BACKGROUND OF THE INVENTION
This application is a continuation-in-part of application Ser. No. 09/203,418, filed Dec. 2, 1998.
- PRIOR ART
The invention relates to cabs for land vehicles and, more particularly, to a cab construction for use with vehicles having an existing overhead guard.
Severe weather and other environmental conditions can create a need for a fully enclosed cab to protect the operator of a tractor or like machine. Frequently, a tractor is originally built with an overhead guard to provide roll over protection and/or protection from falling objects. U.S. Pat. No. 5,286,081 discloses a cab construction that successfully solves problems attendant with providing a serviceable and cost effective cab structure for certain types of machinery.
An increasingly popular style of tractor is the skid steer loader, hereinafter skid steer, which affords high maneuverability enabling it to be operated in relatively small areas. These skid steers typically have an operator seat in a forward position to provide a view immediately in front of the machine. Also typical of skid steer designs is the location of the lift arms for carrying and lifting a material handling bucket or other implement. The arms extend longitudinally of the machine on both sides of and immediately adjacent the operator station. To ensure against an operator inadvertently extending a hand or limb to the side and into the path of the lift arms, the operator station is equipped with side guards. Normally, the side guards are in the form of a grille that permits vision to the side but prevents extension of a hand or limb to the side. The side grilles generally are fixed to the overhead guard that is part of the original equipment. As a design criteria, a skid steer is a compact machine where little space or clearance is afforded between parts. This characteristic presents difficulties in fitting such a machine with a windshield or side windows.
- SUMMARY OF THE INVENTION
Besides being economical to construct and easy to install, a cab enclosure should be simple and easy to remove and reinstall where it is used, for example, to protect the operator during seasonal periods only, such as during winter months.
The invention provides a panel arrangement for enclosing the operator station cab of a vehicle that as originally manufactured includes an overhead guard. More specifically, the disclosed panel arrangement can include a combination door and windshield assembly for ingress and egress to the operator station and side window panels for sealing other areas surrounding the operator station. The windshield/door front panel assembly incudes a base panel door jamb that frames the door opening and is adapted to carry a swingable door on associated hinges. The door jamb panel presents a planar face that surrounds the door opening. The door has a peripheral seal, ideally, in the form of an elastomeric weatherstrip that reliably fully contacts the planar surface of the door jamb panel. Preferably, the door is hinged and configured to open with a simple outwardly swinging motion avoiding interference with the original standard parts of the vehicle.
On a typical skid steer the door jamb panel can be configured to lay over the front corner post of the overhead guard and to laterally engage these posts between a pair of integral opposed flanges disposed on the side faces of the posts. The door jamb panel is locked to the corner posts by a plurality of clips bolted or other otherwise secured to the panel plate and interlocking with the corner posts.
BRIEF DESCRIPTION OF THE DRAWINGS
Cab side window panels constructed in accordance with the invention take advantage of the existing rigid grille side walls customarily found on the overhead guard of a skid steer. In effect, the side panels of the invention utilize the guard as a support structure thereby avoiding the need to provide the side panels with a separate frame. The side panels, made of clear transparent sheet stock material in one form, are secured to the side grilles with a plurality of screws or like fasteners set into individual blocks extending on the inside face of the grille at strategic locations across the expanse of the side panels. The blocks are proportioned to ensure that the side panel sheets are drawn sufficiently tight against the grille to compress a weatherstrip sealing bead adjacent the perimeter of the panels. The disclosed mounting arrangement provides an adequate seal between the panels and overhead guard and, additionally, provide a simple mounting arrangement that takes up relatively small space in the limited clearance area between the sides of the overhead guard and the lift arms. Moreover, the unique mounting blocks enable the panels to be mounted by a single workman working from the outside of the cab. In a modified form of the side panels, they are arranged to be installed on the inside faces of the side grilles. Further, the side panels can be provided with vent windows or panes for ventilation of the operator station.
FIG. 1 is a perspective, somewhat schematic, view of a skid steer vehicle fitted with the cab enclosure panels of the invention;
FIG. 2 is a front view of the skid steer with the windshield/door unit in an open position;
FIG. 3 is a cross-sectional view taken in a horizontal plane indicated by the arrows 3-3 in FIG. 1 of the front part of the overhead guard of the vehicle and the windshield/door unit;
FIG. 4 is a fragmentary perspective view of a hinge for the windshield door unit;
FIG. 5 is a fragmentary cross-sectional view taken in the vertical plane indicated by the arrows 5-5 in FIG. 2 of a portion of the vehicle and a door jamb panel assembly of the invention;
FIG. 6 is a side view of a transparent sheet of a side window panel assembly;
FIG. 7 is a view of a typical block for securing a side window assembly to the side grille of the overhead guard;
FIG. 8 is a fragmentary cross-sectional view taken in a vertical plane showing a typical installation of a side window panel on a side grille of the overhead guard;
FIG. 9 is a perspective view of a modified form of the cab enclosure side window panel assembly;
FIG. 10 is a cross-sectional view of the modified side window assembly taken in the plane 10-10 in FIG. 9; and
DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG. 11 is a cross-sectional view of the modified side window assembly taken in the plane 11-11 in FIG. 9.
Referring now to the drawings, there is shown a land vehicle 10 in the form of a skid steer loader, referred to as a skid steer herein. The skid steer is generally conventional in overall layout having a fabricated steel chassis 11, a set of four wheels 12, and a motor, not shown, adjacent the rear of the vehicle. The illustrated skid steer 10 has a pair of spaced lift arms 13 on opposite sides of the chassis 11, operated by hydraulic piston and cylinder actuators 14. The arms 13 lift a bucket 16 or other working implement at the front of the skid steer 10.
A person operating the skid steer 10 sits in a seat 17 in an operator's station generally indicated at 18. The operator station 18 is surrounded by an overhead guard 19 that has four generally upright corners, the front corners or corner posts being designated by the numeral 21 and the rear corner or corner posts being designated by the numeral 22. The corner posts 21, 22 generally form the boundaries of the front, sides and rear faces of the overhead guard 19. The rear face of the guard is typically closed by a steel panel and/or a type of safety glass. The front face of the guard 19, as it is originally manufactured for the skid steer 10, is open to allow the operator to enter and exit.
At each side, the overhead guard 19 has a rigid grille 23 with sufficient openings 26 throughout its expanse to permit the operator to see through it in order to afford an adequate view of the surrounding field. In the illustrated case, the grilles 23 are formed by cutting rhomboid shaped openings or apertures 26 in a heavy gauge steel sheet 24. The openings 26 leave an integral network or matrix 27 of intersecting steel strips. The remaining steel network 27, after the holes 26 have been cut is effective to prevent an operator from inadvertently extending his hand or arm outward beyond the plane of the side grille or guard 23 into the operating path of a lift arm 13. Other grille constructions, such as a welded wire mesh are contemplated.
The front corner posts 21 are efficiently made by breaking non-apertured areas of the steel sheet forming the side grille 23 into a U-section 28 as shown in FIG. 3. Alternate corner post constructions are contemplated such as rectangular steel tubes welded to a side wall grille. The corner posts 21 and 22 support a steel sheet 29 forming the roof of the overhead guard in a conventional manner. The lower ends of the corner posts extend down and are supported on the chassis 11. The overhead guard 19 may be pivotally mounted at the rear corner posts to allow it to be swung upwardly and rearwardly for access to the drive train and other parts of the skid steer in a conventional manner. Where the overhead guard 19 is counter-balanced in this pivoting action by gas springs or other conventional devices it is desirable that accessory parts such as the protective panels of the invention to be described hereinbelow are of lightweight construction so as to avoid re-engineering of the factory supplied cab counter-balancing springs.
The above-described skid steer construction details are similar if not the same, in the products of various skid steer manufacturers. The overhead guard serves to protect the operator in a roll-over or from falling objects as well as to laterally confine his limbs so as to prevent their inadvertent extension into the path of the side lift arm mechanisms.
The invention provides a front panel assembly 31 that serves as a windshield and door and side panel assemblies 32 to enclose the space within the overhead guard 19 and thereby protect the operator from severe weather or other adverse conditions such as a dusty environment.
The front panel assembly 31 includes a base panel 33 that serves as a jamb for a door assembly 34. The door jamb base 33 is preferably fabricated of sheet steel and, in the illustrated case, is in the form of a generally rectangular continuous outline having a large generally rectangular cutout 35. The door jamb panel or base 33 has integral sides 36, header 37, and threshold 40. The generally vertical sides 36 of the door jamb 33 have integral flanges 38 bent perpendicularly rearwardly to the plane of a front face 39 of the major part of the door jamb. When installed on the overhead guard 19, this front planar face 39 is generally upright and slopes somewhat to the rear to conform to the slight inclination of the front corner posts 21. The flanges 38 are spaced from one another so that they fit closely over respective ones of the corner posts 21 of the overhead guard 19. More specifically, the flanges 38 overlie faces 41 of the corner posts 21 on the sides of the overhead guard. A sheet metal angle 42 forms a threshold for the door opening or cutout 35 and, as is shown in FIG. 5, is formed to seat on a cross member 43 of the skid steer chassis 11. A plurality of bolts 44 lock the door jamb 33 and threshold angle 42 together. With a flange of the threshold angle 42 resting on the cross member 43, the angle vertically supports the door jamb on the chassis 11. Upper portions of the door jamb 33 are removably fixed to the overhead guard 19 by J-shaped clips 47 located at a plurality of points along the length of the corner posts 21. The clips 47 are locked in position by bolts 48 that extend through holes 49 vertically spaced on the vertical sides of the door jamb 33. Study of FIG. 3 reveals that the door jamb 33 is laterally located and locked in position on the overhead guard by the integral flanges 38 which abut or nearly abut the side faces 41 of the corner posts 21. The door jamb 33 is locked against forward or rearward movement by the action of J-clips 47 which capture the corner posts 21 between retaining portions 51 of these clips and rear surface areas 52 of the door jamb plate 33. It will be understood that the door jamb 33 is thus releasably mounted to the overhead guard 19 and, particularly, to the front corner posts of the guard by surface areas of the jamb 33 and clips 47 which prevent any relative movement between the jamb and the corner posts but do not structurally alter the corner posts. In the preferred embodiment, the clips 49 at each side of the jamb 33 are relatively short in their vertical dimension, for example, being 1½″ tall. It is contemplated that the several clips at each side can be replaced by a continuous clip having a length comparable to the full length of a corner post.
The door assembly 34 is fabricated from steel sheet stock and includes a pair of sheets 56, 57 which are generally rectangular in their front profiles and have large cutouts for a windshield 58. An outer one of the sheets 57 has its edges bent outwardly to form a peripheral flange 59 for stiffening purposes. The sheets 56 and 57 are welded together at appropriate points to form a rigid structure. The windshield 58, made of safety glass, is carried on the inner one of the sheets 56 through the use of a conventional elastomeric mounting piece 61 along the perimeter of the glass, as is conventional. The door assembly 34 is hinged on one side of the door jamb 33 and is latched on the opposite side of the jamb. The hinge arrangement can comprise a pair of hinges 62. Portions 63 of the hinges 62 associated with the door jamb 33 can be welded directly to the door jamb. Mating portions 64 of the hinges 62 can be bolted to the door assembly 34; slots or oversize holes in the door allow the door to be adjusted for a proper fit with the latch on the opposite side. The latch, indicated at 67 is a commercially available unit that is hand-operated from either the inside or outside of the guard 19. A top 70 of the door jamb plate 33 lies below the plane of the underside of the overhead guard roof plate.
The periphery of the door sheet 56 is fitted with a commercially available elastomeric weatherstrip 71. The weatherstrip 71 includes an integral channel 72 which grips the peripheral edge of the sheet 56 and a hollow bulb 73 which permits the weatherstrip to compress so that it can seal surfaces which are not precisely parallel or planar in a known manner. It will be seen that the weatherstrip 71 is compressed and seals against the outer surface of the door jamb 33 which, as described, is substantially planar. The weatherstrip 71 has sufficient compliance, due to the bulb 73, to accommodate a slight offset of the lower threshold area of the door jamb 33 which projects slightly outwardly, as shown in FIG. 5. FIG. 3 shows the door assembly 34 in the closed position against the door jamb 33.
Optionally used with the front panel assembly 31 are the pair of side panel or side window assemblies 32. The side window assemblies 32 are in the form of left and right units that are mirror images of one another. Each side window assembly 32 includes a transparent sheet 77 preferably of a thermoplastic material such as polycarbonate or polyvinyl chloride or a suitable glass such as laminated safety glass or a tempered glass. The illustrated side window sheet is made of ⅛″ or ¼″ polycarbonate. The outline of a sheet 77 is cut in accordance with a boundary surrounding the side grille 23 so that its edges lie on those parts of the steel sheet 24 surrounding the grille 23. The typical skid steer has a generally planar boundary formed by parts of the overhead guard sides surrounding the grille or mesh protector. In instances where a side surface is not planar, suitable filler pieces can be provided to create a planar surface against which a side window assembly can seal. Alternatively, the side window assemblies can be non-planar to match the guard configuration. The side window assembly includes a weatherstrip 78, such as described in connection with the door assembly 34, fitted on the periphery of the window sheet 77. The side window assemblies 32 are releasably mounted on the overhead guard 19 with a series of identical mounting blocks 79. The mounting blocks or clips 79 in the illustrated example are square or rectangular units including a main body 81 and a flange forming plate 82. The illustrated main body and flange plate are steel pieces welded together. The main body 81 has a tapped hole 83 in its central region perpendicular to the plane of the flange plate. A plurality of mounting blocks are assembled on the window sheet 77 generally along but spaced inwardly of its periphery. The mounting blocks are retained on the sheet 77 by screws 84 assembled through holes 86 strategically located in the sheet 79. The holes 86 are located on the sheet 77 so that the mounting blocks 79 are registered with selected holes 26 provided by the grille or network 27. It will be understood that the flange plate or major profile of the mounting block or clip 79 is arranged to pass through its respective hole 26 when the block has a certain angular orientation about the axis of its screw 84 and hole 86. It will be understood that all of the mounting blocks 79 can be moderately tightened with their respective screws 86 against the window sheet 79 prior to mounting of the window assembly 32 on its respective overhead guard side grille 23. A workman can then install the window assembly 32 on the guard side grille 23 by tightening successive ones of the screws 86. Initial tightening movement of a screw 86 will rotate the block 79 so that the block is no longer oriented with the rectangular or rhomboidal pattern of its associated hole 26 and, consequently, the block and adjacent portion of the side window is fixed to the side grille 23. The blocks 79 are proportioned to moderately compress the weatherstrip bulb 73 against the side sheet 24 when the mounting block flange plate or tab 82 is in contact with the inside surface of the side sheet 24 (FIG. 8). To summarize, the mounting block in its original orientation for installation can pass freely through the associated grille hole 26 but when the screw 86 is thereafter tightened, the mounting block rotates a limited degree so that the flange plate is misaligned with the hole and cannot pass freely back out through such hole. The main body 81 is proportioned so that the mounting block cannot rotate through an angle approaching 90°. It will be understood that the side window assemblies can be installed by a single mechanic working comfortably outside of the overhead guard 19. The blocks 79 or their equivalents can be extruded or molded of suitable metal or plastic material.
An alternative construction of the side panel assemblies is shown in FIGS. 9-11. In this arrangement, side panel assemblies 90 are located on the interior of the side grilles 23 of the overhead guard 19. FIG. 9 shows the right side panel assembly 90; the opposite side panel assembly is essentially a mirror image of this illustrated panel assembly. FIG. 9 also shows the operator seat 17 and a right-hand control lever 91 for steering the skid steerer 10. The side panel assembly 90 comprises a main body 92 preferably formed of shatter-resistant clear plastic material such as polycarbonate or polyvinylchloride, or similar material. The main body 92 has a peripheral configuration that is like that of the side of the guard formed by the sheet 24 that comprises the grille 23. More specifically, the periphery of the main body 92, to the extent practical, overlies portions of the sheet 24 that surround the holes or apertures 26 of the grille. The periphery of the main body 92 is fitted with a weatherstripping 71 as previously described. In assembly, the weatherstripping 71 overlies parts of the side sheet 24 that are preferably imperforate. The side panel assembly 90 is retained on the side sheet 24 with blocks 79 as previously described in connection with the side panel assemblies 32. Shallow Allen-head or flat-head screws 96 are assembled through holes 97 at spaced locations near the periphery of the main body 92 to secure the blocks 79 to the assembly 90. The holes 97 are situated such that the blocks 79 are aligned with selected ones of the apertures 26 in the grille 23 so that the blocks 79 can be inserted into such apertures from the inside of the guard 19 and then locked in place by rotating the respective screw 96 as previously described in connection with the side assemblies 32. Again, the blocks 79 are proportioned so that when the screws 96 are tightened, the weatherstripping 71 is moderately compressed against the side sheet 24 to thereby effect a mechanical seal between these elements.
The panel assembly 90 includes a vent window subassembly 101. In the illustrated construction, the vent window assembly 101 comprises a generally rectangular frame 102 and a pair of horizontally slidable window panes 103, 104. The frame 102, which can be fabricated by bending a continuous strip of extruded aluminum, for example, as is known in the art, is attached to the main body 92 by screws 106 or in other suitable ways. The main body 92 has a cut-out or aperture 107 with dimensions corresponding generally to the inside planar dimensions of the frame 102. The frame 102 is extruded or otherwise formed with parallel tracks or grooves 108, 109, each track receiving one of the panes 103, 104 in a conventional manner. The horizontal length of each of the panes 103, 104, is slightly more than half the horizontal length of the frame 102. This construction enables the panes 103, 104 to slide in their respective tracks 108, 109 to either close or open the aperture 107 (the latter when the panes are largely overlapped). Finger grips 111 in the form of knobs or blocks or other structure are glued or otherwise attached to or formed on the panes to facilitate the opening and closing of these members by the operator seated in the operator's station 18 on the seat 17.
As shown in FIG. 11, a vertical edge 112, of one pane 103 is fitted with a weatherstripping gasket or seal 113, in the form of a flock filler supported on a U-channel generally known in the art. The seal 113 closes the gap between the panes 103, 104 while allowing them to slide relative to one another. The disclosed panel assembly 90, mounted on the inside of the guard 19, has the advantage of being protected by the guard grille 23 and enabling the operator to conveniently open or close the aperture 107 for ventilation purposes. The narrow edge profile of the panel assembly 90, shown in FIG. 10, assures that it does not significantly encroach on the space available to the operator.
If desired, the aperture 107 can be covered by a single pane, rather than the illustrated double panes 103, 104. In such a case, a modified frame can be substituted for the frame 102 and the equivalent of the seal 113 can be used to seal between this single pane and the main body 92. Alternatively, the aperture 107 can be closed with a hinged vent window pane. Still further, if desired, the aperture 107 can be eliminated and the vent window subassembly 101 can likewise be eliminated.
From the foregoing description, it will be understood that the front panel assembly 31 and side panel assemblies 32 or 90 are capable of being proportioned to fit various skid steer units manufactured by different companies. The front and side panel assemblies, are readily installed and removed as desired from season to season or job to job. Moreover, the side panel assemblies can be used without the front panel assembly and vice versa depending on the operator's preference.
It should be evident that this disclosure is by way of example and that various changes may be made by adding, modifying or eliminating details without departing from the fair scope of the teaching contained in this disclosure. The invention is therefore not limited to particular details of this disclosure except to the extent that the following claims are necessarily so limited.