Electromagnetic valve

An electromagnetic valve comprises yoke means having a pair of projecting elements which protrude outwardly in the mounting side of said valve, one of said projecting elements having at its outward end a pawl which is outwardly bent, and the other projecting element having its outer end portion which is inwardly bent substantially at right angle, said outer end portion having a threaded aperture for bolting said yoke means to a mounting bracket, said pawl in said one projecting element being engaged by an opening which is formed in said mounting bracket.

BACKGROUND OF THE INVENTION 
This invention relates to an electromagnetic valve, particularly such an 
electromagnetic valve that is suitable for mounting on a bracket together 
with other identical electromagnetic valves. 
There is well known an electromagnetic valve having yoke means which is 
formed therein at the mounting side of the valve body and through which 
the electromagnetic valve is mounted on a bracket. When a plurality of 
such identical electromagnetic valves are mounted on a single bracket, a 
space for bolt-tightening operation must be left between each adjacent 
valves so that a relatively large bracket will be required. Furthermore, 
when a plurality of electromagnetic valves are mounted on the bracket 
together, a single connector for each electromagnetic valve may cause a 
worker to make an error in wiring. On the other hand, a single connector 
for all of the electromagnetic valves demands a printed circuit board and 
the like for connecting the electromagnetic valves with leads so that a 
complicated and time-consuming operation will be required. 
SUMMARY OF THE INVENTION 
It is an object of this invention to overcome the above problems in the 
prior art by providing an electromagnetic valve which can be positioned 
close to other identical electromagnetic valves on a single bracket and in 
which wiring operations can be accurately and easily effected. 
An electromagnetic valve constructed according to this invention comprises 
yoke means having a pair of projecting elements which are provided at the 
mounting side of the valve body, one of said projecting elements having a 
pawl for insertion into an aperture of a mounting bracket while the other 
projecting element has an outward end which is inwardly bent substantially 
at a right angle and which has a threaded opening formed therein. 
Therefore, a bolt-tightening operation is effected only at the underside 
of the electromagnetic valve rather than the lateral side thereof so that 
a plurality of such electromagnetic valves may be mounted together on the 
bracket close to one another. Moreover, the electromagnetic valve of this 
invention comprises terminals which are provided to protrude outwardly 
from the valve body. These terminals can be soldered directly with the 
leads so that a single connector may be used to reduce errors in wiring 
and in the number of parts. 
This invention will be now described in more detail in connection with the 
accompaying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to FIG. 1, the prior art electromagnetic valve shown therein 
comprises a yoke provided at the mounting side thereof, the yoke including 
a pair of projecting elements 22, 22A. One of these projecting elements 
22A has its end face engaging a bracket 20A which is mounted on a machine 
frame 19 by means of screws 23. The other projecting element 22 is 
outwardly bent substantially at a right angle. This bent portion has an 
opening (not shown) for receiving bolts 21A which are tightened to the 
bracket 20A by means of nuts 21. It is apparent in such a structure that a 
substantially large space 24 must be left between the adjacent 
electromagnetic valves 20 on the bracket 20a. 
Referring to FIGS. 2 and 3, an electromagnetic valve 20B comprises a bobbin 
2a formed integrally with a plate 1, a housing 2b covering the bobbin 2a, 
a spring 3, a plunger 4 and a stator core 5, all arranged in a well known 
manner. Therefore, these parts will not be further described herein. 
In accordance with this invention, the electromagnetic valve 20B comprises 
yoke means which is provided at the mounting side of the valve body. The 
yoke means includes a pair of projecting elements 6, 6A which protrude 
outwardly therefrom. Each of the projecting elements is of a unique 
configuration. Namely, one of the projecting element 6 has at its outward 
end a small pawl 13 which is bent outwardly therefrom while the other 
projecting element 6A has an outward end portion which is inwardly bent 
substantially at a right angle and which has a threaded aperture 14 formed 
therein. 
FIG. 4 shows a bracket 7 on which the electromagnetic valve 20B of this 
invention can be mounted. The bracket 7 includes circular openings 8 and 
rectangular openings 9 formed therein such that one circular opening 8 and 
one rectangular opening 9 are disposed as a pair. The bracket 7 shown in 
FIG. 4 has three pairs of openings 8 and 9 for mounting three 
electromagnetic valves 20B on the bracket together. Each of circular 
openings 8 is adapted to be aligned with the threaded aperture 14 of the 
projecting element 6A when the electromagnetic valve 20B is mounted on the 
bracket 7. Each of the rectangular openings 9 is adapted to be engaged by 
the pawl 13 of the projecting element 6 when the electromagnetic valve 20B 
is similarly mounted on the bracket 7. It is therefore apparent that each 
pair of openings 8, 9 are spaced from each other a distance which 
corresponds to the spacing between the threaded aperture 14 of the 
projecting element 6A and the pawl 13 of the projecting element 6. Thus, 
as shown in FIG. 5, each electromagnetic valve 20B can be firmly mounted 
on the bracket 7 by engaging the pawl 13 of the projecting element 6 
within the rectangular opening 9 of the bracket 7 and aligning the 
threaded aperture 14 of the projecting element 6A with the circular 
opening 8 of the bracket and tightening the projecting element 6A to the 
bracket 7 by means of a screw 15. By comparing FIG. 5 with FIG. 1, it can 
be appreciated that the electromagnetic valves 20B can be disposed closer 
to one another than the prior art electromagnetic valves 20. 
In accordance with this invention, the electromagnetic valve 20B further 
comprises a pair of terminals 10 which protrude outwardly from the bobbin 
2a thereof as shown in FIGS. 2 and 3. These terminals 10 are connected 
with a coil (not shown) within the housing 2b and are soldered to leads 
11. 
FIG. 6 illustrates an end arrangement for wiring three electromagnetic 
valves in which a lead 11A for connecting the valves to the plus side of a 
power source (not shown) is stripped at three positions that correspond to 
the plus terminals of the electromagnetic valves 20B. These stripped 
portions of the lead 11A are soldered with the respective plus terminals 
10 of the electromagnetic valves. A lead 11B is used to connect the minus 
terminals 10 of the electromagnetic valves 20B with the minus side of the 
power source. If the three electromagnetic valves are actuated 
simultaneously under a single signal, the lead 11B is used to connect the 
minus terminals of the electromagnetic valves with one another 
simultaneously. On the other hand, if the electromagnetic valves are 
desired to be actuated separately, three identical leads 11B are used to 
separately connect the respective minus terminals with the minus side of 
the power source. Thus, a single connector can be used to wire the 
electromagnetic valves. Moreover, as shown in FIG. 5, the above end 
arrangement can be covered by a casing 12 which is fitted over the 
housings 2b of the electromagnetic valves and may be made of any suitable 
rubber or other material. The casing 12 may be filled with any suitable 
synthetic resin, such as epoxy resins, for providing water-proof and 
impact-proof properties. 
While the preferred embodiment of this invention has been described with 
reference to the accompanying drawings, it is to be understood that many 
modifications and changes can be effected by those skilled in the art 
without departing from the spirit and scope of the invention which will be 
defined in appended claims.