CN107095443B

CN107095443B - Lifting table

Info

Publication number: CN107095443B
Application number: CN201710437749.6A
Authority: CN
Inventors: 罗成一
Original assignee: SHANGHAI THINKWISE INDUSTRIAL CO LTD
Current assignee: SHANGHAI THINKWISE INDUSTRIAL CO LTD
Priority date: 2017-06-12
Filing date: 2017-06-12
Publication date: 2023-07-21
Anticipated expiration: 2037-06-12
Also published as: CN107095443A

Abstract

The invention relates to a lifting table, which comprises a table top, a pair of grounding support legs, a pair of lifting rods and a cross beam locked between the pair of support legs; the lifting rods are fixed at the bottom of the tabletop and correspondingly inserted into the supporting legs in a sliding manner; the special scheme is as follows: a pair of guide rails are arranged in the supporting legs, the lifting rod is arranged between the pair of guide rails in a sliding manner, and a rack is arranged on the lifting rod; the beam comprises a beam shell, a rotating shaft, a shaft seat, a gear and a torsion spring; the two shaft bases are correspondingly locked on the inner sides of the pair of supporting legs, two ends of the rotating shaft positioned between the two shaft bases correspondingly penetrate into the two supporting legs, and gears are fixed at the exposed end parts of the rotating shaft and meshed with racks on the lifting rod; the torsion spring sleeved outside the rotating shaft provides pretightening force. The invention has the characteristics of reasonable design, simple structure, convenient operation and control and labor saving in lifting adjustment.

Description

Lifting table

Technical field:

the invention relates to a lifting table, in particular to a lifting table with adjustable pretightening force and capable of being easily and manually adjusted to lift.

The background technology is as follows:

the application number 201510791931.2, a manual lifting table, including first supporting component, second supporting component and desktop, first supporting component with second supporting component and desktop fixed connection still include first power cable, and fixed connection in the transmission storehouse of desktop, first supporting component includes first inner tube, first outer tube and first lifter, the free end of first lifter is provided with first lifting pulley, the stiff end of first lifter is provided with first power diverting pulley, first power cable has first input and fixed connection in first output of first inner tube, first output fixed connection in first inner tube, first power cable strides over first lifting pulley with first power diverting pulley; the first power steel cable is connected with a power spring arranged in the transmission bin, so that the pretightening force of the power spring is obtained. According to the technology, the lifting action of the tabletop is adjusted by means of the combination of the steel cable and the pulleys, the winding of the steel cable is complex, the steel cable has certain elastic deformation, consistency of the two supporting components is difficult to obtain, and the assembly precision is difficult to guarantee, so that the tabletop is faulty to use. How to overcome the defects of the prior art, and is the research object of the invention.

The invention comprises the following steps:

the invention aims to design a lifting table which adopts a gear rack to drive a table top to lift in a matched manner and generates pretightening force through a torsion spring on a rotating shaft.

The technical scheme of the invention is realized as follows: a lifting table comprises a table top, a pair of grounding support legs, a pair of lifting rods and a cross beam locked between the pair of support legs; the lifting rods are fixed at the bottom of the tabletop and correspondingly inserted into the supporting legs in a sliding manner; the method is characterized in that: the support legs are provided with a pair of guide rails, the lifting rod is arranged between the guide rails in a sliding manner, and the lifting rod is provided with a rack parallel to the lifting direction; the beam comprises a beam shell, a rotating shaft, a shaft seat, a gear and a torsion spring; the two shaft bases are correspondingly locked on the inner sides of the pair of supporting legs, two ends of the rotating shaft positioned between the two shaft bases correspondingly penetrate into the two supporting legs, and gears are fixed at the exposed end parts of the rotating shaft and meshed with racks on the lifting rod; one end of the torsion spring is locked with an acting sleeve head, the other end of the torsion spring is locked with a force sleeve head, the acting sleeve head is positioned on the rotating shaft through a bearing, and a force adjusting mechanism is arranged between the acting sleeve head and a shaft seat; the force sleeve head is locked on the rotating shaft, and the pretightening force of the torsion spring is led in; a locking mechanism is also arranged between the rotating shaft and the other shaft seat.

The force adjusting mechanism is a worm gear which is locked at the end part of the force sleeve head, the worm is locked on the shaft seat through a fixed seat, and the extending section of the worm extends out of the beam shell and is provided with a tool interface at the end part.

The torsion spring is also provided with a guide cylinder between the force sleeve head and the force sleeve head, one end of the guide cylinder is positioned on the rotating shaft, and the other end of the guide cylinder is embedded on the force sleeve head.

The locking mechanism is a ratchet pawl, and the ratchet is locked on the rotating shaft; the pawl is arranged on the bracket in a sliding penetrating way, a return spring is arranged between the pawl and the bracket, and the return spring always keeps the trend of locking the ratchet wheel by the pawl; the steel wire of a brake cable is fixedly arranged at the rear part of the pawl, the sheath is abutted or locked on the bracket, and the other end of the brake cable extends out of the beam shell and is controlled manually.

The ratchet is of a gear structure, the corresponding pawl is of a rack structure, and the rack is provided with at least two teeth.

The support legs are hollow sections with rectangular sections, caulking grooves are formed on the outer side edges of the pair of support legs, openings for the rotating shafts to pass through are formed on the upper parts of the inner side edges of the pair of support legs, and the caliber of the openings is larger than the diameter of the gears; the guide rail is a sectional material with an omega-shaped section, two sides of the guide rail are inserted into the caulking groove and positioned in the caulking groove by sealing baffle plates at two ends of the supporting leg; the lifting rods are hollow sectional materials with rectangular cross sections, long grooves for the vertical movement of the rotating shaft are processed on the inner side edges of the pair of lifting rods, and the rack bars are embedded on the adjacent side edges of the inner side edges; the lower end part of the section bar of the lifting rod is fixedly provided with a pulley seat, pulleys are respectively and axially positioned at four corners of the pulley seat, and the four pulleys are respectively abutted against a pair of guide rails of the supporting leg in two groups; the lower end part of the rack is abutted against the pulley seat, and the upper end part of the rack is positioned in the pulley seat by a sealing cover at the upper part of the lifting rod.

The invention has the characteristics of reasonable design, simple structure, convenient operation and control and labor saving in lifting adjustment; the torsion spring sleeved outside the rotating shaft provides pretightening force to counter the load weight of the tabletop; the pretightening force of the torsion spring directly drives the lifting rod to act through the gears at two ends of the rotating shaft, so that the balance of the stress of a pair of lifting rods is ensured, the clearance between the gear and the rack is small, the stability is good, the four pulleys at the lower part of the lifting rod are assisted, the lifting is smoother and labor-saving, smaller external force is applied, the height of the tabletop can be adjusted, the optimal operation requirement is met, and the height position is fixed by the locking mechanism.

Description of the drawings:

the invention is further described with reference to the following specific drawings:

figure 1 shows a perspective view of a lifting table

Figure 2 shows an exploded view of the lifting table top

FIG. 3 shows an internal relationship diagram of the supporting legs and the cross beam of the lifting table

FIG. 4 shows an exploded view of the interior of the beam

FIG. 5 shows a top view of the interior of the beam

FIG. 6 shows a cross-sectional view of FIG. 5A-A

FIG. 7 shows an exploded view of the support leg

Wherein the method comprises the steps of

1-desktop 2-support leg 21-caulking groove 22-opening

23-sealing baffle 3-lifting rod 31-supporting beam 32-long groove

33-pulley seat 34-pulley 35-sealing cover 4-cross beam

41-Liang Ke-rotating shaft 43-shaft seat 44-gear

5-guide rail 6-rack 7-torsion spring 71-force sleeve head

72-force sleeve head 73-guide cylinder 74-bearing 8-force adjusting mechanism

81-worm wheel 82-worm 83-fixing seat 84-tool interface

9-locking mechanism 91-ratchet 92-pawl 93-bracket

94-reset spring 95-brake line 951-steel wire 952-sheath

The specific embodiment is as follows:

referring to fig. 1 to 3, the lifting table includes a table top 1, a pair of ground supporting legs 2, a pair of lifting rods 3, and a cross member 4 locked between the pair of supporting legs; a pair of lifting rods 3 are fixed at the bottom of the table top 1, more specifically, a supporting beam 31 is fixed at the top of the lifting rods 3, and the flat table top 1 is directly locked on the supporting beam 31 to obtain uniform support; the two lifting rods 3 are distributed at two ends of the tabletop 1 and correspondingly inserted into the supporting legs 2 in a sliding manner so as to obtain lifting adjustment; in addition, the lower ends of the supporting legs 2 can be selectively locked on a fixed object, and the supporting beams 31 can be grounded as shown in the figure, and the upper supporting beams 31 and the lower supporting beams 31 are parallel, so that the center of gravity is centered.

Referring to fig. 3 and 7, a pair of guide rails 5 are provided in the support legs 2, more specifically, the support legs 2 are hollow profiles having a rectangular cross section, the pair of support legs 2 are formed with caulking grooves 21 on outer sides which are far apart, and openings 22 through which the rotating shaft passes are machined on upper sides of the inner sides which are close to each other, and the diameters of the openings 22 are larger than those of the gears; the guide rail 5 is a sectional material with an omega-shaped section, two sides of the sectional material are inserted into the caulking grooves 21 of the supporting legs and are positioned in the caulking grooves by the sealing baffle plates 23 locked at two ends of the supporting legs 2, and the guide rail 5 is easy and convenient to install.

As shown in fig. 3 and 7, the lifting rod 3 is a hollow section with a rectangular cross section, long grooves 32 for the vertical movement of the rotating shaft are processed on the inner side edges of a pair of lifting rods 3, and the rack 6 is embedded on the adjacent side edges of the inner side edges, and the lifting direction of the rack 6 is parallel to the lifting direction of the lifting rods; the lower end part of the section bar of the lifting rod 3 is fixedly provided with a pulley seat 33, pulleys 34 are respectively and axially positioned at four corners of the pulley seat 33, and the four pulleys 34 are respectively divided into two groups to be abutted against a pair of guide rails 5 of the supporting leg; the lower end of the rack 6 is abutted against the pulley seat 33, and the upper end is positioned in the pulley seat by the cover 35 at the upper part of the lifting rod, so that the installation is convenient.

The supporting legs 2 and the lifting rods 3 are processed by adopting sectional materials with rectangular sections, so that the lifting device is convenient and standard; the lifting rod 3 is slidably arranged between the pair of guide rails 5 through four pulleys 34, can flexibly lift and is supported stably.

Referring to fig. 1 to 6, the cross beam 4 includes Liang Ke 41, a rotating shaft 42, a shaft seat 43, a gear 44 and a torsion spring 7; the cross members 4, in addition to being used to secure a pair of support legs 2 and maintain a rigid strength, also take the effect of lifting the total weight of the load on the table top, i.e. the pre-load. The two shaft seats 43 are correspondingly locked on the inner sides of the pair of supporting legs 2 and correspond to the openings 22, the rotating shaft 42 is positioned between the two shaft seats 43, the two ends correspondingly penetrate into the two supporting legs 2, and the exposed end parts of the rotating shaft 42 are fixedly provided with gears 44, and the gears 44 are meshed with the racks 6 on the lifting rod 3; the pre-tightening force generated by the torsion spring 7 is transmitted to the rack 6 through the gear 44, and the height position of the lifting rod 3 is maintained. In this structure, liang Ke 41 only plays a role in protection, and is directly locked between the two shaft bases 43.

One end of the torsion spring 7 is locked with the force sleeve head 71, the other end is locked with the force sleeve head 72, a guide cylinder 73 is arranged between the force sleeve head 71 and the force sleeve head 72, one end of the guide cylinder 73 is positioned on the rotating shaft 42, and the other end is embedded on the force sleeve head 72, so that the torsion spring 7 is supported and guided. The force sleeve head 71 is positioned on the rotating shaft 42 through a bearing 74, and a force adjusting mechanism 8 is arranged between the force sleeve head and a shaft seat 43; the force sleeve head 72 is locked on the rotating shaft 42, and the pretightening force of the torsion spring 7 is led in; a locking mechanism 9 is also provided between the shaft 42 and the other shaft mount 43 to maintain the table top 1 at a desired height.

As shown in fig. 4 to 6, the force adjusting mechanism 8 is a worm gear, a worm gear 81 is locked at the end of the force sleeve head 71, a worm 82 is locked on the shaft seat 43 through a fixing seat 83, an extension section of the worm 82 extends out of the beam shell 41, and a tool interface 84 is arranged at the end, so that the worm 82 is driven to rotate through a tool such as a hexagonal screwdriver or a special wrench, and the force sleeve head 71 is driven to rotate, so that the torsion spring 7 increases torsion or decreases torsion, namely, the pretightening force is adjusted.

The locking mechanism 9 is a ratchet pawl, and the ratchet 91 is locked on the rotating shaft 42; the pawl 92 is slidably arranged on the bracket 93, a return spring 94 is arranged between the pawl 92 and the bracket 93, and the return spring 94 always keeps the trend of the pawl 92 locking the ratchet 91; a wire 951 of a brake cable 95 is secured to the rear of the pawl 92 and a sheath 952 is provided against or locked to the bracket 93, the other end of the brake cable 95 extending beyond the beam housing 41 for manual manipulation. In the illustrated example, the ratchet 91 has a gear structure, and the corresponding pawl 92 has a rack structure, which has two to three teeth, so as to ensure the reliability of engagement and locking.

The locking mechanism 9 can adopt a shaft-holding scheme except the above, and the locking mechanism is a conventional mechanism.

Claims

1. A lifting table comprises a table top, a pair of grounding support legs, a pair of lifting rods and a cross beam locked between the pair of support legs; the lifting rods are fixed at the bottom of the tabletop and correspondingly inserted into the supporting legs in a sliding manner; the method is characterized in that: the support legs are provided with a pair of guide rails, the lifting rod is arranged between the guide rails in a sliding manner, and the lifting rod is provided with a rack parallel to the lifting direction; the beam comprises a beam shell, a rotating shaft, a shaft seat, a gear and a torsion spring; the two shaft bases are correspondingly locked on the inner sides of the pair of supporting legs, two ends of the rotating shaft positioned between the two shaft bases correspondingly penetrate into the two supporting legs, and gears are fixed at the exposed end parts of the rotating shaft and meshed with racks on the lifting rod; one end of the torsion spring is locked with an acting sleeve head, the other end of the torsion spring is locked with a force sleeve head, the acting sleeve head is positioned on the rotating shaft through a bearing, and a force adjusting mechanism is arranged between the acting sleeve head and a shaft seat; the force sleeve head is locked on the rotating shaft, and the pretightening force of the torsion spring is led in; a locking mechanism is also arranged between the rotating shaft and the other shaft seat.

2. A lifting table as claimed in claim 1, wherein: the force adjusting mechanism is a worm gear which is locked at the end part of the force sleeve head, the worm is locked on the shaft seat through a fixed seat, and the extending section of the worm extends out of the beam shell and is provided with a tool interface at the end part.

3. A lifting table as claimed in claim 2, wherein: the torsion spring is also provided with a guide cylinder between the force sleeve head and the force sleeve head, one end of the guide cylinder is positioned on the rotating shaft, and the other end of the guide cylinder is embedded on the force sleeve head.

4. A lifting table as claimed in claim 1, wherein: the locking mechanism is a ratchet pawl, and the ratchet is locked on the rotating shaft; the pawl is arranged on the bracket in a sliding penetrating way, a return spring is arranged between the pawl and the bracket, and the return spring always keeps the trend of locking the ratchet wheel by the pawl; the steel wire of a brake cable is fixedly arranged at the rear part of the pawl, the sheath is abutted or locked on the bracket, and the other end of the brake cable extends out of the beam shell and is controlled manually.

5. A lifting table as defined in claim 4, wherein: the ratchet is of a gear structure, the corresponding pawl is of a rack structure, and the rack is provided with at least two teeth.

6. A lifting table as claimed in claim 1, wherein: the support legs are hollow sections with rectangular cross sections, the outer side edges of the pair of support legs are provided with caulking grooves, the upper parts of the inner side edges are provided with openings for the rotating shafts to pass through, and the caliber of the openings is larger than that of the gears; the guide rail is a sectional material with an omega-shaped section, two sides of the guide rail are inserted into the caulking groove and positioned in the caulking groove by sealing baffle plates at two ends of the supporting leg; the lifting rods are hollow sectional materials with rectangular cross sections, long grooves for the vertical movement of the rotating shaft are processed on the inner side edges of the pair of lifting rods, and the rack bars are embedded on the adjacent side edges of the inner side edges; the lower end part of the section bar of the lifting rod is fixedly provided with a pulley seat, pulleys are respectively and axially positioned at four corners of the pulley seat, and the four pulleys are respectively abutted against a pair of guide rails of the supporting leg in two groups; the lower end part of the rack is abutted against the pulley seat, and the upper end part of the rack is positioned in the pulley seat by a sealing cover at the upper part of the lifting rod.