Telescopic bed with variable lifting system

Abstract

The invention relates to a retractable bed with a mechanical system for variable height. According to the invention, the bed comprises a system consisting of two assembled, substantially identical columns (A and A ') in which a screw (9) is driven by each of them by means of an electric motor (5), each rod (9) driving an assembled universal carriage (B) movable within the assembled columns (A and A'), the assembled universal carriage (B) being able to raise and lower the bed frame (C) and the table positioning means (E), and the bed frame (C) is provided with two folding mechanisms (D).

Description

Technical Field

[0001] The present invention relates to a telescopic bed with a variable height system, the telescopic bed consisting of a bed frame attached to a mechanical system having two universal sliding carriages operated by vertical threaded shafts, each of which is simultaneously driven by an electric motor. Background Technology

[0002] According to invention US2002046423, a retractable bed with a drive belt is known, comprising a vertically adjustable bed frame and a traction device for moving the bed frame in the vertical direction. The bed includes two carriages fixed to the end faces of the bed frame, spaced horizontally apart. Each carriage is supported such that it can move on a vertical guide rail by means of rollers. Each carriage is connected to a counterweight via a toothed traction chain or toothed belt, and each traction chain or toothed belt is guided on a drive wheel at the upper end of its respective guide rail; the drive wheels are rigidly connected by a connecting rod. The connecting rod is connected to a main roller, which is vertically interconnected with a counter-drum via a drive belt; the drive belt drives the rotation of the connecting rod; and the counter-drum is selectively driven in one direction or the other by means of a motor coupled to a reduction gear. A disadvantage is that the auxiliary drive assembly and the winch-drum-motor assembly are relatively large and protrude from the bed frame, occupying valuable space.

[0003] We also know of a vertically retractable bed that requires an attic or double ceiling with a weighted pulley system (similar to the system used in garage doors) that allows the user to easily raise the bed to the ceiling and pull it down to floor height if needed.

[0004] (www.google.ro / search?q=pat+retractable+to+the+ceiling&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwj-I6awqIHgAhAhUOaFAKHSZwAgQQsAR6BAgFEAE&biw=1366&bih=608#imgrc=B_X4kwZ5-NYAyM:). Its disadvantages are: i) it requires space outside the ceiling, or a high ceiling where the traction device can be installed; ii) the support element is an elastic band of special fabric or support cable, which necessitates the use of sturdy support legs.

[0005] Another type of vertically extendable bed is known, wherein the bed is situated on a platform assembled to a trolley lifting mechanism consisting of supports fixed to a wall. The roller trolley can be raised or lowered via a pulley system driven by an electric motor located on one side of the bed and typically concealed within a double-walled structure. The disadvantage is the use of additional space, which reduces the usable space.

[0006] A common drawback of mechanical or electrically operated systems for vertically retractable beds is that the construction sometimes requires a considerable amount of installation space, which can be determined by the height of the room, the thickness of the mounting wall, or the width of the mounting wall.

[0007] Also known is a retractable bed with a mechanical system for variable height, as described in patent RO 134297 A2, which can be located anywhere in an enclosed space. The bed comprises a bed frame and a mechanical support and actuation system consisting of two identical assembly columns, each with a support column spaced parallel to each other at a distance approximately the width of the bed. An assembled transverse member is fixed to the upper end of each column, on which an electric motor is mounted. This electric motor simultaneously drives two threaded assemblies mounted in each support column via a drive belt. Special nuts are precisely and symmetrically screwed onto these threaded assemblies. Each nut drives a carriage having rollers running on and within the support columns. The carriage is secured to the wall of an enclosed space on one hand by known fasteners (e.g., bolts or pins), and on the other hand by slots extending along its entire vertical axis, allowing flanges fixed to the upper conventional components of the bed frame to be fitted into two slots provided on each roller carriage. Thus, upon command, the electric motor simultaneously drives the two threaded assemblies via the drive belt. These threaded assemblies force the special nuts upward or downward through their threads, thereby driving the roller carriages (by thrust when moving upward, and by gravity when moving downward), and thus driving the bed frame.

[0008] The main drawback of this invention is:

[0009] - During operation, the use of drive belts and rollers will generate vibration and noise. - During operation, the locking of the translation nut on the bolt cannot be controlled because it is impossible to correlate the execution tolerance of the translation carriage assembly with the execution tolerance of the bolt / translation nut assembly, making it possible for at least one of the translation nuts to lock, thereby suspending the bed while the electric motor is forced to run because it cannot be shut down according to the command given by one of the stroke sensors. Summary of the Invention

[0010] The technical problems solved by the present invention are: a) eliminating vibration and noise in a small effective installation space of the actuation and lifting mechanism, and b) eliminating random locking of the translation nut on the actuation screw.

[0011] The advantages of this invention are that it achieves a compact and small-volume, reliable, quiet and safe actuation and lifting mechanism. Attached Figure Description

[0012] Embodiments of the present invention are given below with reference to the following accompanying drawings, which illustrate: Figure 1.1 , 1.2 1.3, 1.4 - Panoramic view of the assembled telescopic bed with a variable height system; Figure 2 - Figure 1.1 Details in U; Figure 3 - Figure 1.1 Details T in the text; Figure 4 - Side view of the lower part of the assembled telescopic bed with a variable height system; Figure 5 , Figure 6 - Top view of the column area of ​​the assembled telescopic bed with a variable height system; Figure 7 - Side view of the assembled telescopic bed with a variable height system; Figure 8 - A side view of the lower part of the assembled telescopic bed with a variable height system, showing the assembled carriage B; Figure 9 - ZZ section view of the assembled column A; Figure 10.1 , Figure 10.2 - View of the assembled carriage B; Figure 11.1 , Figure 11.2 - Frame assembly - Top view and isometric view of the translation nut; Figure 12.1 , Figure 12.2 , Figure 12.3 , Figure 12.4 -Isometric views of the folding mechanism D in its lowered state, including overall, partial, and detailed views; Figure 13.1 , Figure 13.2 , Figure 13.3 , Figure 13.4 - Isometric views of the folding mechanism D in its raised state, including overall, partial, and detailed views; Figure 14.1 , Figure 14.2 - Front and side views of the worktable positioning device E; Figure 15.1 ... Figure 15.7- Overall, partial and detailed isometric views of the worktable positioning device E in the lowering and raising states and the folding mechanism D in the lowering and raising states; Figure 16 - The indexing of the worktable positioning device E is explained. Detailed Implementation

[0013] The telescopic bed with a variable height mechanical system according to the present invention includes ( Figure 1.1 , Figure 1.2 , Figure 1.3 , Figure 1.4 , Figure 2 The system consists of two nearly identical assembly columns A and A'. Within these columns, an assembled universal carriage B is driven by an electric motor 5 and a screw 9. The carriage B operates within the assembled columns A and A'. The assembled universal carriage B can raise and lower the bed frame C and the worktable positioning device E. The bed frame C is equipped with two folding mechanisms D. - Assembled columns A and A' Figure 1.1 , Figure 1.2 , Figure 1.3 , Figure 1.4 ), Columns A and A' consist of wall-mounted panels 1 and 1' respectively, spaced parallel to each other at an appropriate distance (approximately the width of the bed). - These panels are secured to the wall by fasteners not shown in the figure - Supporting columns 2 and 2' are detachably mounted on each of them; the supporting columns are assembled sequentially on each supporting column from the bottom up ( Figure 2 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 8 The lower cover 3 is detachably fixed to the support columns 2 and 2' respectively, and the radial bearing 4 (not shown in the figure) is assembled in the lower cover 3; the electric motor 5 is fixed to the lower cover 3 by double threaded left / right studs 6; the electric motor 5 drives the special shaft 7 ( Figure 4 , Figure 8 The threaded rod 9 is axially assembled onto the special shaft 7 via the flexible coupling 8. The other end of the threaded rod 9 is fixed in the pressure bearing 10 (not shown in the figure). The pressure bearing 10 is fixed in the upper cover 11 and detachably fixed to the upper end of the load-bearing column 2. (See the cross-sectional view...) Figure 9 In this structure, each load-bearing column 2 or 2' has a load-bearing structure in the longitudinal direction. a Two lower running tracks b and two upper running tracks b’ Used for assembled carriage rollers B; running track c ; running track c They are arranged longitudinally symmetrically on the running track, facing the wall-mounted panels 1 and 1' respectively. b’Above, two rolling grooves d are arranged symmetrically longitudinally toward the bed frame C, and several threaded holes are present. e Arranged at the ends, the lower cover 3 and the upper cover 11 are fixed therein; at the upper end, two assembled pillars A and A' are assembled facing the interior mirror image of the component; each limiting block 37 and 38 ( Figure 14.1 , Figure 14.2 () Fixed at the same height.

[0014] - In each assembled column A and A', there is an assembled universal carriage B ( Figure 9 , Figure 10.1 , Figure 10.2 , Figure 11.1 , Figure 11.2 The structure includes a load-bearing body 12. At the lower end of the load-bearing body 12, a pair of rollers 14' can be mounted on a lower shaft 13. The lower shaft 13 is fixed to the two lower arms of the body 12. f In the middle; and at the upper end, a pair of rollers 14' can be assembled onto the upper shaft 13', which is fixed to the two upper arms of the main body 12. g In the middle; bolt 15' is detachably fixed to the lower part of the upper shaft; A universal joint consisting of two hinges 17 and 18 is rotatably attached to the load-bearing body 12 via two bolts 16, above the roller 14. The other end of this joint is rotatably attached to a frame 20 via two identical bolts 19 arranged axially. In the given example, the frame 20 is rectangular, and a translation nut 21, engaging with a screw 9, is inserted into the frame 20 with a gap. Two identical guide rollers 22 and 23 are arranged at 90 degrees on the frame 20 and axially mounted on either side of the frame. The shafts 24 and 25 of the guide rollers are fixedly mounted in the frame 20 and the translation nut 21, respectively. The assembly of the frame 20 and the translation nut 21 can be connected to the load-bearing body 12 via cutouts in the hinge mounts 17 and 18. k The guide roller 22 moves smoothly, allowing it to be fitted with a small gap onto the upper arm of the load-bearing body 12. g Between; another guide roller 23 is on the support column 2 or 2' ( Figure 9 The raceway in ) c The middle is guided.

[0015] - The arm is assembled on each assembled carriage B via bolts 15 and shaft 13. f and g Between them, hook / fix a plate 24 in an "L" shape. Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 Bed frame C ( Figure 1.1 , Figure 1.3 , Figure 7The bed frame C is fixed to two plates 24 on two assembled carriages B. The bed frame C consists of rigidly assembled load-bearing elements, which in our example are “L” shaped cross-section profile frames, commonly referred to as: upper frame 25, right frame 26, lower frame 27, left frame 28 and “T” shaped cross-section middle profile 29. All of these are fixed to each other by collars and known assembly members not mentioned in the figure. All of these are assembled in such a way that one or two mattresses (not shown in the figure) are assembled between the two plates 24.

[0016] - On the upper part of each plate 24, a U-shaped trajectory is machined. n ( Figure 15.3 ) - To those with supporting legs 30 and 31 ( Figure 1.3 On the lower side of the bed frame C, support legs 30 and 31 can be folded in a mirror manner toward the inside of the bed frame via a folding mechanism D. The folding mechanism D includes a thin rod 32 on the right side of the bed, with a lug 33 at its upper end located on the outside of the bed frame C. The lug 33 has a hole h oriented to the upper right. A support foot 30 is located at the lower end inside the bed frame C and is assembled to the rod 32 by a special screw 36. The rod 32 is assembled to the right frame 26 via at least two cylindrical sliding adjustment connectors 35 fixed to the right frame 26. On the left side of the bed, the folding mechanism D includes an elongated rod 32, with a lug 34 at its upper end (located on the outside of the bed frame C). The lug 34 has a pin pointing upwards to the left. m The lower end (located on the inside of the bed frame C) has a support leg 31, which is assembled to the rod 32 by special screws 36; the rod 32 is assembled to the left frame 28 by at least two cylindrical sliding fit connectors 35 fixed to the right frame 28. - On each of the load-bearing columns 2 and 2', limiting blocks 38 and 37 are fixed at the same height from the top inwards respectively. Figure 13.2 , Figure 13.4 , Figure 14.1 , Figure 14.2 ); - Workbench positioning device E( Figure 14.1 , Figure 14.2 , Figure 15.1 , Figure 15.2 , Figure 15.3 , Figure 15.4 , Figure 15.5 , Figure 15.6 , Figure 15.7The assembly consists of two identical L-shaped support members 39, which are slidably inserted and fixed by bolts 50. The bolts 50 are equidistantly positioned between two identical strips 40. The external dimensions of these two strips 40 are calculated such that they can be assembled from bottom to top onto a lower shaft 41 using rollers 42, onto an intermediate shaft 43 using rollers 42, and onto two coaxial upper half-shafts 44 and 45 using rollers 42. The half-shafts 44 and 45 are fixed in such a way that when assembled, the plate 24 can slide freely between the strips 40. The support member 39 is assembled between the lower shaft 41 and the intermediate shaft 43. The rollers 42 assembled on the shafts and half-shafts can roll on the bearings. d ( Figure 9 Slide in, roll seat d The support members 39 are arranged longitudinally symmetrically in each load-bearing column 2, 2'; the support member 39 has several recesses on the side facing the upper bed frame 25. s ( Figure 16 These recesses are cut on the upper side of the bed frame 25 to adjust the height of the workbench according to the operator's height; - In the "lower" position of bed frame C ( Figure 14.1 The lower shaft 41 with roller 42 is not in the roller groove. d In the middle, the intermediate roller shaft 43 with roller 42 and the two coaxial upper half shafts 44 and 45 with roller 42 respectively are in the roller groove. d In the middle; on the outer side of the belt 40, an assembly consisting of two identical blades 46 is installed. The blades 46 are fixed to the spacer 47 at the bottom, and an indexing screw 48 can be inserted into the spacer 47. The blades 46 are fixed at the top by a spindle 49 with a roller 42, which can be located in the rolling seat. d In this process, by using the indexing screw 48 on the spacer 47, the assembly with roller 42 and belt 40 can be easily raised or lowered by sliding in the support columns 2, 2'. - On two identical supports 39, the horizontal plate can be assembled in an L-shape as a worktable (not shown in the figure).

[0017] Working principle: With the simultaneous operation of the two motors 5, the two screws 9 begin to rotate, driving the translation nut 21. The translation nut 21 drives the two assembled universal carriages B via cams 17 and 18. The universal carriages B begin to slide upward in the two support columns 2 and 2', driving the plate 24 via bolts 15 and shaft 13. The bed frame C is assembled on the plate 24. At a given moment, during the upward movement, the plate 24 hooks onto the shaft 49, and the roller 42 is in the groove. n In the middle, the roller is forced into the rolling groove. dThe rolling grooves d are arranged longitudinally and symmetrically in the support columns 2 and 2', respectively, and when the indexing screw 48 reaches the first bolt 50 above it, it will start to drive the worktable positioning device E upward.

[0018] The upward movement will continue until one of the universal joints B in the assembled universal joint contacts the connector (not shown in the figure), which is used to stop both electric motors 5 at the same time.

[0019] When descending, the phenomenon is exactly the opposite: screw 9 rotates in the opposite direction, forcing the assembled universal joint B to descend, while simultaneously driving the bed frame C and the worktable positioning device E.

[0020] In the assembled universal carriage B, the sub-assembly consists of a load-bearing body 12, hinges 17 and 18, a frame 20, and a translation nut 21. The translation nut 21 engages with the screw 9, and the guide roller 22 is located on the upper arm of the load-bearing body 12. g Sliding between; in the load-bearing column 2 or 2' ( Figure 9 Another guide roller 23, which is guided in the rolling path c, acts as a universal joint, eliminating the possibility that the translation nut 21 will lock onto the screw 9 during the tightening motion.

[0021] In the "lowered" position of the bed, legs 30 and 31 stand upright due to gravity, and the bed rests on them; When both electric motors 5 are operated simultaneously, feet 30 and 31 remain in a vertical position until near the end of the vertical stroke, at which point the claws of the two levers 33 and 34... g and h Reaching limit blocks 38 and 37 respectively Figure 13.2 , Figure 13.4 , Figure 14.1 , Figure 14.2 Limiting blocks 38 and 37 are fixed on the support columns 2 and 2' respectively; the bed frame C continues to move, and the limiting blocks 38 and 37 act on the levers 33 and 34 respectively, and force the legs 30 and 31 to rotate and fold under the bed frame 27 through the thin rod 32; During the descent, the phenomenon is exactly the opposite; once the bed begins to descend, legs 30 and 31 descend to an upright position. When horizontal control is required, the bed frame C and the worktable device E can be equipped with symmetrical bolt angle adjustment mechanisms at the bottom.

[0022] literature - US2002046423 - EN 134297 A2 -www.google.ro / search?q=pat+retractable+to+the+ceiling&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwj-I6awqIHgAhAhUOaFAKHSZwAgQQsAR6BAgFEAE&biw=1366&bih=608#imgrc=B_X4kwZ5-NYAyM:)

Claims

1. A retractable bed with a variable height system, characterized in that, The retractable bed comprises (Figures 1.1, 1.2, 1.3, 1.4, 2) a system consisting of two substantially identical assembled columns (A and A'), within which, by means of an electric motor (5), screws (9) are driven by each of them, each of which drives an assembled universal carriage (B) that moves within the assembled columns (A and A'), the assembled universal carriage (B) being able to raise and lower the bed frame (C) and the worktable positioning device (E), the bed frame (C) being provided with two folding mechanisms (D); the assembled columns (A and A') (Figures 1.1, 1.2, 1.3, 1.4) comprise wall-mounted panels (1 and 1', respectively) spaced parallel to each other at an appropriate distance (approximately the width of the bed) – the panels being fixed to the wall by a known assembly device – and load-bearing columns (2 and 2', respectively) being detachably mounted on each of them; The load-bearing columns (2 and 2' respectively) are assembled on each load-bearing column (Fig. 2, 3, 4, 5, 8). Starting from the bottom, there is a lower cover (3) detachably fixed to the load-bearing column (2 and 2' respectively), in which a radial bearing (4) is assembled; an electric motor (5) is fixed to the lower cover (3) by double-threaded left / right threaded left / right studs (6); the electric motor (5) drives a special shaft (7) (Fig. 4, 8), which is axially assembled to the special shaft (7) by a flexible coupling (8). The screw (9) is axially assembled to the special shaft (7) by a threaded coupling (8). The other end of the threaded coupling (8) is fixed in a pressure bearing (10), which is fixed in a top cover (11). The top cover (11) is detachably fixed to the upper end of the load-bearing column (2); in the cross section (Fig. 9), each load-bearing column (2 or 2') has a longitudinal load-bearing structure ( a ), and two lower conventional raceways for the assembled carriage rollers (B) b ) and two upper conventional raceways ( b’ ), relative to the raceway ( b’ ) longitudinally symmetrical raceways c The lower cover (3) and the upper cover (11) are fixed therein, typically facing the wall-mounted panel (1, 1'), with two rolling grooves (d) arranged longitudinally symmetrically towards the bed frame (C), and several threaded holes (e) arranged at the ends; at the upper end, two assembled columns (A and A') are assembled in a mirror image facing the interior of the assembly; each limiting block (37 and 38) (Fig. 14.1, Fig. 14.2) is fixed at the same height; In each assembled column (A and A'), an assembled universal carriage (B) can be transposed (Figs. 9, 10.1, 10.2, 11.1, 11.2); including a load-bearing body (12), at the end of which a pair of rollers (14) can be mounted on a lower shaft (13), the lower shaft (13) being fixed to the two lower arms of the load-bearing body (12). f In the structure, a pair of rollers (14') are mounted on two upper arms fixed to the load-bearing body (12). g On the upper shaft (13') of the roller (14); bolts (15) are detachably fixed below the upper shaft; on the load-bearing body (12) above the roller (14), two bolts (16) and two hinges (17 and 18) are rotatably attached at one end and rotatably attached at the other end to two axially arranged bolts (19), which are fixed in a frame (20), which may be rectangular, and a nut (2) is translated inside the frame. 1) Engages with the screw (9); two identical guide rollers (22 and 23) are axially mounted on either side of the frame (20) at a 90-degree angle to the frame (20), and the shafts of the frame (20) (24 and 25, respectively) are fixedly mounted in both the frame (20) and the translation nut (21); during assembly, the load-bearing frame (20) and translation nut (21) assembly can be positioned at the hinges (17 and 18) through a cut in the load-bearing body (12). k The guide roller (22) moves intermittently within the upper arm of the load-bearing body (12) with a small gap, allowing the guide roller (22) to enter the upper arm of the load-bearing body (12) with a small gap. g Between; the other guide roller (23) is guided in the raceway (c) of the support column (2 or 2') (Fig. 9); In the assembled universal carriage (B), the sub-assembly consists of the load-bearing body (12), the hinges (17 and 18), the frame (20), and the translation nut (21) that meshes with the screw (9). The guide roller (22) is located on the upper arm of the load-bearing body (12). g Sliding between the support columns (2 or 2′) (Fig. 9); the other guide roller (23) guided in the rolling path (c) of the support column (2 or 2′) (Fig. 9) acts as a universal joint, eliminating the possibility that the translation nut (21) will get stuck on the screw (9) during the tightening movement; From bolts (15) and shafts (13), assemble them on the arm ( f and g Between them, an "L"-shaped plate (24) (Figures 2, 4, 5, 6, 7, 8) is hooked / fixed to each assembled carriage (B); The bed frame (C) (Figs. 1.1, 1.3, and 7) is made of rigidly assembled load-bearing elements, which in our example are "L"-shaped cross-section profile frames, referred to as: top frame (25), right side frame (26), bottom frame (27), left side frame (28), and "T"-shaped cross-section middle profile (29), all of which are fixed to each other by collars and known self-assembly components, all of which are assembled to allow one or two mattresses to be placed between them; on the upper part of each board (24), a "U"-shaped position is machined ( n (Fig. 15.3); Some support legs (30 and 31) (Fig. 1.3) are assembled to the lower part of the bed frame (C). These support legs can be folded inwards towards the bed frame via a folding mechanism (D), which includes a thin rod (32) on the right side of the bed. The thin rod (32) has a lug (33) at its upper end on the outside of the bed frame (C). The lug has a pin positioned towards the upper right. h ); and a support foot (30) located at the lower end inside the bed frame (C), the support foot (30) being assembled to the rod (32) by special screws (36); the rod (32) being assembled to the right side frame (26) by at least two cylindrical sliding adjusting couplings (35) fixed to the right side frame (26); the folding mechanism (D) includes an elongated rod (32) on the left side of the bed, having a guide (34) at its upper end located outside the bed frame (C), the guide (34) having a pin pointing upward to the left ( m ); and the lower end located inside the bed frame (C), which is assembled to the support foot (31) of the rod (32) by special screws (36); the rod (32) is assembled to the left frame (28) by at least two cylindrical sliding fit connectors (35) fixed on the right frame (28); on each load-bearing column (2, 2' respectively), at the top, inward, at the same height, the limiting block (38, 37 respectively) is fixed (Fig. 13.2, Fig. 13.4, Fig. 14.1, Fig. 14.2); With the simultaneous actuation of the two motors (5), the two screws (9) begin to rotate, driving the translation nut (21). The translation nut drives the two assembled universal joints (B) through the bearings (17 and 18). The universal joints begin to slide upward in the two support columns (2 and 2') respectively, driving the plate (24) on which the bed frame (C) is assembled through the bolt (15) and the shaft (13). The upward movement will continue until one of the assembled universal joints (B) contacts the connector, not shown, to stop both electric motors (5) at the same time; during descent, the phenomenon is exactly the opposite: the screw (9) rotates in the opposite direction, forcing the assembled universal joint (B) to descend, while driving the bed frame (C). In the "lowered" position of the bed, the legs (30 and 31) are upright due to gravity, and the bed rests on the legs (30 and 31); When the two electric motors (5) are operated simultaneously, when the claws (g and h) of the two levers (33 and 34, respectively) reach the limit blocks (38 and 37, respectively) (Figs. 13.2, 13.4, 14.1, 14.2) and are fixed on the support columns (2 and 2', respectively), the legs (30 and 31) remain in a vertical position until they are close to the end of the vertical stroke; the bed frame (C) continues to move, the limit blocks (38 and 37, respectively) act on the levers (33 and 34, respectively) and force the legs (30 and 31) to rotate and fold under the frame (27) through the thin rod (32); During the descent, the phenomenon is exactly the opposite; once the bed begins to descend, the legs (30, 31) descend to an upright position.

2. The telescopic bed with a variable height system according to claim 1, characterized in that, The bed is equipped with a worktable positioning device (E) (Figures 14.1, 14.2, 15.1, 15.2, 15.3, 15.4, 15.5, 15.6, 15.7). The worktable comprises two identical L-shaped supports (39), which are slidably inserted and fixed by equidistantly positioned bolts (50) (in the examples of Figures 4 and 8, only three bolts are shown, but more bolts could be used to symmetrically position the supports (39) at different heights) between two identical strips (40), the external dimensions of which are calculated such that they... It can be assembled from bottom to top onto a lower shaft (41) with rollers (42), an intermediate shaft (43) with rollers (42), and two coaxial upper half shafts (44 and 45) with rollers (42); the half shafts (44 and 45) are fixed such that when assembled, the plate (24) can slide freely between the strips (40); the support (39) is assembled between the lower shaft (41) and the intermediate shaft (43); the rollers (42) assembled on the shafts and half shafts can slide in rolling grooves (d) (Fig. 9), which are longitudinally symmetrically arranged in each support column (2, 2'); The support member (39) has several grooves (Fig. 16) on the side of the upper frame facing the bed (25), which have the function of adjusting the height of the worktable according to the height of the operator; In the "lowered" position of the bed frame (C) (Fig. 14), the lower shaft (41) with rollers (42) is not in the rolling groove (d), while the intermediate shaft (43) with rollers (42) and the two coaxial upper shafts (44 and 45, respectively) with rollers (42) are in the rolling groove (d); an assembly consisting of two identical blades (46) is mounted on the outside of the conveyor belt (40), the bottom of which is fixed to a spacer (47), and an indexing screw (48) can be inserted into the spacer (47). The top of which is fixed by a pin (49) with rollers (42) can be mounted on a rolling seat ( d In the process of using the indexing screw (48) on the spacer (47), the conveyor belt (40) assembly with rollers (42) can be easily raised or lowered by sliding in the support column (2 or 2'); A horizontal plate (not shown) can be mounted as a worktable on two identical L-shaped supports (39); as the two motors (5) operate simultaneously, the two screws (9) begin to rotate, driving the translation nut (21), which drives the assembled two universal joints (B) via the bearings (17 and 18), the universal joints begin to slide upward in the two support columns (2 and 2'), respectively, driving the plate (24) on which the bed frame (C) is assembled via the bolts (15) and the shaft (13); at a given moment, during the upward movement, the plate (24) engages in the groove of the shaft (49) with rollers (42). n In the rolling groove, the roller is forced to... d The rolling groove (d) is arranged longitudinally symmetrically in the support column (2, 2' respectively); when the indexing screw (48) reaches the first bolt (50) above it, the indexing screw (48) will start to drive the worktable positioning device (E) upward. The upward movement continues until one of the assembled carriages (B) contacts the connector (not shown) to simultaneously stop the two electric motors (5); during descent, the opposite occurs: the screw (9) rotates in the opposite direction, forcing the assembled universal joint (B) to descend, while simultaneously driving the bed frame (C) and the worktable positioning device (E).

Images