Hand Guide Roller

Abstract

To provide a hand guide roller including extremely reliable safety means while having a simple configuration.SOLUTION: A hand guide roller configured so that tilling a traveling lever 6 to a forward side allows an airframe to move forward, tilting it to a backward side allows the airframe to move backward, and the airframe stops when the traveling lever 6 is in a neutral position includes springs 9 (a front side sprint 9a and a rear aide spring 9b) that constantly bias the traveling lever 6 to the neutral position, a hold mechanism 10 that restrains the traveling lever 6 by a frictional force greater than a biasing force of the spring 9 during operation, and a safety lever for operating the hold mechanism 10, and is configured so that the hold mechanism 10 operates to restrain the traveling lever 6 only while the safety lever is operated.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vibratory roller used for compacting paved surfaces and ground surfaces, and in particular to a hand-guided vibratory roller (hand-guided roller). [Background technology]

[0002] A typical hand guide roller is configured so that the forward and backward movement of the machine body is controlled by a travel lever arranged on the operating handle. Specifically, the machine body moves forward when the travel lever is tilted forward, moves backward when tilted backward, and stops when the travel lever is set to the neutral position.

[0003] To ensure the safety of the operator, a hand guided roller equipped with a safety device (JIS standard A8508: hold-to-run control device) that automatically returns the travel lever to a neutral position and stops the machine when the operator lets go of it is also known (Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-240256 A [Patent Document 2] JP 2020-026767 A [Patent Document 3] JP 2014-163087 A [Patent Document 4] JP 2014-136890 A Summary of the Invention [Problem to be solved by the invention]

[0005] Many of the conventional safety devices applied to hand guide rollers have a complex device configuration, and are configured such that when the operator releases the safety lever, a biasing means on the safety device applies a biasing force to the travel lever to return the travel lever to the neutral position. Therefore, if a malfunction occurs in the safety device, for example, if a sufficient biasing force cannot be applied to the travel lever, there is a risk that the travel lever cannot be properly returned to the neutral position.

[0006] The present invention seeks to solve such problems in the prior art, and has an object to provide a hand guide roller that is simply configured yet equipped with highly reliable safety means. [Means for solving the problem]

[0007] The present invention relates to a hand guide roller in which the vehicle body can be moved forward by tilting the travel lever forward and backward by tilting it backward, and which is configured so that the vehicle stops when the travel lever is in the neutral position. The hand guide roller has a biasing means which always biases the travel lever toward the neutral position, a hold mechanism which, when activated, restrains the travel lever with a frictional force greater than the biasing force of the biasing means, and a safety lever for activating the hold mechanism, and is configured so that the hold mechanism operates to restrain the travel lever only while the safety lever is being operated.

[0008] Furthermore, it is preferable that the hold mechanism has a drum fixed to the axis of the traveling lever and a belt wrapped around the outside of the drum, and is configured so that when the hold mechanism is not in operation, the frictional force acting between the outer peripheral surface of the drum and the inner peripheral surface of the belt is smaller than the biasing force of the biasing means, and when in operation, the tension of the belt increases so that the frictional force acting between the outer peripheral surface of the drum and the inner peripheral surface of the belt is greater than the biasing force of the biasing means.

[0009] It is also preferable that the hold mechanism is composed of a first drum, a second drum, a belt, and a slide base, the first drum is fixed to the axis of the traveling lever, the second drum is fixed to the slide base in a state where it cannot rotate, the belt is wrapped around the outside of the first drum and the second drum, and the slide base is configured to be movable from a non-operating position close to the axis of the traveling lever to an operating position away from the axis of the traveling lever, and that when the hold mechanism is inoperable, the slide base is in the non-operating position so that the frictional force acting between the outer circumferential surfaces of the first drum and the second drum and the inner circumferential surface of the belt is smaller than the biasing force of the biasing means, and when the hold mechanism is operated, the slide base moves to the operating position so that the tension of the belt increases and the frictional force acting between the outer circumferential surfaces of the first drum and the second drum and the inner circumferential surface of the belt is larger than the biasing force of the biasing means.

[0010] Furthermore, it is preferable that a tightener that interferes with the belt from the outside is disposed between the first drum and the second drum, at a position where the belt can be pressed against the outer peripheral surfaces of the first drum and the second drum when the tension of the belt increases. Effect of the Invention

[0011] The hand guide roller according to the present invention has a simple structure, yet can be expected to have extremely high reliability and safety. More specifically, since the travel lever is always biased toward the neutral position regardless of the operation of the safety lever, even if a malfunction occurs in the hold mechanism or the safety lever, the travel lever can be reliably returned to the neutral position. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a side view of a hand guide roller 1 according to the present invention. [Diagram 2] FIG. 2 is a side view of the holding mechanism 10 disposed inside the housing of the operating handle 5 shown in FIG. [Diagram 3]FIG. 3 is an enlarged view of the operating handle 5 shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of the "hand guide roller" of the present invention will be described with reference to the attached drawings. Fig. 1 is a side view of a hand guide roller 1 according to the present invention, Fig. 2 is a side view of a holding mechanism 10 arranged inside a housing of an operating handle 5, and Fig. 3 is an enlarged view of the operating handle 5.

[0014] This hand guide roller 1 is used for compacting road pavements and ground surfaces, and is composed of a body 2 equipped with a prime mover (engine or electric motor), a hydraulic pump, and a hydraulic travel motor, etc., a pair of front and rear rollers 3, a handle stay 4 attached to the rear side of the body 2 (left side in Figure 1), and an operating handle 5 located at the tip (rear end) of the handle stay 4.

[0015] A travel lever 6 and a safety lever 7 are arranged on the operating handle 5, and a holding mechanism 10 (see FIG. 2) is arranged inside the housing. Of these, the travel lever 6 is for operating the forward and backward movement of the machine body 2, and is connected to the control means of the machine body 2 by a push-pull cable 16 (see FIG. 2). The hand guide roller 1 of this embodiment is configured such that when the travel lever 6 is tilted forward (to the right in FIG. 1), a forward propulsive force is supplied to the roller 3, causing the machine body 2 to move forward, and when the travel lever 6 is tilted backward (to the left in FIG. 1), a rearward propulsive force is supplied to the roller 3, causing the machine body 2 to move backward. When the travel lever 6 is in the position shown by the solid line in FIG. 1 (neutral position), no propulsive force is supplied to the roller 3, and the machine body 2 stops or is maintained in a stopped state.

[0016] A means for constantly biasing the travel lever 6 toward the neutral position is disposed inside the housing of the operating handle 5. Specifically, as shown in Fig. 2, springs 9 (front side spring 9a and rear side spring 9b) are disposed on the front and rear sides of the travel lever 6 as biasing means. The travel lever 6 is biased forward by the front side spring 9a and rearward by the rear side spring 9b, so that at the neutral position, the biasing force of the front side spring 9a and the biasing force of the rear side spring 9b are counterbalanced.

[0017] Therefore, when no external force is acting, the travel lever 6 is maintained in the neutral position (position shown by the solid line in FIG. 1), and when the external force is released in a position other than the neutral position, it returns to the neutral position. For example, when the operator releases the travel lever 6 while tilting it forward (forward), the travel lever 6 is pulled by the rear side spring 9b and returns to the neutral position. Similarly, when the operator releases the travel lever 6 while tilting it backward (reverse), the travel lever 6 is pulled by the front side spring 9a and returns to the neutral position.

[0018] In this embodiment, a tension coil spring is used as the means for constantly biasing the travel lever 6 toward the neutral position, but other biasing means, such as a compression coil spring, a spiral spring, a leaf spring, a gas spring, or other elastic members, can also be used. The mounting position of the biasing means is not particularly limited, and it can be mounted near the base end of the travel lever 6 as in this embodiment, or it can be mounted on a portion extending on the opposite side of the shaft 6a.

[0019] The hold mechanism 10 is configured to hold the travel lever in any position by using a frictional force greater than the biasing force of the spring 9 (biasing means) when activated. More specifically, the hold mechanism 10 is configured of a first drum 11, a second drum 12, a belt 13, a tightener 14, and a slide base 15, as shown in FIG.

[0020] Of these, the first drum 11 is fixed to the shaft 6a of the travel lever 6. That is, when the travel lever 6 rotates, the first drum 11 rotates together with the travel lever 6, and when the travel lever 6 is stationary, the first drum 11 is also maintained stationary. The second drum 12 and the tightener 14 are fixed to the slide base 15 in a state in which they cannot rotate.

[0021] The belt 13 is wound around the outside of the first drum 11 and the second drum 12. The tightener 14 is disposed at a position between the first drum 11 and the second drum 12, where it interferes with the belt 13 from the outside and can press the belt 13 against the outer circumferential surfaces of the first drum 11 and the second drum 12 when the tension of the belt 13 increases.

[0022] The slide base 15 is configured to be movable horizontally from the position shown by the solid line in FIG. 2(1) (position close to the shaft 6a of the travel lever 6) to the position shown by the dashed line (position away from the shaft 6a of the travel lever 6), and is biased toward the shaft 6a by a spring (not shown).

[0023] This hold mechanism 10 is adjusted so that when not in operation, the frictional force acting between the outer peripheral surface of the first drum 11 and the inner peripheral surface of the belt 13, and the frictional force acting between the outer peripheral surface of the second drum 12 and the inner peripheral surface of the belt 13 are smaller than the biasing force of the spring 9 (the force biasing the travel lever 6 toward the neutral position), and so that when in operation, these frictional forces are larger than the biasing force of the spring 9.

[0024] Specifically, when the holding mechanism 10 is in a non-operating state, the slide base 15 is in the position (non-operating position) shown by the solid line in Fig. 2 (1), and as shown, the belt 13 wrapped around the outside of the first drum 11 and the second drum 12 is adjusted to be in a slack state (state in which tension is extremely small). Therefore, the frictional force acting between the outer circumferential surfaces of the first drum 11 and the second drum 12 and the inner circumferential surface of the belt 13 is smaller than the biasing force of the spring 9.

[0025] On the other hand, when the hold mechanism 10 is in an operating state, the slide base 15 moves to the position (operating position) shown by the dashed line in Fig. 2(1), and the belt 13 is in a state where it is strongly pulled by the first drum 11 and the second drum 12 (a state where the tension is increased compared to when it is not in operation) as shown in Fig. 2(2). As a result, the frictional force acting between the outer circumferential surfaces of the first drum 11 and the second drum 12 and the inner circumferential surface of the belt 13 becomes larger than the biasing force of the spring 9.

[0026] In this embodiment, a tightener 14 that interferes with the belt 13 from the outside is arranged at a position between the first drum 11 and the second drum 12, and is configured to be able to press the belt 13 against the outer circumferential surfaces of the first drum 11 and the second drum 12 when the tension of the belt 13 increases. Therefore, compared to a case in which the tightener 14 is not arranged, the contact area between the outer circumferential surfaces of the first drum 11 and the second drum 12 and the inner circumferential surface of the belt 13 is increased, and therefore, the frictional force can be effectively increased when the hold mechanism 10 is operated.

[0027] The safety lever 7 is for operating the holding mechanism 10, and is connected to the slide base 15 by a wire cable (not shown) (or a link mechanism, a hydraulic mechanism, a connecting means combining them, or other connecting means). When the safety lever 7 is operated, more specifically, when the operator grips the safety lever 7 together with the rear part 8a of the handle grip 8 as shown by a solid line in FIG. 3 and pulls (tilts) it backward (left side in FIG. 3), the slide base 15 moves from the inoperative position shown by the solid line in FIG. 2(1) to the operative position shown by the dashed line. When the operator releases the safety lever 7, the safety lever 7 returns to its original position (the position before operation, shown by the dashed line in FIG. 3), and the slide base 15 moves from the operative position to the inoperative position.

[0028] The safety lever 7 and the hold mechanism 10 are configured as described above. By operating the safety lever 7, the hold mechanism 10 is activated, restraining the travel lever 6 and holding it in any position. By releasing the safety lever 7, the travel lever 6 is released and can be returned to the neutral position.

[0029] For example, if an operator grasps the travel lever 6 with one hand and tilts the travel lever 6 forward (forward) as shown by the solid line in Fig. 3, and operates the safety lever 7 with the other hand (grabbing the safety lever 7 together with the rear part 8a of the handle grip 8 and pulling it backward), the hold mechanism 10 is actuated and the travel lever 6 is restrained. More specifically, the slide base 15 moves from the inoperative position to the operative position, the tension of the belt 13 increases, and the frictional force acting between the outer circumferential surfaces of the first drum 11 and the second drum 12 and the inner circumferential surface of the belt 13 becomes greater than the biasing force of the spring 9. As a result, even if the operator releases the travel lever 6, it remains in the position it was in before the release (the state in which the travel lever 6 was tilted forward).

[0030] When the operator releases the safety lever 7, the safety lever 7 returns to its original position (the position before operation, the position shown by the dashed line in FIG. 3), and the travel lever 6 is released from the hold mechanism 10 (the restraint by the hold mechanism 10 is released) and returns to the neutral position (the position shown by the dashed line in FIG. 3) by the biasing force of the spring 9. The same operation occurs when the safety lever 7 is operated with the travel lever 6 tilted backward (towards reverse) and then released from that state.

[0031] In this way, the hand guide roller 1 of this embodiment is configured so that the hold mechanism 10 operates to lock the travel lever 6 only while the safety lever 7 is being operated, and the travel lever 6 can be quickly released and returned to the neutral position by releasing the safety lever 7. The travel lever 6 can be locked at any position, not just at the full forward position tilted all the way forward or the full reverse position tilted all the way backward, and therefore speed adjustment is also possible. [Explanation of symbols]

[0032] 1: Hand guide roller, 2: Aircraft, 3: Laura, 4: Handle stay, 5: Operating handle, 6: Travel lever, 6a: axis, 7: Safety lever, 8: Handle grip, 8a: rear, 9: Spring, 9a: Front spring, 9b: Rear spring, 10: Hold mechanism, 11: First drum, 12: Second drum, 13: Belt, 14: Tightner, 15: Slide base, 16: Push-pull cable,

Claims

1. A hand guide roller configured such that a machine body can be moved forward by tilting a travel lever forward and can be moved backward by tilting the travel lever backward, and the machine body stops when the travel lever is in a neutral position, The vehicle has a biasing means for always biasing the travel lever toward a neutral position, a hold mechanism for restraining the travel lever by a frictional force greater than the biasing force of the biasing means when actuated, and a safety lever for actuating the hold mechanism, The hold mechanism is configured to operate and restrain the travel lever only while the safety lever is being operated, The holding mechanism has a drum fixed to the shaft of the traveling lever and a belt wound around the outside of the drum, This hand guide roller is characterized in that, when the hold mechanism is not in operation, the frictional force acting between the outer peripheral surface of the drum and the inner peripheral surface of the belt is smaller than the biasing force of the biasing means, and, when the hold mechanism is in operation, the tension of the belt increases, causing the frictional force acting between the outer peripheral surface of the drum and the inner peripheral surface of the belt to be greater than the biasing force of the biasing means.

2. A hand guide roller configured such that the machine body can be moved forward by tilting a travel lever forward and can be moved backward by tilting the travel lever rearward, and the machine body stops when the travel lever is in a neutral position, The vehicle has a biasing means for always biasing the travel lever toward a neutral position, a hold mechanism for restraining the travel lever by a frictional force greater than the biasing force of the biasing means when actuated, and a safety lever for actuating the hold mechanism, The hold mechanism is configured to operate and restrain the travel lever only while the safety lever is being operated, The holding mechanism is composed of a first drum, a second drum, a belt, and a slide base, The first drum is fixed to a shaft of the travel lever, The second drum is fixed to the slide base in a non-rotatable state, The belt is wound around the outside of the first and second drums, The slide base is configured to be movable from a non-operating position close to the shaft of the travel lever to an operating position away from the shaft of the travel lever; This hand guide roller is configured such that, when the hold mechanism is not in operation, the slide base is in a non-operating position, and the frictional force acting between the outer surfaces of the first drum and the second drum and the inner surface of the belt is smaller than the biasing force of the biasing means, and, when the hold mechanism is in operation, the slide base moves to the operating position, increasing the tension of the belt, and the frictional force acting between the outer surfaces of the first drum and the second drum and the inner surface of the belt is larger than the biasing force of the biasing means.

3. The hand guide roller according to claim 2, characterized in that a tightener that interferes with the belt from the outside is disposed at a position between the first drum and the second drum, at a position where the belt can be pressed against the outer peripheral surfaces of the first drum and the second drum when the tension of the belt increases.

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