Hand guide roller of manually steering type

Abstract: A hand guide roller of manually steering type is characterized by directly or indirectly connecting turnably a front support frame 2 for supporting a front roller 4 and a rear support frame 3 for supporting a rear roller 5 at a center part of a roller car main body through a rolling bearing, disposing a vibration generator 7 in vicinity of the rolling bearing 6 and transmitting vibration of the vibration generator 7 to at least one of the front roller 4 and the rear roller 5 via the rolling bearing 6.

Description: FIELD OF THE INVENTION The invention relates to a hand guide roller for leveling ground of roadbed and pavement, and more particularly to a hand guide roller of manually steering type to be steered by pushing and pulling a handle in a horizontal direction by man power. BACKGROUND OF THE INVENTION With respect to rollers for preparing the ground of roadbed and pavement, there are hand guide rollers among comparatively small sized rollers. This is demanded for simpleness in structure because of small size, and therefore, the steering is manual by pushing and pulling the handle in the horizontal direction by man power. The structure as shown in Fig . 5 has now been used widely as such hand guide rollers. A front and a rear rollers 4, 5 are supported by a frame, and a handle bar 9 is secured at the rear side of the frame. Within the frame, a one vibration generator (not shown) is provided to transmit vibration to the front and rear rollers 4, 5 through the frame. Advancing directions are, as shown in the same, changed by pushing and pulling the handle bar 9 by man power in the horizontal directions to steer the front and rear rollers 4, 5 together with the frame. Since this structure is sufficient with a one vibration generator and is not provided with a steering mechanism, it is very simple and economical in production cost, and thus, such a structure is most suitable to the hand guide roller. However, in this structure, when steering, the guide roller must be moved as a whole, and for pushing and pulling the handle, physical strength is required to a certain extent. Therefore, structures provided with the steering mechanism have been employed, making much account of laborsaving viewpoint. As the steering mechanisms, there are 1 ○ a mechanism of turning either one of the front and rear rollers with a turning axis positioned at the center of the roller, 2 ○ a mechanism of concurrently turning both the front and rear rollers with turning axes disposed at both rollers, and 3 ○ a mechanism where the frame for supporting the front and rear rollers is divided into two back and forth, and the divided frames are pivoted at the center of the roller car. Comparing these three steering mechanisms, 1 ○ has a defect that difference in inner wheels between the front and rear rollers is large during turning, and traveling loci are largely deviated in front and in rear, 2 ○ two turning axes are necessary to make the structure complicated and high cost, and in comparison, 3 ○ will be assumed to be most suitable, but has defects as under mentioned. Swiss Patent 429 605 describes a hand guided roller for transmitting vibrations from a vibration generator mounted on a frame to front and rear rollers in order to condense bottom material over which the roller is being guided by a handle. The frame supports a front roller near one end thereof and has a forked other end for receiving a block being journalled within the fork by means of an upper and a lower slide bearing and a vertical pivot axis. Each a horizontal axis extends from the left and right sides of the block for supporting two rear rollers, whereas a rod with a handle extends from the rear side of the block. By moving the rod to the left or to the right the block is pivoted about its pivot axis so that its two horizontal axes with the rear rollers are swivelled correspondingly to steer the machine. A vibration generator is mounted in the frame between the front and rear rollers and driven by a motor mounted upside of the frame. The vibrations are transmitted by the frame to the front roller and, in addition, via the bearing to the rear rollers. A hand guided roller according to the preamble of claim 1 is disclosed in DE-A- 2 264 813. Firstly, in the structure pivoting the front and rear supporting frames with the turning axis, since the turning axes and the bearing are opposite in a vertical direction, the height of the car is inevitably tall and this is a non preferable structure as the hand guide roller which requires compactness. When providing one vibration generator, since vibration is transmitted to at least either of the front and rear rollers via the axis, the turning axis and the bearing must be high strength, inviting high cost. On the other hand, if respective vibrators are disposed in respective interiors of the rollers as large sized guide rollers, members of high strength are not necessary, but two vibrators are required, and a structure for synchronizing both vibrators is required to also invite cost up. Merely with axis and bearing, since rattling is made large due to precision of both, high precision is required which is troublesome working while producing, and besides durability is uneasy. The invention has been devised in view of problems involved with the prior art, and accordingly it is an object to offer such a hand guide roller which is easy in steering, compact in the structure, and low in production cost. SUMMARY OF THE INVENTION For accomplishing this object, the hand guide roller of manually steering type in dependence upon the present invention is basically characterized by directly or indirectly connecting turnably a front support frame for supporting a front roller and a rear support frame for supporting a rear roller at a center part of a roller car main body through a roller bearing, disposing a vibration generator in vicinity of the roller bearing and transmitting vibration of the vibration generator to at least one of the front roller and the rear roller via the roller bearing. The invention employs the roller bearing for connecting the front supporting frame and the rear supporting frame, and specifically, these frames are directly or indirectly secured to an inner wheel and an outer wheel respectively, and are mutually turnable. The roller bearing is generally plain, so that the height of both cars can be made low. The roller bearing is stronger than the structure connected by the shaft and bearing, and is less rattling when vibration is transmitted from the vibration generator. Further, the high precision is not required, and the durability is superior. Since in the inventive structure, the front supporting frame and the rear supporting frame are mutually turnable via the roller bearing, the steering is easily carried out by pushing and pulling horizontally the handle bar provided at an optional position. These frames are turnably connected at the center of the car main body, so that smooth steering may be effected without causing large deviation in the traveling loci of the front roller and the rear roller. BRIEF DESCRIPTION FO THE DRAWINGS Fig.1 is a side view for explaining the structure of one embodiment of the invention; Fig.2 is a side view (partially in section) omitting the driving part as an engine mounted on the upper part shown in Fig.1; Fig.3(a) is a plan view of Fig.2, and (b) is seen along A-A of (a); Fig.4 is a plan view for explaining the steering condition of the embodiment, and (a) is a condition of steering to the right, (b) is a condition of steering to the left; and Fig.5 is a view for explaining the steering condition (right direction)of the manually steering hand guide roller. In the drawings, reference numeral 1 designates a roller car frame, 2 is a front supporting frame, 3 is a rear supporting frame, 4 is a front roller, 5 is a rear roller, 6 is a turning bearing, 7 is a vibration generator, 8 is a rod, 9 is a handle bar, 10 is a handle axis, 12 is a shock absorber, 18 is a driving part and 90 is a locking apparatus. PREFERRED EMBODIMENTS OF THE INVENTION Exemplified embodiment of the invention will be explained. Fig.1 is a side view, and Fig.2 is a side view taking off a driving part as an engine and others mounted on the upper part shown in Fig. 1 (showing an inner part partially in section). Fig.3(a) is a plan view, and Fig.4 is plan views showing steering conditions. As shown, the car frame 1 comprises the front supporting frame 2 and the rear supporting frame 3, and on the car frame 1 (more specifically, on the front supporting frame 2), the driving part 18 composed of the engine and others are provided via a base plate 16. In the car frame 1, the rear supporting frame 3 is composed of a part of the upper side of the rear roller 5, while the front supporting frame 2 is formed to cover largely over the rear supporting frame 3. Further, the front supporting frame 2 and the rear supporting frame 3 are mutually turnable via the roller bearing 6 at the center of the car. More specifically, an outer wheel 60 of the roller bearing is screwed with bolts, respectively in the front supporting frame 2, and an inner wheel 61 is screwed in a base plate 30 extending from the rear supporting frame 3. The front supporting frame 2 is turnably pivoted at the rear part with the handle bar 9. A bracket of the handle axis 10 is connected with the rod 8, and the end part of the rod 8 is connected with the base plate 30. The base plate 30 is a member which extends from the rear supporting plate 3 and is screwed with the inner wheel 61 of the roller bearing 6. Thus, by connecting the base plate 30 and the rod 8, if the handle bar 9 is actuated, the rear supporting frame 3 is turned (with respect to the front supporting frame 2) by the linkage therebetween. Accordingly, as seen in Fig.4(a), if the handle bar 9 is pushed to the right, the rear supporting frame 3 and the rear roller 5 are tilted right-upward, and if advancing under such a state, the car is steered to the right direction. Reversely, if the handle bar 9 is pushed to the left as shown in the same (b), the car is steered to the left direction. Namely, by pushing and pulling the handle bar 9, the steering can be easily operated. On the other hand, as shown in Fig.3, the locking device 90 is provided nearly the handle bar 9 (omitting in Fig.4), and this comprises a locking lever 91 pivoted turnably up and down and a locking hole 92 holding the basic part of the locking lever 91 when the locking lever 91 is turned upward, and the locking lever 91 is pivoted at the under surface of the base plate 16, while the locking hole 92 is secured to the rear supporting frame 3. Since the base plate 16 is fixed to the front supporting frame 2, when the locking lever 91 is tilted upward, the basic part thereof is held by the locking hole 92, thereby to lock the mutual actuation of the front supporting frame 2 and the rear supporting frame 3 linking the locking lever 91 and the locking hole 92. That is, the rear roller 5 is fixed and the steering cannot be made. Reversely, if the locking lever 91 is tilted downward, the basic part thereof is detached from the locking hole 92, and the front supporting lever 2 and the rear supporting lever 3 are freely turned by pushing and pulling the handle lever 9. When running on a road inclined leftward or rightward, the rear roller 5 is twisted incidentally, and when keeping forward, the handle bar 9 must be held, but the locking device 90 of the invention can avoid such labor. Further, when turning at right angle in a narrow place, it is sufficient to steer the car frame 1 as it is, and if locking the steering by means of the locking device 90, the same actuation is available. In addition, the rear roller 5 can be effectively prevented fromplaying by vibration during transportation. The vibration generator 7 is installed under the roller bearing 6, and the vibration therefrom is respectively transmitted to the front roller 4 via the front supporting frame 2, and to the rear roller 5 via the roller bearing 6, the base plate 30 and the rear supporting frame 3. The roller bearing 6 is flat and stable and has no matter in strength in regard to transmission of vibration. In the instant embodiment, the vibration is directly transmitted to the front roller 4 via the front supporting frame 2, and indirectly to the rear roller 5 via the roller bearing 6, and it is sufficient that the vibration generator is installed within the rear supporting frame 3 so that the vibration is directly transmitted to the rear roller 5 via the rear supporting frame 3 and indirectly to the front roller 4 via the roller bearing 6. After the base plate 30, the shock absorber 12 for steering is placed. With respect to the shock absorber 12, a frame shaped body 13 formed with a slit along an axial direction is fixed to the base plate 30 and is turned together with the rear supporting frame 3. The slit of the frame shaped body 13 is fitted with a fixing piece 14, and its head is screwed with one part of the front supporting frame 2 by a bolt. The fixing piece 14 is disposed at its right and left sides with springs 15(concretely, one end of the spring is held by the fixing piece 14 and the other end is held by a bracket of the frame shaped body 13). If the frame shaped body 13 slides with respect to the fixing piece 14, the spring effects elasticity such that the fixing piece 14 stands at the center. Therefore, when the rear support frame 3 turns, the frame shaped body 13 also relatively turns as it holds the fixing piece 14 in the slit, and even at such a case, the elasticity is effected by the spring 15 such that the fixing piece 14 stands at the center of the frame shaped body 13. On the other hand, since the fixing piece 14 is connected to the front supporting frame 2, when the steering is broken, the handle 9 is effected with a force that the handle always returns to a straightforward condition. Even when shock turning load is transmitted to the handle 9 from the running road, it is effectively cancelled by the shock absorber 12. In case that the car is given an incidental force and the steering is broken unexpectedly, the handle bar 9 can be instantly returned to the initial condition. When the handle bar 9 is pushed and pulled to make an optional steering, the handle is rapidly returned to the initial condition by releasing it. Thus, the inventive roller car has the holding function of the straightforward condition. As mentioned above, in the present embodiment, since the front supporting frame 2 and the rear supporting frame 3 are mutually turnable by means of the roller bearing 6, the steering can be easily carried out by pushing and pulling the handle bar 9 in the horizontal direction. In particular, the rear supporting frame 3 to be turned composes one part of the upper side of the rear roller 5, and the labor for pushing and pulling the handle bar 9 is sufficient with a small amount. Further, since the rolling bearing 6 is flat, the height of the roller car is made low, and the rolling bearing is turnably connected to the center part, so that there is no large lag in running loci between the front roller 4 and the rear roller, and the steering may be smooth. On the other hand, by the steering lock device 90, the rear roller 5 is fixed to easily hold the steering action when the steering is not necessary or turning at right angle. The vibration of the vibration generator 7 is transmitted to the rear roller 5 through the roller bearing 6, and since the rolling bearing is stably disposed, the vibration can be fully transmitted without causing a problem of the breakage. Consequently, the vibration generator 7 is one, it is cheap thereby. By the shock absorber 12, shock added to the handle bar 9 is absorbed and the straightforward condition can be kept appropriately. The present embodied structure is, as mentioned above, that the action of the handle bar 9 and the tilting action of the rear supporting frame 3 (the rear roller 5) are linked, and the pushing direction of the handle bar 9 and the steering direction are made agree with, but it may be permitted that, for example, the handle bar 9 is fixed to the back part of the front supporting frame, whereby the action of the handle bar 9 and the tilting action of the front supporting frame 2 (the front roller 4) are linked, and the pushing direction of the handle bar 9 and the steering direction are made reverse. Some of operators are acquainted with a structure a shown in Fig . 5 where the pushing direction of the handle bar 9 and the steering direction are reverse, and in such a case, this structure is of merit. As mentioned above, depending on the hand guide roller of the invention, basically, the structure is simple in using the roller bearing. It is possible to make the height of the car low, and the vibration generator is enough with one, so that the structure can be made very compact, resulting in low production cost. Further, the steering can be easily made by pushing and pulling the handle bar in the horizontal direction without causing a large lag in the running loci between the front and rear rollers, and in addition, since the roller bearing can be stable disposed, causing no chattering by vibration, and the roller car is superior in durability in comparison with a mere shaft and bearing structure.

Claims: A hand guided roller of the manually steering type comprising a front support frame (2) for supporting a front roller, a rear support frame (3) for supporting rear roller means, a bearing (6) for turnably connecting said front and rear support frames, and a vibration generator (7) for transmitting vibrations to said rollers, characterized in that said bearing being a generally plain roller bearing (6) connecting said front and rear support frames (2,3), and said vibration generator (7) being disposed in the vicinity of said roller bearing (6) so as to directly transmit vibrations to one of said front and rear rollers (4, 5) and indirectly transmit vibrations via the roller bearing (6) to the other of said rollers (4, 5).

Inventors: MUTSUJI MASAFUMI, SAWANO HIDETOSHI, MUTSUJI, MASAFUMI, SAWANO, HIDETOSHI, Mutsuji, Masafumi, c/o Kazo Kojo of Taikyoku Kenki, Sawano, Hidetoshi, c/o Kazo Kojo of Taikyoku Kenki
Applicants: TAIKYOKU KENKI CO LTD, TAIKYOKU KENKI CO., LTD.
Application year: 1999
Main classification: E01C19
IPC codes: E01C19