Tool driving or impacting – Impacting devices – Hammer head driven by relatively moving motion transmitting...
Reexamination Certificate
2000-04-21
2002-11-26
Smith, Scott A. (Department: 3721)
Tool driving or impacting
Impacting devices
Hammer head driven by relatively moving motion transmitting...
C173S114000, C173S122000, C173S171000
Reexamination Certificate
active
06484815
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an impact generator for rotating a weight by means of a rotary member and striking a struck member with the weight, thereby continuously generating impact force for working.
2. Description of the Related Art
An impact generator is a device for continuously generating impact, force (shock force). Such impact generator may be applied to a crusher for crushing concrete or hardened asphalt in a road construction, a building site and the like, a reaper for cutting off fruit and branches of plants, and a root cutter for cutting off roots of plants and the like, for example.
By way of example, Japanese Laid-Open Patent Publication No. Hei 7-95827 has disclosed an impact generator according to the prior art.
FIG. 10A
is a transverse sectional view showing the impact generator D
100
according to the prior art and
FIG. 10B
is a longitudinal sectional view showing the impact generator D
100
. The impact generator D
100
is applied to a reaper and serves to give continuous impact force to a cutting blade
191
. The impact generator D
100
converts rotating force transmitted from a power unit such as an engine into reciprocating impact force and transmits the reciprocating impact force to the cutting blade
191
.
As shown in
FIGS. 10A and 10B
the impact generator D
100
comprises a rotary member
110
and a weight
130
. The rotary member
110
is rotatably supported in a casing
150
by means of rotary shafts
111
and
112
. The rotary member
110
has plate-shaped holding portions
113
and
114
. The plate-shaped holding portions
113
and
114
are connected to each other through a connecting shaft portion
115
. The connecting shaft portion
115
is positioned eccentrically from the center C
100
of rotation of the rotary member
110
. Circular holes
113
a
and
114
a
are formed on the plate-shaped holding portions
113
and
114
, respectively. A cylindrical weight
130
is held in the holes
113
a
and
114
a
. The holes
113
a
and
114
a
have diameters which are larger than the diameter of the weight
130
. Therefore, the weight
130
can freely move to some extent in the holes
113
a
and
114
a
. More specifically, the weight
130
is movably held by the rotary member
110
.
When the weight
130
performs a circular motion around the rotary shafts
111
and
112
of the rotary member
110
by the rotation of the rotary member
110
, the top of a tappet
192
positioned to interfere with the locus of the circular motion is struck with the weight
130
. The tappet
192
is supported movably in an axial direction thereof (in a transverse direction in FIGS.
10
A and
10
B). Therefore, the tappet
192
is struck, thereby giving an impact to the cutting blade
191
positioned on the left of the tappet
192
in
FIGS. 10A and 10B
. Thus, when the rotary member
110
is rotated, continuous impact force is given to the cutting blade
191
.
Disk-shaped plates
165
and
166
are provided in the casing
150
. The plates
165
and
166
are provided in contact with upper and lower end faces of the weight
130
, thereby regulating a vertical position of the weight
130
which performs the circular motion.
In the impact generator D
100
described above, the tappet
192
is repeatedly struck with the weight
130
. Accordingly, if the lubrication of contact faces of the weight
130
and the tappet
192
is not well maintained, the contact faces are greatly worn. In order to keep the lubrication of the contact faces well maintained, it is preferable that a grease should be caused to adhere to the contact faces. Moreover, the weight
130
is caused to slide on the internal wall surfaces of the holes
113
a
and
114
a
of the rotary member
110
. In order to keep the slide on such wall surfaces well maintained, it is preferable that the grease should be caused to adhere to the weight
130
and the rotary member
110
. Furthermore, the weight
130
performs a circular motion while coming in contact with the plates
165
and
166
for regulating the vertical position thereof. Therefore, it is necessary to keep the lubrication well maintained here as well by causing the grease to adhere to portions between the weight
130
and the plates
165
and
166
.
However, when the rotary member
110
is rotated, the grease receives centrifugal force and gradually moves away from the center C
100
of rotation of the rotary member
110
. Therefore, the grease starts to keep away from the surfaces of the rotary member
110
and the weight
130
and to be collected on an inner peripheral wall surface
159
of the casing
150
. Consequently, the lubrication on the contact faces of the weight
130
and the tappet
192
becomes poor. Thus, the contact faces are greatly worn. Moreover, insufficient lubrication is caused between the weight
130
and the rotary member
110
, the plate
165
and the like.
SUMMARY OF THE INVENTION
In consideration of above-mentioned circumstance, it is an object of the invention to provide an impact generator capable of keeping good lubrication of a weight and other members which come in contact with the weight.
In order to solve the above-mentioned problems, the invention provides an impact generator comprising a rotary member for being rotated upon receipt of rotating force, a weight movably held by the rotary member for striking a struck member, and an impregnating member capable of impregnating a grease, wherein the impregnating member is extended from a vicinity of an inner peripheral wall surface of a chamber for accommodating the rotary member and the weight to a position where the impregnating member comes in contact with the weight performing a circular motion.
According to the impact generator described above, the grease reaching the inner peripheral wall surface of the chamber by centrifugal force is absorbed in the impregnating member. The weight comes in contact with the impregnating member while performing the circular motion. Therefore, the grease absorbed in the impregnating member adheres to the surface of the weight. Accordingly, the lubrication of the weight and other members which come in contact with the weight can always be kept well maintained.
In the above-mentioned impact generator, if the impregnating member is constituted to come in contact with a portion of the weight's face which abuts against the struck member, the grease supplied from the impregnating member can directly be applied to the face of the weight which abuts against the struck member.
In the above-mentioned impact generator, the impregnating member may be formed of any material which can impregnate the grease. For example, the impregnating member may be formed of felt.
In order to solve the above-mentioned problem, furthermore, the invention provides another impact generator comprising a rotary member for being rotated upon receipt of rotating force, a weight movably held by the rotary member for striking a struck member, gears for transmitting the rotating force from a power unit to the rotary member, a casing for accommodating the rotary member, the weight and the gears, and a separating plate for separating an internal space of the casing into a first chamber for accommodating the rotary member and the weight and a second chamber for accommodating the gears, and coming in contact with the weight to regulate a position of the weight, wherein at least one communicating portion for causing the first chamber to communicate with the second chamber is formed on the separating plate.
According to the impact generator described above, if the grease is put in the second chamber, it can move to the first chamber through the communicating portion. Accordingly, a surface of the weight in the first chamber can always be kept in a state in which the grease adheres thereto. Thus, the lubrication of the weight and other members which come in contact with the weight can always be kept well maintained.
In the above-mentioned impact generator, if the communicating portion is included in or interferes with a portion
Takemoto Kazuhiko
Yamane Yoshiro
Yashirodai Tadao
Kawasaki Jukogyo Kabushiki Kaisha
Oppenheimer Wolff & Donnelly LLP
Smith Scott A.
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