JPH02239100A - Lifting device - Google Patents

Abstract

PURPOSE:To apply always uniform spring force to each winding member by applying the rotation power of a rotating spring unit to a lifting base via an output shaft, a plurality of prime-mover drums fixed to same and the winding members delivered from the drums. CONSTITUTION:A load corresponding to the weight distribution of a lifting base 4 is applied to each winding member 17. In this case, even if winding members 17 on a light load side are about to be wound up onto prime-mover drums 16, this action is simultaneously transmitted to other prime-mover drums 16 via an output shaft 15. Therefore, the winding members 17 are always unwound onto or delivered from the prime-mover drums 16 each by equal quantity with a uniform unwinding/delivering force. Hence, any lopsided weight distribution can be absorbed by the simultaneous rotation of a plurality of prime-mover drums 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lifting device using a constant force spring that always outputs a constant spring tension. This lifting device is applied to lifting and lowering a computer display placed inside a desk top plate, an underfloor storage space, and the like.

[Conventional technology]

The computer main body and all of its peripheral devices are built into the desk, and the display in particular can be moved up and down between a storage position in which the entire computer is stored inside the top of the desk and a position in which it protrudes from the top J-. A desk dedicated to a computer is publicly known (documents unknown).

In this case, a constant force spring is used as a power source for raising the platform.

A constant force spring is a type of spiral spring in which a band-shaped spring body is wrapped around a rotatably supported boob, but its spring characteristics are unique and are always constant regardless of the pull-out stroke of the spring body. Outputs the spring tension. There are two types of constant force springs: a tension type, which uses the relative movement between the spring body and the boot as an output when the spring body is pulled out from the boot, and is unwound onto the boo; There are two types: a rotating type that uses motion as output. In the above-mentioned lifting device, a tension type constant force spring has been exclusively used as a power source.

[Problem to be solved by the invention]

For example, in a display lifting device, a lifting platform is often suspended and supported by two or four tension-type constant force spring units (hereinafter simply referred to as spring units). In such a case, if there are variations in the load acting on each spring, the lifting platform cannot be moved smoothly.

If there is a difference in the load acting on each spring unit due to an uneven weight distribution on the lifting platform or a difference in the mounting position of the spring unit, a force that causes the lifting platform to tilt will act, causing the platform to become caught on the lifting guide surface. This is because it occurs.

Therefore, for example, when mounting displays of different manufacturers or models on a lifting platform, it is necessary to make adjustments such as shifting the mounting position of the ice play or adding weights to adjust the weight distribution. There was a disadvantage that it lacked. This invention has been proposed in view of the above, and its purpose is to provide a highly versatile lifting device that can reliably and smoothly move up and down regardless of the weight distribution of the lifting platform. .

Another object of the invention is to:
To make it possible to change and adjust the output value of a spring unit, and to enable proper lifting and lowering operations even when the weight of a loaded object fluctuates.

[Means to solve the problem]

In this invention, the rotary spring unit 9 is used as a power source, the rotational power is outputted through the output shaft 15, and this is converted into a linear tensile force by the winding member 17 and the driving drum 16. By applying the converted tensile force to a plurality of locations on the lifting platform 4, the lifting platform 4 can be raised and lowered with a uniform operating force regardless of the bias in weight distribution.

Specifically, as shown in FIG. 1, it is equipped with an elevating platform 4 and guide means 8 for guiding and supporting it in a freely descending manner.
A rotary constant force spring unit 9 for lifting the lifting table 4 against gravity is provided on a fixed wall 14 facing the lifting table 4 at one end of the lifting stroke, and the rotational power of the spring unit 9 is output. A plurality of driving drums 16 are connected to the output shaft 15.
A plurality of winding members 17, each of which is fixed so as to be rotatable together and whose drawn end is connected to the lifting table 4, are wound around and attached to each of the driving drums 16 to constitute a lifting device.

The lifting platform 4 is placed in the space above the fixed wall 14 by the guide means 8
In the lifting device that is supported so as to be able to rise and fall freely, the driving drum 16
The winding member 17 pulled out from the
to set the moving direction of the unwinding end of the winding member 17 upward, and connect the unwinding end of the winding member 17 to the elevating member 13 that is guided up and down by the guide means 8. can.

Preferably, the winding member 17 is provided between the driving drum 16 and the pulled-out end of the winding member 17 during the travel path of the winding member 17.
A 1,000-stage brake 10 is provided to apply running resistance to the vehicle, and the brake means 10 is configured so that the running resistance can be changed in magnitude.

(Function) A load corresponding to the weight distribution of the lifting platform 4 acts on each of the winding members 17. However, if the winding member 17 on the light load side
7 is about to be wound up on the driving drum 16,
This operation is simultaneously transmitted to the other driving drums 16 via the output shaft l5, so each winding member 17 is always rewound onto the driving drum 16 in equal amounts with equal unwinding force, or It is drawn from 16. In other words, the bias in the background distribution is absorbed by the simultaneous rotation of the plurality of driving drums 16.

〔Effect of the invention〕

Henceforth. - In the lifting device of the present invention, the rotational power of the rotary spring unit 9 is transferred to the output shaft l5, the plurality of driving drums 16 fixed thereto, and the winding members pulled out from each drum 16, as shown in FIG. 17 to the lifting platform 4, even if there is a bias in the weight distribution on the kidney descending platform 4j-, this can be absorbed by the simultaneous rotation of the driving drum 16, and each winding member A uniform spring force can always be applied to 17. As a result, the lifting platform 4
Even if the center of gravity of the loaded object is biased or the loading position is biased toward the affected end, the lifting platform 4 can be moved up and down reliably and smoothly, and the weight distribution can be optimized. Adjustment work can be omitted. In particular, in the case of a lifting device that is equipped with a computer display 5, there is no need to pay attention to differences in manufacturer or model, and as long as the total weight is within a specified range, the display 5 can always be mounted.
It can be used immediately by simply placing the lifting device 5 on the lifting table 4, and the versatility of the lifting device can be improved.

In the case where the lifting platform 4 is disposed in the leakage space from the fixed wall 14, the winding member 17 is placed in the rA. The direction change is guided by the direction changing booths 27 and 28 provided on the descending platform 4, and the pull-out end is connected to the ascending/descending platform 4.
A spring connected to the elevating member 13 integral with the elevating table 4 and provided below the elevating table 4. 12-/ } 9 is used to pull the lifting platform 4 in the - direction so that it can be biased.
When lifting, main equipment such as the spring unit 9, output shaft 15, and motive tram 16 can be easily and compactly incorporated into the inner bottom of the elevating space.

Since the adjustable braking means 1O is provided in the traveling path of the winding member 17, the weight of the load on the lifting platform 412 can be reduced.
By adding running resistance to the winding member 17, the spring force outputted through the winding member 17 can be adjusted by changing the force of the person and the load. Movement speed and acceleration can always be adjusted appropriately.

[First Embodiment] Figures 1 to 14 show a combination of this invention. A first embodiment is shown in which the present invention is applied to a one-meter dedicated desk.

In Figure 14, the computer dedicated desk l is
It has a square box-shaped case 3 that opens toward the north in the left half of the box. By raising and lowering the lifting platform 4 using the lifting device provided inside the case 3, the lifting platform 4}. A cathode ray tube type display (mounted object) 5 mounted on the can be raised and lowered into a usage position in which it projects above the top plate 2 and a storage position in which it is stored in the case 3. This desk can be used as a normal office desk by closing the opening 1 of the case 3 with a lid (not shown) after storing the display 5. In addition, inside the desk 1 there is a ζ computer main body, keyboard 6,
and peripheral devices such as external storage devices.

In FIGS. 2 to 4, the lifting device is the lifting platform 4.
, a guide means 8 that guides and supports this so that it can slide up and down within the case 3, a power mechanism whose driving source is a rotary constant force spring unit 9, and a brake f stage 10 that adjusts the output of the power mechanism. It includes a lifting means 1) for maintaining the storage position of the lifting platform 4, and the like.

The elevating table 4 is made of a rectangular plate-like body, and sliders (elevating members) 13 are integrally attached to the lower surface of the four corners of the elevating table 4 via brackets 12. Fixed. Four guide stages 8 are provided at the four corners of the inner surface of the case 3, corresponding to each slider l3. The guide means 8 is made of a strip having a U-shaped cross section, and the slider 13 is fitted into the guide groove 8a.
It guides and supports it so that it can slide only up and down. As shown in FIG. 3, the guide means 8, which form a pair in the front and rear on the right and left sides of the lifting platform 4, respectively, are aligned with the power transmission path of the power mechanism, which will be described later, and are shifted left and right. Arrange.

In FIGS. 1 and 2, the power mechanism includes a constant force spring 9 mounted on the fixed wall 14 at the inner bottom of the case, and transmits the rotating power to the output shaft 15 and four springs installed at both left and right ends of the output shaft 15. It is outputted via the driving drum 16 and transmitted to the lifting platform 4 via the winding member 17.

The spring unit 9 uses a band-shaped spring body 19 bent in the shape of a spiral spring as a force accumulating body, and is connected to the winding drum 20.
The spring body 1 is wound on the winding drum 20 and pulled out from the winding drum 20.
9 is wound up in an inverted manner by an output drum 21. The winding drum 20 is rotatably supported via a bracket 22.

The output drum 21 is fixed to the output shaft 15-H, and the output drum 21 is fixed to the output shaft 15-H.
and rotatably supported via a bearing bracket 23.

In order to convert the rotational movement of the output shaft 15 into vertical movement, two driving drums 1 are installed at each of the left and right ends of the output shaft 15.
6 and 16 are lined up and fixed, and a wrapping member 17 made of stainless steel tape is wrapped around and attached to each. As shown in FIG. 7, the output shaft 15 is also supported by bearing brackets 26 that sandwich the driving drum 16 on both sides.

The four winding members 17 pulled out from the driving drum 16 are guided to the four corners of the case 3 via a group of deflection boots 27 and 28 provided near the upper ends of the left and right side walls of the case 3.
Its drawn end is fixed to the slider 13. Fourth
As shown in the figure, the winding member 17 is supported and fixed by the slider 13 and a clamping plate 13a screwed to the slider 13.

In FIGS. 2 and 3, the direction changing booleans 27 and 28 are provided as a set of two corresponding to each winding member 17. Specifically, first deflection pulleys 27 are arranged on two sides of each of the four left and right driving drums 16, and second deflection pulleys 28 are arranged on two sides of each six-sided means 8. . The first direction changing boob 27 adjacent to the driving drum 16 on the L side
27 are supported by one central shaft 29 so that each can rotate independently. The center position of this central shaft 29 is set at the true L of the drawing start end of the winding member 7 on the driving drum 16. The second direction changing booths 28 located at the four corners are each rotatably supported by support shafts 30 fixed to the inner surface of the case 3. As shown in FIG. 2, each winding member 17 is guided forward or backward by a first deflection pulley 27 and downwardly by a second deflection pulley 28. As shown in FIG.

As a result, the rotational output of the spring unit 9 is
L at the pull-out end of 7 (connection end with slider 13)
It acts as a biasing force in the direction.

The spring unit 9 outputs rotational power when the spring body 19 wound around the output drum 21 is unwound to the winding drum 20 side, and this power causes the winding member 17 to be moved around the drive drum 1.
6 and move the lifting table 4 up and down 12 times. In other words, the output torque of the pane unisoto 9 is set to a value that can overcome the weight of the lifting platform 4 and the display 5 and lift them.

In order to adjust the torque output according to variations in the weight of the display 5, braking means 10 are provided on the left and right sides of the case 3 using the first direction changing boot 27. 5 and 6, the brake means 10 includes a brake roller 32 that circumscribes the upper surface of each deflection pulley 27 via a winding member 17, and both brake rollers 32 are rotatable via a shaft 33. A compression spring 35 that presses and biases the roller frame 34 toward the direction changing pulley 27, an adjustment screw 37 that changes the amount of deflection of the compression spring 35 via the spring receiving frame 3G, etc. .

Each of these members is connected to the frame 3 that supports the deflection booth 27.
It is incorporated in 8. The roller frame 34 is movable only in the vertical direction, and for this purpose, two shafts 39 fixed to the upper surface of the roller frame 34 are slidably guided by the spring receiving frame 36, and the roller frame 34 is moved as shown in FIG. Frame 3 on both sides
It is sandwiched and held by the interval holding shaft 40 of 8.

The adjustment screw 37 can be adjusted from the top plate 2 side through an adjustment hole 41 that passes through the opening periphery of the case 3. When the adjustment screw 37 is screwed in and the tension of the compression spring 35 is increased, the brake roller 32 is adjusted. The winding member 17 is strongly pressed to increase its running resistance. Conversely, when the adjusting screw 37 is loosened, the running resistance of the winding member 17 decreases.

As shown in FIGS. 2 and 7, the inside of the box-shaped gate 4'3 fixed on both left and right sides near the front end of the lower surface of the ascending platform 4, and the box-shaped case 43 facing the F end of the ascending and descending trajectory. Stretching means 1) are provided over both sides of the case. The stop bar means 1l holds the lifting platform 4 in an immovable manner in the stored state, and when the lifting platform 4 is further pushed down from this state, the locked state is released and the lifting platform 4 can be moved one way.

In FIGS. 8 and 9, a latch 44 and a lock release member 45 that restricts the latch 44 from advancing when the lock is released are incorporated inside the box-shaped case 43. Also,
On the side wall of the case, a saw blade-shaped engagement block 46 and a switching lever 47 for returning the lock release member 45 to the standby state are provided in correspondence with the rasochi 44.

The lathe 44 is guided and supported by a guide frame 48 fixed to the inner bottom of the case so as to be slidable left and right, and is biased toward the outside of the case by latch springs 49 provided at the front and rear of the guide frame 48. In order to define the advancing limit of the rasochi 44, a bottle 50 is fixed at the front and rear of the inner end of the case, and its movement is restricted by a guide groove 51 provided through the front and rear walls of the guide frame 48.

A relief groove 52 is formed in the middle of the latch 44, penetrating downward seven times (see FIG. 10). At the inner end of the locking block 46, a locking guide surface 54, an engagement recess 55 into which the latch 44 is depressed and engaged, and a release guide surface 56 are formed in order from the J side. Both guide surfaces 54 and 56 push and move the latch 44 inward of the case against the urging force of the latch spring 49. FIG. 7 shows the candle state in which the ratchet 44 has fallen into the engagement recess 55.

The lock release member 45 includes a shaft 57 supported by the rfX rear wall of the box-shaped case, a passive lever 58 and a check lever 59 fixed to the front and rear of the shaft 57, and a counterclockwise rotation of the passive lever 58. It consists of a return spring 60. The passive lever 58 protrudes outside the case from a vertical length 661 extending through the side wall of the box-shaped case 43. The check lever 59 is located directly above the latch 44, and its free end is in contact with the upper surface of the ratchet 44 through a window 662 provided through the upper wall of the guide frame 48.

The switching lever 47 is supported by a bracket 64 through a pin 67 so as to be able to swing downward in the l- direction, and is urged to swing counterclockwise in the counterclockwise direction by a return spring 65 hooked to the upper surface thereof. A stopper wall 66 that defines the upper swing limit of the switching lever 47 is provided on one surface of the protruding end 1 of the bracket 64, and this wall 66 holds the switching lever 47 in a horizontal position and in a standby state.

The operation of the stopper means 1) will be explained with reference to FIGS. 9 to 13. In addition, in FIGS. 10 to 13, each member is depicted in a simplified manner.

When the lifting platform 4 is pushed against the output of the constant force spring 9, the latch 44 comes into contact with the retaining block 46 and is pushed back by the engagement guide surface 54 thereof. When the latch 44 passes over the lower end of the retaining guide surface 54 as shown in FIG. 10, the latch 44 advances due to the urging force of the launch spring 49 and falls into the engagement recess 55 to prevent the lifting platform 4 from moving upward.

At this time, since the check lever 59 is in contact with the L surface of the latch 44, its posture remains unchanged. The passive lever 58 is in contact with the switching lever 47 and is connected to the return spring 65.
to sway together against.

From this state, when the elevator platform 4 is further pushed down as shown by the imaginary line in FIG. 7, the engagement between the latch 44 and the engagement recess 55 is released. 1) As shown by the imaginary line in the figure, as the lifting platform 4 descends, the passive lever 58 descends while remaining in an almost horizontal protruding position, but when the passive lever 58 falls below a certain height, the switching lever The engagement between the tip of the swing lever 47 and the tip of the passive lever 58 is released, and the switching lever 47 is pulled back by the return spring 65 and returns to the horizontal position. During this time, the latch 44 is pushed inward by the release guide surface 56, and its escape groove 52 moves inward beyond the free end of the check lever 59 near the lower end of the release guide surface 56, as shown by the solid line. , the check lever 59 is in the relief groove 52
Fall inside.

At the same time, the passive lever 58 also swings, but in the middle. Since the E surface comes into contact with the upper end of the elongated hole 61, it will no longer be inclined. This switching state can be recognized by the sound of the switching lever 47 and the passive lever 58 hitting each other.

After hearing the hitting sound or after pushing down the lifting platform 4 to the lower limit defined by the guide means 8, when the pushing force is released, the lifting platform 4 starts to rise. This L
A passive lever 58 and a check lever 59 prevent the latch 44 from engaging with the engagement recess 55 again during the upward movement.

In FIG. 12, the passive lever 58 is prevented from swinging in one direction by the elongated hole 6l. Therefore, latch 4
4 attempts to advance due to the biasing force of the spring 49, but is stopped by the check lever 59 that has fallen into the relief groove 52, and the state in which the person retreats is maintained due to the escape groove.

Therefore, the lasso chi 44 passes through the lower range where engagement is possible without engaging the engagement recess 55, and the retaining guide surface 54
Move in two directions.

As the elevator platform 4 rises, the passive lever 58 comes into contact with the lower surface of the switching lever 47. At this time, the switching lever 47
is received by the stop flange wall 66, and its swinging in the F direction is restricted. Therefore, the passive lever 58 and the check lever 59 are forcibly moved counterclockwise against the biasing force of the return spring 60 and the advancing force of the latch 44, and the latch 44 is engaged as shown in FIG. When the lever 59 is raised to a position facing the lower end of the matching guide surface 54, the check lever 59 comes out of the escape groove 52, and the restriction on the operation of the latch 44 is released. In other words, the lathe 44 returns to its normal advanced state, and the lock release member 45 is also reset to its standby state. It should be noted that the passive lever 58 swings in the '0' direction until it crosses over the switching bar 47, and then returns to its original position by the return spring 60 as shown in FIG.

According to the elevating device as described in -1- below, even if the weight distribution on the elevating table 4L is uneven, the four driving drums 16 always rotate simultaneously, and the output of the spring unit 9 can be raised and lowered evenly. Since it can act on the platform 4, the lifting platform 4 can be moved up and down reliably and smoothly. Also,
The mounting position of the display 5 can be freely changed within the range of the lifting platform 4.

By operating the adjustment screw 37 to change the running resistance of the winding member 17, the output torque of the spring unit 9 can be adjusted appropriately. Lifting platform under acceleration 4
can be operated up and down. If necessary, the lifting speed and operating force can be adjusted freely according to the user's preference.

By constantly pressing down on the lifting platform 4, the lifting platform 4 can be automatically locked so that it cannot be lifted up. Furthermore, by pushing down from the locked state, the locked state can be automatically released, so the display 5 can be taken in and out with a simple operation. It's possible and easy to use.

[Second Embodiment] FIG. 15 shows a second embodiment of the present invention. In this case, a power mechanism is provided on the earthen wall (fixed wall) 14 of the elevating space of the elevating table 4, and the elevating device is installed so that the elevating table 4 is suspended and supported by two winding members L7 drawn out from the driving drum 16. changed.

This elevating device can be used, for example, as a storage rack that utilizes the space between walls, or as a storage tool that utilizes the ceiling space. In FIG. 15, members equivalent to those in the first embodiment are denoted by the same reference numerals, and their explanations are omitted. Furthermore, the brake means 10 and the lower stopper 1) are not shown.

[Another embodiment example]

A wire rope can also be used as the wrapping member 17. Further, the elevating member 13 may have a roller structure. ．． It is also possible to form the guide means 8 with a shaft and provide the slider 13 so as to fit onto the shaft.

A gear or an increasing/decelerating mechanism may also be provided between the output shaft 15 and the output drum 21.

[Brief explanation of drawings]

1 to 14 show a first embodiment of the lifting device according to the present invention, FIG. 1 is a perspective view for explaining the principle of the present invention, and FIG. 2 is an A-A in FIG. 3. A line sectional view, FIG. 3 is an overall plan view, and FIG. 4 is a plan view showing the guide structure. Figure 5 is a sectional view taken along line B-B in Figure 2, and Figure 6 is a cross-sectional view of Figure 5.
7 is a front view of the main part inside the case showing the stopper means, FIG. 8 is a sectional view taken along I)-D in FIG. 9, FIG. 9 is a longitudinal sectional front view, 10 to 13 are explanatory diagrams of the operation of the stopper means, respectively, and FIG. 14 is a perspective view of the computer desk. FIG. 15 is a longitudinal sectional front view showing a second embodiment of the lifting device according to the present invention. 1... Computer desk, 3... Case, 4... Lifting platform, 5... Display, 8... Guide means, 9... Constant force spring unit, 10... Brake means, 13... Lifting member (slider), 14... Fixed wall, 15... Output shaft, 16... Driving drum, 17.・・・Wrap member, ・Direction change pulley. Fig. Fig. Fig. 1 and a half r ]7 Fig.

Claims (3)

[Claims] (1) It is equipped with an elevating table 4 and a guide means 8 that guides and supports it so that it can be raised and lowered, and the elevating table 4 is placed against gravity against a fixed wall 14 facing the elevating table 4 at one end of the elevating stroke. A rotary constant force spring unit 9 for lifting operation is provided, and a plurality of driving drums 16 are connected to an output shaft 15 that outputs the rotational power of the spring unit 9.
A plurality of winding members 17 are fixed so as to be rotatable together, and the pull-out ends are connected to the lifting platform 4.
is an elevating device that is wrapped around and attached to each of the driving drums 16. (2) The lifting table 4 is supported in a space above the fixed wall 14 so as to be able to rise and fall freely by a guide means 8, and the winding member 17 pulled out from the driving drum 16 is guided by direction changing pulleys 27 and 28, and the winding 2. The elevating device according to claim 1, wherein the moving direction of the unwinding end of the hanging member 17 is set upward, and the unwinding end of the hanging member 17 is connected to an elevating member 13 that is guided up and down by guide means 8. (3) A brake means 10 for applying running resistance to the winding member 17 is provided in the running path of the winding member 17 between the driving drum 16 and the pulled-out end of the winding member 17, and the running resistance is adjusted in magnitude. 3. The lifting device according to claim 1, wherein the brake means 10 is configured to be changeable.