JP2017057675A - Carriage for work - Google Patents

Abstract

PURPOSE: To provide a carriage for work, easily and quickly installable on a high-place steel frame beam material of a steel frame structure by H-shaped steel or I-shaped steel, and enabling a building worker to execute building work while safely and efficiently moving on the high-place steel frame beam material of the steel frame structure.CONSTITUTION: A carriage comprises a base 1, a travel member 2 provided on both sides in the longitudinal direction of the base 1 and having a wheel 21 placed on a flange 91, a pair of left-right embracing-holding members 3 provided on both sides in the longitudinal direction of the base 1 and having a columnar roll 31 for embracing-holding both sides in the width direction of the flange 91 of a beam-shaped material 9 from the undersurface side, a rocking mechanism 4 for rocking the pair of respective left-right embracing-holding members 3 on both sides in the longitudinal direction of the base 1, an operation lever 5 for operating the rocking mechanism 4 and fixing means 6 for fixing the operation lever 5 in a predetermined position, and the pair of respective left-right embracing-holding members 3 on both sides in the front longitudinal direction of the base 1 are mutually separated and approached by simultaneously rocking by rocking operation of the operation lever 5.SELECTED DRAWING: Figure 1

Description

  The present invention can be easily and quickly mounted on a steel beam material at a high position of a steel structure made of H-shaped steel or I-type steel at a building site. Then, it is related with the work trolley | bogie for a construction worker to perform construction work, moving safely and efficiently.

  Conventionally, in a construction site, in a high place work at the stage of steel frame construction, a construction worker has been working as described below. First, in terms of safety, a safety belt is applied to the parent of the safety belt. In that state, the construction worker is moving to transport the building member in each work sharing to a predetermined mounting location.

  Specifically, there is a roof construction work as such work. In the roof construction work, a member such as a tight frame is used to construct the roof plate via a structural material such as a steel frame. A construction worker must mount such a member on the steel structure material, and the tight frame is a large quantity, and each is a very heavy member. Therefore, the physical and mental burden on the construction worker increases.

JP 2008-308921 A

  In a conventional construction site, in a high place work at the stage of steel frame construction, as described above, a construction worker carries out each work while carrying a building member to a predetermined position while providing a safety belt. Yes, most of them move on the steel frame by walking. However, many building materials are made of metal and heavy, and it is difficult for a construction worker to move within a predetermined range while taking care of safety, and the physical and mental burden on the construction worker is difficult. Was big. In particular, the risk of work increases for workers with little work experience and elderly workers.

  Therefore, in order to reduce the burden on construction workers and maintain safety, several pedestrians have been developed to carry building members and tools, etc., using steel beam materials for steel structures. . As a typical example of this type, for example, Patent Document 1 exists. Therefore, an article moving device in Patent Document 1 will be outlined. In addition, the code | symbol of the language used is described in patent document 1 as it is in parentheses.

  In Patent Document 1, a plate (3) fixed to a building member (1) to be moved, an H-shaped steel insertion groove formed by the plate (3), and an upper portion of the insertion groove are provided in the plate (3). Further, it is composed of a pair of freely rotatable wheels (10) facing each other apart from each other, and means for fixing the H-shaped steel inserted through the insertion groove and the plate (3) to each other.

  This type of truck is used for mounting on a flange of a steel beam material such as H-shaped steel or I-type steel at a construction site, and cannot be installed unless the truck is once disassembled, or a steel beam material. There are those that can only be mounted from the end of the carriage. For this reason, the conditions for mounting the carriage on the steel beam material are severe, and it takes time to set up or remove the carriage.

  In addition, there are various sizes of H-section steel or I-section steel that constitute steel beam materials, and these sizes cannot be handled by one bogie, but are adapted to each size. Was necessary. Therefore, an object of the present invention is to allow the construction worker to easily and quickly mount it on a high beam of a steel structure made of H-shaped steel or I-shaped steel at a construction site. When moving on a steel structure (beam) material, the construction work can be performed safely and efficiently by riding on a work carriage.

  Accordingly, as a result of earnestly researching the inventor to solve the above-mentioned problems, the inventor of the first aspect is applied to a work carriage that can move on a flange of a beam-shaped material such as H-shaped steel or I-shaped steel. A base on which an operator can sit, a traveling member provided on both sides in the longitudinal direction of the base and having wheels mounted on the flange, and provided on both sides in the longitudinal direction of the base and of the beam-like material A pair of left and right holding members having cylindrical rolls holding both sides in the width direction of the flange from the lower surface side, and a swing mechanism for swinging the pair of left and right holding members on both sides in the longitudinal direction of the base And an operating lever for operating the swinging mechanism and a fixing means for fixing the operating lever at a predetermined position, and the left and right sides of the base on both sides in the front longitudinal direction by the swinging operation of the operating lever. pair By having a working truck comprising mutually moved away and close by swinging the embracing member simultaneously, the above-mentioned problems are eliminated.

  According to a second aspect of the present invention, in the first aspect, the roll of the holding member is a work cart that is orthogonal to the longitudinal direction of the flange and is inclined with respect to the flat surface of the flange. The above problem has been solved. According to a third aspect of the present invention, there is provided a working carriage according to the first or second aspect, wherein the working cart is provided with locking means for locking and fixing at a plurality of positions in the swing range of the operation lever. did.

  According to a fourth aspect of the present invention, in the third aspect, the locking means includes a locking member having a plurality of locking grooves, an attachment portion that is fixed to the base, and a pivoting portion on which the locking member member swings. The above-mentioned problems have been solved by providing a working carriage in which the operating lever can be swung by swinging the locking member.

  According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect, the swing mechanism is configured such that the same gear is fixed to both the holding members, and both the gears are The above-mentioned problems have been solved by providing a working carriage in which both the holding members are swayed symmetrically by the rotation of both gears.

According to the first aspect of the present invention, a traveling member having wheels provided on both sides in the longitudinal direction of the base and mounted on the flange, and a width of the flange of the beam-like material provided on both sides in the longitudinal direction of the base. With the pair of left and right holding members having cylindrical rolls that hold both sides in the direction from the lower surface side, the work carriage is difficult to drop off against the flange of the beam-like material, and the beam-like material is kept in an extremely stable state. Can move on the flange.

  The construction worker can sit on the work cart of the present invention and move while kicking the flange located on the lower side of the beam-like material forward and backward with both feet. And a construction member, a tool, etc. can be mounted on a work trolley | bogie, and it can move to a desired position with a construction worker.

  In addition, the control lever includes a swing mechanism that swings the pair of left and right holding members on both sides in the longitudinal direction of the base in a symmetrical manner and an operation lever that operates the swing mechanism. With only the swinging operation, the pair of holding members on the front side and the back side on both sides in the longitudinal direction of the base can be operated so as to swing and approach in a symmetrical manner.

  As a result, the pair of holding members on the front side and the back side on both sides in the longitudinal direction of the work cart are all simultaneously opened and closed, and the work cart of the present invention is attached to the flange of the beam-like material and Removal can be done very easily. In addition, since the pair of holding members can be swingably opened and closed by the operation levers, the working carriage of the present invention can be attached and detached from any position in the longitudinal direction of the beam.

  As described above, the working carriage of the present invention can use a steel frame of a structure in a construction site as a rail for transportation, and a dedicated rail found in this kind of carriage, conveyor, etc. It becomes unnecessary. Therefore, the installation of the work cart of the present invention on the construction site is very simple, and when the work is completed, a pair of holding members on both sides in the longitudinal direction are provided via the operation levers of the work cart of the present invention. By swinging and opening, it can be removed very easily, and the work efficiency can be greatly improved.

  In the invention of claim 2, the roll of the holding member is orthogonal to the longitudinal direction of the flange and is inclined with respect to the flat surface of the flange. The holding member roll and the traveling member wheel hold the flange of the beam-like material in the vertical direction and the horizontal direction (width direction).

  As a result, the working carriage of the present invention can be configured to be extremely difficult to drop off from the flange of the beam-like material. According to the invention of claim 3, in the width direction of the flange of the beam-like material, the locking member can be locked and temporarily fixed at a plurality of positions in the swing range of the operating lever. The working carriage of the present invention can be mounted corresponding to various sizes of steel shapes.

  According to a fourth aspect of the present invention, the locking member includes a locking member having a plurality of locking grooves, an attachment portion that is fixed to the base, and a pivot portion that the locking member swings. Since the operation lever can be swung by swinging the member, the operation lever can be locked and unlocked very easily and quickly.

  In the fifth aspect of the invention, in the swing mechanism, the same gear is fixed to each of the holding members, the two gears are engaged with each other, and the both holding members are in a symmetric state by the rotation of the two gears. By adopting a swinging configuration, the swinging mechanism can be provided with a very simple configuration and at a low price.

(A) is a side view of the working carriage in the present invention, (B) is a plan view of the working carriage in the present invention, (C) is a view taken along arrow Y1-Y1 in (A), and (D) is (A). FIG. (A) is a front side enlarged view of a partially cut working carriage in the present invention, (B) is a cross-sectional view taken along arrow Y3-Y3 on the front side of (A), and (C) is X1-X1 of (B). An arrow view, (D) is a principal part perspective view in the state where the operation lever is fixed by the fixing means, (E) is a principal part perspective view in a state where the operation lever is released from the fixing means and is swingable. It is. (A) is a rear side enlarged view of a partially cut working carriage in the present invention, (B) is a cross-sectional view taken along arrow Y4-Y4 in the rear side enlarged view of (A), and (C) is a rear side of (A). X2-X2 arrow sectional drawing in the side, (D) is a principal part perspective view of the back side of the working trolley | bogie in this invention. (A) And (B) is a stroke diagram for attaching the work cart in the present invention to the flange of a beam-like material. It is a side view which shows the state which a construction worker sits on the work trolley | bogie in this invention, and moves.

  Hereinafter, the present invention will be described with reference to the drawings. The work cart of the present invention is mounted on a horizontal or horizontal steel structure material mainly at a high place and runs on the steel structure material at the stage of steel building construction at a construction site. As shown in FIG. 1, the working carriage is composed of a base 1, a traveling member 2, a holding member 3, a swing mechanism 4, an operation lever 5, and a fixing means 6.

  The longitudinal direction and the width direction are set in the working carriage in the present invention. The base 1 is formed in a rectangular plane, and the direction along the long side is the longitudinal direction, and the direction along the short side is the width direction (see FIG. 1). The working carriage in the present invention moves along the longitudinal direction of the base 1 in principle. Therefore, the longitudinal direction of the working carriage in the present invention may be referred to as the front-rear direction. And let one side in the longitudinal direction of the work cart be the front side and the other be the back side (see FIG. 1).

  The front side of the work carriage is the front side of the construction worker's face when the construction worker sits on the work carriage, and the back side is the back side (see FIG. 5). . The front side and the back side are words used for convenience of explanation. When the working carriage of the present invention is actually used, the front side may be the back side and the back side may be the front side. .

  The base 1 includes a main frame 11, leg portions 12 and a pedestal 13. The main frame 11 is formed in a rectangular shape by a horizontal frame member 11a and a vertical frame member 11b [see FIG. 1 (B)]. The horizontal frame member 11 a is the long side of the main frame 11, and the vertical frame member 11 b is the short side of the main frame 11. An intermediate reinforcing material 11c may be mounted along the width direction at a middle position in the longitudinal direction of the main frame 11 (see FIG. 1B). The horizontal frame material 11a and the vertical frame material 11b are formed by assembling a shape steel material such as an angle material or a channel steel using a fixing means such as welding.

  Further, leg portions 12, 12,... Are formed at both sides in the longitudinal direction on the lower surface side of the base 1. The leg portions 12 are provided in a total of four, and are vertically provided at positions near the four corners of the main frame 11 having a substantially rectangular planar shape. These legs 12, 12,... Are paired in the width direction of the base 1, and the pair of legs 12, 12 are provided on both sides in the front-rear direction of the base 1 (FIG. 1). reference). The lower ends of the leg portions 12 facing each other in the width direction are connected to each other by a connecting portion 12a, and the pair of both leg portions 12 are reinforced with each other via the connecting portion 12a [FIG. 1 (C), FIG. (See (B)).

  The traveling member 2 is attached to the lower end surface of each leg portion 12. The traveling member 2 includes a wheel 21 and a vehicle frame 22, and the wheel 21 is pivotally supported on the vehicle frame 22 [see FIGS. 1, 2 (A), (B)]. The traveling direction of the four traveling members 2, 2,... Follows the longitudinal direction of the base 1. That is, the base 1 travels along the longitudinal direction by the travel members 2, 2,... (See FIG. 5).

  A pedestal 13 is mounted on the upper surface side of the main frame 11 (see FIG. 1). The pedestal 13 is a rectangular plate and is made of a metal material, wood, or synthetic resin material. The pedestal 13 is fixed to the main frame 11 with fixing tools such as bolts and nuts. Alternatively, when the pedestal 13 is made of a metal material, the main frame 11 may be fixed to the main frame 11 by welding. The construction worker sits on the pedestal 13 (see FIGS. 4B and 5). Therefore, the pedestal 13 is preferably made of a material having flexibility or elasticity.

  Two holding members 3 are provided on both sides in the longitudinal direction of the base 1, that is, on the front side and the back side so as to form a pair of left and right corresponding to the respective width directions [FIG. 1 (B), (See (C) and (D)). The pair of left and right holding members 3 and 3 are swingably attached to the base 1 via legs 12 and 12 provided on both sides in the longitudinal direction of the base 1 [FIGS. 2B and 3]. (See (B)). A pair of left and right holding members 3, 3 on the front side and the back side of the base 1 are configured to always move toward and away from each other while swinging while maintaining a symmetrical shape. 1 (C), (D), FIG. 2 (A), FIG. 3 (A)].

  The holding member 3 includes a roll 31 and an arm-shaped frame portion 32 [see FIGS. 1, 2A, 2B, and 4D]. The roll 31 has a cylindrical shape, and the material thereof is made of metal, synthetic resin, or rubber. As for the arm-shaped frame part 32, the rocking | fluctuation collar part 32a and the roll receiving part 32b become a substantially right angle. Specifically, the swinging hook part 32a and the roll receiving part 32b are formed to have a substantially “L” shape or a substantially “<” shape. The arm-shaped frame portion 32 is formed by machining from an angle material having a substantially L-shaped cross section, for example.

  A roll 31 is rotatably supported on the roll receiving portion 32b. The pair of left and right arm-shaped frame portions 32, 32 have a substantially “<” shape and a substantially inverted “<” shape when viewed from the front side and the back side on both sides in the longitudinal direction of the base 1. 1 (see FIGS. 1C, 1D, 2A, and 3A). The axial direction of the roll 31 is orthogonal to the longitudinal direction of the base 1.

  Further, in a state where the work carriage of the present invention is mounted on the flange 91 of the beam member 9 having a steel structure, the flat surface of the flange 91 is seen from the front side and the back side on both sides in the longitudinal direction of the base 1. Then, it comes into contact with both lower ends in the width direction in an inclined manner (see FIGS. 1C, 1D, 2A, 3A, 4B, etc.).

  In each of the pair of holding members 3, 3 on the front side and the back side of the base 1, the holding member 3 located on one side (for example, the left side) in the width direction on the front side corresponds to the holding member 3. The holding members 3 located on one side in the width direction on the back side are connected to each other by a connecting shaft portion 33 [see FIGS. 1A, 1B, 2B, and 3C. ].

  Similarly, the holding member 3 located on the other side (for example, the right side) in the width direction on the front side and the holding members 3 located on the other side in the width direction on the back side corresponding to the holding member 3 are And are connected by a connecting shaft portion 33 [see FIGS. 1A, 1B, 3B, 3C]. The connecting shaft portion 33 and the holding member 3 are fixed to each other by fixing means such as welding or screws, bolts or keys.

  Both the connecting shaft portions 33, 33 pass through through holes 12b, 12b,... Formed below the respective leg portions 12, 12,... And are pivotally supported on the base 1 [FIG. See FIGS. 3B and 3C]. A pair of left and right holding members 3, 3 provided on the front side and the back side on both sides in the longitudinal direction of the base 1 are holding members on one side in the width direction via the connecting shaft portions 33, 33. 3 and 3 and the holding members 3 and 3 on the other side in the width direction are configured to be able to swing at the same time so as to maintain left-right symmetry [FIGS. 1 (C), (D), FIG. 2 (A), FIG. 3 (A)].

  Next, the swing mechanism 4 serves to swing the symmetrical holding members 3 and 3. As an embodiment of the swing mechanism 4, the same gears 41, 41 are fixed to the pair of left and right holding members 3, 3 on the front side and the back side on both sides in the longitudinal direction of the base 1. In the embodiment of the present invention, the swing mechanism 4 is provided on the back side of the base 1. Further, the same gears 41 and 41 mean that the pitch circles of both the gears 41 and 41 are the same, and the modules are the same with the same number of teeth.

  The two gears 41 and 41 mesh with each other, and the two holding members 3 and 3 can swing in a symmetric state by the rotation of the two gears 41 and 41. The holding member 3 and the gear 41 are fixed by various fixing means, and the holding member 3 and the gear 41 are operated simultaneously. Specifically, the pin member 34 is fitted between the arm-shaped frame portion 32 of the holding member 3 and the gear 41, and both are connected and fixed (see FIG. 3B).

  The pair of holding members 3 and 3 on the front side and the back side on both sides in the longitudinal direction of the base 1 are separated from and close to each other along the width direction, and both holding members 3 and 3 are close to each other. In this state, both the holding members 3 and 3 are close to each other at the center in the width direction of the base 1 [see FIG. 4 (B)]. Further, when the pair of holding members 3 and 3 are in a state of being maximally separated from each other, they are separated from each other more widely than the width direction of the flange 91 of the beam-like material 9 on which the work carriage is to be mounted [FIG. )reference〕.

  As described above, the pair of holding members 3 and 3 on the front side and the pair of holding members 3 and 3 on the back side on both sides in the longitudinal direction of the base 1 are connected to the connecting shaft portion 33 and the swing mechanism 4 (gears). 41, 41) can all swing simultaneously. Therefore, the pair of holding members 3 and 3 on the front side and the pair of holding members 3 and 3 on the back side on both sides in the longitudinal direction of the base 1 are simultaneously separated and approached.

  Next, the operation lever 5 is attached to any one of the pair of holding members 3, 3 on the front side in the longitudinal direction of the base 1 or the pair of holding members 3, 3 on the back side. . Then, by swinging the operation lever 5, one holding member 3 to which the operation lever 5 is mounted swings, so that all the other holding members 3, 3 are connected via the swing mechanism 4. , ... can be swung. The operation lever 5 is fixed to the holding member 3 by fixing means such as welding [see FIGS. 2A and 2B].

  The operating lever 5 is operated to swing along the swinging direction of the holding member 3 (the width direction of the base 1). The operation lever 5 is provided with a handshake part 52 at the shaft end of the operation shaft part 51. The handshake part 52 has a thickness that is easy for a construction worker to grip. The swinging range of the operating lever 5 is such that the pair of holding members 3 and 3 can be separated from the flange 91 of the beam-like material 9 with sufficient clearance and mounted on the flange 91 of the beam-like material 9. The distance between the pair of holding members 3 and 3 is set to be close to each other.

  The operation lever 5 is temporarily fixed at each position where the pair of holding members 3 and 3 are separated and close to each other, and the separated state and the close state of the pair of holding members 3 and 3 are maintained. Thus, the fixing means 6 is provided in order to temporarily fix the operation lever 5. In the fixing means 6, a plurality of locking grooves 61 a, 61 a,. The locking member 61 is formed in a plate shape. Further, at least two locking grooves 61a, 61a,... Are formed and locked at positions corresponding to the separated state and the close state of the pair of holding members 3 and 3, respectively.

  Then, the pair of holding members 3 and 3 are temporarily fixed in a separated state, which can be easily performed when the work carriage of the present invention is attached to or removed from the flange 91 of the beam-like material 9 from above. (See Figure 4). Further, when the pair of holding members 3 and 3 are temporarily fixed in the proximity state, the working carriage of the present invention can be attached to the flange 91 so that the working carriage does not come off the flange 91.

  The locking member 61 is fixed to the vertical frame member 11b constituting the main frame 11 of the base 1 by welding or a bolt nut (see FIG. 2). The operation shaft portion 51 of the operation lever 5 is always in a state of being locked to any of the locking grooves 61a, 61a,..., And from the locking groove 61a that locks the handshake portion 52 of the operation lever 5. It can be removed and moved to another locking groove 61a, and the separation or proximity state of the pair of holding members 3 and 3 can be selected.

  By providing three or more of the locking grooves 61a, 61a,..., It is possible to cope with the flange 91 in the beam-shaped material 9 of various sizes. Therefore, the depth of the locking groove 61a is removed from the locking groove 61a in which the operation shaft portion 51 is locked by elastically deforming the operation shaft portion 51 by the operation of the construction worker. While moving to the position of the groove 61a, it is set within a range where it can be inserted and locked in the locking groove 61a by elastic restoring force.

  Further, as another embodiment of the fixing means 6, there is one constituted by a locking member 61, an attachment portion 62, and a pivotal support portion 63 [see FIGS. 2B to 2E]. In this embodiment, the locking member 61 is configured to swing with respect to the mounting portion 62 via the pivotal support portion 63 (see FIGS. 2B, 2D, and 2E). The mounting portion 62 is fixed to the vertical frame member 11b of the main frame 11 by welding or bolts / nuts.

  The locking member 61 is configured to be swingable on the main frame 11, and by swinging the locking member 61 to be in a vertical shape, the operation shaft portion 51 of the operation lever 5 can be locked to the locking member. It is not locked to any of the locking grooves 61a, 61a,... 61, and is in a swingable state (see FIG. 2E). Then, when the positions of the pair of holding members 3, 3 are determined by the operation of the operation lever 5, the original locking grooves 61 a, 61 a,. The operation lever 5 can be temporarily fixed by tilting it to the state [see FIG. 2D].

  Further, as an embodiment of the swing mechanism 4, although not particularly shown, the pair of holding members 3, 3 are provided with links, one of both links is formed with a long hole, and the other link. Is provided with a pivot pin, and the pivot pin is inserted into the elongated hole. As a result, the pair of holding members 3 and 3 can simultaneously swing in the left-right symmetric state via the respective links.

  Next, the process of installing the working carriage of the present invention on the flange 91 of the beam 9 will be described. First, the construction worker swings the operation lever 5 of the work carriage to separate the pair of holding members 3 and 3 on the front side and the back side on both sides in the longitudinal direction of the base 1 as much as possible. The distance between the pair of holding members 3 and 3 is set to be larger than the width-direction dimension of the flange 91 (see FIG. 4A). The operation lever 5 is temporarily fixed by the fixing means 6 in this state. In this state, the work carriage is placed on the flange 91 of the beam member 9, and the wheel 21 of the traveling member 2 comes into contact with the flange 91.

  In this state, the operation lever 5 is swung to bring the pair of holding members 3 and 3 on both sides in the longitudinal direction of the base 1 close to each other. As a result, the rolls 31 and 31 mounted on the pair of holding members 3 and 3 are inclined in a substantially reverse “C” shape and come into contact with the flange 91 from the lower side at both ends in the width direction. The flange 91 is configured to hold both sides in the width direction from below (see FIGS. 2A, 3A, 4B, etc.).

  That is, the work carriage is installed on the upper surface side of the flange 91 of the beam-like material 9 by the traveling members 2, 2,..., And the lower surface side of the flange 91 is placed on the rolls 31, 31 of all the holding members 3, 3,. ,... Are brought into contact and pressed. As a result, the flange 91 is held from both sides in the vertical direction by the traveling members 2, 2,... Of the work carriage and the rolls 31, 31, and the work carriage falls off on the flange 91 of the beam-like material 9. Without being able to move in a very stable and safe state.

  Then, as shown in FIG. 5, the construction worker can sit on the pedestal 13 of the base 1 and move forward or backward by kicking the beam-like material 9 backward or forward with his / her foot. At this time, the working cart and the construction worker may work by connecting to a safety rope provided at the construction site via a lifeline.

DESCRIPTION OF SYMBOLS 1 ... Base, 21 ... Wheel, 2 ... Running member, 31 ... Roll, 3 ... Holding member,
DESCRIPTION OF SYMBOLS 4 ... Swing mechanism, 41 ... Gear, 5 ... Operation lever, 6 ... Fixing means, 61 ... Locking member,
61a ... locking groove, 62 ... mounting portion, 63 ... pivotal support, 9 ... beam-like material, 91 ... flange.

Claims (5)

  In a working carriage that can move on a flange of a beam-shaped material such as an H-shaped steel or an I-shaped steel, a base on which an operator can sit, and a base that is provided on both sides in the longitudinal direction of the base and placed on the flange And a pair of left and right holding members having cylindrical rolls provided on both sides in the longitudinal direction of the base and holding both sides in the width direction of the flange of the beam-like material from the lower surface side. A swing mechanism for swinging the pair of left and right holding members on both sides in the longitudinal direction of the base, an operation lever for operating the swing mechanism, and a fixing means for fixing the operation lever at a predetermined position; And a pair of left and right holding members on both sides in the front longitudinal direction of the base are simultaneously swung to be separated and close to each other by swinging the operation lever. Use the truck.   2. The work carriage according to claim 1, wherein the roll of the holding member is orthogonal to the longitudinal direction of the flange and is inclined with respect to a flat surface of the flange.   3. The work carriage according to claim 1, further comprising locking means for locking and fixing at a plurality of positions within a swing range of the operation lever.   4. The locking means according to claim 3, wherein the locking means includes a locking member having a plurality of locking grooves, an attachment portion that is fixed to the base, and a pivot portion that the locking member member swings. A working carriage characterized in that the operation lever can be swung by swinging the member.   5. The swing mechanism according to claim 1, wherein the same gear is fixed to each of the holding members, and both the gears mesh with each other to rotate both gears. Thus, the working carriage is characterized in that both the holding members swing in a symmetrical state.

Images