JPS6099214A - Rising type bed apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stand-up type bed which allows a part of the floorboard to be raised to an arbitrary angle.

Generally, this type of rise-up bed device 6 has a nut screwed onto a screw shaft that is rotatably driven, and a drive shaft is connected to this screw shaft. One end of the arm is pivotally connected to this drive shaft, and the other end of this arm is pivotally connected to a floor plate provided so as to be fully rotatable. By fully rotating the screw shaft and moving the nut along the direction of the screw shaft, the arm is fully rotated by the drive shaft, and the floor plate is interlocked with this.

According to such a structure, when the raised floorboard is completely lowered, the rate of descent becomes extremely fast due to the weight of the floorboard and the user's load applied to the floorboard. As a result, a large impact force is applied to the nut during the stroke P when the floorboard is lowered, causing the problem that the nut bites into the screw thread and the screw threads of both screws are stripped out.

In order to eliminate such drawbacks, Utility Model Publication No. 52-25365
- The one shown in the Q publication has been proposed.

According to this prior art, a screw is carved in the center of the rotating shaft, a threaded cylinder and a suppressing cylinder are loosely fitted to the rotating shaft, and a spring is fully installed between the rotating shaft and the pressing cylinder, and the above-mentioned A sliding tube is screwed onto the thread of the rotating shaft. A base plate (floor plate) is connected to this sliding tube via a connecting rod. and,
By rotating the rotating shaft and moving the sliding tube, the floorboard is rotated, and when descending, the sliding tube moves to l!
l! By easily moving the screw from the screw of the single rotation axis, the sliding cylinder is idled together with the screw cylinder against the rotation of the rotating shaft,
This is to prevent the threads from biting into the threads of the screw and the sliding tube.

However, such a structure requires a threaded cylinder that has a complicated shape and takes time and effort to process, resulting in lower productivity and higher costs. Further, since the thread of the rotating shaft and the thread of the thread are separated, it is difficult for the sliding tube to smoothly transition from a thin thread in one rotation to a thread Vζ in the threaded barrel.

In particular, since the threaded tube is loosely fitted to the rotating shaft, it is easy for looseness to occur between them, and if the threads of both screws are misaligned in the radial direction due to the looseness, the sliding tube may no longer shift. There is also a risk that the threads of the 4-pass moving cylinder and the threads of the threaded cylinder may become wedged during the transition.

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

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 l. This base body 1 is attached to a rectangular frame body 2 and to both ends of this frame body 2 in the longitudinal direction. - body 3. A first floor plate 4, a second floor plate 5, a third floor plate 6, and a fourth floor plate 7 are sequentially arranged on the frame 2 from one end in the longitudinal direction. The floorboard 5 of the bench 2 is fixed to the frame 2, and one end of the first floorboard 4 is pivotally connected to one end of the second floorboard 5. One end of the third floor plate 6 is pivotally attached to the other end of the floor plate 5 of this lA2, 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 operator's direction of the frame 2.

Above a, 1. The second drive mechanism 8.9 is constructed as shown in FIGS. 3-5. That is, 10 in FIG. 3 is a support cylinder. A bearing body 1 is provided in one end of this support cylinder 10.
A small diameter shaft portion 14 formed at one end of a screw shaft 13 is rotatably supported by a bearing 12 on this bearing body 1 . A cap 15 is fitted onto one end of the support tube 10, and this cap 15 is a character f1s.
The bearing body 1 is fixed by a screw 16 which passes through the peripheral wall of the bearing body 1 and engages with a locking hole 11a formed in the radial direction of the bearing body 1. A nondle 17 is connected to the small diameter shaft portion 14 protruding from the cap 15.

A nut 18 is screwed onto the screw shaft Z3. One end of a cylindrical drive shaft 11119 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 . A sliding member 20 made of a material with a low coefficient of friction, such as Teflon, is provided on an end surface of the bearing body 1 opposite to the end surface of the nut 18. A support member 2 is provided at the tip of the screw shaft 13 to abut against the inner circumferential surface of the drive shaft 19 and completely prevent the drive shaft 19 from swinging in the radial direction.

Furthermore, a plurality of bulges 22 are provided at the distal end of the support cylinder 10 and are in pressure contact with the outer peripheral surface of the drive shaft 19, and these bulges 22 prevent the drive l1l1119 from swinging in the radial direction.

A collar 25 is fitted onto the other end of the drive shaft 19, as shown in FIG. An inclined recess 26 having a slope 26ak that slopes low toward the end surface is formed at one end surface of the collar 25 at a position shifted by 180 degrees in the circumferential direction. The four inclined portions 26 are adapted to engage with both ends of a locking shaft 27, which is a protrusion provided in the radial direction of the drive shaft 19, and between the other end surface of the collar 25 and the drive shaft 19. A spring 29 is interposed between the collar 28 provided at the end, and the restoring force of the spring 29 causes the inclined recess 2 to
6 is pressed against the locking shaft 27. Upper eye picara-2
A connecting cylinder 30 is fitted onto the outside of the connecting cylinder 5 . This connecting cylinder 3
A pair of bins 3 are provided on the circumferential wall of No. 0 at positions shifted by 180 degrees in the circumferential direction. These bins 31td are respectively engaged with f-id grooves 32 bored in the collar 26 along the axial direction. In addition, the above-mentioned 's28
A plurality of bulges 33 are formed as abutting bodies by protruding a peripheral wall of a portion located between the collar 25 and the end of the collar 25 in the radial direction. The inner diameter of these bulging portions 33 is set to be smaller than the outer diameter of the collar 28. Further, a connecting shaft 34 serving as an abutting body is provided at the end of the connecting shaft 30 so as to face the end surface of the drive shaft 19 . One end of an arm 35 is pivotally attached to this connecting shaft 34.

The other end of the arm 35 of the second drive mechanism 8 is pivoted 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 raised, and It is pivoted to.

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 4Pt9, the inclined surface 26a of the four inclined parts 26 formed on the collar 25
The difference is that the direction of inclination of the screw shaft 3 and the direction of the thread formed on the screw shaft 3 are opposite to each other.

Next, the operation of the above configuration will be explained.

First, the first floor plate is rotated and raised by 4 feet. At +4 meeting,
The screw shaft 3 of the first drive mechanism 8 is rotated counterclockwise by the handle J7. Then, the drive shaft 19 tries to rotate together with the screw shaft 13 in the direction shown by the arrow a in FIG. 25. Therefore, the drive shaft 19 is driven in the axial direction indicated by the arrow projecting from the support tube 10 without rotating. When the drive shaft 19 is driven in the direction indicated by the arrow, its tip end presses the connection shaft 34, which is provided on the connection cylinder 30 and serves as a contact body. Then, since the arm 36 pivotally connected to the connection 41+34 rotates, the floor plate 4 of [1] is raised as shown by the chain line in FIG. 1 in conjunction with the rotation.

To lower the raised floor plate 4, rotate the screw shaft 13 in the opposite direction. The first floor plate 4
Since the connection 1134 is in pressure contact with the end of the drive shaft 19 due to the weight of the first floor plate 4 until it is joined to the upper surface of the frame 2, the drive shaft 19 is It is prevented from rotating together with the screw shaft 13 and is driven in the direction of entering the support tube 10. And drive shaft 1
When the nut 18 integral with the screw shaft 130 moves to the stroke end of the screw shaft 130 and the first floor plate 4 is joined to the upper surface of the frame 2, the rotational resistance between the nut J8 and the screw m13 increases, and the drive shaft 19 begins to rotate together with the screw shaft 13 in the direction opposite to the arrow a. Then, the locking shaft 2 provided on the drive shaft 19
7 slides on the slope 26a of the inclined recess 26, 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 1B does not bite into the screw shaft 13. In other words, even if the descending speed of the first floor &4 becomes faster due to its own weight and the nut 18 reaches the stroke end r of the screw shaft 13, this nut) J/?
Since the screw rotates together with the screw shaft 13, it does not bite into the screw shaft 13.

Furthermore, 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 with respect to the screw shaft J3.

When the third floor plate 6 is raised by the second drive mechanism 9, the screw shaft 13 of the second drive mechanism 19 is moved in the same direction as when the first floor plate 4 is raised. Rotate. Then, the screw fly 13 of the drive mechanism 9 of 'A2 is inserted into the first drive (the screw east of IJ3 (the screw thread is opposite to IJ3), so the drive shaft 19 enters the support 'i@j 10. At this time, since the 11th diagonal direction of the slope 26a of the 1st diagonal recess 26 formed on the collar 25 is also reversed, the locking shaft 27 and the 1st diagonal recess 26 are engaged with each other. When the drive shaft is moved, the collar 28 provided on the drive shaft 19 comes into contact with the bulge 33 as a contact body formed on the connecting tube 30, so the connecting tube 30 moves in conjunction with the movement of the drive shaft 19, and the arm 35. Therefore, the third floor plate 6 is rotated and raised by this arm 35 as shown by the chain line in FIG.

Moreover, the floor plate 7 of tA4 moves in conjunction with the rotational rise of the third floor plate 6, and the fourth floor plate 7 rises as shown by the chain line in the figure while fully rotating the connecting rod 36.

The screw shaft 13 of the platform for lowering the third floor plate 4 is rotated in the opposite direction. Until the floorboard 4 of rA3 is joined to the upper surface of the frame 2, the collar 28 and the bulge 33 are in pressure contact due to the weight of the third floorboard 4. 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. And, the seat 1 integrated with the drive shaft J9
8 moves to the stroke en P 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 J3 increases, and the drive shaft 19 It starts rotating with 13. Then, the locking shaft 27 provided on the drive shaft 19 engages the slope 2 of the inclined recess 26 of the collar 26.
6af, the collar 25 is displaced against the restoring force of the spring 29. Therefore, the drive shaft 19 is
Since the screw shaft 13 is not prevented from rotating with the screw shaft 13, the screw shaft 13 does not bite into the screw shaft 13.

Also, 1st. When the third floor plate 4.6 has finished lowering,
The locking shaft 27 is displaced by the collar 25 and the ILII recess 26
The operator can confirm that the floorboards 4 and 6 have finished lowering because the change in rotational resistance of the handle 170 and the sound of engagement and disengagement are transmitted to the operator.

As described above, the present invention provides a screw shaft that is rotatably driven and is provided at one end of the drive shaft.

The other end of the drive shaft is provided with a contact body that presses against the drive IIt11 against the axial movement of the drive shaft. The movable floor plate is pivotally connected by an arm, and when rotated in the rotational direction between the connecting cylinder and the drive 1 pongee, the drive shaft engages with the protrusion provided on the drive shaft, causing the drive shaft to screw. Provided with four inclined parts that prevent the screw shaft from rotating together with the shaft and disengage from the projection when the screw shaft is rotated in a direction that completely lowers the floor plate, and in a direction in which the four inclined parts come into pressure contact with the projection. The collar was biased with a spring. Therefore, even if the screw shaft is rotated after the floor plate is lowered and the nut reaches the stroke end of the screw shaft, the above protrusion and
Since the drive shaft is disengaged from the φ oblique recess and rotates together with the screw shaft, it is possible to prevent the nut from biting into the screw fly and damaging these screw threads.

Furthermore, the configuration of the mechanism for rotating the drive shaft together with the screw shaft is not only simple, but also works well.

[Brief explanation of drawings]

The drawings fully show an embodiment of the present invention, and FIG. 1 is a side view of the bed device, FIG. The figure is also a cross-sectional view of the connecting portion between the drive shaft and the connecting cylinder, and FIG. 5 is a cross-sectional view taken along the line ■-■ in FIG. 4. 4.6...Floor plate, 13...Screw shaft, J8...S,
J9... Drive shaft, 25... Collar, 26...
Inclined recess, 27... Locking shaft (protrusion), 29... Spring, 30... Connecting cylinder body, 33... Swelling part (contact body),
34... Connection shaft (contact body), 36... Arm.

Claims (1)

[Claims] The screw 1jii1 that is rotationally driven and the side that screws into this screw shaft are provided on the -☆1i11 part! III shaft, the other end of this sounding shaft (a connecting cylinder fitted externally,
A contact body is provided on the connecting cylinder and presses against the drive shaft when the 1g driving shaft moves in 11 directions, and one end is pivotally connected to the connecting face body, and the other end rotates the ped device 4. An arm pivotally attached to a freely provided floorboard, a collar provided between the i% knot body and the drive shaft to prevent movement in the rotational direction, and #a 1f11 of this collar.
When the screw shaft is rotated in the direction of raising the floor plate, the above: Mb! The drive shaft rotates together with the screw shaft by engaging with the protrusion provided on the gIl shaft.
r 1411 The four oblique portions of the locking screws 1 that come out of engagement with the protrusions when the screws 1 are rotated in the direction of lowering the floor plate τ, and the Saturday and Sunday collars are moved in the direction in which the inclined concave portions press against the protrusions. A rise-up bed device that is fully equipped with a biased spring.