JP5002487B2 - Handcart - Google Patents

Description

  The present invention relates to a hand cart.

  Various brake devices have been proposed for braking a wheel that supports a loading platform having a U-shaped operation handle at the rear end, but generally speaking, a regulating material such as a brake shoe is provided on the tread of the wheel. (For example, Patent Document 1) and a structure in which a locking hole is provided in the wheel of the wheel along the axis of the axle and a restriction rod is engaged with the locking hole (for example, Patent It is roughly divided into the literature 2).

Japanese Utility Model Publication No. 7-31560 Japanese Patent Laid-Open No. 9-207786

  In the conventional example, the former structure (Patent Document 1) has a restrictive material in contact with the wheel tread, and restricts the movement of the wheel by strengthening the contact force. When this occurs, the rotational force may win over the contact force and wheel braking may not be possible, and even on flat roads, it may take a considerable amount of time for the wheel to receive braking. is there.

  The latter structure (Patent Document 2) can avoid the former name defect of the former, and, unlike the former, which has a possibility of rolling with reduced frictional resistance when in a braking state. However, it has the advantage of reliably controlling the rolling of the wheel, but the rolling of the wheel is stopped suddenly. There may not be.

  The present invention has been devised for the purpose of providing a hand-carried vehicle that is equipped with a brake device that can freely brake a wheel and that is easy to use.

In the push cart provided with a free caster on the front end side of the loading platform and a pair of fixed casters on the rear end side of a U-shaped handle frame composed of a handle rod and side rods on both sides thereof, the fixed caster provided in the wheel of the wheel, a regulating lever that releases engagement of the locking hole along the axis of the axle, provided with braking members approaching and moving away from the tread surface of the wheel, rearward to the top of side beams of said handle frame A drive that protrudes a part, supports the first support shaft and the second support shaft in a freely rotating manner, and removes the restricting rod from the locking hole against a spring bias. A brake handle is disposed on the inner side of the handle frame, further biased toward one of the wheels, and pressed against the first support shaft, and the brake piece pressed against the tread surface of the wheel against spring bias. in the inside of the handle frame, moreover in the second support shaft so as to be biased to the other of the wheel-side, it Is it to a structure attached to a position that can be squeezing simultaneously by the handle rod and the fingertip.

  When the transport vehicle is stored, the restriction rod engages with the wheel through-hole to reliably restrict the rolling of the wheel, and when in use, the drive handle removes the restriction rod from the through-hole and operates the brake handle to The wheel can be braked by gradually pressing it against the wheel tread, and the operation to stop suddenly as needed and the operation to stop while reducing the speed can be selectively performed reliably, and the stopped state is reliably maintained. A hand cart can be provided.

  FIG. 1 is a partially cutaway front view, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. FIG. 5 is a partially omitted enlarged view of FIG. 3, FIG. 7 is a partially omitted plan view of FIG. 4, and FIG. FIG. 5 is a partially cutaway plan view of FIG. 4 in a traveling state.

  In the figure, 1 is a loading platform, and the loading platform 1 is provided with a free caster 2 on the front end side and a fixed caster 3 on the rear end side where a handle frame 25 is erected, and the fixed caster 3 is a wheel fixed to the lower surface of the loading platform 1. A wheel 6 is rotatably attached to the frame 4 by an axle 5 that is passed to the side pieces 4a, 4a of the wheel frame 4.

The hand cart A of the embodiment engages the restriction rod 8 by the urging force of the coil spring 21 in the locking hole 7 provided in the wheel 6 to restrict the rolling of the wheel 6, A stop device for reliably maintaining the stop state, and a brake pin (corresponding to a brake piece in claims) 33 provided at the tip of the brake frame 32 against the urging force of the tension spring 34 on the tread surface 6 'of the wheel 6 And a braking device that regulates the rolling of the wheel 6 to reduce and stop the rolling (running) speed of the wheel 6 and stop (depending on the running speed of the wheel 6). In the following description, the stop device and the brake device will be described separately.

About the Stop Device The wheel 6 of the fixed caster 3 arranged in parallel on the rear end side of the loading platform 1 is one side of the wheel 6a of the existing wheel body composed of a metal disc wheel 6a and tire rubber 6b arranged on the peripheral side thereof. A metal donut-shaped locking plate 6c is overlapped and attached to the outer surface of the disk wheel 6a so that the locking plate 6c has a concentric circle centered on the axle 5. A large number of locking holes 7 (the same diameter as each other) are arranged at substantially equal intervals on the upper side so that the restriction rod 8 is engaged with or separated from the arbitrary locking hole 7.

The device base frame 9 fixed to the side piece 4a (wheel frame 4) on the side opposite to the locking plate 6c is configured by projecting the upper and lower pieces 9b, 9c side by side on the base piece 9a. It is composed of a frame, and a base piece 9a is overlapped with the side piece 4a and welded and fixed. Between the upper and lower pieces 9b and 9c of the apparatus base frame 9, the pieces 9b and 9c are free. A pair of working pieces 12 are stacked one above the other through a spacer cylinder 11 that is fixedly attached to one end side with a support shaft 10 interposed therebetween, and is freely rotatable. Is assembled.

  The working piece 12 is an L-shaped piece composed of a pair of pieces 12a and 12b arranged in a direction orthogonal to each other, and the front end of one piece 12a is provided on the upper and lower pieces 9b and 9c. It is attached to the connecting shaft 14 that moves along the long hole 13 that is long in the moving direction, and is connected by the second connecting shaft 15 with the base piece 8b of the restriction rod 8 interposed between the other pieces 12b, 12b. It is.

  The restriction rod 8 is configured by projecting a round bar-shaped main body rod 8 a at one end of the ring-shaped base piece 8 b penetrating the second connection shaft 15, and the main body rod 8 a is configured as the base piece of the device base frame 9. 9a and through the through holes 16 and 17 provided in the side piece 4a of the wheel frame 4 that overlaps with the piece 9a, as described above, the arbitrary locking hole 7 is engaged and disengaged. This is performed in accordance with the movement of the connecting shaft 14 along 13.

  The upper and lower ends of the connecting shaft 14 engage with the long hole 13 to connect the one piece 12 a of the operating piece 12 to the device base frame 9 at the upper and lower pieces 9 b and 9 c and project from the long hole 13. The upper and lower ends are fixed to the moving member 18, and the inside of the long hole 13 is moved back and forth according to the movement of the moving member 18.

  The moving member 18 passes through the operating pieces 12 and 12 and the upper and lower pieces 9b and 9c of the device base frame 9 and passes to the upper and lower pieces 18a 'and 18a' to be attached to the center of the body frame 18a to which the connecting shaft 14 is attached. A pair of pieces 18b, 18b are arranged in a protruding manner on the rear surface of the piece 18a '', and a connecting pin 19 is passed to the tip (free end) of the pieces 18b, 18b so as to be rotatably supported. The connecting pin 19 is assembled with the arm piece 20a of the intermediate rod 20 interposed between the pieces 18b, 18b by external fitting, and one end of the coil spring 21 with one end locked to the wheel frame 4. The coil spring 21 is installed between the connecting pin 19 and the wheel frame 4 on the fixed side, and the connecting shaft 14 is forced to the front edge of the long hole 13 by the bias of the coil spring 21. Moving.

  The intermediary rod 20 is a side piece 4′a of an auxiliary frame 4 ′ assembled to the wheel frame 4 (the auxiliary frame 4 ′ is additionally assembled to the wheel frame 4 in order to use the existing wheel frame 4). , 4′a, and a lower piece 22a provided at the lower end of the first link rod 22 through the loading platform 1 with a second arm piece 20b projecting on the opposite side of the arm piece 20a. (In the embodiment, the pins protruding from the second arm piece 20b are passed through the lower piece 22a and assembled to each other by means of retaining such as caulking. And can be pivoted so that they can rotate freely).

  An upper piece 22b is provided at the upper end of the first link rod 22 existing on the loading platform 1, and the upper link 22b is pivotally attached to a first support shaft 27 provided with a drive handle 24 protruding therefrom. The drive handle 24 is pivotally attached to the lower piece 23b so as to be rotatable with respect to each other. The drive handle 24 has side flange portions 24b provided on both sides of the upper flange portion 24a, and is provided with a handle rod 25a on both sides of the handle rod 25a ( Leg) A portion provided inside the handle frame 25 that is provided with a flange 25b relative to the wheel frame 25 while being biased toward one wheel 6 and projecting rearwardly on the upper side rod 25b of the handle frame 25. The coil spring 21 is biased by projecting on the first support shaft 27 supported rotatably on the piece 25b ', and simultaneously gripping the handle rod 25a and the upper collar portion 24a of the handle frame 25 with a fingertip. Rotation operation centered on the first support shaft 27 is performed, and the restriction rod 8 is engaged with the locking hole. More disengaged, the stop state of the wheel 6 is released, the resulting running state.

  When the fingertip is released from the drive handle 24 in this traveling state (the state shown in FIG. 7), the connecting pin 19 is pulled and moved from the rear end side to the front end side by the action of the coil spring (return spring) 21. Since the connecting pin 19 is assembled to the moving member 18 at the piece 18b, the moving member 18 moves forward while being pressed by the connecting pin 19 (moves in the front end direction), and the device base frame 9 Since the operation piece 12 pivotally attached to the support shaft 10 is connected to the moving member 18 by the connection shaft 14 in the part 12a, the support shaft 14 is moved along with the movement of the connection shaft 14 along the guide long hole 13. As a result, the regulating rod 8 connected to the operating piece 12 at the piece 12b moves in the axial direction of the wheel 6 and engages with the locking hole 7 existing at the tip position to engage the wheel 6 The movement of the brake (the brake operation is performed That).

  When the upper collar portion 24a is gripped simultaneously with the handle collar 25a (in short, when the drive handle 24 is rotated around the shaft 27), the second link collar 22 rises and pivotally attaches to the second link collar 22. The first ring rod 23 also rises, and the first link rod 23 pulls the second arm piece 20b provided on the mediating rod 20 with the rise.

  The intermediate rod 20 is rotated by this pulling, and the connecting pin 19 is assembled to the other arm piece 20 a of the intermediate rod 20, so that the connecting pin 19 is opposite to the above against the bias of the coil spring 21. Moving in the direction (retracting from the front end to the rear end direction of the loading platform 1), the moving member 18 connected to the connecting pin 19 and the operating piece 12 are also returned to the original position, and the restriction rod 8 is detached from the locking hole 7, The rolling state of the wheel of FIG. 8 can be obtained from the wheel stop state of FIG.

  In the embodiment, the locking plate 6c is attached to both the fixed casters 3 and 3, and the restriction carriage 8 is locked to the locking hole 7 provided in the locking plate 6c to move the hand cart A. Although it is restricted, it is not necessarily inconvenient to restrict the rolling of only the wheel 6 of one fixed caster 3, but the movement of the wheels 6 and 6 of both fixed casters is restricted as in the embodiment. A more stable braking state can be obtained by restricting them simultaneously.

About the braking device The braking frame 32 having the braking pin 33 provided laterally is arranged on the inner side of the wheel frame 4 so that it can be rotated by the support shaft 37 at the intermediate portion between the side pieces 32b and 32b. It is pivotally attached.

  The brake frame 32 has one end of a brake pin 33 on the front end side projecting from one of the side piece 32b, and the other end of the tension spring 34 locked to the end is locked to the wheel frame 4. Thus, the urging force of the tension spring 34 rotates (swings) about the support shaft 37 so that the brake pin 33 is always located on the side of the wheel tread surface 6 ′.

A rear end portion of a central piece 32a interposed between the side pieces 32b and 32b of the brake frame 32 is extended to the rear of the wheel frame 4, and a screw portion 35a of the first series rod 35 and the screw An upper piece 35b is provided at the upper end of the first series of rods 35 existing on the loading platform 1 and connected to the first series of rods 35 by a connection nut 36 screwed into the portion 35a. The lower handle 40b of the second connecting rod 40 pivotally attached to the second support shaft 39 projecting from the first pivot 39 is pivotally attached to each other, and the brake handle 38 is provided on both sides of the upper collar portion 38a. It is formed by providing a flange 38b relative to each other, and is biased toward the other wheel 6 on the inner side of the handle frame 25 formed by providing a handle rod 25a and side (leg) rods 25b on both sides of the handle rod 25a. In a piece 25b 'projecting rearward from the upper side of the handle frame 25b of the handle frame 25, The second support shaft 39 that protrudes from the second support shaft 39 that is movably supported and resists the biasing force of the tension spring 34 by simultaneously grasping the handle rod 25a and the upper collar portion 38a of the handle frame 25 with a fingertip. A rotation operation about the shaft 39 is performed, and the braking pin 33 is pressed against the wheel tread surface 6 'to obtain a stopped (braking) state of the wheel 6.

Relationship between Stop Device and Braking Device When the hand cart A is not used, the restricting rod 8 engages with the locking hole 7 by the action of the coil spring 21 and the rolling of the wheel 6 is restricted in the stop device. The regulation state is maintained regardless of the release of the brake pin 33 from the wheel tread surface 6 ′ by the action of the tension spring 34.

  When the hand cart A is used, the driving handle 24 is operated to disengage the regulating rod 8 from the locking hole 7 against the bias of the coil spring 21, so that the rolling state of the wheel 6, that is, the transport vehicle A The running state can be obtained. During the running state, the operation of the drive handle 24 (the operation of grasping with the hand handle 25a together with the handle) is continuously performed (when stopped, the coil spring 21 is actuated so that the regulating rod 8 is engaged with the locking hole 7). The brake handle 38 is rotated against the urging force of the tension spring 34 (when the grip pin 25a is gripped with the hand) as necessary. When the wheel 6 is braked by bringing it into contact with the wheel tread 6 'or intermittently contacting it, and the traveling speed of the transport vehicle A (the rolling speed of the wheel 6) is moderate, the drive handle 24 Stop again by releasing It is that obtained the state.

Partially missing front view. The partially expanded view of FIG. The right view of FIG. The other partially enlarged view of FIG. FIG. 5 is a partially omitted view of FIG. 4. FIG. 4 is an enlarged view of a part of FIG. FIG. 5 is a partially cutaway plan view of FIG. 4. FIG. 5 is a partially cutaway plan view of FIG. 4 in a traveling state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loading platform 5 Axle 6 Wheel 6a Wheel 6 'Tread surface 7 Locking hole 8 Control rod 24 Drive handle 25 Handle frame 33 Brake piece 38 Brake handle

Claims (1)

In the push cart provided with a free caster on the front end side of the loading platform and a pair of fixed casters on the rear end side of a U-shaped handle frame composed of a handle rod and side rods on both sides thereof, the fixed caster provided in the wheel of the wheel, a regulating lever that releases engagement of the locking hole along the axis of the axle, provided with braking members approaching and moving away from the tread surface of the wheel, rearward to the top of side beams of said handle frame A drive that protrudes a part, supports the first support shaft and the second support shaft in a freely rotating manner, and removes the restricting rod from the locking hole against a spring bias. A brake handle is disposed on the inner side of the handle frame, further biased toward one of the wheels, and pressed against the first support shaft, and the brake piece pressed against the tread surface of the wheel against spring bias. in the inside of the handle frame, moreover in the second support shaft so as to be biased to the other of the wheel-side, it It is attached to a position that can be squeezing simultaneously by the handle rod and the fingertip, the cart.

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