JPH03102Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a connection device between a vertical frame and a horizontal frame with casters, which constitute an inverted T-shaped support stand for a mobile blackboard. , relates to a connecting device for connecting a vertical frame to which a blackboard body is attached and a horizontal frame to which casters without stoppers are attached to the front end and casters with stoppers are attached to the rear end.

(Prior art and its problems) In the case of a mobile blackboard, in order for a person to stand in front of the blackboard and draw letters on the board surface, it is easy for footwear to be caught on the horizontal frame of the support stand during use. It is customary that casters with stoppers that tend to get in the way are placed on the rear end side of the horizontal frame, and only casters without such stoppers are placed on the front end side.

By the way, when assembling and connecting the vertical frame and horizontal frame of this support base, it is often the case that the front end and the rear end of the horizontal frame are mistakenly attached to the vertical frame in the opposite position. However, once they are connected incorrectly, they must be disassembled and reassembled in the correct condition, which is extremely inconvenient and requires extra labor.

(Technical means for solving the problem) The present invention is a connection that eliminates the above-mentioned mistakes when assembling the vertical frame and horizontal frame that make up the support base, and allows them to be assembled accurately in the correct position. The technical means for achieving this purpose is to provide a pair of bolt insertion sockets 8 and 9 at successive positions in the center of the horizontal frame 4. , so as to pass through the horizontal frame in the vertical direction, and the upper ends 8c, 9 of these sockets 8, 9
c are fixed so as to protrude with different protrusion heights, while the mounting plate 1 is fixed in the lower end of the vertical frame 3.
1 is fixed along the cross section of the vertical frame, and this mounting plate 11 is provided with screw holes 12 and 13 at positions corresponding to the pair of sockets 8 and 9, respectively, and has at least the high protruding height. The threaded hole 12 corresponding to one socket 8 is concentrically provided with a fitting recess 14 on its lower side into which the upwardly protruding end of the socket is fitted, and the vertical frame 3 is fitted in the center of the upper surface of the horizontal frame 4. At the same time, the bolts 10 and 10 inserted through the sockets 8 and 9 are inserted into the mounting plate 11 by fitting the upper protruding ends of the corresponding sockets 8 into the fitting recesses 14 of the mounting plate 11. screw hole 1
2 and 13 are screwed and tightened.

(Example) Examples of the present invention will be described below based on the drawings.

Figure 1 shows a mobile blackboard, and in this figure, 1 is a blackboard main body that can be used on both sides, and is supported by a pair of support stands 2, 2 on both sides so that it can rotate and be fixed in a fixed position. ing. Each support stand 2
It is formed into a substantially inverted T-shape by a rectangular cylindrical vertical frame 3 made of extruded aluminum, for example, and a rectangular cylindrical horizontal frame 4 also made of extruded aluminum, which is connected to the lower end of the vertical frame 3. A caster 5 is attached to the front end of the horizontal frame 4, and a caster 6 with a stopper 7 is attached to the rear end.

Next, the connection device between the vertical frame 3 and the horizontal frame 4 that constitute each support stand 2 will be explained with reference to FIG.
A pair of hollow cylindrical bolt insertion sockets 8 and 9 are disposed in the center of the horizontal frame 4 at successive positions so as to pass vertically through the horizontal frame. These sockets 8, 9 are made of copper, aluminum, etc., and have insertion holes 8a, 9a into which the main body of the bolt 10 can be inserted, and engagement holes with a large diameter into which the head of the bolt 10 can be engaged. The sockets 8 and 9 have small diameter cylindrical portions 8c and 9c at the upper ends thereof, respectively, protruding from the upper surface of the horizontal frame 4, and are integrally formed with the horizontal frame 4 by brazing or the like. The upper end cylindrical portion 8c of the front side socket 8 which is fixed and protrudes from the upper surface of the horizontal frame 4 has a protruding height higher than the upper end cylindrical portion 9c of the rear side socket 9. On the other hand, within the lower end of the vertical frame 3, a mounting plate 11 made of a steel plate having an appropriate thickness is attached to the vertical frame 3.
Vertical frame 3 at a predetermined distance apart from the bottom edge of
It is fixed by welding etc. along the cross section.
This mounting plate 11 has bolts 1 at positions corresponding to bolt insertion sockets 8 and 9 fixed to the horizontal frame 4.
Screw holes 12 and 13 into which 0 is screwed are provided,
A fitting recess 14 into which the protruding end of the small diameter cylindrical portion 8c of the socket 8 can be fitted is provided on the lower side of the screw hole 12 corresponding to the socket 8 in which the small diameter cylindrical portion 8c has a high protrusion height. It is provided concentrically with the screw hole 12. In this embodiment, when forming the fitting recess 14 and the screw hole 12, a hole with a predetermined inner diameter is formed in the mounting plate 11, and a nut 15 is fixed to the upper end of the hole. 15 is a screw hole 12, and the lower part of the hole to which the nut 15 is fixed is a fitting recess 14.

Therefore, when connecting the vertical frame 3 and the horizontal frame 4 with casters 5 and 6, it is necessary to use a horizontal frame that has casters 5 at the front end and casters 6 with stoppers 7 at the rear end. 4, and bring the lower end of the vertical frame 3 to the center of the horizontal frame 4 so that the cylindrical parts 8c and 9c of the sockets 8 and 9 protruding from the upper surface of the horizontal frame 4 face the lower surface of the mounting plate 11 of the vertical frame 3. , the cylindrical part 8c with a high protruding height is fitted into the fitting recess 14 of the mounting plate 11, and the other cylindrical part 9c is fitted into the adjacent screw hole 13.
With the lower end of the vertical frame 3 facing directly under the horizontal frame 4
After finishing the positioning by bringing them into contact with the upper surface, the vertical frame 3 and the horizontal frame 4 are connected and fixed at right angles by pushing the bolts 10 into the sockets 8 and 9, screwing them into the screw holes 12 and 13, and tightening them. be able to. In this case, if the mounting position of the vertical frame 3 with respect to the horizontal frame 4 is incorrectly attached in the positioning stage and the front and back are reversed, the cylindrical portion 8c of the socket 8 with the higher protruding height protruding from the upper surface of the horizontal frame 4 The vertical frame 3 cannot enter the fitting recess 14 and hits the bottom surface of the mounting plate 11.
A gap is created between the lower end surface of the frame 4 and the upper surface of the horizontal frame 4, thereby making it possible to immediately know if the mounting position is incorrect.

FIG. 3 shows another embodiment of the present invention, in which a mounting plate 21 that is considerably thicker than the mounting plate 11 in the previous embodiment is used, and the mounting plate 21 has screw holes 22.
This embodiment is slightly different from the previous embodiment in that the engagement recess 24 and the engagement recess 24 are arranged in series. That is, the mounting plate 21 fixed in the lower end of the vertical frame 3 is provided with screw holes 22 and 23 at positions corresponding to the cylindrical parts 8c and 9c of the sockets 8 and 9 protruding from the upper surface of the horizontal frame 4, respectively. A fitting recess 24 is provided at the lower end of one of the screw holes 22, into which the tip of the cylindrical portion 8c with a higher protrusion height can be fitted. At first, the upwardly protruding ends of both sockets 8 are fitted into fitting recesses 24 on the lower surface side of the mounting plate 21. In this case, the upper protruding end of the socket 9 with the lower protruding height is
In addition to making it a little higher than the one shown in the figure, a fitting recess into which the protruding end can be fitted is provided at the lower end of the screw hole 23, so that the upper protruding ends of both sockets fit into the lower surface of the mounting plate. They may be fitted into the respective recesses, thereby preventing the vertical frame 3 from undesirably rotating when tightening the bolts, making the connection work easier.

(Effects of the invention) According to the invention, a pair of bolt insertion sockets are disposed at successive positions in the center of the horizontal frame, penetrating the horizontal frame in the vertical direction, and the upper ends of these sockets The two sockets are made to protrude from the upper surface of the horizontal frame at different protrusion heights, while a mounting plate is attached to the lower end of the vertical frame, screw holes are provided at positions corresponding to the pair of sockets, and at least the protrusion height is A fitting recess is provided at the bottom of the screw hole corresponding to the higher socket, so that when connecting the vertical frame and horizontal frame, positioning can only be performed when both are in the correct positional relationship. This has the effect that if you make a mistake in the positional relationship, you can confirm the mistake in advance during the positioning process. Furthermore, in the present invention, since the protrusion heights of the upper end protrusions of the pair of sockets are made to be different, it is possible to use materials of the same diameter when manufacturing these sockets. The manufacturing cost can be much lower compared to the case where the

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of a movable blackboard according to the present invention, FIG. 2 is a cross-sectional view of the connecting device of the blackboard in FIG. 1, and FIG. 3 is a cross-sectional view showing a connecting position according to another embodiment. be. 1...Blackboard body, 2...Support stand, 3...Vertical frame,
4... Horizontal frame, 5, 6... Caster, 7... Stopper, 8, 9... Socket, 10... Bolt, 1
1...Mounting plate, 12, 13...Screw hole, 14...
Engagement recess.

Claims (1)

[Scope of utility model registration request] A connecting device for connecting a vertical frame to which a blackboard body is attached and a horizontal frame to which casters are attached to the front end and casters with stoppers to the rear end, and in the center of the horizontal frame there are two , a pair of bolt insertion sockets are fixed so as to vertically penetrate the horizontal frame and the upper ends of these sockets protrude at different heights, while the lower ends of the vertical frame A mounting plate is fixed inside the section along the cross section of the vertical frame, and this mounting plate has the above-mentioned
Screw holes are provided at positions corresponding to the pair of sockets, and at least the screw hole corresponding to the socket with the higher protrusion height has a fitting recess on the lower side into which the upwardly protruding end of the socket is fitted. are provided concentrically, and the lower end surface of the vertical frame is brought into contact with the center of the upper surface of the horizontal frame, and the upwardly protruding ends of the corresponding sockets are engaged with the engagement recesses of the mounting plate, and these sockets are A connecting device for connecting a vertical frame and a horizontal frame with casters in a support stand for a mobile blackboard, characterized in that an inserted bolt is screwed into a screw hole of a mounting plate and tightened.