JPH0350224Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Purpose of the invention (industrial application field) This invention is a box lock used on a door, especially a latch bolt that operates with the rotation of a door knob when releasing the latch bolt. This invention relates to a drive cam device.

(Prior Art and Problems to be Solved) Conventionally, in order to release the latch bolt of a box lock, a driving cam is engaged with a sliding rod integrated with the latch bolt that is elastically biased in the locking direction, that is, in the projecting direction. A square shaft provided integrally with an external knob is inserted into a square hole provided in the cam, and the square shaft is rotated by rotation of the knob, and by rotation of a drive cam that engages with the square shaft. Therefore, devices in which the sliding rod and latch bolt are configured to be retracted are widely used.

However, with this configuration, in order to easily engage the square shaft on the knob side with the square hole of the drive cam at the construction site, the cross-sectional shape of the square shaft is configured to be considerably smaller than the square hole. It was normal to have one.

For this reason, when the knob is rotated, the play between the square shaft and the square hole inevitably causes play in the rotation operation of the knob, and noise is generated. As a result, the square shaft side, especially the corner part, was worn out and the operation of the latch bolt inevitably became unstable.

The present invention was devised to deal with this situation, and includes a washer made of resin attached to the square hole on the drive cam side that is connected to the square shaft on the knob side, and a washer formed on the washer. To provide a latch bolt drive cam device which hardly causes the above-mentioned defects and operates stably over a long period of time by fitting a square shaft into a square hole without play. The purpose is to

(2) Structure of the invention (technical means for solving the problem and its function) In order to achieve the above-mentioned purpose, the invention consists of a latch bolt that is always elastically biased in the locking direction, and a sliding bolt provided integrally with the latch bolt. A latch bolt drive cam that has a rotatable drive cam that engages with a moving rod, and a square shaft that engages with a square hole formed in the drive cam and rotates the drive cam by rotating a knob. In the device, a resin washer is disposed at a position aligned with the square hole of the drive cam, the resin washer having a square hole having a shape smaller than the cross-sectional shape of the square shaft and capable of press-fitting the square shaft. It is something that is characterized by something.

With this configuration, play during operation of the knob and generation of noise during operation can be effectively prevented.

(Description of an embodiment) Fig. 1 is a partially cutaway side view showing the configuration of the main parts of a box lock, and in the case shown, a latch bolt 2 protrudes from one end face of a box lock A. A sliding rod 5 is attached to the inner end of the box lock 2.
A coil spring 4 is fitted into the sliding rod 5, and one end 4' of the coil spring 4 is connected to the latch bolt 2.
The rear end and the other end 4'' abut against a fixing piece 6 protruding from the inner surface of the case 3 of the box lock, thereby biasing the latch bolt 2 to the locking position shown.

As shown in the figure, the sliding rod 5 extends beyond the fixed piece 6 to the right in the figure, and has a fixed piece 7 disposed at its end.

Projections 8'a and 8'b formed on a drive cam 8, which will be described later, are engaged between the fixing piece 6 and the fixing piece 7.

In addition, the square hole 9 formed in the drive cam 8 has a
A square shaft 10 attached to an external knob (not shown) is engaged, so that by rotating the knob, the drive cam 8 is moved via the square shaft 10 to the spring 4.
When rotated clockwise in Figure 1 against the action of
The sliding rod 5 is displaced to the right in the figure, and the latch bolt 2 is moved to the unlocked position.

To explain the drive cam 8, as shown in FIG. ing.

Each cam body 8a, 8b has a protrusion 8'a.
and 8'b are formed, and these protrusions are
As mentioned above, it engages with the fixed piece 7 of the sliding rod 5 and displaces it.

Each of the cam bodies 8a and 8b has a protrusion 12.
and small hole 13 and protrusion 14 and small hole 15
is formed, and the protrusion 12 is connected to the small hole 15.
The protrusions 14 are respectively fitted into the small holes 13 to assemble both cam bodies 8a and 8b,
The fitting state between these protrusions and small holes shall be maintained firmly.

At this time, when the coil spring 11 is wound around the cylindrical body 8''a and the drive cam 8 is mounted at a predetermined position,
When one end 11b of the spring 11 is locked in a proper position in the case and the other end 11a is locked in the protrusion 16 formed on the cam body 8a and the knob is released, this spring 11 in addition to the spring 4 is locked. By this action, the drive cam 8 reliably returns to the position shown in FIG.

As can be seen from FIGS. 2, 8, and 10, a recess 18 is formed inside the cam body 8b, and the recess is made of a suitable resin,
A washer 17 formed with a washer 7' is attached, and as described above, when the cam bodies 8a and 8b are integrally combined, the square hole 9 and the washer's square hole 17' are arranged so that the positions are aligned. At the same time, the washer 17 is strongly pressed and held by both cam bodies.

When the square shaft 10 is inserted into the drive cam 8, the square shaft also passes through the square hole 17' of the washer 17, but this square hole 17' is formed smaller than the square hole 9. When a square shaft passes through this square hole 17', the size of the square hole 17' is set to such an extent that the square shaft 10 is press-fitted into the square hole 17'.

By configuring in this way, the square shaft 10
Even if it is formed in a cross-sectional shape that has some looseness with respect to the square hole 9, it is configured so that there is no gap with respect to the square hole 17' of the resin washer 17. As a result, the rotation operation of the knob is immediately and reliably converted into the rotation of the drive cam, and there is no noise caused by irregular contact between the square shaft and the inner surface of the square hole, and the two washers are Since it can be firmly held by the cam body, it will not be displaced unnecessarily by torque from the square shaft side, and can withstand wear and tear and perform stable operation over a long period of time.

(3) Effects of the invention As explained above, according to the invention, in a lock configured to rotate the drive cam inside the lock and release the latch bolt by rotating the knob, the knob side This ensures that play in the operation of the knob due to the gap between the square shaft and the square hole on the drive cam side, as well as noise caused by irregular contact between the square shaft and the inner surface of the square hole, is prevented, making the knob stable at all times. You can perform a release operation using

[Brief explanation of drawings]

Fig. 1 is a side view of the box lock with a part cut away, Fig. 2 is a side view of the drive cam, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is a front view of one cam body. , FIG. 5 is a rear view of the same as above, FIG. 6 is a sectional view of same as above with the corner shaft removed, FIG. 7 is a plan view of same as above, FIG. 8 is a front view of the other cam body, and FIG. 9 is a rear view of same as above. , FIG. 10 is a sectional view of the same with the corner shaft removed, FIG. 11 is a plan view of the same, and FIG. 12 is a front view of the washer. 2...Latch bolt, 4...Coil spring, 5...
...Sliding rod, 8... Drive cam, 8a, 8b... Cam body, 11... Coil spring, 17... Washer.

Claims (1)

[Scope of Claim for Utility Model Registration] A latch bolt that is always elastically biased in the locking direction, a rotatable drive cam that engages with a sliding rod provided integrally with the latch bolt, and a corner formed on the drive cam. In a latch bolt drive cam device having a square shaft that engages with a hole and rotates a drive cam by rotating a knob, the square shaft can be press-fitted into a position aligned with the square hole of the drive cam. A latch bolt drive cam device for a box lock, which is provided with a resin washer having a square hole with a shape smaller than the cross-sectional shape of the square shaft.