CN111282611A

CN111282611A - Experiment operation platform

Info

Publication number: CN111282611A
Application number: CN202010146227.2A
Authority: CN
Inventors: 柳新昌
Original assignee: Bengbu Keruida Machinery Design Co ltd
Current assignee: Bengbu Keruida Machinery Design Co ltd
Priority date: 2018-06-05
Filing date: 2018-06-05
Publication date: 2020-06-16
Also published as: CN108841566A

Abstract

The invention discloses an experimental operating platform which comprises an underframe, an alcohol lamp lifting platform, a protective component, two supporting components and an operating platform surface, wherein the alcohol lamp lifting platform comprises an alcohol lamp, a telescopic cylinder, a cylinder inserted below the telescopic cylinder and a base arranged below the cylinder, a circular groove used for placing the alcohol lamp is formed in the top of the telescopic cylinder, a circular hole for extending the telescopic cylinder is formed in the middle of the operating platform surface, and the protective component comprises an inner pipe, an outer pipe, a telescopic spring and an upper cover. The experiment operating table provided by the invention has the advantages of strong functions, multiple purposes, convenience in transportation and use, and is favorable for smoothly completing experiments due to excellent damping, alcohol lamp protection and height adjustment effects, and the protection assembly can prevent scalding and accidents while improving the working efficiency.

Description

Experiment operation platform

Technical Field

The invention relates to the field of experiments, in particular to an experiment operating table.

Background

The modern industrialized society develops rapidly, and the requirements on the basic education are met, and simultaneously, high requirements are provided for the experimental skills of students. However, the existing operating table for students is simple in structure, only has a single bearing function, cannot meet the use requirement, and is particularly used in chemical experiments with alcohol lamps.

Disclosure of Invention

The invention aims to provide an experiment operating table through analysis, experiments and use aiming at the defects of the prior various technologies.

The specific scheme of the invention is as follows: an experimental operating platform comprises an underframe, an alcohol burner elevating platform, a protective component, two supporting components and an operating table board, wherein the alcohol burner elevating platform comprises an alcohol burner, a telescopic cylinder, a cylinder inserted under the telescopic cylinder and a base arranged under the cylinder, the top of the telescopic cylinder is provided with a circular groove for placing the alcohol burner, the lower end of the telescopic cylinder is sealed with the outer side of the cylinder, the side wall of the telescopic cylinder is provided with a deflation valve, the cylinder is fixedly connected with the underframe, the top of the cylinder is provided with a one-way valve, a piston is arranged in the cylinder, a piston rod is connected under the piston, a first spring is sleeved on the piston rod, the lower end of the piston rod is connected with a rotating rod, the middle of the rotating rod is hinged with the base, the outer end of the rotating rod is connected with a pedal, a second spring is arranged under the pedal, and, the two supporting components are connected between the operating table top and the bottom frame and symmetrically arranged at two sides of the alcohol lamp lifting table, the protection component comprises an inner pipe, an outer pipe, a telescopic spring and an upper cover, the inner pipe is arranged around the round hole, the diameter of the inner pipe is the same as that of the round hole, the side wall of the inner tube is uniformly provided with a plurality of through holes, the outer tube is sleeved outside the inner tube through the base, the top of the outer pipe is the same as the top of the inner pipe in height, the outer pipe is of a foldable spiral fold structure, the telescopic spring is arranged in the outer tube in a penetrating way, the lower end of the telescopic spring is connected with the base, the upper end of the telescopic spring extends out of the top of the outer tube and is connected with the upper cover suspended above the inner tube, the upper cover comprises an annular cover body and a pipe body extending downwards from the inner edge of the annular cover body, two elastic bulges are symmetrically arranged on the inner wall of the pipe body, the inner diameter of the pipe body is larger than the outer diameter of the inner pipe, and the distance between the two elastic bulges is smaller than the outer diameter of the inner pipe.

Preferably, the chassis includes rectangular frame and controls two support bases, rectangular frame includes two longerons and two crossbeams around with about, be provided with middle longeron in the rectangular frame, the cylinder links to each other with two crossbeams around through the tie-beam around respectively, the cylinder links to each other with left longeron, middle longeron through about respectively the tie-beam, be formed with down the slide about respectively on the tie-beam, the operation mesa bottom is formed with the last slide corresponding with the lower slide.

Preferably, the support assembly comprises four first support rods, a second support rod, two third support rods and two fourth support rods, one end of each of the four first support rods is connected together through a first lap joint device, the other end of each of the four first support rods is fixed on two lower corners of the operation table board and two upper corners of the underframe through a second lap joint device respectively, the second support rod is arranged in parallel with the middle longitudinal beam, two ends of each of the second support rods are connected together through a third lap joint device to connect one third support rod with one fourth support rod, the upper ends of the two third support rods are connected together through a fourth lap joint device and are connected with the upper slideway in a sliding manner, the lower ends of the two fourth support rods are connected together through a fifth lap joint device and are connected with the lower slideway in a sliding manner, the middle parts of the two third support rods are hinged together with the middle part of one first support rod respectively, the middle parts of the two fourth supporting rods are respectively hinged with the middle part of one first supporting rod, and locking mechanisms are arranged on the fourth lap joint device and the fifth lap joint device.

Preferably, the supporting base comprises two sleeves, two pull rods, a connecting rod, a sliding plate and an I-shaped supporting plate, the four sleeves are respectively and fixedly connected to four lower corners of the rectangular frame, universal wheels are arranged at the lower ends of the pull rods, the upper ends of the pull rods are movably connected to the lower ends of the sleeves, the connecting rod is connected between the front pull rod and the rear pull rod, a through hole is formed in the middle of the connecting rod, the upper ends of the two sliding plates are respectively and vertically connected to the lower ends of the left longitudinal beam and the right longitudinal beam, the lower ends of the two sliding plates penetrate through the through hole and are respectively connected to the middle of the two I-shaped supporting plates.

Preferably, the base, the I-shaped support plate and the rectangular frame are spaced at the same distance.

Preferably, still include the table top of shaking the dish and the mesa of stewing, the mesa of stewing sets gradually on the rectangular frame on middle longeron right side with the table top of shaking, the mesa of stewing is including fixing four bracing pieces at rectangular frame, connecting the face of stewing down in four bracing piece bottoms and connecting the face of stewing on four bracing piece tops, the table top of shaking is including fixing four two sections telescopic links at rectangular frame and connecting the dish face of shaking at four two sections telescopic link tops, the length that two sections telescopic links extend completely is the twice of bracing piece.

Preferably, operation mesa right side is provided with the pull board, operation mesa top right-hand member be equipped with can with pull board complex roll-over stand, the roll-over stand includes "L" type roll-over stand and "U" type support bar, "L" type roll-over stand includes horizontal plate and vertical board, vertical board rotates with operation mesa right-hand member to be connected, "U" type support bar two free ends are articulated with the horizontal plate outer end, the height and the vertical board height of "U" type support bar are the same, the length and the pull board length of horizontal plate are the same, pull board right-hand member two upper corners are fixed with the locking bolt, two lower corner structures of "U" type support bar and locking bolt complex fixed orifices, two lower corner structures of vertical board have the breach that holds the locking bolt.

By adopting the technical scheme, the invention has the following technical effects: the experiment operating table provided by the invention has the advantages of strong functions, multiple purposes, convenience in transportation and use, and is favorable for smoothly completing experiments due to excellent damping, alcohol lamp protection and height adjustment effects; the protection component can prevent scalding and accidents while providing work efficiency.

Drawings

FIG. 1 is a schematic structural diagram of an experiment operating table provided by the present invention;

FIG. 2 is another schematic view of the laboratory bench provided by the present invention;

FIG. 3 is a schematic structural view of a shield assembly provided by the present invention;

fig. 4 is a schematic structural view of the roll-over stand provided by the invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

It should be noted that the terms of orientation such as front, back, middle, left, right, up and down in the embodiments of the present invention are only relative concepts or reference to the normal use state of the product, and should not be considered as limiting.

Referring to fig. 1-4, an embodiment of the present invention provides an experiment operating table. The experiment operating table comprises an underframe, an alcohol lamp lifting table, a protection assembly, two supporting assemblies, an operating table board, a swinging table board and a standing table board.

The underframe of the invention comprises a rectangular frame 100 and a left supporting base and a right supporting base 110, wherein the rectangular frame 100 comprises a left longitudinal beam, a right longitudinal beam 101, a front cross beam and a rear cross beam 102, a middle longitudinal beam 103 is arranged in the rectangular frame 100, the rectangular frame 100 is equally divided into a left part and a right part by the middle longitudinal beam 103, and the length of an operation table top is half of that of the rectangular frame 100. Each support base 110 comprises a front sleeve 111, a rear sleeve 111, a front pull rod 112, a rear pull rod 112, a connecting rod 113, a sliding plate 114 and an I-shaped support plate 115, the four sleeves 111 are respectively and fixedly connected to four lower corners of the rectangular frame 100, and universal wheels 116 are arranged at the lower ends of the pull rods 112. Wherein, pull rod 112 upper end swing joint is at sleeve pipe 111 lower extreme, and swing joint's mode can be sleeve pipe 111 and pull rod 112 constitution telescopic link structure, for example can be sleeve pipe 111 lateral wall interval from top to bottom be equipped with spacing hole, be provided with on the pull rod 112 can with spacing hole complex elasticity convex button, thereby adjust pull rod 112 length through the cooperation position of adjustment elasticity convex button and spacing hole. The connecting rod 113 is connected between the front pull rod 112 and the rear pull rod 112, a through hole is formed in the middle of the connecting rod 113, the size of the through hole is matched with that of the sliding plates 114, the upper ends of the two sliding plates 114 are respectively and vertically connected to the lower portions of the left longitudinal beam 102 and the right longitudinal beam 102, the lower ends of the two sliding plates 114 penetrate through the through hole and are respectively connected between the two I-shaped supporting plates 105, the I-shaped supporting plates 105 are bilaterally and symmetrically constructed around the connecting rod 113 and the sliding plates 114, and the pull rods 112. When the experiment operating table is moved or transported, the supporting base 110 can be adjusted, the pull rod 112 is stretched downwards, the connecting rod 113 slides downwards relative to the sliding plate 114, the I-shaped supporting plate 115 is separated from the ground, and the four universal wheels 116 are grounded, so that the experiment operating table can be conveniently moved; when the experiment operating table needs to be fixed, the adjusting pull rod 112 is retracted relative to the sleeve 111, the connecting rod 113 slides upwards relative to the sliding plate 114, so that the four universal wheels 116 are separated from the ground, the left and right I-shaped support plates 115 are grounded, and the I-shaped support plates 115 can be used for stably supporting and fixing.

The alcohol lamp lifting platform comprises an alcohol lamp 120, a telescopic cylinder 121, an air cylinder 130 inserted below the telescopic cylinder 121 and a base 122 arranged below the air cylinder 130, wherein the outer wall of the air cylinder 130 is respectively connected with a front cross beam 101 and a rear cross beam 101 through a front connecting beam 123 and a rear connecting beam 123, the air cylinder 130 is respectively connected with a left longitudinal beam and a middle longitudinal beam 103 through a left connecting beam 124 and a right connecting beam 124, a lower slideway 125 is respectively formed on the left connecting beam 124 and the right connecting beam 124, and an upper slideway corresponding to the lower slideway 125 is formed at the bottom of an operation table board. Telescopic tube 121 top is equipped with the circular slot that is used for placing alcohol burner 120, telescopic tube 121 lower extreme and cylinder 130 outside are sealed, bleed valve 126 has been seted up on the telescopic tube 121 lateral wall, cylinder 130 top is provided with check valve 131, install piston 132 in the cylinder 130, be connected with piston rod 133 under the piston 132, the piston rod 133 lower extreme is connected with the dwang, it is articulated with base 122 in the middle of the dwang, the dwang outer end is connected with footboard 127, footboard 127 has the second spring, first spring has been cup jointed on the piston rod 133, the round hole that supplies telescopic tube 121 to stretch out is seted up in the middle of the operation mesa. Wherein, the distance between the base 122 and the I-shaped support plate 105 is the same as the distance between the rectangular frame 100, and the base 122 and the two I-shaped support plates 115 can provide a supporting force for the experiment operating table of the present invention. The alcohol lamp lifting table and the operation table are mutually independent, and the alcohol lamp 120 is placed in the circular groove at the top of the telescopic cylinder 121, so that the influence of the oscillation of the operation table on the flame of the alcohol lamp 121 during the operation process of an operator can be avoided, the experiment is influenced, or the scald is caused, and the fire caused by the overturn of the alcohol lamp by the operator is also avoided; and when the height is adjusted, the user does not need to bend down and operate by hands, only the user needs to step on the pedal 127 by feet, the piston 132 can be pushed to inflate the cylinder 130 through the lever structure formed by the rotating rod, the telescopic cylinder 121 moves upwards through pressurization, the height of the alcohol lamp 121 is increased, and when the height of the alcohol lamp 121 needs to be reduced after an experiment is completed, the user only needs to deflate through the deflation valve 126.

The two support components of the invention are symmetrically arranged at two sides of the alcohol lamp lifting platform, the support components comprise four first support rods 140, a second support rod 141, two third support rods 142 and two fourth support rods 143, one end of each of the four first support rods 140 is connected together through a first lap joint 144, the other end of each of the four first support rods 140 is fixed on two lower corners of the operation platform surface and two upper corners of the underframe through second lap joints respectively, the second support rod 141 is arranged in parallel with the middle longitudinal beam 103, two ends of each of the second support rods 141 are connected together through a third lap joint 145 with a third support rod 142 and a fourth support rod 143, the upper ends of the two third support rods 142 are connected together through a fourth lap joint and are connected with the upper slideway in a sliding manner, the lower ends of the two fourth support rods 143 are connected together through a fifth lap joint 146 and are connected with the lower slideway 125 in a sliding manner, the middle parts of the two third supporting rods 142 are hinged with the middle part of one first supporting rod 140 respectively, the middle parts of the two fourth supporting rods 143 are hinged with the middle part of one first supporting rod 140 respectively, and the fourth lapping device and the fifth lapping device 146 are provided with locking mechanisms for locking the slide way. The support component of the invention has strong and stable load support and stable lifting and stretching, and can well buffer and absorb shock for the operating table surface because the support component has a multi-rod structure, and meanwhile, because the alcohol lamp lifting table and the operating table surface are independently arranged, the support component can not influence the alcohol lamp lifting table while buffering and absorbing shock.

The protection assembly comprises an inner tube 150, an outer tube 151, a telescopic spring 152 and an upper cover 153, wherein the inner tube 150 is arranged around a circular hole, the diameter of the inner tube 150 is the same as that of the circular hole, a plurality of through holes 154 are uniformly formed in the side wall of the inner tube 150, the outer tube 151 is sleeved outside the inner tube 150 through a base 155, the outer tube 151 is connected to the base 155, the top of the outer tube 151 is the same as that of the inner tube 150, the outer tube 151 is of a foldable spiral fold structure, the telescopic spring 152 is penetrated in the outer tube 151, the lower end of the telescopic spring 152 is connected with the base 155, the upper end of the telescopic spring 152 extends out of the top of the outer tube 151 and is connected with the upper cover 153 suspended above the inner tube 150, the upper cover 153 comprises an annular cover body 156 and a tube body 157 extending downwards from the inner edge of the annular cover body 156, the, the elastic protrusions 158 are hollow, the inner diameter of the tube body 157 is larger than the inner diameter of the inner tube 150, and the distance between the two elastic protrusions is smaller than the outer diameter of the inner tube 150. The inner tube 150 and the elastic protrusion 158 are made of fireproof metal material, the base 155 and the upper cover 153 are made of fireproof plastic material, and the outer tube 151 is made of fireproof folding plastic material. When the alcohol lamp is not used, the outer tube 151 is shielded outside the inner tube 150, at the moment, oxygen in the inner tube 150 is less, the fire of the alcohol lamp 120 is small, energy is saved, the service life of the alcohol lamp is prolonged, meanwhile, the inner tube 150 and the outer tube 151 can serve as protection, the influence of movement of operators and natural wind on flame of the alcohol lamp is avoided, the situation that workers turn over the alcohol lamp or are scalded by the alcohol lamp is also avoided, and the safety is improved. The special structural design of the elastic bulge 158 can change the clamping position of the upper cover 153 on the outer wall of the inner tube 150 at will, the use is flexible and convenient, the elastic bulge 158 can be well insulated, and the heat on the inner tube 150 is prevented from being transferred to the upper cover 153, so that the scald is avoided.

The right side of the operation table top is provided with a drawing plate 160, the right side of the operation table top is provided with a round hole groove for accommodating the drawing plate 160, and the drawing plate 160 is connected with the operation table top in a sliding way. The right end of the upper portion of the operation table top is provided with a turning frame 170, the turning frame 170 comprises an L-shaped turning plate 171 and a U-shaped support bar 172, the L-shaped turning plate 171 comprises a horizontal plate 173 and a vertical plate 174, the vertical plate 174 is rotatably connected with the right end of the operation table top, for example, the vertical plate can be connected with the right end of the operation table top through threaded bolts, the two free ends of the U-shaped support bar 172 are hinged to the outer end of the horizontal plate 173, the height of the U-shaped support bar 172 is the same as that of the vertical plate 174, and the length of the horizontal plate 173 is the same as that of the pull plate. Locking bolts 161 are fixed on two upper corners of the right end of the drawing plate 160, fixing holes matched with the locking bolts 161 are formed on two lower corners of the U-shaped supporting bar 172, and notches for accommodating the locking bolts 161 are formed on two lower corners of the vertical plate 174.

The standing deck and the boat deck of the present invention are sequentially disposed on the rectangular frame 100 on the right side of the middle stringer 103. The standing table top comprises four supporting rods 180 fixed on the rectangular frame 100, a lower standing surface 181 connected to the bottoms of the four supporting rods 180 and an upper standing surface 182 connected to the tops of the four supporting rods 180, the boat shaking table top comprises four two telescopic rods 190 fixed on the rectangular frame and a boat shaking surface 181 connected to the tops of the four two telescopic rods 190, and the two telescopic rods 190 extend twice the length of the supporting rods 180. The lower static surface 181, the upper static surface 182, the pull plate 160 and the horizontal plate 173 are gradually increased in height as static surfaces, so that the configuration can be classified according to the configuration time and the type, the storage capacity is large, and the mixing is avoided. Referring to fig. 2, the experiment operating platform of the invention can also adjust the operating platform surface, the upper standing surface 182 and the pan surface 181 to a uniform horizontal height, and the experiment operating platform of the invention can be used as an operating table for other experiments, is convenient to use, is convenient to move and transport, and has multiple purposes.

Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered by the claims of the present invention.

Claims

1. An experiment operation panel which characterized in that: the alcohol lamp lifting platform comprises an alcohol lamp, a telescopic cylinder, a cylinder inserted under the telescopic cylinder and a base arranged under the cylinder, wherein the top of the telescopic cylinder is provided with a circular groove for placing the alcohol lamp, the lower end of the telescopic cylinder is sealed with the outer side of the cylinder, the side wall of the telescopic cylinder is provided with a release valve, the cylinder is fixedly connected with the bottom frame, the top of the cylinder is provided with a one-way valve, a piston is installed in the cylinder, a piston rod is connected under the piston, a first spring is sleeved on the piston rod, the lower end of the piston rod is connected with a rotating rod, the middle of the rotating rod is hinged with the base, the outer end of the rotating rod is connected with a pedal, a second spring is arranged under the pedal, the middle of the operation platform is provided with a circular hole for the telescopic cylinder to extend out, the two supporting components are connected between the operation platform and the bottom frame and are symmetrically arranged at two sides, the protection assembly comprises an inner pipe, an outer pipe, a telescopic spring and an upper cover, wherein the inner pipe is arranged around the round hole, the diameter of the inner pipe is the same as that of the round hole, a plurality of through holes are uniformly formed in the side wall of the inner pipe, the outer pipe is sleeved outside the inner pipe through a base, the height of the top of the outer pipe is the same as that of the top of the inner pipe, the outer pipe is of a foldable spiral fold structure, the telescopic spring is arranged in the outer pipe in a penetrating mode, the lower end of the telescopic spring is connected with the base, the upper end of the telescopic spring extends out of the top of the outer pipe and is connected with the upper cover suspended above the inner pipe, the upper cover comprises an annular cover body and a pipe body extending downwards from the inner edge of the annular cover body, two elastic bulges are;

the bottom frame comprises a rectangular frame and a left supporting base and a right supporting base, the rectangular frame comprises a left longitudinal beam, a right longitudinal beam, a front cross beam and a rear cross beam, a middle longitudinal beam is arranged in the rectangular frame, the air cylinder is connected with the front cross beam and the rear cross beam through a front connecting beam and a rear connecting beam respectively, the air cylinder is connected with the left longitudinal beam and the middle longitudinal beam through a left connecting beam and a right connecting beam respectively, a lower slideway is formed on the left connecting beam and the right connecting beam respectively, and an upper slideway corresponding to the lower slideway is;

the supporting component comprises four first supporting rods, a second supporting rod, two third supporting rods and two fourth supporting rods, one end of each first supporting rod is connected together through a first lap joint device, the other end of each first supporting rod is fixed on two lower corners of the operating table board and two upper corners of the underframe through second lap joint devices respectively, the second supporting rod is arranged in parallel with the middle longitudinal beam, two ends of each second supporting rod are connected with one third supporting rod and one fourth supporting rod through a third lap joint device respectively, the upper ends of the two third supporting rods are connected together through a fourth lap joint device and are connected with the upper slideway in a sliding manner, the lower ends of the two fourth supporting rods are connected together through a fifth lap joint device and are connected with the lower slideway in a sliding manner, and the middle parts of the two third supporting rods are hinged together with the middle parts of the first supporting rods respectively, the middle parts of the two fourth supporting rods are respectively hinged with the middle part of one first supporting rod, and locking mechanisms are arranged on the fourth lapping device and the fifth lapping device;

the supporting base comprises two sleeves, two pull rods, a connecting rod, a sliding plate and an I-shaped supporting plate, the four sleeves are respectively and fixedly connected to four lower corners of the rectangular frame, universal wheels are arranged at the lower ends of the pull rods, the upper ends of the pull rods are movably connected to the lower ends of the sleeves, the connecting rod is connected between the front pull rod and the rear pull rod, a through hole is formed in the middle of the connecting rod, the upper ends of the two sliding plates are respectively and vertically connected to the lower ends of the left longitudinal beam and the right longitudinal beam, the lower ends of the two sliding plates penetrate through the through hole and are respectively connected to the middle of the two I-shaped supporting.

2. The laboratory bench of claim 1 wherein: the distance between the base and the rectangular frame is the same as that between the I-shaped support plate and the rectangular frame.

3. The laboratory bench of claim 1 wherein: still including shaking the dish mesa and the mesa of stewing, the mesa of stewing sets gradually on the rectangular frame on middle longeron right side with shaking the dish mesa, the mesa of stewing is including fixing four bracing pieces at rectangular frame, connecting the face of stewing down in four bracing piece bottoms and connecting the face of stewing on four bracing piece tops, shake the dish mesa including fixing four two sections telescopic links at rectangular frame and connecting the dish face of shaking at four two sections telescopic link tops, the length that two sections telescopic links extend completely is the twice of bracing piece.

4. The laboratory bench of claim 3 wherein: the operation mesa right side is provided with the pull board, operation mesa top right-hand member be equipped with can with pull board complex roll-over stand, the roll-over stand includes "L" type roll-over board and "U" type support bar, "L" type roll-over board includes horizontal plate and vertical board, vertical board rotates with the operation mesa right-hand member to be connected, "U" type support bar two free ends are articulated with the horizontal plate outer end, the height and the vertical board height of "U" type support bar are the same, the length and the pull board length of horizontal plate are the same, be fixed with the locking bolt in the two upper corners of pull board right-hand member, two lower angle structures of "U" type support bar and locking bolt complex fixed orifices, two lower angle structures of vertical board have the breach that holds the locking bolt.