GB2413067A

GB2413067A - A shock absorber for a seat of a cart

Info

Publication number: GB2413067A
Application number: GB0408263A
Authority: GB
Inventors: Samuel Lin
Original assignee: Sunpex Technology Co Ltd
Current assignee: Sunpex Technology Co Ltd
Priority date: 2004-04-14
Filing date: 2004-04-14
Publication date: 2005-10-19
Anticipated expiration: 2024-04-14
Also published as: GB0408263D0; GB2413067B

Abstract

A shock absorber for a seat of a cart for a person to ride on, comprises an outer tube 2 secured on an upper surface of a frame of a cart; an inner tube 4 secured to a bottom surface of the seat and movably disposed inside the outer tube 2; and a spring loaded shock absorbing mechanism 5. The outer tube 2 is formed with a pair of opposing radial through-holes 21 on an upper end portion thereof, whilst the inner tube 4 is formed with two opposing axially extending slots 41; the inner tube 4 being prevented from separating from the outer tube 2 with the help of a pin 22, which is passed through the radial holes 21 and the slots 41. The shock absorbing mechanism 5 is held in the outer tube 2 and connected to lower ends of the outer tube 2, and inner tube 4 at respective upper and lower ends.

Description

SHOCK ABSORBER OF A SEAT OF A CART FOR A PERSON TO

RIDE ON

BACKGROUND OF THE INVENTION s

1. Field of the invention

The present invention relates to a shock absorber of a seat of a cart for a person to ride on, which can reduce violent shaking of the seat effectively for the cart to be comfortable to ride on.

0 2. Brief Description of the Prior Art

Conventional carts for people to ride on are usually only equipped with shock absorbers between the wheels and the frame, but are not equipped with shock absorbers for the seats. Therefore, violent shaking of one such conventional cart can't be effectively reduced, and a person ridding on the cart will still feel uncomfortable when the cart is shaking violently.

SUMMARY OF THE INVENTION

It is a main object of the present invention to provide a shock absorber of a seat of a cart for a person to ride on such that violent shaking of the seat can be effectively reduced.

The shock absorber of the present invention includes an outer tube secured on an upper side of a frame of the cart, an inner tube secured on a bottom of the seat and movably passed into the outer tube, and a spring- loaded shock absorbing mechanism. The outer tube is formed with a pair of opposing radial holes on an upper end portion. The inner s tube is formed with two opposing lengthwise extending slots, and is prevented from separating from the outer tube with help of a pin, which is passed through the radial holes as well as the slots; the shock absorbing mechanism is held in the outer tube and connected to the outer tube, and a lower end of the inner tube at lower and upper ends thereof 0 respectively.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be better understood by referring to the accompanying drawings, wherein: Fig. 1 is a perspective view of the cart for a person to ride on according to the present invention, Fig. 2 is an exploded perspective view of the shock absorber of the present invention, Fig. 3 is a vertical section of the shock absorber according to the present invention, Fig. 4 is a vertical section of the shock absorber of the present invention functioning, Fig. 5 is another vertical section of the shock absorber of the present invention functioning, Fig. 6 is an exploded perspective view of the second embodiment, s Fig. 7 is a vertical section of the second embodiment, and Fig. 8 is a vertical section of the second embodiment functioning.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

0 Referring to Figs. 1 and 2, a preferred embodiment of a shock absorber of a seat 3 of a cart for a person to ride on includes an outer tube 2, a shock absorbing mechanism 5, and an inner tube 4.

The outer tube 2 is secured on an upper side of a frame 1 of the cart at a lower end, and upright, and is formed with several pairs of IS opposing radial through holes 21 along an upper end portion, and several pairs of opposing radial through holes 23 along a lower end portion thereof; the number of the upper radial through holes 21 are the same as that of the lower radial through holes 23, and the distance between every two adjacent upper holes 21 is the same as the distance between every two adjacent lower holes 23. A locating element 24 is disposed in the lower portion of the outer tube 2, and is secured in position by means of a securing pin 25, which is tightly passed through a selected pair of lower through holes 23 as well as the locating element 24.

The inner tube 4 is secured on a bottom of the seat 3 at an upper end thereof, and upright, and is formed with two lengthwise extending slots 41, which are right faced with each other, and are near to a lower end of the inner tube 4. A strengthening element 42, which has a through s hole similar to the slots 41 in shape, is tightly fitted in the slots 41. The inner tube 4 is up and down movably passed into the outer tube 2, and a pin 22 is passed through a selected pair of upper through holes 21 as well as the strengthening element 42 to prevent the inner tube 4 from separating from the outer tube 2; thus, the inner tube 4 can only be lo displaced relative to the outer tube 2 within a certain range.

The shock absorbing mechanism 5 is disposed between the locating element 24 of the outer tube 2 and the lower end of the inner tube 4, and includes a bolt 51, a lower cap 52, an elastic element 53, an upper cap 54, and a nut 55; the lower cap 52 is securely connected to the IS locating element 24, the elastic element 53 is positioned right above the lower cap 52, and the upper cap 54 is positioned right above the elastic element 53 while the bolt 51 is first passed through the lower cap 52, the elastic element 53, and the upper cap 54 in sequence, and then screwed into the nut 55. In addition, the upper cap 54 is securely connected to the lower end of the inner tube 4. Thus, violent shaking of the seat 3 will be reduced owing to the shock absorber, and the cart more comfortable to ride on.

In assembling the cart of the present invention, referring to Fig. 3, s first the lower cap 52 of the shock absorbing mechanism 5 is joined to the locating element 24, and the upper cap 54 is joined to the lower end of the inner tube 4. Next, the shock absorbing mechanism 5 and the inner tube 4 are passed into the outer tube 2, and the locating element 24 is s secured in the lower end of the outer tube 2, and the pin 22 is passed through a selected pair of upper radial through holes 21 as well as the strengthening element 42.

Referring to Figs. 4 and 5, when a person is ridding on the cart, and the seat 3 is caused to move up and down owing to uneven surface lo of the ground, the elastic element 53 will change shape accordingly, and reduce violent shaking of the seat 3.

To adjust the height of the seat 3, one should first remove the pins 22 and 25 from the original through holes 21, 23 of the outer tube 2, and then pass the pin 22 through another pair of upper radial through holes 21, e.g. the uppermost pair, as well as the strengthening element 42, and also pass the locating pin 25 through another pair of lower radial through holes 23 accordingly, i.e. the uppermost pair, as well as the locating element 24.

Referring to Figs. 6 to 8, a second embodiment of a shock absorber of a seat of a cart includes an outer tube 6, a shock absorbing mechanism 8, and an inner tube 7.

The outer tube 6 is secured on an upper side of a frame of the cart, upright, and has several pairs of opposing radial through holes 61 along an upper end portion, and several pairs of opposing radial through holes 62 along a lower end portion; the number of the upper radial through holes 61 are the same as that of the lower radial through holes 62; the upper radial holes 61 are equidistantly spaced, and the distance between s every two adjacent lower radial holes 62 is the same as the distance between every two adjacent upper radial holes 61. Furthermore, a pin 64 is passed through a selected pair of lower radial through holes 62, and secured in position.

The inner tube 7 is secured on a bottom of the seat of the cart, 0 upright, and is formed with two lengthwise extending slots 71, which oppose each other, on a lower end portion thereof. A strengthening element 72, which has a through hole similar to the slots 71 in shape, is tightly fitted in the slots 71. The strengthening element 72 is further formed with a gap 721 on a lower end. The inner tube 7 is up and down movably passed into the outer tube 6, and a pin 63 is passed through a selected pair of upper radial holes 61 as well as the slot-shaped through hole of the strengthening element 72 to prevent the inner tube 7 from separating from the outer tube 6; thus, the inner tube 7 can only be displaced relative to the outer tube 6 within a certain range. Furthermore, a locating pin 73 is passed through a lower end of the inner tube 7, and secured in position.

The shock absorbing mechanism 8 includes an elastic element 81, which is disposed in the outer tube 6, passed through the lower gap 721 of the strengthening element 72, and hooked over the pins 63 and 73 respectively at upper and lower ends thereof; thus, when one is ridding one the cart, violent shaking of the seat will be reduced owing to the elastic element 8, and the cart more comfortable to ride on.

In assembling the cart, referring to Fig. 7, the inner tube 7 is passed into the outer tube 6, and the pin 63 is passed through a selected pair of upper radial holes 61 as well as the slot-shaped through hole of the strengthening element 72. And, the elastic element 8 is passed through the gap 721 of the strengthening element 72, and hooked over the pin 63, and the locating pin 73 respectively at upper and lower ends thereof. And, the outer tube 6 is secured to the cart frame. Thus, the pin 64, which is secured to the lower end of the outer tube 6, can prevent the inner tube 7 from moving down past it when the cart is being ridded.

Referring to Fig. 8, when a person is ridding on the cart, and the seat is caused to shake violently owing to uneven surface of the ground, the elastic element 8 will be stretched in downward movement of both the inner tube 7 and the seat, and reduce violent shaking of the seat.

From the above description, it can be easily understood that the shock absorber of the present invention can reduce violent shaking of the seat effectively while one is ridding on the cart.

Claims

WHAT IS CLAIMED IS: 1. A shock absorber of a seat of a cart for a person

to ride on, comprising s an outer tube secured on an upper side of a frame of a cart at a lower end thereof; the outer tube being formed with a first pair of opposing radial through holes on an upper end portion thereof; an inner tube secured on a bottom of a seat of the cart at an upper end thereof; the inner tube being formed with two lengthwise extending slots faced with each other; the inner tube being movably passed into the outer tube; the inner tube being prevented from separating from the outer tube with help of a first pin, which is passed through the opposing radial through holes as well as the slots; and a shock absorbing mechanism held in the outer tube and connected to the outer tube and a lower end of the inner tube at lower and upper ends thereof respectively for reducing shaking of the seat.
2. The shock absorber as claimed in claim 1, wherein a strengthening element, which has a through hole similar to the slots of the inner tube in shape, is tightly fitted in the slots for allowing the first pin to pass through.
3. The shock absorber as claimed in claim 2, wherein the outer tube is formed with a first pair of opposing radial through holes on a lower end portion thereof, and has a locating element disposed therein; the locating element being secured in position by means of a second pin, which is passed through the pair of opposing radial through holes of the outer tube lower end portion, and is connected to the locating element; the lower end of the shock absorbing mechanism being connected to the locating element.
4. The shock absorber as claimed in claim 1, wherein the outer tube is formed with a first pair of opposing radial through holes on a lower end portion thereof, and has a locating element disposed therein; the locating element being secured in position by means of a second pin, 0 which is passed through the pair of opposing radial through holes of the outer tube lower end portion, and is connected to the locating element; the lower end of the shock absorbing mechanism being connected to the locating element.
5. The shock absorber as claimed in claim 1, wherein the outer tube is formed with a plurality of pairs of equidistantly spaced opposing radial through holes along the upper end portion thereof in addition to the first pair for allowing the first pin to be connected thereto, and a plurality of pairs of opposing radial through holes along a lower end portion thereof for a second pin to be connected thereto; number of the upper radial through holes being same as that of the lower radial through holes; the lower through holes being as equidistantly spaced as the upper through holes; the shock absorbing mechanism being connected to the second pin at the lower end thereof, thus allowing the seat to be adjusted in height by means of relocating the first and the second pins.
6. The shock absorber as claimed in claim 5, wherein the outer tube has a locating element disposed therein, which is secured in position by means of the second pin, and which is connected to the lower end of the shock absorbing mechanism.
7. The shock absorber as claimed in claim 5, wherein a strengthening element, which has a through hole similar to the slots of the inner tube in shape, is tightly fitted in the slots for allowing the first pin to pass through.

lo
8. The shock absorber as claimed in claim 7, wherein the outer tube has a locating element disposed therein, which is secured in position by means of the second pin, and which is connected to the lower end of the shock absorbing mechanism.
9. The shock absorber as claimed in claims 1, 2, 3, 4, 5, 6, 7 or 8, wherein the shock absorbing mechanism includes: a lower cap connected to the outer tube; an elastic element arranged on the lower cap; an upper cap arranged on an upper end of the elastic element and connected to the lower end of the inner tube; a nut arranged on the upper cap; and a bolt passed through the caps as well as the elastic element, and joined to the nut.
10. A shock absorber of a seat of a cart for a person to ride on, comprlsmg an outer tube secured on an upper side of a frame of a cart at a lower end thereof; the outer tube being formed with a first pair of opposing radial through holes on an upper end portion thereof; an inner tube secured on a bottom of a seat of the cart at an upper end thereof; the inner tube being formed with two lengthwise extending slots faced with each other; the inner tube being movably passed into the outer tube; the inner tube being prevented from separating from the outer tube with help of a first pin, which is passed through the opposing radial lo through holes as well as the slots; the inner tube having a locating pin secured to a lower end thereof; and a shock absorbing mechanism held in the inner tube and connected to the first pin, and the locating pin respectively at upper and lower ends thereof for reducing shaking of the seat.
11. The shock absorber as claimed in claim 10, wherein a strengthening element is secured in the slots of the inner tube; the strengthening element having a through hole, which is similar to the slots in shape for the first pin to pass through; the strengthening element having a gap on a lower end for the upper end of the shock absorbing mechanism to be passed through.
12. The shock absorber as claimed in claim 10, wherein the outer tube is formed with a plurality of pairs of equidistantly spaced opposing radial through holes along the upper end portion thereof in addition to the first pair for allowing the first pin to be connected thereto, thus allowing the seat to be adjusted in height by means of relocating the first pm.
13. The shock absorber as claimed in claim 12, wherein a strengthening element is secured in the slots of the inner tube; the strengthening element having a through hole, which is similar to the slots in shape for the first pin to pass through; the strengthening element having a gap on a lower end for the upper end of the shock absorbing mechanism to be passed through.
14. A shock absorber according to any of Claims 9 to 13, wherein the shock absorbing mechanism is an elastic element. ( i ( 1 . . I. ( 1 ( .

14. The shock absorber as claimed in claim 10, wherein the outer tube is formed with a pair of opposing radial through holes on a lower end portion thereof, and a pin is passed through the lower radial holes and secured in position for limiting downward movement of the inner tube.

15. The shock absorber as claimed in claim 11, wherein the outer tube is formed with a pair of opposing radial through holes on a lower end portion thereof, and a pin is passed through the lower radial holes and secured in position for limiting downward movement of the inner tube.

16. The shock absorber as claimed in claim 12, wherein the outer tube is formed with a pair of opposing radial through holes on a lower end portion thereof, and a pin is passed through the lower radial holes and secured in position for limiting downward movement of the inner tube.

17. The shock absorber as claimed in claims 10, 11, 12, 13, 14, 15 or 16, wherein the shock absorbing mechanism is an elastic element. s 1\

Amendments to the claims have been filed as follows: 1. A shock absorber, for a seat of a cart for a person to ride on, comprising: an outer tube secured at a lower end to an upper side of a frame of the cart, the outer tube being formed with a first pair of opposing radial through holes on an upper end portion thereof; an inner tube secured at an upper end to a bottom of the seat, the inner tube including two elongate slots extending along the length thereof, the elongate slots being opposite one another, the inner tube being slidably received in the outer o tube, the inner tube being prevented from separating from the outer tube by a first pin which passes through the opposing radial through holes and the slots; and a shock absorbing mechanism held in the outer tube and connected to the outer tube and a lower end of the inner tube at lower and upper ends thereof respectively for reducing shaking of the seat.

2. A shock absorber according to Claim 1, wherein a strengthening element, which has a through hole similar in shape to the slots of the inner tube, is tightly fitted in the slots, the strengthening element allowing the first pin to pass therethrough.

3. A shock absorber according to Claim 1 or 2, wherein the outer tube is formed with a second pair of opposing radial through holes on a lower end portion thereof, and has a locating element disposed therein, the locating element being secured in position by means of a second pin which passes through the pair of opposing radial through holes of the outer tube ,, lower end portion, and is connected to the locating element; and ( ( . the lower end of the shock absorbing mechanism being connected to the it;' locating element.

<' 30 4. A shock absorber according to Claim 1, wherein the outer tube is formed with . . . a plurality of pairs of equidistantly spaced opposing radial through holes along the upper end portion thereof in addition to the first pair of opposing radial through holes, each pair of opposing radial through holes allowing the first pin to be connected thereto; and a plurality of pairs of opposing radial through holes along a lower end portion thereof for a second pin to be connected thereto; the number of upper radial through holes being same as the number of lower radial through holes; the lower through holes being equidistantly spaced by the same distance as lo the upper through holes; and the shock absorbing mechanism being connected to the second pin at the lower end thereof, wherein the seat is adjustable in height by means of relocating the first and the second pins.

5. A shock absorber according to Claim 4, wherein the outer tube has a locating element disposed therein, which is secured in position by means of the second pin, and which is connected to the lower end of the shock absorbing mechanism.

6. A shock absorber according to Claim 4, wherein a strengthening element, which has a through hole similar in shape to the slots of the inner tube is tightly fitted in the slots for allowing the first pin to pass therethrough.

7. A shock absorber according to Claim 6, wherein the outer tube has a locating element disposed therein, which is secured in position by means of the second pin, and which is connected to the lower end of the shock absorbing mechanism. i, (

8. A shock absorber according to any preceding claim wherein the shock absorbing mechanism includes: a lower cap connected to the outer tube, an elastic element arranged on the lower cap, \b an upper cap arranged on an upper end of the elastic element and connected to the lower end of the inner tube; a nut arranged on the upper cap; and a bolt passed through the caps as well as the elastic element, and joined to the nut.

9. A shock absorber, for a seat of a cart for a person to ride on, comprising: an outer tube secured at a lower end to an upper side of a frame of the cart, the outer tube being formed with a first pair of opposing radial through holes on lo an upper end portion thereof; an inner tube secured at an upper end to a bottom of the seat, the inner tube including two elongate slots extending along the length, thereof, the elongate slots being opposite one another; the inner tube being slidably received in the outer tube, the inner tube being prevented from separating from the outer tube by a first pin which passes through the opposing radial through holes and the slots the inner tube further having a locating pin secured to a lower end thereof; and a shock absorbing mechanism held in the inner tube and connected to the first pin, and the locating pin respectively at upper and lower ends thereof for reducing shaking of the seat.

10. A shock absorber according to Claim 9, wherein a strengthening element is secured in the slots of the inner tube, the strengthening element having a through hole, which is similar in shape to the slots, for the first pin to pass through, the strengthening element further having a gap on a lower end for the upper end of the shock absorbing mechanism to pass through. .

( ' ' 11. A shock absorber according to Claim 9, wherein the outer tube is formed ( . ( t with a plurality of pairs of equidistantly spaced opposing radial through holes along the upper end portion thereof in addition to the first pair for allowing the 30 first pin to be connected thereto, thereby allowing the seat to be adjusted in height (, ( . by means of relocating the first pin. ( ( ( ( ( . ( ( 1!

12. A shock absorber according to Claim 11, wherein a strengthening element is secured in the slots of the inner tube, the strengthening element having a through hole, which is similar in shape to the slots, for the first pin to pass through, the strengthening element further having a gap on a lower end for the upper end of the shock absorbing mechanism to pass through.

13. A shock absorber according to any of Claims 9 to 11, wherein the outer tube is formed with a pair of opposing radial through holes on a lower end portion thereof, and a pin is passed through the lower radial holes and secured in position l o for limiting downward movement of the inner tube.