JPS6218927B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to link tensioners. Particularly in the case of a foot brake (human-operated type) link device, it is common to adjust the tension of the link mechanism once during maintenance. A setting often set for this purpose is a tension of 600 lbs (27·2.1552 kg), which ensures that the linkage is uniformly preloaded at all times. Tensioning techniques are known in the art and typically use conventional equipment. However, they are cumbersome to use and require the operator to carefully read them using a tensiometer. This also requires the operator to be very careful in adjusting the tension to the desired value.
There is also a risk that the tension meter may be inaccurate.

The purpose of the present invention is to increase the link tension so that the tension exceeding the set value is lengthened to eliminate the excess force from the set value, and then the extension stops, thereby setting the tension of the device to the predetermined set value. It is to provide Jonah. This is done in one operation, and by paying attention to the quality of the tensioner during manufacture rather than the operator's care or judgment, the tension adjustment operation of the linkage device can be easily and accurately performed.

The link tensioner of the present invention has a rigid body having a pair of flexure devices that define a curved path along the rigid body. A rigid bendable elongated rod extends along this curved path. A first attachment device is provided for connecting the rod to the linkage and a second attachment device is provided for connecting the body to the linkage. A link tensioner connected to the linkage forms part of the linkage, and a tension above the setpoint bends the rod and pulls it along the path, thereby increasing the tension in the linkage to the setpoint. The tensioner is lengthened until the tension reaches the set value, thereby setting the tension in the link mechanism to the set value.

In a preferred embodiment of the invention, the rod is curved into a U-shape forming a curve with a pair of legs. A first attachment device is attached to one of the legs and a first bending device is positioned within the bend to retain the rod in the body. Another bending device provides support for the other leg. This allows the two bending devices to maintain the shape of the passageway.

These and other patents of the invention will become apparent from the following description and drawings.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows a pair of brakes 11 on the rear wheels of a car,
12 shows a brake device 10 schematically showing 12; Yoke 13 receives the ends of cables 14, 15 which are connected to brakes 11, 12, respectively. A return spring 16 is connected to the vehicle frame 17;
The device shown in Figure 1 is repelled to the right.

A brake pedal 20 is pivotally supported on the frame. When a force is applied by foot or hand as indicated by arrow 21, the device is placed in tension and the brake is applied. The link connects the brake pedal 20 to the brakes 11, 12 through the yoke 13. This link consists of cable 22, yoke 13 and cables 14,15. Sheave 23 is shown as a guide often used in brake systems. The link is completed by a link tensioner forming part of the link.

This tensioner has a substantially clevis-shaped main body 26 consisting of a clevis base 27 and arms 28 and 29. The arms 28, 29 have shoulders 30, 31, respectively, with a channel 32 between the shoulders 30, 31 and the arms. This base 27 has a through hole 33 through which the shank of a head bolt 34 is inserted to retain its head. The yoke 13 is fitted onto this bolt 34 and is held in the threaded portion of the bolt 34 by a nut 35.

This body 26 has a first flexing device 36 fixed between arms 28, 29 and consisting of a pin 37 extending therebetween. It has an annular periphery 38. The second flexion device 39 is the shoulder 30,31.

A strong and bendable elongated rod 40 has a head 41 at one end, a curved portion 42 and a pair of arm portions 43,
It is bent into a U shape so as to have a diameter of 44. Arm 43 has a head 41 while arm 44 extends freely beyond the bend. The first flexion device holds the rod 40 by engaging its curvature, and the arm 44 is supported against the second flexion device.

The clip 45 has an elongated hole 46 whose wall engages the head 41. It also has a slot 47,
The head 48 of the cable 22 is thereby received. As can be seen from the foregoing, the link tensioner forms the link in the overall link system and the tension acts to pull the cable 22 and bolt 34.

The combination of the two bending devices constitutes a curved path 50, in this case U-shaped. If you pull this linkage with force, the rod will move along this axis along this path 50
trying to move above.

FIG. 5 shows another embodiment of the present invention, in which a main body 55 consists of a pair of plates 56, 57 connected by pins 58, 59, 60, 61. pins 58, 59
together form a first bending device 62, pins 60,
61 forms a second bending device 63. These pins 58, 59, 60, 61 each act as a guide allowing the passage of the rod 40. Rod 65 has similar physical characteristics to rod 40. The guides are offset from each other so that the first guide, consisting of a first bending device 62, causes a first bend 66 in the rod 65. the second bending device creates a second bend 67;
These bends are in opposite directions. As shown in the figure, the rod 65 of this link mechanism is connected to the mounting eye 6.
8, and the connection of the body 55 of this linkage is effected by a pin 69 and a mounting eye 70.

Figures 6 and 7 show that the cross section of the rod can be different. In FIG. 6, the rod 40 is of circular cross section. In FIG. 7, the rod 40 has a square cross section.

Other cross sections can also be selected instead of the above.

The pin is preferably made of steel, e.g.
1010 carbon steel, preferably phosphate treated to form an integral phosphate that retains oil or other lubricant to provide constant frictional action. Both body structures and flexure devices are similarly treated and lubricated to reduce fluctuations in the interacting parts. Preferably, the rod is annealed.

The force required to pull the rod through its bend will vary depending on the diameter, area and stiffness of the cross section. One skilled in the art can easily select the system variables to provide a predetermined tension by applying a tension to the link tensioner that is greater than its tension setting.

Next, the operation of this device will be explained.

Press the brake pedal to apply a tension greater than the set value to the link tensioner. Typical setting for brake adjustment is 600lbs
(272.1552Kg). This excess tension pulls the rod through the body of the linkage at a tension that substantially exceeds the set point force. When this happens, the tensioner escapes this force by allowing the rod to slide over its body. In this free relief condition, if the tension decreases below a set value of, for example, 600 lbs (272.1552 Kg), the slippage immediately stops and the linkage remains adjusted to the predetermined tension in the device. This surplus force in the linkage can be recognized by a skilled operator.

In the embodiment of Figures 1-4, the force is resisted first by the bending movement of the rod along its axis. Of course, there is some frictional resistance, but this is reduced as much as possible by improving surface lubrication.

In the embodiment of FIG. 5, the two curvatures create the same type of effect.

For a suitable rod-like body in this example, a suitable sized 600 lbs (272.1552 Kg) resistance is when the diameter of the rod is approximately 0.1915 inches (0.48641 cm) and the inside diameter of the bend is approximately 0.188 inches (0.47752 cm). . The material is fully annealed carbon steel 1010, preferably phosphate finished and oiled. This allows the present invention to provide a self-safe link tensioner with a predetermined set point at a predetermined maximum tension of the device.

The invention is not limited to the embodiments shown and described;
These are illustrative and not limiting of the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of one embodiment of the present invention, and FIG.
The figure is a top view of a part of FIG. 1, FIG. 3 is a side view of FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 3, and FIG. 6 and 7 are sectional views showing the used parts of the device portion of the present invention, and FIG. 8 is a top view of the portion shown in FIG. 5. 26, 55... Main body, 42, 66, 67... Curving, 36, 62... First bending device, 39, 63
...second bending device, 40,65...rod.

Claims (1)

[Scope of Claims] 1. A tension transmission system having a first attachment device and a second attachment device placed in tension, and a tension transmission system connecting the first and second attachment devices is a rigid body body. a pair of smooth bending devices defining a curved passage retained in the rigid body, and a pre-curved rigid bendable elongated rod having a connecting end, a free end and a smooth continuous outer surface. the longitudinal curvature of the rod conforms to the curved passageway, the rigid body and the bending device are in free, non-tight sliding contact with the rod, and the rod has a pair of legs and the rigid body. The rod is curved to form a curved portion extending along a curved path of the rod, and the tension required to deform the curvature of the rod and its rigidity depending on the dimensions and material properties is a predetermined value, and if the tension is less than the predetermined value, the rod is The rod deforms sequentially along the curved path and is not pulled, and when the tension exceeds the predetermined value, the rod deforms until the tension decreases to the predetermined value, limiting the maximum tension of the tension transmission system to the predetermined value. . The predetermined value is greater than a frictional force between the rod and the bending device of the body to allow the rod to move along the path. 2 The rod has a pair of legs and a U that forms a curved part.
the first attachment device is attached to one of the legs, the first of the bending devices being disposed within the bend to hold the rod to the body, and the other of the bending devices being attached to the leg. 2. A link tensioner according to claim 1, wherein the two bending devices maintain the shape of the passageway. 3. The link tensioner of claim 2, wherein the body is a clevis, the first bending device is a pin connected to the body across the clevis, and the second bending device is a shoulder of the clevis. . 4. The link tensioner according to claim 1, wherein the rod is made of steel and coated with a lubricating oil retaining layer. 5. The link tensioner of claim 4, wherein said layer is phosphate integral with steel. 6. The link tensioner of claim 1, wherein the first and second bending devices are guides made of staggered rigid bodies forming a pair of curvatures in the rod. 7. The link tensioner of claim 6, wherein the main body includes a pair of plates interconnected by the bending device. 8 A tension transmission system having a first attachment device and a second attachment device placed in tension, and a tension transmission system connecting the first and second attachment devices includes a clevis and a rigid body of the clevis. a pair of smooth bending devices forming a curved passage retained in a pre-curved rigid bendable elongated rod having a connecting end, a free end and a smooth continuous outer surface; A longitudinal curvature conforms to the curved passageway, the rigid body and the bending device are in free, non-tight sliding contact with the rod, and the rod fits into the curved passageway of the rigid body with a pair of legs. curved in a U-shape to form a curvature extending along the rod, the first flexing device being located inside the curvature to retain the rod in the body, and the second flexing device supporting and thereby said two flexure devices defining the shape of said passageway, the first flexion device being a pin connected to the clevis, the second flexion device being a shoulder in the clevis, and the second flexion device being a shoulder in the clevis; one of the rods is connected to the first attachment device for tensioning, and the rigid body is connected to a second attachment device to modify the curvature and rigidity of the rod due to its dimensions and material properties. The required tension is a predetermined value, and if the tension is less than the predetermined value, the rod will deform sequentially along its curved path and will not be pulled; if the tension is greater than the predetermined value, the rod will deform until the tension decreases to the predetermined value. to limit the maximum tension of the tension transmission system to the predetermined value, the predetermined value being greater than the frictional force between the rod and the bending device of the body, such that the rod can move along the path. The link tensioner described in item 1 of the scope.