US655797A - Bicycle-pump. - Google Patents

Description

No. 655,797. Patented Aug. l4, I900.

W. M. REASON.

BICYCLE PUMP.

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ATENT Fries.

IVALTER M. REASON, OF PONTIAC, MICHIGAN.

BlCYCLE -PUMP.

SPECIFICATION forming part of Letters Patent No. 655,797, dated August 1%, 1900. Application filed September 28, 1899. Serial No. 731,902. (No model.)

.To aZZ whom it may concern:

Be it known that I, WALTER M. REASON, a citizen of the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful improvement in Bicycle-Pumps; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to bicycle-pumps, and has for its object an improved form of pump arranged to be automatically actuated while the wheel is in motion or service and which will inflate the pneumatic tire of such wheel until a certain predetermined pressure has been produced and which will then be automatically thrown out of operative condition and remain out of operative condition so long as the pressure remains constant, but which will again automatically begin to operate as soon as the pressure falls below that at which the pump is set to operate.

In the drawings, Figure 1 is an elevation showing the pump in position on the hub of a bicycle-wheel. In this figure part of the automatic setting-cylinder is broken away. Fig. 2 is a side elevation showing the connection between the pump and the wheel. It also shows an elevation of the pump-actuating disk. Fig. 3 is a longitudinal section of the pump. Fig. 4 is a perspective showing the piston-stem and the head of the pump through which the piston-stem works. Fig. 5 shows theend of the piston-stem and indicates the friction-ball in the end of the piston-stem. Fig. 6 shows the hook by means of which the pump'barrel is secured at one end to the wheelspokes. Fig. 7 shows the connection between the air-tube and the tire.

The pump-barrel A is a straight cylinder provided with a reciprocating piston B, which has a piston-stem b. The barrel has a closed end ct, sunk to receive the neck ct of an extension-brace C6 The neck a of the brace 01, is threaded, and the face a of it is provided with a number of notches to enable it to engage with the spokes of the wheel. A nut engages on the threaded neck a of the exten sion-brace c and the nut engages against the end of the barrel A and serves to adjust the total length of the pump and to bring the notched face a into engagement with the spokes and hold the pump firmly in place. That end of the pump-barrel through which the piston-rod extends is provided with ahook l-Lwith two or more clamps that engage around spokes of the wheel. The piston B reciprocates in the pump-barrel and is provided with a stem 6, that extends through the head I) of the pump-barrel and is actuated to expand the piston-chamber by a spring 19 The stem f b is hollow and contains within it the spring b and the spring I) is held between the closed outer end of the piston-stem and an abutment 19 In the form shown in the drawings the abutm entis formed as a part of the head I) and comprises that portion of the head I) which is located within an arched slot 12 through which the stem 12 engages. This, however, is only a modified form of a pin held to the head I), and the special form employed is not material; At the outer end of the piston-stem b is a socket, within which is seated a friction-ball b There is also at one side of the piston-stem b and near its outer end a catch it, that is adapted to engage under the hooked end of a bent lever h and this bent lever h is secured to the end I), that closes the barrel A. The means for securing the bent lever to the end of the barrel may be varied. As shown in the drawings, the means employed is a ring 1* with hinge-knuckles on it, and the bent lever is held by a pin that passes through the bend of the lever and through the hinge-knuckles. The ring r is held in any approved way to the head b. To the axle of the wheel is secured a warped disk D. The disk is fixed with respect to the framework, and as the wheel revolves, carrying with it the pump and the piston-stem b, the end of the piston-stem engages against the surface of the warped disk, near the edge of the disk. The spring 1) forces the piston-stem outward and causes the end of the stem or the friction-ball b to engage constantly against the disk; but the disk is warped, so that it lies across the axle at an angle thereto, and at each revolution means acting to force said piston in the opof the hub and the pump the piston is compelled to make a complete stroke under the combined action of the spring, which forces it outward, and of the disk, which forces it inward. Air is admitted into the pump-chamber through a valve-closed passage-way d and is driven by the instroke of the piston through the outlet d past the check-valve 61 into the pipe d and to the tire.

The automatic device for stopping vand starting the pump consists of the small piston-cylinder E, the bent lever k and the catch h. The piston-cylinder E lies parallel with the pump-barrel. It is provided with a piston e, which has a stem 6'. An adjustable tension-spring e surrounds this stem, and the tension of the spring is adjustable by means of a screw-abutment a The screw forms the outer end of the piston e and serves as a guide for the piston-stem e.

A small air-pipe f, that branches from the air-pipe d leads into the chamber of the piston-cylinder E. This pipe f opens into the chamber in which the piston e reciprocates, and preferably it is provided with an elastic terminal or bagf, the mouth of which is cemented to the pipe f and which serves in place of packing around the piston e. The outer end of the stem 6 engages against the end of the bent lever h and as soon as the air in the tire reaches the tension to which the spring of the setting device has been adjusted the piston e is pushed outward and the end of the lever 71 is pushed before the end of the piston and the hooked end of the lever is forced down to engage with the catch h, and so long as the tension of the air in the tire remains sufficiently high to hold the piston e out against the force of the spring 6 the hook continues in engagement with the catch h and the piston B is held from action. The pump continues to revolve with respect to the warped disk D; but the piston no longer travels outward. As soon, how ever, as the tension of air in the tire is relaxed, the spring 6 forces the piston c inward, the hook becomes disengaged from the catch h, the spring 27 forces the piston B outward, and the pump begins to operate to again force the air into the tire.

The tube 01 extends to where the nipple protrudes from the tire and terminates with a collar d A perforated disk or gasket (1 is placed on the end of the nipple, the collar d" is placed on the gasket, and a coupling d ,which is internally screw-threaded and engages on an external screw-thread on the nipple n, is employed to couple the parts together.

What I claim is 1. In a pump for pneumatic tires, in combination with a relatively-stationary camdisk, a pump-cylinder fixed to the wheel, a piston adapted to be reciprocated in one direction in said cylinder by said cam-disk,

posite direction with a yielding pressure, a

dog adapted to engage the said piston to hold it out of engagement with said cam-disk, and means whereby said dog is forced into engagement with said piston at a predetermined air-pressure in the tire, and is disengaged from said piston at a less pressure, substantially as described.

2. In a pump for pneumatic tires, in combination with a relatively-stationary camdisk, a pump-cylinder fixed to the wheel, a piston adapted to be reciprocated in said cylinder, a hollow piston-rod upon said piston adapted to contact said cam-disk, a spring within said piston-rod acting to press said rod against said cam-disk, a dog adapted to engage said piston-rod to hold the same out of engagement with said cam-disk,and means whereby said dog is forced into engagement with said piston-rod at a predetermined airpressure in the tire and is disengaged from said rod at a less pressure, substantially as described.

3. In a pump for inflating the pneumatic tires of wheels, in combination with the pumpbarrel, and means secured to the pump-bar'- rel for engaging the pump at one end to the wheel, a brace provided with a notched plate adapted to engage against spokes of the wheel, and an adjustable connection between the plate and pump-barrel, substantially as described.

4. In a pump for inflating pneumatic tires of wheels, in combination with the pump barrel, and means for securing on the piston of the pump a pistonchamber, a piston reciprocating therein adapted to actuate the hook, and a branch pipe leading from the air-conduit into the piston-chamber, and furnished with an elastic diaphragm constituting a closed terminal arranged to engage against said piston, substantially as described.

5. In a pump for pneumatic tires, in combination with a relatively-stationary camdisk, a pump-cylinder fixed to the wheel, a piston adapted to be reciprocated in one directionin said cylinder by said cam-disk, means acting to force said piston in the op posite direction with a yielding pressure, a dog adapted to engage with said piston to hold it out of engagement with said camdisk, a piston 6, connected with said dog, the cylinder around said piston, a spring 6 acting to' force the piston c, in one direction, the cylinder of the piston e, being so connected to the tire that the piston a, shall be urged in a direction opposite to the action of the spring e bya pressure proportional to the pressure in the tire, substantially as described.

6. In a pump for pneumatic tires, in combination with a relatively-stationary camdisk, a pump-cylinder fixed to the wheel, a piston adapted to be reciprocated in one direction in said cylinder by said cam-disk, Trans acting to force said piston in the opposite direction with a yielding pressure, a piston at a predetermined pressure in the dog adapted to engage with said piston to tire, substantially as described. I0 hold it out of engagement With said cam- In testimony whereof I sign this specificadisk, means whereby said dog is forced into tion in the presence of two Witnesses.

5 engagement with said piston at a predeter- WALTER M. REASON.

mined air-pressure in the tire, and is disen- WVitnesses: gaged from said piston at a less pressure, and CHARLES F. BURTON,

means for adjusting said dog to engage said JOHN N. GOODRICH.

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