JP2006177020A - Truck type work platform - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily lift and lower a lifting-lowering work platform base while lightening and miniaturizing the whole truck type work platform. <P>SOLUTION: The truck type work platform has the work platform base 10 supported on a truck 1 in a freely vertically movable manner and an extensible ladder 12 built between the work platform base 10 and the truck 1. In the truck type work platform, the work platform base 10 is disposed in upright vertically to the truck 1 and supported at the lifting-lowering upper end section of an expansion frame 6 expanded and contracted and driven by an expansion driving means 9. In the truck type work platform, an upper end is supported rotatably in a rockable manner on the work platform base 10 side and a lower end on the truck 1 side in the peripheries of horizontal support shafts 31 and 34 respectively in a posture, in which the whole ladder is inclined obliquely so that the lower end side is separated from the expansion frame 6, in the extensible ladder 12, and the extensible ladder 12 is expanded and contracted while changing an angle of inclination with the lifting and lowering of the work platform base 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cart-type work platform including a work platform supported so as to be movable up and down on a cart, and a telescopic ladder constructed between the work platform and the cart.

This type of truck-type work platform is used in various directions for working at heights, but the conventional general truck-type work platform is raised and lowered by a vertically extendable telescopic frame standing on the carriage. A work platform is supported at the upper end, and a telescopic ladder is vertically interposed between the work platform and the carriage. Since the ladder-type work scaffolding having such a conventional configuration is in a state in which the ladder stands vertically, there is a problem that it is difficult for the worker to ascend and descend safely between the carriage and the work platform. . This type of truck-type work scaffolding in which ladders are installed obliquely is known from, for example, Patent Document 1 and the like, but the truck-type work scaffold described in Patent Document 1 has a work scaffold base with respect to the carriage. It was configured to be supported by an extendable frame that expands and contracts in an inclined direction parallel to the ladder.
Japanese Utility Model Publication No. 64-3734

  In the configuration of the carriage type work scaffold described in Patent Document 1 as described above, the telescopic frame itself is tilted in parallel with the ladder to be stretched and contracted diagonally, so that the lift of the raised work scaffold base is eliminated. In order to be able to work safely and have sufficient and sufficient durability, the telescopic frame needs to have a considerable bending strength, which increases the weight of the entire bogie type work platform, and hence the handling workability. The decline and significant cost increase was inevitable, and the practicality was poor.

  An object of the present invention is to provide a carriage-type work scaffold capable of solving the conventional problems as described above, and the means is shown with reference numerals of embodiments to be described later. 1 is a cart-type work scaffold comprising a work scaffold base 10 supported so as to be movable up and down, and a telescopic ladder 12 laid between the work scaffold base 10 and the carriage 1. Reference numeral 10 denotes a vertically extending upper end of the telescopic frame 6 which is set up vertically with respect to the carriage 1 and is telescopically driven by the telescopic driving means 9, and the telescopic ladder 12 has a lower end side away from the telescopic frame 6. In the posture in which the entire ladder is inclined obliquely, the upper end is supported on the work platform 10 side and the lower end is supported on the cart 1 side so as to be swingable around the horizontal support shafts 31 and 34, respectively. Change the tilt angle as the elevator moves up and down And has a configuration to be reluctant expansion and contraction.

  Regarding the implementation of the present invention having the above-described configuration, specifically, as described in claim 2, a safety handrail frame 11 can be provided on the work scaffold base 10. It is desirable to be able to switch to a lying posture that lowers the overall height including the safety handrail frame 11. Further, in this case, as described in claim 3, there can be provided locking means 44 for locking the safety handrail frame 11 switched to the lying posture to the cart side fixed frame portion 7 of the telescopic frame 6.

  According to a fourth aspect of the present invention, the telescopic frame 6 comprises a carriage-side fixed frame portion 7 and an elevating frame portion 8 that moves up and down the inside and supports the work platform 10 at the upper end. The driving means 9 is composed of a chain winding and feeding means 25 arranged inside the elevating frame part 8 and supported on the upper end side of the cart side fixed frame part 7, and the chain winding and feeding means 25 performs the winding and feeding operation. The end of the chain 27 is locked to the lower end of the elevating frame portion 8 so that the chain winding and feeding means 25 can be driven and operated by the operation handle 29 disposed on the laterally outer side of the cart side fixed frame portion 7. Can be configured.

  The carriage-side fixed frame portion 7 and the lifting frame portion 8 of the telescopic frame 6 are each provided with prismatic members 14a to 15d made of aluminum moldings arranged at four corners, respectively, as claimed in claim 5. Each of the prismatic members 14a to 15d is provided with a member mounting groove 18 having a transverse cross section extending in the longitudinal direction of the prismatic members 14a to 15d. 7 and the lifting guide rollers 19 and 20 interposed between the lifting frame portion 8 are fitted in the member mounting grooves 18 of the prismatic members 14a to 15d on the side where the rollers 19 and 20 abut. The bearing member 2 is provided with large-diameter flanges 19a and 20a, and is attached to the prismatic members 14a to 15d on the side supporting the rollers 19 and 20 via the member attaching grooves 18. , It can be pivotally supported the rollers 19 and 20 to 22.

  The telescopic ladder 12 includes a lower ladder portion 32 whose lower end is pivotally supported on the carriage 1 side, an upper end pivotally supported on the work scaffold base 10 side, and a lower end side on the lower side. The upper ladder portion 35 that overlaps the ladder portion 32 and the holding means 36 that holds the overlapping portions of the upper and lower ladder portions 32 and 35 so as to be able to move only relative to each other in the length direction in an overlapping state. The holding members 37 and 38 are attached to the left and right sides of the end portions of the upper and lower ladder portions 32 and 35 and hold the left and right sides of the mating ladder portions 35 and 32, and are attached to the inside of the holding members 37 and 38. And a synthetic resin sliding material 39.

  A pair of left and right bogie hand pushing operations arranged so as to sandwich the telescopic ladder 12 from both the left and right sides between the bogie-side fixed frame portion 7 of the telescopic frame 6 and the bogie 1. A bar 13 can be installed. Further, the cart side fixed frame portion 7 of the telescopic frame 6 can be covered with cover materials 60a to 60d that cover the outside thereof. In this case, as described in claim 8, the cover material 60a. It is desirable that the cover members 60b and 60d positioned in the front-rear direction of the carriage connecting at least the telescopic ladder 12 and the telescopic frame 6 are made of a transparent material.

  Furthermore, as described in claim 9, the carriage 1 has the telescopic frame 6 standing on one end in the longitudinal direction and the lower end of the telescopic ladder 12 supported on the other end. Outriggers 5a and 5b that can be withdrawn and retracted can be provided on the left and right sides of one end side of the carriage 1 which is constructed in a rectangular shape and is provided with at least the telescopic frame 6 standing. The outriggers may be linearly movable, but as described in claim 10, the outriggers are provided around the vertical support shafts 4 at the four corners of the carriage 1, and the outriggers 5a to 5d are provided. Locking tools 50a to 50d that lock in a retracted posture along the side of the carriage 1 can be provided.

  In addition, when the cart 1 is a rectangular shape in which the telescopic frame 6 is erected on one end in the longitudinal direction and the lower end of the telescopic ladder 12 is pivotally supported on the other end, As described in claim 11, not only the lower four corners of the cart 1 but also the moving wheels on the opposite side of the telescopic frame 6 at the upper end of the cart-side fixed frame portion 7 on the opposite side of the telescopic ladder 12. 61 can be disposed.

  According to the cart-type work scaffold according to the present invention having the above-described configuration, the work platform is configured to be supported by the upper and lower end portions of the telescopic frame that is erected vertically with respect to the cart and is telescopically driven by the telescopic driving means. Therefore, it is possible to give sufficient bending strength just by giving the telescopic frame an appropriate thickness, and like the conventional configuration where the work platform is supported by the telescopic frame that expands and contracts diagonally, It is necessary and sufficient to be able to work safely without causing the shaking of the raised work platform without incurring inconveniences such as overall weight increase, handling workability deterioration, and significant cost increase. It is very easy and easy to achieve a high durability. In addition, the ladder for ascending / descending the work platform does not need to be installed diagonally by hand with respect to the raised work platform, and is always installed diagonally regardless of the height of the work platform. Since it can be ascending and descending easily and safely, workability is also improved.

  In addition, according to the structure of Claim 2, the safety | security of the operation | work on a work scaffolding can be improved by presence of the safety handrail frame attached to the said work scaffolding. When moving the work platform, the safety handrail frame can be switched to the lying position, and the overall height including the safety handrail frame can be lowered. It is possible to increase versatility by expanding the area that can be passed and stored. Further, in this case, according to the configuration described in claim 3, the safety handrail frame is brought into the lying posture by locking the safety handrail frame switched to the lying posture to the cart side fixed frame portion of the telescopic frame. There is no risk that the work platform will be lifted by extending the telescopic frame while it is fixed, and it becomes easy to comply with the work procedure of raising the work platform after raising the safety handrail frame as expected.

  Moreover, according to the structure of Claim 4, the expansion-contraction drive means which expands-contracts an expansion-contraction frame can be comprised in the state in which only the operation handle is arrange | positioned outside the expansion-contraction frame, and also as a drive source Further, it is possible to use a chain winding and feeding means such as a ready-made chain block or lever block, which can be implemented at low cost.

  Moreover, according to the structure of Claim 5, although the trolley | bogie side fixed frame part and elevating / lowering frame part of an expansion-contraction frame can be comprised lightweight using the prism-shaped member which consists of aluminum molding materials, It is possible not only to easily and easily attach the bearing member of the lifting guide roller to an arbitrary height of the prismatic member by utilizing the member mounting groove with a wide cross section provided in the prismatic member, but for each lifting guide Since the large-diameter flange provided on the roller is fitted into the member mounting groove provided on the prism-shaped member on the contact side of the roller, the positioning of the counterpart frame portion by the peripheral surface of the roller, that is, , Positioning in a direction perpendicular to the axis of the roller and positioning of the opposite frame portion by the roller large-diameter flange, that is, positioning in the axis direction of the roller Simultaneously causing that can carried out, as compared with the case of arranging the rollers dedicated respectively to the positioning of each direction, significantly reducing the total number of elevation guide rollers, it is possible to reduce the cost.

  According to the structure of Claim 6, while being able to implement | achieve an extendable ladder with a simple structure, it can also suppress generation | occurrence | production of the squealing sound and dust at the time of the extension / contraction operation of the ladder accompanying raising / lowering of a working scaffold base In particular, it can be effectively used as a bogie work platform used in a clean room.

  Furthermore, according to the structure of Claim 7, although the hand-pushing movement of a trolley | bogie can be performed safely and easily using a trolley-hand pushing bar, the telescopic ladder is protected by the pair of left and right trolley bar pushing operation bars. The effect which can do and the reinforcement effect with respect to an expansion-contraction frame can also be acquired. In addition, it is possible to erection that is arranged so as to be sandwiched from both left and right sides. In addition, it is possible to use a pair of left and right trolley bar operation bars for handrails when ascending and descending at least the lower area of the telescopic ladder, and it is necessary to attach a dedicated handrail to the telescopic ladder Sex can be lost. In addition, it is possible to suppress dust scattering during expansion / contraction operation of the expansion / contraction frame by stretching a cover material that covers the outside of the fixed frame portion of the expansion / contraction frame, as described above. In particular, it can be effectively used as a trolley-type work scaffold used in a clean room. In this case, according to the configuration of claim 8, the trolley is manually pushed and moved by using the trolley hand pushing bar. The cover material does not become an obstacle to visual recognition in the forward direction of the cart at the time, and the cart can be safely pushed and moved.

  Furthermore, according to the structure of Claim 9, it keeps the plane | planar size of a trolley to the minimum necessary, and the side where a trolley | bogie does not protrude from an expansion-contraction frame at the time of the operation | work which the operator is carrying on the work scaffold base. The outrigger can surely prevent the cart (extensible frame) from falling over and the safety can be improved by the minimum necessary outrigger. When the outriggers are provided in this way, by adopting the configuration according to claim 10, the projecting direction of the outriggers at the four corners of the carriage with respect to the carriage is changed according to the arrangement of structures around the carriage at the time of work. The cart can always be positioned in the safest state, greatly improving safety, and when the outrigger is not used, it can be locked along the side of the cart so that the outrigger There is no risk of getting in the way of the carriage.

  Moreover, according to the structure of Claim 11, even if the expansion-contraction frame is fallen horizontally, the four wheels on the same side as the moving wheels disposed on the upper end of the fixed-frame portion of the expansion-contraction frame are also provided. Of the lower moving wheels, the pair of left and right moving wheels on the same side as the moving wheels can be grounded, and the whole can be stably supported by the moving wheels. This is convenient when loading and unloading trucks onto the truck bed or moving and storing them in a narrow space.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 4, reference numeral 1 denotes a carriage, which moves to the lower corners of a rectangular frame 2 having a long planar shape in the front-rear direction. The wheels 3 are disposed, and the outriggers 5a to 5d are attached to the four corners so as to be swingable horizontally around the vertical support shaft 4, respectively. Reference numeral 6 denotes a telescopic frame, which is vertically fitted on a front end portion in the longitudinal direction of the carriage 1 and is vertically fitted to the inside of the carriage side fixed frame part 7 so as to be vertically movable. The lift frame portion 8 and the expansion / contraction drive means 9 are configured. Reference numeral 10 denotes a work platform, which includes a safety handrail frame 11 that is supported horizontally by the upper and lower end portions of the telescopic frame 6, that is, the upper end portion of the elevating frame portion 8, and that can be raised and lowered. Reference numeral 12 denotes a telescopic ladder, which is on the front end in the longitudinal direction of the carriage 1 and the work platform 10 (specifically, the upper and lower ends of the telescopic frame 6, that is, the rear side of the upper end of the upper and lower frame portion 8). In between, it is constructed in a slanting state. 13 is a bar for pushing the cart manually, and the lower half of the telescopic ladder 12 is sandwiched between the left and right sides between the cart-side fixed frame portion 7 of the telescopic frame 6 and the rear end of the cart 1 in the longitudinal direction. As shown in FIG.

  Hereinafter, each part will be described in detail. As shown in FIGS. 5 to 7, the cart-side fixed frame portion 7 and the lifting frame portion 8 of the telescopic frame 6 are vertically oriented prismatic members made of aluminum moldings at four corners, respectively. 14a to 14d and 15a to 15d, and these vertically oriented prismatic members 14a to 14d and 15a to 15d are connected and integrated by horizontally oriented prismatic members 16, 16a and 17 at appropriate positions in the height direction. Configured. Thus, all the prismatic members 14a to 17 have the same cross section, and the base frame 2 of the carriage 1 also connects the prismatic members having the same cross section as the prismatic members 14a to 17 in a rectangular frame shape. It is configured. On the four side surfaces of the prismatic member constituting the cart side fixed frame portion 7 of the telescopic frame 6, the lifting frame portion 8, and the platform frame 2 of the cart 1, there is a transverse cross section continuous in the length direction of the prismatic member. A widened (house-shaped) member mounting groove 18 is provided so that the cross-sectional shape is symmetrical in both front and rear and left and right directions.

  Four elevating guide rollers 19 are pivotally supported in two upper and lower stages on the upper end portion of the cart side fixed frame portion 7 of the telescopic frame 6, and four elevating guide rollers 20 are pivotally supported on the lower end portion of the elevating frame portion 8. ing. These elevating guide rollers 19 and 20 are provided with large-diameter flange portions 19a and 20a having a width that fits just in the member mounting grooves 18 of the respective prismatic members at the center position in the width direction of the peripheral surface.

  Each elevating guide roller 19 at the upper end portion of the carriage side fixed frame portion 7 is provided with a horizontal horizontal axis on a bearing member 21 attached to inner surfaces facing each other of the prismatic members 14a, 14c and 14b, 14d forming a front-rear pair. By being pivotally supported around the center so as to be able to rotate, the circumferential surface of each roller 19 is adjacent to the lateral surface of each of the prismatic members 15a to 15d of the lifting frame portion 8 and the lateral surface of the lateral direction. The large-diameter flange 19a is fitted in the member mounting groove 18. Further, each lifting guide roller 20 at the lower end of the lifting frame portion 8 is horizontally horizontal in the front-rear direction on the bearing members 22 attached to the outer side surfaces of the prismatic members 15a, 15c and 15b, 15d forming a pair of front and rear. By being pivotally supported around the shaft center, the peripheral surface of each roller 20 is adjacent to the inner surface in the left-right direction of each prismatic member 14a-14d of the carriage side fixed frame portion 7, and the left-right direction A large-diameter flange portion 20a is fitted in the member mounting groove 18 on the inner surface of the inner surface.

  The bearing members 21 and 22 are attached to the nuts 23 that are loosely fitted in the wide end portions of the member mounting grooves 18 located on the mounting surfaces of the bearing members 21 and 22 of the prismatic members 14a to 15d so as not to rotate. This is done by screwing and fastening the front end of the bolt 24 that penetrates 21 and 22. Therefore, it is possible to arbitrarily adjust the mounting height of the bearing members 21, 22, that is, the shaft support height of the elevating guide rollers 19, 20 simply by loosening the bolt 24. Although not shown in the drawings, all the prismatic members including the connecting portion of the carriage 2 of the carriage 1 and the carriage-side fixed frame portion 7 (vertical prismatic members 14a to 14d) of the telescopic frame 6 are included. For joining L-shaped or T-shaped to each other, a triangular or L-shaped coupling fitting attached to the corner of the coupling portion is used together. The coupling between each side of the coupling fitting and each prismatic member is used. Can also be performed in the same manner as the mounting method of the bearing members 21 and 22 by the nut 23 and the bolt 24 using the member mounting groove 18.

  According to the configuration of the telescopic frame 6 described above, the lifting frame portion 8 that moves up and down with respect to the cart side fixed frame portion 7 is provided on the circumferential surface of each lifting guide roller 19 provided on the cart side fixed frame portion 7 and the roller circumferential surface. In contrast, the side surfaces of the prismatic members 15a to 15d on the side of the lifting frame portion 8 adjacent in the left-right direction, the peripheral surface of each lifting guide roller 20 provided in the lifting frame portion 8 and the roller peripheral surface are adjacent in the left-right direction. Positioned with respect to the left and right lateral directions by the side surfaces of the prismatic members 14a to 14d on the cart side fixed frame portion 7 to be performed, and in the front-rear direction, the large diameter flange portion 19a of each lifting guide roller 19 provided in the cart side fixed frame portion 7 is provided. And the member mounting groove 18 of the prismatic members 15a to 15d on the lifting frame portion 8 side into which the large-diameter flange portion 19a is fitted, and the lifting / lowering Positioned by the member mounting grooves 18 of the prismatic members 14a to 14d on the side of the carriage-side fixed frame portion 7 where the large-diameter flange 20a of each lifting guide roller 20 provided in the ram portion 8 and the large-diameter flange 20a are fitted. Although the elevating guide roller for positioning in the front-rear direction is not used, the elevating and lowering can be performed smoothly while maintaining the vertical posture.

  The expansion / contraction driving means 9 for extending / contracting the expansion / contraction frame 6 uses a chain winding and feeding means 25. The chain hoisting and feeding means 25 is generally called a lever block. As shown in FIGS. 1, 2, and 9, when the lifting frame portion 8 is in the ascending limit position shown in FIG. Using a pair of left and right horizontally oriented prismatic members 16a located at the intermediate height of the carriage side fixed frame portion 7 so as to be positioned at the center of the inside of the lift frame portion 8 above the lower end of the lift frame portion 8. It is suspended by a horizontal beam member 26 laid so as to cross the inside of the elevating frame portion 8. Then, the end portion of the chain 27 which is operated to be wound up and fed by the chain winding and feeding means 25 is locked at substantially the center position of the lower end of the elevating frame portion 8, and when the chain 27 is wound up, the chain 27 is fed out from the chain winding and feeding means 25. The free end portion of the hanging chain 27 is locked to the horizontal beam member 26 in a U-turn upward. The chain hoisting and feeding means 25 includes a rotation operation shaft 25a that is supported by a bearing 28 that is attached to the lower side of the one-side prismatic member 16a that extends to one side in the horizontal direction and supports one end of the horizontal beam member 26; And an operation handle 29 attached to an outer end portion of the rotation operation shaft 25a so as to be positioned laterally outside the cart-side fixed frame portion 7.

  Accordingly, by rotating the operating handle 29 in the chain winding direction and winding the chain 27 by the chain winding and unwinding means 25, as shown in FIG. The frame portion 8 can be lifted by the chain 27 to the ascending limit position shown in FIG. 1 and the telescopic frame 6 can be extended to raise the work scaffold 10 to the ascending limit position. Conversely, by rotating the rotation operation handle 29 in the reverse direction of the chain and extending the chain 27 from the chain winding and unwinding means 25, as shown in FIG. The raised / lowered frame portion 8 can be lowered by gravity according to the extension of the chain 27 to the lower limit position shown in FIG. 2, and the telescopic frame 6 can be reduced to lower the work platform 10 to the lower limit position.

  As shown in FIGS. 1 and 2, the telescopic ladder 12 has a lower ladder portion whose lower end is pivotally supported by a left and right horizontal support shaft 31 on the rear end portion of the frame 2 of the carriage 1 so as to be swingable back and forth. 32 and a support member 33 projecting backward from the rear side of the upper end of the lifting frame portion 8 of the telescopic frame 6 on the work platform 10 side, specifically, the support frame 33 by the left and right horizontal support shaft 34. The upper ladder portion 35 is pivotally supported, and the holding means 36 holds the free end portions of the upper and lower ladder portions 32 and 35 so as to overlap each other. Inclined to leave. As shown in FIG. 8, the holding means 36 is attached to both the left and right sides of the upper end portion of the lower ladder portion 32 that overlaps the lower end portion outside the upper ladder portion 35 (the side on which the operator ascends and descends). A pair of left and right L-shaped holding members 37 that hold the left and right side frames 35a and 35b of the ladder portion 35 from both the left and right sides, and left and right side frames of the lower ladder portion 32 attached to the left and right sides of the lower end portion of the upper ladder portion 35. A pair of left and right L-shaped holding members 38 for holding 32a and 32b from both left and right sides are provided, and a synthetic resin sliding material 39 is stretched on the L-shaped inner surface of each of the L-shaped holding members 37 and 38. Yes. 32c and 35c are step members that are installed between the left and right side frames 32a and 32b and between the left and right side frames 35a and 35b at equal intervals in the length direction.

  According to the configuration of the telescopic ladder 12 described above, the upper and lower ladder portions 32 and 35 are connected by the L-shaped holding members 37 and 38 so that only relative movement in the length direction is possible at the overlapping portions of the end portions. When the telescopic ladder 12 is expanded and contracted, the pair of left and right L-shaped holding members 37 at the upper end of the lower ladder portion 32 are connected to the left and right sides of the upper ladder portion 35 via the synthetic resin sliding material 39 inside. The pair of left and right L-shaped holding members 38 at the lower end portion of the upper ladder portion 35 are moved in relative sliding movement with respect to the frames 35a and 35b, and the lower ladder through the synthetic resin sliding material 39 inside thereof. The left and right side frames 32a and 32b of the portion 32 move relative to each other in the length direction. Thus, when the work frame 10 is lifted by extending the telescopic frame 6, the upper ladder portion 35 is pulled upward with respect to the lower ladder portion 32, and the tilt angle of the entire telescopic ladder 12 is reduced. The telescopic ladder 12 is extended while changing the direction. Conversely, when the working frame 10 is lowered by reducing the telescopic frame 6, the upper ladder portion 35 is lowered with respect to the lower ladder portion 32. The telescopic ladder 12 is contracted while the inclination angle of the entire telescopic ladder 12 is changed in the increasing direction. That is, regardless of the height of the work platform 10 with respect to the carriage 1, the telescopic ladder 12 that remains in an inclined posture connects the carriage 1 and the work platform 10, and the operator can use this inclined posture. It is possible to ascend and descend safely and easily with respect to the work platform 10 by using the telescopic ladder 12.

  As shown in FIGS. 1 to 4, the safety handrail frame 11 includes a front side frame 41 for connecting and integrating the left and right side frames 40 and the left and right side frames 40 on the side opposite to the side where the telescopic ladder 12 is provided, And a handrail bar 42 that is detachably mounted on the side of the left and right side frames 40 on the side where the extendable ladder 12 is provided. The lower ends of the work are pivotally supported on the left and right front ends of the work platform 10 (on the side opposite to the side where the telescopic ladder 12 is provided) by left and right horizontal concentric support shafts 43, around the support shaft 43. By rotating and standing forward, as shown in FIG. 1 and FIG. 3, the plane is switched to a standing posture that surrounds the periphery of the work platform 10 in a plan view, and rotated and tilted backward around the support shaft 43, so that FIG. And as shown in FIG. It can be switched to horizontal position overlying the upper end portion of the 6 upper part and telescopic ladder 12. The handrail bar 42 may be fixed between the left and right side frames 40.

  The safety handrail frame 11 includes locking means 44. The locking means 44 is provided on the left and right sides of the work platform 10 and the bolts 45 with grips provided at the lower ends of the support columns on the side where the telescopic ladder 12 of the left and right side frames 40 of the safety handrail frame 11 is provided. A screw hole 46 (see FIG. 2) through which a bolt 45 with a grip can be screwed and fastened when in the standing posture, and a pair of prismatic members 14a and 14b on the front left and right sides of the carriage-side fixed frame portion 7 of the telescopic frame 6 And a screw hole 47 (see FIG. 1) through which the grip bolt 45 can be screwed and fastened when in the lying posture.

  The outriggers 5a to 5d are perpendicular within a range of approximately 180 degrees in a direction away from the frame 2 from the retracted posture along the left and right sides of the frame 2 of the carriage 1 as shown in the phantom line of FIG. 3 and FIG. A grounding board 49 that can be swung horizontally around the support shaft 4 and that can be moved up and down by a screw jack 48 is disposed at the tip thereof. Moreover, the locking tools 50a-50d which lock each outrigger 5a-5d in the retracted attitude | position along the right-and-left both sides of the frame 2 are provided. The locking members 50a to 50d include a member 51 to be caught attached to each of the outriggers 5a to 5d, and a catch member 52 that is attached to the frame 2 and can automatically grip the member 51 to be caught by an elastic force. It consists of. Accordingly, the outriggers 5a to 5d to be used can be separated from the retracted posture locked by the locking tools 50a to 50d to a desired angle simply by pulling them strongly against the gripping elastic force of the locking tools 50a to 50d. The outriggers 5a to 5d that can be rotated horizontally and are no longer used are rotated to the retracted posture along the left and right sides of the frame 2 and automatically locked by the locking tools 50a to 50d. Rotating away from 2 can be prevented.

  The usage method of the carriage type work scaffold carried in by using the moving wheel 3 to the work site will be described. The outriggers 5a to 5d are rotated around the vertical support shaft 4 to move the carriage 1 from the retracted posture. Is switched to an action posture projecting outside at an appropriate angle, and the grounding board 49 at the tip is lowered by a screw jack 48 and grounded at an appropriate pressure to fix the carriage 1 at a fixed position. The outriggers 5a to 5d do not need to switch all of them to the action posture. For example, when the carriage 1 is approaching a building such as a wall and there is no fear of the building falling, Only the outriggers that can be projected in the direction can be switched to the action posture, and the amount and direction of the projection from the carriage 1 can be arbitrarily determined according to the situation around the carriage 1. If a sufficient floor space is secured around the entire area of the carriage 1, it is considered that the telescopic frame 6 is disposed at the front end of the carriage 1 as shown by a solid line in FIG. Thus, the pair of left and right outriggers 5a, 5b on the front end side is projected forward from the carriage 1 in a direction parallel to each other or slightly extended so that the lateral width of the carriage 1 is equal to that of the telescopic frame 6 (working platform 10). Considering that it is almost the same as the left and right lateral width, the pair of left and right outriggers 5c and 5d on the rear end side are preferably extended laterally from the carriage.

  If the carriage 1 is stably fixed at a fixed position using the outriggers 5a to 5d as described above, the work frame platform 10 is raised by extending the telescopic frame 6 as described above. In the above embodiment, the expansion of the telescopic frame 6 in the contracted state is prevented by the safety railing frame 11 in the fallen state that is locked to the cart side fixed frame portion 7 by the locking means 44. Before extending, the bolt 45 with the grip of the locking means 44 is loosened to unlock the safety handrail frame 11 in the lying state. Then, the safety handrail frame 11 is rotated up around the horizontal support shaft 43 to stand up, and the bolt 45 with grip is screwed into the screw hole 46 (see FIG. 2) on the work platform 10 side to secure the safety handrail frame. 11 is locked in the standing posture shown in FIG.

  When the safety handrail frame 11 is switched to the standing posture, the telescopic drive means 9 is operated to extend the telescopic frame 6, and the work platform 10 is moved to the ascending limit position shown in FIG. Raise it up. At this time, the extendable ladder 12 is also stretched with some change in angle. The chain take-up / feeding means 25 used for the extension / contraction drive means 9 ensures the reduction operation of the extension / contraction frame 6 due to gravity (lowering due to the gravity of the work platform 10) even for the maximum load applied to the work platform 10. If the work platform 10 has been raised to a predetermined height by operating the telescopic drive means 9, the operator can start boarding the work platform 10 immediately. When the expansion / contraction drive means 9 does not have such ability, or when it has the necessary ability but further increases safety, it is desirable to use an appropriate fall prevention means together.

  An example of the fall prevention means that can be combined with the configuration in the present embodiment will be described based on FIG. 10. The fall prevention means 53 shown in FIG. 10 has one vertical orientation of the elevating frame portion 8 in the telescopic frame 6. A strip-like member 55 attached to the prism-like member 15c along its length direction and provided with horizontal through-holes 54 at regular intervals in the length direction, and a horizontally-oriented prismatic shape of the carriage-side fixed frame portion 7 Regardless of the extension length of the telescopic frame 6 among the members 16, the prismatic member 16a having an intermediate height that is always adjacent to the outside of the belt-like member 55 is alternatively matched with the through-locking hole 54. A horizontal pin hole 56, a locking pin 57 that can be inserted and removed freely across the pin hole 56 and one selected through locking hole 54, and a lower pin when the locking pin 57 is not used. A locking pin holding plate 58 that can be inserted into the cable to hold the locking pin 57, and a cable body 59 such as a chain or a wire rope that connects the locking pin 57 and the locking pin holding plate 58 to prevent loss. It is configured.

  In the fall prevention means 53 configured as described above, when the telescopic frame 6 is extended to the maximum length and the work platform 10 is raised to the ascending limit position, the lowest penetration locking hole 54 and the pin hole 56 are matched. When the work scaffold base 10 is used at a height lower than that, the work scaffold base 10 is raised to a height at which one through-locking hole 54 and the pin hole 56 match. In any case, when the work platform 10 is raised to a predetermined height, the locking pin 57 is inserted over the one through locking hole 54 and the pin hole 56 that coincide with each other, and the carriage side fixing in the telescopic frame 6 is performed. The frame portion 7 and the lifting frame portion 8 are locked to each other by a locking pin 57, and the locking pin 57 reliably prevents an unexpected lowering of the work platform 10 accompanied by the lowering of the lifting frame portion 8, thereby enhancing safety. Can be increased.

  When the work scaffold base 10 is raised to a predetermined height, the worker uses the telescopic ladder 12 in which the upper ladder portion 35 is pulled up by the work scaffold base 10 and is in an extended state. The predetermined height work can be performed on the work platform 10.

  As shown in FIG. 1, the telescopic ladder 12 is configured such that when the work platform 10 is raised to the upper limit position, the upper end step member 32 c of the lower ladder portion 32 and the lower end step member 35 c of the upper ladder portion 35. Are arranged in parallel at the front and rear at substantially the same level, and when the telescopic ladder 12 and the fall prevention means 53 having the above configuration are employed, the interval between the through-holes 54 is set at the step member 32c of the telescopic ladder 12. , 35c, or 1 / integer (about 1/2 to 1/4). In other words, an operator who goes up and down the telescopic ladder 12 has an action of placing his / her feet on the step member 32c of the lower ladder portion 32 at the front in the overlapping portion of the upper and lower ladder portions 32 and 35 on the back side. It is desirable that the configuration is such that the step member 35c of the portion 35 is not obstructed or hardly obstructed.

  Further, FIG. 1 shows that an operator who goes up and down the telescopic ladder 12 can use the rear vertical portion 13a of the cart hand pushing operation bar 13 located on the left and right sides of the telescopic ladder 12 instead of a handrail. As shown, the rear vertical portion 13a of the cart hand pushing operation bar 13 can be configured to protrude rearward from the telescopic ladder 12 by an appropriate distance.

  When the work-type scaffolding is cleared after the work is finished, the locking pin 57 of the fall prevention means 53 is removed from the through-hole locking hole 54 and the pin hole 56, and the locking pin 57 is perpendicular to the locking pin holding plate 58. Then, the telescopic drive means 9 is operated to reduce the telescopic frame 6, and the elevating frame portion 8 and the work platform 10 at the upper end thereof are lowered to the lower limit position. In this state, when the uppermost through locking hole 54 of the fall preventing means 53 is configured to match the pin hole 56, the locking pin extends over the uppermost through locking hole 54 and the pin hole 56. 57 can be inserted to switch the telescopic frame 6 to an unextendable state.

  When the work platform 10 is lowered to the lower limit position, the bolt 45 with the grip of the locking means 44 that locks the safety handrail frame 11 in the standing posture is released to release the lock, and the safety handrail frame is released. 11 is rotated rearward and downward around the horizontal support shaft 43 to switch to a lying posture covering the upper end of the telescopic frame 6 and the upper end of the telescopic ladder 12 as shown in FIG. And the bolt 45 with a grip of the locking means 44 is screwed and fastened to the screw hole 47 (see FIG. 1) of the carriage side fixed frame portion 7, and the safety handrail frame 11 is locked in the lying posture.

  Thereafter, the grounding board 49 of the outriggers 5a to 5d in the working posture is raised by the screw jack 48, and the outriggers 5a to 5d are rotated around the vertical support shaft 4 so as to follow the left and right sides of the carriage 1. Switch to the retracted position. At this time, the outriggers 5a to 5d are automatically locked and held in the retracted posture by the locking tools 50a to 50d.

  Finally, the carriage 1 is moved to a predetermined place by manually pushing from the side where the extendable ladder 12 is located by using the carriage pushing operation bar 13, but is positioned forward as viewed from the operator at that time. If the telescopic frame 6 is a frame structure as shown in the above embodiment, the field of view is not disturbed so much and it can be operated by hand relatively safely. The telescopic drive means 9 and the cart side Maintenance and inspection for the elevating guide rollers 19 and 20 between the fixed frame portion 7 and the elevating frame portion 8 can be easily performed. On the other hand, when the telescopic frame 6 is a frame structure, the carriage side fixed frame portion 7 and There are problems that hands and clothes are sandwiched between the lift frame portion 8 and that dust generated due to slippage between both is easily scattered. Accordingly, if priority is given to solving such problems, the periphery of the carriage-side fixed frame portion 7 can be covered with the cover materials 60a to 60d as shown in phantom lines in FIG. In this case, at least the cover members 60b and 60d on both the front and rear side surfaces (both sides opposite to the side where the telescopic ladder 12 is provided) of the cart side fixed frame portion 7 obstruct the field of view when the cart 1 is pushed forward. It is desirable to use a material composed of a transparent material (preferably a transparent synthetic resin material). Of course, a cover material can be stretched on the side surface of the elevating frame portion 8 as long as it does not interfere with the elevating guide roller 19 and the rotation operating shaft 25a of the chain hoisting and feeding means 25, etc. For the purpose of covering each side of the elevating frame portion 8 protruding upward from the upper end, an automatic winding type is provided between the upper end sides of the carriage side fixed frame portion 7 and the upper end sides of the elevating frame portion 8. A screen can be stretched. The cover material that acts on each side surface of the elevating frame portion 8 can be partly or entirely made of a transparent material, if necessary, like the cover materials 60a to 60d.

  As shown in FIG. 2, when moving the cart-type work scaffold with the telescopic frame 6 contracted, as shown in FIGS. 1 and 2, the upper end of the cart side fixed frame portion 7 of the telescopic frame 6 or its vicinity is shown. If the moving wheels 61 are arranged on both the left and right sides (or one center in the left-right width direction) opposite to the side where the telescopic ladder 12 is located, When loading or unloading a truck-type work platform, or when moving this truck-type work platform in a place where the height of the vertical space is low, the four corners of the carriage 1 can be placed even if the carriage-type work platform is tilted 90 degrees forward. Of the lower moving wheel 3, the pair of left and right moving wheels 3 on the opposite side (front end side) to the side where the telescopic ladder 12 is located and the moving wheel 61 are landed to make the cart-type work platform. Can be movably supported.

It is a side view which shows a state when raising and using a work scaffold stand to a raise end position. It is a side view which shows a state when lowering | hanging a work scaffold to a descent | fall limit position and moving a trolley | bogie. It is a top view in the state of FIG. It is a top view in the state of FIG. It is a cross-sectional top view which shows the detailed structure of an expansion-contraction frame. It is an enlarged view of the principal part of FIG. The upper half is a cross-sectional view taken along the line XX in FIG. 5, and the lower half is a cross-sectional view taken along the line YY in FIG. Fig. A is a side view showing the main part of the extendable ladder, and Fig. B is a transverse plan view showing the upper holding member and a transverse plan view showing the lower holding member. Fig. A is a side view of the main part showing the telescopic drive means, and Fig. B is a longitudinal front view of the same. Fig. A is a partially cutaway side view of the main part showing the fall prevention means, and Fig. B is an enlarged transverse plan view of the main part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carriage 3,61 Wheel 4 Vertical support shaft 5a-5d Outrigger 6 Telescopic frame 7 Carriage side fixed frame part 8 Lifting frame part 9 Telescopic drive means 10 Work scaffolding base 11 Safety handrail frame 12 Telescopic ladder 13 Carriage manual push operation Bars 14a to 15d Vertically oriented prismatic members 16, 16a, 17 Horizontally oriented prismatic members 18 Member mounting grooves 19, 20 Lifting guide rollers 19a, 20a Roller large diameter flanges 21, 22 Roller bearing members 25 Chain winding and unwinding means 27 Chain 29 Operation handles 31, 34 and 43 of the chain winding and unwinding means Horizontal support shaft 32 Lower ladder portion 35 Upper ladder portion 36 Holding means 37 and 38 L-shaped holding member 39 Synthetic resin sliding material 44 Safety hand Locking means 45 for the sliding frame Bolts 46, 47 with grips Screw holes 48 Gur screw jack 49 Outrigger grounding panels 50a to 50d Outrigger lock 53 Drop prevention means 54 Through lock hole 56 Pin hole 57 Lock pin 60a to 60d Cover material

Claims (11)

  A work platform with a work platform supported so as to be movable up and down on a carriage, and a telescopic ladder constructed between the work platform and the carriage, wherein the work platform is attached to the carriage. The retractable ladder is vertically supported and supported by the upper and lower ends of the telescopic frame that is telescopically driven by the telescopic driving means, and the telescopic ladder is in a posture in which the entire ladder is inclined so that the lower end side is separated from the telescopic frame. The upper end is supported on the working platform side and the lower end is supported on the cart side so as to be swingable around a horizontal support shaft, and is configured to expand and contract while changing the inclination angle as the working platform is raised and lowered. A bogie work platform.   The bogie according to claim 1, wherein a safety handrail frame is attached to the work platform, and the safety handrail frame is configured to be switchable to a lying posture that reduces a total height including the safety handrail frame. Formula work scaffolding.   The cart type work scaffolding according to claim 2, further comprising locking means for locking the safety handrail frame switched to the lying posture to a cart side fixed frame portion of the telescopic frame.   The telescopic frame includes a carriage-side fixed frame part and an elevating frame part that moves up and down inside and supports the work platform at the upper end, and the telescopic drive means is disposed inside the elevator frame part and the carriage A chain winding and feeding means supported on the upper end side of the side fixed frame portion, and one end of the chain that is wound and fed by the chain winding and feeding means is locked to the lower end of the lifting and lowering frame portion, and from the chain winding and feeding means. The free end of the hanging chain is locked to the cart-side fixed frame portion, and the chain winding and feeding means can be driven and operated by an operation handle arranged on the lateral outer side of the cart-side fixed frame portion. The cart type work scaffold according to any one of claims 1 to 3.   The cart-side fixed frame portion and the lifting frame portion of the telescopic frame include prismatic members made of aluminum moldings arranged at the four corners, and each prismatic member is continuous in the length direction of the prismatic member. A member mounting groove having a transverse cross-sectionally widened shape is provided, and the lifting guide roller interposed between the carriage-side fixed frame portion and the lifting frame portion is provided in the member mounting groove of the prismatic member on the contact side. A large-diameter flange that fits into the shaft is supported by a bearing member that is attached to the prismatic member on the side that supports the roller via the member attachment groove. The cart type work scaffold described in any one.   The telescopic ladder includes a lower ladder portion whose lower end is pivotally supported on the cart side, an upper ladder portion whose upper end is pivotally supported on the work platform and the lower end overlaps the lower ladder portion, and upper and lower ladder portions. Holding means for holding the overlapping portions of each other in an overlapping state so as to allow only relative movement in the length direction.The holding means are attached to both the left and right sides of the end portions of the upper and lower ladder portions, and The cart type work scaffolding according to any one of claims 1 to 5, comprising a holding member that holds the left and right sides, and a synthetic resin sliding material provided inside each holding member.   A pair of left and right cart hand pushing operation bars arranged so as to sandwich the telescopic ladder from both the left and right sides are installed between the cart-side fixed frame portion of the telescopic frame and the cart. A carriage type work scaffold according to any one of the above.   A cover material covering the outside is stretched on the cart side fixed frame portion of the telescopic frame, and at least the cover material located in the front-rear direction of the cart connecting the telescopic ladder and the telescopic frame is the cover material, The cart type work scaffolding according to claim 7, which is made of a transparent material.   The cart has a rectangular shape in which the telescopic frame is erected on one end in the longitudinal direction and the lower end of the telescopic ladder is pivotally supported on the other end, and at least the telescopic frame is erected. The cart type work scaffolding according to any one of claims 1 to 8, wherein an outrigger that can be moved back and forth is provided on both left and right sides of the one end side.   The said outrigger is rotatably provided in the four corners of each trolley around a vertical axis, and is provided with a locking tool for locking each outrigger in a retracted posture along the side of the trolley. The truck-type work scaffold described in 1.   The cart has a rectangular shape in which the telescopic frame is erected on one end in the longitudinal direction and the lower end of the telescopic ladder is pivotally supported on the other end. The trolley type work scaffolding according to any one of claims 1 to 10, wherein a moving wheel is disposed on the opposite side of the upper end of the trolley side fixed frame portion of the telescopic frame from the side having the telescopic ladder.