JPS6312610B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rise-up bed device that allows a part of the floorboard to be raised to any desired angle.

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 the 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.

This invention has been made based on the above circumstances, and its object is to provide a rise-up bed that can reliably prevent biting between screws on the drive side and screws on the driven side with a simple configuration. The goal is to provide equipment.

An embodiment of the present invention will be described below with reference to the drawings. The bed device shown in FIG. 1 includes a base 1. The bed device shown in FIG. This base body 1 includes a rectangular frame body 2 and boat bodies 3 attached to both longitudinal ends of this frame body 2.
It is composed of. The frame 2 has a first floor plate 4, a second floor plate 5, and a third floor plate from one end in the longitudinal direction.
A floor plate 6 and a fourth floor plate 7 are sequentially arranged. 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 to 5. 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 is connected to the small diameter shaft portion 14 protruding from the cap 15.

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 integrally connected to the nut 18 . The above bearing body 1
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 first 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 1
A plurality of bulges 22 are provided at the tip of the drive shaft 19 in pressure contact with 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 collar 25 is fitted onto the other end of the drive shaft 19, as shown in FIG. This color 25
An inclined recess 26 having a slope 26a that slopes low toward the end surface is formed at a position shifted by 180 degrees in the circumferential direction on one end surface. The inclined recess 26 is adapted to engage with both ends of a locking shaft 27, which is a protrusion that extends through the drive shaft 19 in the radial direction. The other end surface of the collar 25 and the drive shaft 1
A spring 29 is provided between the collar 28 provided at the end of the
is interposed, and the restoring force of the spring 29 presses the inclined recess 26 against the locking shaft 27. A connecting cylinder 30 is fitted onto the collar 25. The peripheral wall of this connecting cylinder 30 has a
A pair of pins 31 are provided at positions shifted by 180 degrees. These pins 31 are respectively engaged in guide grooves 32 bored in the collar 25 along the axial direction. Further, the connecting cylinder 30 is formed with a plurality of bulges 33 as abutting bodies, which are formed by protruding a peripheral wall of a portion located between the collar 28 and the end surface of the collar 25 inward in the radial direction. There is. The inner diameter of these bulging portions 33 is set smaller than the outer diameter of the collar 28. Furthermore, a connecting shaft 34 serving as an abutting body is provided at the end of the connecting cylinder 30 so as to face the end surface of the drive shaft 19 . This connecting shaft 3
One end of an arm 35 is pivotally attached to 4. 1st
The other end of the arm 35 of the drive mechanism 8 is pivotally attached to the lower surface of the first floor plate 4, and the other end of the arm 35 of the second drive mechanism 9 is pivotally attached to the lower surface of the third floor plate 6. There is. Further, one end of a connecting rod 36 is pivotally attached to the lower surface of the fourth floor plate 7, and the other end of the connecting rod 36 is pivotally supported by the frame 2.

Note that in the first drive mechanism 8 and the second drive mechanism 9, the direction of inclination of the inclined surface 26a of the inclined recess 26 formed in the collar 25 is opposite to the direction of the thread formed in the screw shaft 13. They differ in that they are

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 a in FIG. thwarted. Therefore, the drive shaft 19 is driven in the axial direction indicated by the arrow b protruding from the support tube 10 without rotating. When the drive shaft 19 is driven in the direction of the arrow b, its tip end presses the connection shaft 34, which serves as an abutting body provided on the connection cylinder 30. Then, the arm 35 pivotally connected to the connecting shaft 34 rotates, and 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 connecting shaft 34 is in pressure contact with the end face of the drive shaft 19 due to the weight of the first floor plate 4, so the friction caused by the pressure contact The force prevents the drive shaft 19 from rotating together with the screw shaft 13 and drives it in the direction of entering the support tube 10. When the nut 18 integrated with the drive shaft 19 moves to the stroke end of the screw shaft 13 and the first floor plate 4 is joined to the upper surface of the frame 2, the rotational resistance between the nut 18 and the screw shaft 13 is reduced. increases, and the drive shaft 19 begins to rotate together with the screw shaft 13 in the direction opposite to the arrow a. Then, drive shaft 1
The locking shaft 27 provided at the spring 29 slides on the slope 26a of the inclined recess 26, displacing the collar 25 against the restoring force of the spring 29. Therefore, the drive shaft 1
9 is not prevented from rotating together with the screw shaft 13, the nut 18 does not bite into the screw shaft 13. 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, the nut 18 rotates together with the screw shaft 13, so that the screw shaft It never gets into 13. 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, rotation with respect to the screw shaft 13 is performed 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 of the second drive mechanism 9 is rotated in the same direction as when the first floor plate 4 is raised. Then, since the threaded shaft 13 of the second drive mechanism 9 has a thread opposite to that of the threaded shaft 13 of the first drive mechanism 8, the drive shaft 19 is driven in the direction of entering the support tube 10. At this time, color 2
Since the direction of inclination of the slope 26a of the slope recess 26 formed in 5 is also opposite, the locking shaft 27 and the slope recess 26
By engaging with the drive shaft 19, the drive shaft 19 is driven without rotating. When the drive shaft 19 is driven in the direction of entering the support tube 10 in this way, the collar 28 provided on the drive shaft 19 hits the bulge 33 as an abutting body formed on the connection tube 30. The connecting cylinder 30 rotates the arm 35 in conjunction with the movement of the drive shaft 19. Therefore, the third floor plate 6 is rotated and raised by this arm 35 as shown by the chain line in FIG. In addition, the fourth floor plate 6 is rotated upward.
The fourth floor plate 7 is connected to the connecting rod 3.
While rotating 6, it rises as shown by the chain line in the figure.

When lowering the third floor plate 4, the screw shaft 1
Rotate 3 in the opposite direction. Until the third floorboard 4 is joined to the upper surface of the frame 2, the flange 28 and the bulge 33 are in pressure contact with each other due to the weight of the third floorboard 4, so the frictional force due to the pressure contact between them is At this point, the drive shaft 19 is prevented from rotating together with the screw shaft 13, and is driven in the direction of being extracted from the support tube 10. A nut 18 integral with the drive shaft 19
When the screw shaft 13 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 increases, and the drive shaft 19 moves along with the screw shaft 13. It begins to rotate. Then, the locking shaft 27 provided on the drive shaft 19 slides on the slope 26a of the inclined recess 26 of the collar 25, displacing the collar 25 against the restoring force of the spring 29. Therefore, since the drive shaft 19 is not prevented from rotating together with the screw shaft 13,
The nut 18 will not bite into the screw shaft 13.

Furthermore, when the first and third floor plates 4 and 6 finish lowering, the collar 25 displaces the locking shaft 27 and engages and disengages from the inclined recess 26, so that the rotational resistance of the handle 17 due to the engagement and disengagement is reduced. Since the change and engagement sound are transmitted to the operator, the operator can confirm that the floorboards 4 and 6 have finished lowering.

As described above, the present invention has a nut provided at one end of the drive shaft that is screwed into a screw shaft that is rotatably driven, and a nut provided at one end of the drive shaft that is driven to rotate in response to the axial movement of the drive shaft. A connecting cylinder provided with an abutting body that presses against the shaft is fitted onto the outside, and this connecting cylinder and a rotatable floor plate are pivotally connected by an arm, and a rotating cylinder is connected between the connecting cylinder and the drive shaft. A collar is provided on the end face of the collar to prevent movement in the direction, and when the screw shaft is rotated in the direction of raising the floor plate, it engages with a protrusion provided on the drive shaft so that the drive shaft screws up. An inclined recess is provided which prevents the screw shaft from rotating together with the shaft and disengages from the protrusion when the screw shaft is rotated in a direction to lower the floor plate, and the inclined recess is arranged in a direction in which the inclined recess comes into pressure contact with the protrusion. The collar was biased with a spring. Therefore, even if the floor plate is lowered and the nut reaches the stroke end of the screw shaft and then the screw shaft is rotated, the projection and the inclined recess are disengaged and the drive shaft rotates together with the screw shaft. This prevents the nut from biting into the screw shaft and damaging these screw threads. Furthermore, the structure for rotating the drive shaft together with the screw shaft is not only simple, but also reliable in operation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of the bed device, Fig. 2 is a plan view, and Fig. 3 is a side view of the bed device.
The figure is a cross-sectional view of the threaded part between the screw shaft and the nut of the drive mechanism, Figure 4 is a cross-sectional view of the joint part between the drive shaft and the connecting cylinder, and Figure 5 is a cross-section taken along the line V-V in Figure 4. It is a diagram. 4, 6... Floor plate, 13... Screw shaft, 18... Nut, 19... Drive shaft, 25... Collar, 26...
... Inclined recess, 27 ... Locking shaft (protrusion), 29 ...
Spring, 30...Connection cylinder, 33...Bulging part (contact body), 34...Connection shaft (contact body), 35...Arm.

Claims (1)

[Claims] 1. A screw shaft that is rotationally driven, a drive shaft that has a nut screwed onto the screw shaft at one end, a connecting cylinder that is externally fitted on the other end of the drive shaft, and a connecting cylinder that is fitted onto the other end of the drive shaft. an abutting body that is provided and presses against the drive shaft in response to axial movement of the drive shaft; and a floor plate that has one end pivotally connected to the connecting cylinder and the other end that allows the bed device to rotate freely. an arm pivotally connected to the arm; a collar provided between the connecting cylinder and the drive shaft to prevent movement in a rotational direction; and a screw shaft formed on an end surface of the collar that raises the floor plate. When the screw shaft is rotated in a direction, the screw shaft engages with a protrusion provided on the drive shaft to prevent the drive shaft from rotating together with the screw shaft, and when the screw shaft is rotated in a direction to lower the floor plate. A rise-up type bed device comprising: an inclined recess that disengages from the protrusion; and a spring that biases the collar in a direction in which the inclined recess comes into pressure contact with the protrusion.