JPH0664444A - Connecting member - Google Patents

Abstract

PURPOSE:To widen the field of view of a cabin as well as to enable a window to be smoothly opened/closed. CONSTITUTION:The connecting member 1 is made up of a roller 3 provided for the lower end of a window W while being guided by a guide rail, a fixed member 2 provided coaxially with the roller 3 while being connected to a part of the window W, a mounting bracket 4 rotatably and pivotally supported by the fixed member 2, a support roller rotatably attached to the mounting bracket 4, and of a locking member 5 fixed onto the mounting bracket 4 while being connected to a part of a cable 22.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a connecting member. More specifically, the present invention relates to a connecting member for a window and a control cable (hereinafter, simply referred to as a cable), which is provided as a part of an opening / closing device for a front window of a cabin of a construction machine or the like.

[0002]

2. Description of the Related Art Recently, in construction machines such as power shovels, a front window is openable in order to avoid an increase in temperature in a cabin in the summer. Since the window is usually heavy, it is difficult to open and close it manually.

Therefore, the present inventors have proposed an opening / closing device capable of automatically opening / closing a window (Japanese Patent Application No. 4-18211). FIG. 6 shows a power shovel as an example of a construction machine to which the opening / closing device is applied. The front surface 81 of the cabin 80 and the ceiling 82 are formed by the side surfaces of partial cylinders in which curved surfaces having different curvatures are continuous, and the window W also formed by the curved surface is attached to the window frame F of the front surface 81. This window W is, as shown in FIG.
The inner surface of the cabin 80 can be moved along the curved surface of the cabin 80 between the fully open position (storage position) II indicated by a two-dot chain line.

The opening / closing device 31 pushes / pulls the cable 33 by the driving force of the driving device 32, and opens / closes the window W connected to one end of the cable 33 via the connecting member 34 along the guide rail 35. It is what makes me.

The connecting member 34 used here is shown in FIG.
As shown in FIG. 3, it is composed of an L-shaped bracket 37, a cylindrical locking member 38, a bearing 39, a cylindrical rubber damper 40, and a roller 41.

One end of the bracket 37 is fixed to the vicinity of the lower end of the window W with screws via a disc spring or the like. A locking member 38 is attached to the other end of the bracket 37. A roller 41 is rotatably attached to the locking member 38 and is guided by a guide rail 35. A cable attachment portion 42 for connecting to the cable 33 is provided at the tip of the locking member 38. This cable mount 42
Is inserted in the cavity 44 of the cable guide 43 formed by stacking two plate members.

[0007]

Since the connecting member 34 uses the body portion of the locking member 38 as the rotating shaft of the roller 41, the cable attaching portion 42 is provided on the extension line of the rotating shaft of the roller 41. It has a different structure. And the guide rail 35
Has a shape in which the cable guide 43 is further provided on the outer side of the track portion on which the roller 41 rolls, so that the width is considerably wide in the left-right direction of the cabin 80. Therefore, as shown in FIG. 5, when the user gets in the cabin 80, the front view is limited by the guide rails 35 on both sides. Therefore, it becomes difficult to visually check the front of the cabin 80, which is not preferable in terms of work.

The present invention has been made in order to solve the above problem, and an object of the present invention is to provide a connecting member capable of expanding the field of view of the cabin and smoothly opening and closing the window.

[0009]

The connecting member of the present invention is a cabin of a construction machine or the like, which is provided with a window frame on its front surface and which is substantially curved from the front surface to the ceiling,
A connecting member for connecting a window that can be opened and closed along a guide rail extending between the front surface of the cabin and the ceiling and a control cable for opening and closing the window, A fixing member fixed to both sides near the lower end, a roller rotatably provided on the tip side of the fixing member, a bracket rotatably provided on the base side of the fixing member, and the control cable fixed to the bracket A locking member for locking the
The support roller is separated from the roller and rotatably supported by the bracket, and the roller and the support roller are configured to roll together in the guide rail.

[0010]

According to the present invention, since the roller and the locking member are arranged offset in the front-rear direction of the cabin, the cable guide can be provided on the side surface of the guide rail on the rear side of the cabin. Therefore, the width of the guide rail in the left-right direction of the cabin is very narrow, and the width of the window can be widened.

Further, since the connecting member is supported at two points on the guide rail by the roller and the auxiliary roller, the mounting bracket does not rotate to twist the cable. Therefore, a smooth window opening / closing operation can be performed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a connecting member of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of a connecting member of the present invention, FIG. 2 is a partially cutaway front view of the connecting member of FIG. 1, and FIG.
FIG. 2 is an explanatory view showing a state in which a window is attached to the cabin using the connecting member of FIG.

As shown in FIGS. 1 and 2, the connecting member 1 of the present invention is provided at both left and right ends near the lower end of the window W, like the conventional connecting member 34. Since the left and right connecting members 1 have the same configuration except that they are symmetrical, only one connecting member 1 will be described below. Here, 21 is a guide rail for guiding the window W via the connecting member 1, 22 is a cable for pushing and pulling the window W, and 23 is a cable guide for guiding the cable 22.

The connecting member 1 comprises a solid round bar fixing member 2 and
It is composed of a roller 3, a mounting bracket 4, a locking member 5, and a support roller 6.

The fixing member 2 is fixed near the lower end of the window W. A roller 3 is rotatably supported on the fixed member 2. The roller 3 has a rubber damper 3 on its inner surface.
It has a and is arranged so that it can roll inside the guide rail 21. The mounting bracket 4 is rotatably supported on the fixed member 2 by a mounting boss 7 provided on the surface. Further, a locking member 5 is fixed to the mounting bracket 4 at a position separated from a pivot point of the fixed member 2.

A substantially cylindrical cable attachment portion 8 for connecting to the cable 22 is provided at the tip of the locking member 5. A cable 22 is firmly engaged with the cable attachment portion 8 by a cap 24 crimped at the tip.
The cable 22 and the cable mounting portion 8 are inserted into the cavity 25 of the cable guide 23.

A shaft 9 is fixed to the mounting bracket 4 at a position separated from the fixing member 2 and the locking member 5, respectively. The arrangement is such that these three parties 2, 5, 9 form the vertices of a triangle. A support roller 6 is rotatably supported on the shaft 9.

As described above, since the locking member 5 is supported at two points in the guide rail 21 by the support roller 6 and the roller 3, the cable 22 is always tangential to the window W of the cable mounting portion 8 at that portion. Will be attracted to.
Therefore, since the cable 22 is not bent, the service life is not shortened.

The distance H between the roller 3 and the support roller 6 is set so that the connecting member 1 can smoothly move along the guide rail 21. Since the front surface 81 of the cabin and the guide rail 21 have a shape in which a plurality of curves having different curvatures are continuous, if the space H is set too wide, the roller 3 or the support roller 6 will be caught inside the guide rail 21 and connected. The member 1 cannot move smoothly along the guide rail 21. On the contrary, if it is made too narrow, the support roller 6 does not serve as a rotation stopper for the mounting bracket 4. In consideration of the above matters, the distance H between the roller 3 and the support roller 6 is preferably set in the range of 30 to 50 mm.

A preferred example of the guide rail 21 and the cable guide 23 corresponding to the connecting member 1 configured as described above will be described below.

As shown in FIG. 1, a guide rail 21 having a U-shaped cross section and a cable guide 23 having a C-shaped cross section are integrally formed from a thin metal plate on the front side in the front-rear direction of the cabin. ing. The narrow portion 26 of the cable guide 23
Is set so that the locking member 5 can slide smoothly.

As described above, by using the connecting member 1 of the present invention having a narrow width in the left-right direction of the cabin, the width of the window W can be made wider than in the conventional case (see FIG. 3). Therefore, the field of view in front of the cabin is greatly expanded, so that the user can easily see the cabin 80 in front.

Using the connecting member 1 of the present invention, the window W
When the cable 22 is moved along the guide rail 21, as shown in FIG. 2, first, when the cable 22 is pulled in the direction of arrow A, the mounting bracket 4 is pulled via the locking member 5. At this time, a moment in the direction of arrow B acts on the mounting bracket 4 with the fixing member 2 as the center of rotation, but the support roller 6 contacts the guide rail 21 to prevent the mounting bracket 4 from rotating. Therefore, the cable W is not bent or twisted, so that the durability is not deteriorated. Moreover, the tension acting on the mounting bracket 4 is efficiently transmitted to the window W via the fixing member 2, and as a result, the window W can be smoothly opened and closed.

[0025]

By using the connecting member of the present invention,
The view of the cabin is greatly expanded. Therefore, the user can drive the construction machine under suitable operating conditions.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a connecting member of the present invention.

2 is a partially cutaway front view of the connecting member of FIG. 1. FIG.

FIG. 3 is an explanatory view showing a state in which a window is attached to the cabin using the connecting member of FIG.

FIG. 4 is a cross-sectional view showing an example of a conventional connecting member.

FIG. 5 is an explanatory view showing a state in which a window is attached to a cabin using a conventional connecting member.

FIG. 6 is a perspective view showing an example of a power shovel including a curved cabin to which the opening / closing device is applied.

FIG. 7 is a perspective view showing an example of an opening / closing device.

[Explanation of symbols]

 1 Connecting Member 2 Fixing Member 3 Roller 4 Mounting Bracket 5 Locking Member 6 Support Roller 21 Guide Rail 22 Cable W Window

Claims (1)

[Claims] 1. A cabin of a construction machine or the like having a window frame on its front surface and having a substantially curved surface from the front surface to the ceiling, along a guide rail extending between the front surface and the ceiling of the cabin. With a window that can be opened and closed,
A connecting member for connecting a control cable for opening and closing the window, the fixing member fixed to both sides near the lower end of the window, and a roller rotatably provided on the tip side of the fixing member. A bracket rotatably provided on the base side of the fixing member; a locking member fixed to the bracket for locking the control cable; and a bracket rotatably supported by the bracket apart from the roller. And a support roller which is configured to roll together in the guide rail.