JPH055457Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a spring adjustment device for adjusting the tension of a spring.

(Background Art) Conventionally, in Utility Model Application No. 53-16468, one end of a spring is used as a point of action, the other end is fixed to the end of the first piece of an L-shaped lever, and the corner of the L-shaped lever is A screw-locked spring adjustment device is disclosed.
To adjust the tension of the spring, loosen the screw fixing the corner of the L-shaped lever, and rotate the end of the second piece of the L-shaped lever about this screw as a fulcrum. Then, the L-shaped lever is fixed again with a screw while holding it at a point where appropriate tension can be obtained.

However, in this conventional example, the tension of the spring is always applied to the end of the first piece of the L-shaped lever, so a large rotational force is applied to the screw that fixes the corner of the L-shaped lever. . Therefore, if the screw is loosened even a little, the L-shaped lever will rotate due to the tension of the spring, causing a problem in that the tension of the spring will decrease.

(Purpose of the invention) The present invention was made in view of the above-mentioned points, and its purpose is to provide a spring in which the tension of the spring can be easily adjusted, and in which the tension of the spring does not easily fluctuate after adjustment. The objective is to provide an adjustment device for

(Disclosure of the invention) In order to achieve the above object, the spring adjusting device according to the invention has the following features as shown in the attached drawings: It is provided with round shaft parts 23 and 24 whose centers coincide with each other, and between these pair of round shaft parts 23 and 24,
A square part 21 having a regular polygonal cross-sectional shape, the center of the regular polygon coincides with the center of each of the round shaft parts 23 and 24, and has a larger cross-sectional shape than each of the round shaft parts 23 and 24, an adjustment shaft 20 including an eccentric shaft portion 22 in a part of the square portion 21 in the longitudinal direction whose center does not coincide with the round shaft portions 23 and 24; (b) a cross-sectional shape of the square portion 21; Same-shaped recess 1
( c) A bearing hole for pivotally supporting the other of the pair of round shaft parts 24 so as to be slidable in the longitudinal direction of the adjustment shaft 20, and at least a position where the square part 21 is fitted into the recess 11; and the recess 11
(d) a second fixing plate 4 disposed opposite to the first fixing plate 5 so that the adjustment shaft 20 can be slid longitudinally between the It is arranged around the round shaft part 24 which is pivotally supported in the bearing hole of the fixed plate 4, and one end is connected to the square part 21.
, and the other end is brought into contact with a surface of the second fixing plate 4 facing opposite to the first fixing plate 5, and the adjustment shaft 20 is (e) a coil spring 1 biasing the mold part 21 in the direction in which the mold part 21 is fitted into the recess 11; The eccentric shaft portion 2 is engaged with a point of action separated in the direction
2 and a spring 2 whose tension is adjusted according to the distance between the spring 2 and the point of application.

Since the present invention is constructed in this way, when adjusting the force of the spring 2, the adjustment shaft 2
0 in the axial direction against the force of the coil spring 1 to separate the square part 21 of the adjustment shaft 20 from the recess 11, and after rotating the adjustment shaft 20,
The square portion 21 of the adjustment shaft 20 may be inserted into the recess 11 again. In this way, the position of the eccentric shaft portion 22 changes, so the force applied to the point of action of the spring 2 changes.

The illustrated embodiment will be described below.

FIG. 1 is a sectional view of an embodiment of the present invention. FIG. 2a shows a fixing piece 10 screwed onto the first fixing plate 5.
Figures b and c are a front view and a right side view of the same, respectively. A positioning boss 12 that is fitted into a positioning recess of the fixed plate 5 is protruded from one end of the fixed piece 10, and a female screw hole for screwing onto the fixed plate 5 is provided at the other end. 13
is provided. A square recess 11 is provided in the center of the fixed piece 10. As shown in FIG. 1, the fixing piece 10 is positioned by a positioning boss 12 and fixed to the fixing plate 5 by a screw 50.

FIG. 3a shows the adjustment shaft 20 used in this embodiment.
FIG. 3B is a front view of the same, FIG. Further, FIG. 3d is a sectional view taken along line A-A' in FIG. 3a.
A pair of round shaft parts 23 and 24 having a circular cross-sectional shape are provided at both ends of the adjustment shaft 20, and one round shaft part 23 is fitted into the bearing hole of the first fixed plate 5. The other round shaft portion 24 is connected to the second fixing plate 4
It is inserted into the bearing hole of. The center part of the adjustment shaft 20 is a square part 21 having a square cross-section, and one end of the square part 12 can be inserted into the recess 11 of the fixing piece 10. An eccentric shaft portion 22 having a cross-sectional shape as shown in FIG. 3d is provided near the other end of the square portion 21. One end of the spring 2 is engaged with the eccentric shaft portion 22 . The other end of the spring 2 is engaged with a point of action (screw 36) fixed to a support plate 35 of the motor 3. In this embodiment, this motor 3 is biased by a spring 2.

To adjust the tension of the spring 2, insert the tip of a flathead screwdriver into the groove 25 for the flathead screwdriver provided at one end of the adjustment shaft 20, and rotate the adjustment shaft 20 while pushing in the screwdriver. It is something. If the pushing stroke of the driver is greater than the depth of the recess 11 of the fixed piece 10, the adjustment shaft 20
can be rotated freely. In addition, a colored part 26 as shown in the shaded area in FIG. 3b is provided in the part of the adjustment shaft 20 where the groove 25 is formed, so as to display the position of the adjustment shaft 20. do. The fixed plate 5 has this colored part 2
6, if a display board is provided that displays the magnitude of the load on the second spring 2 in four stages, the adjustment work will be facilitated.

In addition, in the explanation of the embodiment, a square was given as an example of a regular polygon, but if a regular N-gon shape (N is an integer of 3 or more) is used, adjustment can be made in steps of (360/N) degrees. , In this case, fine adjustment in N stages is possible. Furthermore, by changing the amount of eccentricity of the eccentric shaft portion 22, the adjustment range can be freely set.

In addition, in the embodiment, the first fixing plate 5 has a fixing piece 1.
The recess 11 is provided in the first fixed plate 5 by screwing the recess 11 into the first fixing plate 5.
It goes without saying that it may be formed integrally with the fixing plate 5 of.

(Effect of the invention) According to the invention, an eccentric shaft is provided at a position eccentric from the center position of the adjustment shaft, and one end of the spring is engaged with this eccentric shaft, so that by rotating the adjustment shaft, , the force of the spring can be adjusted, and the adjusting shaft is provided with a square part having a regular polygonal cross section, and this square part can be freely inserted into the recess of the fixing plate; Since a coil spring is provided that biases the adjusting shaft in the direction in which the adjusting shaft is inserted into the recessed portion, the adjusting shaft can be easily and reliably rotated and fixed after the rotational operation, and the action of the eccentric shaft portion is Together with this, the tension of the spring can be adjusted easily and reliably, and after the adjustment work is completed, the square part of the adjustment shaft is inserted into the recess of the fixing plate, so that the adjustment shaft can be adjusted easily and reliably. It is possible to reliably prevent the spring from rotating due to the force of the spring, and there is an effect that there is no possibility that the tension of the spring will fluctuate as in the above-mentioned conventional example.

[Brief explanation of the drawing]

Figure 1 is a sectional view of an embodiment of the present invention, Figure 2a
is a plan view of the fixing piece used in the above embodiment;
is a front view of the same as above, figure c is a right side view of the same as above, 3rd
Figure a is a front view of the adjustment shaft used in the above embodiment, Figure b is a plan view of the same, Figure c is a left side view of the main parts of the same, and Figure 3 d is a line A-A' in Figure a. FIG. 1 is a coil spring, 2 is a spring, 4 and 5 are fixed plates, 11 is a recessed portion, 20 is an adjustment shaft, 21 is a square portion, 22 is an eccentric shaft portion, and 23 and 24 are round shaft portions.

Claims (1)

[Claims for Utility Model Registration] Each of the two ends in the longitudinal direction is provided with a round shaft portion having a circular cross-sectional shape and whose centers coincide with each other, and between the pair of round shaft portions, the cross-sectional shape is a regular polygon. , the center of the regular polygon coincides with the center of each of the round shaft parts,
and an adjustment shaft comprising a square part having a larger cross-sectional shape than each of the round shaft parts, and an eccentric shaft part having a longitudinal part of the square part whose center does not coincide with each of the round shaft parts; Equipped with a recess that has approximately the same shape as the cross-sectional shape of the mold part,
a first fixing plate having a bearing hole in the center of the recess for pivotally supporting one of the pair of round shafts so as to be slidable in the longitudinal direction of the adjustment shaft; The adjustment shaft has a bearing hole that pivots so as to be slidable in the longitudinal direction of the adjustment shaft, and the adjustment shaft is moved longitudinally between at least a position where the square part is fitted into the recess and a position where the square part is removed from the recess. The first
a second fixing plate disposed opposite to the fixing plate; and a second fixing plate disposed around a round shaft part pivotally supported in a bearing hole of the second fixing plate, one end of which is connected to the second fixing plate in the square part. is in contact with the end facing the fixed plate, and the other end is in contact with the second end.
a coil spring that comes into contact with a surface of the fixing plate facing opposite to the first fixing plate and biases the adjustment shaft in a direction in which the square part is fitted into the recess; a spring whose other end is engaged with a point of action spaced apart in a direction substantially perpendicular to the longitudinal direction of the adjustment shaft, and whose tension is adjusted according to the distance between the eccentric shaft portion and the point of action; A spring adjustment device comprising: