JP7251805B2 - Lock switching mechanism for rotary operation handle - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock switching mechanism for a rotary operating handle in a working machine such as a concrete cutter for cutting or cutting asphalt paved surfaces or concrete surfaces of roads.

Among various work machines, there are those equipped with a rotary operating handle. For example, many concrete cutters for cutting or cutting asphalt paved surfaces or concrete surfaces of roads are equipped with a rotary operation handle (elevating handle) as an operating means for adjusting the depth of the blade.

Specifically, as shown in FIG. 6, a general concrete cutter has a body frame 72 supported by wheels (front wheels 73 and rear wheels 76) and a blade 71 attached to the front portion of the body frame 72. It is supported laterally and receives driving force from a prime mover (not shown) such as an engine mounted on the body frame 72 to rotate at high speed.

A front wheel 73 is supported at the tip of a support arm 74 . The support arm 74 is connected to a rotary operating handle (elevating handle) (not shown) through a link 75. By rotating the rotary operating handle, the support arm 74 is rotated by a predetermined angle around the horizontal axis passing through the pivot point P. It can be rotated within a range. 6(1) to 6(2). The height of the front side of 72 and the depth of blade 71 can be freely adjusted.

JP 2017-43941 A JP 2012-162939 A

When performing cutting work with a concrete cutter, the depth of the blade 71 is adjusted by rotating the rotary operation handle (elevating handle) while the blade 71 is rotated at high speed. The lock mechanism (not shown) was manually operated to prevent the operation handle from rotating, and the concrete cutter was moved forward along the planned line. In this case, the vibration of the aircraft itself or external impact may cause the rotary operation handle to rotate (malfunction), and in this case, there is the problem that the depth of the blade 71 deviates from the set value. be.

SUMMARY OF THE INVENTION The present invention is intended to solve such problems in the prior art, and is a rotary operating handle that can be automatically locked or unlocked when not operated to avoid erroneous operation. An object of the present invention is to provide a lock switching mechanism for an operating handle.

A lock switching mechanism for a rotary operating handle according to the present invention engages a handle shaft rotatably supported and a handle stay consisting of a fixed portion and a movable portion to move the handle shaft relative to other elements. and a transmission mechanism for transmitting a force for operating the locking means. and the movable portion is pivotally attached to the protrusion of the fixed portion so as to be rotatable from the extended state to the bent state and biased in the bending direction. The movable portion and the lock means are connected by a transmission mechanism so that the lock means is operated by the rotation of the movable portion.

The lock switching mechanism of this rotary operating handle has a cam mechanism consisting of the end surface of the movable portion and a driven pin as a transmission mechanism for connecting the movable portion and the locking means. and is biased toward the movable portion so that the distal end portion is always pressed against the end surface of the movable portion, and the end surface of the movable portion is formed by the driven pin and the end surface of the movable portion. The distance from the contact point of the movable part to the pivot point of the movable part is formed in a cam shape with a curved surface that gradually decreases from the extended state to the bent state of the movable part, and when the movable part is rotated around the pivot point, the driven pin It is preferable that the driven pin is urged toward the movable portion and pressed against the cam-shaped end surface, so that the movable portion It is preferably biased in the bending direction.

In the concrete cutter according to the present invention, the lock switching mechanism of the rotary operation handle as described above is applied to the lifting handle of the concrete cutter, and the engaging portion that does not rotate together with the handle shaft and the engaging portion that does not rotate together with the handle shaft serve as a pair of locking means. and a lock pin that locks the rotation of the handle shaft by engaging with the portion, and when the movable portion is in the bent state, the lock pin engages with the engaging portion to lock the rotating shaft and the movable portion is locked. It is characterized in that when it is in the extended state, the lock pin is disengaged from the engaging portion and the rotating shaft is in the unlocked state.

This concrete cutter is configured such that the upper end of the handle shaft passes through a through hole formed in the upper cover of the concrete cutter body and protrudes upward from the upper cover, and the engaging portion is located on the upper cover. It is preferable that a plurality of through-holes are formed around the through-hole.

Further, in the concrete cutter according to the present invention, the lock switching mechanism of the rotary operation handle as described above is applied to the traveling handle of the concrete cutter, and the handle shaft and the drive shaft of the rear wheels are connected and disconnected. When the movable part is in the extended state, the locking means are engaged to lock the handle shaft to the drive shaft of the rear wheel, and by rotating the traveling handle When the rear wheels can be driven and the movable portion is in the bent state, the locking means is disengaged and the rear wheels are free to rotate with respect to the handle shaft. Characterized by

The lock switching mechanism for a rotary operating handle according to the present invention does not require manual operation for locking or unlocking the handle shaft with respect to other elements when it is not operated, and the operator can easily remove the hand from the grip or the like. When released, it is automatically locked or unlocked to avoid malfunction.

FIG. 1 is an explanatory diagram of a first embodiment in which a lock switching mechanism for a rotary operating handle according to the present invention is applied to a lifting handle of a concrete cutter, and is a cross-sectional view of the lifting handle 1 (unlocked state); 3 is a perspective view of a lock pin 33 and a driven pin 34; FIG. FIG. 2 is a sectional view of the lifting handle 1 shown in FIG. 1 in a locked state. 3 is a plan view of the engaging portion 61 and the through hole 62 formed in the top cover 6 shown in FIG. 1. FIG. FIG. 4 is an explanatory diagram of a second embodiment of a lock switching mechanism for a rotary operating handle according to the present invention, and is a cross-sectional view of the rotary operating handle (unlocked state). 5 is a cross-sectional view of the rotary operating handle shown in FIG. 4 in a locked state; FIG. FIG. 6 is a diagram showing an example of a blade depth adjustment mechanism in a general concrete cutter.

An embodiment of the "lock switching mechanism for a rotary operating handle" (hereinafter simply referred to as "lock switching mechanism") of the present invention will be described below with reference to the accompanying drawings. FIG. 1(1) is an explanatory view of a first embodiment in which a lock switching mechanism according to the present invention is applied to a lifting handle (rotary operating handle) of a concrete cutter, and is a cross section of the lifting handle 1 (unlocked state). 1(2) is a perspective view of the lock pin 33, and FIG. 1(3) is a perspective view of the driven pin 34. FIG. 2 is a sectional view of the lift handle 1 shown in FIG. 1 in a locked state.

The lifting handle 1 is composed of a handle shaft 2 (rotating shaft), a handle stay (fixed portion 3 and movable portion 4), and a grip 5. As shown in FIG. Of these, the handle shaft 2 is rotatably supported around the central axis A by bearings (not shown).

The upper end of the handle shaft 2 protrudes upward from the upper cover 6 through a through hole 62 formed in the upper cover 6 of the body of the concrete cutter. On the other hand, the lower end (not shown) of the handle shaft 2 supports the front wheel (73) of the concrete cutter, similar to the example shown in FIG. It is connected to an arm (74) via a link (75). By rotating the handle shaft 2 (elevating handle 1), the support arm (74) is rotated to move the body frame (72). The angle of inclination in the longitudinal direction and the depth of the blade (71) can be adjusted.

The handle stay is composed of a fixed portion 3 and a movable portion 4 . Of these, the fixed portion 3 is fixed to the side portion of the upper end portion of the handle shaft 2 , and includes a base end portion 31 extending along the handle shaft 2 (in the vertical direction) and an outer side (handle shaft 2) and a projecting portion 32 extending obliquely upward. On the other hand, the grip 5 is attached to the distal end portion 41 of the movable portion 4, and the pivotal attachment portion 42 is pivotally attached to the distal end portion of the projecting portion 32. The state in which the movable portion 4 extends in the extending direction of the protruding portion 32) to the bent state shown in FIG. ) is configured to be rotatable.

When the movable portion 4 is in the bent state shown in FIG. 2, the lift handle 1 has a lock switching mechanism that engages a pair of lock means to lock the handle shaft 2 to another element (in this embodiment, the top cover). 6), and when the movable portion 4 is in the extended state shown in FIG. Rotation operation becomes possible.

To explain this point in detail, a hollow portion is formed inside the base end portion 31 of the fixing portion 3, and the lock pin 33 is arranged in the hollow portion in the vertical direction (the center axis A of the handle shaft 2). (direction parallel to ). An engaging portion 61 into which the lower end portion 33 d of the lock pin 33 can be inserted and engaged is formed in the upper surface cover 6 below the lock pin 33 . As shown in FIG. 3, there are a plurality of engaging portions 61 (in this embodiment, six at 60° intervals) around the perimeter (outside in the radial direction) of the through hole 62 of the top cover 6 at equal angular intervals. ) is formed. The lock pin 33 and the engaging portion 61 function as a pair of locking means that can lock the handle shaft 2 to the top cover 6 (an element that does not rotate together with the handle shaft 2) by being engaged. A hollow portion is also formed inside the projecting portion 32 of the fixed portion 3 , and a driven pin 34 is arranged in the hollow portion so as to be movable in the longitudinal direction of the projecting portion 32 .

As shown in FIG. 1(2), the lock pin 33 has a lower half portion 33a formed in an elongated prismatic shape, and an upper half portion 33b having a downward tapered surface 33c (a surface inclined with respect to the longitudinal direction of the lock pin 33). ) is formed. As shown in FIG. 1(3), the driven pin 34 is composed of a columnar upper half portion 34a and a columnar lower half portion 34b having a smaller diameter than the upper half portion 34a. As shown in FIG. 1(3), a coil spring 35 is attached to the lower half portion 34b. The driven pin 34 is urged toward the distal end side (the movable portion 4 side) by the coil spring 35, and the distal end portion is always pressed against the pivot portion 42 (end face 42a) of the movable portion 4 and comes into contact. state.

The end surface 42a of the movable portion 4 with which the driven pin 34 contacts has a cam shape as shown in the drawing, and the contact point C between the driven pin 34 and the end surface 42a of the movable portion 4 is connected to the pivot point of the movable portion 4. A curved surface in which the distance to P is the largest in the stretched state shown in FIG. 1(1) and the smallest in the flexed state shown in FIG. It's becoming

Therefore, when the movable portion 4 and the grip 5 are rotated around the pivot point P, the pivot portion 42 (end surface 42a) of the movable portion 4 operates as a cam, and the driven pin 34 functions as a follower following the cam. It operates linearly along the longitudinal direction of the projecting portion 32 (in an oblique direction). More specifically, in the extended state shown in FIG. 1(1), since the distance from the contact point C to the pivot point P is the largest, the driven pin 34 is positioned at the deepest position (the lock pin 33 In the bent state shown in FIG. 2, the distance from the contact point C to the pivot point P is the shortest, so the driven pin 34 is pushed to the shallowest position (near the pivot point P). position).

The driven pin 34 and the lock pin 33 are arranged in such a positional relationship that the lower end of the driven pin 34 is in contact with the tapered surface 33c of the lock pin 33 at an acute angle. operates in an oblique direction, it acts on the tapered surface 33c (more specifically, the lower end of the driven pin 34 slides on the tapered surface 33c, and the lock pin 33 operates as an opposite cam to the direct-acting cam. ), the lock pin 33 moves up and down.

More specifically, in the extended state shown in FIG. 1(1), the driven pin 34 is pushed to the deepest position (position near the lock pin 33), so the tapered surface 33c of the lock pin 33 is formed. As a result, locking pin 33 is held in an upward position within the cavity of proximal end 31, as shown in FIG. 1(1). In the bent state shown in FIG. 2, the driven pin 34 rises to the shallowest position (position closer to the pivot point P), so that the upper portion of the tapered surface 33c of the lock pin 33 and the driven pin 34 are bent. contact so that locking pin 33 is held in a downward position within the cavity of proximal end 31, as shown in FIG.

1(1), the lower end 33d of the lock pin 33 is located above the top cover 6, and when the lock pin 33 is in the bent state shown in FIG. It is shaped and dimensioned to enter and engage.

When the position of the lock pin 33 matches the position of one of the engaging portions 61 (overlapping in the vertical direction), and the movable portion 4 is bent to the bent state shown in FIG. The lower end portion 33d of the lock pin 33 enters and engages with the engaging portion 61, and the handle shaft 2 becomes unrotatable. When the position of the lock pin 33 is shifted from the position of the engaging portion 61 and the movable portion 4 is bent, the lower end portion 33d of the lock pin 33 is inserted into the engaging portion 61 as it is. However, after that, the handle shaft 2 rotates due to the vibration and impact of the machine body (or the operator rotates the handle shaft 2), and the position of the lock pin 33 and the engaging portion 61 in the vicinity thereof is changed. coincide with each other, the engaged state is established and the handle shaft 2 is locked.

2, the operator grasps the grip 5 or the like and rotates the movable portion 4 radially outward to reach the extended state shown in FIG. , the engagement between the lower end portion 33d and the engaging portion 61 is released, and the handle shaft 2 is in the unlocked state. Therefore, the depth of the blade can be adjusted by rotating the handle shaft 2 (elevating handle 1).

As described above, the driven pin 34 is urged toward the movable portion 4 by the coil spring 35 and pressed against the cam-shaped end surface 42a, so that the movable portion 4 bends in the bending direction ((1) in FIG. 1). 2) from the extended posture shown in FIG. 2 toward the flexed posture shown in FIG. Therefore, in the stretched state shown in FIG. 1(1), when the operator releases the grip 5 or the like (when the lifting handle 1 is not operated), the movable part 4 and the grip 5 automatically rotate, , and the handle shaft 2 is locked.

As described above, in this embodiment, the movable portion 4 is biased in the bending direction by the driven pin 34 and the coil spring 35. Alternatively, the movable portion 4 can be biased by a leaf spring or by arranging a coil spring that acts to pull or push the movable portion 4 in the bending direction.

In this embodiment, as shown in FIG. 3, the outer peripheral portion of the through hole 62 of the upper cover 6 through which the handle shaft 2 passes is partially cut radially outward to form a plurality of engaging portions 61. However, elements other than the top cover 6 (elements that do not rotate together with the handle shaft 2) (for example, radially arranged rod members, punching plates, etc.) are arranged around the handle shaft 2 and engaged. Joints can also be formed.

Furthermore, in this embodiment, the lock pin 33 is configured to move in a direction parallel to the central axis A of the handle shaft 2, but the lock pin moves in the radial direction of the rotation plane of the handle stay, It can also be configured to engage with the engaging portion arranged radially outward.

Further, in the present embodiment, the movable portion 4 and the lock means (lock pin 33) form a cam mechanism (the end surface 42a of the pivot portion 42 and the driven pin 34, and the tapered surface 33c of the lock pin 33 and the driven pin 34). By connecting via another transmission mechanism, the locking means operates according to the rotation of the movable part 4, and the locked state and the unlocked state are switched. It is also possible to connect the movable portion 4 and the locking means so that a force for operating the locking means is transmitted.

For example, the movable portion 4 and lock means (not shown) may be connected via a wire driving mechanism as shown in FIGS. 4 and 5 (second embodiment). Specifically, a cylindrical member 8 to which the upper end of the wire 9 is fixed is positioned outside the handle shaft 2 and below the fixing portion 3 so as not to rotate around the handle shaft 2 and vertically. hold it so that it can be moved to Furthermore, the tubular member 8 is biased upward by a spring 82 so that the upper surface 81 of the tubular member 8 is brought into contact with the lower end of the driven pin 34 .

Then, the lower end of the wire 9 is connected to the locking means, and the cylindrical member 8 is moved up and down by rotating the movable part 4, and the wire 9 is pulled or loosened to operate the locking means (locked state). and unlocked states). With this configuration, the lock means can be arranged at a position away from the movable portion 4 . Therefore, it is possible to apply the lock switching mechanism according to the present invention to the traveling handle of a semi-self-propelled concrete cutter.

The semi-self-propelled concrete cutter is equipped with a traveling handle (rotary operating handle) configured so that the handle shaft and the drive shaft that supports the rear wheel can be dynamically connected, and during cutting work, this By rotating the travel handle, the rear wheels are driven to allow the machine body to travel at a low speed. When simply moving the body without cutting work, the body is pushed to run, but if the running handle and the drive shaft of the rear wheels are connected dynamically at this time, the running handle will rotate. , Since a large load is applied to the rotation of the rear wheel, a general semi-self-propelled concrete cutter has a state where the worm gear connected to the lower end of the handle shaft and the drive shaft of the rear wheel are connected (locked state), It is equipped with locking means (not shown) that can be manually switched between a disconnected state (unlocked state) and a manual operation to unlock the traveling handle and the drive shaft of the rear wheels when simply moving the aircraft. can be switched to a state in which the rear wheels rotate freely.

In such a semi-self-propelled concrete cutter, the movable part 4 and the lock means are connected via a wire drive mechanism as shown in FIGS. When the movable portion 4 is configured to automatically switch between the locked state and the unlocked state, more specifically, when the movable portion 4 changes from the extended state shown in FIG. 4 to the bent state shown in FIG. When the cylindrical member 8 rises to the unlocked state, the rear wheel is free to rotate, and conversely, when the movable portion 4 is operated so that the bent state shown in FIG. 5 changes to the extended state shown in FIG. The cylindrical member 8 descends to be in a locked state, the handle shaft 2 is locked to the drive shaft of the rear wheels, and the rear wheels are driven by the rotating operation of the travel handle to allow the body to travel. In this case, the manual switching operation of the locking means as described above becomes unnecessary, and the work can be performed smoothly.

In addition, it is also possible to connect the movable portion 4 and the locking means via a link mechanism, a gear mechanism, or the like so that a force for operating the locking means is transmitted. Furthermore, the application target of the lock switching mechanism for the rotary operating handle according to the present invention is not limited to the lifting handle and the traveling handle of a concrete cutter, but various working machines (construction machines, agricultural machines, etc.). ) for similar rotary operating handles.

1: lifting handle,
2: handle shaft,
3: fixed part,
31: base end,
32: protrusion,
33: locking pin,
33a: lower half,
33b: upper half,
33c: tapered surface,
33d: lower end,
34: driven pin,
34a: upper half,
34b: lower half,
35: coil spring,
4: movable part,
41: tip,
42: pivot point,
42a: end face,
5: grip,
6: top cover,
61: engaging portion,
62: through hole,
71: blade,
72: fuselage frame,
73: front wheel,
74: support arm,
75: Link,
76: rear wheel,
8: tubular member,
81: top surface,
82: Spring,
9: wire,
A: central axis,
C: contact,
P: pivot point,

Claims (6)

A rotatably supported handle shaft, a handle stay consisting of a fixed portion and a movable portion, a pair of locking means capable of locking the handle shaft with respect to other elements by engaging with each other, and a locking means. A lock switching mechanism for a rotary operation handle having a transmission mechanism for transmitting force for operating the
the fixed part has a proximal end fixed to the handle shaft and a protruding part extending outward from the proximal end;
the movable part is pivotally attached to the protruding part of the fixed part so as to be rotatable from the extended state to the bent state, and is biased in the bending direction;
A lock switching mechanism for a rotary operation handle, wherein the movable portion and the lock means are connected by a transmission mechanism so that the lock means is operated by rotation of the movable portion. A cam mechanism comprising an end surface of the movable portion and a driven pin is provided as a transmission mechanism for connecting the movable portion and the locking means,
The driven pin is arranged in a hollow portion formed in the projecting portion of the fixed portion, is biased toward the movable portion, and is configured such that the tip thereof is always pressed against the end face of the movable portion,
The end surface of the movable portion is formed in a curved cam shape in which the distance from the point of contact between the driven pin and the end surface of the movable portion to the pivot point of the movable portion gradually decreases from the extended state to the bent state of the movable portion. 2. Lock switching of a rotary operating handle according to claim 1, wherein when the driven pin is rotated around a landing point, the driven pin moves linearly following the end face of the movable portion. mechanism. 3. The rotary operating handle according to claim 2, wherein the driven pin is urged toward the movable portion and pressed against the cam-shaped end face, thereby urging the movable portion in a bending direction. lock switching mechanism. A concrete cutter in which the lock switching mechanism for a rotary operation handle according to any one of claims 1 to 3 is applied to a lifting handle,
As a pair of locking means, an engaging portion that does not rotate together with the handle shaft and a lock pin that engages with the engaging portion to lock the rotation of the handle shaft,
When the movable portion is in the bent state, the lock pin engages with the engaging portion to lock the handle shaft , and when the movable portion is in the extended state, the lock pin and the engaging portion are disengaged to lock the handle shaft. A concrete cutter characterized in that it is configured to be in an unlocked state. The upper end of the handle shaft passes through a through-hole formed in the upper cover of the body of the concrete cutter and protrudes upward from the upper cover,
5. The concrete cutter according to claim 4, wherein a plurality of engaging portions are formed around the through-hole of the top cover. A concrete cutter in which the lock switching mechanism for a rotary operating handle according to any one of claims 1 to 3 is applied to a traveling handle,
having a pair of locking means capable of switching between a state in which the handle shaft and the drive shaft of the rear wheel are connected and a state in which they are not connected;
When the movable portion is in the extended state, the locking means is engaged to lock the handle shaft with respect to the drive shaft of the rear wheel, so that the rear wheel can be driven by rotating the traveling handle, and the movable portion is bent. A concrete cutter, characterized in that, when it is in this state, the locking means is disengaged and the rear wheel is free to rotate with respect to the handle shaft.

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