JPH0131629Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a link mechanism for lifting and lowering a support frame of an earth removal plate in a hand dozer.

Conventionally, the base ends of the left and right earth removal plates, which can be folded in half to the left and right, are pivoted so that they can be folded and rotated, and the lifting and lowering of the earth removal plate support frame is performed using a hydraulic cylinder that pivots the base ends to the machine frame. In a hand dozer that is configured to allow movement, the earth removal plate support frame is formed into a rectangular frame body, and the earth removal plate is provided at the center of the front of the earth removal plate support frame, so that the earth removal plate can be rotated from side to side. Because the hydraulic cylinders are installed on both the left and right sides of the earth removal plate support frame, the arrangement structure of the hydraulic cylinders for vertically tilting the earth removal plate is restricted, and the vertical tilting range of the earth removal plate is narrowly limited. Ta. Moreover, the vertical tilting is performed only by extension of a hydraulic cylinder, and in particular, a lift link mechanism for vertically tilting the earth removal plate is not provided.

In this invention, the earth removal plate support frame is formed into a rectangular frame body, with the left and right corners of the front end cut out, and a vertical support plate is provided rearwardly protruding from the rear surface of the front center part of the earth removal plate support frame. A lift link mechanism is interposed between the rear end of the support plate and a hydraulic cylinder connected to the base end of the machine frame, and the lift link mechanism is configured to tilt the soil removal plate up and down. It is an object of the present invention to provide a link mechanism for lifting and lowering a support frame of an earth removal plate in a hand dozer, which allows more functional earth removal work by expanding the operating range of vertical tilting.

An example of this invention will be explained based on the drawings.
A indicates a hand dozer, and the hand dozer A has a prime mover section a at the front of the machine body and an operating section b at the rear thereof. A transmission part c is arranged at the connection part between the prime mover part a and the operation part b, and a running part d is arranged below the transmission part c. Part e is arranged in series.

A fuselage frame 1 extends from the front to the rear at approximately the center of the fuselage, and below the frame 1, a traveling frame 2 extends from the front to the rear on both sides of the fuselage. An idler wheel 3 and a traveling drive wheel 4 are provided at both front and rear ends of the traveling frame 2, and a crawler belt 5 is suspended between the two wheels.

From approximately the center of the left and right running frames 2, an earth removal plate support frame 6 is provided with its base end pivoted 7 and projects forward. The support frame 6 is arranged to surround the front half of the fuselage, and the left and right corners of its front end are formed in a notched shape.A bracket 8 with a U-shaped cross section is welded to the front of the center part, and a pin The left and right earth removal plates 10, 10' are pivotally supported at their base ends by the pins 9, 9'.

Further, a vertical support plate 11 is continuously welded to the rear surface of the front end center portion of the earth removal plate support frame 6. Vertical support plate 1
A lift link mechanism 12 is connected to the rear end of the lift link mechanism 1 . That is, in the lift link mechanism 12, the tip of the link member 12-1 is connected to the rear end of the vertical support plate 11 by a pin 13, and the other end of the link member 12-1 is connected to the bell of the long rod 14-1. It is connected to the crank member 14 via a pin 15.
The other short rod 14-2 of the bell crank member 14 is provided to protrude downward at a substantially right angle to the long rod 14-1.
A boss portion 14-3 is formed at the base end portions of the short rods 1 and 14-2, and the boss portion 14-3 is pivotally supported by a pivot portion 16 fixed to the body frame 1.

Furthermore, the short rod 14-2 of the bell crank member 14
The distal end of the hydraulic cylinder 18 is connected via a pin 17 to a cylinder rod 18-1 of a hydraulic cylinder 18 for operating the lift link. The base end of the hydraulic cylinder 18 is
It is connected to a bracket 19 fixed to the body frame 1 via a pin 20.

Therefore, when the cylinder rod 18-1 is extended, the short rod 14-2 is pushed forward, and the short rod 14-2 is pushed forward.
The tip of the long rod 14-1, which is integrally constructed with the earth removal plate 2, rotates upward about the pivot 16, and supports the earth removal plate 1 through the link member 12, the vertical support plate 11, and the earth removal plate support frame 6.
0 and 10' are configured to be lifted upward.

Cylinder support arms 21, 21' are welded and protruded obliquely rearward on both sides of the center part of the vertical support plate 6, and the left and right earth removal plates 10, 10' are attached to the arms 21, 21'. Hydraulic cylinders 22 and 22' for actuating the earth removal plate are pivotally connected to the lift link mechanism 12, and the hydraulic cylinders 22 and 22' are also moved up and down via the vertical support plate 11. It is structured as follows. Reference numeral 23 denotes a horizontal frame, to which cylinder support arms 21 and 21' are fixedly welded, and both ends of which are welded and fixed to the ejector plate support frame 6, and whose base end is pivoted to the fuselage frame 1. When the hydraulic cylinder 18 for operating the lift link is extended, the short rod 14-2 of the bell crank member 14 connected to the tip of the cylinder rod 18-1 is pushed forward, and the long rod 14-1 is moved to the pivot point 16. Rotate upward to the fulcrum. Pin 15 at the tip of long rod 14-1
A link member 12- which is rotatably connected via
1 is connected to the vertical support plate 11 at its lower end, so the earth removal plate support frame 6 can be moved upwardly around the seven pivot points on the traveling frame 2 through the free rotation of the link member 12-1. It is something that can be tilted towards. Conversely, when the hydraulic cylinder 18 is shortened, the earth removal plate support frame 6 can tilt downward. By vertically tilting the soil discharging plate support frame 6, the soil discharging plates 10, 10' are vertically tilted together with hydraulic cylinders 22, 22' for operating the soil discharging plates. Moreover, even if the earth ejecting plate support frame 6 tilts up and down, the hydraulic cylinders 22, 22' for operating the earth ejecting plate
His actions were not affected in any way;
It can be rotated from side to side.

According to the present invention, a lift link mechanism and a hydraulic cylinder for operating the lift link are provided at the front end of the soil discharging plate support frame whose base end is pivotally supported by the traveling frames on both sides, and between the soil discharging plate actuating device and the fuselage frame. The lift link mechanism is actuated by the operation of the same hydraulic cylinder, and the earth removal plate support frame is tilted up and down greatly, so the vertical tilting range of the earth removal plate is widened, and the earth removal plate can be moved over a wide range as desired. Because it is directed to the position,
This has the effect of significantly improving the soil removal function.

[Brief explanation of the drawing]

FIG. 1 is a side view of the hand dozer, FIG. 2 is an explanatory diagram showing the operating state of the lift link mechanism of the present invention, FIG. 3 is a plan view of the present invention, and FIG. 4 is:
Side view of earth removal board etc. A...Hand dozer, 1...Airframe frame,
2...Traveling frame, 6...Earth removal plate support frame, 11
... Vertical support plate, 12 ... Lift link mechanism, 14
... Bell crank member, 18 ... Hydraulic cylinder,
19...Bracket.

Claims (1)

[Scope of utility model registration request] The base ends of the left and right earth removal plates 10, 10', which can be folded into two, are pivotably supported in the center of the front wheels of the earth removal plate support frame 6, whose base ends are pivotally supported on the traveling frame 2.
Hydraulic cylinder 1 whose base end is connected to the fuselage frame 1
In the hand dozer configured to raise and lower the soil removal plate support frame 6 around the base pivot portion 8, a vertical support plate 1 is provided at the front center rear surface of the soil removal plate support frame 6.
A lift link mechanism 12 is interposed between the rear end of the support plate 11 and a hydraulic cylinder 18 whose base end is connected to the fuselage frame 1. It is composed of a lift link member 12-1 whose lower end is connected to the vertical support plate 11, and a bell crank member 14 whose tip is connected to the upper end of the lift link member 12-1. A link mechanism for lifting and lowering an earth removal plate support frame in a hand dozer, which has 14 pivot parts 16 provided at the front end of a body frame 1.