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Publication numberUS854399 A
Publication typeGrant
Publication dateMay 21, 1907
Filing dateApr 18, 1906
Priority dateApr 18, 1906
Publication numberUS 854399 A, US 854399A, US-A-854399, US854399 A, US854399A
InventorsWalter G Bridge
Original AssigneeWalter G Bridge
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 854399 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATENTBD'MAY 21, 1907.



1u: Nunn: persas sa., wnsmlyamn, n. c.'

' discharge nozzle 14,


Specification of Letters Patent.

Patented May 21, 1907'.

Application filed April 18, 1906. Serial No. 312.381.

To @ZZ whom, t mm1/y concern:

Beit known that I, VALTER G. BRIDGE, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Syringes, which the following is a specification.

This invention relates particularly to syringes used for forcing small quantities of liquid through a contracted outlet, and it has particular reference to dental syringes for forcing liquid into the dentin or soft-tissue, although the invention is capable of being embodied in other types of syringes.

The invention has for its object to provide a syringe adapted to be conveniently held and manipulated entirely by one hand of the operator, the manipulation being effected by the contraction of the operators hand, between the palm and fingers of which the instrument is held.

The invention consists in the improvements which I will now proceed to describe and claim.

Of the accompanying drawings forming a part of this specificatioin-Figure 1 represents a side View of a syringe embodying my invention, the plunger of the syringe being retracted. Fig. 2 represents an enlarged section on line 2-2 of Fig. 1. Fig. 3 represents a view similar to Fig. 1, showing the plunger projected. Fig. 4 represents a perspective view of the part hereinafter termed the eX- tension of the syringe barrel. Fig. 5 represents a section on line 5`5 of Fig. 2. Fig. 6 represents a section on line 6`6 of Fig. 2.

The same letters of reference indicate the same parts in all the figures.

In the drawings, 12 represents the barrel or cylinder of a syringe, provided with a liquid-holding chamber 13, terminating in a which is, or may be, eX- ternally screw-threaded, to engage an eXtension or needle. The barrel is extended from the end opposite the nozzle 14, the extension 15 being preferably formed in a separate piece, and having a screw-thread connection at 16 with the chamber portion of the barrel.

17 represents the plunger, which is adapted to be reciprocated in the chamber 13.

18 represents a piston-operating member, which is movable upon the extension 15, and is preferably formed as a sleeve surrounding the extension, and adapted to slide thereon. The operating member 18 is provided with means adapted to be engaged by one or more l l 19 19 projecting parts of the operators hand, the means here shown comprising two finger-receiving loops from opposite sides of the l member 18.


The extension 15 is provided with means for engaging another part of the operators hand, the means here shown being a head 20, formed to bear upon the palm of the operators hand, the proportions of the instrument being such that when' the head 20 bears on or engages the palm, two of the fingers of the same hand may conveniently engage the loops 19, so that when the hand is contracted, the member 18 will be moved toward the head 20.

Means are provided for imparting reverse movement from the operating member 18 to the plunger 17 that is to say, when the meinber 18 is moved in either direction, the plunger is moved in the opposite direction, so that when the member 18 is moved toward the head 20 by the contraction of the operators hand, the plunger will be projected, an opposite movement of the member 18 causing the retraction of the plunger. The preferred means for accomplishing this result are as follows: The plunger 17 is provided with a shank or extension, formed as a rack 21, which is movable in an elongated cavity in the extension 15.A The operating member 18 is provided on its interior with a series of gear teeth 22, forming a rack, which is opposed to, or faces, the rack 21, the two racks eing separated by an intervening space of sufficient width to receive a pinion 23. The said pinion is provided with trunnions 24, which are journaled in bearings in the eX- tension 15. As will be seen by reference to Fig. 2, the pinion 23 meshes with the two racks, so' that when the operating member is moved in either direction, movement in the opposite direction is imparted through the racks and pinion to the plunger.

It will be seen that the described construction enables the plunger to be projected wholly by the movement of the fingers toward the palm of the operators hand. It has been found that this improved syringe is adapted to be manipulated with greater convenience to the operator than the ordinary type of syringe, and with greater steadiness and accuracy, because the delivering needle or nozzle and the head or handle 20 are always at the same distance apart, hence there is no liability of unsteady or involun- IIO tary motion of the point when the liquid is being ejected.

I claim:-

1. A syringe comprising a barrel, a plunger movable therein, an operating member mo vable on the barrel, and means for imparting reverse movement from the operating member to the plunger, the said barrel and oper ating member having means for engaging diilierent parts of an operators hand, whereby one hand is enabled to operate the syringe.

2. A syringe comprising a barrel, a plunger movable therein, an operating member movable on the barrel, said plunger and operating member having opposed racks7 and a pinion interposed between and meshing with said racks, whereby reverse movement is imparted from the operating member to the plunger.

3. A syringe comprising a barrel having an extension, a plunger having a shank formed as a rack movable in said extension, an operating member formed as a sleeve surrounding and movable on the barrel extension, and provided with an internal rack, and a pinion journaled in bearings in the extension and meshing with said racks.

In testimony whereof I have aflixed my signature in presence of two witnesses.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2695023 *Jan 4, 1952Nov 23, 1954Pfizer & Co CHypodermic syringe
US3595233 *Oct 6, 1967Jul 27, 1971Worch Hermann RMedical device for internally administering medicants
US3756240 *Jul 22, 1971Sep 4, 1973Fuchslocher RMedical apparatus for insertion of medications and/or hygienic preparations into body openings and/or cavities
US4465478 *Oct 14, 1982Aug 14, 1984Collagen CorporationSyringe force amplification device
US5743889 *Dec 17, 1993Apr 28, 1998Sams; BernardIncrementing dosage mechanism for syringe
US7364570 *Apr 15, 2004Apr 29, 2008Allergan, Inc.Controlled volume injection/aspiration device
US7517334Mar 25, 2005Apr 14, 2009Eli Lilly And CompanyMedication dispensing apparatus with spring-driven locking feature enabled by administration of final dose
US7641637Apr 23, 2008Jan 5, 2010Allergan, IncControlled volume injection/aspiration device
US7678084Mar 17, 2003Mar 16, 2010Eli Lilly And CompanyMedication dispensing apparatus with gear set for mechanical advantage
US7857791Mar 25, 2005Dec 28, 2010Eli Lilly And CompanyMedication dispensing apparatus with gear set having drive member accommodating opening
US8197450Oct 1, 2009Jun 12, 2012Novo Nordisk A/SInjection device
US8202256Jun 20, 2007Jun 19, 2012Novo Nordisk A/SInjection device
US8206361May 4, 2005Jun 26, 2012Novo Nordisk A/SInjection device
US8226618May 16, 2007Jul 24, 2012Novo Nordisk A/SGearing mechanism for an injection device
US8267899Oct 31, 2007Sep 18, 2012Novo Nordisk A/SInjection device
US8298194Feb 23, 2007Oct 30, 2012Novo Nordisk A/SInjection device and a method of changing a cartridge in the device
US8333739Oct 31, 2007Dec 18, 2012Novo Nordisk A/SInjection device
US8353878Mar 14, 2008Jan 15, 2013Novo Nordisk A/SInjection device comprising a locking nut
US8361036Mar 8, 2007Jan 29, 2013Novo Nordisk A/SInjection device having a gearing arrangement
US8641683Feb 28, 2012Feb 4, 2014Novo Nordisk A/SInjection device
US8900204Jun 20, 2012Dec 2, 2014Novo Nordisk A/SGearing mechanism for an injection device
US20040210200 *Apr 15, 2004Oct 21, 2004Gerondale Scott J.Controlled volume injection/aspiration device
US20050165363 *Mar 17, 2003Jul 28, 2005Judson Jared A.Medication dispensing apparatus with gear set for mechanical advantage
USRE29345 *Apr 22, 1976Aug 9, 1977The Franklin InstituteMethod and apparatus for non-surgical, reversible sterilization of females
WO1984001509A1 *Oct 14, 1983Apr 26, 1984Collagen CorpSyringe force amplification device
Cooperative ClassificationA61M5/31586