JP4665016B2 - Brake control lever structure - Google Patents

Description

  The present invention relates to a brake operation lever structure.

2. Description of the Related Art Conventionally, as described in Patent Document 1, there has been known one capable of adjusting the speed of a handcart by braking a wheel by grasping a brake lever member.
JP 2006-288867 A

  However, when the user leans on the wheelbarrow like a cane or when loading or unloading a load on the wheelbarrow, the user always operates the lever member to keep the wheel stopped (keep gripping). ) Or there is a problem that it is necessary to operate a separate parking lever.

  Then, this invention aims at provision of the brake operation lever structure which can lock a lever member in the state which stopped the wheel.

  In order to achieve the above object, a brake operating lever structure according to the present invention includes a casing fixed to a handle rod, an interior of the casing and an upper end pivotally pivoted about a horizontal axis, and a lower end. A swing piece with a brake wire attached to it and a guide hole formed in the middle between the upper and lower sides and a pin inserted into the guide hole of the swing piece are fixed, and the swing is performed by inserting the pin and the guide hole. A lever member connected to the piece, the lever member abutting on the upper concave portion in the casing to form an upper fulcrum that swings upward from the non-braking state, and an inner portion of the casing. A lower convex portion that contacts the lower concave portion and forms a lower fulcrum that swings downward from the non-braking state, and the guide hole is moved upward by the pin about the upper fulcrum The swing piece is By the pin moves downward about the lower pivot so as to form to pull the Kiwaiya in which the swinging piece is formed to be held in a position pulled the brake wire.

  According to the brake operation lever structure of the present invention, a single lever member can perform a brake operation capable of adjusting the braking force applied to the wheel and a lock operation for fixing the wheel. Brake operation and lock operation can be switched quickly.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 shows an embodiment of the brake operation lever structure of the present invention. FIG. 2 is an enlarged view of the main part. Reference numeral 40 denotes a shopping cart, which has a pair of left and right front wheels 43, 43 at the lower end and a pair of left and right front legs 41 having a pipe-like handle bar 1 at the upper end. A rear leg member 42 having rear wheels 44, 44 is pivotally attached so as to be foldable in the front-rear direction. Further, a front loading platform 45 pivotally attached to the front leg rod 41 so as to swing up and down and a rear loading platform 46 pivotally attached to the rear leg member 42 so as to be able to swing up and down can be approached and separated in the front-rear direction. The guide shaft 47 is connected. A storage bag 48 (shown by a two-dot chain line) is provided on the front and rear cargo beds 45 and 46.

A brake operating lever structure for operating the brake wire 2 is provided on the handle bar 1. Further, a braking device 50 capable of braking the rear wheels 44 and 44 by a pulling operation of the brake wire 2 (hereinafter sometimes referred to as the wire 2) is provided in the vicinity of the pair of left and right rear wheels 44 and 44. The wire 2 is pulled in one direction (arrow Y direction) of the axis L ₀ of the distal end portion 1a of the handle rod 1 so that the swing brake member 51 of the braking device 50 contacts the outer peripheral surface of the rear wheel 44, The rear wheels 44 are provided so as to be braked. Further, it is always pulled in the opposite direction of the arrow Y by a force-saving elastic biasing member. In the present invention, for ease of explanation, explanation will be made with the posture in which the axis L ₀ coincides with the traveling direction. The arrow Y direction may be referred to as the backward direction, and the direction opposite to the arrow Y may be referred to as the forward direction. The lower side is the ground side. In addition, a force in which the wire 2 is always pulled in the direction opposite to the arrow Y by a not-shown bullet urging member may be referred to as a restoring force.

  The brake operation lever structure includes a resin casing 10 fixed to the handle bar 1. The casing 10 has a cylindrical portion 13 that is fixed in the vicinity of the grip 9 that is externally fitted and fixed to the distal end portion 1 a of the handle rod 1. A case portion 15 is provided at the upper and lower intermediate portions. A wire holding portion 14 for holding the covering portion of the wire 2 is provided at the lower end portion.

  The case portion 15 forms a slit portion 15a having an upper opening shape. An opening 15b is formed on the arrow Y direction side (rear side). The inner wall on the opposite side (front side) is formed in a wave shape, and forms an arcuate (curved) upper recess 11 and an arcuate (curved) lower recess 12.

Further, a resin-made rocking piece 20 provided in the casing 10 is provided. The swing piece 20 is formed in an arc shape. The upper end 21 is inserted into the handle rod 1 through the slit portion 15 a of the case portion 15 and the cutout portion 1 b of the handle rod 1. The upper end 21 is rotated around the horizontal axis L ₁ inside the handle し た 1 in which the cylindrical portion 13 of the casing 10 is fitted by a pivot pin 16 that inserts the cylindrical portion 13 of the casing 10 and the handle 杆 1 like a skewer. It is pivotally attached to the rocker.

A wire 2 is attached to the lower end 22 of the swing piece 20. The swing piece 20 pulls the wire 2 by swinging in the arrow Y direction.
A guide hole 24 is provided in the middle of the swing piece 20 (between the upper end 21 and the lower end 22). The guide hole 24 includes a first locking portion 24A in which the pin 33 can enter near the upper end 21, a second locking portion 24B in which the pin 33 can enter below and forward of the first locking portion 24A, And a bulging portion 24C that protrudes in the direction in which the wire 2 is constantly urged and biased (the direction opposite to the arrow Y). The bulging portion 24C is disposed closer to the second locking portion 24B. It can be said that the guide hole 24 is formed in a crank shape.

Further, a resin lever member 30 having a storage space 35 through which the swing piece 20 can be inserted in the vertical direction is provided. Lever member 30 is fixed to the metal pin 33 penetrating the guide hole 24 of the receiving space 35 and the swinging piece 20 in the horizontal axis L ₁ direction. That is, the lever member 30 has a pin 33 inserted into the guide hole 24 fixed thereto, and is connected to the swing piece 20 by being inserted into the guide hole 24. The swing piece 20 can be operated (swinged) via the pin 33.

  The lever member 30 is inserted into the casing 10 in the direction opposite to the arrow Y (front side). On the arrow Y direction side (rear side), an annular grip portion 34 that the user can grip with the grip 9 is formed.

As shown in FIG. 2, the lever member 30 pulls the grip portion 34 toward the axis L _{0 as} shown in FIG. 3 from the non-braking state in which the wire 2 is not pulled to operate the braking device 50. when swung upward (when holding the grip portion 34 with the grip 9), in contact with the upper recess 11 of the casing 10, to form the fulcrum P ₁ on the swing of the lever member 30 to its upper It has an arcuate (curved) upper projection 31. The upper fulcrum P ₁ refers to the central portion where the upper convex portion 31 is in contact with the upper concave portion 11.

  In FIG. 3, the guide hole 24 is formed so that the swing piece 20 pulls the wire 2 by a pin 33 that moves upward together with the lever member 30.

The guide hole 24, the pin 33 to move around the upper pivot P ₁ is formed so as to enter the first locking portion 24A. The first locking portion 24A has a contact surface 24a that abuts the pin 33 and swings the wire 2 so as to pull in the arrow Y direction. The contact surface 24a, are formed in the upper movement arrow K ₁ direction. In other words, the contact surface 24a is formed on the upward movement trajectory of the pin 33 upward.

  The contact surface 24a restores the wire 2 when the user (operator) moves the gripping portion 34 away from a state in which the gripping portion 34 is approaching the grip 9 (the gripping portion 34 is gripped with the grip 9). It is also a surface that transmits the force by which the swing piece 20 is pulled back by force to the lever member 30 via the pin 33.

Further, as shown in FIG. 4, when the gripping portion 34 is swung downward so as to be separated from the axis L ₀ from the non-braking state of FIG. 2, it comes into contact with the lower recess 12 of the casing 10. The lower convex part 32 of the circular arc shape (curved shape) that forms the lower fulcrum P ₂ that swings downward is provided. The lower fulcrum P ₂ refers to the central portion where the lower convex portion 32 is in contact with the lower concave portion 12.

In FIG. 4, the second locking of the guide hole 24 so that the swing piece 20 pulls the wire 2 in the arrow Y direction by the pin 33 moving downward in the arrow K ₂ direction about the lower fulcrum P _2. A portion 24B and a bulging portion 24C are formed.
The guide hole 24, when the grip portion 34 of the lever member 30 swings to a predetermined pivot angle alpha, the pin 33 moves from the first locking portion 24A around the lower support point P ₂ rides over the bulge portion 24C It is formed as follows. The pin 33 is formed so as to be guided (entered) by the second locking portion 24B when it swings to a predetermined angle θ larger than the predetermined swing angle α.

The “angle” of the predetermined angle θ and the predetermined swing angle α is an angle between the axis L ₀ and the upper surface 30a of the gripping portion 34 of the lever member 30 that swings around the lower fulcrum P ₂ as a fulcrum.

  Further, the guide hole 24 is formed so that even if the pin 33 receives the restoring force of the wire 2 in a state where the pin 33 enters the second locking portion 24B, the guide hole 24 gets over the bulging portion 24C and does not escape upward. is doing. The bulging portion 24C is formed so as to transmit a restoring force to the lower convex portion 32 via the pin 33.

The use method (action) of the brake operating lever structure of the present invention described above will be described.
When the user walks by pushing the wheelbarrow 40 and wants to adjust the speed of the wheelbarrow 40 on a downhill or the like, or to stop it, the grip portion 34 of the lever member 30 is moved closer to the axis L _0. Grip with the grip 9.

Then, as shown in FIG. 3, the swing piece 20 swings from the position of the non-braking state indicated by the two-dot chain line. That is, the upper convex portion 31 of the lever member 30 abuts on the upper concave portion 11 of the casing 10 to form the upper fulcrum P ₁ , and the pin 33 is moved upward about the upper fulcrum P ₁ (in the upward movement arrow K ₁ direction). ). The pin 33 contacts the contact surface 24a of the first locking portion 24A and swings the swing piece 20 upward.

  The swing piece 20 pulls the wire 2 in the arrow Y direction, operates the braking device 50, brakes the rotation of the rear wheel 44, and tries to stop the handcart 40.

  When the force of the user holding the grip portion 34 together with the grip 9 is weakened, the swing piece 20 is pulled back by the restoring force of the wire 2. The contact surface 24 a of the swing piece 20 abuts on the pin 33, and the lever member 30 is swung together with the swing piece 20. The tensile force of the wire 2 is adjusted. The braking force is adjusted, and the speed of the handcart 40 is adjusted.

  When the user releases the grip portion 34 that the user grips with the grip 9, the swing piece 20 is pulled back by the restoring force of the wire 2. The lever member 30 returns to the non-braking state.

Then, the user, or if you want to lean the wheelbarrow 40 to rest, when the luggage of unloading such like to maintain the vehicle stop state of the pushcart, as shown in FIG. 4, the lever member from the axis L ₀ 30 is swung downward to a predetermined angle θ.

When swung to a predetermined angle theta, the lever member 30, the lower recess 12 of the casing 10, are brought into contact with the lower protrusions 32, forms a lower supporting point P _2. The pin 33 downward around the lower support point P ₂ is moved (down movement arrow K ₂ direction). When the lever member 30 has a predetermined swing angle α as indicated by a two-dot chain line, the pin 33 in the guide hole 24 gets over the bulging portion 24C.

  When the gripping portion 34 of the lever member 30 passes through the predetermined swing angle α and swings to the predetermined angle θ, the pin 33 enters the second locking portion 24B. The swinging piece 20 in the non-braking state indicated by a two-dot chain line is swung from the position to the upper position. The swing piece 20 pulls the wire 2 in the direction of the arrow Y and operates the braking device 50. The rotation of the rear wheel 44 is braked, and the wheelbarrow 40 is stopped.

When the user releases the grip portion 34, the swing piece 20 receives the restoring force of the wire 2 (force in the direction opposite to the arrow Y). The swing piece 20 transmits a restoring force to the pin 33. The pin 33 is restricted from moving upward (escape) by the bulging portion 24 </ b> C, and transmits a restoring force to the lever member 30. Lever member 30 supports a restoring force under the fulcrum P _2. The bulging portion 24C presses the lever member 30 against the casing 10 via the pin 33 (the lower convex portion 32 of the lever member 30 is pressed against the lower concave portion 12 using the restoring force), whereby the lever member The 30 position is held (locked). By providing the bulging portion 24C, the locked state of the lever member 30 is prevented from being released against the intention of the user (by a weak force such as vibration or slight contact).

  The lever member 30 oscillated to a predetermined angle θ holds the oscillating piece 20 at the position where the oscillating piece 20 is oscillated upward (the position where the brake wire 2 is pulled). The braking of the rear wheel 44 by the braking device 50 is maintained. In other words, a locked state in which the rotation of the rear wheel 44 is prohibited is set. Acts as a parking brake.

  When the user swings the lever member 30 upward so as to pass the predetermined swing angle α from the predetermined angle θ, the pin 33 gets over the bulging portion 24C. The swing piece 20 is pulled back. The lever member 30 returns to the non-braking state. The locked state (parking state) is released.

The lever member 30 swings in a direction (upward) to approach the axis L ₀ from the non-braking state, thereby enabling a normal braking operation that can brake the wheel to be braked (rear wheel 44). By swinging in a direction (downward) away from the axis L ₀ , a parking brake is applied to constantly brake the wheel to be braked (rear wheel 44) (to bring the brake into a locked state).

In the present invention, the design can be changed. For example, the handle L may be provided on the handle rod 1 whose axis L ₀ coincides with the vertical direction. Further, the shaft center L ₀ may be provided on the handle rod 1 in which the axis direction coincides with the left-right direction, not the traveling direction. The braking device 50 may be any device that can brake the wheel by pulling the brake wire 2. The wheel to be braked may be the front wheel 43.

As described above, the casing 10 fixed to the handle bar 1, the upper end 21 that is housed in the casing 10 is pivotally mounted around the horizontal axis L ₁ , and the brake wire 2 is attached to the lower end 22. Further, the swing piece 20 having a guide hole 24 formed between the upper and lower sides and the pin 33 inserted into the guide hole 24 of the swing piece 20 are fixed, and the pin 33 and the guide hole 24 are inserted into the swing piece 20. An upper convex portion 31 that forms an upper fulcrum P ₁ that oscillates upward from the non-braking state by contacting the upper concave portion 11 in the casing 10 and the casing. 10 and a lower convex portion 32 that forms a lower fulcrum P ₂ that oscillates downward from the non-braking state by contacting the lower concave portion 12 in the guide hole 24 with the upper fulcrum P ₁ at the center. As a result, the rocking piece 20 is formed to pull the brake wire 2 by the pin 33 moved upward as shown in FIG. _{Since the} rocking piece 20 is formed so as to be held at the position where the brake wire 2 is pulled by the pin 33 that has moved downward about the pin 2, the brake operation that can adjust the braking force to the wheel with one lever member 30 And a locking operation for fixing the wheel. The brake operation state and the lock state can be quickly switched. The number of parts can be reduced, and assembly can be easily performed.

It is a side view which shows the 1st Embodiment of this invention. It is principal part sectional drawing. It is principal part sectional drawing. It is principal part sectional drawing.

Explanation of symbols

1 Handle 杆 2 Brake wire (wire)
10 Casing
11 Upper recess
12 Lower recess
20 Oscillating piece
21 Top
22 Bottom
24 Guide hole
30 Lever member
31 Upper convex part
32 Lower convex part
33 pin L ₁ horizontal axis P ₁ upper fulcrum P ₂ lower fulcrum

Claims (1)

A casing (10) fixed to the handle rod (1), and an upper end (21) which is built in the casing (10) are pivotally mounted around a horizontal axis (L ₁ ) and are pivotally attached to the lower end (22 ) With a brake wire (2) attached and a guide hole (24) formed between the upper and lower sides, and a pin inserted into the guide hole (24) of the swing piece (20) A lever member (30) fixed to the pin (33) and connected to the swing piece (20) by insertion of the guide hole (24);
The lever member (30) is in contact with the upper concave portion (11) in the casing (10) and forms an upper fulcrum (P ₁ ) swinging upward from the non-braking state, A lower convex portion (32) that forms a lower fulcrum (P ₂ ) that swings downward from the non-braking state in contact with the lower concave portion (12) in the casing (10),
The with the guide hole (24), the upper support point (P ₁₎ the swinging piece by said pin (33) which has moved upward as the center (20) is formed to pull the brake wire (2) brake, characterized in that the swinging piece by the lower support point (P ₂₎ the pin (33) which has moved downward about a (20) is formed to be held in a position pulled the brake wire (2) Operation lever structure.

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