JPH024653Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a rise-up bed device that allows a part of the floorboard to be raised to any desired angle.

[Technical background of the invention and its problems]

Generally, this type of rise-up bed device has a nut screwed onto a rotatably driven screw shaft, and a drive shaft is connected to this nut. One end of an arm is pivotally connected to this drive shaft, and the other end of this arm is pivotally connected to a rotatably provided floor plate. By rotating the screw shaft and moving the nut along the axial direction of the screw shaft, the arm is rotated by the drive shaft, and the floor plate is interlocked with the rotation of the arm.

According to such a structure, when the raised floorboard is lowered, the rate of descent becomes extremely fast due to the own weight of the floorboard and the user's load applied to the floorboard. Therefore, a large impact force is applied to the nut at the end of the stroke when the floorboard is lowered, causing the problem that the nut bites into the screw shaft and damages the threads on both of them.

In order to eliminate these drawbacks,
What is shown in Publication No. 25365 has been proposed. In this prior art, a screw is carved in the center of a rotating shaft, a threaded cylinder and a pressing cylinder are loosely fitted to the rotating shaft, a spring is installed between the rotating shaft and the pressing cylinder, and the rotating shaft is A sliding tube is screwed onto the thread of the shaft. A base plate (floor plate) is attached to this sliding tube via a connecting rod.
are connected. Then, by rotating the rotating shaft and moving the sliding tube, the floor plate is rotated, and when descending, the sliding tube moves from the screw of the rotating shaft to the threaded tube, thereby responding to the rotation of the rotating shaft. The sliding tube is idled together with the screw tube to prevent the screw threads from biting into the screw and the sliding tube.

However, such a structure requires a threaded tube that has a complicated shape and takes time and effort to process, resulting in lower productivity and higher costs. Furthermore, since the threads on the rotating shaft and the threads on the threaded barrel are separated, it is difficult for the sliding barrel to smoothly transition from the thread on the rotating shaft to the thread on the threaded barrel. In particular, since the threaded tube is loosely fitted onto the rotating shaft, play is likely to occur between them, and if the screw threads of both are misaligned in the radial direction due to that play, not only will the sliding tube not be able to move, but There is also a risk that the threads of the sliding tube and the threads of the threaded tube may bite during the transition.

[Purpose of invention]

This invention was made based on the above circumstances, and its purpose is to create a rise-up bed that has a simple structure and can reliably prevent the screws on the driving side and the screws on the driven side from biting. The goal is to provide equipment.

[Summary of the idea]

This invention connects a connecting body having a pair of flanges to the other end of the drive shaft with a nut screwed onto a rotationally driven screw shaft provided at one end, and the pair of flanges inside the connecting body. A cylindrical body having a pressing plate located between the two is slidably fitted on the outside, a friction member is provided between one collar of the connecting body and the pressing plate, and a rotation of the bed device is attached to the cylindrical body. An arm connected to a flexible floor plate is slidably and rotatably connected, and the connecting body is connected between the other collar of the connecting body and the pressing plate, and the friction member is connected between the pressing plate and the one collar. A spring is provided to bias the screw shaft in a direction of clamping the nut, and the screw shaft is rotated in the direction of lowering the floor plate, so that the nut reaches the stroke end and the rotational resistance of the screw shaft becomes greater than the frictional resistance of the friction member. If so, this is a get-up type bed device in which the connecting body is idly rotated with respect to the cylindrical body together with the screw shaft.

[Example of idea]

A first embodiment of this invention will be described below with reference to FIGS. 1 to 4. The bed device shown in FIG. 1 includes a base 1. The bed device shown in FIG. The base body 1 is composed of a rectangular frame body 2 and board bodies 3 attached to both ends of the frame body 2 in the longitudinal direction. The frame body 2 has a first floor plate 4 and a second floor plate 4 from one end in the longitudinal direction.
A floor plate 5, a third floor plate 6, and a fourth floor plate 7 are arranged in this order. The second floor plate 5 is fixed to the frame 2, and one end of the first floor plate 4 is pivotally connected to one end of the second floor plate 5. One end of the third floor plate 6 is pivotally attached to the other end of the second floor plate 5, and one end of the fourth floor plate 7 is pivotally attached to the other end of the third floor plate 6.

A first drive mechanism 8 and a second drive mechanism 9 are disposed on the lower surface side of the frame 2 along the longitudinal direction of the frame 2. The first and second drive mechanisms 8 and 9
is constructed as shown in FIGS. 3 and 4.
That is, 10 in FIG. 3 is a support cylinder. A bearing body 11 is provided within one end of the support tube 10, and a small diameter shaft portion 14 formed at one end of a screw shaft 13 is rotatably supported by the bearing body 11 by a bearing 12. A cap 15 is fitted onto one end of the support tube 10, and this cap 15 has a screw 16 that passes through the peripheral wall of the cap 15 and engages with a locking hole 11a drilled in the radial direction of the bearing body 11. Fixed by A handle 17 shown in FIGS. 1 and 2 is connected to the small diameter shaft portion 14 protruding from the cap 15. As shown in FIGS.

A nut 18 is screwed onto the screw shaft 13. One end of a cylindrical drive shaft 19 having a diameter smaller than that of the support tube 10 is fitted onto the nut 18 and is integrally connected to the nut 18 . The bearing body 11
A sliding member 20 made of a material with a low coefficient of friction, such as Teflon, is provided on the end face opposite to the end face of the nut 18 . A support member 21 is provided at the tip of the screw shaft 13 to abut against the inner circumferential surface of the drive shaft 19 to prevent the drive shaft 19 from swinging in the radial direction. Furthermore, the support tube 10
A plurality of bulges 22 are provided at the tip of the drive shaft 19 to press against the outer peripheral surface of the drive shaft 19, and these bulges 22 prevent the drive shaft 19 from swinging in the radial direction.

A connecting body 25 is connected to the other end of the drive shaft 19, as shown in FIG. In other words, the connecting body 25 has a shaft body 27 to which the first collar 26 is fixed to one end.
has. The other end of this shaft body 27 has a second
A fixing collar 29 provided with a collar 28 is fitted, and is prevented from being pulled out from the shaft body 27 by a stop ring 29a. This fixed collar 2
9 and the other end of the shaft body 27 are each provided with a through hole 30 in the radial direction, and the connecting pin 3 is inserted therethrough.
1, a shaft body 27 and a fixed collar 29 are connected to the other end of the drive shaft 19. The shaft body 2
A slide collar 32 is slidably fitted between the fixed collar 29 of No. 7 and the first collar 26. The first collar 26 of this slide collar 32
A third collar 33 is provided at one end located on the side. Further, a coil-shaped spring 34 is attached to the outer periphery of the slide collar 32.

A cylindrical body 35 is slidably fitted onto the connecting body 25 having the above structure. A pressing plate 36 is fixed inside the cylindrical body 35. This pressing plate 3
6 is located between the second collar 28 of the fixed collar 29 and the other end surface of the slide collar 32, and is connected to the shaft body 2.
A through hole 37 having a larger diameter than the shaft body 27 through which the slide collar 7 is inserted and a smaller diameter than the outer diameter of the slide collar 32 is bored. The second part of the pressing plate 36 and the fixed collar 29
A friction member 38 made of a material with a large coefficient of friction is provided between the shaft body 27 and the flange 28 . A spring 34 attached to the slide collar 32 is provided in a compressed state between the press plate 36 and the third collar 33, and its restoring force urges the cylindrical body 35 in the direction of arrow a. ing. Therefore, the friction member 38 is attached to the second collar 2.
8 and the pressing plate 36, the frictional resistance prevents the drive shaft 19 from rotating freely relative to the cylindrical body 35. The cylindrical body 35 moves the spring 3 in the direction opposite to the arrow a by the dimension between the pressing plate 36 and the other end surface of the slide collar 32.
4 can be compressed and slid.
When the cylindrical body 35 slides in this direction, the clamping state of the friction member 38 between the second collar 28 and the pressing plate 36 is released, and the drive shaft 19 is allowed to rotate freely relative to the cylindrical body 35. It's getting old.

A pair of elongated holes 40 extending in the axial direction are bored at the ends of the cylindrical body 35 protruding from the connecting body 25 at positions shifted by 180 degrees in the circumferential direction. A connecting shaft 41 is inserted through this elongated hole 40, and this connecting shaft 41
One end of an arm 42 is connected to. That is, the cylindrical body 35 is connected to the arm 42 via the connecting shaft 41 so as to be slidable and rotatable according to the length of the elongated hole 40. The other end of the arm 42 of the first drive mechanism 8 is attached to the first floor plate 4
arm 4 of the second drive mechanism 8
The other end of 2 is pivotally connected to the lower surface of the third floor plate 6. Further, one end of a connecting rod 43 is pivotally attached to the lower surface of the fourth floor plate 7, and the other end is pivotally supported by the frame 2.

Note that the first drive mechanism 8 and the second drive mechanism 9 are different in that the directions of the threads formed on the screw shaft 13 are opposite.

Next, the operation of the above configuration will be explained. First, when rotating and raising the first floor plate 4, the screw shaft 13 of the first drive mechanism 8 is rotated counterclockwise using the handle 17. Then, drive shaft 1
9 tries to rotate together with the screw shaft 13 in the direction shown by arrow b in FIG.
Since the collar 28 and the pressing plate 36 pinch the friction member 38, this frictional resistance causes the drive shaft 1 to
9 is prevented from rotating. Therefore, the drive shaft 19
is driven in the axial direction indicated by the arrow c protruding from the support tube 10 without rotating. As a result, the cylindrical body 35
A connecting shaft 41 connecting the arm 42 and the arm 42 slides toward one end of the elongated hole 40 as shown by the chain line in FIG. Therefore, the propulsive force of the drive shaft 19 is transferred to the pressing plate 36.
is transmitted to the cylindrical body 35 via the cylindrical body 35.
is transmitted to the arm 42 via the connecting shaft 41. Therefore, since the arm 42 rotates, the first floor plate 4 is moved up as shown by the chain line in FIG. 1 in conjunction with this rotation.

When lowering the raised first floor plate 4,
Rotate the screw shaft 13 in the opposite direction. Until the first floor plate 4 is joined to the upper surface of the frame 2, the friction member 38 is moved between the second collar 28 and the pressing plate 36 by the weight of the first floor plate 4 and the biasing force of the spring 34.
Since the frictional force of the friction member 38 causes the drive shaft 19 to be coupled to the cylindrical body 35 and prevented from rotating idly together with the screw shaft 13, the drive shaft 19 is driven in the direction of entering the support cylinder 10. be done. The nut 18, which is integral with the drive shaft 19, is attached to the screw shaft 1.
Move to the stroke end of 3 and move to the first floor plate 4.
When joined to the upper surface of the frame body 2, the rotational resistance between the nut 18 and the screw shaft 13 becomes greater than the frictional resistance of the friction member 38, so that the connecting body 25 rotates with respect to the cylindrical body 35. That is, the drive shaft 19 begins to rotate together with the screw shaft 13 in the direction opposite to the arrow b. Therefore, the nut 18 will not bite into the screw shaft 13. Furthermore, when the nut 18 reaches the stroke end of the screw shaft 13, the connecting shaft 41 that connects the arm 42 and the cylindrical body 35 comes into contact with the other end of the elongated hole 40, as shown by the solid line in FIG. Then, the cylindrical body 35 is slid in the direction opposite to the arrow a against the biasing force of the spring 34. As a result, the clamping state of the friction member 38 between the second collar 28 and the pressing plate 36 is released. It rotates smoothly and prevents the nut 18 from biting.

In other words, even if the descending speed of the first floor plate 4 increases due to its own weight and the nut 18 reaches the stroke end of the screw shaft 13, this nut 18
rotates together with the screw shaft 13, so the screw shaft 13
It doesn't dig into the area. Moreover, since the end surface of the nut 18 contacts the sliding member 20 at the end of the stroke of the screw shaft 13, the nut 18 rotates smoothly.

On the other hand, the third floor plate 6 is moved by the second drive mechanism 9.
When raising the first floor plate 4, the screw shaft 13 is rotated in the same direction as when the first floor plate 4 is raised.
Then, since the screw threads of the screw shaft 13 of the second drive mechanism 9 are opposite to those of the screw shaft 13 of the first drive mechanism 8, the drive shaft 19 is driven in the direction of entering the support tube 10, and this drive shaft 19 The cylindrical body 35 rotates the arm 42 in conjunction with the movement. Therefore, the third floor plate 6 is rotated and raised by this arm 42 as shown by the chain line in FIG. Further, the fourth floor plate 7 is linked to the rotational rise of the third floor plate 6,
This fourth floor plate 7 is raised as shown by the chain line in the figure while rotating the connecting rod 43.

When lowering the third floor plate 6, the screw shaft 1
Rotate 3 in the opposite direction. When the nut 18 integrated with the drive shaft 19 moves to the stroke end of the screw shaft 13 and the third floor plate 6 is joined to the upper surface of the frame 2, the rotational resistance between the nut 18 and the screw shaft 13 is reduced. The frictional resistance increases more than the frictional resistance of the frictional member 38, and the drive shaft 19 is pushed together with the screw shaft 13 into the cylindrical body 3.
Starts to spin idly against 5. Therefore, as in the case of lowering the first floor plate 4, the drive shaft 19
Since the nut 18 is not prevented from rotating together with the screw shaft 13, the nut 18 is prevented from biting into the screw shaft 13.

Furthermore, when the drive shaft 19 rotates together with the coupling body 25 relative to the cylindrical body 35, the spring 34 attached to the slide collar 32 of the coupling body 25 can freely rotate together with the slide collar 32 relative to the shaft body 27. Therefore, this spring 34 does not become a rotational resistance of the drive shaft 19.

[Effect of idea]

As described above, according to this invention, a drive shaft having a nut that is screwed onto a screw shaft and a cylindrical body are connected by a connecting body that is provided integrally with the drive shaft and is rotatable with respect to the cylindrical body. At the same time, a friction member is provided between the cylindrical body and the connecting body to couple the two through frictional resistance by the biasing force of a spring. Therefore, if the floor plate is lowered and the nut integrated with the drive shaft reaches the stroke end of the screw shaft, and the resistance between them increases, the drive shaft will move against the frictional resistance of the friction member. Since the nut rotates idly relative to the cylindrical body, the nut is prevented from biting into the screw shaft. Moreover, the structure for this purpose is not only simple, but also reliable in operation.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention, with Figure 1 being a side view of the bed device, Figure 2 being a plan view, and Figure 3 being the threaded portion of the screw shaft of the drive mechanism and the nut. FIG. 4 is a sectional view of the connecting portion between the drive shaft and the cylindrical body. 4, 6... Floor plate, 13... Screw shaft, 18... Nut, 19... Drive shaft, 25... Connecting body, 26,
28...Brim, 34...Spring, 35...Cylindrical body, 36...Press plate, 38...Friction member, 42...
…arm.

Claims (1)

[Scope of utility model registration request] A connecting body having a rotationally driven screw shaft, a drive shaft having one end provided with a nut to be screwed onto the screw shaft, a pair of flanges having one end connected to the other end of the drive shaft; A cylindrical body that is slidably fitted onto the connecting body and has a pressing plate fixed therein located between the pair of flanges, and between one of the flanges located at one end of the connecting body and the pressing plate. an arm located on the other end side of the connecting body; and a spring provided between the other collar and the pressing plate, the spring biasing the connecting body in a direction in which the friction member is held between the one collar and the pressing plate. Bed device.