiple Scissor mechanism for mounting table.

None of the above inventions and patents, individually or in combination, disclose what is disclosed and claimed in the present invention.

Contents of the invention

In order to overcome the shortcomings of the prior art structure, the present invention provides an electric lifting device.

The technical solution adopted by the present invention to solve its technical problems is:

Includes frame, electric controller, motor, reducer, scissor assembly, screw and traveling nut. When the device is activated, the screw rotates and each scissor assembly leg is compressed into a closed position, lifting the bed from the floor to a height at which workers can tidy the bed without bending over or stooping.

The frame is composed of brackets. There are slide grooves on the inner side of the two opposite brackets. The scissors component has 4 brackets. The middle part of each two brackets is connected by a shaft to form a cross bracket that can be rotated around the shaft. Each cross bracket One end of the bracket is a leg, and the leg is connected with a roller. The other end of each bracket of the cross bracket is connected to the frame and the chute respectively. There is a connecting bracket between the two cross brackets. After the motor is connected to the reducer, it is installed in a On the connecting bracket, the output shaft of the reducer is connected to the screw rod, the screw rod is connected to the moving nut, the moving nut is fixed on the connecting bracket of another cross bracket, and the other end of the screw rod is connected to the bracket of the frame.

The screw is driven by a drive train consisting of a motor and a reducer connected to it, which is a reduction worm gear device. When the motor fails to turn the screw rod, it can be manually lowered by a handwheel or an electric drill arranged on the free input shaft of the reduction worm gear device, and the pushing device is lowered to a position where the motor can be replaced.

The drive train turns the threaded rod connected to the travel nut, manipulating the scissor assembly to raise and lower the bed frame. This movement is controlled by the operation of an electric controller, which can be a pair of foot switches, a key switch or an infrared controller. Operation of the electric controller controls the device, allowing steady, controlled movement of the bed between the raised and lowered positions. Bushings at the intersection of the scissor assemblies reduce frictional losses and smooth out motion.

It is a primary object of the present invention to provide an adjustable bed height lift which includes a powered lift which is extended and retracted by actuation and operation of its internal structure and mechanical components.

Another object of the present invention is to have a stretchable U-shaped guide rail connection at the tail of the lifting device frame, and use it to place quilts and pillows when the bed is arranged.

Another object of the present invention is to provide, at one input of the reducer, a mounting point for a manual handwheel or electric drill so that in the event of a motor failure, the bed can be lowered by hand or with an electric drill provided.

Another object of the present invention is to provide an electric motor controller that operates the raising or lowering of the lifting device through a pair of foot switches, a key switch or an infrared controller.

Another object of the present invention is to provide improved components and structures in devices to achieve the above stated objects which are cheap, safe, reliable and sufficiently effective.

These and other objects of the present invention will become more apparent upon further reading of the following description and accompanying drawings of the present invention.

Beneficial Effects of the Invention The device can lift the bed frame to any set height, enabling a person to make the bed when standing completely upright. The unit attaches to the existing bed frame when not in use and hangs from under the bed above the floor. In use, the device raises and holds the bed at the proper height for bed tidying, and lowers the bed when the process is complete. The unit uses an electric motor to drive a screw and scissor assembly that automatically raises and lowers the bed. The scissors-shaped assembly includes two sets of X-shaped legs connected at the central intersection and arranged on the frame and sliding rollers locked in the frame chute. The scissor assembly is driven by an actuator screw that raises or lowers the unit. The motors are used to manipulate the raising and lowering of the bed through key-operated switches or infrared remote control, and are used to adjust the final lifting height of the bed to suit each worker. Adjustable extension rails allow the lift to fit any size bed frame, from a 965.2 x 1905 cm (38 x 75 in) double to a 1930.4 x 2032 cm (76 x 80 in) king.

Description of drawings

The invention will be further described below with reference to the drawings and embodiments, and those skilled in the art will be more aware of the novel features and advantages of the above invention. Like reference numerals denote like parts. in

Figure 1 is a top view of a preferred embodiment of a motorized lifting device in a down/retracted position.

Figure 2 is a perspective perspective view of the electric lifting device in the down position.

Fig. 3 is an enlarged schematic view of the drive train of the electric lifting device shown in Fig. 2 .

Fig. 4 is a schematic view of the end face of the present invention in the down position.

Figure 5 is a schematic side view of the invention in the down position with the guide rails unstretched.

Figure 6 is a bottom perspective view of the invention in the down position: showing the rails, standard bed frame with headboard attached, mattress and bed drawers seated thereon, when unstretched.

Fig. 7 is a schematic diagram of the end face of the electric lifting device and the integrated bed in the down position.

Figure 8 is a transparent perspective view of the invention in the down position: showing the existing bed frame and the rails when they are not stretched.

Figure 9 is a transparent schematic view of the invention attached under a bed in the down position.

Figure 10 is a schematic side view of the invention with the bed lifted off the ground: showing the bed frame supported and the rails stretched.

Detailed ways

As shown in Figure 1, the preferred devices described herein are not intended to be exhaustive, nor to limit the invention to the precise forms disclosed. It was chosen to explain the principles of the invention and the application of the method in practice to enable others skilled in the relevant art to practice the invention.

In detail, with reference to the accompanying drawings, and in particular to accompanying drawing 1, a preferred embodiment of the electric lifting device in the retracted position is described. The electric lifting device includes a frame (1), a motor-driven scissor assembly (2), a screw-driven scissor assembly (3), a width extension arm (4), an attachment hook (5), and a scissor assembly connecting shaft pin ( 6), AC motor (7), worm gear (8), reducer (9), bearing (10), drive shaft (11), flexible shaft connector (12), moving nut (13), screw rod (14), Motor controller (15), stop nut (manually actuated in case of motor failure) (16), comforter/pillow rail (17). When the present invention is assembled to existing bed and headboard, controller (18) is contained on headboard to control the system shown in Fig. 7, and controller (18) can be infrared remote interface/key switch , the flexible shaft connector (12) connects the drive shaft (11) and the screw rod (14) of the reducer (9), and one end of the bracket of the scissor assembly (2), (3) is connected to the frame through the connecting shaft pin (6) , Another support of scissors-shaped assembly (2), (3) has sliding roller to be connected in the frame chute.

This electric lift is suspended from the existing metal bed frame beneath the bed. The four width extension arms (4) plug into the end brackets of the frame (1) and the four width extension arms (4) with attached hooks (5) can be adjusted to fit all standard, large and king sizes The standard width of the bed.

The forward or reverse motor (7) is connected to the motor controller (15) connected to the standard wall switch. When the operator inputs instructions to the controller (18), the motor controller (15) starts the system and controls the motor (7) Steering and speed. When the controller (18) manipulates the motor (7) to rotate clockwise, the electric lifting device extends downward from its closed position until it reaches the ground, and then continues to promote the bed frame and the bed to the preset position. Figure 10 depicts the electric lifting device in this "raised" position. When the motor is turned counterclockwise, the bed is lowered until it is placed just above the existing metal bed frame, while the electric lift continues to retract until the device clears the ground, allowing the bed to be moved back into the existing metal frame on casters.

A person skilled in the art can implement the switches and circuit arrangements described above in many different ways. In a preferred embodiment, the operation interface is that the controller (18) shown in FIG. 7 is a double-key switch. The double-key switch has a turntable key, and the user can turn the turntable key in one direction to make the motor (7) drive the output shaft to rotate clockwise, thereby lifting the bed. Turn the turntable key counterclockwise, and the motor (7) drives the output shaft to rotate counterclockwise, thereby lowering the bed. In a preferred embodiment, the switches and circuitry include limit switches for preventing the motor from raising the bed above a predetermined position and from retracting the motorized lifting device into a predetermined position. The retraction and extension of the electric lifting device can also be controlled similarly by remote control of the far infrared receiver.

Figure 2 illustrates the operation of the present invention. When using the electric controller (15) to lift the bed by the controller (18 shown in Figure 7), the motor (7) starts to rotate the output shaft and the screw rod (14) connected thereto clockwise. Due to the rotation of the screw (14), the moving nut (13) provided on the screw (14) moves away from the motor (7). As the nut (13) is moved away from the motor (7), the legs of the scissor assembly connected by the pivot pin (6) and moving with the reducer (9) are compressed in the horizontal direction, causing the bed to rise. As shown in the accompanying drawings, the legs of the scissor assemblies (2) and (3) are in different positions when the electric lifting device is lifted and when it is closed. The legs of the scissor assemblies (2) and (3) in the fully extended position will raise the top of the mattress to 1016 cm ( 40 inches) in height.

When the bed is lowered by the motor controller (15), the motor (7) starts to rotate the output shaft and the screw rod (14) connected thereto counterclockwise. Due to the rotation of the screw rod (14), the moving nut (13) arranged on the screw rod (14) moves toward the direction of the motor (7). As the moving nut (13) moves closer to the motor (7), the legs of the scissor assembly connected by pivot pins (6) and moving with the reducer (9) are deployed horizontally and folded inwards, lowering the bed.

In a preferred embodiment, the motor (7) includes a brake. When the motor is not running, the brake automatically locks the motor, allowing the bed to safely maintain its height. This avoids unexpected and unsafe movement caused by the bed's own weight back-driving the screw and motor assembly, causing the bed to sink.

The electric lifting device described above is self-contained in that it is not integral to the mattress or bed frame it is designed to lift. This feature makes the invention portable and can be used with numerous beds at different times. Thus, any user, hotel, or any individual purchasing a new bed or moving, can use the present invention for a new or temporary bed. Unlike prior art adjustable beds, the motorized lift can be carried by the end user. Plus, this electric lift can fit inside a custom made bed frame, or any size bed drawer frame.

Additionally, as shown in Figure 4, the adjustability of the electric lift allows the system to fit all sizes of beds by extending the attachment hooks. Therefore, the user can adjust the size of the bed by controlling the telescopic scale. Figure 8 shows the bed configured to a queen size bed frame.

Figure 10 depicts the sheet, pillow rail (17) in the stretched position. This guide rail (17) is connected in the sleeve barrel or sleeve pipe of a pair of bracket ends on the frame (1). The rails can be manually retracted, or moved electrically and otherwise.

Claims (5)

1. An electric lifting device, comprising a frame, an electric controller, a motor, a speed reducer, a scissor assembly, a screw rod and a moving nut, is characterized in that: the frame is formed by a bracket connection, and there are slide grooves on the inside of the two opposite brackets, The scissors component has 4 brackets, and the middle part of each 2 brackets is connected by a shaft to form a cross bracket that can be rotated around the shaft. One end of each bracket of the cross bracket is a leg, and the leg is connected by a roller. Each bracket of the cross bracket The other end of the motor is connected to the frame and the chute respectively. There is a connecting bracket between the two cross brackets. After the motor is connected to the reducer, it is installed on a connecting bracket. The output shaft of the reducer is connected to the screw, and the screw is connected to the moving nut. The mobile nut is fixed on the connecting bracket of another cross bracket, and the other end of the screw rod is connected on the bracket of the frame. 2. An electric lifting device according to claim 1, characterized in that: there is a flexible shaft connector connecting the drive shaft and the screw of the reducer. 3. An electric lifting device according to claim 1 or 2, characterized in that there are four width-expanding arms inserted into the end brackets of the frame and connected with attachment hooks. 4. An electric lifting device according to claim 3, characterized in that: there are guide rails connected to the sleeves or sleeves at the bracket ends on the frame. 5. An electric lifting device according to claim 1 or 2, characterized in that: the reducer is a reduction worm gear device.

Images