Earth working – With drive means for tool or cleaner – Vibrating tool
Reexamination Certificate
1999-11-30
2001-06-12
Pezzuto, Robert E. (Department: 3671)
Earth working
With drive means for tool or cleaner
Vibrating tool
C405S182000
Reexamination Certificate
active
06244355
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a mount for reducing vibrations transmitted from a tool to a carrier vehicle, such as a tractor. More specifically, the mount isolates a tractor from the vibrations of a vibratory plow, or similar tool.
2. Description of the Prior Art
In the past, different approaches have been tried to minimize the transfer of vibrations from a tool to a carrier vehicle, such as a tractor. The vibrations generally tire out the tractor operator and cause the bolted parts of the tractor to come apart, necessitating re-tightening of these bolts. The wear on the tractor parts also increases. The vibrating tool, for example a plow, is generally mounted on a sub-frame having a vibrating means attached to the sub-frame. The sub-frame is held by vibration dampening means in a larger frame. Examples of this construction are shown in U.S. Pat. No. 5,526,590 (Palm et al.), U.S. Pat. No. 5,482,121 (Draney et al.), U.S. Pat. No. 3,746,100 (Hall et al.), U.S. Pat. No. 4,140,425 (Flippin) and U.S. Pat. No. 4,164,982 (Draney). These solutions all share the apparent disadvantage of excessive wear and tear on the vibration dampening means, due to the fact that the sub-frame is vibrating in all directions. This subjects the vibration dampening means to compression (tensile) and shear stress. Most vibration means are rubber pads (or similar material), and inherently much less suited to shear stress, as compared to tensile stress. The vibration dampening means therefor wear out excessively fast in these applications. Also, the efficiency of vibration damping is not high enough to properly dampen vibrations from reaching the tractor.
A further attempt to provide a vibratory plow construction with vibration dampening means is disclosed in U.S. Pat. No. 4,867,607 (Johnson et al.). This document discloses a pivotable part of the vibratory plow carrying frame. The frame elements are separated by air cushions (or resilient dampening means of other types), arranged to dampen vertical movement of the frame parts. This construction necessitates the use of extra frame parts, to achieve the pivoting of the frame, thus adding weight, complexity and cost to the construction. If solid rubber vibration dampers are used, they are objected to shear stress, which is detrimental to the life of such dampers.
SUMMARY OF THE INVENTION
It is an object of the invention to provide an improved vibration isolation mount, that prevents the action of shear stress on the vibration dampening means, while the mount successfully isolates a substantial portion of the vibrations generated by a tool attached to a tractor, whilst providing a high load capacity for the isolation mount.
In the invention, an isolation mount comprises a first mounting surface arranged on a vehicle. The first surface has substantially vertical first mounting lugs arranged at a lower end of the first surface, and a first fastening means for holding at least one pair of resilient means. The resilient means comprise first resilient means and second resilient means. The first fastening means is preferably arranged at a top end of the first surface. The isolation mount further has a pivoting means, which has a first side facing the first surface, a second side facing away from the first surface and substantially vertical second mounting lugs arranged at a lower end of the first side of the pivoting means. The second mounting lugs are attachable to the first mounting lugs via pins to form a first hinge, about which the pivoting means is pivotable. The pivoting means further has resilient means holding means arranged at a top end of the pivoting means. The first resilient means are arranged between the first side of the pivoting means and the first mounting surface whilst the second resilient means are arranged on the second side of the pivoting means being pressed against the second side by fourth resilient means holding means. The pivoting means is thus held between the first resilient means and the second resilient means at the top end of the pivoting means. The pivoting means is further fastened to a vibrating tool attachably mounted to the pivoting means via second fastening means.
The first fastening means preferably comprise one bolt and nut per pair of resilient means. The bolts cooperate with first bolt holes arranged in the first surface, second bolt holes arranged in the first fastening means, third bolt holes arranged in the first resilient means, fourth bolt holes arranged in the second resilient means, fifth bolt holes arranged in the pivoting means and sixth bolt holes arranged in the fourth resilient means holding means. The bolts are insertable from behind the first surface through the first bolt hole, with the bolt head preventing the bolt from going completely through the first bolt hole, through the second bolt hole of the first fastening means, through the third bolt holes of the first resilient means, through the fourth bolt holes of the second resilient means, through the fifth bolt holes of the pivoting means and through the sixth bolt holes of the fourth resilient means holding means. The nuts are arranged to screw onto threads on the bolts to securely hold the first resilient means, the pivoting means, the second resilient means and the fourth resilient means holding means onto the bolts.
The second fastening means preferably comprise substantially horizontal third mounting lugs, which cooperate, via second pins, with substantially horizontal fourth mounting lugs arranged on the vibrating tool, to form second hinges.
The fastening means further preferably comprises expansion limiting means arranged around the first and second resilient means, to physically limit the expansion of the pairs of resilient means during compression of the same.
The isolation mount preferably comprises three pairs of resilient means and three fastening means, although the actual number of pairs is dependent upon the application properties, such as available space and expected force to withstand for the mount.
The mount is preferably mounted on a tractor, which has a vibratory plow arrangement, or any other vibrating tool, held by a frame.
REFERENCES:
patent: 3746100 (1973-07-01), Hall et al.
patent: 4140425 (1979-02-01), Flippin
patent: 4164982 (1979-08-01), Draney
patent: 4867607 (1989-09-01), Johnson et al.
patent: 5482121 (1996-01-01), Draney et al.
patent: 5526590 (1996-06-01), Palm et al.
Armstrong R. Craig
Pezzuto Robert E.
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