JPH0530956Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The invention is based on the base line at the head of a universal parallel ruler,
Regarding braking devices such as angles.

[Conventional technology]

As shown in Japanese Utility Model Publication No. 49-41393, the head of the universal parallel ruler is held at a fixed angle on the drawing board and is moved parallel to the head supporting board, and the protractor is rotated at the desired rotation angle. It is provided with a baseline brake device for releasably fixing, and an angle brake device for releasably fixing the main shaft side to the support substrate or the protractor at any rotation angle.

The structure of these brake devices is that a shaft body is supported in a fixed position on a fixed member, and a wide-bottomed groove is formed along the circumferential direction in the fixed member, and a locking member formed on the shaft body is formed in this groove. The fixing member is fixed to the fixed member by arranging the member, moving the shaft body in the pulling direction by operating a lever, and pressing the locking member against the wall surface forming the narrow part of the wide-bottomed groove. are doing.

[Problem that the invention attempts to solve]

The fixing member, such as the protractor, is made of aluminum in order to reduce the weight of the head.
Therefore, if a large amount of pressure is applied from the locking member to the narrow wall surface of the wide-bottomed groove of the protractor, the portion to which this pressure is applied may be deformed, or the narrow wall surface may be worn out. There was a flaw in that it was not possible to obtain large braking force. The present invention aims to eliminate the above defects.

[Means to solve problems]

In order to achieve the above object, the present invention provides a device for releasably fixing a rotatable fixing member to a member to be fixed at an arbitrary angle, the fixing member has a circular line centered on the rotation center of the fixing member. A groove is formed along the fixing member, and a plurality of brake plates made of flexible ring-shaped thin plates are fixed at multiple locations at approximately equal pitches on the inside of the fixing member, and a groove is formed from flexible ring-shaped thin plates on the outside of the fixing member. A plurality of brake plates consisting of the above-mentioned inner brake plates are fixed so as to be shifted by approximately half a pitch with respect to the fixing location of the inner brake plates, and a narrow space is provided in the opposing portion of the plurality of inner brake plates and the plurality of outer brake plates. an intermediate brake plate is formed between the inner and outer brake plates, spanning the inner and outer brake plates, and a fixing shaft is formed in the shaft hole of the protrusion provided on the fixed member side. are fitted so as to be slidable in the axial direction, the fixed shaft is disposed within the narrow space, the fixed shaft is fitted into the hole of the intermediate brake plate, a locking member is provided on the fixed shaft, and the locking member is fitted. a stop member is disposed within the groove so as to be relatively movable along the groove, the protrusion is disposed in contact with the upper surface of opposing portions of the inner and outer brake plates, and a lifting mechanism is linked to the fixed shaft;
The inner and outer brake plates and the intermediate brake plate can be pinched between the protrusion and the locking member by the lifting mechanism.

[Effect]

In the above configuration, when the fixed shaft is pulled up by the pulling mechanism, the brake plate is pressed between the upper surface of the locking member and the protrusion, and the fixed member is firmly fixed to the fixed member via the brake plate. be done. Even if the lifting force of the fixed shaft is increased, the brake plate will not be permanently deformed because it is made of an elastic thin plate material.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below with reference to a baseline brake device shown in the accompanying drawings.

Reference numeral 2 denotes a main shaft of a known rail type universal parallel ruler, which is rotatably supported by a tubular double shaft 4. Reference numeral 6 denotes a support base made of aluminum, which is supported by a known parallel movement support mechanism so as to be able to move in parallel on the drawing board while maintaining a predetermined angle. This parallel movement support mechanism and support base are described in detail in FIGS. 3 and 1 of Japanese Patent Application Laid-Open No. 104896/1983, or in other Japanese Patent Laid-Open No. 104896.
The multiple shaft 4 is fixed to the support base 6 (fixed member). A scale mounting plate (not shown) to which a scale is attached is fixed to the lower end of the main shaft 2, and by rotating the main shaft 2, the scale can be rotated on the drawing board. 8 is a fixed plate made of aluminum, and the support base 6
It is fixed with screws. A tubular protrusion 8a is formed on the fixed platen 8, and a fixed shaft 10 that loosely fits into a hole provided in the support base 6 is slidably inserted into the shaft hole of the protrusion 8a. . 1
Reference numeral 2 denotes an aluminum protractor (fixing member) which is rotatably fitted onto the multi-shaft 4, and a groove 13 is bored along a circular line centered on the rotation center of the aluminum protractor. A locking member 10a formed at the tip of the fixed shaft 10 is disposed in the groove 13 so as to be movable along the longitudinal direction of the groove 13. The width of the groove 13 is formed to be slightly wider than the width of the locking member 10a. Ring-shaped inner brake plates 14 and 16 are placed on the protractor 10, and a ring-shaped spacer 18 is placed between the brake plates 14 and 16. Reference numeral 20 denotes a ring-shaped inner press plate, which is placed on the brake plate 16.
Inside the protractor 10, six screw holes 2 are provided at regular intervals along a circular line centered on the center of rotation.
2 are bored, and the presser plate 20, the brake plates 14, 16 and the spacer 1 are provided in correspondence with the screw holes 22.
A through hole is formed at 8. Insert the countersunk screw 2 into the through hole.
4 is inserted, and the countersunk screw 24 is screwed into the screw hole 22 to firmly fix the brake plates 14, 16, spacer 18, and presser plate 20 to the protractor 10. The tapered portion of the head of the countersunk screw 24 tightly fits into the tapered portion formed in the through hole of the holding plate 20. Ring-shaped outer brake plates 26 and 28 are arranged on the protractor 12, and a ring-shaped spacer 30 is arranged between the brake plates 26 and 28. 32 is a ring-shaped outer press plate, which is placed on the brake plate 28. On the outside of the protractor 12, six screw holes 34 are provided at regular intervals along a circular line centered on the center of rotation.
is drilled therein, and through holes are formed in the presser plate 32, brake plates 28, 26, and spacer 30 in correspondence with the screw holes 34. A countersunk screw 36 is inserted into the through hole, and the countersunk screw 36 is screwed into the screw hole 34 to firmly fix the brake plates 26, 28, spacer 30, and presser plate 32 to the protractor 12. . The tapered portion of the head of the countersunk screw 36 is tightly fitted into the tapered portion formed in the through hole of the holding plate 32. Screws 36 of the outer brake plates 26, 28
The fixing points are as shown in Figures 6 and 7.
The inner brake plates 14 and 16 are offset by half a pitch relative to the fixing locations with the screws 24. If the 8th
As shown in FIG. a, when the fixing points of the inner and outer brake plates are aligned radially, the braking part 40' may be located between the fixing points of the inner and outer brake plates. In this case, the brake applying portion 40' separates from the fixing points of the inner and outer brake plates, so when a large external force is applied to the protractor, the inner and outer brake plates are affected by the external force as shown in Fig. 8b. , c, and the protractor board 12 ends up rotating. However, as shown in Fig. 7, if the fixing points of the inner and outer brake plates are shifted by half a pitch, the brake application part 40'
is always close to the fixed location of the inner brake or outer brake, so the protractor 12
The brake applying portion 40'
The fixed portions near the brake plate provide a large resistance force, preventing deformation of the inner and outer brake plates, and preventing the minute dial 12 from rotating due to external force when the brake is applied. the inner brake plates 14, 16 and the outer brake 26,
28 are opposed to each other with an interval slightly wider than the diameter of the fixed shaft 10, the interval is formed along a circular line centered on the rotation center of the protractor 12, and the fixed A shaft 10 is inserted and arranged. The opposing portions of the inner and outer brake plates form a narrow space with respect to the opening of the groove 13, and the narrow space 3
8 and the groove 13 form a wide-bottomed groove. The brake plates 14, 16, 26, 28, the holding plate 2
0 and 32 and the spacers 18 and 30 are made of flexible, high-strength, hard thin plates, such as stainless steel thin plates. The tip end surface of the protrusion 8a is in contact with the upper surface of the brake plates 16, 28. A hole 42 of an intermediate brake plate 40 made of a thin plate made of stainless steel is slidably inserted into the outer peripheral surface of the fixed shaft 10, and both sides of the brake plate 40 are located between the brake plates 14 and 16 and between the brake plates 26 and 28. They are arranged so that they can slide freely between them. The brake plate 4
Holes 44 and 46 are transparently provided before and after the locking member 10, and pins 48 and 50 protruding from the locking member 10 are slidably fitted into the holes, and the brake plate 40 is inserted into the locking member 1.
It is configured so as not to shift in the rotational direction with respect to 0a. Reference numeral 52 denotes a baseline lever, to which a flanged nut 54 is fixed. The nut 54 is screwed into a threaded portion of the fixed shaft 10. Said nut 5
The collar portion 54a of No. 4 faces the upper surface of the support base 6 with a washer 56 interposed therebetween. The above-mentioned presser plate 20,
A plurality of protruding shafts 58 and 60 are protruded from the brake plate 1 at predetermined intervals along the concentric lines of the brake plate 32.
4, 16, 26, 28 and the corresponding holes of the spacers 18, 30. The locking member 10a, the mechanism for pulling it up, the projection 8a, the brake plates 14, 16 and the brake plate 40, and the brake plates 26, 28 and the brake plate 40 constitute a multi-plate brake mechanism. Note that in FIG. 6, a to f and A to F indicate pressure points of the protrusion shafts 58 and 60.

Next, the operation of this embodiment will be explained.

With the lever 52 swung in the direction of releasing the pulling force of the nut 54 against the fixed shaft 10, and with the main shaft 2 side connected by a known index mechanism (not shown), press the grip handle on the upper part of the main shaft 2. When the main shaft 2 is rotated by manual operation, the protractor (fixed member) 12 rotates around the outer peripheral surface of the multiple shaft 4. Once the protractor 12 is set at the desired angle, when the baseline lever 52 is swung in the tightening direction, the fixed shaft 10 is pulled up by the rotation of the nut 54, and the locking member 10a is attached to the brake plate 14,
26 upward and brake plates 14, 40,
16, 26, 40, and 28 are pinched between the lower surface of the projection 8a and the upper surface of the locking member 10a. Due to this clamping force, the brake plates 14, 16 and 26, 28
is crimped and fixed to the fixed platen 8, and the protractor plate 12 is fixed to the fixed platen 8. When the lever 52 is swung in the opposite direction, the above-mentioned fixation is released. The nut 54 and the baseline lever 52 constitute a pulling mechanism that pulls up the fixed shaft 10.

In addition, when the brake plate 40 is rotatable with respect to the fixed shaft 10, when a strong external stress is applied to the protractor plate 12 and a rotational force is applied to the protractor plate 12, the protractor plate 40 is rotated inside the brake plate 40. 12 acts strongly, and this causes the brake plate 40 to move toward the fixed shaft 1.
This results in rotation with respect to 0, and the protractor board 12 shifts in the direction of rotation. However, in this embodiment, the brake plate 40 is connected to the locking member 10a by the pins 48, 50 so as not to rotate, so the above-mentioned disadvantage does not occur.

〔effect〕

As mentioned above, the present invention has a multi-plate brake structure by stacking a plurality of thin elastic brake plates, so that the fixed member can be firmly fixed to the fixed member, and the inner and outer brake plates can be fixed firmly. Since the fixing points are shifted approximately half a pitch from each other, the inner and outer brake plates are less likely to deform due to large external forces applied to the brake application part, and this has the effect of preventing the fixing members from easily rotating due to external forces. Exists.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main parts, Fig. 2 is an exploded perspective view of parts, Fig. 3 is a sectional view, Fig. 4 is a sectional view, Fig. 5 is a plan view, Fig. 6 is a plan view, and Fig. 7 is a plan view. The figure is an explanatory plan view, and FIG. 8 is an explanatory view. 2...Main shaft, 4...Double axis, 6...Support base,
8... Fixed plate, 8a... Projection, 10... Fixed shaft, 12... Protractor board, 12... Groove, 14, 16...
...Inner brake plate, 18...Spacer, 20...
Holding plate, 22...Screw hole, 24...Countersunk screw, 2
6, 28... Outer brake plate, 30... Spacer, 32... Holding plate, 34... Screw hole, 36...
Flat head screw, 38... Narrow space, 40... Intermediate brake plate, 42... Hole, 44, 46... Hole, 48,
50...Pin, 52...Base line lever, 54...Nut, 54a...Brim portion, 56...Washer, 58,
60...protrusion.

Claims (1)

[Scope of utility model registration request] In a device for releasably fixing a rotatable fixing member to a fixed member at an arbitrary angle, a groove is formed in the fixing member along a circular line centered on the rotation center of the fixing member, and the fixing member A plurality of brake plates made of flexible ring-shaped thin plates are fixed to the inside of the fixing member at approximately equal pitches, and a plurality of brake plates made of flexible ring-shaped thin plates are fixed to the outside of the fixing member. The plate is fixed so as to be shifted approximately half a pitch with respect to the fixing point, and a narrow space is formed on the groove and along the groove in the opposing portion of the plurality of inner brake plates and the plurality of outer brake plates. , an intermediate brake plate is disposed between the inner and outer brake plates spanning the inner and outer brake plates, and a fixed shaft is slidably fitted in the axial direction into a shaft hole of a protrusion provided on the fixed member side, The fixed shaft is disposed within the narrow space, the fixed shaft is inserted into the hole of the intermediate brake plate, a locking member is provided on the fixed shaft, and the locking member is inserted into the groove along this. The protrusions are disposed so as to be relatively movable, and the projections are arranged in contact with the upper surfaces of opposing parts of the inner and outer brake plates, and a lifting mechanism is linked to the fixed shaft, and the lifting mechanism allows the inner and outer brake plates and A brake device for a head of a universal parallel ruler, characterized in that an intermediate brake plate can be pressed between the protrusion and the locking member.