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Title:
Adjustable crutch
United States Patent 2422451
Abstract:
This invention relates to an adjustable crutch, one of the objects: being- to: provide a structure, of this -type which can be made entirely of metal and which can be adjusted readily either to meet the requirements of persons of different:sizes or to permit its collapse into compact form so...


Inventors:
Crampton, Watters Joseph
Publication Date:
06/17/1947
Assignee:
Crampton, Watters Joseph
Primary Class:
Other Classes:
135/72, 135/82
International Classes:
A61H3/02
View Patent Images:
US Patent References:
2264015Crutch
2172047Adjustable and collapsible crutch
2116730Crutch
0904481N/A
Description:

This invention relates to an adjustable crutch, one of the objects: being- to: provide a structure, of this -type which can be made entirely of metal and which can be adjusted readily either to meet the requirements of persons of different:sizes or to permit its collapse into compact form so as to occupy the minimum space when not in use.

A -further object is to provide. simple and efficient means for holding the crutch against collapse after it has -been brought to the desired length- said- means- being easily releasable, however, to allow the crutch to be collapsed when desired.

With the foregoing and other objects .in view which-- will appear as the description proceeds, the invention consists, of certain novel details of construction and combinations of parts hereinafter -more: fully described- and pointed out in the claims, it being understood that changes may be made in the construction and arrangement of parts without departing from the spirit of the invention as claimed.

In the accompanying drawing the preferred form of the invention has been shown.

In said drawing: Figure 1 is an elevation of the crutch, a portion being broken away and the hand grip being shown by full lines in active position-and by broken lines in inactive position.

Figure 2 is- a side elevation- of the crutch, the lower portion being broken- away.

Figure 3 is an enlarged view partly in section and partly inelevation through the lower member of the crutch and showing portions of the upper member therein.

Figure 4 -is a- section through the housing of the coupling structure -taken on the line" 4-4, Fig: 3, the parts in the housing being shown, in elevation and portions -of the upper and lower sections of the crutch also being shown in elevation.

Figure 5 is a horizontal section through the housing of the locking mechanism.

Referring to the figures by characters 'of -reference, I designates the tubular lower section of 4 the crutch which canbe made of aluminum alloy or other suitable light metal. Fixedly secured in the lower end of this member is a plug 2 having a,-central opening 3-in which a stem 4 is mounted for limited sliding movement, the. movement of the 'stem-in a downward direction being adjustably restrained by nuts 5.- The lower end:of this stem is fixedly joined to a foot 6 the lower surface of which can carry a pad 7 of rubber or other material which will not slip on pavements 5 or the-like. Coiled springs 8 are seated in spaced sockets 9 within the plug 2 and exert a constant downward thrust against the foot. Thus they form cushions whereby shock due to abrupt contact of the foot and its pad with a supporting surface will not be transmitted to the section, I that willbe absorbed by the springs.

A housing 10 is permanently joined to the upper end- of the section I and is provided, in the lower portion thereof, with parallel tubular guides II opened at their ends and, extending through'the section 1. These guides which are spaced apart as shown in Fig. 3 receive parallel tubular strips 12 joined -at their upper ends by the head 13 of the crutch which constitutes an arm or shoulder rest. These strips 12 are free to slide within the guides 1I when unsecured so that it thus becomes possible to elongate or collapse the crutch to meet the requirements.

The housing- I0 'has supporting flanges extending thereinto from opposed sides and slidable on these flanges -between the strips 12 and the respective sides, of the housing 10 are jaws 15 in the form of blocks each of which has a longitudinal channel' 8 in its inner side proportioned to receive the adjacent tubular strip 12. Each of these channels has teeth or serrations 17 on its inner surface so located that. when the blocks 15 are moved toward each other these teeth or serrations will engage corresponding teeth or serrations 18 carried by the respective strips 12.

Oppositely extending pins 19 are carried by the channeled portions of the respective blocks and are extended into cam slots 20 provided in discs 21 which are mounted on and secured to a short shaft 22 journaled in opposed walls of the housing 10. Thus the two discs will rotate in unison and the. cam slots in both discs are so located and proportioned.that when the discs are rotated in one direction the pins on the opposed blocks will be drawn.toward each other thereby.causing the- teeth or serrations IT to engage the. teeth or serrations 18,. Consequently the tubular strips 12 will be locked. against sliding movement rela5 tive to the housing 10 and section I. By rotating the discs 21 -in the-,opposite direction the blocks 15 will be-moved apart so that the teeth will become-disengaged rand collapse, or adjustment of the crutch can be.effected. Each of the discs 0 21 has a-,tongue ,23 extended radially therefrom and both tongues are-positioned in the path of turn buttons 24 mounted on and movable with a shaft 25. This shaft is journaled in the housing and has a projecting end to which is secured the 5 shank 26 of a hand grip 27. A lug 28 is extended laterally from the shank and carries a set screw 29 adapted to be moved into either of two opposed recesses 30 formed in bosses 31 located on the housing 10 at opposite sides of the shaft 25.

It will be noted that when the set screw 2 is seated in one of the recesses 30 the turn buttons 24 are held pressed against the tongues 23 while the toothed blocks 15 are in engagement with the toothed strips 12. At this time the hand grip 21 is in its raised or working position where it can be reached readily by the user of the crutch. By disengaging the set screw while in the position stated, the grip 2 can be swung downwardly to the position shown by broken lines in Fig. 1 after which the set screw 29 can be inserted into the other recess 30. With the parts thus located, the upper section of the crutch composed of the strips 12 and the connecting rest or head 3 can be lowered relative to the housing 10 and section I due to the fact that the movement of the grip as stated will cause the turn buttons 24 to rotate in the opposite direction and shift discs 21 so as to push the pins 19 from each other and disengage the toothed blocks from the toothed strips 12.

Importance is attached to the fact that the adjustment of the crutch as well as its collapse can be effected readily and to the further fact that the grip while in active position will hold the crutch against collapse whether or not ther o no e has been failure to secure the locking means through . the use of the set screw 29.

What is claimed is: 1. An adjustable and collapsible crutch including a tubular lower section, an upper section comprising a rest and separate strips extending 3g from said rest and mounted for sliding movement in the tubular section, a housing carried by the tubular section and surrounding a portion of the upper section, a hand grip movably connected to the housing and means within the housing con- 4 trolled by the movement of the hand grip into active position for locking the sections against relative movement.

2. A crutch including a tubular lower section, a housing on the upper end thereof, an upper section extending into and slidably mounted within 4 the housing and lower section, a hand grip pivotally connected to the housing for movement into either upwardly or downwardly extended position relative to the housing, and cooperating means on the upper section and in the housing and controlled by the movement of the hand grip into upwardly extended position, for locking the sections against relative movement.

3. A crutch including a tubular lower section, a housing on the upper end thereof, an upper section extending into and slidably mounted within the housing and lower section, a hand grip pivotally connected to the housing for movement into either upwardly or downwardly extended position relative to the housing, cooperating means i on the upper section and in the housing and controlled by the movement of the hand grip into upwardly extended position, for locking the sections against relative movement, said means including opposed toothed jaws slidably mounted within the housing, said upper section having toothed portions interposed between the jaws, a shaft rotatable with the hand grip, and means for transmitting motion from said shaft to the jaws to simultaneously shift the jaws into or out of engagement with the toothed portions of the upper sections.

4. A crutch including a tubular lower section, a housing on the upper end thereof, an upper section extending into and slidably mounted within the housing and lower section, a hand grip pivotally connected to the housing for movement into either upwardly or downwardly extended position relative to the housing, cooperating means on the upper section and in the housing and controlled by the movement of the hand grip into upwardly extended position, for locking the sections against relative movement, said means including opposed toothed jaws slidably mounted in the housing, rotatable cam elements in the housing, means connecting said cam elements and the jaws for shifting the jaws toward each other when the cam elements are moved in one direction and for moving them apart when the cam elements are moved in the opposite direction, a shaft in the housing rotatable with the hn and grip, and means rotatable with the shaft for simultaneously shifting said cam elements to move the jaws toward and from each other, said upper sections being extended between the jaws and positioned for engagement thereby.

5. A crutch including a tubular lower section, a housing on the upper end thereof, an upper section extending into and slidably mounted within the housing and lower section, a hand grip pivotally connected to the housing for movement into either upwardly or downwardly extended position relative to the housing, cooperating means on the upper section and in the housing and ctd controlled by the movement of the hand grip into upwardly extended position, for locking the sections against relative movement, said means including opposed toothed jaws slidably mounted in the housing, rotatable cam elements in the housing, means connecting said cam elements and the jaws for shifting the jaws toward each 0 other when the cam elements are moved in one direction and for moving them apart when the cam elements are moved in the opposite direction, a shaft in the housing rotatable with the hand grip, turn buttons rotatable with the shaft, Smeans carried by the cam elements for engage5 ment with and actuation by the turn buttons, the upper section being positioned between the jaws for engagement thereby when shifted toward each other.

6. A crutch including a tubular lower section, 50 an upper section connectable thereto comprising parallel strips and a rest connecting the strips, a cushioned foot movably connected to the lower end of the lower sections, a hand grip joined to the lower section and mounted to swing into an 55 upwardly or downwardly extended position, and means operated by the movement of the hand grip into an upwardly extended position for locking the sections together.

JOSEPH CRAMPTON WAITERS.

REFERENCES CITED The following references are of record in the file of this patent: 65UNITED STATES PATENTS UNITED STATES PATENTS Number 904,481 2,116,730 2,172,047 2,264,015 Name Date. Hood ------------- Nov. 17, 1908 Menton ----------- May 10, 1938 Jacobucci -------- Sept. 5, 1939 Bennett ---------- Nov. 25, 1941