JP4047985B2 - Coupling mechanism of door operation member and square shaft - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a coupling mechanism (hereinafter simply referred to as a coupling mechanism) between an operating member of a door such as a handle and a square shaft.
[0002]
[Prior art]
The gap between the lever handle, knob or other operation member attached to the door and one end of the square shaft linked to the latch bolt of the lock box is disclosed in Japanese Utility Model Publication No. 58-32516 or Japanese Utility Model Publication No. 62-24687. As shown, it is very common to detachably fix with a set screw which is screwed onto the operating member and whose tip is pressed against the receiving groove of the square shaft.
[0003]
The coupling mechanism of such a structure considers the set screw as an elastic body having a large spring constant, and presses the set screw itself against the thread of the female screw formed on the operating member by the large elastic force generated by the slight elastic deformation, so that the male and female The frictional force generated between the two screw threads prevents the set screw from rotating in the slack direction.
[0004]
However, if the external force due to the impact or vibration applied to this coupling mechanism loosens the set screw, the frictional force between the male and female threads is reduced by the slight rotation of the set screw. It will disappear.
[0005]
Therefore, the applicant of the present invention firstly, for example, in Japanese Patent Application No. 6-13860, a leaf spring is straddled between a rotary action member such as a retractor in the lock box and the handle, and the central portion of the leaf spring is arranged. A coupling mechanism that presses and elastically deforms with a set screw and presses both ends of the handle and the rotating member has been proposed.
[0006]
The coupling mechanism having such a structure has an advantage that the coupling between the square shaft and the handle is stable because a slight loosening of the set screw hardly affects the amount of elastic deformation of the leaf spring.
[0007]
[Problems to be solved by the invention]
The above-mentioned coupling mechanism proposed by the applicant of the present invention has, of course, exhibited a desired function and is practically used. However, on the other hand, it forms a slit for mounting a leaf spring on at least the angular axis, or the angular axis. Needs to be divided into two triangular axes having a triangular cross section, and a groove for accommodating the leaf spring must be formed on these joint surfaces.
[0008]
In other words, it is inevitable to process the square shaft, and it is necessary to prepare a leaf spring as a separate member. In short, the structure of the coupling mechanism must be complicated.
[0009]
Further, since the angular axis is divided into two or formed with a slit, there is a disadvantage that the torsional strength and torsional rigidity of the angular axis are reduced.
[0010]
The present invention provides a coupling mechanism that not only keeps the coupling between the square shaft and the door operation member stable, but also has a simple structure and is easy to manufacture, and can improve the torsional strength and rigidity of the square shaft. It is intended to provide.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a door operating member on the indoor side that fits with an end on the indoor side of the angular axis, and a ridge portion of the angular axis passing through the base of the door operating member. And has a set screw with a tapered surface at its inner end, and the ridge of the angular shaft facing the inner end of this set screw is cut away, and the cross section is U-shaped , almost the same as the outer diameter of the set screw An engagement groove having the same width is formed, and the center of the engagement groove in the width direction and the center axis of the set screw are relatively shifted so that the taper surface of the set screw interferes with the opening edge of the engagement groove. Thus , when the set screw is screwed, the angular axis is twisted, bent, or elastically deformed in the direction in which the engagement groove is expanded .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a lever handle, a knob, and other indoor operation members that are detachably attached to the inner end of the angular shaft 2 by the coupling mechanism according to the present invention.
[0013]
An outdoor operation member 3 is attached to the outer end portion of the square shaft 2 and is fixed to the square shaft 2 by caulking the pins 4 or the like.
[0014]
The bases of the outdoor and indoor operation members 1 and 3 are respectively formed with insertion holes 5 having a square cross-sectional shape, and both ends of the square shaft 2 are fitted into the corresponding operation member insertion holes 5 respectively. Is the same as the conventional coupling mechanism.
[0015]
Further, the square shaft 2 passes through the door 6 and the lock box 7, and the central portion thereof is linked to a latch bolt (not shown) through a rotating action piece such as a retractor.
[0016]
A female screw hole (not shown) is formed in the base portion of the operation member 1 on the indoor side. As shown in FIG. 1, a slot that engages with, for example, a flat-blade screwdriver is formed in the female screw hole. A set screw 8 is screwed and its inner end faces the ridge of the square shaft 2.
[0017]
A tapered surface 9 that forms, for example, a cone or a part of a truncated cone is formed at the inner end of the set screw 8.
[0018]
On the other hand, the ridge portion of the square shaft 2 facing the inner end of the set screw 8, as shown in FIG. 2, is cut by, for example, cutting or plastic working, or the meat is stolen and the cross section is opened upward. A letter-shaped engagement groove 11 is formed.
[0019]
The characteristic configuration of the present invention is that the outer diameter of the set screw 8 and the width dimension of the engagement groove 11 are set substantially the same, and the center in the width direction of the engagement groove 11 and the center axis of the set screw 8 are made relative to each other. Accordingly, when the set screw 8 is screwed in, the tapered surface 9 of the set screw and the opening edge of the engagement groove 11 interfere with each other.
[0020]
In order to displace the set screw 8 and the engagement groove 11 in the latter width direction, the center axis of the set screw 8 intersects with the center axis of the operation member 1, and the engagement groove 11 Alternatively, the engaging groove 11 may be formed symmetrically with respect to the ridgeline of the angular axis, and the female screw portion that is screwed with the set screw 8 corresponding thereto from the central axis of the operating member 1. You may form so that it may remove | deviate.
[0021]
2, in other words, the amount of interference ε between the set screw 8 and the opening edge of the engaging groove in FIG. 2 is the material of the set screw 8 and the square shaft 2 or between the square shaft 2 and the insertion hole 5. Although depending on the play between them, since both are usually made of iron, 0.2 mm to 0.5 mm (粍) is preferable.
[0022]
As shown in FIG. 1, the coupling mechanism according to one embodiment of the present invention configured as described above is configured such that the indoor operation member 1 is fitted to the inner end portion of the square shaft 2 and the set screw 8 is attached by a screwdriver. Screw into the engagement groove 11.
[0023]
Then, as apparent from FIG. 2, one opening edge of the normal engagement groove 11 interferes with the tapered surface 9 of the set screw 8, but when the set screw is screwed in anyway, the set screw 8. The angular axis 2 is twisted as a result of the opening edge of the engaging groove 11 falling outside, that is, away from the tapered surface 9 in an attempt to reduce the interference with the tapered surface.
[0024]
Alternatively, due to the wedge action generated between the opening edge of the engagement groove 11 and the taper surface 9 of the set screw, the portion of the square shaft 2 that interferes with the set screw 8 moves to the right in FIG. In other words, the square axis 2 bends in the insertion hole 5 in response to a bending moment.
[0025]
As a result, as shown in FIG. 3, the inner end of the set screw 8 comes into contact with the bottom surface of the engagement groove 11, and the connection between the operation member 1 and the square shaft 2 by the set screw 8 is completed.
[0026]
The angle formed by the taper surface 9 of the set screw, in other words, the apex angle of a cone formed by extending the taper surface 9 in the apex direction along a plane including the central axis is preferably an acute angle of 90 degrees or less.
[0027]
This is because the wedge action between the opening edge of the engagement groove 11 and the tapered surface 9 of the set screw can be obtained with a small force.
[0028]
3, when the width of the engagement groove 11 is sufficiently larger than the outer diameter of the set screw 8, a gap is generated between the inner surface on the left side of the normal engagement groove 11 and the set screw 8. .
[0029]
On the other hand, on the right side of the set screw 8, a large reaction force is received from the angular shaft 2 that is twisted or bent and elastically deformed, and due to this reaction force, the set screw 8 and the female screw hole that is screwed into the screw thread are strong. Since a frictional force is generated, and a strong frictional force is also generated between the set screw 8 and the inner surface of the engagement groove 11, the loosening of the set screw 8 due to secular change, impact, etc. is effective due to these frictional forces. Is prevented.
[0030]
On the other hand, when the width of the engagement groove 11 is smaller than the outer diameter of the set screw 8, the engagement groove 11 is elastically deformed so as to expand in the width direction rather than being twisted or bent.
[0031]
Therefore, in this case, the engagement groove 11 strongly holds the inner end of the set screw 8. If it is flat, the inner end will be firmly held. The loosening of the set screw 8 due to this is effectively prevented.
[0032]
Further, as shown in FIG. 2, when an acute ridge is left on the opening edge of the engagement groove 11, the acute ridge is easily plastically deformed due to interference with the set screw 8, but the contact depth with the set screw 8. There is an advantage that it is large.
[0033]
On the other hand, when the opening edge of the engagement groove 11 is flattened by the cut surface indicated by reference numeral 12 in FIG. 3 and the opening edge is substantially parallel to the bottom surface of the engagement groove 11, the set screw 8 Therefore, there is another advantage that the function of the coupling mechanism according to the present invention does not change even when the assembly and disassembly of the door handle portion are repeated.
[0034]
【The invention's effect】
As is apparent from the above description, the present invention shifts the engagement groove having a U-shaped cross section formed at the ridge portion of the square axis and the set screw facing the engagement groove in the width direction of the former and the latter. Since the tapered surface is formed at the inner end of the shaft, a wedge action is generated between the opening edge of the engagement groove and the taper surface, and the angular axis is twisted or bent, or the engagement groove is expanded, A strong frictional force is generated between the screw threads by the force, or the inner end of the set screw is strongly held in the engagement groove, and the set screw is effectively prevented from loosening for a long period of time.
[0035]
In addition, it is possible to simplify the structure of the coupling mechanism according to the present invention in combination with the fact that a female screw hole is formed in the operation member, no other processing is required, and there is no need to prepare a leaf spring as a separate member. It is easy to manufacture as well.
[0036]
Furthermore, since the square shaft does not require other processing such as grooving or division in addition to the formation of the engagement groove, there are various effects such as improvement of the strength and torsional rigidity of the square shaft.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view of a coupling mechanism according to an embodiment of the present invention.
FIG. 2 is an enlarged cross-sectional view of the angular axis taken along line II-II in FIG. 1, showing a state before the set screw is screwed.
FIG. 3 is an enlarged cross-sectional view of the angular axis taken along line III-III in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Operation member 2 Square shaft 5 Insertion hole 8 Set screw 9 Tapered surface 11 Engaging groove 12 Cut surface

Claims (5)

A door operation member on the indoor side that fits with the indoor end of the angular axis, and a base surface of the door operation member that penetrates the inner end to face the ridge of the angular axis, and a tapered surface at the inner end A set screw is formed, and the ridge portion of the square shaft facing the inner end of the set screw is cut to form an engagement groove having a U-shaped cross section and a width substantially equal to the outer diameter of the set screw. The center of the groove in the width direction and the center axis of the set screw are relatively shifted so that the taper surface of the set screw interferes with the opening edge of the engaging groove , and the set screw is screwed in. A mechanism for coupling the door operating member and the square shaft, wherein the square shaft is twisted, bent, or elastically deformed in a direction in which the engagement groove opens .   2. The door operating member and angular shaft coupling mechanism according to claim 1, wherein an acute angle ridge is left at the opening edge of the engagement groove.   2. The door operating member / square shaft coupling mechanism according to claim 1, wherein the opening edge of the engagement groove is cut so that the opening edge is substantially parallel to the bottom surface of the engagement groove.   The door operating member and angular shaft coupling mechanism according to claim 1, wherein the width of the engaging groove is equal to or greater than the outer diameter of the set screw.   2. The door operating member / square shaft coupling mechanism according to claim 1, wherein the width of the engaging groove is smaller than the outer diameter of the set screw.

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