JP3524959B2 - lift device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device.

[0002]

2. Description of the Related Art As a device for raising and lowering an elevating member such as a shelf or a stand, conventionally, an elevating member is vertically driven by an up-and-down driving mechanism having a motor, a chain, etc., and a load is elastically held by a spring or the like. There is a type in which the lifting member can be manually moved up and down by balancing the holding force of the member. Alternatively, there is a manual chain block for heavy loads.

[0003]

However, if the above-mentioned vertical drive mechanism is used, the whole structure becomes complicated and the cost becomes high. Further, the load balancing method cannot cope with the case where the load fluctuates greatly, and there is a problem that the elevating member does not ascend and descend smoothly. That is, if it is adjusted to a light load, it is difficult to raise the elevating member due to the heavy load when it is heavy, and conversely, if it is adjusted to a heavy load, it will be difficult to lower it due to its resilience at a light load.

Further, in the case of the manual chain block, it is necessary to change the grip every time the chain is pulled down in order to move the load up and down, and the operation is troublesome, and when the lock by the ratchet for preventing reverse rotation is released, the load falls by its own weight. There is a risk of

Therefore, an object of the present invention is to provide a lifting device that solves the above problems.

[0006]

In order to achieve the above-mentioned object, the present invention has a drum around which a linear member is mounted so that an elevating member can be raised and lowered and which is pulled out by a manual pulling force. At the same time, a deceleration mechanism for decelerating the pulling stroke for manually pulling out the linear body to ½ or less and converting the pulling stroke into a vertical stroke of the elevating member is provided. A one-way clutch that transmits only the stroke as the vertical stroke of the elevating member is provided.

Further, to rotate the nut member, the nut member and screw shaft for raising and lowering the temperature descending member by screw forward and backward, in drawers Manually tension of wound striatum on the outer circumference by rotation The drum, an elastic member that imparts a rotational torque in the direction for rewinding the filament to the drum, and only the rotational torque of the drum in a direction that is contained in the drum and pulls out the filament is the screw shaft. And a one-way clutch for transmission.

Further, a first gear for rotating the screw shaft, a second gear meshing with the first gear, and a third gear connected to the drum via a one-way clutch,
And a switching mechanism for selectively meshing the third gear with the first gear and the second gear.

[0009]

When the filament wound around the drum is pulled out, the one-way clutch transmits only the stroke in the pulling-out direction to the elevating member as a vertical stroke to raise and lower the elevating member, but it is not rewound to the drum. The one-way clutch does not transmit the stroke of the linear body in the vertical direction to the lifting member as a vertical stroke, and the lifting member is maintained in the lifting stopped state.

Therefore, the elevating member can be intermittently moved up and down only by repeating the reciprocating stroke operation of pulling out and rewinding the linear body, and no matter how long the distance is raised or lowered, the linear body The stroke per turn does not become too large.

[0011]

The present invention will be described in detail below with reference to the drawings illustrating the embodiments.

FIG. 1, FIG. 2 and FIG. 3 show an embodiment of an elevating device according to the present invention. This elevating device can be operated by an elevating member 1 such as a shelf, a table, a table or a lifter and a manual pulling force. And a drum 3 around which the linear body 2 is drawn out, and a reduction mechanism for decelerating the pulling stroke S for manually pulling out the linear body 2 to less than or equal to ½ and converting it into a vertical stroke of the elevating member 1. 4 and a one-way clutch 5 that is internally contained in the drum 3 and that transmits only the stroke of the linear member 2 in the pull-out direction as the vertical stroke of the elevating member 1.

The elevating member 1 is attached to a plurality of vertical guide rails 6 in the vertical direction via a plurality of guide rollers 7 capable of rolling the guide rails 6 so as to be able to move up and down. The guide rail 6 is provided on a base member including a frame and a frame body.

The lifting member 1 is provided with a nut member 8,
Further, the screw shaft 9 parallel to the guide rail 6
Is rotatably attached to the base member via a bearing or the like. The male screw of the screw shaft 9 and the nut member 8
Female screw is screwed, and the nut member 8 is screwed back and forth by the rotation of the screw shaft 9 to raise and lower the elevating member 1.

Therefore, as long as the screw shaft 9 does not rotate, the elevating member 1 is maintained at its height and self-held, so that the elevating member 1 does not drop by its own weight, the cutting of the filament 2 and the elastic member described later. It is safe even if the 28 is broken, the gears 11, 12, 15, 16 are damaged, or even if the gears 11, 12, 15, 16 can freely rotate.

Further, the lifting device has a first gear 11 for rotating the screw shaft 9 via bevel gears 15 and 16.
A second gear 12 that is fixed to a pivot 25 that is rotatably pivoted to a base member via bearings and that meshes with a first gear 11, and is connected to a drum 3 via a one-way clutch 5 and a pivot 17. The third gear 13 and the third gear 13 to the first gear
11 and a switching mechanism 14 that selectively meshes with the second gear 12.

The bevel gear 16 is fixed to one end of the screw shaft 9, and further, the bevel gear 15 and the first gear 11 are provided.
Is fixed to a pivot shaft 10 rotatably attached to a base member via a bearing or the like so as to integrally rotate coaxially. The bevel gears 15 and 16 are always meshed with each other to convert the axis of rotation into a right angle.

The third gear 13 is fixed to the pivot 17 so that the third gear 13 and the drum 3 can rotate coaxially, and the one-way clutch 5 is interposed between the shaft center hole of the drum 3 and the pivot 17. To be done. This one-way clutch 5 transmits to the screw shaft 9 only the rotational torque of the drum 3 in the direction in which the filament 2 is pulled out.

As shown in FIG. 4, the one-way clutch 5 has an annular outer ring 19 in which a plurality of recesses 18 with cam surfaces 18a that are open to the inner diameter side are formed at a predetermined pitch in the circumferential direction, and a recess 18.
A roller 20 inserted into the outer ring 19 and a compression spring 21 that presses the roller 20 in the circumferential direction. The drum 3 is fixed to the outer peripheral surface of the outer ring 19, and the pivot 17 is inserted into the center hole of the outer ring 19. .

The direction of the arrow A shown in FIG.
This is the rotation direction of the drum 3 when pulling out (see FIG. 3), and only when the drum 3 and the outer ring 19 rotate integrally in this A direction, the roller 20 is wedged between the cam surface 18a and the outer peripheral surface of the pivot shaft 17. The rotary torque of the drum 3 is transmitted to the pivot shaft 17 while acting, and B (opposite the direction A) shown in FIG.
When rotating in the direction, the roller 20 disengages from the cam surface 18a, the drum 3 and the outer ring 19 idle, and no rotational torque is transmitted to the pivot shaft 17.

Further, as shown in FIGS. 1 to 3, the pivot 17 is rotatably attached to one end of the support member 24 via bearings 22, 22. The other end of the support member 24 is swingably connected to the base member by a shaft member 23, and by swinging the support member 24, the third gear 13 is selected between the first gear 11 and the second gear 12. It meshes together.

Since the one-way clutch 5 always transmits the rotational torque in only one direction A to the third gear 13,
The rotation direction D of the first gear 11 when the third gear 13 meshes with the second gear 12 and the rotation direction C of the first gear 11 when the third gear 13 meshes with the first gear 11 are opposite. become. In addition, when the first gear 11 rotates in the C direction and the screw shaft 9 rotates via the bevel gears 15 and 16, the nut member 8 is screwed upward so that the screw member 9 is screwed upward.
The direction of the screw of the nut member 8 is set.

A switching lever 26 is swingably connected to the support member 24, and the support member 24 is swung by the operation of the switching lever 26 to engage the third gear 13 with the first gear 11 and the first gear 11. Alternately switch to the two gear 12. 27 is a stopper, which locks and disengages the bent tip end of the switching lever 26 so that the third gear 13
It is for locking the position of. The support member 24, the switching lever 26, the stopper 27 and the like constitute the switching mechanism 14.

The reduction mechanism 4 includes the screw shaft 9, the nut member 8, the bevel gears 15 and 16, the first gear 11, the second gear 12, the third gear 13, the pulley 35 and the filament 2 and the like. Composed. By appropriately setting the number of teeth of these gears 11, 15 ..., the pitch of the screw of the screw shaft 9, etc., the pulling stroke S for pulling out the linear member 2 is reduced to less than half and the vertical direction of the lifting member 1 is reduced. Convert to stroke. In other words, the force to be applied by hand to pull out the filamentous body 2 and raise the elevating member 1 is half or less.

The drum 3 has a pair of outer flanges, and one end of the filamentous body 2 such as a cord or a wire is fixed to the outer circumference between the outer flanges and is wound a predetermined number of times. At the other end of the filament 2,
An annular handle 31 is connected, and the drum 3 is rotated by pulling out the filamentous body 2 by a manual pulling force.

The intermediate portion of the linear member 2 is inserted into the guide portions 32 with holes provided on the elevating member 1, and the pulleys 33,
Passed to 34 and 35 in sequence. In the illustrated example, the pulleys 33 and 35 are provided on the elevating member 1, and the pulley 34 is provided on the base member.
If the linear member 2 is suspended by providing the pulley 35 in this way, the nut member 8 is lifted upward when the linear member 2 is pulled out, and the frictional resistance of the screwed portion with the screw shaft 9 is reduced. , Starts up smoothly.

As shown in FIGS. 1 and 5, the drum 3
An elastic member 28 is provided in the. As the elastic member 28, a mainspring is used, and the inner winding end of the mainspring spring is fixed to the outer periphery of the drum 3 for winding, and the outer winding end of the mainspring spring is fixed to the base member to form a wire. A rotation torque for rewinding the strip 2 is applied to the drum 3.

Alternatively, as shown in FIG. 6A, a tension coil spring is used as the elastic member 28 and a string 29 or the like having one end fixed to the drum 3 is wound around the drum 3 and the other end of the string 29 is wound. A tension coil spring may be interposed between the portion and the base member.

Further, as shown in FIG. 6B, a constant force spring is used as the elastic member 28, and one end of the constant force spring is fixed to the outer periphery of the drum 3 to be wound and the constant force spring The other end may be fixed to the fixed shaft 30 of the base member and wound.

Therefore, in order to raise the elevating member 1,
As shown in FIGS. 1 to 3, the third gear 13 is meshed with the first gear 11 by the switching lever 26, and the linear member 2 is repeatedly reciprocated until the elevating member 1 reaches a desired height. Just enough.

Specifically, if the filament 2 is manually pulled out against the rewinding force of the drum 3 by the elastic member 28,
The drum 3 rotates, the rotational torque thereof is transmitted to the third gear 13 by the one-way clutch 5, the screw shaft 9 rotates via the first gear 11, the bevel gears 15 and 16, and the elevating member 1 rises.

When the pulling-out of the linear member 2 is stopped and the tensile force is loosened, the lifting member 1 stops rising, and the drum 3 is rotated by the elastic member 28 in the direction opposite to the pulling-out direction A, and the linear member 2 Is rewound on the drum 3 and automatically restores the state before the filament body 2 is pulled out. At this time, the one-way clutch 5 causes the drum 3 to idle with respect to the third gear 13, and the third gear 13 does not rotate, so that the lifting member 1 is maintained in the stopped state.

In this way, the linear member 2 is reciprocated, and this operation is repeated until the elevating member 1 is lifted to a desired height. On the contrary, in order to lower the lifting member 1,
The third gear 13 is meshed with the second gear 12 by the switching lever 26,
The same reciprocating stroke operation as described above for the linear member 2 may be repeated until the elevating member 1 reaches the desired height. At this time, the second gear 12 causes the first gear 11 and the bevel gears 15 and 16 to move.
Also, the screw shaft 9 rotates in the opposite direction of the rising and lowering member 1, and the lifting and lowering member 1 descends.

By the way, in the chain block, when the load is lowered to a desired height, the lock by the ratchet must be unlocked, and the force holding the chain must be delicately lowered so that the load does not drop suddenly. However, the present invention does not have such a problem and is easy to operate.

The present invention is not limited to the above-mentioned embodiments, and the design can be freely changed without departing from the gist of the present invention. For example, it is also preferable to attach a coil spring, a gas spring, or the like for elastically urging the elevating member 1 always upward so as to reduce a part of the weight of the elevating member 1. Further, the structure shown in FIG. 1 is upside down, and the one-way clutch 5 is not limited to the one shown in the drawing. It is also possible to use various structures such as a meshing clutch. Includes everything that transmits rotational torque only to. Also, pulley 3
The omission of 3, 34, 35 is free, and the bevel gear 1
The gears 11 may be directly connected to the screw shaft 9 by omitting 5, 16 and changing the arrangement of the drum 3, the gear 11, and the like.

[0036]

Since the present invention is constructed as described above, it has the following great effects.

According to the lifting and lowering device of the first aspect, the lifting member 1 can be lifted and lowered by the reduction mechanism 4 and the one-way clutch 5 only by manually repeating the stroke of the linear member 2, and Even when the elevating / lowering member 1 has a long elevating / lowering distance, the stroke per one time does not increase, and the elevating / lowering member 1 can always be raised and lowered with an appropriate stroke. Moreover, the linear body 2 can be operated with one hand, and it is not necessary to re-grip, and the operability is good.

The pulling stroke S for manually pulling out the linear member 2 is reduced to less than half by the speed reduction mechanism 4 and converted into a vertical stroke of the elevating / lowering member 1, so that a large manual force is required. The load can be raised and lowered, and even if the load changes, it can be smoothly and lightly raised and lowered. Since it is not necessary to use a power source such as a motor, the structure is simple, the cost is not high, and maintenance is unnecessary.
Further, it is safe because the lifting device for balancing the loaded load by the spring or the like does not cause the lifting.

According to the lifting and lowering device of the second aspect, if the operation of the linear member 2 is stopped, the lifting and lowering member 1 stops and does not move at that height due to the screwing of the screw shaft 9 and the nut member 8. , A mechanism for separately locking the raising / lowering position of the raising / lowering member 1 is not required, the structure can be simplified, and again,
Even when the operation of the filamentous body 2 is started, no special operation such as unlocking is required, the operability is good, and even if the filamentous body 2 is broken or the elastic member 28 is damaged, The elevating member 1 does not drop by its own weight and is excellent in safety.

According to the lifting and lowering device of the third aspect, the switching mechanism 14 allows the third gear 13 to be connected to the first gear 11 and the second gear 12.
By selectively engaging with each other, both the raising and lowering of the elevating member 1 can be performed with the same reciprocating stroke operation of the filament body 2 at all times, and the operation is simple.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a front view of a main part.

FIG. 3 is an enlarged side view of a main part.

FIG. 4 is a front view of the main part of the one-way clutch.

FIG. 5 is a simplified diagram showing a mounting state of an elastic member.

FIG. 6 is a simplified diagram showing a modified example of a mounted state of a resilient member.

[Explanation of symbols]

1 Lifting member 2 striatum 3 drums 4 Reduction mechanism 5 one-way clutch 8 Nut member 9 screw shaft 11 First gear 12 Second gear 13 Third gear 14 Switching mechanism 28 elastic member S stroke

Claims (3)

(57) [Claims] 1. A lifting member 1 is attached so as to be able to move up and down, and a drum 3 around which a linear body 2 is drawn by a manual pulling force is wound, and the linear body 2 is pulled out manually. A deceleration mechanism 4 for decelerating the stroke S to less than or equal to half and converting it into a vertical stroke of the elevating member 1.
And a one-way clutch 5 for transmitting only the stroke of the linear member 2 in the pulling direction as the vertical stroke of the elevating member 1. And wherein the nut member 8, the drawer by the the screw shaft 9 of the nut member 8 by screw reciprocating elevating the temperature descending member 1, a manual pulling force of the umbilical member 2 wound around an outer circumference by rotation Drum 3 which rotates at a line, and the linear body 2
The elastic member 28 for imparting a rotational torque to the drum 3 in the rewinding direction and only the rotational torque of the drum 3 contained in the drum 3 in the direction to pull out the linear body 2 to the screw shaft 9. One-way clutch 5 to transmit,
A lifting device comprising: 3. A first gear 11 for rotating a screw shaft 5, a second gear 12 meshing with the first gear 11, a third gear 13 connected to the drum 3 via a one-way clutch 5, The lifting device according to claim 2, further comprising a switching mechanism (14) for selectively engaging the third gear (13) with the first gear (11) and the second gear (12).