Brushing – scrubbing – and general cleaning – Attachments – Optical-member-attachable cleaner
Patent
1997-05-12
1998-03-03
Graham, Gary K.
Brushing, scrubbing, and general cleaning
Attachments
Optical-member-attachable cleaner
15250001, 152503, 296 9615, 29614616, 2961461, 49160, 49197, 49 31, 49 72, B60S 108
Patent
active
057221081
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a windshield wiper control device for construction machines, and more particularly to a windshield wiper control device suitable for controlling operation of a windshield wiper which is installed on a front window of an operator's cab of construction machines such as hydraulic power shovels or the like.
TECHNICAL BACKGROUND
Hydraulic power shovels and hydraulic cranes are typical examples of construction machines. For instance, in the case of a hydraulic power shovel, the machine is generally arranged as shown in FIG. 8, including a vehicular base carrier 1 and an upper rotary body 2 which is rotatably mounted on top of the base carrier 1 through a swivel ring 3. Mounted on top of the rotary body 2, along with a front working mechanism (not shown) for excavation or other ground working jobs, is an operator's cabin 4 to be occupied by an operator for operating the hydraulic power shovel.
As shown in FIG. 9, the operator's cab is enclosed by structural members including frames 5 and roof 6, and provided with windows on four sides, i.e., front and rear windows and side windows. Fitted on the front side is a front window 7 which is vertically movable to and from a fully closed position and a fully open position. For this purpose, the frame 5 is provided with guide grooves 8 in wall portions adjoining opposite lateral sides of the front window 7. Each one of the guide grooves 8 includes a first guide groove section 8a which is inclined in conformity with inclination angle of the front window 7 (i.e., disposed vertically in case the front window is set in a vertically upright position), and a second guide groove section 8b which is extended parallel with the roof 6, contiguously turned from the upper end of the first guide groove section 8a. The guide groove 8 is formed in an arcuately curved form in the transitional corner portion which connects the first and second sections 8a and 8b with each other. Further, as shown in FIG. 10, for engagement in the guide grooves 8, the window 7 is provided with paired upper and lower rollers 9 which are projected sideward from opposite lateral sides of a window frame 7b which is fitted with a pane 7a.
Accordingly, the respective rollers 9 are positioned within the first guide groove section 8a as long as the front window 7 is in a closed position. However, upon lifting up the front window 7 to open same, the rollers 9 are moved along the guide grooves 8. At this time, firstly the upper rollers 9 are moved into second guide section 8b through the curved transitional section, followed by ascension and movement into the second guide section 8b of the lower rollers 9. The front side of the operator's cab is opened completely when the front window 7 is turned up substantially parallel with the roof 6. As a result, a broader view field is opened in front of the operator who is seated in the operator's cab 4, making it easier for the operator to confirm an excavating position on the ground immediately on the front side of the operator's cab 4, especially in the case of a deep excavating operation. A broad and clear view field can also be secured by opening the front window 7 when the window pane 7a is covered with dirt or other contaminants.
Since the hydraulic power shovel is used in open air no matter whether it rains or not, a windshield wiper assembly 10 is normally provided for the front window 7, and, on a rainy day, it is turned on to wipe water droplets and water films off the window pane 7a for securing a dear view field through the front window. The windshield wiper assembly 10 is generally constituted by an oscillating arm which is put in back and forth oscillating motion over a predetermined angle, and a wiping appliance which grips a wiper blade of resilient material in a blade holder, which has its middle portion pivotally connected to a fore end portion of the oscillating arm. The wiping appliance is moved back and forth by the oscillating arm, with the wiper blade in sliding contact with the surface of the windshield gl
REFERENCES:
patent: 5090082 (1992-02-01), Alber et al.
patent: 5570923 (1996-11-01), Taylor
Iwase Yoshimi
Sakyo Tsuyoshi
Graham Gary K.
Hitachi Construction Machinery Co. Ltd.
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