JP6348356B2 - Wheelchair caster support fixing member - Google Patents

Description

  The present invention relates to a wheelchair caster support fixing member for attaching a caster used for a wheelchair.

  As a structure for attaching a caster to a main body frame constituting a wheelchair, for example, a cylindrical body is welded to a lower portion of the main body frame, and a plurality of dampers in which a rubber sleeve is interposed between the inner cylinder and the outer cylinder are provided in the cylindrical body. The caster pivot shaft is inserted into the inner cylinder of the damper, the caster pivot shaft is inserted into the damper, and the fixing nut is screwed into the male thread formed at the upper end of the caster pivot shaft so that the caster is attached to the cylindrical body. What was made into is known (for example, patent document 1). According to such a conventional configuration, since the rubber sleeve of the damper can absorb vibrations and impacts during running of the wheelchair, the feeling of use of the wheelchair can be improved.

JP 2008-6190 A

  By the way, in the above-described conventional configuration, in order to attach the caster to the main body frame of the wheelchair, in addition to the operation of welding the cylindrical body to the main body frame, the operation of press-fitting a plurality of dampers into the cylindrical body, and the cylinder The operation | work which inserts a caster turning shaft in the inner cylinder of the damper arrange | positioned in the body and fixes this caster turning shaft is required. As described above, the installation work of the caster requires many work processes, and the installation work requires a great deal of labor because the cylindrical body that is the work target is welded and fixed to the main frame having a large size. For this reason, in order to improve workability and reduce work costs, it is required to simplify work contents.

  Further, in the above-described conventional configuration, a plurality of dampers are press-fitted into a cylindrical body welded to the main body frame, and the caster turning shaft is inserted into the inner cylinder of each damper arranged in parallel in the vertical direction. Therefore, the damper is relatively high. Dimensional accuracy is required. If the dimensional accuracy of the damper is low, the contact part may become defective and wear may occur, or the center line of the inner cylinder of each damper may be displaced, and the caster turning shaft fixing structure may be rattled. Thus, the smooth running performance of the wheelchair may be reduced. For this reason, the damper has a limit in reducing the manufacturing cost in order to maintain the desired dimensional accuracy.

  The present invention proposes a caster support fixing member for a wheelchair that can improve the workability of the caster mounting work and can reduce the work cost and the manufacturing cost.

The present invention is a wheelchair caster support fixing member used for supporting and fixing a caster to a lower portion of a main body frame in a wheelchair, and a main body portion fixed to a lower portion of the main body frame via a consolidation mechanism; A cylindrical outer cylinder portion coupled to the main body portion, and a cylindrical shape that is disposed in the outer cylinder portion along the cylindrical direction of the outer cylinder portion and into which the caster turning shaft of the caster is inserted and fixed. An inner cylinder part; and a rubber elastic part that holds the inner cylinder part in the outer cylinder part by being interposed between the outer cylinder part and the inner cylinder part, and the main body part and the outer cylinder part the inner a cylindrical portion and the rubber elastic portion is constructed as a single piece with, the rubber elastic portion are respectively bonded to the outer cylinder part and the inner cylinder portion, the inner cylindrical portion the male threaded portion formed on an upper end portion of the insertion fixed caster pivot, is screwed fixing nut In Rukoto, which said caster pivot shaft is fixed to the inner cylinder portion, the upper and lower ends of the inner cylindrical portion, seat member having at least a large diameter outer diameter than the inner diameter of the outer cylindrical portion Is a wheelchair caster support fixing member.

  Here, the consolidating mechanism may be configured to consolidate the main body portion to the main body frame so as to be detachable, or may be configured to be solidified so as not to be removable.

Since this structure is a structure having a damper function by providing rubber elastic parts respectively bonded to the outer cylinder part and the inner cylinder part, the damper is a separate member as in the conventional structure described above. Is not required, and the press-fitting work of the damper is not required. That is, if the wheelchair caster support fixing member of the present invention is used, the work of attaching the caster to the body frame of the wheelchair can be simplified. Specifically, the wheelchair caster support fixing member is fixed to the main body frame by a fixing mechanism, and the caster turning shaft is inserted and fixed (for example, inserted) into the inner cylinder portion of the wheelchair caster support fixing member. It only requires the work of supporting and fixing. Therefore, the configuration of the present invention can reduce the work process of the caster mounting work as compared with the above-described conventional configuration, can improve the workability of the caster mounting work, and can reduce the work cost.

Furthermore, the caster support fixing member for a wheelchair according to the present invention has a damper function by the inner cylinder part, the rubber elastic part (damper part), and the outer cylinder part which are configured as an integrated object, and thus the conventional configuration described above. Unlike the above, a damper with high dimensional accuracy is not required. Therefore, the wheelchair caster support fixing member of the present invention can reduce the cost required for its manufacture as compared with the conventional configuration described above, and does not require skill in the assembly operation.

Further, as described above, the present invention is such that the fixing nut is screwed onto the male screw portion formed at the upper end portion of the caster turning shaft inserted and fixed to the inner cylinder portion, so that the caster turning shaft is in the inner portion. A configuration is adopted in which a receiving seat member having an outer diameter at least larger than the inner diameter of the outer cylinder portion is disposed at the upper end and the lower end of the inner cylinder portion . .

  According to such a configuration, the caster can be easily attached, and the operational effects of the present invention, that is, improvement of workability of the caster and reduction of work cost can be further improved. Further, even if the rubber elastic part deteriorates and the inner cylinder part moves up and down excessively with respect to the outer cylinder part, the seat member is moved when the inner cylinder part moves up and down. By coming into contact with the upper end or the lower end of the outer cylinder part, it is possible to prevent the caster from falling off or excessively entering the outer cylinder part.

  Since the wheelchair caster support fixing member of the present invention has a damper function as described above, it is possible to improve the workability of the caster mounting work and reduce the work cost as compared with the conventional configuration described above. it can.

1 is a side view of a wheelchair 1. FIG. It is the X section enlarged view of FIG. The caster support fixing member 21 is shown, (A) is a plan view, and (B) is a front view. The caster support fixing member 21 is shown, (A) is a side view, (B) is a longitudinal cross-sectional view. 3 is a partial cross-sectional view showing a state in which the caster support fixing member 21 is shown and attached to the base frame portion 11. It is a fragmentary sectional view which shows the state which showed the caster support fixing member 21 and the caster 51 was attached.

  Embodiments according to the present invention will be described in detail according to the following examples.

  As shown in FIG. 1, the wheelchair 1 includes a main body frame 10 formed of a metal pipe. The main body frame 10 includes a pair of left and right side frames. The side frame includes a base frame portion 11 formed in the front-rear direction, a rear leg frame portion 12 rising from the base frame portion 11, and the rear leg frame. The back frame part 13 extended upward from the part 12, and the seat frame part 15 extended from the upper end part of this back leg frame part 12 to the front substantially horizontally are provided.

  The rear leg frame portion 12 is provided with the rotating shaft portion 3 of the main wheel 2. Further, a handle portion 14 for an assistant to operate the wheelchair 1 is provided at the upper end of the back frame portion 13.

  Further, as shown in FIG. 2, a caster support fixing member 21 is attached to the front portion of the base frame portion 11, and a caster 51 is supported and fixed to the caster support fixing member 21. More specifically, the caster support fixing member 21 is attached to the left and right base frame portions 11 at symmetrical positions, and the caster 51 is supported and fixed to the caster support fixing members 21 arranged on the left and right. Yes. The caster support fixing member 21 is a wheelchair caster support fixing member according to the present invention.

Hereinafter, the caster support fixing member 21 will be described in detail.
As shown in FIGS. 3 and 4, the caster support fixing member 21 includes a main body portion 22 fixed to the base frame portion 11 and a cylindrical outer tube portion 23 coupled to the main body portion 22. The cylindrical inner cylinder part 24 is disposed in the outer cylinder part 23, and the rubber elastic part 25 is interposed between the outer cylinder part 23 and the inner cylinder part 24.

The main body 22, the outer cylinder part 23, the inner cylinder part 24, and the rubber elastic part 25 are configured as a single body , and the rubber elastic part 25 is a part of the outer cylinder part 23. It is thermally welded (adhered) to the inner peripheral surface and the outer peripheral surface of the inner cylindrical portion 24.

  Here, the inner cylinder part 24 is formed to be longer than the outer cylinder part 23, and the upper and lower ends thereof are arranged so as to protrude from the upper and lower ends of the outer cylinder part 23, respectively.

In the present embodiment, the main body 22 and the outer cylinder 23 are made of nylon resin (6, 6 nylon), and the inner cylinder 24 is a carbon steel pipe (STKM). It is formed by. The rubber elastic portion 25 is made of natural rubber (NR). Such structures are, for example, conventionally using known die casting methods can be configured as one piece, a detailed description thereof will be omitted.

  As shown in FIG. 4, the main body portion 22 of the caster support fixing member 21 has a substantially inverted U-shaped cross section, and a U-shaped groove 35 is formed along the lateral direction on the back side. The U-shaped groove 35 has a curved side surface and is in contact with the outer peripheral surface of the base frame portion 11 when attached to the base frame portion 11 (see FIG. 5). .

  Further, a pair of upper and lower first through holes 33a and 33b penetrating in the vertical direction are formed in the upper wall portion 31a and the lower wall portion 31b constituting the U-shaped groove 35. Specifically, the main body portion 22 is formed. The first through-holes 33a and 33b are respectively arranged on both sides in the horizontal direction. Further, as shown in FIG. 5, each upper wall portion 31a is formed with a protrusion 32a having a circular recess 34a communicating with the first through hole 33a.

  Similarly, a protrusion 32b having a recess 34b communicating with the first through hole 33b is formed on the lower wall portion 31b. These concave portions 34a and 34b serve as portions where bolt heads or nuts 43 of fastening bolts 42 to be described later are seated.

  In addition, the outer cylinder portion 23 is coupled to a substantially central position on the front side of the main body portion 22. The outer cylinder portion 23 is provided such that its cylinder direction is along the vertical direction.

  The inner cylinder part 24 is arranged at the substantially center inside the outer cylinder part 23 so that the cylinder direction is along the cylinder direction (vertical direction) of the outer cylinder part 23. The inner cylinder part 24 is held in the outer cylinder part 23 by a rubber elastic part 25 interposed between the outer cylinder part 23 and the inner cylinder part 24. Here, since the inner cylinder part 24 and the outer cylinder part 23 are thermally welded by the rubber elastic part 25, the rubber elastic part 25 absorbs vibrations and shocks generated in the inner cylinder part 24. Function as. That is, a so-called damper function is realized by the inner cylinder part 24, the outer cylinder part 23, and the rubber elastic part 25.

  On the other hand, as shown in FIG. 5, the base frame portion 11 to which the caster support fixing member 21 is attached has two second through holes 19 penetrating the base frame portion 11 in the vertical direction. Yes.

  The second through holes 19 arranged at the front and rear are arranged corresponding to the mounting positions of the caster support fixing members 21 of the base frame portion 11, and the first through holes of the caster support fixing members 21 are arranged. The fastening bolt 42 is inserted through the holes 33a and 33b.

  Here, the arrangement of the caster support fixing member 21 will be described in more detail. When the caster support fixing member 21 is attached to the front portion of the base frame portion 11, the caster support fixing member 21 is attached to the second through hole. 19 is arranged at the mounting position of the base frame portion 11 formed. Here, the mounting position of the caster support fixing member 21 is determined as a position where the first through holes 33a and 33b and the second through hole 19 communicate in the vertical direction.

  Next, in a state where the caster support fixing member 21 is disposed at the mounting position of the base frame portion 11, the fastening bolt 42 is inserted from the concave portion 34 a on the upper side of the main body portion 22, and the first through hole 33 a, the first The two through holes 19 and the first through hole 33b are inserted in this order. Then, a nut 43 is screwed onto the front end portion of the fastening bolt 42 protruding from the lower concave portion 34b, and the body portion 22 is tightened by the fastening bolt 42 and the nut 43 as shown in FIG. Is fixed to the base frame portion 11. The fastening bolt 42 and the nut 43 constitute a solidification mechanism according to the present invention.

  It should be noted that, when tightening is performed by screwing the fastening bolt 42 and the nut 43, since it can be detached, there is an advantage that replacement or repair can be easily performed in the event of a failure. On the other hand, the tightened fastening bolts 42 and nuts 43 may be fixed by a predetermined adhesive so that they cannot be detached. In this case, the tightened state can be more stably maintained.

  As shown in FIG. 6, a caster 51 is supported and fixed to the caster support fixing member 21 attached to the base frame portion 11. Here, the caster 51 includes a caster wheel 52, a fork portion 53 that rotatably supports the caster wheel 52, and a caster turning shaft 54 that protrudes upward from the upper portion of the fork portion 53. .

  The fork portion 53 supports the axle 55 (see FIG. 2) of the caster wheel 52 on both sides of the caster wheel 52, and a lower end portion of the caster turning shaft 54 via a bearing disposed on the upper end portion thereof. (Not shown).

  On the other hand, the caster turning shaft 54 has a hexagonal seat 61 fixed to the lower end portion thereof, and a lower end portion below the hexagonal seat 61 is supported by a bearing of the fork portion 53 so that the fork portion 53 Projected upward.

  In the caster 51 described so far, the fork portion 53 and the caster wheel 52 are integrally rotatable with respect to the caster turning shaft 54 around the central axis of the caster turning shaft 54. As the caster 51, a commonly used one can be applied, and the details thereof are omitted.

Hereinafter, a procedure for attaching the caster 51 will be described.
As shown in FIG. 6, the caster turning shaft 54 of the caster 51 is fitted into the inner cylinder portion 24 of the caster support fixing member 21 from the lower side, and the male screw formed on the upper end portion of the caster turning shaft 54. A fixing nut 62 is screwed onto the portion 57. Here, the hexagonal seat 61 of the caster turning shaft 54 is crimped to the lower end edge of the inner cylinder part 24 via the washer 66, and the fixing nut 62 is crimped to the upper end edge of the inner cylinder part 24 via the washer 67. The Thus, the caster turning shaft 54 is supported and fixed to the caster support fixing member 21, so that the caster 51 is attached to the base frame portion 11 constituting the main body frame 10 of the wheelchair 1 via the caster support fixing member 21. It is attached (see FIGS. 1 and 2).

  According to such a configuration, the caster can be easily attached, and the operational effects of the present invention, that is, improvement of workability of the caster and reduction of work cost can be further improved.

  With the casters 51 attached to the main body frame 10 of the wheelchair 1 as described above, the casters 51 are rotatable with respect to the main body frame 10. Further, in this attached state, the caster turning shaft 54 is fixed only to the inner cylinder portion 24 of the caster support fixing member 21, so that the impact and vibration applied to the inner cylinder portion 24 from the caster 51 are affected by rubber elasticity. It can absorb by the part 25, and it can suppress as much as possible that these impacts and vibrations are transmitted to the outer cylinder part 23. FIG. That is, it is possible to suppress the impact and vibration generated in the caster 51 during traveling of the wheelchair 1 from being transmitted to the main body frame 10 by the damper action of the caster support fixing member 21.

  Further, by attaching the caster 51 to the main body frame 10 using the caster support fixing member 21, a damper as a separate member is not required as in the conventional configuration described above, and the operation of attaching the damper can be omitted. Therefore, when attaching the caster 51 to the main body frame 10 of the wheelchair 1, the work process can be reduced as compared with the conventional configuration. Therefore, the workability of attaching the caster 51 to the main body frame 10 becomes good, and the work cost can be reduced.

  Further, in the present invention, since a damper with high dimensional accuracy is not required, the manufacturing cost required for the damper can be drastically reduced.

  Furthermore, since the caster support fixing member 21 of the present embodiment can be attached to the main body frame 10 of the wheelchair 1 by the fastening bolts 42 and the nuts 43, such attachment work is easy and the attached state is stabilized. Can be held.

  As shown in FIG. 6, the outer diameters of the washers 66 and 67 disposed at the upper and lower ends of the inner cylinder part 24 are determined to be at least larger than the inner diameter of the outer cylinder part 23. ing. For this reason, even if the rubber elastic part 25 deteriorates and the inner cylinder part 24 moves up and down excessively with respect to the outer cylinder part 23, when the inner cylinder part 24 moves up and down, When the washers 66 and 67 come into contact with the upper end or the lower end of the outer cylinder part 23, the caster 51 is prevented from falling off or excessively entering the outer cylinder part 23. The washer 66, 67 constitutes a receiving member according to the present invention.

  In this invention, it is not limited to the Example mentioned above, About another structure, it can change suitably within the range of the main point of this invention.

DESCRIPTION OF SYMBOLS 1 Wheelchair 10 Main body frame 19 2nd through-hole 21 Caster support fixing member (Caster support fixing member for wheelchairs)
22 Main body part 23 Outer cylinder part 24 Inner cylinder part 25 Rubber elastic part 33a, 33b First through-hole 42 Fastening bolt 43 Nut 51 Caster 54 Caster turning shaft 57 Male thread part 62 Fixing nut 66, 67 Washer (receiving seat) Element)

Claims (1)

A wheelchair caster support fixing member used for supporting and fixing a caster to a lower part of a body frame in a wheelchair,
A main body unit fixed to a lower part of the main body frame via a consolidation mechanism;
A cylindrical outer cylinder coupled to the main body;
A cylindrical inner cylinder portion that is disposed in the outer cylinder portion along the cylindrical direction of the outer cylinder portion and into which the caster turning shaft of the caster is inserted and fixed;
A rubber elastic part that holds the inner cylinder part in the outer cylinder part by being interposed between the outer cylinder part and the inner cylinder part;
The main body part, the outer cylinder part, the inner cylinder part, and the rubber elastic part are formed as a single body , and the rubber elastic part is bonded to the outer cylinder part and the inner cylinder part, respectively. And
The caster turning shaft is fixed to the inner cylinder portion by screwing a fixing nut to the male screw portion formed at the upper end portion of the caster turning shaft inserted and fixed to the inner cylinder portion,
A caster support fixing member for a wheelchair , wherein a receiving seat member having an outer diameter at least larger than an inner diameter of the outer cylinder portion is disposed at an upper end and a lower end of the inner cylinder portion .

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