JPH0744176Y2 - Air spring mounting mechanism for tilting the drawing board frame on the drafting table - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an air spring mounting mechanism for tilting a drawing board frame in a drafting table.

[Prior Art] Conventionally, a drawing board frame is tiltably attached to the upper end portion of an elevating support pillar that is vertically inserted into a hollow fixed supporting pillar installed upright on a base member, and is vertically moved with the drawing board frame. There is a drafting table in which both ends of an air spring for tilting a drawing board frame arranged between a pillar and a pillar are pivotally attached to the drawing board frame and a lifting pillar.

[Problems to be solved by the device]

However, in the conventional drafting table, as a mechanism for attaching the air spring to the drawing board frame and the elevating support by the bearing holes of the mounting portions protruding from both ends of the drawing board frame tilting air spring, the air spring is simply used. It suffices that it can be tilted with respect to the drawing board frame and the lifting column when it is tilted.Therefore, the mounting parts at both ends of the air spring are pivotally attached to the drawing plate frame and the lifting pillar by pins. If there is a gap between the mounting portion of the air spring and the bearing hole, the air spring will rattle with respect to the drawing board frame or the elevating column. Further, due to wear of the bearing holes, the gap becomes large due to long-term use, and there is a possibility that instability that lacks reproducibility of the inclination angle may result in a drawing table.

The present invention has been made in view of the above circumstances,
An object of the invention is to provide an air spring mounting mechanism for tilting a drawing board frame in a drafting table, which is free from rattling over a long period of time and can always keep the tilting angle of the drawing board frame in a good use state. It is in.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, an air spring attachment mechanism for tilting a drawing board frame in a drafting table according to the present invention is provided in a hollow fixed column vertically installed on a base member so that it can be lifted and lowered from above. A drawing board frame is tiltably attached to the upper end, and both ends of a drawing board frame tilting air spring arranged between the drawing board frame and the lifting pillar can be freely pivoted to the drawing board frame and lifting pillar. In the drafting table axially attached to the air spring, a bearing hole having tapered holes gradually expanding outward is formed at both ends of a mounting portion protruding from at least one end of the air spring. A mounting frame which is formed in a U shape so as to cover a portion and has a space portion on both sides of the mounting portion, and which has through holes on both side walls thereof is fixed to the drawing board frame or the lifting column, One of the parts has an inner end aligned with one of the tapered holes. A first piece member having a tapered surface, a step portion that is inserted into and fixed to one of the through holes at an outer end portion, and a screw hole is provided at a central portion is provided, and the step portion is provided in the through hole. It is fixed to one of the side walls after being inserted into one side, and the other side of the space has a tapered surface matching the other side of the tapered hole at the inner end and the other side of the through hole at the outer end. A second rod member is provided with a second rod member having a slit that can be expanded inside and a through hole provided in the central portion, and having a head with a tapered surface that widens the slit. It is characterized in that the first piece member and the second piece member are tightened by being screwed into the screw holes of the first piece member through the through holes.

[Operation] The air spring mounting mechanism for tilting the drawing board frame in the drafting table according to the present invention is provided in the central portion of the second piece member arranged in the other space portion of the mounting frame with the above-mentioned configuration. A screw rod having a head portion having a taper surface for expanding the slit of the outer end portion of the second piece member through the through hole provided in the one space portion of the mounting frame; When it is screwed into the screw hole provided in the center of the first piece member fixed to one of the side walls of the mounting frame, the second
The piece member is moved in the direction of the attachment portion of the air spring by the taper surface of the head of the screw rod, and the taper surfaces of the first and second piece members are respectively formed in the tapered holes at both ends of the bearing hole of the attachment portion. Due to the fitting and alignment, the movement of both piece members is stopped, and the attachment portion is pinched by the two piece members whose movement is stopped.

However, since the second piece member is not yet fixed to the mounting frame, when the screw rod is further screwed into the screw hole of the first piece member, the taper surface of the head of the screw rod is provided with the slit of the second piece member. The outer end portion is radially expanded, the outer peripheral surface is pressed against the inner peripheral surface of the other through hole of the mounting frame, and the second piece member is fixed to the mounting frame. The inclination can be freely adjusted for use.

Therefore, no deformation force acts on the both side walls of the mounting frame in the direction of the mounting portion of the air spring.

When the drawing table is used for a long period of time and a gap is created between the mounting frame and the piece member, the screw rod is loosened so that the outer end of the second piece member is the inner circumference of the other through hole of the mounting frame. When the force pressing the surface is released and the screw rod is screwed in again, there is no gap and rattling disappears, and a state with durability equal to or greater than the original action is achieved.

Also at this time, no force that deforms the mounting frame acts.

〔Example〕

An embodiment of an air spring mounting mechanism for tilting a drawing board frame in a drafting table according to the present invention will be described in detail below with reference to the drawings.

In FIG. 1, X is a drafting stand, and the drafting stand X includes hollow fixed columns 20 and 20 'which are erected on base members 10 and 10' having a predetermined space, and hollow fixed columns 20 and 20 '. Elevating columns 30 and 30 ′ that are inserted in the inside so that they can be elevated and lowered, and the elevating columns 3
A connecting member 31 between a horizontal rail 41 of a drawing board frame 40 and a lifting column 30, 30 'which is pivotally attached to the upper ends of the 0, 30' by pins 42, 42 '.
The drawing plate frame tilting air spring 50 disposed between and is a main component.

By the way, as shown in FIG. 2, mounting portions 51 and 52 are provided so as to project at both ends of the air spring 50, and both ends of the bearing hole 53 formed in one mounting portion 51 are As shown in FIG. 3, tapered holes 55 and 56 are formed so as to expand toward the outside.

Reference numeral 60 denotes a U-shaped mounting frame that covers the mounting portion 51 of the air spring 50.
It is fixed to the horizontal rail 41 of. Then, on both side walls 61, 62 of the mounting frame 60, through holes 63, 64 whose central axis is aligned with the central axis of the bearing hole 53 of the mounting portion 51 are formed,
Between the both side walls 61, 62 of the mounting frame 60 and the both side surfaces of the mounting portion 51, as shown in FIGS. 3 and 4, there are provided a first piece member 71 and a second piece member 72, which will be described later. Space portions 65 and 66 provided for the arrangement are formed.

Reference numeral 71 denotes a first piece member disposed in the space 65, and the first piece member 71 has the inner end portion facing the mounting portion 51, as shown in FIGS. The taper surface 73 is aligned with the taper hole 55, the outer end has a stepped portion 75 that is inserted into and fixed to the through hole 63, and the screw hole 77 is provided at the center. In addition, 79 is a welded part.

72 is a second piece member disposed in the space 66, and the second piece member 72 has an inner end portion facing the mounting portion 51, as also shown in the drawings after FIG. Has a tapered surface 74 aligned with the tapered hole 56, has slits 76, 76 ... That can be expanded in the through hole 64 at the outer end, and has an inner diameter at the center of the first piece member 71. A through hole 78 larger than the inner diameter of the screw hole 77 is provided.

Reference numeral 80 is a screw rod having a head 81 having a tapered surface 82 for expanding the slits 76, 76, ...
It is adapted to be screwed into the screw hole 77 of the first piece member 71 through the through hole 78 of 72 and the bearing hole 53 of the mounting portion 51.

Since the air spring mounting mechanism for tilting the drawing board frame in the drafting table according to the present invention is configured as described above,
As shown in FIG. 3, when the screw rod 80 is screwed into the screw hole 77 of the first piece member 71 through the through hole 78 of the second piece member 72 and the bearing hole 53 of the mounting portion 51, As shown in the figure, the second piece member 72 moves toward the mounting portion 51 of the air spring 50 by the tapered surface 82 of the head 81 of the screw rod 80, and the two piece members 71, 72
Is aligned with the tapered holes 55, 56 at both ends of the bearing hole 53 of the mounting portion 51, so that the mounting portion 51 is pinched by the two piece members 71, 72. Furthermore, when the screw rod 80 is screwed in, the head of the screw rod 80 is
By the taper surface 82 of 81, the slits 76, 76, ... Of the second piece member 72
Spread, and the outer end portion of the second piece member 72 spreads in the radial direction,
Its outer peripheral surface is, as shown by the arrow in FIG. 4,
The second piece member is fixed by being pressed against the inner peripheral surface of the through hole 64 of the mounting frame 60. As a result, the drawing board frame 40 can always be used in a desired inclined state.

Also, if the drafting table X is used for a long period of time,
71, 72 and tapered holes 55, 56 at both ends of the bearing hole 53 of the mounting portion 51
When there is a gap between the screw rod 80 and the
The outer end portion of the piece member 72 having the slits 76, 76, ...
By releasing the engagement with the inner peripheral surface of the through hole 64 of 60 and screwing in the screw rod 80 again, there is no gap, therefore there is no rattling and the inclination angle of the drawing board frame is always good It becomes possible to be in a state.

[Effect of device]

As is apparent from the above description, according to the present invention, the inclination angle of the drawing board frame for keeping the drawing board frame in a good use state can always be set to a desired tilting angle, and it does not rattle. It is now possible to provide an air spring attachment mechanism for tilting the drawing board frame on a drafting stand with a long service life, which can achieve the initial action and effect over a long period of time.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG. 1 is a perspective view showing a notched part of a drawing table equipped with an air spring mounting mechanism for tilting a drawing board frame according to the present invention, FIG. The drawing is an exploded perspective view, FIG. 3 is a sectional view for explaining an assembling procedure, and FIG. 4 is a sectional view. X: Drafting stand 10,10 ': Base member 20,20': Hollow fixed column 30,30 ': Lift column 40: Drawing frame 50: Air spring, 51: Mounting part 53: Bearing hole, 55, 56: Tapered hole 60: Mounting frame, 61, 62: Side wall 63, 64: Through hole, 65, 66: Space 71: First piece member 72: Second piece member 73, 74, 82: Tapered surface, 75: Step Part 76: Slit, 77: Screw hole 78: Through hole, 80: Screw rod 81: Head

Claims (1)

[Scope of utility model registration request] 1. A drawing board frame is tiltably attached to the upper end of an elevating support pillar that is vertically inserted into a hollow fixed supporting pillar installed upright on a base member. In the drafting table in which both ends of the air spring for tilting the picture frame arranged between the two are pivotally attached to the picture frame and the elevating support column, the projection is attached to at least one end of the air spring. Forming a bearing hole having a tapered hole that gradually expands outward at both ends, and is formed in a U shape so as to cover the mounting portion and have space portions on both sides of the mounting portion. And a mounting frame having through holes on both side walls thereof is fixed to the drawing board frame or the elevating column, and one of the space portions has a tapered surface at the inner end portion which is aligned with one of the tapered holes. Then
A first piece member having a step portion which is inserted into and fixed to one of the through holes at an outer end portion and a screw hole is provided in a central portion is provided, and the step portion is inserted into one of the through holes. The taper surface is fixed to one of the side walls, the other end of the space portion has a tapered surface matching the other end of the tapered hole at the inner end, and the outer end is expanded in the other end of the through hole. Has a slit,
A second rod member having a through hole at its center is provided, and a screw rod having a head portion having a tapered surface for expanding the slit is attached to the screw of the first rod member through the through hole of the second rod member. An air spring attachment mechanism for tilting a drawing board frame in a drafting table, characterized in that the first piece member and the second piece member are screwed into the holes and tightened.