JP2001065233A - Door closer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily adjust a spring force by providing an adjusting shaft part for fixing an inside end part of a spiral spring in a spring adjusting part for adjusting spring force of the spiral spring, and providing a resistor for imparting rotational resistance to rotation of this adjusting shaft part. SOLUTION: An O-ring 6 as a resistor is vertically interposed in a multistage shape in cylindrical clearance formed between an outer peripheral surface of a support shaft 4 and an inner peripheral surface of an adjusting shaft 5. The adjusting shaft 5 penetrates through a drum 8, and an adjusting lever 16 as an rotational operation part is arranged in the tip part projecting from an end surface of the drum 8 so as to integrally rotate with the adjusting shaft 5. This adjusting lever 16 is composed of a plate spring elastically deformable in the shaft direction of the adjusting shaft 5, the base end part relatively irrationally engages with a step part of the tip part of the adjusting shaft 5, and slipping-out from the adjusting shaft 5 is prevented by a machine screw 17 thread-mounted on the tip part of the support shaft 4. A spiral spring 7 is wound up by rotating such an adjusting lever 16 in the clockwise direction to strengthen the spring force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mainspring spring for a sliding door for automatically closing a door by urging the sliding door in a closing direction by the operation of opening the sliding door. Regarding door closers.

[0002]

2. Description of the Related Art Conventionally, as this type of door closer,
2. Description of the Related Art A mainspring type door closer equipped with a mainspring that is charged by opening a sliding door and biases the sliding door in a closing direction is known.

The door closer includes a drum having a built-in mainspring and an outer end (outer end) fixed to the drum. A cord such as a wire is wound around the drum with one end connected thereto. . Then, when the sliding door is opened, the cord body is extended from the drum, and the spring is charged in accordance with the rotation of the drum, and the sliding door is urged in the door closing direction by the stored force. Thereafter, when the hand is released from the opened sliding door, the drum rotates in the reverse direction due to the accumulated force of the mainspring, and the rotation of the drum winds up the cord, and the sliding door is automatically closed.

[0004] Further, there is also a device provided with a spring adjusting portion for adjusting a spring force of a mainspring. The spring adjustment unit is
The inner end (center end) of the mainspring has an adjustment shaft that is fixed, and by rotating the adjustment shaft, the mainspring can be wound up or down to adjust the spring force of the mainspring. I have.

[0005] By adjusting the spring force, the accumulating force of the mainspring spring when the sliding door is open can be increased or decreased, and the spring force can be increased or decreased according to the weight of the sliding door, or the closing speed of the sliding door can be changed.

In order to rotate the adjustment shaft, a tool such as a screwdriver is used, or an adjustment lever that rotates integrally with the adjustment shaft is provided in the spring adjustment portion, and the lever is rotated by hand. Done.

[0007]

On the other hand, the adjusting shaft is urged by the mainspring to rotate in a direction in which the mainspring rewinds. Therefore, when increasing the spring force, the adjusting shaft is opposed to the spring force of the mainspring. The adjustment shaft will be rotated.

However, in the related art, if the operator accidentally removes the hand from a tool or lever while rotating the adjustment shaft, the spring is released and the adjustment shaft is reversed at a high speed, causing the spring to rapidly move. Will rewind. Therefore, the mainspring rewinds more than the state where the spring force adjustment is started, and it is necessary to perform the spring force adjustment again from the beginning. Therefore, it is necessary to adjust the spring force very carefully, and there is a problem that the adjustment of the spring force is inconvenient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object the possibility that the spring may be released due to accidental release of the hand during adjustment of the spring force of the spring. Even in such a case, it is an object of the present invention to provide a door closer that allows the adjustment shaft portion to rotate gently so that the spring force can be easily and safely adjusted.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and a door closer according to the present invention is provided with a mainspring which is charged by opening a sliding door to urge the sliding door in a closing direction. 7, and a spring adjusting portion for adjusting the spring force of the mainspring 7. The spring adjusting portion includes an adjusting shaft 5 to which the inner end of the mainspring 7 is fixed.
A door closer that is configured to adjust the spring force of the mainspring spring 7 by rotating the adjustment shaft 5 to wind up or rewind the mainspring spring 7. It is characterized by comprising a resistor 6 for giving a resistance.

In the door closer according to the present invention, the spring force of the mainspring 7 is increased when the adjusting shaft 5 is rotated so as to wind up the spring 7, and the spring force is reduced when the adjustment shaft 5 is turned back. it can.

The adjusting shaft 5 is urged by the mainspring 7 so as to rotate in a direction in which the mainspring 7 rewinds. Therefore, when increasing the spring force, the adjustment shaft portion 5 is rotated against the spring force of the mainspring 7. However, since the resistor 6 gives a rotation resistance to the rotation of the adjustment shaft portion 5, the operation Even if the user releases the hand by mistake, the rotation of the adjustment shaft 5 is suppressed by this rotational resistance, the adjustment shaft 5 rotates slowly, and the spring 7 gradually rewinds. Will be. The released state means a state in which a force for maintaining the wound state of the mainspring 7 from outside is not acting on the mainspring 7.

Therefore, even if the rotation operation is erroneous, the adjustment can be resumed without panic, and the spring force can be adjusted without worrying more than necessary. Further, when the spring force is weakened, the adjustment shaft 5 is gradually rotated by the rotation resistance of the resistor 6, so that the rotation of the adjustment shaft 5 is stopped at the stage where the adjustment shaft 5 is returned to a desired state. The spring force adjustment can be completed.

If the adjustment spring 5 is excessively rotated by adjusting the spring force and the mainspring 7 is excessively wound in the closed state, the effective number of windings of the mainspring 7 may be exceeded when the mainspring 7 is charged by opening the door. It may cause a failure. Therefore, it is preferable to provide a limiting means for limiting the adjustment range of the spring force of the mainspring 7, thereby preventing the spring 7 from being damaged by excessively rotating the adjustment shaft portion 5 by mistake.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The door closer according to the present embodiment includes a spring that is charged by the opening of the sliding door and biases the sliding door in the door closing direction, and a spring adjustment unit that adjusts a spring force of the spring. It comprises an adjustment shaft to which the inner end of the mainspring is fixed, and a rotation operation unit configured to be rotatable by hand for rotating the adjustment shaft. Hereinafter, a specific description will be given.

1 and 2, reference numeral 1 denotes a mounting plate for mounting a door closer. The mounting plate 1 is bent at one end in the opening and closing direction of the sliding door (the left-right direction in FIG. 1) to form a bent portion 1a. Is formed, and is formed in an L-shape as a whole. The mounting plate 1 has a mounting screw 2
Are formed at vertically symmetric positions.

A support shaft 4 is fixed to the mounting plate 1 by caulking the base end thereof or the like.
Is located at the center of the mounting plate 1 in the vertical direction. The support shaft 4
, A cylindrical adjustment shaft 5 is inserted as the adjustment shaft portion, and the adjustment shaft 5 is supported by a support shaft 4. Also,
The outer peripheral surface of the support shaft 4 and the adjustment shaft 5
A gap is formed between the O-ring 6 and the inner peripheral surface of the O-ring 6, and an O-ring 6 as a resistor is interposed in multiple stages in the cylindrical gap.

On the other hand, a drum 8 incorporating a mainspring 7
Are supported by the adjustment shaft 5 via two bearings 9, 9 on the base end side and the distal end side. The spring 7
The outer end (outer peripheral end) is fixed to the drum 8, and the inner end 7 a (center end) is fixed to the adjustment shaft 5.

The drum 8 is formed with flange portions 8a at both ends in the axial direction.
a, a wire body 10 such as a wire
Is wrapped around. The cord body 10 has a proximal end 1
0b is fixed to the drum 8 and is wound around the peripheral wall portion 8b a predetermined number of times so as not to overlap with each other. The roller 11 is wound around the roller 11 positioned between the drum 8 and the bent portion 1a of the mounting plate 1 at a predetermined angle, is set in a horizontal posture, and penetrates the through hole 1b of the bent portion 1a. Part 10
a is formed in a ring shape, and is prevented from falling out of the through hole 1b to the drum 8 side by the washer 12 being attached.

The through hole 1b is formed at the center of the door closer in the vertical direction, and as shown in FIG.
It is formed in a long slot shape along the bending direction of a (the rotation center axis direction of the drum 8). That is, the vertical pull-out position of the cord body 10 substantially coincides with the rotation center of the drum 8 and is located between the upper and lower mounting holes 3.
In other words, even when the door closer is mounted in a state where the door closer is left-right reversed, the mounting position is a vertically symmetric mounting position from the pull-out height so that the pull-out height of the cord 10 does not change. The hole 3 is provided.

On the other hand, a description will be given of the proximal end 10b side of the cord body 10. First, as shown in FIG. 3, one flange 8a of the drum 8 (in this embodiment, the flange on the proximal end side of the adjustment shaft 5). 8a), a plurality of through holes 13 and blind holes 14
Are formed. The plurality of through holes 13 are provided in the flange portion 8.
a in the thickness direction (the direction of the rotation center axis of the drum 8)
The cable body 10 is inserted through the through hole 13 so that the cable body 10 sequentially meanders back and forth.

Further, the blind hole 14 is formed as shown in FIGS.
As shown in the figure, an axial direction of the drum 8 is formed at the boundary between the flange portion 8a and the peripheral wall portion 8b, and an opening is formed on the mounting plate side end surface 8c of the drum 8, and substantially half of the opposite side is opened laterally from the peripheral wall portion 8b. Do it. Then, the proximal end 1 of the cord body 10
0b, a cylindrical terminal 15 is attached.
The terminal 15 stops in the stop hole 14 and the terminal 15 stops.
By being configured not to fall out of the
0 is locked to the drum 8.

As described above, the proximal end portion 10b of the cord body 10
Since the (fixed portion on the drum 8 side) is housed in the drum 8 without protruding into either the outside of the drum 8 or the spring spring housing space, interference with other components can be prevented and space saving can be achieved. I can do it. Moreover, the cord 10 is connected to the plurality of through holes 1.
3, it is difficult to apply a load directly to the terminal 15 even if the cord 10 is extended to the end, so that the cord 10 can be securely fixed to the drum 8 without being pulled out. Can be maintained.

On the other hand, the adjusting shaft 5 penetrates the drum 8, and an adjusting lever 16 serving as the rotation operating unit is provided at a tip end of the adjusting shaft 5 protruding from an end surface of the drum 8.
And it is provided so as to rotate integrally therewith. The adjusting lever 16 is made of a leaf spring that can be elastically deformed in the axial direction of the adjusting shaft 5, and its base end engages with the step at the distal end of the adjusting shaft 5 so as not to rotate relatively. The screw 17 screwed to the tip of the shaft prevents the shaft 5 from coming off. A rubber knob 18 is attached to the end of the adjustment lever 16 on the surface opposite to the drum 8.

As described above, the spring adjusting portion for adjusting the spring force of the mainspring 7 is constituted by the adjusting shaft 5 and the adjusting lever 16. In this embodiment, the adjusting lever 1 shown in FIG.
By rotating clockwise (in the direction of arrow P in FIG. 1), the mainspring 7 can be wound up and its spring force can be increased. Therefore, the tip end of the adjustment lever 16 is in contact with the roller support shaft 19 of the roller 11 to stop the counterclockwise rotation thereof.

The roller support shaft 19 has its base end fixed to the mounting plate 1 by caulking or the like, is provided substantially parallel to the support shaft 4, and has an engagement groove 20 formed at its front end. Have been. The engagement of the distal end of the adjustment lever 16 with the engagement groove 20 prevents the adjustment lever 16 from moving in the axial direction of the roller support shaft 19 in the normal state.

Next, the use state of the door closer having the above configuration will be described. As shown in FIG. 6, the door closer is attached to the rail 51 fixed to the upper frame 50,
With the mounting screw 2 screwed into the mounting hole 3, the mounting plate 1 is fitted into the upper and lower grooves of the rail 51, and the mounting screw 2 is
The mounting plate 1 is pressed against the front side of the upper and lower grooves and fixed by pressing the tip of the mounting screw 2 against the rail 51 by tightening. At the time of this attachment, the cord body 10
In the longitudinal direction (horizontal direction) of the rail 51. Then, the front end portion 10a of the cord 10 of the door closer is attached to the sliding door 53 suspended from the rail 51 via the two pulleys 52.

The attachment position of the distal end portion 10a of the cable body 10 is attached to the pulley 52 in FIG. 6, but may be attached to the sliding door 53 itself or to another member that moves together with the sliding door 53. In addition, it is also possible to attach a door closer to the sliding door 53 side and attach the distal end portion 10a of the cord body 10 to a fixed side of the rail 51 or the like.

On the other hand, although the sliding door 53 shown in FIG. 6 is opened to the left in the figure, the sliding door 53 that opens to the right can also be used by inverting the door closer left and right. That is, since the upper and lower mounting holes 3 are located symmetrically with respect to the pull-out height of the cord body 10, the pull-out height does not change even when the door closer is used in any of the right and left directions. The distal end portion 10a of the strip 10 can be used by attaching it to the pulley 52, which is excellent in convenience.

Further, the tip 10a of the cable body 10 is
2 and the like, as shown in FIG.
0 is preferably set in the fore-and-aft direction, so that the cable body 10 can be wound around the drum 8.
Is slightly shifted, and the cords 10 do not overlap with each other, so that contact noise between the cords 10 can be prevented. At this time, the bent portion 1 of the mounting plate 1
Since the through-hole 1b of a is elongated in the front-rear direction, there is an advantage that the through-hole 1b can be easily set obliquely with respect to the drum 8.

Note that the winding direction of the cable body 10 is
It is only necessary to be oblique to the rotation direction of
The drum 8 and the roller 11 may be slanted in addition to the slanted shape.

On the other hand, when the sliding door 53 is opened after being attached to the rail 51 in this way, the cord 10 is extended from the drum 8 in accordance with the opening operation, and the spring 8 is rotated by the rotation of the drum 8. It is accumulating. Then, the stored mainspring 7 urges the drum 8 to rotate to the opposite side, and the force acts on the sliding door 53 via the cable body 10. That is, since the mainspring 7 urges the opened sliding door 53 in the closing direction, when the sliding door 53 is released, the drum 8 reverses due to the accumulated force of the mainspring 7 and winds the cable body 10. Take, sliding door 53
Is automatically closed.

The closing speed of the sliding door 53 or the weight of the sliding door 53 that can be closed depends on the energy stored in the spring 7, and the energy is determined by the setting of the spring force of the spring 7 in the closed state. . In the door closer of the present embodiment, the spring adjuster for adjusting the spring force is provided, so that the spring force can be freely adjusted. Hereinafter, the spring force adjusting operation will be described.

In the normal state, as shown in FIGS. 1 and 2, the adjustment lever 16 is locked on the roller support shaft 19 and its rotation is stopped. Does not rotate, the adjustment shaft 5 does not rotate. Further, since the leading end of the adjustment lever 16 is engaged with the engagement groove 20, the rotation stop state is maintained even if a force in the thickness direction acts on the adjustment lever 16 carelessly.

When it is desired to increase the spring force, the knob 18 of the adjustment lever 16 is pinched and the adjustment lever 16 is rotated clockwise. By rotating the adjustment lever 16 in this manner, the engagement with the engagement groove 20 is automatically released, and the adjustment shaft 5 is also integrally rotated to wind up the spring 7. In this embodiment, the winding direction of the mainspring 7 is clockwise.

When the adjustment lever 16 is rotated until just before one rotation (approximately 350 degrees), it reaches a position where it comes into contact with the roller support shaft 19, but as shown in FIG. Then, the adjustment lever 16 is warped toward the side opposite to the drum 8 (the end of the roller support shaft 19 in the axial direction), whereby the roller support shaft 19 can be easily moved over. Then, when you release your hand from the adjustment lever 16,
The adjustment lever 16 automatically returns to the initial state without bending by the elastic restoring force, and returns to the engagement groove 2 of the roller support shaft 19.
0 is engaged.

Further, when it is desired to increase the spring force, the adjustment lever 16 may be repeatedly rotated clockwise, and one rotation of the adjustment lever 16 may be used as a minimum adjustment width to freely adjust the spring force. it can. In addition, the adjustment can be performed only by rotating the adjustment lever 16 by hand without using any tool such as a screwdriver, and the rotation operation is easy because the adjustment lever 16 has elasticity. Adjustment lever 1
6 is set as the minimum adjustment width.
And the roller support shaft 19 may be separately provided at a position symmetrical with respect to the roller support shaft 19 and the adjustment shaft 5 by 180 degrees, so that a half rotation of the adjustment lever 16 can be the minimum adjustment width. In this way, by providing a plurality of roller support shafts 19 at arbitrary positions, fine adjustment of the spring force can be further performed.

Further, since the O-ring 6 is interposed between the inner peripheral surface of the adjusting shaft 5 and the outer peripheral surface of the support shaft 4, the O-ring 6 gives the adjusting shaft 5 a rotational resistance for suppressing the rotation of the adjusting shaft 5. ,
Even if the hand is slipped during the rotation operation of the adjustment lever 16 and the adjustment lever 16 is released, the adjustment lever 16 does not suddenly reverse, and the adjustment shaft 5 receives rotational resistance from the O-ring 6. Rotate slowly. Therefore, the adjusting lever 16, which is a part to be rotated by hand, also rotates at a low speed, which is safe for the operator. Also, even if the user releases his hand during the adjustment, there is no need to press the adjustment lever 16 with his / her hand in a hurry, so that the adjustment can be performed with confidence.

In addition, the adjusting lever 16 is connected to the roller support shaft 1.
9 and stops its rotation, so that even if you release your hand during the rotation operation, it is necessary to return less than one rotation, and the mainspring spring 7 does not rewind further beyond the adjustment start state. It can be adjusted with confidence.

On the other hand, when the spring force is weakened, the operation can be further simplified. That is, only the operation of lifting the adjustment lever 16 and moving over the roller support shaft 19 in the counterclockwise direction is performed, and thereafter, the adjustment lever 16 automatically rotates once by the bias of the mainspring 7 and contacts the roller support shaft 19. .
Therefore, the operator can automatically reduce the spring force by one rotation of the adjustment lever 16 only by this operation.

Further, since the adjustment lever 16 is gradually inverted by the rotational resistance of the O-ring 6, it is extremely safe for the operator. Even in the case of the adjustment for reducing the spring force in this way, the provision of the roller support shaft 19 as a detent for the adjustment lever 16 ensures that the spring 7 does not unwind all at once, and ensures a desired value. Can be adjusted.

Further, at the time of the adjustment for reducing the spring force, the effect of providing the adjustment lever 16 with elasticity is exerted. In other words, after the adjusting lever 16 is bent to get over the roller support shaft 19, the height automatically returns to the height at which the engaging groove 20 is engaged. Because you do.

Incidentally, the resistor is not limited to the O-ring 6, but an elastic body other than the O-ring 6 may be interposed in the sliding portion between the support shaft 4 and the adjustment shaft 5. In addition, the rotation resistance is directly applied to the adjustment shaft 5, but a resistor may be provided so as to contact the adjustment lever 16 as a rotation operation unit to apply the rotation resistance. What is necessary is just to give rotation resistance to the rotation of the adjustment shaft.

Also, as shown in FIG.
aThe door stop 21 made of an elastic body can be attached to the outside. In this case, when the sliding door 53 is closed,
As shown by a two-dot broken line in FIG.
Can come into contact with each other to exert a cushion effect.

In the above embodiment, the adjustment lever 16 is deflected away from the drum 8 so that the roller support shaft 1
9, the rotation stop state can be released. However, as shown in FIG. 9, a concave portion 22 is formed on the base end side of the engagement groove 20 of the roller support shaft 19 so that the adjustment lever 16 can pass therethrough. Then, as shown in FIG. 9B, the adjustment lever 16 may be deflected toward the drum 8 to pass through the recess 22.

Further, although the adjustment lever 16 is provided as a rotary operation unit, various other forms can be adopted, for example, a dial type as shown in FIG. In this embodiment, an adjustment dial 23 is attached to the tip of the adjustment shaft 5 in place of the adjustment lever 16,
The following configuration is employed as a detent for the adjustment dial 23. That is, a cover plate 24 is provided between the adjustment dial 23 and the drum 8 so as to be substantially horizontal to the mounting plate 1. The cover plate 24 is supported by a support between the mounting plate 1 and the shaft of the adjustment shaft 5. The position of the direction is determined.

The adjusting dial 23 is provided with at least one recess 25 that opens toward the cover plate 24. In this embodiment, a total of two concave portions 25 are formed every 180 degrees in the same circle centered on the adjusting shaft 5 (the rotation center of the adjusting dial 23), and a ball 26 is fitted into each concave portion 25. Further, a spring 27 is also inserted as a pressing means for pressing the ball 26 toward the cover plate 24. On the other hand, the cover plate 24 has
Two engagement holes 28 into which a part of the ball 26 enters are formed in the same circle as the concave portion 25 of the adjustment dial 23. The ball 26 and the engagement hole 28 function as a stopper for the adjustment dial 23.

Normally, the ball 26 is pressed by the spring 27 and a part of the ball 26 fits into each of the engagement holes 28, whereby the rotation of the adjustment dial 23 is stopped. By rotating the adjustment dial 23 by hand from this state, the spring force can be adjusted in the same manner as described above. In this case, when the adjustment dial 23 is rotated, the ball 26
Exiting 8 compresses the spring 27. At the same time, the surface of the cover plate 24 is
When the ball 6 rolls and rotates by a predetermined angle (180 degrees), the ball 26 fits into the next engagement hole 28, and at that stage, the rotation of the adjustment dial 23 stops. In order to further increase the spring force, the adjustment dial may be turned half a turn until the ball 26 fits into the next engagement hole 28.

To weaken the spring force, the adjustment dial 23 is slightly rotated to the opposite side to release the engagement of the ball 26, and thereafter the adjustment dial 23 is automatically adjusted by the spring force of the mainspring spring 7. As a result, the ball 26 fits into the other engagement hole 28 and the rotation is automatically stopped. The rotation resistance of the O-ring 6 is the same as in the above embodiment.

As described above, a detent for stopping the rotation of the rotary operation portion is provided, such as the roller support shaft 19 in the case of the adjustment lever 16, the engagement hole 28 and the ball 26 in the case of the adjustment dial 23, and the rotation stopper is provided. By adopting a configuration in which the rotation stop state of the rotation operation unit due to the rotation stop is released by the elastic deformation of the elastic members (the adjustment lever 16 and the spring 27), there is an advantage that the adjustment becomes extremely easy.

As described above, the spring force can be easily adjusted by a simple operation of rotating the rotary operating portion. However, if the rotary operating portion is excessively rotated and the mainspring spring 7 is wound up too much in the closed state, the spring can be adjusted. When the sliding door 53 is opened, the mainspring 7 breaks beyond its effective number of turns.

Therefore, it is preferable to provide a limiting means for limiting the adjustment range of the spring force of the mainspring 7.
An embodiment provided with limiting means for limiting the rotation angle or the number of rotatable adjustment shaft portions will be described. The door closer shown in FIG. 11 includes an adjustment lever 16, a cover plate 24 is provided on the front side of the drum 8, and is fixed to the mounting plate 1 by a support (not shown). Is located in front of. In order to prevent the rotation of the adjustment lever 16, a stopper pin 29 is separately provided on the cover plate 24 instead of the roller support shaft 19. It is to be noted that the adjustment lever 16 has elasticity and can bend in the thickness direction as described above.

In this embodiment, a gear shaft 30 is attached to the cover plate 24, and a substantially semicircular limiting gear 31 is supported by the gear shaft 30. On the other hand, adjustment shaft 5
In order to rotate integrally with the adjustment lever 16,
And an adjusting gear 34 connected to the adjusting lever 16 and meshing with the limiting gear 31 is attached.

The adjusting gear 34 is provided with one tooth 34a which meshes with the limiting gear 31. When the adjusting lever 16 is rotated in adjusting the spring force, the tooth 34a of the adjusting gear 34 is moved to the limiting gear 31. Then, only the predetermined angle is engaged, and after that, it rotates without engaging with the limiting gear 31. Therefore, even if the adjustment lever 16 makes one rotation, the limit gear 31 rotates only by a predetermined angle while meshing with the tooth portion 34a of the adjustment gear 34.

When the adjustment lever 16 is rotated clockwise a predetermined number of times and the mainspring spring 7 is wound up, as shown in FIG.
Is brought into contact with the adjustment gear 34, and thereafter, the adjustment lever 16 cannot be rotated clockwise. That is, this state is the upper limit of the adjustment range of the spring force.

Similarly, the adjustment lever 16 can be rotated in the reverse direction (counterclockwise) to weaken the spring force of the mainspring 7. Each time the rotation rotates in the opposite direction by a predetermined angle, the other opposite projection 32 provided on the limit gear 31 comes into contact with the adjustment gear 34. This state is the lower limit of the spring force adjustment range, and the spring force adjustment range is determined by the above upper limit.

As described above, the present embodiment is provided with the adjusting gear 34 and the limiting gear 31 as limiting means.
There is no risk of damaging the device, and a failure can be prevented before it occurs.

Next, a door closer adopting another structure as the restricting means will be described with reference to FIG. 12. In this embodiment, a linear spiral spring 3 is used as the restricting means.
5 is provided. The spiral spring 35
One end 35a (outer end) is fixed to the cover plate 24,
The other end 35b (the end on the center side) is fixed to the adjustment lever 16 and is provided in a gap between the adjustment lever 16 and the cover plate 24.
Is formed at its base end with a circular disk portion 36 centered on the adjustment shaft 5. The disk portion 36 is provided with a slit-shaped notch 37 in the radial direction so that the state of the spiral spring 35 inside the disk portion 36 can be partially glimpsed from the outside. The winding direction of the spiral spring 35 is the same as the winding direction of the spring 7 built in the drum 8.

When the adjustment lever 16 is rotated clockwise to increase the spring force, the spiral spring 35 is gradually wound around the adjustment shaft 5 and is wound up. As shown in FIG. 12B, the spiral spring 35 comes into close contact with the upper end of the adjustment range of the spring force. Thus, it is also possible to configure so that the adjustment range of the spring force is limited only to the upper limit.

Further, since the winding state of the spiral spring 35 can be confirmed from the notch 37, a guide to the upper limit of the adjustment range can be obtained. The winding state of the spiral spring 35 can be grasped more easily, and the convenience of adjusting the spring force can be further improved. The spiral spring 35
Instead, it is also possible to use a wire body such as a wire.

In the above-described embodiment, the rotary operation section is formed separately from the adjustment shaft section. However, both may be integrated, or the rotary operation section may be provided so that the operation can be performed manually. Although the configuration has been described, the configuration may be such that the rotation shaft is rotated by a tool such as a screwdriver without providing a rotation operation unit that is rotated by hand in the spring adjustment unit.

[0062]

As described above, the provision of the resistor that gives rotational resistance to the rotation of the adjusting shaft portion allows the adjusting shaft portion to be gently moved even if the hand slips during the adjustment of the spring force. Since the rotation is performed, the adjustment operation can be performed with ease without panic, and there is an effect that the adjustment can be easily performed without having to be unnecessarily careful.

[Brief description of the drawings]

FIG. 1 is a front view including a partially broken line showing a door closer according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is an exemplary bottom view of the door closer according to the embodiment including a partly broken line;

FIG. 5 is an enlarged view of a portion C in FIG. 4;

FIG. 6 is an exemplary front view showing a use state of the door closer of the embodiment;

FIG. 7 is a sectional bottom view showing the use state of the door closer of the embodiment.

FIG. 8 shows a door closer according to another embodiment, in which (a) is a front view and (b) is a side view.

9A and 9B show a door closer according to another embodiment, wherein FIG. 9A is a sectional bottom view in a normal state, and FIG. 9B is a sectional bottom view in a spring force adjusting state.

10A and 10B show a door closer according to another embodiment, wherein FIG. 10A is a front view, and FIG. 10B is a sectional view taken along line DD of FIG.

11A and 11B show a door closer of another embodiment, wherein FIG. 11A is a front view showing a state within a spring force adjustment range, and FIG. 11B is a front view showing an upper limit state of the spring force adjustment range.

FIG. 12 shows a door closer according to another embodiment, wherein (a) is a front view showing a state within a spring force adjustment range, and (b) is a front view showing an upper limit state of the spring force adjustment range.

[Explanation of symbols]

5 adjustment shaft (adjustment shaft), 6 O-ring (resistor), 7
… Spring spring

Claims (2)

[Claims] A spring that is charged by the opening of the sliding door and biases the sliding door in the closing direction; and a spring adjusting unit that adjusts a spring force of the spring. The adjustment unit has an adjustment shaft (5) to which the inner end of the spring (7) is fixed, and rotates the adjustment shaft (5) to wind up or rewind the spring (7). (7) A door closer configured to be able to adjust the spring force, the door closer comprising a resistor (6) for giving a rotational resistance to the rotation of the adjustment shaft (5). 2. The door closer according to claim 1, further comprising limiting means for limiting an adjustment range of a spring force of the mainspring.