JP2000060985A - Pressure type fire extinguisher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the cover member and its peripheral structure and improve the reliability in judgement in a pressure-type fire extinguisher designed to judge whether it is usable or not by the turning position of its upper lever. SOLUTION: A lower lever 11 has a lateral engagement hole 21, and an upper lever 13 has a second lateral engagement hole 22. A safety plug receiver 17 has a lateral engagement projection 23 adapted to slide on the lower lever 11 under elastic force until fitting in the engagement hole 21 when the upper lever 13 is gripped down to turn the safety plug receiver 17 down, and a second lateral engagement projection 23 adapted to slide on the upper lever 13 under elastic force until fitting in the second engagement hole 22 when the upper lever 13 is moved as mentioned above. Following such downward turning motion of the upper lever 13 from its standing position, the engagement projection 23 and the second engagement projection 24 of the safety plug receiver 17 come into a fit in the engagement hole 21 of the lower lever 11 and the second engagement hole 22 of the upper lever 13 respectively across the levers 11 and 13, in which state the upper lever 13 is constrained against turning motion to the lower lever 11 via the safety plug receiver 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-type fire extinguisher capable of easily and surely determining whether or not it can be used, that is, whether it is unused or used, by visually observing the appearance.

[0002]

2. Description of the Related Art The rotation of an upper lever destroys a sealing plate of a pressurized gas cylinder placed inside the container, thereby introducing the pressurized gas in the pressurized gas cylinder into the container and extinguishing the fire filled in the container. In a known pressure-type fire extinguisher configured to discharge the medicine to the outside of the container, as a method of visually judging from the appearance whether or not it can be used, see Jpn.
-1961, No. 58-13869, No. 02
No. 11089 and Japanese Patent Publication No. 03-53952 disclose that a fire extinguisher is in a used state by rotating an upper lever to a discharge operation position or destroying a sealing plate of a pressurized gas cylinder accordingly. It is disclosed that such a thing can be visually confirmed by an external display means such as a sticker, a piston body, a display body and a lamp.

However, in a fire extinguisher equipped with the external display means, the display means can be easily detached from the fire extinguisher due to a mounting structure or easily damaged due to the fire extinguisher falling down or the like. In many cases, the fire extinguisher can return to the original standby position even after the fire extinguisher is used, so the fire extinguisher can only be seen from the outside. There is a problem in that it is difficult to reliably and reliably determine whether or not to use.

On the other hand, Japanese Utility Model Publication No. 57-57713 reports that the used state of the fire extinguisher is indicated by the rotating position of the upper lever itself, without depending on the external display means. In this fire extinguisher, once the upper lever is rotated to the discharge operation position, the upper lever is mechanically fixed to the lid member of the container at that position and cannot return to the original standby position. There is an advantage that whether or not the fire extinguisher can be used can be reliably determined by visually observing the rotating position of the upper lever.

However, in the above-described fire extinguisher, the tip of the actuating rod urged by the spring comes into contact with the upper lever as the upper lever rotates to the discharge actuating position, and enters the concave portion thereof, and the actuating rod causes The upper lever is configured to be fixed to the discharge operation position in a non-returnable manner, and because of its structure, the operation rod is vertically movably fitted to the lid member of the container through a spring. When the structure of the lid member and its surroundings becomes complicated, and if the sliding state of the operating rod with respect to the lid member or the biasing state of the spring with respect to the operating rod causes inconvenience for some reason, the fixing action of the upper lever in the discharge operating position is performed. There was a problem that was lost. Further, the fire extinguisher is configured such that the unusable or used state is displayed only when the upper lever is rotated from the standby position to the discharge operation position and the sealing plate of the pressurized gas cylinder is broken. Therefore, if the upper lever is stopped from rotating before reaching the discharge operation position for some reason, it is determined that the upper lever can be used or not used as in the case where the upper lever is not rotated. was there.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to determine whether or not a fire extinguisher can be used by the turning position of the upper lever itself, and to simplify the structure of the lid member and its surroundings. Another object of the present invention is to provide a pressurized fire extinguisher with improved reliability of discrimination. Another object of the present invention is to
(EN) It is possible to provide a pressurized fire extinguisher capable of determining that the upper lever cannot be used or has been used when the rotation of the upper lever is stopped at an intermediate position before reaching the discharge operation position.

[0007]

In a first pressure-type fire extinguisher according to the present invention, a lower lever is integrated with a lid member of a container, and the upper lever is rotatable in a vertical direction. Is attached to the lid member or the lower lever via a second pivot in the lever width direction so that the safety plug receiver is pivotable in the depression direction in conjunction with the downward rotation of the upper lever. It is pivotally attached and fixed to the upper lever in the standby position by the safety stopper in an upright state, and the breaking member is inserted into the lid member so as to be able to move up and down while engaging with the upper lever. When the container is rotated downward from the standby position to the discharge operation position after releasing the fixation due to removal, the rupturing member descends with respect to the lid member in conjunction with the rotation and the pressurized gas cylinder provided inside the container. Destroys the sealing plate of the In the pressurized fire extinguisher configured to introduce the pressure gas of the inside of the container and to discharge the fire extinguishing agent filled inside the container to the outside of the container, the lower lever has an engaging hole and the upper lever has a second engaging hole. Each of them is drilled in the lever width direction, and fits into the engagement hole of the safety stopper while sliding under the elastic force of the lower lever when the safety stopper receives the downward rotation of the safety stopper as the upper lever rotates downward. Possible engaging projections and second engaging projections that can fit in the second engaging holes while sliding under elastic force with the upper lever are respectively provided in the width direction of the lever so as to project to the release operation position of the upper lever. Upon arrival, the engagement projections and second engagement projections of the safety plug receiver, the engagement holes of the lower lever and the second engagement holes of the upper lever are fitted in the lever width direction, respectively, and the upper lever is attached to the safety plug. It is characterized in that it is configured to be non-rotatably restrained by a lower lever via a receiver. There.

The engaging holes and the second engaging holes of the lower lever and the upper lever, and the engaging protrusions and the second engaging protrusions of the safety plug receiver are respectively fitted when the upper lever reaches the discharge operation position. The alignment is performed in advance so that they can be matched. For example, the engaging protrusion and the second engaging protrusion of the safety plug receiver can be fitted in the engaging hole and the second engaging hole while sliding elastically with respect to the lower lever and the upper lever, respectively. , The engaging protrusion and the second engaging protrusion, the safety plug receiver, the lower lever, the upper lever, and the like are provided with elasticity in the lever width direction.

When the upper lever is stopped from rotating for some reason before reaching the discharge operation position, the fire extinguisher in this state is also judged to be unusable or used, and it is possible to judge whether it can be used or not. In order to prevent uncertainties from entering, the engaging hole of the lower lever and the second engaging hole of the upper lever are formed as long holes along the tracks of the engaging protrusion of the safety stopper and the second engaging protrusion. When the upper lever reaches a predetermined intermediate position from the standby position to the discharge operation position, the engagement protrusion and the second engagement protrusion of the safety plug receiver, the engagement hole of the lower lever and the second protrusion of the upper lever are formed. The respective starting ends of the engaging holes are respectively fitted in the lever width direction, and the upper lever is non-rotatably restricted upward by the lower stopper while allowing the downward rotation of the upper lever via the safety stopper receiver. It can also be configured as follows.

In the above case, the upper lever reaches the predetermined intermediate position in the engaging holes and the second engaging holes of the lower lever and the upper lever, and the engaging protrusion and the second engaging protrusion of the safety plug receiver. The alignment is performed in advance so that they can be fitted to each other only for the first time. In the pressurizing fire extinguisher, the upper lever can be rotated downward toward the discharge operation position even after the engagement, so that the upper lever can be lowered from the standby position to the discharge operation position at a normal use. Does not cause any problems.

In a second pressurizing fire extinguisher according to the present invention, the lower lever is integrated with the lid member of the container, and the upper lever is rotatable in the vertical direction so that the lid member or the lower lever is pivoted in the lever width direction. The safety plug receiver is pivotally attached to the lid member or the lower lever via the second pivot shaft in the lever width direction so as to be pivotable in the depression direction in conjunction with the downward rotation of the upper lever, and is on standby. It is fixed to the upper lever in the position by the safety plug in the upright state, and the breaking member is inserted into the lid member so as to be able to move up and down while engaging with the upper lever, and after the upper lever is released from the fixing by removing the safety plug. When it is rotated downward from the standby position to the discharge operation position, the rupturing member descends with respect to the lid member in conjunction with the rotation, and the sealing plate of the pressurized gas cylinder disposed inside the container is destroyed. , Which allows the pressurized gas in the pressurized gas cylinder to In the configuration the pressurized fire extinguisher to release fire extinguishing agent is filled in a container inside is introduced inside the container outside,

An engaging hole is formed in one of the lower lever and the upper lever in the lever width direction, and the other lever slides elastically with the one lever when the upper lever rotates downward. At the same time, an engaging projection capable of fitting with the engaging hole is provided in the lever width direction, and when the upper lever reaches the discharge operation position, the engaging hole or the engaging projection of the upper lever and the engaging projection of the lower lever. Alternatively, the engaging hole is fitted in the lever width direction, and the upper lever is non-rotatably restrained by the lower lever.

The engaging hole of one of the lower lever and the upper lever and the engaging projection of the other lever are preliminarily aligned so that they can be fitted when the upper lever reaches the discharge operation position. ing. For example, the engaging protrusion of the lower lever and the upper lever may be fitted into the engaging hole of the other lever while sliding elastically with respect to the other lever. Elasticity in the lever width direction is imparted to the lever and the like.

When the rotation of the upper lever is stopped before reaching the discharge operation position for some reason, the fire extinguisher in this state is also determined to be unusable or used, and it is possible to determine whether it can be used or not. In order to prevent uncertainties from entering, one of the lower lever and upper lever engaging holes is formed as a long hole along the track of the other engaging protrusion, and it extends from the standby position to the discharge operation position. When the upper lever reaches the predetermined intermediate position, the engaging hole or engaging protrusion of the upper lever and the engaging protrusion or engaging hole of the lower lever are fitted in the lever width direction, and
The upper lever may be constrained by the lower lever so as not to rotate upward while allowing the downward rotation.

In the above case, the engaging hole of one lever of the lower lever and the upper lever and the engaging protrusion of the other lever are:
Positioning is performed in advance so that the upper lever can be fitted only when it reaches the predetermined intermediate position. The upper lever is rotatable downward toward the discharge operation position even after the engagement.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a sectional view of a main part of a pressurized fire extinguisher according to a first embodiment of the present invention before use, and FIG. 2 is a use of the pressurized fire extinguisher shown in FIG. It is a principal part sectional view afterwards. In FIG. 1, a container 1 of a pressurized fire extinguisher is filled with a fire extinguishing agent, and a lid member 2 is attached to an opening of the container 1 with a tightening cover 3. An extinguishant delivery hole 4 is arranged in the lid member 2 in an L shape, and the extinguishant delivery hole 4 communicates with the extinguishant in the container 1 through an extinguishant suction tube 5 and at the same time, an extinguishant delivery hose. 6 and the injection nozzle (not shown) at the tip thereof communicates with the outside air. Further, an operating hole 7 is vertically penetrated through the lid member 2, a cylindrical breaking member 8 is inserted into the operating hole 7 so as to be movable up and down, and a pressurized gas cylinder 9 is provided at the lower end of the operating hole 7 in a container. 1, a sharpened portion at the lower end of the rupturing member 8 and a sealing plate 10 that seals the mouth of the pressurized gas cylinder 9 are arranged in opposition to each other in the working hole 7, and the working hole 7 is the mouth of the pressurized gas cylinder 9 Above, it communicates with the inside of the container 1 via a passage inside the lid member 2 and a gas introduction pipe (neither is shown).

Further, the lower lever 11 is fixed to the upper portion of the lid member 2 by the pin 12 and other members, and the lower lever 1
1 The upper lever 13 is pivotally attached to the front end via a pin 14 in the lever width direction so as to be rotatable in the vertical direction, and the bent portion 15 at the lower edge of the upper lever 13 connects the small diameter portion 16 at the upper end of the breaking member 8 and It is engaged so as to be loosely sandwiched from both sides. Further, the safety plug receiver 17 is pivotally attached at one end thereof to the middle portion of the lower lever 11 via a pin 18 in the lever width direction, and is slidably contacted to the top plate of the upper lever 13 at the other end.
A safety plug 19 penetrates the top plate of the upper lever 13 and is detachably fitted therein.

Further, the side surface of the lower lever 11 has an engaging hole 21,
The second engaging holes 22 are formed in the side surface of the upper lever 13 in the lever width direction, and the lower lever 1 is formed in the side surface of the safety plug receiver 17.
An engaging projection 23 that can be fitted into the engaging hole 21 of No. 1 and a second engaging projection 24 that can be fitted into the second engaging hole 22 of the upper lever 13 are provided so as to project in the lever width direction. The engaging protrusions 23 and the second engaging protrusions 24 of the lower lever 11 and the upper lever 13 are fitted into the engaging holes 21 of the lower lever 11 and the second engaging holes 22 of the upper lever 13, respectively. Are slidably contacted to the inner side surfaces of the safety plug receiver 17 under the elasticity of the lever width direction applied to the safety plug receiver 17 itself.

In the above structure, when the safety plug 19 is pulled out, the upright safety plug receiver 17 can be turned in the depression direction, and the fixation of the upper lever 13 to the lower lever 11 is released. When the upper lever 13 is rotated downward from the standby position to the discharge operation position, as shown in FIG. 2, the rupturing member 8 descends in the operation hole 7 in conjunction with the rotation and the pressurized gas cylinder 9 port is opened. The sealing plate 10 of the part is destroyed, whereby the pressure gas in the pressurized gas cylinder 9 is introduced into the container 1 and the extinguishing agent inside the container 1 is discharged to the outside of the container 1 via the extinguishing agent delivery hose 6 and the like. It

Further, the upper lever 13 downward from the standby position
With the above rotation, the safety plug receiver 17 receives a clockwise rotational force from the upper lever 13, and the engagement protrusion 23 and the second engagement protrusion 24 of the safety stopper receiver 17 elastically act on the lower lever 11 and the upper lever 13, respectively. When the upper lever 13 reaches the discharge operation position by sliding it downward and pivoting in the depression direction, as shown in FIG. 2, the engaging protrusion 23 and the second engaging protrusion 24 of the safety plug receiver 17 and the lower engaging protrusion 24 are lowered. The engaging hole 21 of the lever 11 and the second engaging hole 22 of the upper lever 13 are respectively fitted, the safety plug receiver 17 is non-rotatably restrained by the lower lever 11, and the upper lever 13 is held by the safety plug receiver 17. It is constrained by the lower lever 11 so as not to be rotatable.

[Second Embodiment] FIG. 3 is a sectional view of a main part before use of a pressurized fire extinguisher according to a second embodiment obtained by partially modifying the design of the embodiment shown in FIG. 1, and FIG. It is a principal part sectional view after using the pressurization type fire extinguisher shown in FIG.

In the second embodiment, as shown in FIG. 3, the engaging hole 21 of the lower lever 11 and the second engaging hole 22 of the upper lever 13 are different from those of the first embodiment in the safety stopper. Receiving 17
Of the engaging projection 23 and the second engaging projection 24 are formed in a long hole, so that the upper lever 13 reaches the discharge operation position, that is, the breaking member 8 as shown in FIG. Before the sealing plate 10 at the mouth of the pressurized gas cylinder 9 is broken by, the engagement projection 23 and the second engagement projection 24 of the safety plug receiver 17, the engagement hole 21 of the lower lever 11 and the second engagement of the upper lever 13 are engaged. Hole 2
The safety plug receiver 17 is fixed to the lower lever 11 so as not to rotate in the upright direction and the upper lever 13 moves downward via the safety plug receiver 17 so as not to rotate. It is restrained by the lever 11. The safety plug receiver 17 is rotatable in the depression direction even after the fitting, and the upper lever 13
Is rotatable downward from the intermediate position to the discharge operation position.

[Third Embodiment] FIG. 5 is a sectional view of a main part of a pressurized fire extinguisher according to a third embodiment of the present invention before use.
FIG. 6 is a cross-sectional view of a main part of the pressurized fire extinguisher shown in FIG. 5 after use.

In the third embodiment, the upper lever 13 is restrained by the lower lever 11 through the safety plug receiver 17 by the engagement of the engaging hole and the engaging projection as in the first embodiment. ,
The upper lever 13 is directly restrained by the lower lever 11 by fitting the engaging hole and the engaging protrusion. That is, in FIG. 5, the upper lever 13 is provided with an engagement hole 25 in the lever width direction, and the lower lever 11 is provided with an engagement projection 26 that can be fitted into the engagement hole 25 of the upper lever 13 in the lever width direction. The engaging protrusion 26 of the lower lever 11 is provided on the inner surface of the upper lever 13 until the engaging protrusion 26 of the lower lever 11 is fitted into the engaging hole 25 of the upper lever 13 and / or in the lever width direction of the upper lever 13. It is slid under the elasticity of.

In the above structure, the safety stopper receiver 17 receives a clockwise rotational force from the upper lever 13 and rotates in the depression direction as the upper lever 13 rotates downward from the standby position. 13 is the engaging protrusion 2 of the lower lever 11.
When the upper lever 13 reaches the discharge operation position, the upper lever 1 slides elastically downward with respect to 6, as shown in FIG.
3 and the engaging projection 26 of the lower lever 11 are fitted together, and the upper lever 13 cannot be rotated.
Being bound by.

[Fourth Embodiment] FIG. 7 is a cross-sectional view of an essential portion of a pressurized fire extinguisher according to a fourth embodiment of the present invention shown in FIG. FIG. 8 is a cross-sectional view of the essential parts after the use of the pressure-type fire extinguisher shown in FIG. 7.

In the fourth embodiment, as shown in FIG. 7, the engaging hole 25 of the upper lever 13 is different from that of the third embodiment in that the engaging projection 26 of the lower lever 11 is elongated along the track. As a result, as shown in FIG. 8, before the upper lever 13 reaches the discharge operation position, that is, before the sealing plate 8 at the mouth of the pressurized gas cylinder 9 is broken by the breaking member 8, the upper lever 13 is The starting end of the engaging hole 25 and the engaging protrusion 26 of the lower lever 11 are fitted together, and the upper lever 13 is constrained upward by the lower lever 11 so as not to rotate. The upper lever 13 is pivotable downward from the intermediate position to the discharge operation position.

[0028]

The pressurizing fire extinguisher according to the present invention is constructed as described above, and the upper lever is fixed to the lower lever in the discharge operation position by utilizing the existing safety stopper receiver or not. The structure of the lid member and its surroundings can be simplified and the reliability of the determination as to whether or not it can be used can be improved.

If the upper lever is prohibited from rotating upward at a predetermined intermediate position from the standby position to the discharging operation position, it is impossible to understand the substance of the upper lever being in the predetermined intermediate position for some reason. It is possible to determine that the pressurized fire extinguisher has been used and prevent uncertainties from being involved in determining whether or not it can be used.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a pressurized fire extinguisher according to a first embodiment of the present invention before use.

FIG. 2 is a cross-sectional view of an essential part of the pressurized fire extinguisher shown in FIG. 1 after use.

FIG. 3 is a cross-sectional view of a main part of a pressurized fire extinguisher according to a second embodiment obtained by partially modifying the design of the embodiment shown in FIG. 1 before use.

FIG. 4 is a cross-sectional view of an essential part of the pressurized fire extinguisher shown in FIG. 3 after use.

FIG. 5 is a sectional view of a main part of a pressurized fire extinguisher according to a third embodiment of the present invention before use.

FIG. 6 is a cross-sectional view of a main part of the pressurized fire extinguisher shown in FIG. 5 after use.

FIG. 7 is a cross-sectional view of a main part of a pressurized fire extinguisher according to a fourth embodiment obtained by partially modifying the design shown in FIG. 5 before use.

FIG. 8 is a cross-sectional view of an essential part of the pressurized fire extinguisher shown in FIG. 7 after use.

[Explanation of symbols]

1 container 2 Lid member 6 Fire extinguisher delivery hose 8 Breaking member 9 pressurized gas cylinders 10 sealing plate 11 Lower lever 13 Upper lever 17 Safety stopper receiver 21 Engagement hole 22 Second engagement hole 23 Engagement protrusion 24 Second engagement protrusion

Claims (4)

[Claims] 1. A lower lever is integrated with a lid member of a container, and an upper lever is pivotally attached to a lid member or a lower lever via a pivot in a lever width direction so as to be rotatable in a vertical direction. The upper lever is pivotally attached to the lid member or the lower lever via the second pivot in the lever width direction so as to be rotatable in the depression direction in conjunction with the downward rotation of the upper lever, and is erected by the safety stopper on the upper lever in the standby position. And the rupturing member is inserted into the lid member so that it can be moved up and down while engaging with the upper lever, and the upper lever is pivoted downward from the standby position to the discharge operation position after the fixing is released by removing the safety plug. When this is done, the rupturing member descends with respect to the lid member in conjunction with the rotation, and the sealing plate of the pressurized gas cylinder disposed inside the container is destroyed, whereby the pressurized gas in the pressurized gas cylinder is released. Introduce into the container and fill the container In a pressure-type fire extinguisher configured to release the filled fire extinguishing agent to the outside of the container, an engaging hole is formed in the lower lever and a second engaging hole is formed in the upper lever in the lever width direction, and a safety plug is also provided. When the upper stopper moves downward in the depression direction of the safety stopper when the upper lever rotates downward, the receiving protrusion slides elastically with the lower lever and engages with the engaging hole, and the upper lever slides downward with elastic force. The second engaging projections that can be fitted into the second engaging holes while moving are provided to project in the lever width direction, and when the upper lever reaches the discharge operation position, the engaging projections and the second The engaging protrusion, the engaging hole of the lower lever and the second engaging hole of the upper lever are respectively fitted in the lever width direction, and the upper lever is non-rotatably restrained by the lower lever via the safety stopper receiver. A pressure-type fire extinguisher characterized by being configured as described above. 2. The lower lever engaging hole and the upper lever second engaging hole are formed as elongated holes along the tracks of the engaging protrusion and the second engaging protrusion of the safety plug receiver, and are discharged from the standby position. When the upper lever reaches a predetermined intermediate position up to the operating position, the engaging protrusion of the safety plug receiver and the second engaging protrusion, the engaging hole of the lower lever and the starting ends of the second engaging hole of the upper lever, Are fitted in the lever width direction, respectively, and the upper lever is constrained by the lower lever so as not to rotate upward while allowing downward rotation through a safety plug receiver. Pressurized fire extinguisher described. 3. The lower lever is integrated with the lid member of the container, and the upper lever is pivotally attached to the lid member or the lower lever via a pivot in the lever width direction so as to be rotatable in the up-down direction. The upper lever is pivotally attached to the lid member or the lower lever via the second pivot in the lever width direction so as to be rotatable in the depression direction in conjunction with the downward rotation of the upper lever, and is erected by the safety stopper on the upper lever in the standby position. And the rupturing member is inserted into the lid member so that it can be moved up and down while engaging with the upper lever, and the upper lever is pivoted downward from the standby position to the discharge operation position after the fixing is released by removing the safety plug. When this is done, the rupturing member descends with respect to the lid member in conjunction with the rotation, and the sealing plate of the pressurized gas cylinder disposed inside the container is destroyed, whereby the pressurized gas in the pressurized gas cylinder is released. Introduce into the container and fill the container In a pressurized fire extinguisher configured to release the filled fire extinguishing agent to the outside of the container, an engaging hole is formed in one lever of the lower lever and the upper lever in the lever width direction, and at the other lever, When the upper lever rotates downward, an engaging projection that can fit in the engaging hole while sliding under the elastic force of the one lever is projected in the lever width direction, and when the upper lever reaches the discharge operation position. The upper lever engaging hole or engaging projection and the lower lever engaging projection or engaging hole are fitted in the lever width direction, and the upper lever is non-rotatably restrained by the lower lever. Pressurized fire extinguisher that is characterized. 4. An upper lever at a predetermined intermediate position between a standby position and a discharge operation position, in which one of the lower lever and the upper lever has an engaging hole formed along the track of the other engaging protrusion. When the upper lever is reached, the engaging hole or the engaging projection of the upper lever and the engaging projection or the engaging hole of the lower lever are fitted in the lever width direction, and the upper lever moves upward while allowing downward rotation. The pressurizing fire extinguisher according to claim 3, wherein the lower lever is non-rotatably restrained.