JPH0714863Y2 - Chamber door opening / closing mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an opening / closing mechanism of a door rotatably attached to a chamber portion of a thermostatic chamber, a thermo-hygrostat, a thermal shock test device, and various other devices. In particular, a fixed lock pin provided in the chamber portion, rotatably attached to the door in correspondence with the pin, is constantly biased to a closed position by a spring, and is locked by the closing operation of the door. A latch that is pressed against the pin and moved to the open position and then returns to the closed position again to engage with the pin, and rotatably provided on the door so that the latch is disengaged from the pin by the opening operation. The present invention relates to a type of door opening / closing mechanism having a handle for rotating.

[Conventional technology]

A typical example of this type of conventional door opening / closing mechanism is shown in FIG.

That is, the opening / closing mechanism is rotatably provided by a fixed lock pin 31 provided in the chamber portion as shown by numeral 1 in FIG. 1 and a bearing portion not shown in the door as shown by numeral 2 in FIG. A first shaft rod 32 and a latch 33 attached to the shaft rod. Further, a second shaft rod 30 rotatably supported on the door by a bearing portion (not shown) and a handle 36 attached to the shaft rod are provided. The shaft rods 32 and 30 are integrally formed. When the latch 33 opens in the direction A in the figure, the handle 36 also opens in the direction A, and when the latch 33 closes in the direction B, the handle 36 moves in the direction B. It closes and the handle A
When the opening operation is performed in the direction A, the latch also opens in the direction A.

The latch 33 is constantly biased in the B direction by the torsion coil spring 34. The coil portion of the spring 34 is fitted to the shaft rod 32, the straight portion 342 in the middle of the spring is in contact with the back portion of the latch 33, and the spring free ends 341 and 343 are supported by the part 21 of the door. The rotation of the latch 33 in the B direction is restricted by the protrusion 333 provided on the rear portion of the latch coming into contact with the part 22 of the door.

The closed position where the latch protrusion 333 contacts the part 22 of the door is just the position where the latch recess 332 engages with the lock pin 31.

In the state shown in FIG. 4, the door is closed and the latch 33 is engaged with the pin 31, but when the handle 36 is turned in the A direction, the shaft 3
0 and 32 rotate in the same direction, the latch 33 opens and the pin 31
You can open it and open the door.

When the door is closed from the state where the door is open, the latch 33 is pushed relatively to the pin 31 while the tip inclined surface 331 of the latch 33 is in contact with the pin 31, and opens in the direction A, and then closes in the direction B again. Then, the recess 332 engages with the pin 31.

[Problems to be solved by the invention]

However, in such a conventional opening / closing mechanism, since the opening operation in the direction A by the pin 31 of the latch 33 at the time of closing the door is transmitted to the handle 36, when the door is vigorously pushed toward the chamber portion to close the door, The latch 33 vigorously abuts on the lock pin 31 of the chamber portion, opens once and then immediately closes again to engage with the pin, and in conjunction with this, the handle 36
Also shocks back and forth.

Therefore, when the door is closed while holding the handle 36, the movement of the handle causes a feeling of strangeness and the operability is poor. Moreover, in some cases, such a violent movement of the handle may cause the hand to be injured and injured. There is also a problem that the design of the handle shape or the like is limited in order to reduce such a possibility. Further, when the handle 36 dislikes such movement and tries to close the door by pushing the other part of the door, there is a problem that the latch does not work well and it is difficult to securely close the door.

Therefore, an object of the present invention is to provide a chamber door opening / closing mechanism which is simple and inexpensive and improved so that the operation of the latch by the fixed lock pin when the door is closed is not transmitted to the handle.

[Means for solving problems]

According to the above object, the present invention is a door opening / closing mechanism rotatably attached to a chamber part. The lock lock pin is provided on the chamber part, and rotatably attached to the door in correspondence with the pin. , Being constantly biased by a spring to a closed position for engaging the lock pin and being pressed against the lock pin as the door closes, the lock pin is engaged against the spring force. A latch that is pivoted to the open position and then returned to the closed position to pivot and engage with the pin, a handle that is rotatably operable on the door, and a clutch that connects the latch and the handle. The clutch has a first member connected to the latch so as to be rotatable in conjunction with the latch, and a second member connected to the handle so as to be rotatable in association with the handle. Including and The first and second members are idle and rotated with respect to the second member in association with the reciprocating rotation of the latch accompanying the closing operation of the door, and the second member is the door handle. And a meshing tooth portion for rotating the first member so as to engage with the first member and rotate the latch from the closed position to the open position by rotation by operation. And a chamber door opening / closing mechanism for operating the same.

The connection between the first member and the latch in the clutch and the connection between the second member of the clutch and the door handle may be directly connected to each other, or to a rotatable shaft rod that supports the latch. It may be an indirect connection mode such that the first member is connected or the second member is connected to a rotatable shaft rod that supports the handle.

In the case of the direct connection, for example, the latch, the clutch, and the handle may be fitted to one shaft rod, and the latch, the clutch, and the handle may be rotatable with respect to the shaft rod.

[Action]

According to the door opening / closing mechanism of the present invention, even if the latch is pushed relative to the fixed lock pin of the chamber when the door is closed and the opening operation is performed, the operation is not transmitted to the handle due to the action of the clutch, and accordingly, the handle is closed. Does not move. Further, even when the latch is pushed by the pin and opened, and then closed by the spring force so as to engage with the pin, the clutch only returns to the initial state and the latch closing action is not transmitted to the handle. . Other operations of each part associated with the door opening / closing operation are the same as those in the conventional mechanism.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3.

FIG. 1 shows an example of an incubator to which a door opening / closing mechanism 3 according to an embodiment is applied, which is provided with a door 2 rotatably connected to a chamber portion 1 having a test chamber by a hinge 20.

Details of the mechanism 3 are as shown in FIG.

The mechanism shown in FIG. 2 has a first shaft rod 32 that supports a latch 33.
And the second shaft rod 35 that supports the handle 36 are not integrally formed, and they are connected via the clutch 4. The remainder is the same as the conventional mechanism shown in FIG. The shaft 35 is rotatably supported on the door 2 by a bearing portion (not shown).

The clutch 4 is a first member 41 fixed to the first shaft rod 32.
And a second member 42 fixed to the second shaft rod 35. The connecting pin 43 is rotatably fitted to both of these members 41 and 42, and both members are relatively rotatable.

The members 41 and 42 have meshing tooth portions 411 and 412, respectively, which project in the longitudinal direction of the shaft rod, and are configured to mesh with each other.

In this embodiment, as shown in FIG. 3, the meshing tooth portion 411 on the member 41 side is semicircular, and the meshing tooth portion 421 on the member 42 side is 1/3 circular (fan shape) with a scissor angle of 120 °. The mutual abutment of the meshing tooth portions 411 and 421 allows the mutual rotational movements to be transmitted.

That is, a play with a rotation angle of 60 ° is generated due to the configuration of the angle between the meshing tooth portions 411 and 421, and within this play angle, the rotational motions are not transmitted to each other, but the play occurs.

When the door 2 is closed and the latch 33 is engaged with the fixed lock pin 31, or when the door 2 is open, the tooth surface 411a of the meshing tooth portion 411 and the meshing tooth portion shown in FIG. Four
The tooth surfaces 421a of 21 are in contact with each other, and there is a play angle of 60 ° between the tooth surface 411b of the tooth portion 411 and the tooth surface 421b of the tooth portion 421.

Now, when the handle 36 is rotated in the direction A while the door 2 is closed, the member 41 is rotated by the rotational movement of the member 42.
When the latch 33 is rotated in the same direction, the latch 33 is similarly rotated in the A direction to disengage from the fixed lock pin 31, and the door 2 can be opened.

On the contrary, when the door 2 is pivoted from the opened state to be closed, the latch 33 pivots in the A direction against the spring 34 due to the contact of the inclined surface 331 with the fixed lock pin 31, so that Axis rod
32 and the member 41 of the clutch 4 also rotate in the A direction in the same manner, but there is a play angle resulting from the difference in the pinching angle of the meshing tooth portions 411 and 421 of the members 41 and 42. Then, the rotation of the member 41 is not transmitted to the member 42, and therefore the handle 36 does not move. That is, when the door 2 is closed, the latch 36 rotates with the fixed lock pin 33 while the handle 36 does not move, and then returns and rotates with the force of the spring 34 to engage with the pin 31.

In this way, since the handle 36 does not move when the door 2 is closed, there is no discomfort even if the door 36 is closed by holding the handle 36.
The operability is good, and the door 2 can be closed easily and surely.

Further, when the door 2 is opened, the handle 36 can be easily opened by the opening operation as in the conventional case.

The present invention is not limited to the above embodiment,
Besides, it can be implemented in various modes.

For example, the latch 33 and the clutch 4 are provided on the upper and lower sides in the above embodiment, but only one of them may be provided. Also,
In the above embodiment, the connecting pin 43 of the clutch 4 is rotatable with respect to both the members 41 and 42, but it may be rotatable with respect to only one of them. The present invention also includes a mode in which the latch 33 is directly connected to the clutch member 41 and the handle 36 is directly connected to the clutch member 42, and one axle is rotatably passed through the latch, the clutch and the handle. Be done. Furthermore, the spring that imparts the biasing force to the latch is not limited to the spring described above, and may be a spring having another aspect.

[Effect of device]

According to the present invention, the operation of the latch by the fixed lock pin at the time of closing the door is not transmitted to the handle, so that there is no discomfort when the door is closed by holding the handle, the operability is good, and the door can be easily and reliably closed. As in the prior art, there is no risk of injury due to the handle moving violently when the door is closed, and the design of the handle shape and the like is free, and a chamber door opening / closing mechanism with a simple structure and low cost can be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an example of an incubator to which an embodiment of the present invention is applied, FIG. 2 is a perspective view of the embodiment, FIG. 3 is an explanatory view of a tooth portion of a clutch, and FIG. 4 is a conventional example. FIG. 1 ... Chamber part, 2 ... Door, 3 ... Door opening / closing mechanism, 31 ... Fixed lock pin, 32 ... First shaft rod, 33 ... Latch, 34 ... Spring, 35 ... Second Shaft rod, 36 ... Handle 4 ... Clutch 41 ... First member of clutch 4 411 ... Tooth portion 411a, 411b of member 41 ... Tooth surface 42 of tooth portion 411 ... Second member of clutch 4 421 ... ... Tooth portion 421a, 421b of member 42 ... Tooth surface of tooth portion 421

Claims (1)

[Scope of utility model registration request] 1. A door opening / closing mechanism rotatably attached to a chamber part, wherein a fixed lock pin provided in the chamber part and a rotatably attached to the door in correspondence with the pin, A biasing force is applied to a closed position for engaging the lock pin by a spring, and the spring pin is pressed against the lock pin with the closing operation of the door so that the lock pin is not engaged against the spring force. A latch that is pivoted to the open position and then returned to the closed position and pivoted to engage the pin, a handle that is rotatably provided on the door, and a clutch that connects the latch and the handle. The clutch includes a first member connected to the latch so as to be rotatable in conjunction with the latch, and a second member connected to the handle so as to be rotatable in association with the handle. Including the first and The second member is idle and rotated with respect to the second member in association with the reciprocating rotation of the latch accompanying the closing operation of the door, and the second member is rotated by the door handle operation. Chamber door opening / closing mechanism having engaging teeth for rotating the first member so as to rotate the first member so as to rotate the latch from the closed position to the open position by engaging with the first member. .