JPS5942464Y2 - door opener - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an opening/closing device applied to, for example, a cabin door of an agricultural tractor.

For example, doors of cabins and the like are required to be provided with a stay damper in order to lighten the opening/closing operation, and to be configured to maintain the door in the closed and open states.

The object of the present invention is to provide a door opening/closing device that can meet such requirements by the arrangement of the pivot points of the door and the damper, and the action of the lock arm that keeps the door open. includes a frame, a door connected to the frame via a pivot, a lock arm whose end is pivoted to a bracket fixed to the frame, and a door with one end pivoted to the tip of the lock arm. a damper whose other end is pivotally supported, and a lock arm positioned so that when the door is closed, the door side pivot point of the damper is located on the frame side beyond the closing center line connecting the pivot body and the damper's one end pivot point. and a first stopper that defines a first stopper that rotates the lock arm when the door is kept open so that one end pivot point of the damper is positioned on the frame side beyond the center line connecting the door side pivot point of the damper and the lock arm pivot point. and a second stopper for regulating the position of the lock arm when the lock arm is in the locked state.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an agricultural tractor 1 to which the present invention can be applied, 2 is a fuselage, 3 is a cabin attached to the fuselage 2, 4 is a frame of the cabin 3, and 5 is a door 6 showing a side window. The opening/closing device 11 is provided between the frame 4 and the door 5.

Based on the embodiment of the present invention shown in FIGS. 2 to 5, 12
is a front frame which is the front part of the frame 4 of the cabin 3; the door 5 is rotatably supported at one end of this front frame via a pivot member 13 such as a hinge; From the closed position (solid line position in Figure 2) that is substantially perpendicular to the open position (position shown in imaginary line in Figure 2) in which it abuts the stopper 14 1
It can rotate approximately 180°.

A grip part 15 and a bracket 17 are provided on the inner surface of the door 5, and the tip of the telescopic rod 19 of the stay damper 18 is pivotally connected to the bracket 17 via a pin 20, and the end of the telescopic rod 19 of the stay damper 18 is pivotally connected to the bracket 17, and the end of the telescopic rod 19 of the stay damper 18 is pivotally connected to the bracket 17. It forms a pivot point A.

A bracket 22 is fixed to the inner surface of the front frame 12, and the end of a lock arm 25 is pivotally connected to this bracket 22 via a pin 23, forming a pivot point B of the lock arm 25. .

A pivot point C at one end of the damper 18 is formed at the tip of the lock arm 25 to which the end of the cylinder 2T of the damper 18 is pivotally connected via a pin 26.

The stay damper 18 has a telescopic rod 19 inside the cylindrical cylinder 27.
The telescopic rod 19 is elastically protruded by arranging one end of the rod and a spring 28.

30 is a handle welded to the lock arm 25;
This serves as a gripping portion when rotating the lock arm 25 against the elastic force of the damper 18.

The rotation of the lock arm 250 is regulated by a first stopper 31 provided on the bracket 22 and a front frame 12 (second stopper). The second stopper may be protruded.

The first stopper 31 has a door-side pivot point A located on the front frame side with respect to a closing center line F connecting the pivot point and one end pivot point C of the damper 18 when the door is closed, and a door-side pivot point when the door is opened. A restricts the position of the lock arm 25 relative to the bracket 22 so that it passes through the closing center line F.

The second stopper (front frame 12) rotates the lock arm 25 when the door is kept open so that the pivot point C at one end of the damper 18 is aligned with the center line G connecting the pivot point A on the door side and the pivot point B of the lock arm 25. The position of the lock arm 25 is regulated so that it is positioned on the front frame side beyond the front frame.

The lock arm 25 rotates at a position 1 where one end of the pivot point C crosses the center line H connecting the pivot points B and D, and even if the door 5 is closed in this state, the door side pivot point A does not cross the center line F. It is preferable to set the value so that the value is never exceeded.

In addition, the contact surface between the door 5 and the center line F is 90' when the door is opened.
It is preferable to set it to be larger than 90', and to be smaller than 90' when the lock arm 25 is operated and kept open.

FIG. 2 shows the door closed, the door 5 being substantially orthogonal to the front frame 12, and the lock arm 25 abutting the first stopper 31 to prevent counterclockwise rotation. There is.

The door-side pivot point A of the damper 18 is located closer to the front frame 12 than the closing center line F that connects the pivot point for door rotation formed by the pivot body 13 and the pivot point C at one end of the damper 18. be.

That is, when the open door 5 is closed, the pivot point A
moves forward beyond the center line F, and therefore the tensile force of the damper 18 acts in the direction of closing the door 5, preventing the door 5 from opening naturally and maintaining the closed state.

3 and 4 show the door in the open state, and when the door 5 is rotated clockwise from the closed state in FIG. Damper 18
It can be opened lightly by applying a stretching force of about 180 mm.
It rotates by ° and comes into contact with the stopper 14.

Since the elastic force of the damper 18 is a residual force, natural closing of the door 5 is prevented, and the door 5 is closed by an artificial force greater than the elastic force.

The open state shown in FIG. 3 is a state in which the door 5 can be closed by rotating counterclockwise, and the lock arm 25 is provided to maintain this open state.

That is, as shown in FIG. 3, the lock arm 25 is rotated clockwise to come into contact with the front frame 12 serving as a second stopper.

As the lock arm 25 rotates about the pivot point B, the pivot point C of the damper 18 moves beyond the center line G connecting the pivot points A and B to the front frame 12 side.

By operating the lock arm 25 as shown in FIG. 5 and moving the pivot point C at one end beyond the center line G, more preferably, the center line H, the damper 18 is slightly reduced and the extension force is increased. The door 5 becomes more difficult to close than the open state shown in FIG. , even if the door 5 is closed, its state is not maintained; therefore, the open state is completely maintained.

When it is desired to close the door 5 from the open state, the lock arm 25 is rotated counterclockwise to release the lock, and then the door 5 is rotated counterclockwise.

According to the present invention described in detail above, by operating the lock arm, a door that can be opened and closed can be maintained in an open state. make it easier to

[Brief explanation of drawings]

FIG. 1 is a side view of a tractor with a cabin to which the present invention can be applied, and FIGS. 2 to 5 show embodiments of the present invention.
FIG. 2 is a cross-sectional plan view showing the door in the closed state, FIGS. 3 and 4 are a cross-sectional plan view and rear explanatory view showing the door in the open state, respectively, and FIG. 5 is a cross-sectional plan view showing the door in the open state. . 1...Tractor, 3...Cabin 5
...Door 11...Opening/closing device, 12...
...Front frame, 13...Pivot, 17, 22...Bracket, 18...
・Stay damper, 20, 23, 26...pin 2
5... Lock arm, 30... Handle, 31... First stopper, A, B, C, D.
...Pivotal point, F, G... Center line.

Claims (1)

[Scope of utility model registration request] a frame; a door connected to the frame via a pivot; a lock arm having an end pivoted to a bracket fixed to the frame; one end pivoted to the tip of the lock arm and the other end pivoted to the door; A damper whose end is pivotally supported, and a lock arm whose position is defined so that when the door is closed, the door-side pivot point of the damper is located on the frame side beyond a closing center line connecting the pivot body and one end pivot point of the damper. a state in which the lock arm is rotated when the door is kept open, and the pivot point at one end of the damper is positioned on the frame side beyond the center line connecting the door-side pivot point of the damper and the pivot point of the lock arm; A door opening/closing device comprising a second stopper for regulating the position of the lock arm.